const now = (typeof process !== 'undefined' && process.hrtime)
    ? () => {
        const t = process.hrtime();
        return t[0] * 1e3 + t[1] / 1e6;
    }
    : () => self.performance.now();
function collapse_timings(timings) {
    const result = {};
    timings.forEach(timing => {
        result[timing.label] = Object.assign({
            total: timing.end - timing.start
        }, timing.children && collapse_timings(timing.children));
    });
    return result;
}
class Stats {
    constructor() {
        this.start_time = now();
        this.stack = [];
        this.current_children = this.timings = [];
    }
    start(label) {
        const timing = {
            label,
            start: now(),
            end: null,
            children: []
        };
        this.current_children.push(timing);
        this.stack.push(timing);
        this.current_timing = timing;
        this.current_children = timing.children;
    }
    stop(label) {
        if (label !== this.current_timing.label) {
            throw new Error(`Mismatched timing labels (expected ${this.current_timing.label}, got ${label})`);
        }
        this.current_timing.end = now();
        this.stack.pop();
        this.current_timing = this.stack[this.stack.length - 1];
        this.current_children = this.current_timing ? this.current_timing.children : this.timings;
    }
    render() {
        const timings = Object.assign({
            total: now() - this.start_time
        }, collapse_timings(this.timings));
        return {
            timings
        };
    }
}

// Reserved word lists for various dialects of the language

var reservedWords = {
  3: "abstract boolean byte char class double enum export extends final float goto implements import int interface long native package private protected public short static super synchronized throws transient volatile",
  5: "class enum extends super const export import",
  6: "enum",
  strict: "implements interface let package private protected public static yield",
  strictBind: "eval arguments"
};

// And the keywords

var ecma5AndLessKeywords = "break case catch continue debugger default do else finally for function if return switch throw try var while with null true false instanceof typeof void delete new in this";

var keywords = {
  5: ecma5AndLessKeywords,
  "5module": ecma5AndLessKeywords + " export import",
  6: ecma5AndLessKeywords + " const class extends export import super"
};

var keywordRelationalOperator = /^in(stanceof)?$/;

// ## Character categories

// Big ugly regular expressions that match characters in the
// whitespace, identifier, and identifier-start categories. These
// are only applied when a character is found to actually have a
// code point above 128.
// Generated by `bin/generate-identifier-regex.js`.
var nonASCIIidentifierStartChars = "\xaa\xb5\xba\xc0-\xd6\xd8-\xf6\xf8-\u02c1\u02c6-\u02d1\u02e0-\u02e4\u02ec\u02ee\u0370-\u0374\u0376\u0377\u037a-\u037d\u037f\u0386\u0388-\u038a\u038c\u038e-\u03a1\u03a3-\u03f5\u03f7-\u0481\u048a-\u052f\u0531-\u0556\u0559\u0560-\u0588\u05d0-\u05ea\u05ef-\u05f2\u0620-\u064a\u066e\u066f\u0671-\u06d3\u06d5\u06e5\u06e6\u06ee\u06ef\u06fa-\u06fc\u06ff\u0710\u0712-\u072f\u074d-\u07a5\u07b1\u07ca-\u07ea\u07f4\u07f5\u07fa\u0800-\u0815\u081a\u0824\u0828\u0840-\u0858\u0860-\u086a\u08a0-\u08b4\u08b6-\u08c7\u0904-\u0939\u093d\u0950\u0958-\u0961\u0971-\u0980\u0985-\u098c\u098f\u0990\u0993-\u09a8\u09aa-\u09b0\u09b2\u09b6-\u09b9\u09bd\u09ce\u09dc\u09dd\u09df-\u09e1\u09f0\u09f1\u09fc\u0a05-\u0a0a\u0a0f\u0a10\u0a13-\u0a28\u0a2a-\u0a30\u0a32\u0a33\u0a35\u0a36\u0a38\u0a39\u0a59-\u0a5c\u0a5e\u0a72-\u0a74\u0a85-\u0a8d\u0a8f-\u0a91\u0a93-\u0aa8\u0aaa-\u0ab0\u0ab2\u0ab3\u0ab5-\u0ab9\u0abd\u0ad0\u0ae0\u0ae1\u0af9\u0b05-\u0b0c\u0b0f\u0b10\u0b13-\u0b28\u0b2a-\u0b30\u0b32\u0b33\u0b35-\u0b39\u0b3d\u0b5c\u0b5d\u0b5f-\u0b61\u0b71\u0b83\u0b85-\u0b8a\u0b8e-\u0b90\u0b92-\u0b95\u0b99\u0b9a\u0b9c\u0b9e\u0b9f\u0ba3\u0ba4\u0ba8-\u0baa\u0bae-\u0bb9\u0bd0\u0c05-\u0c0c\u0c0e-\u0c10\u0c12-\u0c28\u0c2a-\u0c39\u0c3d\u0c58-\u0c5a\u0c60\u0c61\u0c80\u0c85-\u0c8c\u0c8e-\u0c90\u0c92-\u0ca8\u0caa-\u0cb3\u0cb5-\u0cb9\u0cbd\u0cde\u0ce0\u0ce1\u0cf1\u0cf2\u0d04-\u0d0c\u0d0e-\u0d10\u0d12-\u0d3a\u0d3d\u0d4e\u0d54-\u0d56\u0d5f-\u0d61\u0d7a-\u0d7f\u0d85-\u0d96\u0d9a-\u0db1\u0db3-\u0dbb\u0dbd\u0dc0-\u0dc6\u0e01-\u0e30\u0e32\u0e33\u0e40-\u0e46\u0e81\u0e82\u0e84\u0e86-\u0e8a\u0e8c-\u0ea3\u0ea5\u0ea7-\u0eb0\u0eb2\u0eb3\u0ebd\u0ec0-\u0ec4\u0ec6\u0edc-\u0edf\u0f00\u0f40-\u0f47\u0f49-\u0f6c\u0f88-\u0f8c\u1000-\u102a\u103f\u1050-\u1055\u105a-\u105d\u1061\u1065\u1066\u106e-\u1070\u1075-\u1081\u108e\u10a0-\u10c5\u10c7\u10cd\u10d0-\u10fa\u10fc-\u1248\u124a-\u124d\u1250-\u1256\u1258\u125a-\u125d\u1260-\u1288\u128a-\u128d\u1290-\u12b0\u12b2-\u12b5\u12b8-\u12be\u12c0\u12c2-\u12c5\u12c8-\u12d6\u12d8-\u1310\u1312-\u1315\u1318-\u135a\u1380-\u138f\u13a0-\u13f5\u13f8-\u13fd\u1401-\u166c\u166f-\u167f\u1681-\u169a\u16a0-\u16ea\u16ee-\u16f8\u1700-\u170c\u170e-\u1711\u1720-\u1731\u1740-\u1751\u1760-\u176c\u176e-\u1770\u1780-\u17b3\u17d7\u17dc\u1820-\u1878\u1880-\u18a8\u18aa\u18b0-\u18f5\u1900-\u191e\u1950-\u196d\u1970-\u1974\u1980-\u19ab\u19b0-\u19c9\u1a00-\u1a16\u1a20-\u1a54\u1aa7\u1b05-\u1b33\u1b45-\u1b4b\u1b83-\u1ba0\u1bae\u1baf\u1bba-\u1be5\u1c00-\u1c23\u1c4d-\u1c4f\u1c5a-\u1c7d\u1c80-\u1c88\u1c90-\u1cba\u1cbd-\u1cbf\u1ce9-\u1cec\u1cee-\u1cf3\u1cf5\u1cf6\u1cfa\u1d00-\u1dbf\u1e00-\u1f15\u1f18-\u1f1d\u1f20-\u1f45\u1f48-\u1f4d\u1f50-\u1f57\u1f59\u1f5b\u1f5d\u1f5f-\u1f7d\u1f80-\u1fb4\u1fb6-\u1fbc\u1fbe\u1fc2-\u1fc4\u1fc6-\u1fcc\u1fd0-\u1fd3\u1fd6-\u1fdb\u1fe0-\u1fec\u1ff2-\u1ff4\u1ff6-\u1ffc\u2071\u207f\u2090-\u209c\u2102\u2107\u210a-\u2113\u2115\u2118-\u211d\u2124\u2126\u2128\u212a-\u2139\u213c-\u213f\u2145-\u2149\u214e\u2160-\u2188\u2c00-\u2c2e\u2c30-\u2c5e\u2c60-\u2ce4\u2ceb-\u2cee\u2cf2\u2cf3\u2d00-\u2d25\u2d27\u2d2d\u2d30-\u2d67\u2d6f\u2d80-\u2d96\u2da0-\u2da6\u2da8-\u2dae\u2db0-\u2db6\u2db8-\u2dbe\u2dc0-\u2dc6\u2dc8-\u2dce\u2dd0-\u2dd6\u2dd8-\u2dde\u3005-\u3007\u3021-\u3029\u3031-\u3035\u3038-\u303c\u3041-\u3096\u309b-\u309f\u30a1-\u30fa\u30fc-\u30ff\u3105-\u312f\u3131-\u318e\u31a0-\u31bf\u31f0-\u31ff\u3400-\u4dbf\u4e00-\u9ffc\ua000-\ua48c\ua4d0-\ua4fd\ua500-\ua60c\ua610-\ua61f\ua62a\ua62b\ua640-\ua66e\ua67f-\ua69d\ua6a0-\ua6ef\ua717-\ua71f\ua722-\ua788\ua78b-\ua7bf\ua7c2-\ua7ca\ua7f5-\ua801\ua803-\ua805\ua807-\ua80a\ua80c-\ua822\ua840-\ua873\ua882-\ua8b3\ua8f2-\ua8f7\ua8fb\ua8fd\ua8fe\ua90a-\ua925\ua930-\ua946\ua960-\ua97c\ua984-\ua9b2\ua9cf\ua9e0-\ua9e4\ua9e6-\ua9ef\ua9fa-\ua9fe\uaa00-\uaa28\uaa40-\uaa42\uaa44-\uaa4b\uaa60-\uaa76\uaa7a\uaa7e-\uaaaf\uaab1\uaab5\uaab6\uaab9-\uaabd\uaac0\uaac2\uaadb-\uaadd\uaae0-\uaaea\uaaf2-\uaaf4\uab01-\uab06\uab09-\uab0e\uab11-\uab16\uab20-\uab26\uab28-\uab2e\uab30-\uab5a\uab5c-\uab69\uab70-\uabe2\uac00-\ud7a3\ud7b0-\ud7c6\ud7cb-\ud7fb\uf900-\ufa6d\ufa70-\ufad9\ufb00-\ufb06\ufb13-\ufb17\ufb1d\ufb1f-\ufb28\ufb2a-\ufb36\ufb38-\ufb3c\ufb3e\ufb40\ufb41\ufb43\ufb44\ufb46-\ufbb1\ufbd3-\ufd3d\ufd50-\ufd8f\ufd92-\ufdc7\ufdf0-\ufdfb\ufe70-\ufe74\ufe76-\ufefc\uff21-\uff3a\uff41-\uff5a\uff66-\uffbe\uffc2-\uffc7\uffca-\uffcf\uffd2-\uffd7\uffda-\uffdc";
var nonASCIIidentifierChars = "\u200c\u200d\xb7\u0300-\u036f\u0387\u0483-\u0487\u0591-\u05bd\u05bf\u05c1\u05c2\u05c4\u05c5\u05c7\u0610-\u061a\u064b-\u0669\u0670\u06d6-\u06dc\u06df-\u06e4\u06e7\u06e8\u06ea-\u06ed\u06f0-\u06f9\u0711\u0730-\u074a\u07a6-\u07b0\u07c0-\u07c9\u07eb-\u07f3\u07fd\u0816-\u0819\u081b-\u0823\u0825-\u0827\u0829-\u082d\u0859-\u085b\u08d3-\u08e1\u08e3-\u0903\u093a-\u093c\u093e-\u094f\u0951-\u0957\u0962\u0963\u0966-\u096f\u0981-\u0983\u09bc\u09be-\u09c4\u09c7\u09c8\u09cb-\u09cd\u09d7\u09e2\u09e3\u09e6-\u09ef\u09fe\u0a01-\u0a03\u0a3c\u0a3e-\u0a42\u0a47\u0a48\u0a4b-\u0a4d\u0a51\u0a66-\u0a71\u0a75\u0a81-\u0a83\u0abc\u0abe-\u0ac5\u0ac7-\u0ac9\u0acb-\u0acd\u0ae2\u0ae3\u0ae6-\u0aef\u0afa-\u0aff\u0b01-\u0b03\u0b3c\u0b3e-\u0b44\u0b47\u0b48\u0b4b-\u0b4d\u0b55-\u0b57\u0b62\u0b63\u0b66-\u0b6f\u0b82\u0bbe-\u0bc2\u0bc6-\u0bc8\u0bca-\u0bcd\u0bd7\u0be6-\u0bef\u0c00-\u0c04\u0c3e-\u0c44\u0c46-\u0c48\u0c4a-\u0c4d\u0c55\u0c56\u0c62\u0c63\u0c66-\u0c6f\u0c81-\u0c83\u0cbc\u0cbe-\u0cc4\u0cc6-\u0cc8\u0cca-\u0ccd\u0cd5\u0cd6\u0ce2\u0ce3\u0ce6-\u0cef\u0d00-\u0d03\u0d3b\u0d3c\u0d3e-\u0d44\u0d46-\u0d48\u0d4a-\u0d4d\u0d57\u0d62\u0d63\u0d66-\u0d6f\u0d81-\u0d83\u0dca\u0dcf-\u0dd4\u0dd6\u0dd8-\u0ddf\u0de6-\u0def\u0df2\u0df3\u0e31\u0e34-\u0e3a\u0e47-\u0e4e\u0e50-\u0e59\u0eb1\u0eb4-\u0ebc\u0ec8-\u0ecd\u0ed0-\u0ed9\u0f18\u0f19\u0f20-\u0f29\u0f35\u0f37\u0f39\u0f3e\u0f3f\u0f71-\u0f84\u0f86\u0f87\u0f8d-\u0f97\u0f99-\u0fbc\u0fc6\u102b-\u103e\u1040-\u1049\u1056-\u1059\u105e-\u1060\u1062-\u1064\u1067-\u106d\u1071-\u1074\u1082-\u108d\u108f-\u109d\u135d-\u135f\u1369-\u1371\u1712-\u1714\u1732-\u1734\u1752\u1753\u1772\u1773\u17b4-\u17d3\u17dd\u17e0-\u17e9\u180b-\u180d\u1810-\u1819\u18a9\u1920-\u192b\u1930-\u193b\u1946-\u194f\u19d0-\u19da\u1a17-\u1a1b\u1a55-\u1a5e\u1a60-\u1a7c\u1a7f-\u1a89\u1a90-\u1a99\u1ab0-\u1abd\u1abf\u1ac0\u1b00-\u1b04\u1b34-\u1b44\u1b50-\u1b59\u1b6b-\u1b73\u1b80-\u1b82\u1ba1-\u1bad\u1bb0-\u1bb9\u1be6-\u1bf3\u1c24-\u1c37\u1c40-\u1c49\u1c50-\u1c59\u1cd0-\u1cd2\u1cd4-\u1ce8\u1ced\u1cf4\u1cf7-\u1cf9\u1dc0-\u1df9\u1dfb-\u1dff\u203f\u2040\u2054\u20d0-\u20dc\u20e1\u20e5-\u20f0\u2cef-\u2cf1\u2d7f\u2de0-\u2dff\u302a-\u302f\u3099\u309a\ua620-\ua629\ua66f\ua674-\ua67d\ua69e\ua69f\ua6f0\ua6f1\ua802\ua806\ua80b\ua823-\ua827\ua82c\ua880\ua881\ua8b4-\ua8c5\ua8d0-\ua8d9\ua8e0-\ua8f1\ua8ff-\ua909\ua926-\ua92d\ua947-\ua953\ua980-\ua983\ua9b3-\ua9c0\ua9d0-\ua9d9\ua9e5\ua9f0-\ua9f9\uaa29-\uaa36\uaa43\uaa4c\uaa4d\uaa50-\uaa59\uaa7b-\uaa7d\uaab0\uaab2-\uaab4\uaab7\uaab8\uaabe\uaabf\uaac1\uaaeb-\uaaef\uaaf5\uaaf6\uabe3-\uabea\uabec\uabed\uabf0-\uabf9\ufb1e\ufe00-\ufe0f\ufe20-\ufe2f\ufe33\ufe34\ufe4d-\ufe4f\uff10-\uff19\uff3f";

var nonASCIIidentifierStart = new RegExp("[" + nonASCIIidentifierStartChars + "]");
var nonASCIIidentifier = new RegExp("[" + nonASCIIidentifierStartChars + nonASCIIidentifierChars + "]");

nonASCIIidentifierStartChars = nonASCIIidentifierChars = null;

// These are a run-length and offset encoded representation of the
// >0xffff code points that are a valid part of identifiers. The
// offset starts at 0x10000, and each pair of numbers represents an
// offset to the next range, and then a size of the range. They were
// generated by bin/generate-identifier-regex.js

// eslint-disable-next-line comma-spacing
var astralIdentifierStartCodes = [0,11,2,25,2,18,2,1,2,14,3,13,35,122,70,52,268,28,4,48,48,31,14,29,6,37,11,29,3,35,5,7,2,4,43,157,19,35,5,35,5,39,9,51,157,310,10,21,11,7,153,5,3,0,2,43,2,1,4,0,3,22,11,22,10,30,66,18,2,1,11,21,11,25,71,55,7,1,65,0,16,3,2,2,2,28,43,28,4,28,36,7,2,27,28,53,11,21,11,18,14,17,111,72,56,50,14,50,14,35,349,41,7,1,79,28,11,0,9,21,107,20,28,22,13,52,76,44,33,24,27,35,30,0,3,0,9,34,4,0,13,47,15,3,22,0,2,0,36,17,2,24,85,6,2,0,2,3,2,14,2,9,8,46,39,7,3,1,3,21,2,6,2,1,2,4,4,0,19,0,13,4,159,52,19,3,21,2,31,47,21,1,2,0,185,46,42,3,37,47,21,0,60,42,14,0,72,26,230,43,117,63,32,7,3,0,3,7,2,1,2,23,16,0,2,0,95,7,3,38,17,0,2,0,29,0,11,39,8,0,22,0,12,45,20,0,35,56,264,8,2,36,18,0,50,29,113,6,2,1,2,37,22,0,26,5,2,1,2,31,15,0,328,18,190,0,80,921,103,110,18,195,2749,1070,4050,582,8634,568,8,30,114,29,19,47,17,3,32,20,6,18,689,63,129,74,6,0,67,12,65,1,2,0,29,6135,9,1237,43,8,8952,286,50,2,18,3,9,395,2309,106,6,12,4,8,8,9,5991,84,2,70,2,1,3,0,3,1,3,3,2,11,2,0,2,6,2,64,2,3,3,7,2,6,2,27,2,3,2,4,2,0,4,6,2,339,3,24,2,24,2,30,2,24,2,30,2,24,2,30,2,24,2,30,2,24,2,7,2357,44,11,6,17,0,370,43,1301,196,60,67,8,0,1205,3,2,26,2,1,2,0,3,0,2,9,2,3,2,0,2,0,7,0,5,0,2,0,2,0,2,2,2,1,2,0,3,0,2,0,2,0,2,0,2,0,2,1,2,0,3,3,2,6,2,3,2,3,2,0,2,9,2,16,6,2,2,4,2,16,4421,42717,35,4148,12,221,3,5761,15,7472,3104,541,1507,4938];

// eslint-disable-next-line comma-spacing
var astralIdentifierCodes = [509,0,227,0,150,4,294,9,1368,2,2,1,6,3,41,2,5,0,166,1,574,3,9,9,370,1,154,10,176,2,54,14,32,9,16,3,46,10,54,9,7,2,37,13,2,9,6,1,45,0,13,2,49,13,9,3,2,11,83,11,7,0,161,11,6,9,7,3,56,1,2,6,3,1,3,2,10,0,11,1,3,6,4,4,193,17,10,9,5,0,82,19,13,9,214,6,3,8,28,1,83,16,16,9,82,12,9,9,84,14,5,9,243,14,166,9,71,5,2,1,3,3,2,0,2,1,13,9,120,6,3,6,4,0,29,9,41,6,2,3,9,0,10,10,47,15,406,7,2,7,17,9,57,21,2,13,123,5,4,0,2,1,2,6,2,0,9,9,49,4,2,1,2,4,9,9,330,3,19306,9,135,4,60,6,26,9,1014,0,2,54,8,3,82,0,12,1,19628,1,5319,4,4,5,9,7,3,6,31,3,149,2,1418,49,513,54,5,49,9,0,15,0,23,4,2,14,1361,6,2,16,3,6,2,1,2,4,262,6,10,9,419,13,1495,6,110,6,6,9,4759,9,787719,239];

// This has a complexity linear to the value of the code. The
// assumption is that looking up astral identifier characters is
// rare.
function isInAstralSet(code, set) {
  var pos = 0x10000;
  for (var i = 0; i < set.length; i += 2) {
    pos += set[i];
    if (pos > code) { return false }
    pos += set[i + 1];
    if (pos >= code) { return true }
  }
}

// Test whether a given character code starts an identifier.

function isIdentifierStart(code, astral) {
  if (code < 65) { return code === 36 }
  if (code < 91) { return true }
  if (code < 97) { return code === 95 }
  if (code < 123) { return true }
  if (code <= 0xffff) { return code >= 0xaa && nonASCIIidentifierStart.test(String.fromCharCode(code)) }
  if (astral === false) { return false }
  return isInAstralSet(code, astralIdentifierStartCodes)
}

// Test whether a given character is part of an identifier.

function isIdentifierChar(code, astral) {
  if (code < 48) { return code === 36 }
  if (code < 58) { return true }
  if (code < 65) { return false }
  if (code < 91) { return true }
  if (code < 97) { return code === 95 }
  if (code < 123) { return true }
  if (code <= 0xffff) { return code >= 0xaa && nonASCIIidentifier.test(String.fromCharCode(code)) }
  if (astral === false) { return false }
  return isInAstralSet(code, astralIdentifierStartCodes) || isInAstralSet(code, astralIdentifierCodes)
}

// ## Token types

// The assignment of fine-grained, information-carrying type objects
// allows the tokenizer to store the information it has about a
// token in a way that is very cheap for the parser to look up.

// All token type variables start with an underscore, to make them
// easy to recognize.

// The `beforeExpr` property is used to disambiguate between regular
// expressions and divisions. It is set on all token types that can
// be followed by an expression (thus, a slash after them would be a
// regular expression).
//
// The `startsExpr` property is used to check if the token ends a
// `yield` expression. It is set on all token types that either can
// directly start an expression (like a quotation mark) or can
// continue an expression (like the body of a string).
//
// `isLoop` marks a keyword as starting a loop, which is important
// to know when parsing a label, in order to allow or disallow
// continue jumps to that label.

var TokenType = function TokenType(label, conf) {
  if ( conf === void 0 ) conf = {};

  this.label = label;
  this.keyword = conf.keyword;
  this.beforeExpr = !!conf.beforeExpr;
  this.startsExpr = !!conf.startsExpr;
  this.isLoop = !!conf.isLoop;
  this.isAssign = !!conf.isAssign;
  this.prefix = !!conf.prefix;
  this.postfix = !!conf.postfix;
  this.binop = conf.binop || null;
  this.updateContext = null;
};

function binop(name, prec) {
  return new TokenType(name, {beforeExpr: true, binop: prec})
}
var beforeExpr = {beforeExpr: true}, startsExpr = {startsExpr: true};

// Map keyword names to token types.

var keywords$1 = {};

// Succinct definitions of keyword token types
function kw(name, options) {
  if ( options === void 0 ) options = {};

  options.keyword = name;
  return keywords$1[name] = new TokenType(name, options)
}

var types = {
  num: new TokenType("num", startsExpr),
  regexp: new TokenType("regexp", startsExpr),
  string: new TokenType("string", startsExpr),
  name: new TokenType("name", startsExpr),
  eof: new TokenType("eof"),

  // Punctuation token types.
  bracketL: new TokenType("[", {beforeExpr: true, startsExpr: true}),
  bracketR: new TokenType("]"),
  braceL: new TokenType("{", {beforeExpr: true, startsExpr: true}),
  braceR: new TokenType("}"),
  parenL: new TokenType("(", {beforeExpr: true, startsExpr: true}),
  parenR: new TokenType(")"),
  comma: new TokenType(",", beforeExpr),
  semi: new TokenType(";", beforeExpr),
  colon: new TokenType(":", beforeExpr),
  dot: new TokenType("."),
  question: new TokenType("?", beforeExpr),
  questionDot: new TokenType("?."),
  arrow: new TokenType("=>", beforeExpr),
  template: new TokenType("template"),
  invalidTemplate: new TokenType("invalidTemplate"),
  ellipsis: new TokenType("...", beforeExpr),
  backQuote: new TokenType("`", startsExpr),
  dollarBraceL: new TokenType("${", {beforeExpr: true, startsExpr: true}),

  // Operators. These carry several kinds of properties to help the
  // parser use them properly (the presence of these properties is
  // what categorizes them as operators).
  //
  // `binop`, when present, specifies that this operator is a binary
  // operator, and will refer to its precedence.
  //
  // `prefix` and `postfix` mark the operator as a prefix or postfix
  // unary operator.
  //
  // `isAssign` marks all of `=`, `+=`, `-=` etcetera, which act as
  // binary operators with a very low precedence, that should result
  // in AssignmentExpression nodes.

  eq: new TokenType("=", {beforeExpr: true, isAssign: true}),
  assign: new TokenType("_=", {beforeExpr: true, isAssign: true}),
  incDec: new TokenType("++/--", {prefix: true, postfix: true, startsExpr: true}),
  prefix: new TokenType("!/~", {beforeExpr: true, prefix: true, startsExpr: true}),
  logicalOR: binop("||", 1),
  logicalAND: binop("&&", 2),
  bitwiseOR: binop("|", 3),
  bitwiseXOR: binop("^", 4),
  bitwiseAND: binop("&", 5),
  equality: binop("==/!=/===/!==", 6),
  relational: binop("</>/<=/>=", 7),
  bitShift: binop("<</>>/>>>", 8),
  plusMin: new TokenType("+/-", {beforeExpr: true, binop: 9, prefix: true, startsExpr: true}),
  modulo: binop("%", 10),
  star: binop("*", 10),
  slash: binop("/", 10),
  starstar: new TokenType("**", {beforeExpr: true}),
  coalesce: binop("??", 1),

  // Keyword token types.
  _break: kw("break"),
  _case: kw("case", beforeExpr),
  _catch: kw("catch"),
  _continue: kw("continue"),
  _debugger: kw("debugger"),
  _default: kw("default", beforeExpr),
  _do: kw("do", {isLoop: true, beforeExpr: true}),
  _else: kw("else", beforeExpr),
  _finally: kw("finally"),
  _for: kw("for", {isLoop: true}),
  _function: kw("function", startsExpr),
  _if: kw("if"),
  _return: kw("return", beforeExpr),
  _switch: kw("switch"),
  _throw: kw("throw", beforeExpr),
  _try: kw("try"),
  _var: kw("var"),
  _const: kw("const"),
  _while: kw("while", {isLoop: true}),
  _with: kw("with"),
  _new: kw("new", {beforeExpr: true, startsExpr: true}),
  _this: kw("this", startsExpr),
  _super: kw("super", startsExpr),
  _class: kw("class", startsExpr),
  _extends: kw("extends", beforeExpr),
  _export: kw("export"),
  _import: kw("import", startsExpr),
  _null: kw("null", startsExpr),
  _true: kw("true", startsExpr),
  _false: kw("false", startsExpr),
  _in: kw("in", {beforeExpr: true, binop: 7}),
  _instanceof: kw("instanceof", {beforeExpr: true, binop: 7}),
  _typeof: kw("typeof", {beforeExpr: true, prefix: true, startsExpr: true}),
  _void: kw("void", {beforeExpr: true, prefix: true, startsExpr: true}),
  _delete: kw("delete", {beforeExpr: true, prefix: true, startsExpr: true})
};

// Matches a whole line break (where CRLF is considered a single
// line break). Used to count lines.

var lineBreak = /\r\n?|\n|\u2028|\u2029/;
var lineBreakG = new RegExp(lineBreak.source, "g");

function isNewLine(code, ecma2019String) {
  return code === 10 || code === 13 || (!ecma2019String && (code === 0x2028 || code === 0x2029))
}

var nonASCIIwhitespace = /[\u1680\u2000-\u200a\u202f\u205f\u3000\ufeff]/;

var skipWhiteSpace = /(?:\s|\/\/.*|\/\*[^]*?\*\/)*/g;

var ref = Object.prototype;
var hasOwnProperty = ref.hasOwnProperty;
var toString = ref.toString;

// Checks if an object has a property.

function has(obj, propName) {
  return hasOwnProperty.call(obj, propName)
}

var isArray = Array.isArray || (function (obj) { return (
  toString.call(obj) === "[object Array]"
); });

function wordsRegexp(words) {
  return new RegExp("^(?:" + words.replace(/ /g, "|") + ")$")
}

// These are used when `options.locations` is on, for the
// `startLoc` and `endLoc` properties.

var Position = function Position(line, col) {
  this.line = line;
  this.column = col;
};

Position.prototype.offset = function offset (n) {
  return new Position(this.line, this.column + n)
};

var SourceLocation = function SourceLocation(p, start, end) {
  this.start = start;
  this.end = end;
  if (p.sourceFile !== null) { this.source = p.sourceFile; }
};

// The `getLineInfo` function is mostly useful when the
// `locations` option is off (for performance reasons) and you
// want to find the line/column position for a given character
// offset. `input` should be the code string that the offset refers
// into.

function getLineInfo(input, offset) {
  for (var line = 1, cur = 0;;) {
    lineBreakG.lastIndex = cur;
    var match = lineBreakG.exec(input);
    if (match && match.index < offset) {
      ++line;
      cur = match.index + match[0].length;
    } else {
      return new Position(line, offset - cur)
    }
  }
}

// A second optional argument can be given to further configure
// the parser process. These options are recognized:

var defaultOptions = {
  // `ecmaVersion` indicates the ECMAScript version to parse. Must be
  // either 3, 5, 6 (2015), 7 (2016), 8 (2017), 9 (2018), or 10
  // (2019). This influences support for strict mode, the set of
  // reserved words, and support for new syntax features. The default
  // is 10.
  ecmaVersion: 10,
  // `sourceType` indicates the mode the code should be parsed in.
  // Can be either `"script"` or `"module"`. This influences global
  // strict mode and parsing of `import` and `export` declarations.
  sourceType: "script",
  // `onInsertedSemicolon` can be a callback that will be called
  // when a semicolon is automatically inserted. It will be passed
  // the position of the comma as an offset, and if `locations` is
  // enabled, it is given the location as a `{line, column}` object
  // as second argument.
  onInsertedSemicolon: null,
  // `onTrailingComma` is similar to `onInsertedSemicolon`, but for
  // trailing commas.
  onTrailingComma: null,
  // By default, reserved words are only enforced if ecmaVersion >= 5.
  // Set `allowReserved` to a boolean value to explicitly turn this on
  // an off. When this option has the value "never", reserved words
  // and keywords can also not be used as property names.
  allowReserved: null,
  // When enabled, a return at the top level is not considered an
  // error.
  allowReturnOutsideFunction: false,
  // When enabled, import/export statements are not constrained to
  // appearing at the top of the program.
  allowImportExportEverywhere: false,
  // When enabled, await identifiers are allowed to appear at the top-level scope,
  // but they are still not allowed in non-async functions.
  allowAwaitOutsideFunction: false,
  // When enabled, hashbang directive in the beginning of file
  // is allowed and treated as a line comment.
  allowHashBang: false,
  // When `locations` is on, `loc` properties holding objects with
  // `start` and `end` properties in `{line, column}` form (with
  // line being 1-based and column 0-based) will be attached to the
  // nodes.
  locations: false,
  // A function can be passed as `onToken` option, which will
  // cause Acorn to call that function with object in the same
  // format as tokens returned from `tokenizer().getToken()`. Note
  // that you are not allowed to call the parser from the
  // callback—that will corrupt its internal state.
  onToken: null,
  // A function can be passed as `onComment` option, which will
  // cause Acorn to call that function with `(block, text, start,
  // end)` parameters whenever a comment is skipped. `block` is a
  // boolean indicating whether this is a block (`/* */`) comment,
  // `text` is the content of the comment, and `start` and `end` are
  // character offsets that denote the start and end of the comment.
  // When the `locations` option is on, two more parameters are
  // passed, the full `{line, column}` locations of the start and
  // end of the comments. Note that you are not allowed to call the
  // parser from the callback—that will corrupt its internal state.
  onComment: null,
  // Nodes have their start and end characters offsets recorded in
  // `start` and `end` properties (directly on the node, rather than
  // the `loc` object, which holds line/column data. To also add a
  // [semi-standardized][range] `range` property holding a `[start,
  // end]` array with the same numbers, set the `ranges` option to
  // `true`.
  //
  // [range]: https://bugzilla.mozilla.org/show_bug.cgi?id=745678
  ranges: false,
  // It is possible to parse multiple files into a single AST by
  // passing the tree produced by parsing the first file as
  // `program` option in subsequent parses. This will add the
  // toplevel forms of the parsed file to the `Program` (top) node
  // of an existing parse tree.
  program: null,
  // When `locations` is on, you can pass this to record the source
  // file in every node's `loc` object.
  sourceFile: null,
  // This value, if given, is stored in every node, whether
  // `locations` is on or off.
  directSourceFile: null,
  // When enabled, parenthesized expressions are represented by
  // (non-standard) ParenthesizedExpression nodes
  preserveParens: false
};

// Interpret and default an options object

function getOptions(opts) {
  var options = {};

  for (var opt in defaultOptions)
    { options[opt] = opts && has(opts, opt) ? opts[opt] : defaultOptions[opt]; }

  if (options.ecmaVersion >= 2015)
    { options.ecmaVersion -= 2009; }

  if (options.allowReserved == null)
    { options.allowReserved = options.ecmaVersion < 5; }

  if (isArray(options.onToken)) {
    var tokens = options.onToken;
    options.onToken = function (token) { return tokens.push(token); };
  }
  if (isArray(options.onComment))
    { options.onComment = pushComment(options, options.onComment); }

  return options
}

function pushComment(options, array) {
  return function(block, text, start, end, startLoc, endLoc) {
    var comment = {
      type: block ? "Block" : "Line",
      value: text,
      start: start,
      end: end
    };
    if (options.locations)
      { comment.loc = new SourceLocation(this, startLoc, endLoc); }
    if (options.ranges)
      { comment.range = [start, end]; }
    array.push(comment);
  }
}

// Each scope gets a bitset that may contain these flags
var
    SCOPE_TOP = 1,
    SCOPE_FUNCTION = 2,
    SCOPE_VAR = SCOPE_TOP | SCOPE_FUNCTION,
    SCOPE_ASYNC = 4,
    SCOPE_GENERATOR = 8,
    SCOPE_ARROW = 16,
    SCOPE_SIMPLE_CATCH = 32,
    SCOPE_SUPER = 64,
    SCOPE_DIRECT_SUPER = 128;

function functionFlags(async, generator) {
  return SCOPE_FUNCTION | (async ? SCOPE_ASYNC : 0) | (generator ? SCOPE_GENERATOR : 0)
}

// Used in checkLVal and declareName to determine the type of a binding
var
    BIND_NONE = 0, // Not a binding
    BIND_VAR = 1, // Var-style binding
    BIND_LEXICAL = 2, // Let- or const-style binding
    BIND_FUNCTION = 3, // Function declaration
    BIND_SIMPLE_CATCH = 4, // Simple (identifier pattern) catch binding
    BIND_OUTSIDE = 5; // Special case for function names as bound inside the function

var Parser = function Parser(options, input, startPos) {
  this.options = options = getOptions(options);
  this.sourceFile = options.sourceFile;
  this.keywords = wordsRegexp(keywords[options.ecmaVersion >= 6 ? 6 : options.sourceType === "module" ? "5module" : 5]);
  var reserved = "";
  if (options.allowReserved !== true) {
    for (var v = options.ecmaVersion;; v--)
      { if (reserved = reservedWords[v]) { break } }
    if (options.sourceType === "module") { reserved += " await"; }
  }
  this.reservedWords = wordsRegexp(reserved);
  var reservedStrict = (reserved ? reserved + " " : "") + reservedWords.strict;
  this.reservedWordsStrict = wordsRegexp(reservedStrict);
  this.reservedWordsStrictBind = wordsRegexp(reservedStrict + " " + reservedWords.strictBind);
  this.input = String(input);

  // Used to signal to callers of `readWord1` whether the word
  // contained any escape sequences. This is needed because words with
  // escape sequences must not be interpreted as keywords.
  this.containsEsc = false;

  // Set up token state

  // The current position of the tokenizer in the input.
  if (startPos) {
    this.pos = startPos;
    this.lineStart = this.input.lastIndexOf("\n", startPos - 1) + 1;
    this.curLine = this.input.slice(0, this.lineStart).split(lineBreak).length;
  } else {
    this.pos = this.lineStart = 0;
    this.curLine = 1;
  }

  // Properties of the current token:
  // Its type
  this.type = types.eof;
  // For tokens that include more information than their type, the value
  this.value = null;
  // Its start and end offset
  this.start = this.end = this.pos;
  // And, if locations are used, the {line, column} object
  // corresponding to those offsets
  this.startLoc = this.endLoc = this.curPosition();

  // Position information for the previous token
  this.lastTokEndLoc = this.lastTokStartLoc = null;
  this.lastTokStart = this.lastTokEnd = this.pos;

  // The context stack is used to superficially track syntactic
  // context to predict whether a regular expression is allowed in a
  // given position.
  this.context = this.initialContext();
  this.exprAllowed = true;

  // Figure out if it's a module code.
  this.inModule = options.sourceType === "module";
  this.strict = this.inModule || this.strictDirective(this.pos);

  // Used to signify the start of a potential arrow function
  this.potentialArrowAt = -1;

  // Positions to delayed-check that yield/await does not exist in default parameters.
  this.yieldPos = this.awaitPos = this.awaitIdentPos = 0;
  // Labels in scope.
  this.labels = [];
  // Thus-far undefined exports.
  this.undefinedExports = {};

  // If enabled, skip leading hashbang line.
  if (this.pos === 0 && options.allowHashBang && this.input.slice(0, 2) === "#!")
    { this.skipLineComment(2); }

  // Scope tracking for duplicate variable names (see scope.js)
  this.scopeStack = [];
  this.enterScope(SCOPE_TOP);

  // For RegExp validation
  this.regexpState = null;
};

var prototypeAccessors = { inFunction: { configurable: true },inGenerator: { configurable: true },inAsync: { configurable: true },allowSuper: { configurable: true },allowDirectSuper: { configurable: true },treatFunctionsAsVar: { configurable: true } };

Parser.prototype.parse = function parse () {
  var node = this.options.program || this.startNode();
  this.nextToken();
  return this.parseTopLevel(node)
};

prototypeAccessors.inFunction.get = function () { return (this.currentVarScope().flags & SCOPE_FUNCTION) > 0 };
prototypeAccessors.inGenerator.get = function () { return (this.currentVarScope().flags & SCOPE_GENERATOR) > 0 };
prototypeAccessors.inAsync.get = function () { return (this.currentVarScope().flags & SCOPE_ASYNC) > 0 };
prototypeAccessors.allowSuper.get = function () { return (this.currentThisScope().flags & SCOPE_SUPER) > 0 };
prototypeAccessors.allowDirectSuper.get = function () { return (this.currentThisScope().flags & SCOPE_DIRECT_SUPER) > 0 };
prototypeAccessors.treatFunctionsAsVar.get = function () { return this.treatFunctionsAsVarInScope(this.currentScope()) };

// Switch to a getter for 7.0.0.
Parser.prototype.inNonArrowFunction = function inNonArrowFunction () { return (this.currentThisScope().flags & SCOPE_FUNCTION) > 0 };

Parser.extend = function extend () {
    var plugins = [], len = arguments.length;
    while ( len-- ) plugins[ len ] = arguments[ len ];

  var cls = this;
  for (var i = 0; i < plugins.length; i++) { cls = plugins[i](cls); }
  return cls
};

Parser.parse = function parse (input, options) {
  return new this(options, input).parse()
};

Parser.parseExpressionAt = function parseExpressionAt (input, pos, options) {
  var parser = new this(options, input, pos);
  parser.nextToken();
  return parser.parseExpression()
};

Parser.tokenizer = function tokenizer (input, options) {
  return new this(options, input)
};

Object.defineProperties( Parser.prototype, prototypeAccessors );

var pp = Parser.prototype;

// ## Parser utilities

var literal = /^(?:'((?:\\.|[^'])*?)'|"((?:\\.|[^"])*?)")/;
pp.strictDirective = function(start) {
  for (;;) {
    // Try to find string literal.
    skipWhiteSpace.lastIndex = start;
    start += skipWhiteSpace.exec(this.input)[0].length;
    var match = literal.exec(this.input.slice(start));
    if (!match) { return false }
    if ((match[1] || match[2]) === "use strict") {
      skipWhiteSpace.lastIndex = start + match[0].length;
      var spaceAfter = skipWhiteSpace.exec(this.input), end = spaceAfter.index + spaceAfter[0].length;
      var next = this.input.charAt(end);
      return next === ";" || next === "}" ||
        (lineBreak.test(spaceAfter[0]) &&
         !(/[(`.[+\-/*%<>=,?^&]/.test(next) || next === "!" && this.input.charAt(end + 1) === "="))
    }
    start += match[0].length;

    // Skip semicolon, if any.
    skipWhiteSpace.lastIndex = start;
    start += skipWhiteSpace.exec(this.input)[0].length;
    if (this.input[start] === ";")
      { start++; }
  }
};

// Predicate that tests whether the next token is of the given
// type, and if yes, consumes it as a side effect.

pp.eat = function(type) {
  if (this.type === type) {
    this.next();
    return true
  } else {
    return false
  }
};

// Tests whether parsed token is a contextual keyword.

pp.isContextual = function(name) {
  return this.type === types.name && this.value === name && !this.containsEsc
};

// Consumes contextual keyword if possible.

pp.eatContextual = function(name) {
  if (!this.isContextual(name)) { return false }
  this.next();
  return true
};

// Asserts that following token is given contextual keyword.

pp.expectContextual = function(name) {
  if (!this.eatContextual(name)) { this.unexpected(); }
};

// Test whether a semicolon can be inserted at the current position.

pp.canInsertSemicolon = function() {
  return this.type === types.eof ||
    this.type === types.braceR ||
    lineBreak.test(this.input.slice(this.lastTokEnd, this.start))
};

pp.insertSemicolon = function() {
  if (this.canInsertSemicolon()) {
    if (this.options.onInsertedSemicolon)
      { this.options.onInsertedSemicolon(this.lastTokEnd, this.lastTokEndLoc); }
    return true
  }
};

// Consume a semicolon, or, failing that, see if we are allowed to
// pretend that there is a semicolon at this position.

pp.semicolon = function() {
  if (!this.eat(types.semi) && !this.insertSemicolon()) { this.unexpected(); }
};

pp.afterTrailingComma = function(tokType, notNext) {
  if (this.type === tokType) {
    if (this.options.onTrailingComma)
      { this.options.onTrailingComma(this.lastTokStart, this.lastTokStartLoc); }
    if (!notNext)
      { this.next(); }
    return true
  }
};

// Expect a token of a given type. If found, consume it, otherwise,
// raise an unexpected token error.

pp.expect = function(type) {
  this.eat(type) || this.unexpected();
};

// Raise an unexpected token error.

pp.unexpected = function(pos) {
  this.raise(pos != null ? pos : this.start, "Unexpected token");
};

function DestructuringErrors() {
  this.shorthandAssign =
  this.trailingComma =
  this.parenthesizedAssign =
  this.parenthesizedBind =
  this.doubleProto =
    -1;
}

pp.checkPatternErrors = function(refDestructuringErrors, isAssign) {
  if (!refDestructuringErrors) { return }
  if (refDestructuringErrors.trailingComma > -1)
    { this.raiseRecoverable(refDestructuringErrors.trailingComma, "Comma is not permitted after the rest element"); }
  var parens = isAssign ? refDestructuringErrors.parenthesizedAssign : refDestructuringErrors.parenthesizedBind;
  if (parens > -1) { this.raiseRecoverable(parens, "Parenthesized pattern"); }
};

pp.checkExpressionErrors = function(refDestructuringErrors, andThrow) {
  if (!refDestructuringErrors) { return false }
  var shorthandAssign = refDestructuringErrors.shorthandAssign;
  var doubleProto = refDestructuringErrors.doubleProto;
  if (!andThrow) { return shorthandAssign >= 0 || doubleProto >= 0 }
  if (shorthandAssign >= 0)
    { this.raise(shorthandAssign, "Shorthand property assignments are valid only in destructuring patterns"); }
  if (doubleProto >= 0)
    { this.raiseRecoverable(doubleProto, "Redefinition of __proto__ property"); }
};

pp.checkYieldAwaitInDefaultParams = function() {
  if (this.yieldPos && (!this.awaitPos || this.yieldPos < this.awaitPos))
    { this.raise(this.yieldPos, "Yield expression cannot be a default value"); }
  if (this.awaitPos)
    { this.raise(this.awaitPos, "Await expression cannot be a default value"); }
};

pp.isSimpleAssignTarget = function(expr) {
  if (expr.type === "ParenthesizedExpression")
    { return this.isSimpleAssignTarget(expr.expression) }
  return expr.type === "Identifier" || expr.type === "MemberExpression"
};

var pp$1 = Parser.prototype;

// ### Statement parsing

// Parse a program. Initializes the parser, reads any number of
// statements, and wraps them in a Program node.  Optionally takes a
// `program` argument.  If present, the statements will be appended
// to its body instead of creating a new node.

pp$1.parseTopLevel = function(node) {
  var exports = {};
  if (!node.body) { node.body = []; }
  while (this.type !== types.eof) {
    var stmt = this.parseStatement(null, true, exports);
    node.body.push(stmt);
  }
  if (this.inModule)
    { for (var i = 0, list = Object.keys(this.undefinedExports); i < list.length; i += 1)
      {
        var name = list[i];

        this.raiseRecoverable(this.undefinedExports[name].start, ("Export '" + name + "' is not defined"));
      } }
  this.adaptDirectivePrologue(node.body);
  this.next();
  node.sourceType = this.options.sourceType;
  return this.finishNode(node, "Program")
};

var loopLabel = {kind: "loop"}, switchLabel = {kind: "switch"};

pp$1.isLet = function(context) {
  if (this.options.ecmaVersion < 6 || !this.isContextual("let")) { return false }
  skipWhiteSpace.lastIndex = this.pos;
  var skip = skipWhiteSpace.exec(this.input);
  var next = this.pos + skip[0].length, nextCh = this.input.charCodeAt(next);
  // For ambiguous cases, determine if a LexicalDeclaration (or only a
  // Statement) is allowed here. If context is not empty then only a Statement
  // is allowed. However, `let [` is an explicit negative lookahead for
  // ExpressionStatement, so special-case it first.
  if (nextCh === 91) { return true } // '['
  if (context) { return false }

  if (nextCh === 123) { return true } // '{'
  if (isIdentifierStart(nextCh, true)) {
    var pos = next + 1;
    while (isIdentifierChar(this.input.charCodeAt(pos), true)) { ++pos; }
    var ident = this.input.slice(next, pos);
    if (!keywordRelationalOperator.test(ident)) { return true }
  }
  return false
};

// check 'async [no LineTerminator here] function'
// - 'async /*foo*/ function' is OK.
// - 'async /*\n*/ function' is invalid.
pp$1.isAsyncFunction = function() {
  if (this.options.ecmaVersion < 8 || !this.isContextual("async"))
    { return false }

  skipWhiteSpace.lastIndex = this.pos;
  var skip = skipWhiteSpace.exec(this.input);
  var next = this.pos + skip[0].length;
  return !lineBreak.test(this.input.slice(this.pos, next)) &&
    this.input.slice(next, next + 8) === "function" &&
    (next + 8 === this.input.length || !isIdentifierChar(this.input.charAt(next + 8)))
};

// Parse a single statement.
//
// If expecting a statement and finding a slash operator, parse a
// regular expression literal. This is to handle cases like
// `if (foo) /blah/.exec(foo)`, where looking at the previous token
// does not help.

pp$1.parseStatement = function(context, topLevel, exports) {
  var starttype = this.type, node = this.startNode(), kind;

  if (this.isLet(context)) {
    starttype = types._var;
    kind = "let";
  }

  // Most types of statements are recognized by the keyword they
  // start with. Many are trivial to parse, some require a bit of
  // complexity.

  switch (starttype) {
  case types._break: case types._continue: return this.parseBreakContinueStatement(node, starttype.keyword)
  case types._debugger: return this.parseDebuggerStatement(node)
  case types._do: return this.parseDoStatement(node)
  case types._for: return this.parseForStatement(node)
  case types._function:
    // Function as sole body of either an if statement or a labeled statement
    // works, but not when it is part of a labeled statement that is the sole
    // body of an if statement.
    if ((context && (this.strict || context !== "if" && context !== "label")) && this.options.ecmaVersion >= 6) { this.unexpected(); }
    return this.parseFunctionStatement(node, false, !context)
  case types._class:
    if (context) { this.unexpected(); }
    return this.parseClass(node, true)
  case types._if: return this.parseIfStatement(node)
  case types._return: return this.parseReturnStatement(node)
  case types._switch: return this.parseSwitchStatement(node)
  case types._throw: return this.parseThrowStatement(node)
  case types._try: return this.parseTryStatement(node)
  case types._const: case types._var:
    kind = kind || this.value;
    if (context && kind !== "var") { this.unexpected(); }
    return this.parseVarStatement(node, kind)
  case types._while: return this.parseWhileStatement(node)
  case types._with: return this.parseWithStatement(node)
  case types.braceL: return this.parseBlock(true, node)
  case types.semi: return this.parseEmptyStatement(node)
  case types._export:
  case types._import:
    if (this.options.ecmaVersion > 10 && starttype === types._import) {
      skipWhiteSpace.lastIndex = this.pos;
      var skip = skipWhiteSpace.exec(this.input);
      var next = this.pos + skip[0].length, nextCh = this.input.charCodeAt(next);
      if (nextCh === 40 || nextCh === 46) // '(' or '.'
        { return this.parseExpressionStatement(node, this.parseExpression()) }
    }

    if (!this.options.allowImportExportEverywhere) {
      if (!topLevel)
        { this.raise(this.start, "'import' and 'export' may only appear at the top level"); }
      if (!this.inModule)
        { this.raise(this.start, "'import' and 'export' may appear only with 'sourceType: module'"); }
    }
    return starttype === types._import ? this.parseImport(node) : this.parseExport(node, exports)

    // If the statement does not start with a statement keyword or a
    // brace, it's an ExpressionStatement or LabeledStatement. We
    // simply start parsing an expression, and afterwards, if the
    // next token is a colon and the expression was a simple
    // Identifier node, we switch to interpreting it as a label.
  default:
    if (this.isAsyncFunction()) {
      if (context) { this.unexpected(); }
      this.next();
      return this.parseFunctionStatement(node, true, !context)
    }

    var maybeName = this.value, expr = this.parseExpression();
    if (starttype === types.name && expr.type === "Identifier" && this.eat(types.colon))
      { return this.parseLabeledStatement(node, maybeName, expr, context) }
    else { return this.parseExpressionStatement(node, expr) }
  }
};

pp$1.parseBreakContinueStatement = function(node, keyword) {
  var isBreak = keyword === "break";
  this.next();
  if (this.eat(types.semi) || this.insertSemicolon()) { node.label = null; }
  else if (this.type !== types.name) { this.unexpected(); }
  else {
    node.label = this.parseIdent();
    this.semicolon();
  }

  // Verify that there is an actual destination to break or
  // continue to.
  var i = 0;
  for (; i < this.labels.length; ++i) {
    var lab = this.labels[i];
    if (node.label == null || lab.name === node.label.name) {
      if (lab.kind != null && (isBreak || lab.kind === "loop")) { break }
      if (node.label && isBreak) { break }
    }
  }
  if (i === this.labels.length) { this.raise(node.start, "Unsyntactic " + keyword); }
  return this.finishNode(node, isBreak ? "BreakStatement" : "ContinueStatement")
};

pp$1.parseDebuggerStatement = function(node) {
  this.next();
  this.semicolon();
  return this.finishNode(node, "DebuggerStatement")
};

pp$1.parseDoStatement = function(node) {
  this.next();
  this.labels.push(loopLabel);
  node.body = this.parseStatement("do");
  this.labels.pop();
  this.expect(types._while);
  node.test = this.parseParenExpression();
  if (this.options.ecmaVersion >= 6)
    { this.eat(types.semi); }
  else
    { this.semicolon(); }
  return this.finishNode(node, "DoWhileStatement")
};

// Disambiguating between a `for` and a `for`/`in` or `for`/`of`
// loop is non-trivial. Basically, we have to parse the init `var`
// statement or expression, disallowing the `in` operator (see
// the second parameter to `parseExpression`), and then check
// whether the next token is `in` or `of`. When there is no init
// part (semicolon immediately after the opening parenthesis), it
// is a regular `for` loop.

pp$1.parseForStatement = function(node) {
  this.next();
  var awaitAt = (this.options.ecmaVersion >= 9 && (this.inAsync || (!this.inFunction && this.options.allowAwaitOutsideFunction)) && this.eatContextual("await")) ? this.lastTokStart : -1;
  this.labels.push(loopLabel);
  this.enterScope(0);
  this.expect(types.parenL);
  if (this.type === types.semi) {
    if (awaitAt > -1) { this.unexpected(awaitAt); }
    return this.parseFor(node, null)
  }
  var isLet = this.isLet();
  if (this.type === types._var || this.type === types._const || isLet) {
    var init$1 = this.startNode(), kind = isLet ? "let" : this.value;
    this.next();
    this.parseVar(init$1, true, kind);
    this.finishNode(init$1, "VariableDeclaration");
    if ((this.type === types._in || (this.options.ecmaVersion >= 6 && this.isContextual("of"))) && init$1.declarations.length === 1) {
      if (this.options.ecmaVersion >= 9) {
        if (this.type === types._in) {
          if (awaitAt > -1) { this.unexpected(awaitAt); }
        } else { node.await = awaitAt > -1; }
      }
      return this.parseForIn(node, init$1)
    }
    if (awaitAt > -1) { this.unexpected(awaitAt); }
    return this.parseFor(node, init$1)
  }
  var refDestructuringErrors = new DestructuringErrors;
  var init = this.parseExpression(true, refDestructuringErrors);
  if (this.type === types._in || (this.options.ecmaVersion >= 6 && this.isContextual("of"))) {
    if (this.options.ecmaVersion >= 9) {
      if (this.type === types._in) {
        if (awaitAt > -1) { this.unexpected(awaitAt); }
      } else { node.await = awaitAt > -1; }
    }
    this.toAssignable(init, false, refDestructuringErrors);
    this.checkLVal(init);
    return this.parseForIn(node, init)
  } else {
    this.checkExpressionErrors(refDestructuringErrors, true);
  }
  if (awaitAt > -1) { this.unexpected(awaitAt); }
  return this.parseFor(node, init)
};

pp$1.parseFunctionStatement = function(node, isAsync, declarationPosition) {
  this.next();
  return this.parseFunction(node, FUNC_STATEMENT | (declarationPosition ? 0 : FUNC_HANGING_STATEMENT), false, isAsync)
};

pp$1.parseIfStatement = function(node) {
  this.next();
  node.test = this.parseParenExpression();
  // allow function declarations in branches, but only in non-strict mode
  node.consequent = this.parseStatement("if");
  node.alternate = this.eat(types._else) ? this.parseStatement("if") : null;
  return this.finishNode(node, "IfStatement")
};

pp$1.parseReturnStatement = function(node) {
  if (!this.inFunction && !this.options.allowReturnOutsideFunction)
    { this.raise(this.start, "'return' outside of function"); }
  this.next();

  // In `return` (and `break`/`continue`), the keywords with
  // optional arguments, we eagerly look for a semicolon or the
  // possibility to insert one.

  if (this.eat(types.semi) || this.insertSemicolon()) { node.argument = null; }
  else { node.argument = this.parseExpression(); this.semicolon(); }
  return this.finishNode(node, "ReturnStatement")
};

pp$1.parseSwitchStatement = function(node) {
  this.next();
  node.discriminant = this.parseParenExpression();
  node.cases = [];
  this.expect(types.braceL);
  this.labels.push(switchLabel);
  this.enterScope(0);

  // Statements under must be grouped (by label) in SwitchCase
  // nodes. `cur` is used to keep the node that we are currently
  // adding statements to.

  var cur;
  for (var sawDefault = false; this.type !== types.braceR;) {
    if (this.type === types._case || this.type === types._default) {
      var isCase = this.type === types._case;
      if (cur) { this.finishNode(cur, "SwitchCase"); }
      node.cases.push(cur = this.startNode());
      cur.consequent = [];
      this.next();
      if (isCase) {
        cur.test = this.parseExpression();
      } else {
        if (sawDefault) { this.raiseRecoverable(this.lastTokStart, "Multiple default clauses"); }
        sawDefault = true;
        cur.test = null;
      }
      this.expect(types.colon);
    } else {
      if (!cur) { this.unexpected(); }
      cur.consequent.push(this.parseStatement(null));
    }
  }
  this.exitScope();
  if (cur) { this.finishNode(cur, "SwitchCase"); }
  this.next(); // Closing brace
  this.labels.pop();
  return this.finishNode(node, "SwitchStatement")
};

pp$1.parseThrowStatement = function(node) {
  this.next();
  if (lineBreak.test(this.input.slice(this.lastTokEnd, this.start)))
    { this.raise(this.lastTokEnd, "Illegal newline after throw"); }
  node.argument = this.parseExpression();
  this.semicolon();
  return this.finishNode(node, "ThrowStatement")
};

// Reused empty array added for node fields that are always empty.

var empty = [];

pp$1.parseTryStatement = function(node) {
  this.next();
  node.block = this.parseBlock();
  node.handler = null;
  if (this.type === types._catch) {
    var clause = this.startNode();
    this.next();
    if (this.eat(types.parenL)) {
      clause.param = this.parseBindingAtom();
      var simple = clause.param.type === "Identifier";
      this.enterScope(simple ? SCOPE_SIMPLE_CATCH : 0);
      this.checkLVal(clause.param, simple ? BIND_SIMPLE_CATCH : BIND_LEXICAL);
      this.expect(types.parenR);
    } else {
      if (this.options.ecmaVersion < 10) { this.unexpected(); }
      clause.param = null;
      this.enterScope(0);
    }
    clause.body = this.parseBlock(false);
    this.exitScope();
    node.handler = this.finishNode(clause, "CatchClause");
  }
  node.finalizer = this.eat(types._finally) ? this.parseBlock() : null;
  if (!node.handler && !node.finalizer)
    { this.raise(node.start, "Missing catch or finally clause"); }
  return this.finishNode(node, "TryStatement")
};

pp$1.parseVarStatement = function(node, kind) {
  this.next();
  this.parseVar(node, false, kind);
  this.semicolon();
  return this.finishNode(node, "VariableDeclaration")
};

pp$1.parseWhileStatement = function(node) {
  this.next();
  node.test = this.parseParenExpression();
  this.labels.push(loopLabel);
  node.body = this.parseStatement("while");
  this.labels.pop();
  return this.finishNode(node, "WhileStatement")
};

pp$1.parseWithStatement = function(node) {
  if (this.strict) { this.raise(this.start, "'with' in strict mode"); }
  this.next();
  node.object = this.parseParenExpression();
  node.body = this.parseStatement("with");
  return this.finishNode(node, "WithStatement")
};

pp$1.parseEmptyStatement = function(node) {
  this.next();
  return this.finishNode(node, "EmptyStatement")
};

pp$1.parseLabeledStatement = function(node, maybeName, expr, context) {
  for (var i$1 = 0, list = this.labels; i$1 < list.length; i$1 += 1)
    {
    var label = list[i$1];

    if (label.name === maybeName)
      { this.raise(expr.start, "Label '" + maybeName + "' is already declared");
  } }
  var kind = this.type.isLoop ? "loop" : this.type === types._switch ? "switch" : null;
  for (var i = this.labels.length - 1; i >= 0; i--) {
    var label$1 = this.labels[i];
    if (label$1.statementStart === node.start) {
      // Update information about previous labels on this node
      label$1.statementStart = this.start;
      label$1.kind = kind;
    } else { break }
  }
  this.labels.push({name: maybeName, kind: kind, statementStart: this.start});
  node.body = this.parseStatement(context ? context.indexOf("label") === -1 ? context + "label" : context : "label");
  this.labels.pop();
  node.label = expr;
  return this.finishNode(node, "LabeledStatement")
};

pp$1.parseExpressionStatement = function(node, expr) {
  node.expression = expr;
  this.semicolon();
  return this.finishNode(node, "ExpressionStatement")
};

// Parse a semicolon-enclosed block of statements, handling `"use
// strict"` declarations when `allowStrict` is true (used for
// function bodies).

pp$1.parseBlock = function(createNewLexicalScope, node, exitStrict) {
  if ( createNewLexicalScope === void 0 ) createNewLexicalScope = true;
  if ( node === void 0 ) node = this.startNode();

  node.body = [];
  this.expect(types.braceL);
  if (createNewLexicalScope) { this.enterScope(0); }
  while (this.type !== types.braceR) {
    var stmt = this.parseStatement(null);
    node.body.push(stmt);
  }
  if (exitStrict) { this.strict = false; }
  this.next();
  if (createNewLexicalScope) { this.exitScope(); }
  return this.finishNode(node, "BlockStatement")
};

// Parse a regular `for` loop. The disambiguation code in
// `parseStatement` will already have parsed the init statement or
// expression.

pp$1.parseFor = function(node, init) {
  node.init = init;
  this.expect(types.semi);
  node.test = this.type === types.semi ? null : this.parseExpression();
  this.expect(types.semi);
  node.update = this.type === types.parenR ? null : this.parseExpression();
  this.expect(types.parenR);
  node.body = this.parseStatement("for");
  this.exitScope();
  this.labels.pop();
  return this.finishNode(node, "ForStatement")
};

// Parse a `for`/`in` and `for`/`of` loop, which are almost
// same from parser's perspective.

pp$1.parseForIn = function(node, init) {
  var isForIn = this.type === types._in;
  this.next();

  if (
    init.type === "VariableDeclaration" &&
    init.declarations[0].init != null &&
    (
      !isForIn ||
      this.options.ecmaVersion < 8 ||
      this.strict ||
      init.kind !== "var" ||
      init.declarations[0].id.type !== "Identifier"
    )
  ) {
    this.raise(
      init.start,
      ((isForIn ? "for-in" : "for-of") + " loop variable declaration may not have an initializer")
    );
  } else if (init.type === "AssignmentPattern") {
    this.raise(init.start, "Invalid left-hand side in for-loop");
  }
  node.left = init;
  node.right = isForIn ? this.parseExpression() : this.parseMaybeAssign();
  this.expect(types.parenR);
  node.body = this.parseStatement("for");
  this.exitScope();
  this.labels.pop();
  return this.finishNode(node, isForIn ? "ForInStatement" : "ForOfStatement")
};

// Parse a list of variable declarations.

pp$1.parseVar = function(node, isFor, kind) {
  node.declarations = [];
  node.kind = kind;
  for (;;) {
    var decl = this.startNode();
    this.parseVarId(decl, kind);
    if (this.eat(types.eq)) {
      decl.init = this.parseMaybeAssign(isFor);
    } else if (kind === "const" && !(this.type === types._in || (this.options.ecmaVersion >= 6 && this.isContextual("of")))) {
      this.unexpected();
    } else if (decl.id.type !== "Identifier" && !(isFor && (this.type === types._in || this.isContextual("of")))) {
      this.raise(this.lastTokEnd, "Complex binding patterns require an initialization value");
    } else {
      decl.init = null;
    }
    node.declarations.push(this.finishNode(decl, "VariableDeclarator"));
    if (!this.eat(types.comma)) { break }
  }
  return node
};

pp$1.parseVarId = function(decl, kind) {
  decl.id = this.parseBindingAtom();
  this.checkLVal(decl.id, kind === "var" ? BIND_VAR : BIND_LEXICAL, false);
};

var FUNC_STATEMENT = 1, FUNC_HANGING_STATEMENT = 2, FUNC_NULLABLE_ID = 4;

// Parse a function declaration or literal (depending on the
// `statement & FUNC_STATEMENT`).

// Remove `allowExpressionBody` for 7.0.0, as it is only called with false
pp$1.parseFunction = function(node, statement, allowExpressionBody, isAsync) {
  this.initFunction(node);
  if (this.options.ecmaVersion >= 9 || this.options.ecmaVersion >= 6 && !isAsync) {
    if (this.type === types.star && (statement & FUNC_HANGING_STATEMENT))
      { this.unexpected(); }
    node.generator = this.eat(types.star);
  }
  if (this.options.ecmaVersion >= 8)
    { node.async = !!isAsync; }

  if (statement & FUNC_STATEMENT) {
    node.id = (statement & FUNC_NULLABLE_ID) && this.type !== types.name ? null : this.parseIdent();
    if (node.id && !(statement & FUNC_HANGING_STATEMENT))
      // If it is a regular function declaration in sloppy mode, then it is
      // subject to Annex B semantics (BIND_FUNCTION). Otherwise, the binding
      // mode depends on properties of the current scope (see
      // treatFunctionsAsVar).
      { this.checkLVal(node.id, (this.strict || node.generator || node.async) ? this.treatFunctionsAsVar ? BIND_VAR : BIND_LEXICAL : BIND_FUNCTION); }
  }

  var oldYieldPos = this.yieldPos, oldAwaitPos = this.awaitPos, oldAwaitIdentPos = this.awaitIdentPos;
  this.yieldPos = 0;
  this.awaitPos = 0;
  this.awaitIdentPos = 0;
  this.enterScope(functionFlags(node.async, node.generator));

  if (!(statement & FUNC_STATEMENT))
    { node.id = this.type === types.name ? this.parseIdent() : null; }

  this.parseFunctionParams(node);
  this.parseFunctionBody(node, allowExpressionBody, false);

  this.yieldPos = oldYieldPos;
  this.awaitPos = oldAwaitPos;
  this.awaitIdentPos = oldAwaitIdentPos;
  return this.finishNode(node, (statement & FUNC_STATEMENT) ? "FunctionDeclaration" : "FunctionExpression")
};

pp$1.parseFunctionParams = function(node) {
  this.expect(types.parenL);
  node.params = this.parseBindingList(types.parenR, false, this.options.ecmaVersion >= 8);
  this.checkYieldAwaitInDefaultParams();
};

// Parse a class declaration or literal (depending on the
// `isStatement` parameter).

pp$1.parseClass = function(node, isStatement) {
  this.next();

  // ecma-262 14.6 Class Definitions
  // A class definition is always strict mode code.
  var oldStrict = this.strict;
  this.strict = true;

  this.parseClassId(node, isStatement);
  this.parseClassSuper(node);
  var classBody = this.startNode();
  var hadConstructor = false;
  classBody.body = [];
  this.expect(types.braceL);
  while (this.type !== types.braceR) {
    var element = this.parseClassElement(node.superClass !== null);
    if (element) {
      classBody.body.push(element);
      if (element.type === "MethodDefinition" && element.kind === "constructor") {
        if (hadConstructor) { this.raise(element.start, "Duplicate constructor in the same class"); }
        hadConstructor = true;
      }
    }
  }
  this.strict = oldStrict;
  this.next();
  node.body = this.finishNode(classBody, "ClassBody");
  return this.finishNode(node, isStatement ? "ClassDeclaration" : "ClassExpression")
};

pp$1.parseClassElement = function(constructorAllowsSuper) {
  var this$1 = this;

  if (this.eat(types.semi)) { return null }

  var method = this.startNode();
  var tryContextual = function (k, noLineBreak) {
    if ( noLineBreak === void 0 ) noLineBreak = false;

    var start = this$1.start, startLoc = this$1.startLoc;
    if (!this$1.eatContextual(k)) { return false }
    if (this$1.type !== types.parenL && (!noLineBreak || !this$1.canInsertSemicolon())) { return true }
    if (method.key) { this$1.unexpected(); }
    method.computed = false;
    method.key = this$1.startNodeAt(start, startLoc);
    method.key.name = k;
    this$1.finishNode(method.key, "Identifier");
    return false
  };

  method.kind = "method";
  method.static = tryContextual("static");
  var isGenerator = this.eat(types.star);
  var isAsync = false;
  if (!isGenerator) {
    if (this.options.ecmaVersion >= 8 && tryContextual("async", true)) {
      isAsync = true;
      isGenerator = this.options.ecmaVersion >= 9 && this.eat(types.star);
    } else if (tryContextual("get")) {
      method.kind = "get";
    } else if (tryContextual("set")) {
      method.kind = "set";
    }
  }
  if (!method.key) { this.parsePropertyName(method); }
  var key = method.key;
  var allowsDirectSuper = false;
  if (!method.computed && !method.static && (key.type === "Identifier" && key.name === "constructor" ||
      key.type === "Literal" && key.value === "constructor")) {
    if (method.kind !== "method") { this.raise(key.start, "Constructor can't have get/set modifier"); }
    if (isGenerator) { this.raise(key.start, "Constructor can't be a generator"); }
    if (isAsync) { this.raise(key.start, "Constructor can't be an async method"); }
    method.kind = "constructor";
    allowsDirectSuper = constructorAllowsSuper;
  } else if (method.static && key.type === "Identifier" && key.name === "prototype") {
    this.raise(key.start, "Classes may not have a static property named prototype");
  }
  this.parseClassMethod(method, isGenerator, isAsync, allowsDirectSuper);
  if (method.kind === "get" && method.value.params.length !== 0)
    { this.raiseRecoverable(method.value.start, "getter should have no params"); }
  if (method.kind === "set" && method.value.params.length !== 1)
    { this.raiseRecoverable(method.value.start, "setter should have exactly one param"); }
  if (method.kind === "set" && method.value.params[0].type === "RestElement")
    { this.raiseRecoverable(method.value.params[0].start, "Setter cannot use rest params"); }
  return method
};

pp$1.parseClassMethod = function(method, isGenerator, isAsync, allowsDirectSuper) {
  method.value = this.parseMethod(isGenerator, isAsync, allowsDirectSuper);
  return this.finishNode(method, "MethodDefinition")
};

pp$1.parseClassId = function(node, isStatement) {
  if (this.type === types.name) {
    node.id = this.parseIdent();
    if (isStatement)
      { this.checkLVal(node.id, BIND_LEXICAL, false); }
  } else {
    if (isStatement === true)
      { this.unexpected(); }
    node.id = null;
  }
};

pp$1.parseClassSuper = function(node) {
  node.superClass = this.eat(types._extends) ? this.parseExprSubscripts() : null;
};

// Parses module export declaration.

pp$1.parseExport = function(node, exports) {
  this.next();
  // export * from '...'
  if (this.eat(types.star)) {
    if (this.options.ecmaVersion >= 11) {
      if (this.eatContextual("as")) {
        node.exported = this.parseIdent(true);
        this.checkExport(exports, node.exported.name, this.lastTokStart);
      } else {
        node.exported = null;
      }
    }
    this.expectContextual("from");
    if (this.type !== types.string) { this.unexpected(); }
    node.source = this.parseExprAtom();
    this.semicolon();
    return this.finishNode(node, "ExportAllDeclaration")
  }
  if (this.eat(types._default)) { // export default ...
    this.checkExport(exports, "default", this.lastTokStart);
    var isAsync;
    if (this.type === types._function || (isAsync = this.isAsyncFunction())) {
      var fNode = this.startNode();
      this.next();
      if (isAsync) { this.next(); }
      node.declaration = this.parseFunction(fNode, FUNC_STATEMENT | FUNC_NULLABLE_ID, false, isAsync);
    } else if (this.type === types._class) {
      var cNode = this.startNode();
      node.declaration = this.parseClass(cNode, "nullableID");
    } else {
      node.declaration = this.parseMaybeAssign();
      this.semicolon();
    }
    return this.finishNode(node, "ExportDefaultDeclaration")
  }
  // export var|const|let|function|class ...
  if (this.shouldParseExportStatement()) {
    node.declaration = this.parseStatement(null);
    if (node.declaration.type === "VariableDeclaration")
      { this.checkVariableExport(exports, node.declaration.declarations); }
    else
      { this.checkExport(exports, node.declaration.id.name, node.declaration.id.start); }
    node.specifiers = [];
    node.source = null;
  } else { // export { x, y as z } [from '...']
    node.declaration = null;
    node.specifiers = this.parseExportSpecifiers(exports);
    if (this.eatContextual("from")) {
      if (this.type !== types.string) { this.unexpected(); }
      node.source = this.parseExprAtom();
    } else {
      for (var i = 0, list = node.specifiers; i < list.length; i += 1) {
        // check for keywords used as local names
        var spec = list[i];

        this.checkUnreserved(spec.local);
        // check if export is defined
        this.checkLocalExport(spec.local);
      }

      node.source = null;
    }
    this.semicolon();
  }
  return this.finishNode(node, "ExportNamedDeclaration")
};

pp$1.checkExport = function(exports, name, pos) {
  if (!exports) { return }
  if (has(exports, name))
    { this.raiseRecoverable(pos, "Duplicate export '" + name + "'"); }
  exports[name] = true;
};

pp$1.checkPatternExport = function(exports, pat) {
  var type = pat.type;
  if (type === "Identifier")
    { this.checkExport(exports, pat.name, pat.start); }
  else if (type === "ObjectPattern")
    { for (var i = 0, list = pat.properties; i < list.length; i += 1)
      {
        var prop = list[i];

        this.checkPatternExport(exports, prop);
      } }
  else if (type === "ArrayPattern")
    { for (var i$1 = 0, list$1 = pat.elements; i$1 < list$1.length; i$1 += 1) {
      var elt = list$1[i$1];

        if (elt) { this.checkPatternExport(exports, elt); }
    } }
  else if (type === "Property")
    { this.checkPatternExport(exports, pat.value); }
  else if (type === "AssignmentPattern")
    { this.checkPatternExport(exports, pat.left); }
  else if (type === "RestElement")
    { this.checkPatternExport(exports, pat.argument); }
  else if (type === "ParenthesizedExpression")
    { this.checkPatternExport(exports, pat.expression); }
};

pp$1.checkVariableExport = function(exports, decls) {
  if (!exports) { return }
  for (var i = 0, list = decls; i < list.length; i += 1)
    {
    var decl = list[i];

    this.checkPatternExport(exports, decl.id);
  }
};

pp$1.shouldParseExportStatement = function() {
  return this.type.keyword === "var" ||
    this.type.keyword === "const" ||
    this.type.keyword === "class" ||
    this.type.keyword === "function" ||
    this.isLet() ||
    this.isAsyncFunction()
};

// Parses a comma-separated list of module exports.

pp$1.parseExportSpecifiers = function(exports) {
  var nodes = [], first = true;
  // export { x, y as z } [from '...']
  this.expect(types.braceL);
  while (!this.eat(types.braceR)) {
    if (!first) {
      this.expect(types.comma);
      if (this.afterTrailingComma(types.braceR)) { break }
    } else { first = false; }

    var node = this.startNode();
    node.local = this.parseIdent(true);
    node.exported = this.eatContextual("as") ? this.parseIdent(true) : node.local;
    this.checkExport(exports, node.exported.name, node.exported.start);
    nodes.push(this.finishNode(node, "ExportSpecifier"));
  }
  return nodes
};

// Parses import declaration.

pp$1.parseImport = function(node) {
  this.next();
  // import '...'
  if (this.type === types.string) {
    node.specifiers = empty;
    node.source = this.parseExprAtom();
  } else {
    node.specifiers = this.parseImportSpecifiers();
    this.expectContextual("from");
    node.source = this.type === types.string ? this.parseExprAtom() : this.unexpected();
  }
  this.semicolon();
  return this.finishNode(node, "ImportDeclaration")
};

// Parses a comma-separated list of module imports.

pp$1.parseImportSpecifiers = function() {
  var nodes = [], first = true;
  if (this.type === types.name) {
    // import defaultObj, { x, y as z } from '...'
    var node = this.startNode();
    node.local = this.parseIdent();
    this.checkLVal(node.local, BIND_LEXICAL);
    nodes.push(this.finishNode(node, "ImportDefaultSpecifier"));
    if (!this.eat(types.comma)) { return nodes }
  }
  if (this.type === types.star) {
    var node$1 = this.startNode();
    this.next();
    this.expectContextual("as");
    node$1.local = this.parseIdent();
    this.checkLVal(node$1.local, BIND_LEXICAL);
    nodes.push(this.finishNode(node$1, "ImportNamespaceSpecifier"));
    return nodes
  }
  this.expect(types.braceL);
  while (!this.eat(types.braceR)) {
    if (!first) {
      this.expect(types.comma);
      if (this.afterTrailingComma(types.braceR)) { break }
    } else { first = false; }

    var node$2 = this.startNode();
    node$2.imported = this.parseIdent(true);
    if (this.eatContextual("as")) {
      node$2.local = this.parseIdent();
    } else {
      this.checkUnreserved(node$2.imported);
      node$2.local = node$2.imported;
    }
    this.checkLVal(node$2.local, BIND_LEXICAL);
    nodes.push(this.finishNode(node$2, "ImportSpecifier"));
  }
  return nodes
};

// Set `ExpressionStatement#directive` property for directive prologues.
pp$1.adaptDirectivePrologue = function(statements) {
  for (var i = 0; i < statements.length && this.isDirectiveCandidate(statements[i]); ++i) {
    statements[i].directive = statements[i].expression.raw.slice(1, -1);
  }
};
pp$1.isDirectiveCandidate = function(statement) {
  return (
    statement.type === "ExpressionStatement" &&
    statement.expression.type === "Literal" &&
    typeof statement.expression.value === "string" &&
    // Reject parenthesized strings.
    (this.input[statement.start] === "\"" || this.input[statement.start] === "'")
  )
};

var pp$2 = Parser.prototype;

// Convert existing expression atom to assignable pattern
// if possible.

pp$2.toAssignable = function(node, isBinding, refDestructuringErrors) {
  if (this.options.ecmaVersion >= 6 && node) {
    switch (node.type) {
    case "Identifier":
      if (this.inAsync && node.name === "await")
        { this.raise(node.start, "Cannot use 'await' as identifier inside an async function"); }
      break

    case "ObjectPattern":
    case "ArrayPattern":
    case "RestElement":
      break

    case "ObjectExpression":
      node.type = "ObjectPattern";
      if (refDestructuringErrors) { this.checkPatternErrors(refDestructuringErrors, true); }
      for (var i = 0, list = node.properties; i < list.length; i += 1) {
        var prop = list[i];

      this.toAssignable(prop, isBinding);
        // Early error:
        //   AssignmentRestProperty[Yield, Await] :
        //     `...` DestructuringAssignmentTarget[Yield, Await]
        //
        //   It is a Syntax Error if |DestructuringAssignmentTarget| is an |ArrayLiteral| or an |ObjectLiteral|.
        if (
          prop.type === "RestElement" &&
          (prop.argument.type === "ArrayPattern" || prop.argument.type === "ObjectPattern")
        ) {
          this.raise(prop.argument.start, "Unexpected token");
        }
      }
      break

    case "Property":
      // AssignmentProperty has type === "Property"
      if (node.kind !== "init") { this.raise(node.key.start, "Object pattern can't contain getter or setter"); }
      this.toAssignable(node.value, isBinding);
      break

    case "ArrayExpression":
      node.type = "ArrayPattern";
      if (refDestructuringErrors) { this.checkPatternErrors(refDestructuringErrors, true); }
      this.toAssignableList(node.elements, isBinding);
      break

    case "SpreadElement":
      node.type = "RestElement";
      this.toAssignable(node.argument, isBinding);
      if (node.argument.type === "AssignmentPattern")
        { this.raise(node.argument.start, "Rest elements cannot have a default value"); }
      break

    case "AssignmentExpression":
      if (node.operator !== "=") { this.raise(node.left.end, "Only '=' operator can be used for specifying default value."); }
      node.type = "AssignmentPattern";
      delete node.operator;
      this.toAssignable(node.left, isBinding);
      // falls through to AssignmentPattern

    case "AssignmentPattern":
      break

    case "ParenthesizedExpression":
      this.toAssignable(node.expression, isBinding, refDestructuringErrors);
      break

    case "ChainExpression":
      this.raiseRecoverable(node.start, "Optional chaining cannot appear in left-hand side");
      break

    case "MemberExpression":
      if (!isBinding) { break }

    default:
      this.raise(node.start, "Assigning to rvalue");
    }
  } else if (refDestructuringErrors) { this.checkPatternErrors(refDestructuringErrors, true); }
  return node
};

// Convert list of expression atoms to binding list.

pp$2.toAssignableList = function(exprList, isBinding) {
  var end = exprList.length;
  for (var i = 0; i < end; i++) {
    var elt = exprList[i];
    if (elt) { this.toAssignable(elt, isBinding); }
  }
  if (end) {
    var last = exprList[end - 1];
    if (this.options.ecmaVersion === 6 && isBinding && last && last.type === "RestElement" && last.argument.type !== "Identifier")
      { this.unexpected(last.argument.start); }
  }
  return exprList
};

// Parses spread element.

pp$2.parseSpread = function(refDestructuringErrors) {
  var node = this.startNode();
  this.next();
  node.argument = this.parseMaybeAssign(false, refDestructuringErrors);
  return this.finishNode(node, "SpreadElement")
};

pp$2.parseRestBinding = function() {
  var node = this.startNode();
  this.next();

  // RestElement inside of a function parameter must be an identifier
  if (this.options.ecmaVersion === 6 && this.type !== types.name)
    { this.unexpected(); }

  node.argument = this.parseBindingAtom();

  return this.finishNode(node, "RestElement")
};

// Parses lvalue (assignable) atom.

pp$2.parseBindingAtom = function() {
  if (this.options.ecmaVersion >= 6) {
    switch (this.type) {
    case types.bracketL:
      var node = this.startNode();
      this.next();
      node.elements = this.parseBindingList(types.bracketR, true, true);
      return this.finishNode(node, "ArrayPattern")

    case types.braceL:
      return this.parseObj(true)
    }
  }
  return this.parseIdent()
};

pp$2.parseBindingList = function(close, allowEmpty, allowTrailingComma) {
  var elts = [], first = true;
  while (!this.eat(close)) {
    if (first) { first = false; }
    else { this.expect(types.comma); }
    if (allowEmpty && this.type === types.comma) {
      elts.push(null);
    } else if (allowTrailingComma && this.afterTrailingComma(close)) {
      break
    } else if (this.type === types.ellipsis) {
      var rest = this.parseRestBinding();
      this.parseBindingListItem(rest);
      elts.push(rest);
      if (this.type === types.comma) { this.raise(this.start, "Comma is not permitted after the rest element"); }
      this.expect(close);
      break
    } else {
      var elem = this.parseMaybeDefault(this.start, this.startLoc);
      this.parseBindingListItem(elem);
      elts.push(elem);
    }
  }
  return elts
};

pp$2.parseBindingListItem = function(param) {
  return param
};

// Parses assignment pattern around given atom if possible.

pp$2.parseMaybeDefault = function(startPos, startLoc, left) {
  left = left || this.parseBindingAtom();
  if (this.options.ecmaVersion < 6 || !this.eat(types.eq)) { return left }
  var node = this.startNodeAt(startPos, startLoc);
  node.left = left;
  node.right = this.parseMaybeAssign();
  return this.finishNode(node, "AssignmentPattern")
};

// Verify that a node is an lval — something that can be assigned
// to.
// bindingType can be either:
// 'var' indicating that the lval creates a 'var' binding
// 'let' indicating that the lval creates a lexical ('let' or 'const') binding
// 'none' indicating that the binding should be checked for illegal identifiers, but not for duplicate references

pp$2.checkLVal = function(expr, bindingType, checkClashes) {
  if ( bindingType === void 0 ) bindingType = BIND_NONE;

  switch (expr.type) {
  case "Identifier":
    if (bindingType === BIND_LEXICAL && expr.name === "let")
      { this.raiseRecoverable(expr.start, "let is disallowed as a lexically bound name"); }
    if (this.strict && this.reservedWordsStrictBind.test(expr.name))
      { this.raiseRecoverable(expr.start, (bindingType ? "Binding " : "Assigning to ") + expr.name + " in strict mode"); }
    if (checkClashes) {
      if (has(checkClashes, expr.name))
        { this.raiseRecoverable(expr.start, "Argument name clash"); }
      checkClashes[expr.name] = true;
    }
    if (bindingType !== BIND_NONE && bindingType !== BIND_OUTSIDE) { this.declareName(expr.name, bindingType, expr.start); }
    break

  case "ChainExpression":
    this.raiseRecoverable(expr.start, "Optional chaining cannot appear in left-hand side");
    break

  case "MemberExpression":
    if (bindingType) { this.raiseRecoverable(expr.start, "Binding member expression"); }
    break

  case "ObjectPattern":
    for (var i = 0, list = expr.properties; i < list.length; i += 1)
      {
    var prop = list[i];

    this.checkLVal(prop, bindingType, checkClashes);
  }
    break

  case "Property":
    // AssignmentProperty has type === "Property"
    this.checkLVal(expr.value, bindingType, checkClashes);
    break

  case "ArrayPattern":
    for (var i$1 = 0, list$1 = expr.elements; i$1 < list$1.length; i$1 += 1) {
      var elem = list$1[i$1];

    if (elem) { this.checkLVal(elem, bindingType, checkClashes); }
    }
    break

  case "AssignmentPattern":
    this.checkLVal(expr.left, bindingType, checkClashes);
    break

  case "RestElement":
    this.checkLVal(expr.argument, bindingType, checkClashes);
    break

  case "ParenthesizedExpression":
    this.checkLVal(expr.expression, bindingType, checkClashes);
    break

  default:
    this.raise(expr.start, (bindingType ? "Binding" : "Assigning to") + " rvalue");
  }
};

// A recursive descent parser operates by defining functions for all

var pp$3 = Parser.prototype;

// Check if property name clashes with already added.
// Object/class getters and setters are not allowed to clash —
// either with each other or with an init property — and in
// strict mode, init properties are also not allowed to be repeated.

pp$3.checkPropClash = function(prop, propHash, refDestructuringErrors) {
  if (this.options.ecmaVersion >= 9 && prop.type === "SpreadElement")
    { return }
  if (this.options.ecmaVersion >= 6 && (prop.computed || prop.method || prop.shorthand))
    { return }
  var key = prop.key;
  var name;
  switch (key.type) {
  case "Identifier": name = key.name; break
  case "Literal": name = String(key.value); break
  default: return
  }
  var kind = prop.kind;
  if (this.options.ecmaVersion >= 6) {
    if (name === "__proto__" && kind === "init") {
      if (propHash.proto) {
        if (refDestructuringErrors) {
          if (refDestructuringErrors.doubleProto < 0)
            { refDestructuringErrors.doubleProto = key.start; }
          // Backwards-compat kludge. Can be removed in version 6.0
        } else { this.raiseRecoverable(key.start, "Redefinition of __proto__ property"); }
      }
      propHash.proto = true;
    }
    return
  }
  name = "$" + name;
  var other = propHash[name];
  if (other) {
    var redefinition;
    if (kind === "init") {
      redefinition = this.strict && other.init || other.get || other.set;
    } else {
      redefinition = other.init || other[kind];
    }
    if (redefinition)
      { this.raiseRecoverable(key.start, "Redefinition of property"); }
  } else {
    other = propHash[name] = {
      init: false,
      get: false,
      set: false
    };
  }
  other[kind] = true;
};

// ### Expression parsing

// These nest, from the most general expression type at the top to
// 'atomic', nondivisible expression types at the bottom. Most of
// the functions will simply let the function(s) below them parse,
// and, *if* the syntactic construct they handle is present, wrap
// the AST node that the inner parser gave them in another node.

// Parse a full expression. The optional arguments are used to
// forbid the `in` operator (in for loops initalization expressions)
// and provide reference for storing '=' operator inside shorthand
// property assignment in contexts where both object expression
// and object pattern might appear (so it's possible to raise
// delayed syntax error at correct position).

pp$3.parseExpression = function(noIn, refDestructuringErrors) {
  var startPos = this.start, startLoc = this.startLoc;
  var expr = this.parseMaybeAssign(noIn, refDestructuringErrors);
  if (this.type === types.comma) {
    var node = this.startNodeAt(startPos, startLoc);
    node.expressions = [expr];
    while (this.eat(types.comma)) { node.expressions.push(this.parseMaybeAssign(noIn, refDestructuringErrors)); }
    return this.finishNode(node, "SequenceExpression")
  }
  return expr
};

// Parse an assignment expression. This includes applications of
// operators like `+=`.

pp$3.parseMaybeAssign = function(noIn, refDestructuringErrors, afterLeftParse) {
  if (this.isContextual("yield")) {
    if (this.inGenerator) { return this.parseYield(noIn) }
    // The tokenizer will assume an expression is allowed after
    // `yield`, but this isn't that kind of yield
    else { this.exprAllowed = false; }
  }

  var ownDestructuringErrors = false, oldParenAssign = -1, oldTrailingComma = -1;
  if (refDestructuringErrors) {
    oldParenAssign = refDestructuringErrors.parenthesizedAssign;
    oldTrailingComma = refDestructuringErrors.trailingComma;
    refDestructuringErrors.parenthesizedAssign = refDestructuringErrors.trailingComma = -1;
  } else {
    refDestructuringErrors = new DestructuringErrors;
    ownDestructuringErrors = true;
  }

  var startPos = this.start, startLoc = this.startLoc;
  if (this.type === types.parenL || this.type === types.name)
    { this.potentialArrowAt = this.start; }
  var left = this.parseMaybeConditional(noIn, refDestructuringErrors);
  if (afterLeftParse) { left = afterLeftParse.call(this, left, startPos, startLoc); }
  if (this.type.isAssign) {
    var node = this.startNodeAt(startPos, startLoc);
    node.operator = this.value;
    node.left = this.type === types.eq ? this.toAssignable(left, false, refDestructuringErrors) : left;
    if (!ownDestructuringErrors) {
      refDestructuringErrors.parenthesizedAssign = refDestructuringErrors.trailingComma = refDestructuringErrors.doubleProto = -1;
    }
    if (refDestructuringErrors.shorthandAssign >= node.left.start)
      { refDestructuringErrors.shorthandAssign = -1; } // reset because shorthand default was used correctly
    this.checkLVal(left);
    this.next();
    node.right = this.parseMaybeAssign(noIn);
    return this.finishNode(node, "AssignmentExpression")
  } else {
    if (ownDestructuringErrors) { this.checkExpressionErrors(refDestructuringErrors, true); }
  }
  if (oldParenAssign > -1) { refDestructuringErrors.parenthesizedAssign = oldParenAssign; }
  if (oldTrailingComma > -1) { refDestructuringErrors.trailingComma = oldTrailingComma; }
  return left
};

// Parse a ternary conditional (`?:`) operator.

pp$3.parseMaybeConditional = function(noIn, refDestructuringErrors) {
  var startPos = this.start, startLoc = this.startLoc;
  var expr = this.parseExprOps(noIn, refDestructuringErrors);
  if (this.checkExpressionErrors(refDestructuringErrors)) { return expr }
  if (this.eat(types.question)) {
    var node = this.startNodeAt(startPos, startLoc);
    node.test = expr;
    node.consequent = this.parseMaybeAssign();
    this.expect(types.colon);
    node.alternate = this.parseMaybeAssign(noIn);
    return this.finishNode(node, "ConditionalExpression")
  }
  return expr
};

// Start the precedence parser.

pp$3.parseExprOps = function(noIn, refDestructuringErrors) {
  var startPos = this.start, startLoc = this.startLoc;
  var expr = this.parseMaybeUnary(refDestructuringErrors, false);
  if (this.checkExpressionErrors(refDestructuringErrors)) { return expr }
  return expr.start === startPos && expr.type === "ArrowFunctionExpression" ? expr : this.parseExprOp(expr, startPos, startLoc, -1, noIn)
};

// Parse binary operators with the operator precedence parsing
// algorithm. `left` is the left-hand side of the operator.
// `minPrec` provides context that allows the function to stop and
// defer further parser to one of its callers when it encounters an
// operator that has a lower precedence than the set it is parsing.

pp$3.parseExprOp = function(left, leftStartPos, leftStartLoc, minPrec, noIn) {
  var prec = this.type.binop;
  if (prec != null && (!noIn || this.type !== types._in)) {
    if (prec > minPrec) {
      var logical = this.type === types.logicalOR || this.type === types.logicalAND;
      var coalesce = this.type === types.coalesce;
      if (coalesce) {
        // Handle the precedence of `tt.coalesce` as equal to the range of logical expressions.
        // In other words, `node.right` shouldn't contain logical expressions in order to check the mixed error.
        prec = types.logicalAND.binop;
      }
      var op = this.value;
      this.next();
      var startPos = this.start, startLoc = this.startLoc;
      var right = this.parseExprOp(this.parseMaybeUnary(null, false), startPos, startLoc, prec, noIn);
      var node = this.buildBinary(leftStartPos, leftStartLoc, left, right, op, logical || coalesce);
      if ((logical && this.type === types.coalesce) || (coalesce && (this.type === types.logicalOR || this.type === types.logicalAND))) {
        this.raiseRecoverable(this.start, "Logical expressions and coalesce expressions cannot be mixed. Wrap either by parentheses");
      }
      return this.parseExprOp(node, leftStartPos, leftStartLoc, minPrec, noIn)
    }
  }
  return left
};

pp$3.buildBinary = function(startPos, startLoc, left, right, op, logical) {
  var node = this.startNodeAt(startPos, startLoc);
  node.left = left;
  node.operator = op;
  node.right = right;
  return this.finishNode(node, logical ? "LogicalExpression" : "BinaryExpression")
};

// Parse unary operators, both prefix and postfix.

pp$3.parseMaybeUnary = function(refDestructuringErrors, sawUnary) {
  var startPos = this.start, startLoc = this.startLoc, expr;
  if (this.isContextual("await") && (this.inAsync || (!this.inFunction && this.options.allowAwaitOutsideFunction))) {
    expr = this.parseAwait();
    sawUnary = true;
  } else if (this.type.prefix) {
    var node = this.startNode(), update = this.type === types.incDec;
    node.operator = this.value;
    node.prefix = true;
    this.next();
    node.argument = this.parseMaybeUnary(null, true);
    this.checkExpressionErrors(refDestructuringErrors, true);
    if (update) { this.checkLVal(node.argument); }
    else if (this.strict && node.operator === "delete" &&
             node.argument.type === "Identifier")
      { this.raiseRecoverable(node.start, "Deleting local variable in strict mode"); }
    else { sawUnary = true; }
    expr = this.finishNode(node, update ? "UpdateExpression" : "UnaryExpression");
  } else {
    expr = this.parseExprSubscripts(refDestructuringErrors);
    if (this.checkExpressionErrors(refDestructuringErrors)) { return expr }
    while (this.type.postfix && !this.canInsertSemicolon()) {
      var node$1 = this.startNodeAt(startPos, startLoc);
      node$1.operator = this.value;
      node$1.prefix = false;
      node$1.argument = expr;
      this.checkLVal(expr);
      this.next();
      expr = this.finishNode(node$1, "UpdateExpression");
    }
  }

  if (!sawUnary && this.eat(types.starstar))
    { return this.buildBinary(startPos, startLoc, expr, this.parseMaybeUnary(null, false), "**", false) }
  else
    { return expr }
};

// Parse call, dot, and `[]`-subscript expressions.

pp$3.parseExprSubscripts = function(refDestructuringErrors) {
  var startPos = this.start, startLoc = this.startLoc;
  var expr = this.parseExprAtom(refDestructuringErrors);
  if (expr.type === "ArrowFunctionExpression" && this.input.slice(this.lastTokStart, this.lastTokEnd) !== ")")
    { return expr }
  var result = this.parseSubscripts(expr, startPos, startLoc);
  if (refDestructuringErrors && result.type === "MemberExpression") {
    if (refDestructuringErrors.parenthesizedAssign >= result.start) { refDestructuringErrors.parenthesizedAssign = -1; }
    if (refDestructuringErrors.parenthesizedBind >= result.start) { refDestructuringErrors.parenthesizedBind = -1; }
  }
  return result
};

pp$3.parseSubscripts = function(base, startPos, startLoc, noCalls) {
  var maybeAsyncArrow = this.options.ecmaVersion >= 8 && base.type === "Identifier" && base.name === "async" &&
      this.lastTokEnd === base.end && !this.canInsertSemicolon() && base.end - base.start === 5 &&
      this.potentialArrowAt === base.start;
  var optionalChained = false;

  while (true) {
    var element = this.parseSubscript(base, startPos, startLoc, noCalls, maybeAsyncArrow, optionalChained);

    if (element.optional) { optionalChained = true; }
    if (element === base || element.type === "ArrowFunctionExpression") {
      if (optionalChained) {
        var chainNode = this.startNodeAt(startPos, startLoc);
        chainNode.expression = element;
        element = this.finishNode(chainNode, "ChainExpression");
      }
      return element
    }

    base = element;
  }
};

pp$3.parseSubscript = function(base, startPos, startLoc, noCalls, maybeAsyncArrow, optionalChained) {
  var optionalSupported = this.options.ecmaVersion >= 11;
  var optional = optionalSupported && this.eat(types.questionDot);
  if (noCalls && optional) { this.raise(this.lastTokStart, "Optional chaining cannot appear in the callee of new expressions"); }

  var computed = this.eat(types.bracketL);
  if (computed || (optional && this.type !== types.parenL && this.type !== types.backQuote) || this.eat(types.dot)) {
    var node = this.startNodeAt(startPos, startLoc);
    node.object = base;
    node.property = computed ? this.parseExpression() : this.parseIdent(this.options.allowReserved !== "never");
    node.computed = !!computed;
    if (computed) { this.expect(types.bracketR); }
    if (optionalSupported) {
      node.optional = optional;
    }
    base = this.finishNode(node, "MemberExpression");
  } else if (!noCalls && this.eat(types.parenL)) {
    var refDestructuringErrors = new DestructuringErrors, oldYieldPos = this.yieldPos, oldAwaitPos = this.awaitPos, oldAwaitIdentPos = this.awaitIdentPos;
    this.yieldPos = 0;
    this.awaitPos = 0;
    this.awaitIdentPos = 0;
    var exprList = this.parseExprList(types.parenR, this.options.ecmaVersion >= 8, false, refDestructuringErrors);
    if (maybeAsyncArrow && !optional && !this.canInsertSemicolon() && this.eat(types.arrow)) {
      this.checkPatternErrors(refDestructuringErrors, false);
      this.checkYieldAwaitInDefaultParams();
      if (this.awaitIdentPos > 0)
        { this.raise(this.awaitIdentPos, "Cannot use 'await' as identifier inside an async function"); }
      this.yieldPos = oldYieldPos;
      this.awaitPos = oldAwaitPos;
      this.awaitIdentPos = oldAwaitIdentPos;
      return this.parseArrowExpression(this.startNodeAt(startPos, startLoc), exprList, true)
    }
    this.checkExpressionErrors(refDestructuringErrors, true);
    this.yieldPos = oldYieldPos || this.yieldPos;
    this.awaitPos = oldAwaitPos || this.awaitPos;
    this.awaitIdentPos = oldAwaitIdentPos || this.awaitIdentPos;
    var node$1 = this.startNodeAt(startPos, startLoc);
    node$1.callee = base;
    node$1.arguments = exprList;
    if (optionalSupported) {
      node$1.optional = optional;
    }
    base = this.finishNode(node$1, "CallExpression");
  } else if (this.type === types.backQuote) {
    if (optional || optionalChained) {
      this.raise(this.start, "Optional chaining cannot appear in the tag of tagged template expressions");
    }
    var node$2 = this.startNodeAt(startPos, startLoc);
    node$2.tag = base;
    node$2.quasi = this.parseTemplate({isTagged: true});
    base = this.finishNode(node$2, "TaggedTemplateExpression");
  }
  return base
};

// Parse an atomic expression — either a single token that is an
// expression, an expression started by a keyword like `function` or
// `new`, or an expression wrapped in punctuation like `()`, `[]`,
// or `{}`.

pp$3.parseExprAtom = function(refDestructuringErrors) {
  // If a division operator appears in an expression position, the
  // tokenizer got confused, and we force it to read a regexp instead.
  if (this.type === types.slash) { this.readRegexp(); }

  var node, canBeArrow = this.potentialArrowAt === this.start;
  switch (this.type) {
  case types._super:
    if (!this.allowSuper)
      { this.raise(this.start, "'super' keyword outside a method"); }
    node = this.startNode();
    this.next();
    if (this.type === types.parenL && !this.allowDirectSuper)
      { this.raise(node.start, "super() call outside constructor of a subclass"); }
    // The `super` keyword can appear at below:
    // SuperProperty:
    //     super [ Expression ]
    //     super . IdentifierName
    // SuperCall:
    //     super ( Arguments )
    if (this.type !== types.dot && this.type !== types.bracketL && this.type !== types.parenL)
      { this.unexpected(); }
    return this.finishNode(node, "Super")

  case types._this:
    node = this.startNode();
    this.next();
    return this.finishNode(node, "ThisExpression")

  case types.name:
    var startPos = this.start, startLoc = this.startLoc, containsEsc = this.containsEsc;
    var id = this.parseIdent(false);
    if (this.options.ecmaVersion >= 8 && !containsEsc && id.name === "async" && !this.canInsertSemicolon() && this.eat(types._function))
      { return this.parseFunction(this.startNodeAt(startPos, startLoc), 0, false, true) }
    if (canBeArrow && !this.canInsertSemicolon()) {
      if (this.eat(types.arrow))
        { return this.parseArrowExpression(this.startNodeAt(startPos, startLoc), [id], false) }
      if (this.options.ecmaVersion >= 8 && id.name === "async" && this.type === types.name && !containsEsc) {
        id = this.parseIdent(false);
        if (this.canInsertSemicolon() || !this.eat(types.arrow))
          { this.unexpected(); }
        return this.parseArrowExpression(this.startNodeAt(startPos, startLoc), [id], true)
      }
    }
    return id

  case types.regexp:
    var value = this.value;
    node = this.parseLiteral(value.value);
    node.regex = {pattern: value.pattern, flags: value.flags};
    return node

  case types.num: case types.string:
    return this.parseLiteral(this.value)

  case types._null: case types._true: case types._false:
    node = this.startNode();
    node.value = this.type === types._null ? null : this.type === types._true;
    node.raw = this.type.keyword;
    this.next();
    return this.finishNode(node, "Literal")

  case types.parenL:
    var start = this.start, expr = this.parseParenAndDistinguishExpression(canBeArrow);
    if (refDestructuringErrors) {
      if (refDestructuringErrors.parenthesizedAssign < 0 && !this.isSimpleAssignTarget(expr))
        { refDestructuringErrors.parenthesizedAssign = start; }
      if (refDestructuringErrors.parenthesizedBind < 0)
        { refDestructuringErrors.parenthesizedBind = start; }
    }
    return expr

  case types.bracketL:
    node = this.startNode();
    this.next();
    node.elements = this.parseExprList(types.bracketR, true, true, refDestructuringErrors);
    return this.finishNode(node, "ArrayExpression")

  case types.braceL:
    return this.parseObj(false, refDestructuringErrors)

  case types._function:
    node = this.startNode();
    this.next();
    return this.parseFunction(node, 0)

  case types._class:
    return this.parseClass(this.startNode(), false)

  case types._new:
    return this.parseNew()

  case types.backQuote:
    return this.parseTemplate()

  case types._import:
    if (this.options.ecmaVersion >= 11) {
      return this.parseExprImport()
    } else {
      return this.unexpected()
    }

  default:
    this.unexpected();
  }
};

pp$3.parseExprImport = function() {
  var node = this.startNode();

  // Consume `import` as an identifier for `import.meta`.
  // Because `this.parseIdent(true)` doesn't check escape sequences, it needs the check of `this.containsEsc`.
  if (this.containsEsc) { this.raiseRecoverable(this.start, "Escape sequence in keyword import"); }
  var meta = this.parseIdent(true);

  switch (this.type) {
  case types.parenL:
    return this.parseDynamicImport(node)
  case types.dot:
    node.meta = meta;
    return this.parseImportMeta(node)
  default:
    this.unexpected();
  }
};

pp$3.parseDynamicImport = function(node) {
  this.next(); // skip `(`

  // Parse node.source.
  node.source = this.parseMaybeAssign();

  // Verify ending.
  if (!this.eat(types.parenR)) {
    var errorPos = this.start;
    if (this.eat(types.comma) && this.eat(types.parenR)) {
      this.raiseRecoverable(errorPos, "Trailing comma is not allowed in import()");
    } else {
      this.unexpected(errorPos);
    }
  }

  return this.finishNode(node, "ImportExpression")
};

pp$3.parseImportMeta = function(node) {
  this.next(); // skip `.`

  var containsEsc = this.containsEsc;
  node.property = this.parseIdent(true);

  if (node.property.name !== "meta")
    { this.raiseRecoverable(node.property.start, "The only valid meta property for import is 'import.meta'"); }
  if (containsEsc)
    { this.raiseRecoverable(node.start, "'import.meta' must not contain escaped characters"); }
  if (this.options.sourceType !== "module")
    { this.raiseRecoverable(node.start, "Cannot use 'import.meta' outside a module"); }

  return this.finishNode(node, "MetaProperty")
};

pp$3.parseLiteral = function(value) {
  var node = this.startNode();
  node.value = value;
  node.raw = this.input.slice(this.start, this.end);
  if (node.raw.charCodeAt(node.raw.length - 1) === 110) { node.bigint = node.raw.slice(0, -1).replace(/_/g, ""); }
  this.next();
  return this.finishNode(node, "Literal")
};

pp$3.parseParenExpression = function() {
  this.expect(types.parenL);
  var val = this.parseExpression();
  this.expect(types.parenR);
  return val
};

pp$3.parseParenAndDistinguishExpression = function(canBeArrow) {
  var startPos = this.start, startLoc = this.startLoc, val, allowTrailingComma = this.options.ecmaVersion >= 8;
  if (this.options.ecmaVersion >= 6) {
    this.next();

    var innerStartPos = this.start, innerStartLoc = this.startLoc;
    var exprList = [], first = true, lastIsComma = false;
    var refDestructuringErrors = new DestructuringErrors, oldYieldPos = this.yieldPos, oldAwaitPos = this.awaitPos, spreadStart;
    this.yieldPos = 0;
    this.awaitPos = 0;
    // Do not save awaitIdentPos to allow checking awaits nested in parameters
    while (this.type !== types.parenR) {
      first ? first = false : this.expect(types.comma);
      if (allowTrailingComma && this.afterTrailingComma(types.parenR, true)) {
        lastIsComma = true;
        break
      } else if (this.type === types.ellipsis) {
        spreadStart = this.start;
        exprList.push(this.parseParenItem(this.parseRestBinding()));
        if (this.type === types.comma) { this.raise(this.start, "Comma is not permitted after the rest element"); }
        break
      } else {
        exprList.push(this.parseMaybeAssign(false, refDestructuringErrors, this.parseParenItem));
      }
    }
    var innerEndPos = this.start, innerEndLoc = this.startLoc;
    this.expect(types.parenR);

    if (canBeArrow && !this.canInsertSemicolon() && this.eat(types.arrow)) {
      this.checkPatternErrors(refDestructuringErrors, false);
      this.checkYieldAwaitInDefaultParams();
      this.yieldPos = oldYieldPos;
      this.awaitPos = oldAwaitPos;
      return this.parseParenArrowList(startPos, startLoc, exprList)
    }

    if (!exprList.length || lastIsComma) { this.unexpected(this.lastTokStart); }
    if (spreadStart) { this.unexpected(spreadStart); }
    this.checkExpressionErrors(refDestructuringErrors, true);
    this.yieldPos = oldYieldPos || this.yieldPos;
    this.awaitPos = oldAwaitPos || this.awaitPos;

    if (exprList.length > 1) {
      val = this.startNodeAt(innerStartPos, innerStartLoc);
      val.expressions = exprList;
      this.finishNodeAt(val, "SequenceExpression", innerEndPos, innerEndLoc);
    } else {
      val = exprList[0];
    }
  } else {
    val = this.parseParenExpression();
  }

  if (this.options.preserveParens) {
    var par = this.startNodeAt(startPos, startLoc);
    par.expression = val;
    return this.finishNode(par, "ParenthesizedExpression")
  } else {
    return val
  }
};

pp$3.parseParenItem = function(item) {
  return item
};

pp$3.parseParenArrowList = function(startPos, startLoc, exprList) {
  return this.parseArrowExpression(this.startNodeAt(startPos, startLoc), exprList)
};

// New's precedence is slightly tricky. It must allow its argument to
// be a `[]` or dot subscript expression, but not a call — at least,
// not without wrapping it in parentheses. Thus, it uses the noCalls
// argument to parseSubscripts to prevent it from consuming the
// argument list.

var empty$1 = [];

pp$3.parseNew = function() {
  if (this.containsEsc) { this.raiseRecoverable(this.start, "Escape sequence in keyword new"); }
  var node = this.startNode();
  var meta = this.parseIdent(true);
  if (this.options.ecmaVersion >= 6 && this.eat(types.dot)) {
    node.meta = meta;
    var containsEsc = this.containsEsc;
    node.property = this.parseIdent(true);
    if (node.property.name !== "target")
      { this.raiseRecoverable(node.property.start, "The only valid meta property for new is 'new.target'"); }
    if (containsEsc)
      { this.raiseRecoverable(node.start, "'new.target' must not contain escaped characters"); }
    if (!this.inNonArrowFunction())
      { this.raiseRecoverable(node.start, "'new.target' can only be used in functions"); }
    return this.finishNode(node, "MetaProperty")
  }
  var startPos = this.start, startLoc = this.startLoc, isImport = this.type === types._import;
  node.callee = this.parseSubscripts(this.parseExprAtom(), startPos, startLoc, true);
  if (isImport && node.callee.type === "ImportExpression") {
    this.raise(startPos, "Cannot use new with import()");
  }
  if (this.eat(types.parenL)) { node.arguments = this.parseExprList(types.parenR, this.options.ecmaVersion >= 8, false); }
  else { node.arguments = empty$1; }
  return this.finishNode(node, "NewExpression")
};

// Parse template expression.

pp$3.parseTemplateElement = function(ref) {
  var isTagged = ref.isTagged;

  var elem = this.startNode();
  if (this.type === types.invalidTemplate) {
    if (!isTagged) {
      this.raiseRecoverable(this.start, "Bad escape sequence in untagged template literal");
    }
    elem.value = {
      raw: this.value,
      cooked: null
    };
  } else {
    elem.value = {
      raw: this.input.slice(this.start, this.end).replace(/\r\n?/g, "\n"),
      cooked: this.value
    };
  }
  this.next();
  elem.tail = this.type === types.backQuote;
  return this.finishNode(elem, "TemplateElement")
};

pp$3.parseTemplate = function(ref) {
  if ( ref === void 0 ) ref = {};
  var isTagged = ref.isTagged; if ( isTagged === void 0 ) isTagged = false;

  var node = this.startNode();
  this.next();
  node.expressions = [];
  var curElt = this.parseTemplateElement({isTagged: isTagged});
  node.quasis = [curElt];
  while (!curElt.tail) {
    if (this.type === types.eof) { this.raise(this.pos, "Unterminated template literal"); }
    this.expect(types.dollarBraceL);
    node.expressions.push(this.parseExpression());
    this.expect(types.braceR);
    node.quasis.push(curElt = this.parseTemplateElement({isTagged: isTagged}));
  }
  this.next();
  return this.finishNode(node, "TemplateLiteral")
};

pp$3.isAsyncProp = function(prop) {
  return !prop.computed && prop.key.type === "Identifier" && prop.key.name === "async" &&
    (this.type === types.name || this.type === types.num || this.type === types.string || this.type === types.bracketL || this.type.keyword || (this.options.ecmaVersion >= 9 && this.type === types.star)) &&
    !lineBreak.test(this.input.slice(this.lastTokEnd, this.start))
};

// Parse an object literal or binding pattern.

pp$3.parseObj = function(isPattern, refDestructuringErrors) {
  var node = this.startNode(), first = true, propHash = {};
  node.properties = [];
  this.next();
  while (!this.eat(types.braceR)) {
    if (!first) {
      this.expect(types.comma);
      if (this.options.ecmaVersion >= 5 && this.afterTrailingComma(types.braceR)) { break }
    } else { first = false; }

    var prop = this.parseProperty(isPattern, refDestructuringErrors);
    if (!isPattern) { this.checkPropClash(prop, propHash, refDestructuringErrors); }
    node.properties.push(prop);
  }
  return this.finishNode(node, isPattern ? "ObjectPattern" : "ObjectExpression")
};

pp$3.parseProperty = function(isPattern, refDestructuringErrors) {
  var prop = this.startNode(), isGenerator, isAsync, startPos, startLoc;
  if (this.options.ecmaVersion >= 9 && this.eat(types.ellipsis)) {
    if (isPattern) {
      prop.argument = this.parseIdent(false);
      if (this.type === types.comma) {
        this.raise(this.start, "Comma is not permitted after the rest element");
      }
      return this.finishNode(prop, "RestElement")
    }
    // To disallow parenthesized identifier via `this.toAssignable()`.
    if (this.type === types.parenL && refDestructuringErrors) {
      if (refDestructuringErrors.parenthesizedAssign < 0) {
        refDestructuringErrors.parenthesizedAssign = this.start;
      }
      if (refDestructuringErrors.parenthesizedBind < 0) {
        refDestructuringErrors.parenthesizedBind = this.start;
      }
    }
    // Parse argument.
    prop.argument = this.parseMaybeAssign(false, refDestructuringErrors);
    // To disallow trailing comma via `this.toAssignable()`.
    if (this.type === types.comma && refDestructuringErrors && refDestructuringErrors.trailingComma < 0) {
      refDestructuringErrors.trailingComma = this.start;
    }
    // Finish
    return this.finishNode(prop, "SpreadElement")
  }
  if (this.options.ecmaVersion >= 6) {
    prop.method = false;
    prop.shorthand = false;
    if (isPattern || refDestructuringErrors) {
      startPos = this.start;
      startLoc = this.startLoc;
    }
    if (!isPattern)
      { isGenerator = this.eat(types.star); }
  }
  var containsEsc = this.containsEsc;
  this.parsePropertyName(prop);
  if (!isPattern && !containsEsc && this.options.ecmaVersion >= 8 && !isGenerator && this.isAsyncProp(prop)) {
    isAsync = true;
    isGenerator = this.options.ecmaVersion >= 9 && this.eat(types.star);
    this.parsePropertyName(prop, refDestructuringErrors);
  } else {
    isAsync = false;
  }
  this.parsePropertyValue(prop, isPattern, isGenerator, isAsync, startPos, startLoc, refDestructuringErrors, containsEsc);
  return this.finishNode(prop, "Property")
};

pp$3.parsePropertyValue = function(prop, isPattern, isGenerator, isAsync, startPos, startLoc, refDestructuringErrors, containsEsc) {
  if ((isGenerator || isAsync) && this.type === types.colon)
    { this.unexpected(); }

  if (this.eat(types.colon)) {
    prop.value = isPattern ? this.parseMaybeDefault(this.start, this.startLoc) : this.parseMaybeAssign(false, refDestructuringErrors);
    prop.kind = "init";
  } else if (this.options.ecmaVersion >= 6 && this.type === types.parenL) {
    if (isPattern) { this.unexpected(); }
    prop.kind = "init";
    prop.method = true;
    prop.value = this.parseMethod(isGenerator, isAsync);
  } else if (!isPattern && !containsEsc &&
             this.options.ecmaVersion >= 5 && !prop.computed && prop.key.type === "Identifier" &&
             (prop.key.name === "get" || prop.key.name === "set") &&
             (this.type !== types.comma && this.type !== types.braceR && this.type !== types.eq)) {
    if (isGenerator || isAsync) { this.unexpected(); }
    prop.kind = prop.key.name;
    this.parsePropertyName(prop);
    prop.value = this.parseMethod(false);
    var paramCount = prop.kind === "get" ? 0 : 1;
    if (prop.value.params.length !== paramCount) {
      var start = prop.value.start;
      if (prop.kind === "get")
        { this.raiseRecoverable(start, "getter should have no params"); }
      else
        { this.raiseRecoverable(start, "setter should have exactly one param"); }
    } else {
      if (prop.kind === "set" && prop.value.params[0].type === "RestElement")
        { this.raiseRecoverable(prop.value.params[0].start, "Setter cannot use rest params"); }
    }
  } else if (this.options.ecmaVersion >= 6 && !prop.computed && prop.key.type === "Identifier") {
    if (isGenerator || isAsync) { this.unexpected(); }
    this.checkUnreserved(prop.key);
    if (prop.key.name === "await" && !this.awaitIdentPos)
      { this.awaitIdentPos = startPos; }
    prop.kind = "init";
    if (isPattern) {
      prop.value = this.parseMaybeDefault(startPos, startLoc, prop.key);
    } else if (this.type === types.eq && refDestructuringErrors) {
      if (refDestructuringErrors.shorthandAssign < 0)
        { refDestructuringErrors.shorthandAssign = this.start; }
      prop.value = this.parseMaybeDefault(startPos, startLoc, prop.key);
    } else {
      prop.value = prop.key;
    }
    prop.shorthand = true;
  } else { this.unexpected(); }
};

pp$3.parsePropertyName = function(prop) {
  if (this.options.ecmaVersion >= 6) {
    if (this.eat(types.bracketL)) {
      prop.computed = true;
      prop.key = this.parseMaybeAssign();
      this.expect(types.bracketR);
      return prop.key
    } else {
      prop.computed = false;
    }
  }
  return prop.key = this.type === types.num || this.type === types.string ? this.parseExprAtom() : this.parseIdent(this.options.allowReserved !== "never")
};

// Initialize empty function node.

pp$3.initFunction = function(node) {
  node.id = null;
  if (this.options.ecmaVersion >= 6) { node.generator = node.expression = false; }
  if (this.options.ecmaVersion >= 8) { node.async = false; }
};

// Parse object or class method.

pp$3.parseMethod = function(isGenerator, isAsync, allowDirectSuper) {
  var node = this.startNode(), oldYieldPos = this.yieldPos, oldAwaitPos = this.awaitPos, oldAwaitIdentPos = this.awaitIdentPos;

  this.initFunction(node);
  if (this.options.ecmaVersion >= 6)
    { node.generator = isGenerator; }
  if (this.options.ecmaVersion >= 8)
    { node.async = !!isAsync; }

  this.yieldPos = 0;
  this.awaitPos = 0;
  this.awaitIdentPos = 0;
  this.enterScope(functionFlags(isAsync, node.generator) | SCOPE_SUPER | (allowDirectSuper ? SCOPE_DIRECT_SUPER : 0));

  this.expect(types.parenL);
  node.params = this.parseBindingList(types.parenR, false, this.options.ecmaVersion >= 8);
  this.checkYieldAwaitInDefaultParams();
  this.parseFunctionBody(node, false, true);

  this.yieldPos = oldYieldPos;
  this.awaitPos = oldAwaitPos;
  this.awaitIdentPos = oldAwaitIdentPos;
  return this.finishNode(node, "FunctionExpression")
};

// Parse arrow function expression with given parameters.

pp$3.parseArrowExpression = function(node, params, isAsync) {
  var oldYieldPos = this.yieldPos, oldAwaitPos = this.awaitPos, oldAwaitIdentPos = this.awaitIdentPos;

  this.enterScope(functionFlags(isAsync, false) | SCOPE_ARROW);
  this.initFunction(node);
  if (this.options.ecmaVersion >= 8) { node.async = !!isAsync; }

  this.yieldPos = 0;
  this.awaitPos = 0;
  this.awaitIdentPos = 0;

  node.params = this.toAssignableList(params, true);
  this.parseFunctionBody(node, true, false);

  this.yieldPos = oldYieldPos;
  this.awaitPos = oldAwaitPos;
  this.awaitIdentPos = oldAwaitIdentPos;
  return this.finishNode(node, "ArrowFunctionExpression")
};

// Parse function body and check parameters.

pp$3.parseFunctionBody = function(node, isArrowFunction, isMethod) {
  var isExpression = isArrowFunction && this.type !== types.braceL;
  var oldStrict = this.strict, useStrict = false;

  if (isExpression) {
    node.body = this.parseMaybeAssign();
    node.expression = true;
    this.checkParams(node, false);
  } else {
    var nonSimple = this.options.ecmaVersion >= 7 && !this.isSimpleParamList(node.params);
    if (!oldStrict || nonSimple) {
      useStrict = this.strictDirective(this.end);
      // If this is a strict mode function, verify that argument names
      // are not repeated, and it does not try to bind the words `eval`
      // or `arguments`.
      if (useStrict && nonSimple)
        { this.raiseRecoverable(node.start, "Illegal 'use strict' directive in function with non-simple parameter list"); }
    }
    // Start a new scope with regard to labels and the `inFunction`
    // flag (restore them to their old value afterwards).
    var oldLabels = this.labels;
    this.labels = [];
    if (useStrict) { this.strict = true; }

    // Add the params to varDeclaredNames to ensure that an error is thrown
    // if a let/const declaration in the function clashes with one of the params.
    this.checkParams(node, !oldStrict && !useStrict && !isArrowFunction && !isMethod && this.isSimpleParamList(node.params));
    // Ensure the function name isn't a forbidden identifier in strict mode, e.g. 'eval'
    if (this.strict && node.id) { this.checkLVal(node.id, BIND_OUTSIDE); }
    node.body = this.parseBlock(false, undefined, useStrict && !oldStrict);
    node.expression = false;
    this.adaptDirectivePrologue(node.body.body);
    this.labels = oldLabels;
  }
  this.exitScope();
};

pp$3.isSimpleParamList = function(params) {
  for (var i = 0, list = params; i < list.length; i += 1)
    {
    var param = list[i];

    if (param.type !== "Identifier") { return false
  } }
  return true
};

// Checks function params for various disallowed patterns such as using "eval"
// or "arguments" and duplicate parameters.

pp$3.checkParams = function(node, allowDuplicates) {
  var nameHash = {};
  for (var i = 0, list = node.params; i < list.length; i += 1)
    {
    var param = list[i];

    this.checkLVal(param, BIND_VAR, allowDuplicates ? null : nameHash);
  }
};

// Parses a comma-separated list of expressions, and returns them as
// an array. `close` is the token type that ends the list, and
// `allowEmpty` can be turned on to allow subsequent commas with
// nothing in between them to be parsed as `null` (which is needed
// for array literals).

pp$3.parseExprList = function(close, allowTrailingComma, allowEmpty, refDestructuringErrors) {
  var elts = [], first = true;
  while (!this.eat(close)) {
    if (!first) {
      this.expect(types.comma);
      if (allowTrailingComma && this.afterTrailingComma(close)) { break }
    } else { first = false; }

    var elt = (void 0);
    if (allowEmpty && this.type === types.comma)
      { elt = null; }
    else if (this.type === types.ellipsis) {
      elt = this.parseSpread(refDestructuringErrors);
      if (refDestructuringErrors && this.type === types.comma && refDestructuringErrors.trailingComma < 0)
        { refDestructuringErrors.trailingComma = this.start; }
    } else {
      elt = this.parseMaybeAssign(false, refDestructuringErrors);
    }
    elts.push(elt);
  }
  return elts
};

pp$3.checkUnreserved = function(ref) {
  var start = ref.start;
  var end = ref.end;
  var name = ref.name;

  if (this.inGenerator && name === "yield")
    { this.raiseRecoverable(start, "Cannot use 'yield' as identifier inside a generator"); }
  if (this.inAsync && name === "await")
    { this.raiseRecoverable(start, "Cannot use 'await' as identifier inside an async function"); }
  if (this.keywords.test(name))
    { this.raise(start, ("Unexpected keyword '" + name + "'")); }
  if (this.options.ecmaVersion < 6 &&
    this.input.slice(start, end).indexOf("\\") !== -1) { return }
  var re = this.strict ? this.reservedWordsStrict : this.reservedWords;
  if (re.test(name)) {
    if (!this.inAsync && name === "await")
      { this.raiseRecoverable(start, "Cannot use keyword 'await' outside an async function"); }
    this.raiseRecoverable(start, ("The keyword '" + name + "' is reserved"));
  }
};

// Parse the next token as an identifier. If `liberal` is true (used
// when parsing properties), it will also convert keywords into
// identifiers.

pp$3.parseIdent = function(liberal, isBinding) {
  var node = this.startNode();
  if (this.type === types.name) {
    node.name = this.value;
  } else if (this.type.keyword) {
    node.name = this.type.keyword;

    // To fix https://github.com/acornjs/acorn/issues/575
    // `class` and `function` keywords push new context into this.context.
    // But there is no chance to pop the context if the keyword is consumed as an identifier such as a property name.
    // If the previous token is a dot, this does not apply because the context-managing code already ignored the keyword
    if ((node.name === "class" || node.name === "function") &&
        (this.lastTokEnd !== this.lastTokStart + 1 || this.input.charCodeAt(this.lastTokStart) !== 46)) {
      this.context.pop();
    }
  } else {
    this.unexpected();
  }
  this.next(!!liberal);
  this.finishNode(node, "Identifier");
  if (!liberal) {
    this.checkUnreserved(node);
    if (node.name === "await" && !this.awaitIdentPos)
      { this.awaitIdentPos = node.start; }
  }
  return node
};

// Parses yield expression inside generator.

pp$3.parseYield = function(noIn) {
  if (!this.yieldPos) { this.yieldPos = this.start; }

  var node = this.startNode();
  this.next();
  if (this.type === types.semi || this.canInsertSemicolon() || (this.type !== types.star && !this.type.startsExpr)) {
    node.delegate = false;
    node.argument = null;
  } else {
    node.delegate = this.eat(types.star);
    node.argument = this.parseMaybeAssign(noIn);
  }
  return this.finishNode(node, "YieldExpression")
};

pp$3.parseAwait = function() {
  if (!this.awaitPos) { this.awaitPos = this.start; }

  var node = this.startNode();
  this.next();
  node.argument = this.parseMaybeUnary(null, false);
  return this.finishNode(node, "AwaitExpression")
};

var pp$4 = Parser.prototype;

// This function is used to raise exceptions on parse errors. It
// takes an offset integer (into the current `input`) to indicate
// the location of the error, attaches the position to the end
// of the error message, and then raises a `SyntaxError` with that
// message.

pp$4.raise = function(pos, message) {
  var loc = getLineInfo(this.input, pos);
  message += " (" + loc.line + ":" + loc.column + ")";
  var err = new SyntaxError(message);
  err.pos = pos; err.loc = loc; err.raisedAt = this.pos;
  throw err
};

pp$4.raiseRecoverable = pp$4.raise;

pp$4.curPosition = function() {
  if (this.options.locations) {
    return new Position(this.curLine, this.pos - this.lineStart)
  }
};

var pp$5 = Parser.prototype;

var Scope = function Scope(flags) {
  this.flags = flags;
  // A list of var-declared names in the current lexical scope
  this.var = [];
  // A list of lexically-declared names in the current lexical scope
  this.lexical = [];
  // A list of lexically-declared FunctionDeclaration names in the current lexical scope
  this.functions = [];
};

// The functions in this module keep track of declared variables in the current scope in order to detect duplicate variable names.

pp$5.enterScope = function(flags) {
  this.scopeStack.push(new Scope(flags));
};

pp$5.exitScope = function() {
  this.scopeStack.pop();
};

// The spec says:
// > At the top level of a function, or script, function declarations are
// > treated like var declarations rather than like lexical declarations.
pp$5.treatFunctionsAsVarInScope = function(scope) {
  return (scope.flags & SCOPE_FUNCTION) || !this.inModule && (scope.flags & SCOPE_TOP)
};

pp$5.declareName = function(name, bindingType, pos) {
  var redeclared = false;
  if (bindingType === BIND_LEXICAL) {
    var scope = this.currentScope();
    redeclared = scope.lexical.indexOf(name) > -1 || scope.functions.indexOf(name) > -1 || scope.var.indexOf(name) > -1;
    scope.lexical.push(name);
    if (this.inModule && (scope.flags & SCOPE_TOP))
      { delete this.undefinedExports[name]; }
  } else if (bindingType === BIND_SIMPLE_CATCH) {
    var scope$1 = this.currentScope();
    scope$1.lexical.push(name);
  } else if (bindingType === BIND_FUNCTION) {
    var scope$2 = this.currentScope();
    if (this.treatFunctionsAsVar)
      { redeclared = scope$2.lexical.indexOf(name) > -1; }
    else
      { redeclared = scope$2.lexical.indexOf(name) > -1 || scope$2.var.indexOf(name) > -1; }
    scope$2.functions.push(name);
  } else {
    for (var i = this.scopeStack.length - 1; i >= 0; --i) {
      var scope$3 = this.scopeStack[i];
      if (scope$3.lexical.indexOf(name) > -1 && !((scope$3.flags & SCOPE_SIMPLE_CATCH) && scope$3.lexical[0] === name) ||
          !this.treatFunctionsAsVarInScope(scope$3) && scope$3.functions.indexOf(name) > -1) {
        redeclared = true;
        break
      }
      scope$3.var.push(name);
      if (this.inModule && (scope$3.flags & SCOPE_TOP))
        { delete this.undefinedExports[name]; }
      if (scope$3.flags & SCOPE_VAR) { break }
    }
  }
  if (redeclared) { this.raiseRecoverable(pos, ("Identifier '" + name + "' has already been declared")); }
};

pp$5.checkLocalExport = function(id) {
  // scope.functions must be empty as Module code is always strict.
  if (this.scopeStack[0].lexical.indexOf(id.name) === -1 &&
      this.scopeStack[0].var.indexOf(id.name) === -1) {
    this.undefinedExports[id.name] = id;
  }
};

pp$5.currentScope = function() {
  return this.scopeStack[this.scopeStack.length - 1]
};

pp$5.currentVarScope = function() {
  for (var i = this.scopeStack.length - 1;; i--) {
    var scope = this.scopeStack[i];
    if (scope.flags & SCOPE_VAR) { return scope }
  }
};

// Could be useful for `this`, `new.target`, `super()`, `super.property`, and `super[property]`.
pp$5.currentThisScope = function() {
  for (var i = this.scopeStack.length - 1;; i--) {
    var scope = this.scopeStack[i];
    if (scope.flags & SCOPE_VAR && !(scope.flags & SCOPE_ARROW)) { return scope }
  }
};

var Node = function Node(parser, pos, loc) {
  this.type = "";
  this.start = pos;
  this.end = 0;
  if (parser.options.locations)
    { this.loc = new SourceLocation(parser, loc); }
  if (parser.options.directSourceFile)
    { this.sourceFile = parser.options.directSourceFile; }
  if (parser.options.ranges)
    { this.range = [pos, 0]; }
};

// Start an AST node, attaching a start offset.

var pp$6 = Parser.prototype;

pp$6.startNode = function() {
  return new Node(this, this.start, this.startLoc)
};

pp$6.startNodeAt = function(pos, loc) {
  return new Node(this, pos, loc)
};

// Finish an AST node, adding `type` and `end` properties.

function finishNodeAt(node, type, pos, loc) {
  node.type = type;
  node.end = pos;
  if (this.options.locations)
    { node.loc.end = loc; }
  if (this.options.ranges)
    { node.range[1] = pos; }
  return node
}

pp$6.finishNode = function(node, type) {
  return finishNodeAt.call(this, node, type, this.lastTokEnd, this.lastTokEndLoc)
};

// Finish node at given position

pp$6.finishNodeAt = function(node, type, pos, loc) {
  return finishNodeAt.call(this, node, type, pos, loc)
};

// The algorithm used to determine whether a regexp can appear at a

var TokContext = function TokContext(token, isExpr, preserveSpace, override, generator) {
  this.token = token;
  this.isExpr = !!isExpr;
  this.preserveSpace = !!preserveSpace;
  this.override = override;
  this.generator = !!generator;
};

var types$1 = {
  b_stat: new TokContext("{", false),
  b_expr: new TokContext("{", true),
  b_tmpl: new TokContext("${", false),
  p_stat: new TokContext("(", false),
  p_expr: new TokContext("(", true),
  q_tmpl: new TokContext("`", true, true, function (p) { return p.tryReadTemplateToken(); }),
  f_stat: new TokContext("function", false),
  f_expr: new TokContext("function", true),
  f_expr_gen: new TokContext("function", true, false, null, true),
  f_gen: new TokContext("function", false, false, null, true)
};

var pp$7 = Parser.prototype;

pp$7.initialContext = function() {
  return [types$1.b_stat]
};

pp$7.braceIsBlock = function(prevType) {
  var parent = this.curContext();
  if (parent === types$1.f_expr || parent === types$1.f_stat)
    { return true }
  if (prevType === types.colon && (parent === types$1.b_stat || parent === types$1.b_expr))
    { return !parent.isExpr }

  // The check for `tt.name && exprAllowed` detects whether we are
  // after a `yield` or `of` construct. See the `updateContext` for
  // `tt.name`.
  if (prevType === types._return || prevType === types.name && this.exprAllowed)
    { return lineBreak.test(this.input.slice(this.lastTokEnd, this.start)) }
  if (prevType === types._else || prevType === types.semi || prevType === types.eof || prevType === types.parenR || prevType === types.arrow)
    { return true }
  if (prevType === types.braceL)
    { return parent === types$1.b_stat }
  if (prevType === types._var || prevType === types._const || prevType === types.name)
    { return false }
  return !this.exprAllowed
};

pp$7.inGeneratorContext = function() {
  for (var i = this.context.length - 1; i >= 1; i--) {
    var context = this.context[i];
    if (context.token === "function")
      { return context.generator }
  }
  return false
};

pp$7.updateContext = function(prevType) {
  var update, type = this.type;
  if (type.keyword && prevType === types.dot)
    { this.exprAllowed = false; }
  else if (update = type.updateContext)
    { update.call(this, prevType); }
  else
    { this.exprAllowed = type.beforeExpr; }
};

// Token-specific context update code

types.parenR.updateContext = types.braceR.updateContext = function() {
  if (this.context.length === 1) {
    this.exprAllowed = true;
    return
  }
  var out = this.context.pop();
  if (out === types$1.b_stat && this.curContext().token === "function") {
    out = this.context.pop();
  }
  this.exprAllowed = !out.isExpr;
};

types.braceL.updateContext = function(prevType) {
  this.context.push(this.braceIsBlock(prevType) ? types$1.b_stat : types$1.b_expr);
  this.exprAllowed = true;
};

types.dollarBraceL.updateContext = function() {
  this.context.push(types$1.b_tmpl);
  this.exprAllowed = true;
};

types.parenL.updateContext = function(prevType) {
  var statementParens = prevType === types._if || prevType === types._for || prevType === types._with || prevType === types._while;
  this.context.push(statementParens ? types$1.p_stat : types$1.p_expr);
  this.exprAllowed = true;
};

types.incDec.updateContext = function() {
  // tokExprAllowed stays unchanged
};

types._function.updateContext = types._class.updateContext = function(prevType) {
  if (prevType.beforeExpr && prevType !== types.semi && prevType !== types._else &&
      !(prevType === types._return && lineBreak.test(this.input.slice(this.lastTokEnd, this.start))) &&
      !((prevType === types.colon || prevType === types.braceL) && this.curContext() === types$1.b_stat))
    { this.context.push(types$1.f_expr); }
  else
    { this.context.push(types$1.f_stat); }
  this.exprAllowed = false;
};

types.backQuote.updateContext = function() {
  if (this.curContext() === types$1.q_tmpl)
    { this.context.pop(); }
  else
    { this.context.push(types$1.q_tmpl); }
  this.exprAllowed = false;
};

types.star.updateContext = function(prevType) {
  if (prevType === types._function) {
    var index = this.context.length - 1;
    if (this.context[index] === types$1.f_expr)
      { this.context[index] = types$1.f_expr_gen; }
    else
      { this.context[index] = types$1.f_gen; }
  }
  this.exprAllowed = true;
};

types.name.updateContext = function(prevType) {
  var allowed = false;
  if (this.options.ecmaVersion >= 6 && prevType !== types.dot) {
    if (this.value === "of" && !this.exprAllowed ||
        this.value === "yield" && this.inGeneratorContext())
      { allowed = true; }
  }
  this.exprAllowed = allowed;
};

// This file contains Unicode properties extracted from the ECMAScript
// specification. The lists are extracted like so:
// $$('#table-binary-unicode-properties > figure > table > tbody > tr > td:nth-child(1) code').map(el => el.innerText)

// #table-binary-unicode-properties
var ecma9BinaryProperties = "ASCII ASCII_Hex_Digit AHex Alphabetic Alpha Any Assigned Bidi_Control Bidi_C Bidi_Mirrored Bidi_M Case_Ignorable CI Cased Changes_When_Casefolded CWCF Changes_When_Casemapped CWCM Changes_When_Lowercased CWL Changes_When_NFKC_Casefolded CWKCF Changes_When_Titlecased CWT Changes_When_Uppercased CWU Dash Default_Ignorable_Code_Point DI Deprecated Dep Diacritic Dia Emoji Emoji_Component Emoji_Modifier Emoji_Modifier_Base Emoji_Presentation Extender Ext Grapheme_Base Gr_Base Grapheme_Extend Gr_Ext Hex_Digit Hex IDS_Binary_Operator IDSB IDS_Trinary_Operator IDST ID_Continue IDC ID_Start IDS Ideographic Ideo Join_Control Join_C Logical_Order_Exception LOE Lowercase Lower Math Noncharacter_Code_Point NChar Pattern_Syntax Pat_Syn Pattern_White_Space Pat_WS Quotation_Mark QMark Radical Regional_Indicator RI Sentence_Terminal STerm Soft_Dotted SD Terminal_Punctuation Term Unified_Ideograph UIdeo Uppercase Upper Variation_Selector VS White_Space space XID_Continue XIDC XID_Start XIDS";
var ecma10BinaryProperties = ecma9BinaryProperties + " Extended_Pictographic";
var ecma11BinaryProperties = ecma10BinaryProperties;
var unicodeBinaryProperties = {
  9: ecma9BinaryProperties,
  10: ecma10BinaryProperties,
  11: ecma11BinaryProperties
};

// #table-unicode-general-category-values
var unicodeGeneralCategoryValues = "Cased_Letter LC Close_Punctuation Pe Connector_Punctuation Pc Control Cc cntrl Currency_Symbol Sc Dash_Punctuation Pd Decimal_Number Nd digit Enclosing_Mark Me Final_Punctuation Pf Format Cf Initial_Punctuation Pi Letter L Letter_Number Nl Line_Separator Zl Lowercase_Letter Ll Mark M Combining_Mark Math_Symbol Sm Modifier_Letter Lm Modifier_Symbol Sk Nonspacing_Mark Mn Number N Open_Punctuation Ps Other C Other_Letter Lo Other_Number No Other_Punctuation Po Other_Symbol So Paragraph_Separator Zp Private_Use Co Punctuation P punct Separator Z Space_Separator Zs Spacing_Mark Mc Surrogate Cs Symbol S Titlecase_Letter Lt Unassigned Cn Uppercase_Letter Lu";

// #table-unicode-script-values
var ecma9ScriptValues = "Adlam Adlm Ahom Ahom Anatolian_Hieroglyphs Hluw Arabic Arab Armenian Armn Avestan Avst Balinese Bali Bamum Bamu Bassa_Vah Bass Batak Batk Bengali Beng Bhaiksuki Bhks Bopomofo Bopo Brahmi Brah Braille Brai Buginese Bugi Buhid Buhd Canadian_Aboriginal Cans Carian Cari Caucasian_Albanian Aghb Chakma Cakm Cham Cham Cherokee Cher Common Zyyy Coptic Copt Qaac Cuneiform Xsux Cypriot Cprt Cyrillic Cyrl Deseret Dsrt Devanagari Deva Duployan Dupl Egyptian_Hieroglyphs Egyp Elbasan Elba Ethiopic Ethi Georgian Geor Glagolitic Glag Gothic Goth Grantha Gran Greek Grek Gujarati Gujr Gurmukhi Guru Han Hani Hangul Hang Hanunoo Hano Hatran Hatr Hebrew Hebr Hiragana Hira Imperial_Aramaic Armi Inherited Zinh Qaai Inscriptional_Pahlavi Phli Inscriptional_Parthian Prti Javanese Java Kaithi Kthi Kannada Knda Katakana Kana Kayah_Li Kali Kharoshthi Khar Khmer Khmr Khojki Khoj Khudawadi Sind Lao Laoo Latin Latn Lepcha Lepc Limbu Limb Linear_A Lina Linear_B Linb Lisu Lisu Lycian Lyci Lydian Lydi Mahajani Mahj Malayalam Mlym Mandaic Mand Manichaean Mani Marchen Marc Masaram_Gondi Gonm Meetei_Mayek Mtei Mende_Kikakui Mend Meroitic_Cursive Merc Meroitic_Hieroglyphs Mero Miao Plrd Modi Modi Mongolian Mong Mro Mroo Multani Mult Myanmar Mymr Nabataean Nbat New_Tai_Lue Talu Newa Newa Nko Nkoo Nushu Nshu Ogham Ogam Ol_Chiki Olck Old_Hungarian Hung Old_Italic Ital Old_North_Arabian Narb Old_Permic Perm Old_Persian Xpeo Old_South_Arabian Sarb Old_Turkic Orkh Oriya Orya Osage Osge Osmanya Osma Pahawh_Hmong Hmng Palmyrene Palm Pau_Cin_Hau Pauc Phags_Pa Phag Phoenician Phnx Psalter_Pahlavi Phlp Rejang Rjng Runic Runr Samaritan Samr Saurashtra Saur Sharada Shrd Shavian Shaw Siddham Sidd SignWriting Sgnw Sinhala Sinh Sora_Sompeng Sora Soyombo Soyo Sundanese Sund Syloti_Nagri Sylo Syriac Syrc Tagalog Tglg Tagbanwa Tagb Tai_Le Tale Tai_Tham Lana Tai_Viet Tavt Takri Takr Tamil Taml Tangut Tang Telugu Telu Thaana Thaa Thai Thai Tibetan Tibt Tifinagh Tfng Tirhuta Tirh Ugaritic Ugar Vai Vaii Warang_Citi Wara Yi Yiii Zanabazar_Square Zanb";
var ecma10ScriptValues = ecma9ScriptValues + " Dogra Dogr Gunjala_Gondi Gong Hanifi_Rohingya Rohg Makasar Maka Medefaidrin Medf Old_Sogdian Sogo Sogdian Sogd";
var ecma11ScriptValues = ecma10ScriptValues + " Elymaic Elym Nandinagari Nand Nyiakeng_Puachue_Hmong Hmnp Wancho Wcho";
var unicodeScriptValues = {
  9: ecma9ScriptValues,
  10: ecma10ScriptValues,
  11: ecma11ScriptValues
};

var data = {};
function buildUnicodeData(ecmaVersion) {
  var d = data[ecmaVersion] = {
    binary: wordsRegexp(unicodeBinaryProperties[ecmaVersion] + " " + unicodeGeneralCategoryValues),
    nonBinary: {
      General_Category: wordsRegexp(unicodeGeneralCategoryValues),
      Script: wordsRegexp(unicodeScriptValues[ecmaVersion])
    }
  };
  d.nonBinary.Script_Extensions = d.nonBinary.Script;

  d.nonBinary.gc = d.nonBinary.General_Category;
  d.nonBinary.sc = d.nonBinary.Script;
  d.nonBinary.scx = d.nonBinary.Script_Extensions;
}
buildUnicodeData(9);
buildUnicodeData(10);
buildUnicodeData(11);

var pp$8 = Parser.prototype;

var RegExpValidationState = function RegExpValidationState(parser) {
  this.parser = parser;
  this.validFlags = "gim" + (parser.options.ecmaVersion >= 6 ? "uy" : "") + (parser.options.ecmaVersion >= 9 ? "s" : "");
  this.unicodeProperties = data[parser.options.ecmaVersion >= 11 ? 11 : parser.options.ecmaVersion];
  this.source = "";
  this.flags = "";
  this.start = 0;
  this.switchU = false;
  this.switchN = false;
  this.pos = 0;
  this.lastIntValue = 0;
  this.lastStringValue = "";
  this.lastAssertionIsQuantifiable = false;
  this.numCapturingParens = 0;
  this.maxBackReference = 0;
  this.groupNames = [];
  this.backReferenceNames = [];
};

RegExpValidationState.prototype.reset = function reset (start, pattern, flags) {
  var unicode = flags.indexOf("u") !== -1;
  this.start = start | 0;
  this.source = pattern + "";
  this.flags = flags;
  this.switchU = unicode && this.parser.options.ecmaVersion >= 6;
  this.switchN = unicode && this.parser.options.ecmaVersion >= 9;
};

RegExpValidationState.prototype.raise = function raise (message) {
  this.parser.raiseRecoverable(this.start, ("Invalid regular expression: /" + (this.source) + "/: " + message));
};

// If u flag is given, this returns the code point at the index (it combines a surrogate pair).
// Otherwise, this returns the code unit of the index (can be a part of a surrogate pair).
RegExpValidationState.prototype.at = function at (i, forceU) {
    if ( forceU === void 0 ) forceU = false;

  var s = this.source;
  var l = s.length;
  if (i >= l) {
    return -1
  }
  var c = s.charCodeAt(i);
  if (!(forceU || this.switchU) || c <= 0xD7FF || c >= 0xE000 || i + 1 >= l) {
    return c
  }
  var next = s.charCodeAt(i + 1);
  return next >= 0xDC00 && next <= 0xDFFF ? (c << 10) + next - 0x35FDC00 : c
};

RegExpValidationState.prototype.nextIndex = function nextIndex (i, forceU) {
    if ( forceU === void 0 ) forceU = false;

  var s = this.source;
  var l = s.length;
  if (i >= l) {
    return l
  }
  var c = s.charCodeAt(i), next;
  if (!(forceU || this.switchU) || c <= 0xD7FF || c >= 0xE000 || i + 1 >= l ||
      (next = s.charCodeAt(i + 1)) < 0xDC00 || next > 0xDFFF) {
    return i + 1
  }
  return i + 2
};

RegExpValidationState.prototype.current = function current (forceU) {
    if ( forceU === void 0 ) forceU = false;

  return this.at(this.pos, forceU)
};

RegExpValidationState.prototype.lookahead = function lookahead (forceU) {
    if ( forceU === void 0 ) forceU = false;

  return this.at(this.nextIndex(this.pos, forceU), forceU)
};

RegExpValidationState.prototype.advance = function advance (forceU) {
    if ( forceU === void 0 ) forceU = false;

  this.pos = this.nextIndex(this.pos, forceU);
};

RegExpValidationState.prototype.eat = function eat (ch, forceU) {
    if ( forceU === void 0 ) forceU = false;

  if (this.current(forceU) === ch) {
    this.advance(forceU);
    return true
  }
  return false
};

function codePointToString(ch) {
  if (ch <= 0xFFFF) { return String.fromCharCode(ch) }
  ch -= 0x10000;
  return String.fromCharCode((ch >> 10) + 0xD800, (ch & 0x03FF) + 0xDC00)
}

/**
 * Validate the flags part of a given RegExpLiteral.
 *
 * @param {RegExpValidationState} state The state to validate RegExp.
 * @returns {void}
 */
pp$8.validateRegExpFlags = function(state) {
  var validFlags = state.validFlags;
  var flags = state.flags;

  for (var i = 0; i < flags.length; i++) {
    var flag = flags.charAt(i);
    if (validFlags.indexOf(flag) === -1) {
      this.raise(state.start, "Invalid regular expression flag");
    }
    if (flags.indexOf(flag, i + 1) > -1) {
      this.raise(state.start, "Duplicate regular expression flag");
    }
  }
};

/**
 * Validate the pattern part of a given RegExpLiteral.
 *
 * @param {RegExpValidationState} state The state to validate RegExp.
 * @returns {void}
 */
pp$8.validateRegExpPattern = function(state) {
  this.regexp_pattern(state);

  // The goal symbol for the parse is |Pattern[~U, ~N]|. If the result of
  // parsing contains a |GroupName|, reparse with the goal symbol
  // |Pattern[~U, +N]| and use this result instead. Throw a *SyntaxError*
  // exception if _P_ did not conform to the grammar, if any elements of _P_
  // were not matched by the parse, or if any Early Error conditions exist.
  if (!state.switchN && this.options.ecmaVersion >= 9 && state.groupNames.length > 0) {
    state.switchN = true;
    this.regexp_pattern(state);
  }
};

// https://www.ecma-international.org/ecma-262/8.0/#prod-Pattern
pp$8.regexp_pattern = function(state) {
  state.pos = 0;
  state.lastIntValue = 0;
  state.lastStringValue = "";
  state.lastAssertionIsQuantifiable = false;
  state.numCapturingParens = 0;
  state.maxBackReference = 0;
  state.groupNames.length = 0;
  state.backReferenceNames.length = 0;

  this.regexp_disjunction(state);

  if (state.pos !== state.source.length) {
    // Make the same messages as V8.
    if (state.eat(0x29 /* ) */)) {
      state.raise("Unmatched ')'");
    }
    if (state.eat(0x5D /* ] */) || state.eat(0x7D /* } */)) {
      state.raise("Lone quantifier brackets");
    }
  }
  if (state.maxBackReference > state.numCapturingParens) {
    state.raise("Invalid escape");
  }
  for (var i = 0, list = state.backReferenceNames; i < list.length; i += 1) {
    var name = list[i];

    if (state.groupNames.indexOf(name) === -1) {
      state.raise("Invalid named capture referenced");
    }
  }
};

// https://www.ecma-international.org/ecma-262/8.0/#prod-Disjunction
pp$8.regexp_disjunction = function(state) {
  this.regexp_alternative(state);
  while (state.eat(0x7C /* | */)) {
    this.regexp_alternative(state);
  }

  // Make the same message as V8.
  if (this.regexp_eatQuantifier(state, true)) {
    state.raise("Nothing to repeat");
  }
  if (state.eat(0x7B /* { */)) {
    state.raise("Lone quantifier brackets");
  }
};

// https://www.ecma-international.org/ecma-262/8.0/#prod-Alternative
pp$8.regexp_alternative = function(state) {
  while (state.pos < state.source.length && this.regexp_eatTerm(state))
    { }
};

// https://www.ecma-international.org/ecma-262/8.0/#prod-annexB-Term
pp$8.regexp_eatTerm = function(state) {
  if (this.regexp_eatAssertion(state)) {
    // Handle `QuantifiableAssertion Quantifier` alternative.
    // `state.lastAssertionIsQuantifiable` is true if the last eaten Assertion
    // is a QuantifiableAssertion.
    if (state.lastAssertionIsQuantifiable && this.regexp_eatQuantifier(state)) {
      // Make the same message as V8.
      if (state.switchU) {
        state.raise("Invalid quantifier");
      }
    }
    return true
  }

  if (state.switchU ? this.regexp_eatAtom(state) : this.regexp_eatExtendedAtom(state)) {
    this.regexp_eatQuantifier(state);
    return true
  }

  return false
};

// https://www.ecma-international.org/ecma-262/8.0/#prod-annexB-Assertion
pp$8.regexp_eatAssertion = function(state) {
  var start = state.pos;
  state.lastAssertionIsQuantifiable = false;

  // ^, $
  if (state.eat(0x5E /* ^ */) || state.eat(0x24 /* $ */)) {
    return true
  }

  // \b \B
  if (state.eat(0x5C /* \ */)) {
    if (state.eat(0x42 /* B */) || state.eat(0x62 /* b */)) {
      return true
    }
    state.pos = start;
  }

  // Lookahead / Lookbehind
  if (state.eat(0x28 /* ( */) && state.eat(0x3F /* ? */)) {
    var lookbehind = false;
    if (this.options.ecmaVersion >= 9) {
      lookbehind = state.eat(0x3C /* < */);
    }
    if (state.eat(0x3D /* = */) || state.eat(0x21 /* ! */)) {
      this.regexp_disjunction(state);
      if (!state.eat(0x29 /* ) */)) {
        state.raise("Unterminated group");
      }
      state.lastAssertionIsQuantifiable = !lookbehind;
      return true
    }
  }

  state.pos = start;
  return false
};

// https://www.ecma-international.org/ecma-262/8.0/#prod-Quantifier
pp$8.regexp_eatQuantifier = function(state, noError) {
  if ( noError === void 0 ) noError = false;

  if (this.regexp_eatQuantifierPrefix(state, noError)) {
    state.eat(0x3F /* ? */);
    return true
  }
  return false
};

// https://www.ecma-international.org/ecma-262/8.0/#prod-QuantifierPrefix
pp$8.regexp_eatQuantifierPrefix = function(state, noError) {
  return (
    state.eat(0x2A /* * */) ||
    state.eat(0x2B /* + */) ||
    state.eat(0x3F /* ? */) ||
    this.regexp_eatBracedQuantifier(state, noError)
  )
};
pp$8.regexp_eatBracedQuantifier = function(state, noError) {
  var start = state.pos;
  if (state.eat(0x7B /* { */)) {
    var min = 0, max = -1;
    if (this.regexp_eatDecimalDigits(state)) {
      min = state.lastIntValue;
      if (state.eat(0x2C /* , */) && this.regexp_eatDecimalDigits(state)) {
        max = state.lastIntValue;
      }
      if (state.eat(0x7D /* } */)) {
        // SyntaxError in https://www.ecma-international.org/ecma-262/8.0/#sec-term
        if (max !== -1 && max < min && !noError) {
          state.raise("numbers out of order in {} quantifier");
        }
        return true
      }
    }
    if (state.switchU && !noError) {
      state.raise("Incomplete quantifier");
    }
    state.pos = start;
  }
  return false
};

// https://www.ecma-international.org/ecma-262/8.0/#prod-Atom
pp$8.regexp_eatAtom = function(state) {
  return (
    this.regexp_eatPatternCharacters(state) ||
    state.eat(0x2E /* . */) ||
    this.regexp_eatReverseSolidusAtomEscape(state) ||
    this.regexp_eatCharacterClass(state) ||
    this.regexp_eatUncapturingGroup(state) ||
    this.regexp_eatCapturingGroup(state)
  )
};
pp$8.regexp_eatReverseSolidusAtomEscape = function(state) {
  var start = state.pos;
  if (state.eat(0x5C /* \ */)) {
    if (this.regexp_eatAtomEscape(state)) {
      return true
    }
    state.pos = start;
  }
  return false
};
pp$8.regexp_eatUncapturingGroup = function(state) {
  var start = state.pos;
  if (state.eat(0x28 /* ( */)) {
    if (state.eat(0x3F /* ? */) && state.eat(0x3A /* : */)) {
      this.regexp_disjunction(state);
      if (state.eat(0x29 /* ) */)) {
        return true
      }
      state.raise("Unterminated group");
    }
    state.pos = start;
  }
  return false
};
pp$8.regexp_eatCapturingGroup = function(state) {
  if (state.eat(0x28 /* ( */)) {
    if (this.options.ecmaVersion >= 9) {
      this.regexp_groupSpecifier(state);
    } else if (state.current() === 0x3F /* ? */) {
      state.raise("Invalid group");
    }
    this.regexp_disjunction(state);
    if (state.eat(0x29 /* ) */)) {
      state.numCapturingParens += 1;
      return true
    }
    state.raise("Unterminated group");
  }
  return false
};

// https://www.ecma-international.org/ecma-262/8.0/#prod-annexB-ExtendedAtom
pp$8.regexp_eatExtendedAtom = function(state) {
  return (
    state.eat(0x2E /* . */) ||
    this.regexp_eatReverseSolidusAtomEscape(state) ||
    this.regexp_eatCharacterClass(state) ||
    this.regexp_eatUncapturingGroup(state) ||
    this.regexp_eatCapturingGroup(state) ||
    this.regexp_eatInvalidBracedQuantifier(state) ||
    this.regexp_eatExtendedPatternCharacter(state)
  )
};

// https://www.ecma-international.org/ecma-262/8.0/#prod-annexB-InvalidBracedQuantifier
pp$8.regexp_eatInvalidBracedQuantifier = function(state) {
  if (this.regexp_eatBracedQuantifier(state, true)) {
    state.raise("Nothing to repeat");
  }
  return false
};

// https://www.ecma-international.org/ecma-262/8.0/#prod-SyntaxCharacter
pp$8.regexp_eatSyntaxCharacter = function(state) {
  var ch = state.current();
  if (isSyntaxCharacter(ch)) {
    state.lastIntValue = ch;
    state.advance();
    return true
  }
  return false
};
function isSyntaxCharacter(ch) {
  return (
    ch === 0x24 /* $ */ ||
    ch >= 0x28 /* ( */ && ch <= 0x2B /* + */ ||
    ch === 0x2E /* . */ ||
    ch === 0x3F /* ? */ ||
    ch >= 0x5B /* [ */ && ch <= 0x5E /* ^ */ ||
    ch >= 0x7B /* { */ && ch <= 0x7D /* } */
  )
}

// https://www.ecma-international.org/ecma-262/8.0/#prod-PatternCharacter
// But eat eager.
pp$8.regexp_eatPatternCharacters = function(state) {
  var start = state.pos;
  var ch = 0;
  while ((ch = state.current()) !== -1 && !isSyntaxCharacter(ch)) {
    state.advance();
  }
  return state.pos !== start
};

// https://www.ecma-international.org/ecma-262/8.0/#prod-annexB-ExtendedPatternCharacter
pp$8.regexp_eatExtendedPatternCharacter = function(state) {
  var ch = state.current();
  if (
    ch !== -1 &&
    ch !== 0x24 /* $ */ &&
    !(ch >= 0x28 /* ( */ && ch <= 0x2B /* + */) &&
    ch !== 0x2E /* . */ &&
    ch !== 0x3F /* ? */ &&
    ch !== 0x5B /* [ */ &&
    ch !== 0x5E /* ^ */ &&
    ch !== 0x7C /* | */
  ) {
    state.advance();
    return true
  }
  return false
};

// GroupSpecifier ::
//   [empty]
//   `?` GroupName
pp$8.regexp_groupSpecifier = function(state) {
  if (state.eat(0x3F /* ? */)) {
    if (this.regexp_eatGroupName(state)) {
      if (state.groupNames.indexOf(state.lastStringValue) !== -1) {
        state.raise("Duplicate capture group name");
      }
      state.groupNames.push(state.lastStringValue);
      return
    }
    state.raise("Invalid group");
  }
};

// GroupName ::
//   `<` RegExpIdentifierName `>`
// Note: this updates `state.lastStringValue` property with the eaten name.
pp$8.regexp_eatGroupName = function(state) {
  state.lastStringValue = "";
  if (state.eat(0x3C /* < */)) {
    if (this.regexp_eatRegExpIdentifierName(state) && state.eat(0x3E /* > */)) {
      return true
    }
    state.raise("Invalid capture group name");
  }
  return false
};

// RegExpIdentifierName ::
//   RegExpIdentifierStart
//   RegExpIdentifierName RegExpIdentifierPart
// Note: this updates `state.lastStringValue` property with the eaten name.
pp$8.regexp_eatRegExpIdentifierName = function(state) {
  state.lastStringValue = "";
  if (this.regexp_eatRegExpIdentifierStart(state)) {
    state.lastStringValue += codePointToString(state.lastIntValue);
    while (this.regexp_eatRegExpIdentifierPart(state)) {
      state.lastStringValue += codePointToString(state.lastIntValue);
    }
    return true
  }
  return false
};

// RegExpIdentifierStart ::
//   UnicodeIDStart
//   `$`
//   `_`
//   `\` RegExpUnicodeEscapeSequence[+U]
pp$8.regexp_eatRegExpIdentifierStart = function(state) {
  var start = state.pos;
  var forceU = this.options.ecmaVersion >= 11;
  var ch = state.current(forceU);
  state.advance(forceU);

  if (ch === 0x5C /* \ */ && this.regexp_eatRegExpUnicodeEscapeSequence(state, forceU)) {
    ch = state.lastIntValue;
  }
  if (isRegExpIdentifierStart(ch)) {
    state.lastIntValue = ch;
    return true
  }

  state.pos = start;
  return false
};
function isRegExpIdentifierStart(ch) {
  return isIdentifierStart(ch, true) || ch === 0x24 /* $ */ || ch === 0x5F /* _ */
}

// RegExpIdentifierPart ::
//   UnicodeIDContinue
//   `$`
//   `_`
//   `\` RegExpUnicodeEscapeSequence[+U]
//   <ZWNJ>
//   <ZWJ>
pp$8.regexp_eatRegExpIdentifierPart = function(state) {
  var start = state.pos;
  var forceU = this.options.ecmaVersion >= 11;
  var ch = state.current(forceU);
  state.advance(forceU);

  if (ch === 0x5C /* \ */ && this.regexp_eatRegExpUnicodeEscapeSequence(state, forceU)) {
    ch = state.lastIntValue;
  }
  if (isRegExpIdentifierPart(ch)) {
    state.lastIntValue = ch;
    return true
  }

  state.pos = start;
  return false
};
function isRegExpIdentifierPart(ch) {
  return isIdentifierChar(ch, true) || ch === 0x24 /* $ */ || ch === 0x5F /* _ */ || ch === 0x200C /* <ZWNJ> */ || ch === 0x200D /* <ZWJ> */
}

// https://www.ecma-international.org/ecma-262/8.0/#prod-annexB-AtomEscape
pp$8.regexp_eatAtomEscape = function(state) {
  if (
    this.regexp_eatBackReference(state) ||
    this.regexp_eatCharacterClassEscape(state) ||
    this.regexp_eatCharacterEscape(state) ||
    (state.switchN && this.regexp_eatKGroupName(state))
  ) {
    return true
  }
  if (state.switchU) {
    // Make the same message as V8.
    if (state.current() === 0x63 /* c */) {
      state.raise("Invalid unicode escape");
    }
    state.raise("Invalid escape");
  }
  return false
};
pp$8.regexp_eatBackReference = function(state) {
  var start = state.pos;
  if (this.regexp_eatDecimalEscape(state)) {
    var n = state.lastIntValue;
    if (state.switchU) {
      // For SyntaxError in https://www.ecma-international.org/ecma-262/8.0/#sec-atomescape
      if (n > state.maxBackReference) {
        state.maxBackReference = n;
      }
      return true
    }
    if (n <= state.numCapturingParens) {
      return true
    }
    state.pos = start;
  }
  return false
};
pp$8.regexp_eatKGroupName = function(state) {
  if (state.eat(0x6B /* k */)) {
    if (this.regexp_eatGroupName(state)) {
      state.backReferenceNames.push(state.lastStringValue);
      return true
    }
    state.raise("Invalid named reference");
  }
  return false
};

// https://www.ecma-international.org/ecma-262/8.0/#prod-annexB-CharacterEscape
pp$8.regexp_eatCharacterEscape = function(state) {
  return (
    this.regexp_eatControlEscape(state) ||
    this.regexp_eatCControlLetter(state) ||
    this.regexp_eatZero(state) ||
    this.regexp_eatHexEscapeSequence(state) ||
    this.regexp_eatRegExpUnicodeEscapeSequence(state, false) ||
    (!state.switchU && this.regexp_eatLegacyOctalEscapeSequence(state)) ||
    this.regexp_eatIdentityEscape(state)
  )
};
pp$8.regexp_eatCControlLetter = function(state) {
  var start = state.pos;
  if (state.eat(0x63 /* c */)) {
    if (this.regexp_eatControlLetter(state)) {
      return true
    }
    state.pos = start;
  }
  return false
};
pp$8.regexp_eatZero = function(state) {
  if (state.current() === 0x30 /* 0 */ && !isDecimalDigit(state.lookahead())) {
    state.lastIntValue = 0;
    state.advance();
    return true
  }
  return false
};

// https://www.ecma-international.org/ecma-262/8.0/#prod-ControlEscape
pp$8.regexp_eatControlEscape = function(state) {
  var ch = state.current();
  if (ch === 0x74 /* t */) {
    state.lastIntValue = 0x09; /* \t */
    state.advance();
    return true
  }
  if (ch === 0x6E /* n */) {
    state.lastIntValue = 0x0A; /* \n */
    state.advance();
    return true
  }
  if (ch === 0x76 /* v */) {
    state.lastIntValue = 0x0B; /* \v */
    state.advance();
    return true
  }
  if (ch === 0x66 /* f */) {
    state.lastIntValue = 0x0C; /* \f */
    state.advance();
    return true
  }
  if (ch === 0x72 /* r */) {
    state.lastIntValue = 0x0D; /* \r */
    state.advance();
    return true
  }
  return false
};

// https://www.ecma-international.org/ecma-262/8.0/#prod-ControlLetter
pp$8.regexp_eatControlLetter = function(state) {
  var ch = state.current();
  if (isControlLetter(ch)) {
    state.lastIntValue = ch % 0x20;
    state.advance();
    return true
  }
  return false
};
function isControlLetter(ch) {
  return (
    (ch >= 0x41 /* A */ && ch <= 0x5A /* Z */) ||
    (ch >= 0x61 /* a */ && ch <= 0x7A /* z */)
  )
}

// https://www.ecma-international.org/ecma-262/8.0/#prod-RegExpUnicodeEscapeSequence
pp$8.regexp_eatRegExpUnicodeEscapeSequence = function(state, forceU) {
  if ( forceU === void 0 ) forceU = false;

  var start = state.pos;
  var switchU = forceU || state.switchU;

  if (state.eat(0x75 /* u */)) {
    if (this.regexp_eatFixedHexDigits(state, 4)) {
      var lead = state.lastIntValue;
      if (switchU && lead >= 0xD800 && lead <= 0xDBFF) {
        var leadSurrogateEnd = state.pos;
        if (state.eat(0x5C /* \ */) && state.eat(0x75 /* u */) && this.regexp_eatFixedHexDigits(state, 4)) {
          var trail = state.lastIntValue;
          if (trail >= 0xDC00 && trail <= 0xDFFF) {
            state.lastIntValue = (lead - 0xD800) * 0x400 + (trail - 0xDC00) + 0x10000;
            return true
          }
        }
        state.pos = leadSurrogateEnd;
        state.lastIntValue = lead;
      }
      return true
    }
    if (
      switchU &&
      state.eat(0x7B /* { */) &&
      this.regexp_eatHexDigits(state) &&
      state.eat(0x7D /* } */) &&
      isValidUnicode(state.lastIntValue)
    ) {
      return true
    }
    if (switchU) {
      state.raise("Invalid unicode escape");
    }
    state.pos = start;
  }

  return false
};
function isValidUnicode(ch) {
  return ch >= 0 && ch <= 0x10FFFF
}

// https://www.ecma-international.org/ecma-262/8.0/#prod-annexB-IdentityEscape
pp$8.regexp_eatIdentityEscape = function(state) {
  if (state.switchU) {
    if (this.regexp_eatSyntaxCharacter(state)) {
      return true
    }
    if (state.eat(0x2F /* / */)) {
      state.lastIntValue = 0x2F; /* / */
      return true
    }
    return false
  }

  var ch = state.current();
  if (ch !== 0x63 /* c */ && (!state.switchN || ch !== 0x6B /* k */)) {
    state.lastIntValue = ch;
    state.advance();
    return true
  }

  return false
};

// https://www.ecma-international.org/ecma-262/8.0/#prod-DecimalEscape
pp$8.regexp_eatDecimalEscape = function(state) {
  state.lastIntValue = 0;
  var ch = state.current();
  if (ch >= 0x31 /* 1 */ && ch <= 0x39 /* 9 */) {
    do {
      state.lastIntValue = 10 * state.lastIntValue + (ch - 0x30 /* 0 */);
      state.advance();
    } while ((ch = state.current()) >= 0x30 /* 0 */ && ch <= 0x39 /* 9 */)
    return true
  }
  return false
};

// https://www.ecma-international.org/ecma-262/8.0/#prod-CharacterClassEscape
pp$8.regexp_eatCharacterClassEscape = function(state) {
  var ch = state.current();

  if (isCharacterClassEscape(ch)) {
    state.lastIntValue = -1;
    state.advance();
    return true
  }

  if (
    state.switchU &&
    this.options.ecmaVersion >= 9 &&
    (ch === 0x50 /* P */ || ch === 0x70 /* p */)
  ) {
    state.lastIntValue = -1;
    state.advance();
    if (
      state.eat(0x7B /* { */) &&
      this.regexp_eatUnicodePropertyValueExpression(state) &&
      state.eat(0x7D /* } */)
    ) {
      return true
    }
    state.raise("Invalid property name");
  }

  return false
};
function isCharacterClassEscape(ch) {
  return (
    ch === 0x64 /* d */ ||
    ch === 0x44 /* D */ ||
    ch === 0x73 /* s */ ||
    ch === 0x53 /* S */ ||
    ch === 0x77 /* w */ ||
    ch === 0x57 /* W */
  )
}

// UnicodePropertyValueExpression ::
//   UnicodePropertyName `=` UnicodePropertyValue
//   LoneUnicodePropertyNameOrValue
pp$8.regexp_eatUnicodePropertyValueExpression = function(state) {
  var start = state.pos;

  // UnicodePropertyName `=` UnicodePropertyValue
  if (this.regexp_eatUnicodePropertyName(state) && state.eat(0x3D /* = */)) {
    var name = state.lastStringValue;
    if (this.regexp_eatUnicodePropertyValue(state)) {
      var value = state.lastStringValue;
      this.regexp_validateUnicodePropertyNameAndValue(state, name, value);
      return true
    }
  }
  state.pos = start;

  // LoneUnicodePropertyNameOrValue
  if (this.regexp_eatLoneUnicodePropertyNameOrValue(state)) {
    var nameOrValue = state.lastStringValue;
    this.regexp_validateUnicodePropertyNameOrValue(state, nameOrValue);
    return true
  }
  return false
};
pp$8.regexp_validateUnicodePropertyNameAndValue = function(state, name, value) {
  if (!has(state.unicodeProperties.nonBinary, name))
    { state.raise("Invalid property name"); }
  if (!state.unicodeProperties.nonBinary[name].test(value))
    { state.raise("Invalid property value"); }
};
pp$8.regexp_validateUnicodePropertyNameOrValue = function(state, nameOrValue) {
  if (!state.unicodeProperties.binary.test(nameOrValue))
    { state.raise("Invalid property name"); }
};

// UnicodePropertyName ::
//   UnicodePropertyNameCharacters
pp$8.regexp_eatUnicodePropertyName = function(state) {
  var ch = 0;
  state.lastStringValue = "";
  while (isUnicodePropertyNameCharacter(ch = state.current())) {
    state.lastStringValue += codePointToString(ch);
    state.advance();
  }
  return state.lastStringValue !== ""
};
function isUnicodePropertyNameCharacter(ch) {
  return isControlLetter(ch) || ch === 0x5F /* _ */
}

// UnicodePropertyValue ::
//   UnicodePropertyValueCharacters
pp$8.regexp_eatUnicodePropertyValue = function(state) {
  var ch = 0;
  state.lastStringValue = "";
  while (isUnicodePropertyValueCharacter(ch = state.current())) {
    state.lastStringValue += codePointToString(ch);
    state.advance();
  }
  return state.lastStringValue !== ""
};
function isUnicodePropertyValueCharacter(ch) {
  return isUnicodePropertyNameCharacter(ch) || isDecimalDigit(ch)
}

// LoneUnicodePropertyNameOrValue ::
//   UnicodePropertyValueCharacters
pp$8.regexp_eatLoneUnicodePropertyNameOrValue = function(state) {
  return this.regexp_eatUnicodePropertyValue(state)
};

// https://www.ecma-international.org/ecma-262/8.0/#prod-CharacterClass
pp$8.regexp_eatCharacterClass = function(state) {
  if (state.eat(0x5B /* [ */)) {
    state.eat(0x5E /* ^ */);
    this.regexp_classRanges(state);
    if (state.eat(0x5D /* ] */)) {
      return true
    }
    // Unreachable since it threw "unterminated regular expression" error before.
    state.raise("Unterminated character class");
  }
  return false
};

// https://www.ecma-international.org/ecma-262/8.0/#prod-ClassRanges
// https://www.ecma-international.org/ecma-262/8.0/#prod-NonemptyClassRanges
// https://www.ecma-international.org/ecma-262/8.0/#prod-NonemptyClassRangesNoDash
pp$8.regexp_classRanges = function(state) {
  while (this.regexp_eatClassAtom(state)) {
    var left = state.lastIntValue;
    if (state.eat(0x2D /* - */) && this.regexp_eatClassAtom(state)) {
      var right = state.lastIntValue;
      if (state.switchU && (left === -1 || right === -1)) {
        state.raise("Invalid character class");
      }
      if (left !== -1 && right !== -1 && left > right) {
        state.raise("Range out of order in character class");
      }
    }
  }
};

// https://www.ecma-international.org/ecma-262/8.0/#prod-ClassAtom
// https://www.ecma-international.org/ecma-262/8.0/#prod-ClassAtomNoDash
pp$8.regexp_eatClassAtom = function(state) {
  var start = state.pos;

  if (state.eat(0x5C /* \ */)) {
    if (this.regexp_eatClassEscape(state)) {
      return true
    }
    if (state.switchU) {
      // Make the same message as V8.
      var ch$1 = state.current();
      if (ch$1 === 0x63 /* c */ || isOctalDigit(ch$1)) {
        state.raise("Invalid class escape");
      }
      state.raise("Invalid escape");
    }
    state.pos = start;
  }

  var ch = state.current();
  if (ch !== 0x5D /* ] */) {
    state.lastIntValue = ch;
    state.advance();
    return true
  }

  return false
};

// https://www.ecma-international.org/ecma-262/8.0/#prod-annexB-ClassEscape
pp$8.regexp_eatClassEscape = function(state) {
  var start = state.pos;

  if (state.eat(0x62 /* b */)) {
    state.lastIntValue = 0x08; /* <BS> */
    return true
  }

  if (state.switchU && state.eat(0x2D /* - */)) {
    state.lastIntValue = 0x2D; /* - */
    return true
  }

  if (!state.switchU && state.eat(0x63 /* c */)) {
    if (this.regexp_eatClassControlLetter(state)) {
      return true
    }
    state.pos = start;
  }

  return (
    this.regexp_eatCharacterClassEscape(state) ||
    this.regexp_eatCharacterEscape(state)
  )
};

// https://www.ecma-international.org/ecma-262/8.0/#prod-annexB-ClassControlLetter
pp$8.regexp_eatClassControlLetter = function(state) {
  var ch = state.current();
  if (isDecimalDigit(ch) || ch === 0x5F /* _ */) {
    state.lastIntValue = ch % 0x20;
    state.advance();
    return true
  }
  return false
};

// https://www.ecma-international.org/ecma-262/8.0/#prod-HexEscapeSequence
pp$8.regexp_eatHexEscapeSequence = function(state) {
  var start = state.pos;
  if (state.eat(0x78 /* x */)) {
    if (this.regexp_eatFixedHexDigits(state, 2)) {
      return true
    }
    if (state.switchU) {
      state.raise("Invalid escape");
    }
    state.pos = start;
  }
  return false
};

// https://www.ecma-international.org/ecma-262/8.0/#prod-DecimalDigits
pp$8.regexp_eatDecimalDigits = function(state) {
  var start = state.pos;
  var ch = 0;
  state.lastIntValue = 0;
  while (isDecimalDigit(ch = state.current())) {
    state.lastIntValue = 10 * state.lastIntValue + (ch - 0x30 /* 0 */);
    state.advance();
  }
  return state.pos !== start
};
function isDecimalDigit(ch) {
  return ch >= 0x30 /* 0 */ && ch <= 0x39 /* 9 */
}

// https://www.ecma-international.org/ecma-262/8.0/#prod-HexDigits
pp$8.regexp_eatHexDigits = function(state) {
  var start = state.pos;
  var ch = 0;
  state.lastIntValue = 0;
  while (isHexDigit(ch = state.current())) {
    state.lastIntValue = 16 * state.lastIntValue + hexToInt(ch);
    state.advance();
  }
  return state.pos !== start
};
function isHexDigit(ch) {
  return (
    (ch >= 0x30 /* 0 */ && ch <= 0x39 /* 9 */) ||
    (ch >= 0x41 /* A */ && ch <= 0x46 /* F */) ||
    (ch >= 0x61 /* a */ && ch <= 0x66 /* f */)
  )
}
function hexToInt(ch) {
  if (ch >= 0x41 /* A */ && ch <= 0x46 /* F */) {
    return 10 + (ch - 0x41 /* A */)
  }
  if (ch >= 0x61 /* a */ && ch <= 0x66 /* f */) {
    return 10 + (ch - 0x61 /* a */)
  }
  return ch - 0x30 /* 0 */
}

// https://www.ecma-international.org/ecma-262/8.0/#prod-annexB-LegacyOctalEscapeSequence
// Allows only 0-377(octal) i.e. 0-255(decimal).
pp$8.regexp_eatLegacyOctalEscapeSequence = function(state) {
  if (this.regexp_eatOctalDigit(state)) {
    var n1 = state.lastIntValue;
    if (this.regexp_eatOctalDigit(state)) {
      var n2 = state.lastIntValue;
      if (n1 <= 3 && this.regexp_eatOctalDigit(state)) {
        state.lastIntValue = n1 * 64 + n2 * 8 + state.lastIntValue;
      } else {
        state.lastIntValue = n1 * 8 + n2;
      }
    } else {
      state.lastIntValue = n1;
    }
    return true
  }
  return false
};

// https://www.ecma-international.org/ecma-262/8.0/#prod-OctalDigit
pp$8.regexp_eatOctalDigit = function(state) {
  var ch = state.current();
  if (isOctalDigit(ch)) {
    state.lastIntValue = ch - 0x30; /* 0 */
    state.advance();
    return true
  }
  state.lastIntValue = 0;
  return false
};
function isOctalDigit(ch) {
  return ch >= 0x30 /* 0 */ && ch <= 0x37 /* 7 */
}

// https://www.ecma-international.org/ecma-262/8.0/#prod-Hex4Digits
// https://www.ecma-international.org/ecma-262/8.0/#prod-HexDigit
// And HexDigit HexDigit in https://www.ecma-international.org/ecma-262/8.0/#prod-HexEscapeSequence
pp$8.regexp_eatFixedHexDigits = function(state, length) {
  var start = state.pos;
  state.lastIntValue = 0;
  for (var i = 0; i < length; ++i) {
    var ch = state.current();
    if (!isHexDigit(ch)) {
      state.pos = start;
      return false
    }
    state.lastIntValue = 16 * state.lastIntValue + hexToInt(ch);
    state.advance();
  }
  return true
};

// Object type used to represent tokens. Note that normally, tokens
// simply exist as properties on the parser object. This is only
// used for the onToken callback and the external tokenizer.

var Token = function Token(p) {
  this.type = p.type;
  this.value = p.value;
  this.start = p.start;
  this.end = p.end;
  if (p.options.locations)
    { this.loc = new SourceLocation(p, p.startLoc, p.endLoc); }
  if (p.options.ranges)
    { this.range = [p.start, p.end]; }
};

// ## Tokenizer

var pp$9 = Parser.prototype;

// Move to the next token

pp$9.next = function(ignoreEscapeSequenceInKeyword) {
  if (!ignoreEscapeSequenceInKeyword && this.type.keyword && this.containsEsc)
    { this.raiseRecoverable(this.start, "Escape sequence in keyword " + this.type.keyword); }
  if (this.options.onToken)
    { this.options.onToken(new Token(this)); }

  this.lastTokEnd = this.end;
  this.lastTokStart = this.start;
  this.lastTokEndLoc = this.endLoc;
  this.lastTokStartLoc = this.startLoc;
  this.nextToken();
};

pp$9.getToken = function() {
  this.next();
  return new Token(this)
};

// If we're in an ES6 environment, make parsers iterable
if (typeof Symbol !== "undefined")
  { pp$9[Symbol.iterator] = function() {
    var this$1 = this;

    return {
      next: function () {
        var token = this$1.getToken();
        return {
          done: token.type === types.eof,
          value: token
        }
      }
    }
  }; }

// Toggle strict mode. Re-reads the next number or string to please
// pedantic tests (`"use strict"; 010;` should fail).

pp$9.curContext = function() {
  return this.context[this.context.length - 1]
};

// Read a single token, updating the parser object's token-related
// properties.

pp$9.nextToken = function() {
  var curContext = this.curContext();
  if (!curContext || !curContext.preserveSpace) { this.skipSpace(); }

  this.start = this.pos;
  if (this.options.locations) { this.startLoc = this.curPosition(); }
  if (this.pos >= this.input.length) { return this.finishToken(types.eof) }

  if (curContext.override) { return curContext.override(this) }
  else { this.readToken(this.fullCharCodeAtPos()); }
};

pp$9.readToken = function(code) {
  // Identifier or keyword. '\uXXXX' sequences are allowed in
  // identifiers, so '\' also dispatches to that.
  if (isIdentifierStart(code, this.options.ecmaVersion >= 6) || code === 92 /* '\' */)
    { return this.readWord() }

  return this.getTokenFromCode(code)
};

pp$9.fullCharCodeAtPos = function() {
  var code = this.input.charCodeAt(this.pos);
  if (code <= 0xd7ff || code >= 0xe000) { return code }
  var next = this.input.charCodeAt(this.pos + 1);
  return (code << 10) + next - 0x35fdc00
};

pp$9.skipBlockComment = function() {
  var startLoc = this.options.onComment && this.curPosition();
  var start = this.pos, end = this.input.indexOf("*/", this.pos += 2);
  if (end === -1) { this.raise(this.pos - 2, "Unterminated comment"); }
  this.pos = end + 2;
  if (this.options.locations) {
    lineBreakG.lastIndex = start;
    var match;
    while ((match = lineBreakG.exec(this.input)) && match.index < this.pos) {
      ++this.curLine;
      this.lineStart = match.index + match[0].length;
    }
  }
  if (this.options.onComment)
    { this.options.onComment(true, this.input.slice(start + 2, end), start, this.pos,
                           startLoc, this.curPosition()); }
};

pp$9.skipLineComment = function(startSkip) {
  var start = this.pos;
  var startLoc = this.options.onComment && this.curPosition();
  var ch = this.input.charCodeAt(this.pos += startSkip);
  while (this.pos < this.input.length && !isNewLine(ch)) {
    ch = this.input.charCodeAt(++this.pos);
  }
  if (this.options.onComment)
    { this.options.onComment(false, this.input.slice(start + startSkip, this.pos), start, this.pos,
                           startLoc, this.curPosition()); }
};

// Called at the start of the parse and after every token. Skips
// whitespace and comments, and.

pp$9.skipSpace = function() {
  loop: while (this.pos < this.input.length) {
    var ch = this.input.charCodeAt(this.pos);
    switch (ch) {
    case 32: case 160: // ' '
      ++this.pos;
      break
    case 13:
      if (this.input.charCodeAt(this.pos + 1) === 10) {
        ++this.pos;
      }
    case 10: case 8232: case 8233:
      ++this.pos;
      if (this.options.locations) {
        ++this.curLine;
        this.lineStart = this.pos;
      }
      break
    case 47: // '/'
      switch (this.input.charCodeAt(this.pos + 1)) {
      case 42: // '*'
        this.skipBlockComment();
        break
      case 47:
        this.skipLineComment(2);
        break
      default:
        break loop
      }
      break
    default:
      if (ch > 8 && ch < 14 || ch >= 5760 && nonASCIIwhitespace.test(String.fromCharCode(ch))) {
        ++this.pos;
      } else {
        break loop
      }
    }
  }
};

// Called at the end of every token. Sets `end`, `val`, and
// maintains `context` and `exprAllowed`, and skips the space after
// the token, so that the next one's `start` will point at the
// right position.

pp$9.finishToken = function(type, val) {
  this.end = this.pos;
  if (this.options.locations) { this.endLoc = this.curPosition(); }
  var prevType = this.type;
  this.type = type;
  this.value = val;

  this.updateContext(prevType);
};

// ### Token reading

// This is the function that is called to fetch the next token. It
// is somewhat obscure, because it works in character codes rather
// than characters, and because operator parsing has been inlined
// into it.
//
// All in the name of speed.
//
pp$9.readToken_dot = function() {
  var next = this.input.charCodeAt(this.pos + 1);
  if (next >= 48 && next <= 57) { return this.readNumber(true) }
  var next2 = this.input.charCodeAt(this.pos + 2);
  if (this.options.ecmaVersion >= 6 && next === 46 && next2 === 46) { // 46 = dot '.'
    this.pos += 3;
    return this.finishToken(types.ellipsis)
  } else {
    ++this.pos;
    return this.finishToken(types.dot)
  }
};

pp$9.readToken_slash = function() { // '/'
  var next = this.input.charCodeAt(this.pos + 1);
  if (this.exprAllowed) { ++this.pos; return this.readRegexp() }
  if (next === 61) { return this.finishOp(types.assign, 2) }
  return this.finishOp(types.slash, 1)
};

pp$9.readToken_mult_modulo_exp = function(code) { // '%*'
  var next = this.input.charCodeAt(this.pos + 1);
  var size = 1;
  var tokentype = code === 42 ? types.star : types.modulo;

  // exponentiation operator ** and **=
  if (this.options.ecmaVersion >= 7 && code === 42 && next === 42) {
    ++size;
    tokentype = types.starstar;
    next = this.input.charCodeAt(this.pos + 2);
  }

  if (next === 61) { return this.finishOp(types.assign, size + 1) }
  return this.finishOp(tokentype, size)
};

pp$9.readToken_pipe_amp = function(code) { // '|&'
  var next = this.input.charCodeAt(this.pos + 1);
  if (next === code) {
    if (this.options.ecmaVersion >= 12) {
      var next2 = this.input.charCodeAt(this.pos + 2);
      if (next2 === 61) { return this.finishOp(types.assign, 3) }
    }
    return this.finishOp(code === 124 ? types.logicalOR : types.logicalAND, 2)
  }
  if (next === 61) { return this.finishOp(types.assign, 2) }
  return this.finishOp(code === 124 ? types.bitwiseOR : types.bitwiseAND, 1)
};

pp$9.readToken_caret = function() { // '^'
  var next = this.input.charCodeAt(this.pos + 1);
  if (next === 61) { return this.finishOp(types.assign, 2) }
  return this.finishOp(types.bitwiseXOR, 1)
};

pp$9.readToken_plus_min = function(code) { // '+-'
  var next = this.input.charCodeAt(this.pos + 1);
  if (next === code) {
    if (next === 45 && !this.inModule && this.input.charCodeAt(this.pos + 2) === 62 &&
        (this.lastTokEnd === 0 || lineBreak.test(this.input.slice(this.lastTokEnd, this.pos)))) {
      // A `-->` line comment
      this.skipLineComment(3);
      this.skipSpace();
      return this.nextToken()
    }
    return this.finishOp(types.incDec, 2)
  }
  if (next === 61) { return this.finishOp(types.assign, 2) }
  return this.finishOp(types.plusMin, 1)
};

pp$9.readToken_lt_gt = function(code) { // '<>'
  var next = this.input.charCodeAt(this.pos + 1);
  var size = 1;
  if (next === code) {
    size = code === 62 && this.input.charCodeAt(this.pos + 2) === 62 ? 3 : 2;
    if (this.input.charCodeAt(this.pos + size) === 61) { return this.finishOp(types.assign, size + 1) }
    return this.finishOp(types.bitShift, size)
  }
  if (next === 33 && code === 60 && !this.inModule && this.input.charCodeAt(this.pos + 2) === 45 &&
      this.input.charCodeAt(this.pos + 3) === 45) {
    // `<!--`, an XML-style comment that should be interpreted as a line comment
    this.skipLineComment(4);
    this.skipSpace();
    return this.nextToken()
  }
  if (next === 61) { size = 2; }
  return this.finishOp(types.relational, size)
};

pp$9.readToken_eq_excl = function(code) { // '=!'
  var next = this.input.charCodeAt(this.pos + 1);
  if (next === 61) { return this.finishOp(types.equality, this.input.charCodeAt(this.pos + 2) === 61 ? 3 : 2) }
  if (code === 61 && next === 62 && this.options.ecmaVersion >= 6) { // '=>'
    this.pos += 2;
    return this.finishToken(types.arrow)
  }
  return this.finishOp(code === 61 ? types.eq : types.prefix, 1)
};

pp$9.readToken_question = function() { // '?'
  var ecmaVersion = this.options.ecmaVersion;
  if (ecmaVersion >= 11) {
    var next = this.input.charCodeAt(this.pos + 1);
    if (next === 46) {
      var next2 = this.input.charCodeAt(this.pos + 2);
      if (next2 < 48 || next2 > 57) { return this.finishOp(types.questionDot, 2) }
    }
    if (next === 63) {
      if (ecmaVersion >= 12) {
        var next2$1 = this.input.charCodeAt(this.pos + 2);
        if (next2$1 === 61) { return this.finishOp(types.assign, 3) }
      }
      return this.finishOp(types.coalesce, 2)
    }
  }
  return this.finishOp(types.question, 1)
};

pp$9.getTokenFromCode = function(code) {
  switch (code) {
  // The interpretation of a dot depends on whether it is followed
  // by a digit or another two dots.
  case 46: // '.'
    return this.readToken_dot()

  // Punctuation tokens.
  case 40: ++this.pos; return this.finishToken(types.parenL)
  case 41: ++this.pos; return this.finishToken(types.parenR)
  case 59: ++this.pos; return this.finishToken(types.semi)
  case 44: ++this.pos; return this.finishToken(types.comma)
  case 91: ++this.pos; return this.finishToken(types.bracketL)
  case 93: ++this.pos; return this.finishToken(types.bracketR)
  case 123: ++this.pos; return this.finishToken(types.braceL)
  case 125: ++this.pos; return this.finishToken(types.braceR)
  case 58: ++this.pos; return this.finishToken(types.colon)

  case 96: // '`'
    if (this.options.ecmaVersion < 6) { break }
    ++this.pos;
    return this.finishToken(types.backQuote)

  case 48: // '0'
    var next = this.input.charCodeAt(this.pos + 1);
    if (next === 120 || next === 88) { return this.readRadixNumber(16) } // '0x', '0X' - hex number
    if (this.options.ecmaVersion >= 6) {
      if (next === 111 || next === 79) { return this.readRadixNumber(8) } // '0o', '0O' - octal number
      if (next === 98 || next === 66) { return this.readRadixNumber(2) } // '0b', '0B' - binary number
    }

  // Anything else beginning with a digit is an integer, octal
  // number, or float.
  case 49: case 50: case 51: case 52: case 53: case 54: case 55: case 56: case 57: // 1-9
    return this.readNumber(false)

  // Quotes produce strings.
  case 34: case 39: // '"', "'"
    return this.readString(code)

  // Operators are parsed inline in tiny state machines. '=' (61) is
  // often referred to. `finishOp` simply skips the amount of
  // characters it is given as second argument, and returns a token
  // of the type given by its first argument.

  case 47: // '/'
    return this.readToken_slash()

  case 37: case 42: // '%*'
    return this.readToken_mult_modulo_exp(code)

  case 124: case 38: // '|&'
    return this.readToken_pipe_amp(code)

  case 94: // '^'
    return this.readToken_caret()

  case 43: case 45: // '+-'
    return this.readToken_plus_min(code)

  case 60: case 62: // '<>'
    return this.readToken_lt_gt(code)

  case 61: case 33: // '=!'
    return this.readToken_eq_excl(code)

  case 63: // '?'
    return this.readToken_question()

  case 126: // '~'
    return this.finishOp(types.prefix, 1)
  }

  this.raise(this.pos, "Unexpected character '" + codePointToString$1(code) + "'");
};

pp$9.finishOp = function(type, size) {
  var str = this.input.slice(this.pos, this.pos + size);
  this.pos += size;
  return this.finishToken(type, str)
};

pp$9.readRegexp = function() {
  var escaped, inClass, start = this.pos;
  for (;;) {
    if (this.pos >= this.input.length) { this.raise(start, "Unterminated regular expression"); }
    var ch = this.input.charAt(this.pos);
    if (lineBreak.test(ch)) { this.raise(start, "Unterminated regular expression"); }
    if (!escaped) {
      if (ch === "[") { inClass = true; }
      else if (ch === "]" && inClass) { inClass = false; }
      else if (ch === "/" && !inClass) { break }
      escaped = ch === "\\";
    } else { escaped = false; }
    ++this.pos;
  }
  var pattern = this.input.slice(start, this.pos);
  ++this.pos;
  var flagsStart = this.pos;
  var flags = this.readWord1();
  if (this.containsEsc) { this.unexpected(flagsStart); }

  // Validate pattern
  var state = this.regexpState || (this.regexpState = new RegExpValidationState(this));
  state.reset(start, pattern, flags);
  this.validateRegExpFlags(state);
  this.validateRegExpPattern(state);

  // Create Literal#value property value.
  var value = null;
  try {
    value = new RegExp(pattern, flags);
  } catch (e) {
    // ESTree requires null if it failed to instantiate RegExp object.
    // https://github.com/estree/estree/blob/a27003adf4fd7bfad44de9cef372a2eacd527b1c/es5.md#regexpliteral
  }

  return this.finishToken(types.regexp, {pattern: pattern, flags: flags, value: value})
};

// Read an integer in the given radix. Return null if zero digits
// were read, the integer value otherwise. When `len` is given, this
// will return `null` unless the integer has exactly `len` digits.

pp$9.readInt = function(radix, len, maybeLegacyOctalNumericLiteral) {
  // `len` is used for character escape sequences. In that case, disallow separators.
  var allowSeparators = this.options.ecmaVersion >= 12 && len === undefined;

  // `maybeLegacyOctalNumericLiteral` is true if it doesn't have prefix (0x,0o,0b)
  // and isn't fraction part nor exponent part. In that case, if the first digit
  // is zero then disallow separators.
  var isLegacyOctalNumericLiteral = maybeLegacyOctalNumericLiteral && this.input.charCodeAt(this.pos) === 48;

  var start = this.pos, total = 0, lastCode = 0;
  for (var i = 0, e = len == null ? Infinity : len; i < e; ++i, ++this.pos) {
    var code = this.input.charCodeAt(this.pos), val = (void 0);

    if (allowSeparators && code === 95) {
      if (isLegacyOctalNumericLiteral) { this.raiseRecoverable(this.pos, "Numeric separator is not allowed in legacy octal numeric literals"); }
      if (lastCode === 95) { this.raiseRecoverable(this.pos, "Numeric separator must be exactly one underscore"); }
      if (i === 0) { this.raiseRecoverable(this.pos, "Numeric separator is not allowed at the first of digits"); }
      lastCode = code;
      continue
    }

    if (code >= 97) { val = code - 97 + 10; } // a
    else if (code >= 65) { val = code - 65 + 10; } // A
    else if (code >= 48 && code <= 57) { val = code - 48; } // 0-9
    else { val = Infinity; }
    if (val >= radix) { break }
    lastCode = code;
    total = total * radix + val;
  }

  if (allowSeparators && lastCode === 95) { this.raiseRecoverable(this.pos - 1, "Numeric separator is not allowed at the last of digits"); }
  if (this.pos === start || len != null && this.pos - start !== len) { return null }

  return total
};

function stringToNumber(str, isLegacyOctalNumericLiteral) {
  if (isLegacyOctalNumericLiteral) {
    return parseInt(str, 8)
  }

  // `parseFloat(value)` stops parsing at the first numeric separator then returns a wrong value.
  return parseFloat(str.replace(/_/g, ""))
}

function stringToBigInt(str) {
  if (typeof BigInt !== "function") {
    return null
  }

  // `BigInt(value)` throws syntax error if the string contains numeric separators.
  return BigInt(str.replace(/_/g, ""))
}

pp$9.readRadixNumber = function(radix) {
  var start = this.pos;
  this.pos += 2; // 0x
  var val = this.readInt(radix);
  if (val == null) { this.raise(this.start + 2, "Expected number in radix " + radix); }
  if (this.options.ecmaVersion >= 11 && this.input.charCodeAt(this.pos) === 110) {
    val = stringToBigInt(this.input.slice(start, this.pos));
    ++this.pos;
  } else if (isIdentifierStart(this.fullCharCodeAtPos())) { this.raise(this.pos, "Identifier directly after number"); }
  return this.finishToken(types.num, val)
};

// Read an integer, octal integer, or floating-point number.

pp$9.readNumber = function(startsWithDot) {
  var start = this.pos;
  if (!startsWithDot && this.readInt(10, undefined, true) === null) { this.raise(start, "Invalid number"); }
  var octal = this.pos - start >= 2 && this.input.charCodeAt(start) === 48;
  if (octal && this.strict) { this.raise(start, "Invalid number"); }
  var next = this.input.charCodeAt(this.pos);
  if (!octal && !startsWithDot && this.options.ecmaVersion >= 11 && next === 110) {
    var val$1 = stringToBigInt(this.input.slice(start, this.pos));
    ++this.pos;
    if (isIdentifierStart(this.fullCharCodeAtPos())) { this.raise(this.pos, "Identifier directly after number"); }
    return this.finishToken(types.num, val$1)
  }
  if (octal && /[89]/.test(this.input.slice(start, this.pos))) { octal = false; }
  if (next === 46 && !octal) { // '.'
    ++this.pos;
    this.readInt(10);
    next = this.input.charCodeAt(this.pos);
  }
  if ((next === 69 || next === 101) && !octal) { // 'eE'
    next = this.input.charCodeAt(++this.pos);
    if (next === 43 || next === 45) { ++this.pos; } // '+-'
    if (this.readInt(10) === null) { this.raise(start, "Invalid number"); }
  }
  if (isIdentifierStart(this.fullCharCodeAtPos())) { this.raise(this.pos, "Identifier directly after number"); }

  var val = stringToNumber(this.input.slice(start, this.pos), octal);
  return this.finishToken(types.num, val)
};

// Read a string value, interpreting backslash-escapes.

pp$9.readCodePoint = function() {
  var ch = this.input.charCodeAt(this.pos), code;

  if (ch === 123) { // '{'
    if (this.options.ecmaVersion < 6) { this.unexpected(); }
    var codePos = ++this.pos;
    code = this.readHexChar(this.input.indexOf("}", this.pos) - this.pos);
    ++this.pos;
    if (code > 0x10FFFF) { this.invalidStringToken(codePos, "Code point out of bounds"); }
  } else {
    code = this.readHexChar(4);
  }
  return code
};

function codePointToString$1(code) {
  // UTF-16 Decoding
  if (code <= 0xFFFF) { return String.fromCharCode(code) }
  code -= 0x10000;
  return String.fromCharCode((code >> 10) + 0xD800, (code & 1023) + 0xDC00)
}

pp$9.readString = function(quote) {
  var out = "", chunkStart = ++this.pos;
  for (;;) {
    if (this.pos >= this.input.length) { this.raise(this.start, "Unterminated string constant"); }
    var ch = this.input.charCodeAt(this.pos);
    if (ch === quote) { break }
    if (ch === 92) { // '\'
      out += this.input.slice(chunkStart, this.pos);
      out += this.readEscapedChar(false);
      chunkStart = this.pos;
    } else {
      if (isNewLine(ch, this.options.ecmaVersion >= 10)) { this.raise(this.start, "Unterminated string constant"); }
      ++this.pos;
    }
  }
  out += this.input.slice(chunkStart, this.pos++);
  return this.finishToken(types.string, out)
};

// Reads template string tokens.

var INVALID_TEMPLATE_ESCAPE_ERROR = {};

pp$9.tryReadTemplateToken = function() {
  this.inTemplateElement = true;
  try {
    this.readTmplToken();
  } catch (err) {
    if (err === INVALID_TEMPLATE_ESCAPE_ERROR) {
      this.readInvalidTemplateToken();
    } else {
      throw err
    }
  }

  this.inTemplateElement = false;
};

pp$9.invalidStringToken = function(position, message) {
  if (this.inTemplateElement && this.options.ecmaVersion >= 9) {
    throw INVALID_TEMPLATE_ESCAPE_ERROR
  } else {
    this.raise(position, message);
  }
};

pp$9.readTmplToken = function() {
  var out = "", chunkStart = this.pos;
  for (;;) {
    if (this.pos >= this.input.length) { this.raise(this.start, "Unterminated template"); }
    var ch = this.input.charCodeAt(this.pos);
    if (ch === 96 || ch === 36 && this.input.charCodeAt(this.pos + 1) === 123) { // '`', '${'
      if (this.pos === this.start && (this.type === types.template || this.type === types.invalidTemplate)) {
        if (ch === 36) {
          this.pos += 2;
          return this.finishToken(types.dollarBraceL)
        } else {
          ++this.pos;
          return this.finishToken(types.backQuote)
        }
      }
      out += this.input.slice(chunkStart, this.pos);
      return this.finishToken(types.template, out)
    }
    if (ch === 92) { // '\'
      out += this.input.slice(chunkStart, this.pos);
      out += this.readEscapedChar(true);
      chunkStart = this.pos;
    } else if (isNewLine(ch)) {
      out += this.input.slice(chunkStart, this.pos);
      ++this.pos;
      switch (ch) {
      case 13:
        if (this.input.charCodeAt(this.pos) === 10) { ++this.pos; }
      case 10:
        out += "\n";
        break
      default:
        out += String.fromCharCode(ch);
        break
      }
      if (this.options.locations) {
        ++this.curLine;
        this.lineStart = this.pos;
      }
      chunkStart = this.pos;
    } else {
      ++this.pos;
    }
  }
};

// Reads a template token to search for the end, without validating any escape sequences
pp$9.readInvalidTemplateToken = function() {
  for (; this.pos < this.input.length; this.pos++) {
    switch (this.input[this.pos]) {
    case "\\":
      ++this.pos;
      break

    case "$":
      if (this.input[this.pos + 1] !== "{") {
        break
      }
    // falls through

    case "`":
      return this.finishToken(types.invalidTemplate, this.input.slice(this.start, this.pos))

    // no default
    }
  }
  this.raise(this.start, "Unterminated template");
};

// Used to read escaped characters

pp$9.readEscapedChar = function(inTemplate) {
  var ch = this.input.charCodeAt(++this.pos);
  ++this.pos;
  switch (ch) {
  case 110: return "\n" // 'n' -> '\n'
  case 114: return "\r" // 'r' -> '\r'
  case 120: return String.fromCharCode(this.readHexChar(2)) // 'x'
  case 117: return codePointToString$1(this.readCodePoint()) // 'u'
  case 116: return "\t" // 't' -> '\t'
  case 98: return "\b" // 'b' -> '\b'
  case 118: return "\u000b" // 'v' -> '\u000b'
  case 102: return "\f" // 'f' -> '\f'
  case 13: if (this.input.charCodeAt(this.pos) === 10) { ++this.pos; } // '\r\n'
  case 10: // ' \n'
    if (this.options.locations) { this.lineStart = this.pos; ++this.curLine; }
    return ""
  case 56:
  case 57:
    if (inTemplate) {
      var codePos = this.pos - 1;

      this.invalidStringToken(
        codePos,
        "Invalid escape sequence in template string"
      );

      return null
    }
  default:
    if (ch >= 48 && ch <= 55) {
      var octalStr = this.input.substr(this.pos - 1, 3).match(/^[0-7]+/)[0];
      var octal = parseInt(octalStr, 8);
      if (octal > 255) {
        octalStr = octalStr.slice(0, -1);
        octal = parseInt(octalStr, 8);
      }
      this.pos += octalStr.length - 1;
      ch = this.input.charCodeAt(this.pos);
      if ((octalStr !== "0" || ch === 56 || ch === 57) && (this.strict || inTemplate)) {
        this.invalidStringToken(
          this.pos - 1 - octalStr.length,
          inTemplate
            ? "Octal literal in template string"
            : "Octal literal in strict mode"
        );
      }
      return String.fromCharCode(octal)
    }
    if (isNewLine(ch)) {
      // Unicode new line characters after \ get removed from output in both
      // template literals and strings
      return ""
    }
    return String.fromCharCode(ch)
  }
};

// Used to read character escape sequences ('\x', '\u', '\U').

pp$9.readHexChar = function(len) {
  var codePos = this.pos;
  var n = this.readInt(16, len);
  if (n === null) { this.invalidStringToken(codePos, "Bad character escape sequence"); }
  return n
};

// Read an identifier, and return it as a string. Sets `this.containsEsc`
// to whether the word contained a '\u' escape.
//
// Incrementally adds only escaped chars, adding other chunks as-is
// as a micro-optimization.

pp$9.readWord1 = function() {
  this.containsEsc = false;
  var word = "", first = true, chunkStart = this.pos;
  var astral = this.options.ecmaVersion >= 6;
  while (this.pos < this.input.length) {
    var ch = this.fullCharCodeAtPos();
    if (isIdentifierChar(ch, astral)) {
      this.pos += ch <= 0xffff ? 1 : 2;
    } else if (ch === 92) { // "\"
      this.containsEsc = true;
      word += this.input.slice(chunkStart, this.pos);
      var escStart = this.pos;
      if (this.input.charCodeAt(++this.pos) !== 117) // "u"
        { this.invalidStringToken(this.pos, "Expecting Unicode escape sequence \\uXXXX"); }
      ++this.pos;
      var esc = this.readCodePoint();
      if (!(first ? isIdentifierStart : isIdentifierChar)(esc, astral))
        { this.invalidStringToken(escStart, "Invalid Unicode escape"); }
      word += codePointToString$1(esc);
      chunkStart = this.pos;
    } else {
      break
    }
    first = false;
  }
  return word + this.input.slice(chunkStart, this.pos)
};

// Read an identifier or keyword token. Will check for reserved
// words when necessary.

pp$9.readWord = function() {
  var word = this.readWord1();
  var type = types.name;
  if (this.keywords.test(word)) {
    type = keywords$1[word];
  }
  return this.finishToken(type, word)
};

// Acorn is a tiny, fast JavaScript parser written in JavaScript.

var version = "7.4.0";

Parser.acorn = {
  Parser: Parser,
  version: version,
  defaultOptions: defaultOptions,
  Position: Position,
  SourceLocation: SourceLocation,
  getLineInfo: getLineInfo,
  Node: Node,
  TokenType: TokenType,
  tokTypes: types,
  keywordTypes: keywords$1,
  TokContext: TokContext,
  tokContexts: types$1,
  isIdentifierChar: isIdentifierChar,
  isIdentifierStart: isIdentifierStart,
  Token: Token,
  isNewLine: isNewLine,
  lineBreak: lineBreak,
  lineBreakG: lineBreakG,
  nonASCIIwhitespace: nonASCIIwhitespace
};

// The main exported interface (under `self.acorn` when in the
// browser) is a `parse` function that takes a code string and
// returns an abstract syntax tree as specified by [Mozilla parser
// API][api].
//
// [api]: https://developer.mozilla.org/en-US/docs/SpiderMonkey/Parser_API

function parse(input, options) {
  return Parser.parse(input, options)
}

// This function tries to parse a single expression at a given
// offset in a string. Useful for parsing mixed-language formats
// that embed JavaScript expressions.

function parseExpressionAt(input, pos, options) {
  return Parser.parseExpressionAt(input, pos, options)
}

function walk(ast, { enter, leave }) {
	return visit(ast, null, enter, leave);
}

let should_skip = false;
let should_remove = false;
let replacement = null;
const context = {
	skip: () => should_skip = true,
	remove: () => should_remove = true,
	replace: (node) => replacement = node
};

function replace(parent, prop, index, node) {
	if (parent) {
		if (index !== null) {
			parent[prop][index] = node;
		} else {
			parent[prop] = node;
		}
	}
}

function remove(parent, prop, index) {
	if (parent) {
		if (index !== null) {
			parent[prop].splice(index, 1);
		} else {
			delete parent[prop];
		}
	}
}

function visit(
	node,
	parent,
	enter,
	leave,
	prop,
	index
) {
	if (node) {
		if (enter) {
			const _should_skip = should_skip;
			const _should_remove = should_remove;
			const _replacement = replacement;
			should_skip = false;
			should_remove = false;
			replacement = null;

			enter.call(context, node, parent, prop, index);

			if (replacement) {
				node = replacement;
				replace(parent, prop, index, node);
			}

			if (should_remove) {
				remove(parent, prop, index);
			}

			const skipped = should_skip;
			const removed = should_remove;

			should_skip = _should_skip;
			should_remove = _should_remove;
			replacement = _replacement;

			if (skipped) return node;
			if (removed) return null;
		}

		for (const key in node) {
			const value = (node )[key];

			if (typeof value !== 'object') {
				continue;
			}

			else if (Array.isArray(value)) {
				for (let j = 0, k = 0; j < value.length; j += 1, k += 1) {
					if (value[j] !== null && typeof value[j].type === 'string') {
						if (!visit(value[j], node, enter, leave, key, k)) {
							// removed
							j--;
						}
					}
				}
			}

			else if (value !== null && typeof value.type === 'string') {
				visit(value, node, enter, leave, key, null);
			}
		}

		if (leave) {
			const _replacement = replacement;
			const _should_remove = should_remove;
			replacement = null;
			should_remove = false;

			leave.call(context, node, parent, prop, index);

			if (replacement) {
				node = replacement;
				replace(parent, prop, index, node);
			}

			if (should_remove) {
				remove(parent, prop, index);
			}

			const removed = should_remove;

			replacement = _replacement;
			should_remove = _should_remove;

			if (removed) return null;
		}
	}

	return node;
}

function isReference(node, parent) {
    if (node.type === 'MemberExpression') {
        return !node.computed && isReference(node.object, node);
    }
    if (node.type === 'Identifier') {
        if (!parent)
            return true;
        switch (parent.type) {
            // disregard `bar` in `foo.bar`
            case 'MemberExpression': return parent.computed || node === parent.object;
            // disregard the `foo` in `class {foo(){}}` but keep it in `class {[foo](){}}`
            case 'MethodDefinition': return parent.computed;
            // disregard the `foo` in `class {foo=bar}` but keep it in `class {[foo]=bar}` and `class {bar=foo}`
            case 'FieldDefinition': return parent.computed || node === parent.value;
            // disregard the `bar` in `{ bar: foo }`, but keep it in `{ [bar]: foo }`
            case 'Property': return parent.computed || node === parent.value;
            // disregard the `bar` in `export { foo as bar }` or
            // the foo in `import { foo as bar }`
            case 'ExportSpecifier':
            case 'ImportSpecifier': return node === parent.local;
            // disregard the `foo` in `foo: while (...) { ... break foo; ... continue foo;}`
            case 'LabeledStatement':
            case 'BreakStatement':
            case 'ContinueStatement': return false;
            default: return true;
        }
    }
    return false;
}

function analyze(expression) {
	const map = new WeakMap();

	let scope = new Scope$1(null, false);

	walk(expression, {
		enter(node, parent) {
			if (node.type === 'ImportDeclaration') {
				node.specifiers.forEach((specifier) => {
					scope.declarations.set(specifier.local.name, specifier);
				});
			} else if (/(Function(Declaration|Expression)|ArrowFunctionExpression)/.test(node.type)) {
				if (node.type === 'FunctionDeclaration') {
					scope.declarations.set(node.id.name, node);
					map.set(node, scope = new Scope$1(scope, false));
				} else {
					map.set(node, scope = new Scope$1(scope, false));
					if (node.type === 'FunctionExpression' && node.id) scope.declarations.set(node.id.name, node);
				}

				node.params.forEach((param) => {
					extract_names(param).forEach(name => {
						scope.declarations.set(name, node);
					});
				});
			} else if (/For(?:In|Of)?Statement/.test(node.type)) {
				map.set(node, scope = new Scope$1(scope, true));
			} else if (node.type === 'BlockStatement') {
				map.set(node, scope = new Scope$1(scope, true));
			} else if (/(Class|Variable)Declaration/.test(node.type)) {
				scope.add_declaration(node);
			} else if (node.type === 'CatchClause') {
				map.set(node, scope = new Scope$1(scope, true));

				if (node.param) {
					extract_names(node.param).forEach(name => {
						scope.declarations.set(name, node.param);
					});
				}
			}
		},

		leave(node) {
			if (map.has(node)) {
				scope = scope.parent;
			}
		}
	});

	const globals = new Map();

	walk(expression, {
		enter(node, parent) {
			if (map.has(node)) scope = map.get(node);

			if (node.type === 'Identifier' && isReference(node, parent)) {
				const owner = scope.find_owner(node.name);
				if (!owner) globals.set(node.name, node);

				add_reference(scope, node.name);
			}
		},
		leave(node) {
			if (map.has(node)) {
				scope = scope.parent;
			}
		}
	});

	return { map, scope, globals };
}

function add_reference(scope, name) {
	scope.references.add(name);
	if (scope.parent) add_reference(scope.parent, name);
}

class Scope$1 {
	
	
	__init() {this.declarations = new Map();}
	__init2() {this.initialised_declarations = new Set();}
	__init3() {this.references = new Set();}

	constructor(parent, block) {Scope$1.prototype.__init.call(this);Scope$1.prototype.__init2.call(this);Scope$1.prototype.__init3.call(this);
		this.parent = parent;
		this.block = block;
	}


	add_declaration(node) {
		if (node.type === 'VariableDeclaration') {
			if (node.kind === 'var' && this.block && this.parent) {
				this.parent.add_declaration(node);
			} else if (node.type === 'VariableDeclaration') {
				node.declarations.forEach((declarator) => {
					extract_names(declarator.id).forEach(name => {
						this.declarations.set(name, node);
						if (declarator.init) this.initialised_declarations.add(name);
					});
				});
			}
		} else {
			this.declarations.set(node.id.name, node);
		}
	}

	find_owner(name) {
		if (this.declarations.has(name)) return this;
		return this.parent && this.parent.find_owner(name);
	}

	has(name) {
		return (
			this.declarations.has(name) || (this.parent && this.parent.has(name))
		);
	}
}

function extract_names(param) {
	return extract_identifiers(param).map(node => node.name);
}

function extract_identifiers(param) {
	const nodes = [];
	extractors[param.type] && extractors[param.type](nodes, param);
	return nodes;
}

const extractors = {
	Identifier(nodes, param) {
		nodes.push(param);
	},

	MemberExpression(nodes, param) {
		let object = param;
		while (object.type === 'MemberExpression') object = object.object;
		nodes.push(object);
	},

	ObjectPattern(nodes, param) {
		param.properties.forEach((prop) => {
			if (prop.type === 'RestElement') {
				nodes.push(prop.argument);
			} else {
				extractors[prop.value.type](nodes, prop.value);
			}
		});
	},

	ArrayPattern(nodes, param) {
		param.elements.forEach((element) => {
			if (element) extractors[element.type](nodes, element);
		});
	},

	RestElement(nodes, param) {
		extractors[param.argument.type](nodes, param.argument);
	},

	AssignmentPattern(nodes, param) {
		extractors[param.left.type](nodes, param.left);
	}
};

var charToInteger = {};
var chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=';
for (var i = 0; i < chars.length; i++) {
    charToInteger[chars.charCodeAt(i)] = i;
}
function decode(mappings) {
    var decoded = [];
    var line = [];
    var segment = [
        0,
        0,
        0,
        0,
        0,
    ];
    var j = 0;
    for (var i = 0, shift = 0, value = 0; i < mappings.length; i++) {
        var c = mappings.charCodeAt(i);
        if (c === 44) { // ","
            segmentify(line, segment, j);
            j = 0;
        }
        else if (c === 59) { // ";"
            segmentify(line, segment, j);
            j = 0;
            decoded.push(line);
            line = [];
            segment[0] = 0;
        }
        else {
            var integer = charToInteger[c];
            if (integer === undefined) {
                throw new Error('Invalid character (' + String.fromCharCode(c) + ')');
            }
            var hasContinuationBit = integer & 32;
            integer &= 31;
            value += integer << shift;
            if (hasContinuationBit) {
                shift += 5;
            }
            else {
                var shouldNegate = value & 1;
                value >>>= 1;
                if (shouldNegate) {
                    value = value === 0 ? -0x80000000 : -value;
                }
                segment[j] += value;
                j++;
                value = shift = 0; // reset
            }
        }
    }
    segmentify(line, segment, j);
    decoded.push(line);
    return decoded;
}
function segmentify(line, segment, j) {
    // This looks ugly, but we're creating specialized arrays with a specific
    // length. This is much faster than creating a new array (which v8 expands to
    // a capacity of 17 after pushing the first item), or slicing out a subarray
    // (which is slow). Length 4 is assumed to be the most frequent, followed by
    // length 5 (since not everything will have an associated name), followed by
    // length 1 (it's probably rare for a source substring to not have an
    // associated segment data).
    if (j === 4)
        line.push([segment[0], segment[1], segment[2], segment[3]]);
    else if (j === 5)
        line.push([segment[0], segment[1], segment[2], segment[3], segment[4]]);
    else if (j === 1)
        line.push([segment[0]]);
}
function encode(decoded) {
    var sourceFileIndex = 0; // second field
    var sourceCodeLine = 0; // third field
    var sourceCodeColumn = 0; // fourth field
    var nameIndex = 0; // fifth field
    var mappings = '';
    for (var i = 0; i < decoded.length; i++) {
        var line = decoded[i];
        if (i > 0)
            mappings += ';';
        if (line.length === 0)
            continue;
        var generatedCodeColumn = 0; // first field
        var lineMappings = [];
        for (var _i = 0, line_1 = line; _i < line_1.length; _i++) {
            var segment = line_1[_i];
            var segmentMappings = encodeInteger(segment[0] - generatedCodeColumn);
            generatedCodeColumn = segment[0];
            if (segment.length > 1) {
                segmentMappings +=
                    encodeInteger(segment[1] - sourceFileIndex) +
                        encodeInteger(segment[2] - sourceCodeLine) +
                        encodeInteger(segment[3] - sourceCodeColumn);
                sourceFileIndex = segment[1];
                sourceCodeLine = segment[2];
                sourceCodeColumn = segment[3];
            }
            if (segment.length === 5) {
                segmentMappings += encodeInteger(segment[4] - nameIndex);
                nameIndex = segment[4];
            }
            lineMappings.push(segmentMappings);
        }
        mappings += lineMappings.join(',');
    }
    return mappings;
}
function encodeInteger(num) {
    var result = '';
    num = num < 0 ? (-num << 1) | 1 : num << 1;
    do {
        var clamped = num & 31;
        num >>>= 5;
        if (num > 0) {
            clamped |= 32;
        }
        result += chars[clamped];
    } while (num > 0);
    return result;
}

// generate an ID that is, to all intents and purposes, unique
const id = (Math.round(Math.random() * 1e20)).toString(36);
const re = new RegExp(`_${id}_(?:(\\d+)|(AT)|(HASH))_(\\w+)?`, 'g');

const get_comment_handlers = (comments, raw) => ({

	// pass to acorn options
	onComment: (block, value, start, end) => {
		if (block && /\n/.test(value)) {
			let a = start;
			while (a > 0 && raw[a - 1] !== '\n') a -= 1;

			let b = a;
			while (/[ \t]/.test(raw[b])) b += 1;

			const indentation = raw.slice(a, b);
			value = value.replace(new RegExp(`^${indentation}`, 'gm'), '');
		}

		comments.push({ type: block ? 'Block' : 'Line', value, start, end });
	},

	// pass to estree-walker options
	enter(node) {
		let comment;

		while (comments[0] && comments[0].start < (node ).start) {
			comment = comments.shift();

			comment.value = comment.value.replace(re, (match, id, at, hash, value) => {
				if (hash) return `#${value}`;
				if (at) return `@${value}`;

				return match;
			});

			const next = comments[0] || node;
			(comment ).has_trailing_newline = (
				comment.type === 'Line' ||
				/\n/.test(raw.slice(comment.end, (next ).start))
			);

			(node.leadingComments || (node.leadingComments = [])).push(comment);
		}
	},
	leave(node) {
		if (comments[0]) {
			const slice = raw.slice((node ).end, comments[0].start);

			if (/^[,) \t]*$/.test(slice)) {
				node.trailingComments = [comments.shift()];
			}
		}
	}

});

function handle(node, state) {
	const handler = handlers[node.type];

	if (!handler) {
		throw new Error(`Not implemented ${node.type}`);
	}

	const result = handler(node, state);

	if (node.leadingComments) {
		result.unshift(c(node.leadingComments.map(comment => comment.type === 'Block'
			? `/*${comment.value}*/${(comment ).has_trailing_newline ? `\n${state.indent}` : ` `}`
			: `//${comment.value}${(comment ).has_trailing_newline ? `\n${state.indent}` : ` `}`).join(``)));
	}

	if (node.trailingComments) {
		state.comments.push(node.trailingComments[0]); // there is only ever one
	}

	return result;
}

function c(content, node) {
	return {
		content,
		loc: node && node.loc,
		has_newline: /\n/.test(content)
	};
}

const OPERATOR_PRECEDENCE = {
	'||': 2,
	'&&': 3,
	'??': 4,
	'|': 5,
	'^': 6,
	'&': 7,
	'==': 8,
	'!=': 8,
	'===': 8,
	'!==': 8,
	'<': 9,
	'>': 9,
	'<=': 9,
	'>=': 9,
	in: 9,
	instanceof: 9,
	'<<': 10,
	'>>': 10,
	'>>>': 10,
	'+': 11,
	'-': 11,
	'*': 12,
	'%': 12,
	'/': 12,
	'**': 13,
};

const EXPRESSIONS_PRECEDENCE = {
	ArrayExpression: 20,
	TaggedTemplateExpression: 20,
	ThisExpression: 20,
	Identifier: 20,
	Literal: 18,
	TemplateLiteral: 20,
	Super: 20,
	SequenceExpression: 20,
	MemberExpression: 19,
	CallExpression: 19,
	NewExpression: 19,
	AwaitExpression: 17,
	ClassExpression: 17,
	FunctionExpression: 17,
	ObjectExpression: 17,
	UpdateExpression: 16,
	UnaryExpression: 15,
	BinaryExpression: 14,
	LogicalExpression: 13,
	ConditionalExpression: 4,
	ArrowFunctionExpression: 3,
	AssignmentExpression: 3,
	YieldExpression: 2,
	RestElement: 1
};

function needs_parens(node, parent, is_right) {
	// special case where logical expressions and coalesce expressions cannot be mixed,
	// either of them need to be wrapped with parentheses
	if (
		node.type === 'LogicalExpression' &&
		parent.type === 'LogicalExpression' &&
		((parent.operator === '??' && node.operator !== '??') ||
			(parent.operator !== '??' && node.operator === '??'))
	) {
		return true;
	}

	const precedence = EXPRESSIONS_PRECEDENCE[node.type];
	const parent_precedence = EXPRESSIONS_PRECEDENCE[parent.type];

	if (precedence !== parent_precedence) {
		// Different node types
		return (
			(!is_right &&
				precedence === 15 &&
				parent_precedence === 14 &&
				parent.operator === '**') ||
			precedence < parent_precedence
		);
	}

	if (precedence !== 13 && precedence !== 14) {
		// Not a `LogicalExpression` or `BinaryExpression`
		return false;
	}

	if ((node ).operator === '**' && parent.operator === '**') {
		// Exponentiation operator has right-to-left associativity
		return !is_right;
	}

	if (is_right) {
		// Parenthesis are used if both operators have the same precedence
		return (
			OPERATOR_PRECEDENCE[(node ).operator] <=
			OPERATOR_PRECEDENCE[parent.operator]
		);
	}

	return (
		OPERATOR_PRECEDENCE[(node ).operator] <
		OPERATOR_PRECEDENCE[parent.operator]
	);
}

function has_call_expression(node) {
	while (node) {
		if (node.type[0] === 'CallExpression') {
			return true;
		} else if (node.type === 'MemberExpression') {
			node = node.object;
		} else {
			return false;
		}
	}
}

const has_newline = (chunks) => {
	for (let i = 0; i < chunks.length; i += 1) {
		if (chunks[i].has_newline) return true;
	}
	return false;
};

const get_length = (chunks) => {
	let total = 0;
	for (let i = 0; i < chunks.length; i += 1) {
		total += chunks[i].content.length;
	}
	return total;
};

const sum = (a, b) => a + b;

const join = (nodes, separator) => {
	if (nodes.length === 0) return [];
	const joined = [...nodes[0]];
	for (let i = 1; i < nodes.length; i += 1) {
		joined.push(separator, ...nodes[i] );
	}
	return joined;
};

const scoped = (fn) => {
	return (node, state) => {
		return fn(node, {
			...state,
			scope: state.scope_map.get(node)
		});
	};
};

const deconflict = (name, names) => {
	const original = name;
	let i = 1;

	while (names.has(name)) {
		name = `${original}$${i++}`;
	}

	return name;
};

const handle_body = (nodes, state) => {
	const chunks = [];

	const body = nodes.map(statement => {
		const chunks = handle(statement, {
			...state,
			indent: state.indent
		});

		let add_newline = false;

		while (state.comments.length) {
			const comment = state.comments.shift();
			const prefix = add_newline ? `\n${state.indent}` : ` `;

			chunks.push(c(comment.type === 'Block'
				? `${prefix}/*${comment.value}*/`
				: `${prefix}//${comment.value}`));

			add_newline = (comment.type === 'Line');
		}

		return chunks;
	});

	let needed_padding = false;

	for (let i = 0; i < body.length; i += 1) {
		const needs_padding = has_newline(body[i]);

		if (i > 0) {
			chunks.push(
				c(needs_padding || needed_padding ? `\n\n${state.indent}` : `\n${state.indent}`)
			);
		}

		chunks.push(
			...body[i]
		);

		needed_padding = needs_padding;
	}

	return chunks;
};

const handle_var_declaration = (node, state) => {
	const chunks = [c(`${node.kind} `)];

	const declarators = node.declarations.map(d => handle(d, {
		...state,
		indent: state.indent + (node.declarations.length === 1 ? '' : '\t')
	}));

	const multiple_lines = (
		declarators.some(has_newline) ||
		(declarators.map(get_length).reduce(sum, 0) + (state.indent.length + declarators.length - 1) * 2) > 80
	);

	const separator = c(multiple_lines ? `,\n${state.indent}\t` : ', ');

	if (multiple_lines) {
		chunks.push(...join(declarators, separator));
	} else {
		chunks.push(
			...join(declarators, separator)
		);
	}

	return chunks;
};

const handlers = {
	Program(node, state) {
		return handle_body(node.body, state);
	},

	BlockStatement: scoped((node, state) => {
		return [
			c(`{\n${state.indent}\t`),
			...handle_body(node.body, { ...state, indent: state.indent + '\t' }),
			c(`\n${state.indent}}`)
		];
	}),

	EmptyStatement(node, state) {
		return [];
	},

	ParenthesizedExpression(node, state) {
		return handle(node.expression, state);
	},

	ExpressionStatement(node, state) {
		if (
			node.expression.type === 'AssignmentExpression' &&
			node.expression.left.type === 'ObjectPattern'
		) {
			// is an AssignmentExpression to an ObjectPattern
			return [
				c('('),
				...handle(node.expression, state),
				c(');')
			];
		}

		return [
			...handle(node.expression, state),
			c(';')
		];
	},

	IfStatement(node, state) {
		const chunks = [
			c('if ('),
			...handle(node.test, state),
			c(') '),
			...handle(node.consequent, state)
		];

		if (node.alternate) {
			chunks.push(
				c(' else '),
				...handle(node.alternate, state)
			);
		}

		return chunks;
	},

	LabeledStatement(node, state) {
		return [
			...handle(node.label, state),
			c(': '),
			...handle(node.body, state)
		];
	},

	BreakStatement(node, state) {
		return node.label
			? [c('break '), ...handle(node.label, state), c(';')]
			: [c('break;')];
	},

	ContinueStatement(node, state) {
		return node.label
			? [c('continue '), ...handle(node.label, state), c(';')]
			: [c('continue;')];
	},

	WithStatement(node, state) {
		return [
			c('with ('),
			...handle(node.object, state),
			c(') '),
			...handle(node.body, state)
		];
	},

	SwitchStatement(node, state) {
		const chunks = [
			c('switch ('),
			...handle(node.discriminant, state),
			c(') {')
		];

		node.cases.forEach(block => {
			if (block.test) {
				chunks.push(
					c(`\n${state.indent}\tcase `),
					...handle(block.test, { ...state, indent: `${state.indent}\t` }),
					c(':')
				);
			} else {
				chunks.push(c(`\n${state.indent}\tdefault:`));
			}

			block.consequent.forEach(statement => {
				chunks.push(
					c(`\n${state.indent}\t\t`),
					...handle(statement, { ...state, indent: `${state.indent}\t\t` })
				);
			});
		});

		chunks.push(c(`\n${state.indent}}`));

		return chunks;
	},

	ReturnStatement(node, state) {
		if (node.argument) {
			return [
				c('return '),
				...handle(node.argument, state),
				c(';')
			];
		} else {
			return [c('return;')];
		}
	},

	ThrowStatement(node, state) {
		return [
			c('throw '),
			...handle(node.argument, state),
			c(';')
		];
	},

	TryStatement(node, state) {
		const chunks = [
			c('try '),
			...handle(node.block, state)
		];

		if (node.handler) {
			if (node.handler.param) {
				chunks.push(
					c(' catch('),
					...handle(node.handler.param, state),
					c(') ')
				);
			} else {
				chunks.push(c(' catch '));
			}

			chunks.push(...handle(node.handler.body, state));
		}

		if (node.finalizer) {
			chunks.push(c(' finally '), ...handle(node.finalizer, state));
		}

		return chunks;
	},

	WhileStatement(node, state) {
		return [
			c('while ('),
			...handle(node.test, state),
			c(') '),
			...handle(node.body, state)
		];
	},

	DoWhileStatement(node, state) {
		return [
			c('do '),
			...handle(node.body, state),
			c(' while ('),
			...handle(node.test, state),
			c(');')
		];
	},

	ForStatement: scoped((node, state) => {
		const chunks = [c('for (')];

		if (node.init) {
			if ((node.init ).type === 'VariableDeclaration') {
				chunks.push(...handle_var_declaration(node.init , state));
			} else {
				chunks.push(...handle(node.init, state));
			}
		}

		chunks.push(c('; '));
		if (node.test) chunks.push(...handle(node.test, state));
		chunks.push(c('; '));
		if (node.update) chunks.push(...handle(node.update, state));

		chunks.push(
			c(') '),
			...handle(node.body, state)
		);

		return chunks;
	}),

	ForInStatement: scoped((node, state) => {
		const chunks = [
			c(`for ${(node ).await ? 'await ' : ''}(`)
		];

		if ((node.left ).type === 'VariableDeclaration') {
			chunks.push(...handle_var_declaration(node.left , state));
		} else {
			chunks.push(...handle(node.left, state));
		}

		chunks.push(
			c(node.type === 'ForInStatement' ? ` in ` : ` of `),
			...handle(node.right, state),
			c(') '),
			...handle(node.body, state)
		);

		return chunks;
	}),

	DebuggerStatement(node, state) {
		return [c('debugger', node), c(';')];
	},

	FunctionDeclaration: scoped((node, state) => {
		const chunks = [];

		if (node.async) chunks.push(c('async '));
		chunks.push(c(node.generator ? 'function* ' : 'function '));
		if (node.id) chunks.push(...handle(node.id, state));
		chunks.push(c('('));

		const params = node.params.map(p => handle(p, {
			...state,
			indent: state.indent + '\t'
		}));

		const multiple_lines = (
			params.some(has_newline) ||
			(params.map(get_length).reduce(sum, 0) + (state.indent.length + params.length - 1) * 2) > 80
		);

		const separator = c(multiple_lines ? `,\n${state.indent}` : ', ');

		if (multiple_lines) {
			chunks.push(
				c(`\n${state.indent}\t`),
				...join(params, separator),
				c(`\n${state.indent}`)
			);
		} else {
			chunks.push(
				...join(params, separator)
			);
		}

		chunks.push(
			c(') '),
			...handle(node.body, state)
		);

		return chunks;
	}),

	VariableDeclaration(node, state) {
		return handle_var_declaration(node, state).concat(c(';'));
	},

	VariableDeclarator(node, state) {
		if (node.init) {
			return [
				...handle(node.id, state),
				c(' = '),
				...handle(node.init, state)
			];
		} else {
			return handle(node.id, state);
		}
	},

	ClassDeclaration(node, state) {
		const chunks = [c('class ')];

		if (node.id) chunks.push(...handle(node.id, state), c(' '));

		if (node.superClass) {
			chunks.push(
				c('extends '),
				...handle(node.superClass, state),
				c(' ')
			);
		}

		chunks.push(...handle(node.body, state));

		return chunks;
	},

	ImportDeclaration(node, state) {
		const chunks = [c('import ')];

		const { length } = node.specifiers;
		const source = handle(node.source, state);

		if (length > 0) {
			let i = 0;

			while (i < length) {
				if (i > 0) {
					chunks.push(c(', '));
				}

				const specifier = node.specifiers[i];

				if (specifier.type === 'ImportDefaultSpecifier') {
					chunks.push(c(specifier.local.name, specifier));
					i += 1;
				} else if (specifier.type === 'ImportNamespaceSpecifier') {
					chunks.push(c('* as ' + specifier.local.name, specifier));
					i += 1;
				} else {
					break;
				}
			}

			if (i < length) {
				// we have named specifiers
				const specifiers = node.specifiers.slice(i).map((specifier) => {
					const name = handle(specifier.imported, state)[0];
					const as = handle(specifier.local, state)[0];

					if (name.content === as.content) {
						return [as];
					}

					return [name, c(' as '), as];
				});

				const width = get_length(chunks) + specifiers.map(get_length).reduce(sum, 0) + (2 * specifiers.length) + 6 + get_length(source);

				if (width > 80) {
					chunks.push(
						c(`{\n\t`),
						...join(specifiers, c(',\n\t')),
						c('\n}')
					);
				} else {
					chunks.push(
						c(`{ `),
						...join(specifiers, c(', ')),
						c(' }')
					);
				}
			}

			chunks.push(c(' from '));
		}

		chunks.push(
			...source,
			c(';')
		);

		return chunks;
	},

	ImportExpression(node, state) {
		return [c('import('), ...handle(node.source, state), c(')')];
	},

	ExportDefaultDeclaration(node, state) {
		const chunks = [
			c(`export default `),
			...handle(node.declaration, state)
		];

		if (node.declaration.type !== 'FunctionDeclaration') {
			chunks.push(c(';'));
		}

		return chunks;
	},

	ExportNamedDeclaration(node, state) {
		const chunks = [c('export ')];

		if (node.declaration) {
			chunks.push(...handle(node.declaration, state));
		} else {
			const specifiers = node.specifiers.map(specifier => {
				const name = handle(specifier.local, state)[0];
				const as = handle(specifier.exported, state)[0];

				if (name.content === as.content) {
					return [name];
				}

				return [name, c(' as '), as];
			});

			const width = 7 + specifiers.map(get_length).reduce(sum, 0) + 2 * specifiers.length;

			if (width > 80) {
				chunks.push(
					c('{\n\t'),
					...join(specifiers, c(',\n\t')),
					c('\n}')
				);
			} else {
				chunks.push(
					c('{ '),
					...join(specifiers, c(', ')),
					c(' }')
				);
			}

			if (node.source) {
				chunks.push(
					c(' from '),
					...handle(node.source, state)
				);
			}
		}

		chunks.push(c(';'));

		return chunks;
	},

	ExportAllDeclaration(node, state) {
		return [
			c(`export * from `),
			...handle(node.source, state),
			c(`;`)
		];
	},

	MethodDefinition(node, state) {
		const chunks = [];

		if (node.static) {
			chunks.push(c('static '));
		}

		if (node.kind === 'get' || node.kind === 'set') {
			// Getter or setter
			chunks.push(c(node.kind + ' '));
		}

		if (node.value.async) {
			chunks.push(c('async '));
		}

		if (node.value.generator) {
			chunks.push(c('*'));
		}

		if (node.computed) {
			chunks.push(
				c('['),
				...handle(node.key, state),
				c(']')
			);
		} else {
			chunks.push(...handle(node.key, state));
		}

		chunks.push(c('('));

		const { params } = node.value;
		for (let i = 0; i < params.length; i += 1) {
			chunks.push(...handle(params[i], state));
			if (i < params.length - 1) chunks.push(c(', '));
		}

		chunks.push(
			c(') '),
			...handle(node.value.body, state)
		);

		return chunks;
	},

	ArrowFunctionExpression: scoped((node, state) => {
		const chunks = [];

		if (node.async) chunks.push(c('async '));

		if (node.params.length === 1 && node.params[0].type === 'Identifier') {
			chunks.push(...handle(node.params[0], state));
		} else {
			const params = node.params.map(param => handle(param, {
				...state,
				indent: state.indent + '\t'
			}));

			chunks.push(
				c('('),
				...join(params, c(', ')),
				c(')')
			);
		}

		chunks.push(c(' => '));

		if (node.body.type === 'ObjectExpression') {
			chunks.push(
				c('('),
				...handle(node.body, state),
				c(')')
			);
		} else {
			chunks.push(...handle(node.body, state));
		}

		return chunks;
	}),

	ThisExpression(node, state) {
		return [c('this', node)];
	},

	Super(node, state) {
		return [c('super', node)];
	},

	RestElement(node, state) {
		return [c('...'), ...handle(node.argument, state)];
	},

	YieldExpression(node, state) {
		if (node.argument) {
			return [c(node.delegate ? `yield* ` : `yield `), ...handle(node.argument, state)];
		}

		return [c(node.delegate ? `yield*` : `yield`)];
	},

	AwaitExpression(node, state) {
		if (node.argument) {
			const precedence = EXPRESSIONS_PRECEDENCE[node.argument.type];

			if (precedence && (precedence < EXPRESSIONS_PRECEDENCE.AwaitExpression)) {
				return [c('await ('), ...handle(node.argument, state), c(')')];
			} else {
				return [c('await '), ...handle(node.argument, state)];
			}
		}

		return [c('await')];
	},

	TemplateLiteral(node, state) {
		const chunks = [c('`')];

		const { quasis, expressions } = node;

		for (let i = 0; i < expressions.length; i++) {
			chunks.push(
				c(quasis[i].value.raw),
				c('${'),
				...handle(expressions[i], state),
				c('}')
			);
		}

		chunks.push(
			c(quasis[quasis.length - 1].value.raw),
			c('`')
		);

		return chunks;
	},

	TaggedTemplateExpression(node, state) {
		return handle(node.tag, state).concat(handle(node.quasi, state));
	},

	ArrayExpression(node, state) {
		const chunks = [c('[')];

		const elements = [];
		let sparse_commas = [];

		for (let i = 0; i < node.elements.length; i += 1) {
			// can't use map/forEach because of sparse arrays
			const element = node.elements[i];
			if (element) {
				elements.push([...sparse_commas, ...handle(element, {
					...state,
					indent: state.indent + '\t'
				})]);
				sparse_commas = [];
			} else {
				sparse_commas.push(c(','));
			}
		}

		const multiple_lines = (
			elements.some(has_newline) ||
			(elements.map(get_length).reduce(sum, 0) + (state.indent.length + elements.length - 1) * 2) > 80
		);

		if (multiple_lines) {
			chunks.push(
				c(`\n${state.indent}\t`),
				...join(elements, c(`,\n${state.indent}\t`)),
				c(`\n${state.indent}`),
				...sparse_commas
			);
		} else {
			chunks.push(...join(elements, c(', ')), ...sparse_commas);
		}

		chunks.push(c(']'));

		return chunks;
	},

	ObjectExpression(node, state) {
		if (node.properties.length === 0) {
			return [c('{}')];
		}

		let has_inline_comment = false;

		const chunks = [];
		const separator = c(', ');

		node.properties.forEach((p, i) => {
			chunks.push(...handle(p, {
				...state,
				indent: state.indent + '\t'
			}));

			if (state.comments.length) {
				// TODO generalise this, so it works with ArrayExpressions and other things.
				// At present, stuff will just get appended to the closest statement/declaration
				chunks.push(c(', '));

				while (state.comments.length) {
					const comment = state.comments.shift();

					chunks.push(c(comment.type === 'Block'
						? `/*${comment.value}*/\n${state.indent}\t`
						: `//${comment.value}\n${state.indent}\t`));

					if (comment.type === 'Line') {
						has_inline_comment = true;
					}
				}
			} else {
				if (i < node.properties.length - 1) {
					chunks.push(separator);
				}
			}
		});

		const multiple_lines = (
			has_inline_comment ||
			has_newline(chunks) ||
			get_length(chunks) > 40
		);

		if (multiple_lines) {
			separator.content = `,\n${state.indent}\t`;
		}

		return [
			c(multiple_lines ? `{\n${state.indent}\t` : `{ `),
			...chunks,
			c(multiple_lines ? `\n${state.indent}}` : ` }`)
		];
	},

	Property(node, state) {
		const value = handle(node.value, state);

		if (node.key === node.value) {
			return value;
		}

		// special case
		if (
			!node.computed &&
			node.value.type === 'AssignmentPattern' &&
			node.value.left.type === 'Identifier' &&
			node.value.left.name === (node.key ).name
		) {
			return value;
		}

		if (node.value.type === 'Identifier' && (
			(node.key.type === 'Identifier' && node.key.name === value[0].content) ||
			(node.key.type === 'Literal' && node.key.value === value[0].content)
		)) {
			return value;
		}

		const key = handle(node.key, state);

		if (node.value.type === 'FunctionExpression' && !node.value.id) {
			state = {
				...state,
				scope: state.scope_map.get(node.value)
			};

			const chunks = node.kind !== 'init'
				? [c(`${node.kind} `)]
				: [];

			if (node.value.async) {
				chunks.push(c('async '));
			}
			if (node.value.generator) {
				chunks.push(c('*'));
			}

			chunks.push(
				...(node.computed ? [c('['), ...key, c(']')] : key),
				c('('),
				...join((node.value ).params.map(param => handle(param, state)), c(', ')),
				c(') '),
				...handle((node.value ).body, state)
			);

			return chunks;
		}

		if (node.computed) {
			return [
				c('['),
				...key,
				c(']: '),
				...value
			];
		}

		return [
			...key,
			c(': '),
			...value
		];
	},

	ObjectPattern(node, state) {
		const chunks = [c('{ ')];

		for (let i = 0; i < node.properties.length; i += 1) {
			chunks.push(...handle(node.properties[i], state));
			if (i < node.properties.length - 1) chunks.push(c(', '));
		}

		chunks.push(c(' }'));

		return chunks;
	},

	SequenceExpression(node, state) {
		const expressions = node.expressions.map(e => handle(e, state));

		return [
			c('('),
			...join(expressions, c(', ')),
			c(')')
		];
	},

	UnaryExpression(node, state) {
		const chunks = [c(node.operator)];

		if (node.operator.length > 1) {
			chunks.push(c(' '));
		}

		if (
			EXPRESSIONS_PRECEDENCE[node.argument.type] <
			EXPRESSIONS_PRECEDENCE.UnaryExpression
		) {
			chunks.push(
				c('('),
				...handle(node.argument, state),
				c(')')
			);
		} else {
			chunks.push(...handle(node.argument, state));
		}

		return chunks;
	},

	UpdateExpression(node, state) {
		return node.prefix
			? [c(node.operator), ...handle(node.argument, state)]
			: [...handle(node.argument, state), c(node.operator)];
	},

	AssignmentExpression(node, state) {
		return [
			...handle(node.left, state),
			c(` ${node.operator || '='} `),
			...handle(node.right, state)
		];
	},

	BinaryExpression(node, state) {
		const chunks = [];

		// TODO
		// const is_in = node.operator === 'in';
		// if (is_in) {
		// 	// Avoids confusion in `for` loops initializers
		// 	chunks.push(c('('));
		// }

		if (needs_parens(node.left, node, false)) {
			chunks.push(
				c('('),
				...handle(node.left, state),
				c(')')
			);
		} else {
			chunks.push(...handle(node.left, state));
		}

		chunks.push(c(` ${node.operator} `));

		if (needs_parens(node.right, node, true)) {
			chunks.push(
				c('('),
				...handle(node.right, state),
				c(')')
			);
		} else {
			chunks.push(...handle(node.right, state));
		}

		return chunks;
	},

	ConditionalExpression(node, state) {
		const chunks = [];

		if (
			EXPRESSIONS_PRECEDENCE[node.test.type] >
			EXPRESSIONS_PRECEDENCE.ConditionalExpression
		) {
			chunks.push(...handle(node.test, state));
		} else {
			chunks.push(
				c('('),
				...handle(node.test, state),
				c(')')
			);
		}

		const child_state = { ...state, indent: state.indent + '\t' };

		const consequent = handle(node.consequent, child_state);
		const alternate = handle(node.alternate, child_state);

		const multiple_lines = (
			has_newline(consequent) || has_newline(alternate) ||
			get_length(chunks) + get_length(consequent) + get_length(alternate) > 50
		);

		if (multiple_lines) {
			chunks.push(
				c(`\n${state.indent}? `),
				...consequent,
				c(`\n${state.indent}: `),
				...alternate
			);
		} else {
			chunks.push(
				c(` ? `),
				...consequent,
				c(` : `),
				...alternate
			);
		}

		return chunks;
	},

	NewExpression(node, state) {
		const chunks = [c('new ')];

		if (
			EXPRESSIONS_PRECEDENCE[node.callee.type] <
			EXPRESSIONS_PRECEDENCE.CallExpression || has_call_expression(node.callee)
		) {
			chunks.push(
				c('('),
				...handle(node.callee, state),
				c(')')
			);
		} else {
			chunks.push(...handle(node.callee, state));
		}

		// TODO this is copied from CallExpression — DRY it out
		const args = node.arguments.map(arg => handle(arg, {
			...state,
			indent: state.indent + '\t'
		}));

		const separator = args.some(has_newline) // TODO or length exceeds 80
			? c(',\n' + state.indent)
			: c(', ');

		chunks.push(
			c('('),
			...join(args, separator) ,
			c(')')
		);

		return chunks;
	},

	ChainExpression(node, state) {
		return handle(node.expression, state);
	},

	CallExpression(node, state) {
		const chunks = [];

		if (
			EXPRESSIONS_PRECEDENCE[node.callee.type] <
			EXPRESSIONS_PRECEDENCE.CallExpression
		) {
			chunks.push(
				c('('),
				...handle(node.callee, state),
				c(')')
			);
		} else {
			chunks.push(...handle(node.callee, state));
		}

		if ((node ).optional) {
			chunks.push(c('?.'));
		}

		const args = node.arguments.map(arg => handle(arg, state));

		const multiple_lines = args.slice(0, -1).some(has_newline); // TODO or length exceeds 80

		if (multiple_lines) {
			// need to handle args again. TODO find alternative approach?
			const args = node.arguments.map(arg => handle(arg, {
				...state,
				indent: `${state.indent}\t`
			}));

			chunks.push(
				c(`(\n${state.indent}\t`),
				...join(args, c(`,\n${state.indent}\t`)),
				c(`\n${state.indent})`)
			);
		} else {
			chunks.push(
				c('('),
				...join(args, c(', ')),
				c(')')
			);
		}

		return chunks;
	},

	MemberExpression(node, state) {
		const chunks = [];

		if (EXPRESSIONS_PRECEDENCE[node.object.type] < EXPRESSIONS_PRECEDENCE.MemberExpression) {
			chunks.push(
				c('('),
				...handle(node.object, state),
				c(')')
			);
		} else {
			chunks.push(...handle(node.object, state));
		}

		if (node.computed) {
			if (node.optional) {
				chunks.push(c('?.'));
			}
			chunks.push(
				c('['),
				...handle(node.property, state),
				c(']')
			);
		} else {
			chunks.push(
				c(node.optional ? '?.' : '.'),
				...handle(node.property, state)
			);
		}

		return chunks;
	},

	MetaProperty(node, state) {
		return [...handle(node.meta, state), c('.'), ...handle(node.property, state)];
	},

	Identifier(node, state) {
		let name = node.name;

		if (name[0] === '@') {
			name = state.getName(name.slice(1));
		} else if (node.name[0] === '#') {
			const owner = state.scope.find_owner(node.name);

			if (!owner) {
				throw new Error(`Could not find owner for node`);
			}

			if (!state.deconflicted.has(owner)) {
				state.deconflicted.set(owner, new Map());
			}

			const deconflict_map = state.deconflicted.get(owner);

			if (!deconflict_map.has(node.name)) {
				deconflict_map.set(node.name, deconflict(node.name.slice(1), owner.references));
			}

			name = deconflict_map.get(node.name);
		}

		return [c(name, node)];
	},

	Literal(node, state) {
		if (typeof node.value === 'string') {
			return [
				// TODO do we need to handle weird unicode characters somehow?
				// str.replace(/\\u(\d{4})/g, (m, n) => String.fromCharCode(+n))
				c(JSON.stringify(node.value).replace(re, (_m, _i, at, hash, name) => {
					if (at)	return '@' + name;
					if (hash) return '#' + name;
					throw new Error(`this shouldn't happen`);
				}), node)
			];
		}

		const { regex } = node ; // TODO is this right?
		if (regex) {
			return [c(`/${regex.pattern}/${regex.flags}`, node)];
		}

		return [c(String(node.value), node)];
	}
};

handlers.ForOfStatement = handlers.ForInStatement;
handlers.FunctionExpression = handlers.FunctionDeclaration;
handlers.ClassExpression = handlers.ClassDeclaration;
handlers.ClassBody = handlers.BlockStatement;
handlers.SpreadElement = handlers.RestElement;
handlers.ArrayPattern = handlers.ArrayExpression;
handlers.LogicalExpression = handlers.BinaryExpression;
handlers.AssignmentPattern = handlers.AssignmentExpression;

let btoa$1 = () => {
	throw new Error('Unsupported environment: `window.btoa` or `Buffer` should be supported.');
};
if (typeof window !== 'undefined' && typeof window.btoa === 'function') {
	btoa$1 = (str) => window.btoa(unescape(encodeURIComponent(str)));
} else if (typeof Buffer === 'function') {
	btoa$1 = (str) => Buffer.from(str, 'utf-8').toString('base64');
}








function print(node, opts = {}) {
	if (Array.isArray(node)) {
		return print({
			type: 'Program',
			body: node
		} , opts);
	}

	const {
		getName = (x) => {
			throw new Error(`Unhandled sigil @${x}`);
		}
	} = opts;

	let { map: scope_map, scope } = analyze(node);
	const deconflicted = new WeakMap();

	const chunks = handle(node, {
		indent: '',
		getName,
		scope,
		scope_map,
		deconflicted,
		comments: []
	});

	

	let code = '';
	let mappings = [];
	let current_line = [];
	let current_column = 0;

	for (let i = 0; i < chunks.length; i += 1) {
		const chunk = chunks[i];

		code += chunk.content;

		if (chunk.loc) {
			current_line.push([
				current_column,
				0, // source index is always zero
				chunk.loc.start.line - 1,
				chunk.loc.start.column,
			]);
		}

		for (let i = 0; i < chunk.content.length; i += 1) {
			if (chunk.content[i] === '\n') {
				mappings.push(current_line);
				current_line = [];
				current_column = 0;
			} else {
				current_column += 1;
			}
		}

		if (chunk.loc) {
			current_line.push([
				current_column,
				0, // source index is always zero
				chunk.loc.end.line - 1,
				chunk.loc.end.column,
			]);
		}
	}

	mappings.push(current_line);

	const map = {
		version: 3,
		names: [] ,
		sources: [opts.sourceMapSource || null],
		sourcesContent: [opts.sourceMapContent || null],
		mappings: encode(mappings)
	};

	Object.defineProperties(map, {
		toString: {
			enumerable: false,
			value: function toString() {
				return JSON.stringify(this);
			}
		},
		toUrl: {
			enumerable: false,
			value: function toUrl() {
				return 'data:application/json;charset=utf-8;base64,' + btoa$1(this.toString());
			}
		}
	});

	return {
		code,
		map
	};
}

const sigils = {
	'@': 'AT',
	'#': 'HASH'
};

const join$1 = (strings) => {
	let str = strings[0];
	for (let i = 1; i < strings.length; i += 1) {
		str += `_${id}_${i - 1}_${strings[i]}`;
	}
	return str.replace(/([@#])(\w+)/g, (_m, sigil, name) => `_${id}_${sigils[sigil]}_${name}`);
};

const flatten_body = (array, target) => {
	for (let i = 0; i < array.length; i += 1) {
		const statement = array[i];
		if (Array.isArray(statement)) {
			flatten_body(statement, target);
			continue;
		}

		if (statement.type === 'ExpressionStatement') {
			if (statement.expression === EMPTY) continue;

			if (Array.isArray(statement.expression)) {
				// TODO this is hacktacular
				let node = statement.expression[0];
				while (Array.isArray(node)) node = node[0];
				if (node) node.leadingComments = statement.leadingComments;

				flatten_body(statement.expression, target);
				continue;
			}

			if (/(Expression|Literal)$/.test(statement.expression.type)) {
				target.push(statement);
				continue;
			}

			if (statement.leadingComments) statement.expression.leadingComments = statement.leadingComments;
			if (statement.trailingComments) statement.expression.trailingComments = statement.trailingComments;

			target.push(statement.expression);
			continue;
		}

		target.push(statement);
	}

	return target;
};

const flatten_properties = (array, target) => {
	for (let i = 0; i < array.length; i += 1) {
		const property = array[i];

		if (property.value === EMPTY) continue;

		if (property.key === property.value && Array.isArray(property.key)) {
			flatten_properties(property.key, target);
			continue;
		}

		target.push(property);
	}

	return target;
};

const flatten = (nodes, target) => {
	for (let i = 0; i < nodes.length; i += 1) {
		const node = nodes[i];

		if (node === EMPTY) continue;

		if (Array.isArray(node)) {
			flatten(node, target);
			continue;
		}

		target.push(node);
	}

	return target;
};

const EMPTY = { type: 'Empty' };

const acorn_opts = (comments, raw) => {
	const { onComment } = get_comment_handlers(comments, raw);
	return {
		ecmaVersion: 2020,
		sourceType: 'module',
		allowAwaitOutsideFunction: true,
		allowImportExportEverywhere: true,
		allowReturnOutsideFunction: true,
		onComment
	} ;
};

const inject = (raw, node, values, comments) => {
	comments.forEach(comment => {
		comment.value = comment.value.replace(re, (m, i) => +i in values ? values[+i] : m);
	});

	const { enter, leave } = get_comment_handlers(comments, raw);

	walk(node, {
		enter,

		leave(node, parent, key, index) {
			if (node.type === 'Identifier') {
				re.lastIndex = 0;
				const match = re.exec(node.name);

				if (match) {
					if (match[1]) {
						if (+match[1] in values) {
							let value = values[+match[1]];

							if (typeof value === 'string') {
								value = { type: 'Identifier', name: value, leadingComments: node.leadingComments, trailingComments: node.trailingComments };
							} else if (typeof value === 'number') {
								value = { type: 'Literal', value, leadingComments: node.leadingComments, trailingComments: node.trailingComments };
							}

							this.replace(value || EMPTY);
						}
					} else {
						node.name = `${match[2] ? `@` : `#`}${match[4]}`;
					}
				}
			}

			if (node.type === 'Literal') {
				if (typeof node.value === 'string') {
					re.lastIndex = 0;
					node.value = node.value.replace(re, (m, i) => +i in values ? values[+i] : m);
				}
			}

			if (node.type === 'TemplateElement') {
				re.lastIndex = 0;
				node.value.raw = (node.value.raw ).replace(re, (m, i) => +i in values ? values[+i] : m);
			}

			if (node.type === 'Program' || node.type === 'BlockStatement') {
				node.body = flatten_body(node.body, []);
			}

			if (node.type === 'ObjectExpression' || node.type === 'ObjectPattern') {
				node.properties = flatten_properties(node.properties, []);
			}

			if (node.type === 'ArrayExpression' || node.type === 'ArrayPattern') {
				node.elements = flatten(node.elements, []);
			}

			if (node.type === 'FunctionExpression' || node.type === 'FunctionDeclaration' || node.type === 'ArrowFunctionExpression') {
				node.params = flatten(node.params, []);
			}

			if (node.type === 'CallExpression' || node.type === 'NewExpression') {
				node.arguments = flatten(node.arguments, []);
			}

			if (node.type === 'ImportDeclaration' || node.type === 'ExportNamedDeclaration') {
				node.specifiers = flatten(node.specifiers, []);
			}

			if (node.type === 'ForStatement') {
				node.init = node.init === EMPTY ? null : node.init;
				node.test = node.test === EMPTY ? null : node.test;
				node.update = node.update === EMPTY ? null : node.update;
			}

			leave(node);
		}
	});
};

function b(strings, ...values) {
	const str = join$1(strings);
	const comments = [];

	try {
		const ast = parse(str,  acorn_opts(comments, str));

		inject(str, ast, values, comments);

		return ast.body;
	} catch (err) {
		handle_error(str, err);
	}
}

function x(strings, ...values) {
	const str = join$1(strings);
	const comments = [];

	try {
		const expression = parseExpressionAt(str, 0, acorn_opts(comments, str)) ;
		const match = /\S+/.exec(str.slice((expression ).end));
		if (match) {
			throw new Error(`Unexpected token '${match[0]}'`);
		}

		inject(str, expression, values, comments);

		return expression;
	} catch (err) {
		handle_error(str, err);
	}
}

function p(strings, ...values) {
	const str = `{${join$1(strings)}}`;
	const comments = [];

	try {
		const expression = parseExpressionAt(str, 0, acorn_opts(comments, str)) ;

		inject(str, expression, values, comments);

		return expression.properties[0];
	} catch (err) {
		handle_error(str, err);
	}
}

function handle_error(str, err) {
	// TODO location/code frame

	re.lastIndex = 0;

	str = str.replace(re, (m, i, at, hash, name) => {
		if (at) return `@${name}`;
		if (hash) return `#${name}`;

		return '${...}';
	});

	console.log(`failed to parse:\n${str}`);
	throw err;
}

const parse$1 = (source, opts) => {
	const comments = [];
	const { onComment, enter, leave } = get_comment_handlers(comments, source);
	const ast = parse(source, { onComment, ...opts });
	walk(ast , { enter, leave });
	return ast;
};

const parseExpressionAt$1 = (source, index, opts) => {
	const comments = [];
	const { onComment, enter, leave } = get_comment_handlers(comments, source);
	const ast = parseExpressionAt(source, index, { onComment, ...opts });
	walk(ast , { enter, leave });
	return ast;
};

const parse$2 = (source) => parse$1(source, {
    sourceType: 'module',
    ecmaVersion: 12,
    locations: true
});
const parse_expression_at = (source, index) => parseExpressionAt$1(source, index, {
    sourceType: 'module',
    ecmaVersion: 12,
    locations: true
});

const whitespace = /[ \t\r\n]/;
const dimensions = /^(?:offset|client)(?:Width|Height)$/;

function read_expression(parser) {
    try {
        const node = parse_expression_at(parser.template, parser.index);
        let num_parens = 0;
        for (let i = parser.index; i < node.start; i += 1) {
            if (parser.template[i] === '(')
                num_parens += 1;
        }
        let index = node.end;
        while (num_parens > 0) {
            const char = parser.template[index];
            if (char === ')') {
                num_parens -= 1;
            }
            else if (!whitespace.test(char)) {
                parser.error({
                    code: 'unexpected-token',
                    message: 'Expected )'
                }, index);
            }
            index += 1;
        }
        parser.index = index;
        return node;
    }
    catch (err) {
        parser.acorn_error(err);
    }
}

const script_closing_tag = '</script>';
function get_context(parser, attributes, start) {
    const context = attributes.find(attribute => attribute.name === 'context');
    if (!context)
        return 'default';
    if (context.value.length !== 1 || context.value[0].type !== 'Text') {
        parser.error({
            code: 'invalid-script',
            message: 'context attribute must be static'
        }, start);
    }
    const value = context.value[0].data;
    if (value !== 'module') {
        parser.error({
            code: 'invalid-script',
            message: 'If the context attribute is supplied, its value must be "module"'
        }, context.start);
    }
    return value;
}
function read_script(parser, start, attributes) {
    const script_start = parser.index;
    const script_end = parser.template.indexOf(script_closing_tag, script_start);
    if (script_end === -1) {
        parser.error({
            code: 'unclosed-script',
            message: '<script> must have a closing tag'
        });
    }
    const source = parser.template.slice(0, script_start).replace(/[^\n]/g, ' ') +
        parser.template.slice(script_start, script_end);
    parser.index = script_end + script_closing_tag.length;
    let ast;
    try {
        ast = parse$2(source);
    }
    catch (err) {
        parser.acorn_error(err);
    }
    // TODO is this necessary?
    ast.start = script_start;
    return {
        type: 'Script',
        start,
        end: parser.index,
        context: get_context(parser, attributes, start),
        content: ast
    };
}

var MIN_SIZE = 16 * 1024;
var SafeUint32Array = typeof Uint32Array !== 'undefined' ? Uint32Array : Array; // fallback on Array when TypedArray is not supported

var adoptBuffer = function adoptBuffer(buffer, size) {
    if (buffer === null || buffer.length < size) {
        return new SafeUint32Array(Math.max(size + 1024, MIN_SIZE));
    }

    return buffer;
};

// CSS Syntax Module Level 3
// https://www.w3.org/TR/css-syntax-3/
var TYPE = {
    EOF: 0,                 // <EOF-token>
    Ident: 1,               // <ident-token>
    Function: 2,            // <function-token>
    AtKeyword: 3,           // <at-keyword-token>
    Hash: 4,                // <hash-token>
    String: 5,              // <string-token>
    BadString: 6,           // <bad-string-token>
    Url: 7,                 // <url-token>
    BadUrl: 8,              // <bad-url-token>
    Delim: 9,               // <delim-token>
    Number: 10,             // <number-token>
    Percentage: 11,         // <percentage-token>
    Dimension: 12,          // <dimension-token>
    WhiteSpace: 13,         // <whitespace-token>
    CDO: 14,                // <CDO-token>
    CDC: 15,                // <CDC-token>
    Colon: 16,              // <colon-token>     :
    Semicolon: 17,          // <semicolon-token> ;
    Comma: 18,              // <comma-token>     ,
    LeftSquareBracket: 19,  // <[-token>
    RightSquareBracket: 20, // <]-token>
    LeftParenthesis: 21,    // <(-token>
    RightParenthesis: 22,   // <)-token>
    LeftCurlyBracket: 23,   // <{-token>
    RightCurlyBracket: 24,  // <}-token>
    Comment: 25
};

var NAME = Object.keys(TYPE).reduce(function(result, key) {
    result[TYPE[key]] = key;
    return result;
}, {});

var _const = {
    TYPE: TYPE,
    NAME: NAME
};

var EOF = 0;

// https://drafts.csswg.org/css-syntax-3/
// § 4.2. Definitions

// digit
// A code point between U+0030 DIGIT ZERO (0) and U+0039 DIGIT NINE (9).
function isDigit(code) {
    return code >= 0x0030 && code <= 0x0039;
}

// hex digit
// A digit, or a code point between U+0041 LATIN CAPITAL LETTER A (A) and U+0046 LATIN CAPITAL LETTER F (F),
// or a code point between U+0061 LATIN SMALL LETTER A (a) and U+0066 LATIN SMALL LETTER F (f).
function isHexDigit$1(code) {
    return (
        isDigit(code) || // 0 .. 9
        (code >= 0x0041 && code <= 0x0046) || // A .. F
        (code >= 0x0061 && code <= 0x0066)    // a .. f
    );
}

// uppercase letter
// A code point between U+0041 LATIN CAPITAL LETTER A (A) and U+005A LATIN CAPITAL LETTER Z (Z).
function isUppercaseLetter(code) {
    return code >= 0x0041 && code <= 0x005A;
}

// lowercase letter
// A code point between U+0061 LATIN SMALL LETTER A (a) and U+007A LATIN SMALL LETTER Z (z).
function isLowercaseLetter(code) {
    return code >= 0x0061 && code <= 0x007A;
}

// letter
// An uppercase letter or a lowercase letter.
function isLetter(code) {
    return isUppercaseLetter(code) || isLowercaseLetter(code);
}

// non-ASCII code point
// A code point with a value equal to or greater than U+0080 <control>.
function isNonAscii(code) {
    return code >= 0x0080;
}

// name-start code point
// A letter, a non-ASCII code point, or U+005F LOW LINE (_).
function isNameStart(code) {
    return isLetter(code) || isNonAscii(code) || code === 0x005F;
}

// name code point
// A name-start code point, a digit, or U+002D HYPHEN-MINUS (-).
function isName(code) {
    return isNameStart(code) || isDigit(code) || code === 0x002D;
}

// non-printable code point
// A code point between U+0000 NULL and U+0008 BACKSPACE, or U+000B LINE TABULATION,
// or a code point between U+000E SHIFT OUT and U+001F INFORMATION SEPARATOR ONE, or U+007F DELETE.
function isNonPrintable(code) {
    return (
        (code >= 0x0000 && code <= 0x0008) ||
        (code === 0x000B) ||
        (code >= 0x000E && code <= 0x001F) ||
        (code === 0x007F)
    );
}

// newline
// U+000A LINE FEED. Note that U+000D CARRIAGE RETURN and U+000C FORM FEED are not included in this definition,
// as they are converted to U+000A LINE FEED during preprocessing.
// TODO: we doesn't do a preprocessing, so check a code point for U+000D CARRIAGE RETURN and U+000C FORM FEED
function isNewline(code) {
    return code === 0x000A || code === 0x000D || code === 0x000C;
}

// whitespace
// A newline, U+0009 CHARACTER TABULATION, or U+0020 SPACE.
function isWhiteSpace(code) {
    return isNewline(code) || code === 0x0020 || code === 0x0009;
}

// § 4.3.8. Check if two code points are a valid escape
function isValidEscape(first, second) {
    // If the first code point is not U+005C REVERSE SOLIDUS (\), return false.
    if (first !== 0x005C) {
        return false;
    }

    // Otherwise, if the second code point is a newline or EOF, return false.
    if (isNewline(second) || second === EOF) {
        return false;
    }

    // Otherwise, return true.
    return true;
}

// § 4.3.9. Check if three code points would start an identifier
function isIdentifierStart$1(first, second, third) {
    // Look at the first code point:

    // U+002D HYPHEN-MINUS
    if (first === 0x002D) {
        // If the second code point is a name-start code point or a U+002D HYPHEN-MINUS,
        // or the second and third code points are a valid escape, return true. Otherwise, return false.
        return (
            isNameStart(second) ||
            second === 0x002D ||
            isValidEscape(second, third)
        );
    }

    // name-start code point
    if (isNameStart(first)) {
        // Return true.
        return true;
    }

    // U+005C REVERSE SOLIDUS (\)
    if (first === 0x005C) {
        // If the first and second code points are a valid escape, return true. Otherwise, return false.
        return isValidEscape(first, second);
    }

    // anything else
    // Return false.
    return false;
}

// § 4.3.10. Check if three code points would start a number
function isNumberStart(first, second, third) {
    // Look at the first code point:

    // U+002B PLUS SIGN (+)
    // U+002D HYPHEN-MINUS (-)
    if (first === 0x002B || first === 0x002D) {
        // If the second code point is a digit, return true.
        if (isDigit(second)) {
            return 2;
        }

        // Otherwise, if the second code point is a U+002E FULL STOP (.)
        // and the third code point is a digit, return true.
        // Otherwise, return false.
        return second === 0x002E && isDigit(third) ? 3 : 0;
    }

    // U+002E FULL STOP (.)
    if (first === 0x002E) {
        // If the second code point is a digit, return true. Otherwise, return false.
        return isDigit(second) ? 2 : 0;
    }

    // digit
    if (isDigit(first)) {
        // Return true.
        return 1;
    }

    // anything else
    // Return false.
    return 0;
}

//
// Misc
//

// detect BOM (https://en.wikipedia.org/wiki/Byte_order_mark)
function isBOM(code) {
    // UTF-16BE
    if (code === 0xFEFF) {
        return 1;
    }

    // UTF-16LE
    if (code === 0xFFFE) {
        return 1;
    }

    return 0;
}

// Fast code category
//
// https://drafts.csswg.org/css-syntax/#tokenizer-definitions
// > non-ASCII code point
// >   A code point with a value equal to or greater than U+0080 <control>
// > name-start code point
// >   A letter, a non-ASCII code point, or U+005F LOW LINE (_).
// > name code point
// >   A name-start code point, a digit, or U+002D HYPHEN-MINUS (-)
// That means only ASCII code points has a special meaning and we define a maps for 0..127 codes only
var CATEGORY = new Array(0x80);
charCodeCategory.Eof = 0x80;
charCodeCategory.WhiteSpace = 0x82;
charCodeCategory.Digit = 0x83;
charCodeCategory.NameStart = 0x84;
charCodeCategory.NonPrintable = 0x85;

for (var i$1 = 0; i$1 < CATEGORY.length; i$1++) {
    switch (true) {
        case isWhiteSpace(i$1):
            CATEGORY[i$1] = charCodeCategory.WhiteSpace;
            break;

        case isDigit(i$1):
            CATEGORY[i$1] = charCodeCategory.Digit;
            break;

        case isNameStart(i$1):
            CATEGORY[i$1] = charCodeCategory.NameStart;
            break;

        case isNonPrintable(i$1):
            CATEGORY[i$1] = charCodeCategory.NonPrintable;
            break;

        default:
            CATEGORY[i$1] = i$1 || charCodeCategory.Eof;
    }
}

function charCodeCategory(code) {
    return code < 0x80 ? CATEGORY[code] : charCodeCategory.NameStart;
}
var charCodeDefinitions = {
    isDigit: isDigit,
    isHexDigit: isHexDigit$1,
    isUppercaseLetter: isUppercaseLetter,
    isLowercaseLetter: isLowercaseLetter,
    isLetter: isLetter,
    isNonAscii: isNonAscii,
    isNameStart: isNameStart,
    isName: isName,
    isNonPrintable: isNonPrintable,
    isNewline: isNewline,
    isWhiteSpace: isWhiteSpace,
    isValidEscape: isValidEscape,
    isIdentifierStart: isIdentifierStart$1,
    isNumberStart: isNumberStart,

    isBOM: isBOM,
    charCodeCategory: charCodeCategory
};

var isDigit$1 = charCodeDefinitions.isDigit;
var isHexDigit$2 = charCodeDefinitions.isHexDigit;
var isUppercaseLetter$1 = charCodeDefinitions.isUppercaseLetter;
var isName$1 = charCodeDefinitions.isName;
var isWhiteSpace$1 = charCodeDefinitions.isWhiteSpace;
var isValidEscape$1 = charCodeDefinitions.isValidEscape;

function getCharCode(source, offset) {
    return offset < source.length ? source.charCodeAt(offset) : 0;
}

function getNewlineLength(source, offset, code) {
    if (code === 13 /* \r */ && getCharCode(source, offset + 1) === 10 /* \n */) {
        return 2;
    }

    return 1;
}

function cmpChar(testStr, offset, referenceCode) {
    var code = testStr.charCodeAt(offset);

    // code.toLowerCase() for A..Z
    if (isUppercaseLetter$1(code)) {
        code = code | 32;
    }

    return code === referenceCode;
}

function cmpStr(testStr, start, end, referenceStr) {
    if (end - start !== referenceStr.length) {
        return false;
    }

    if (start < 0 || end > testStr.length) {
        return false;
    }

    for (var i = start; i < end; i++) {
        var testCode = testStr.charCodeAt(i);
        var referenceCode = referenceStr.charCodeAt(i - start);

        // testCode.toLowerCase() for A..Z
        if (isUppercaseLetter$1(testCode)) {
            testCode = testCode | 32;
        }

        if (testCode !== referenceCode) {
            return false;
        }
    }

    return true;
}

function findWhiteSpaceStart(source, offset) {
    for (; offset >= 0; offset--) {
        if (!isWhiteSpace$1(source.charCodeAt(offset))) {
            break;
        }
    }

    return offset + 1;
}

function findWhiteSpaceEnd(source, offset) {
    for (; offset < source.length; offset++) {
        if (!isWhiteSpace$1(source.charCodeAt(offset))) {
            break;
        }
    }

    return offset;
}

function findDecimalNumberEnd(source, offset) {
    for (; offset < source.length; offset++) {
        if (!isDigit$1(source.charCodeAt(offset))) {
            break;
        }
    }

    return offset;
}

// § 4.3.7. Consume an escaped code point
function consumeEscaped(source, offset) {
    // It assumes that the U+005C REVERSE SOLIDUS (\) has already been consumed and
    // that the next input code point has already been verified to be part of a valid escape.
    offset += 2;

    // hex digit
    if (isHexDigit$2(getCharCode(source, offset - 1))) {
        // Consume as many hex digits as possible, but no more than 5.
        // Note that this means 1-6 hex digits have been consumed in total.
        for (var maxOffset = Math.min(source.length, offset + 5); offset < maxOffset; offset++) {
            if (!isHexDigit$2(getCharCode(source, offset))) {
                break;
            }
        }

        // If the next input code point is whitespace, consume it as well.
        var code = getCharCode(source, offset);
        if (isWhiteSpace$1(code)) {
            offset += getNewlineLength(source, offset, code);
        }
    }

    return offset;
}

// §4.3.11. Consume a name
// Note: This algorithm does not do the verification of the first few code points that are necessary
// to ensure the returned code points would constitute an <ident-token>. If that is the intended use,
// ensure that the stream starts with an identifier before calling this algorithm.
function consumeName(source, offset) {
    // Let result initially be an empty string.
    // Repeatedly consume the next input code point from the stream:
    for (; offset < source.length; offset++) {
        var code = source.charCodeAt(offset);

        // name code point
        if (isName$1(code)) {
            // Append the code point to result.
            continue;
        }

        // the stream starts with a valid escape
        if (isValidEscape$1(code, getCharCode(source, offset + 1))) {
            // Consume an escaped code point. Append the returned code point to result.
            offset = consumeEscaped(source, offset) - 1;
            continue;
        }

        // anything else
        // Reconsume the current input code point. Return result.
        break;
    }

    return offset;
}

// §4.3.12. Consume a number
function consumeNumber(source, offset) {
    var code = source.charCodeAt(offset);

    // 2. If the next input code point is U+002B PLUS SIGN (+) or U+002D HYPHEN-MINUS (-),
    // consume it and append it to repr.
    if (code === 0x002B || code === 0x002D) {
        code = source.charCodeAt(offset += 1);
    }

    // 3. While the next input code point is a digit, consume it and append it to repr.
    if (isDigit$1(code)) {
        offset = findDecimalNumberEnd(source, offset + 1);
        code = source.charCodeAt(offset);
    }

    // 4. If the next 2 input code points are U+002E FULL STOP (.) followed by a digit, then:
    if (code === 0x002E && isDigit$1(source.charCodeAt(offset + 1))) {
        // 4.1 Consume them.
        // 4.2 Append them to repr.
        code = source.charCodeAt(offset += 2);

        // 4.3 Set type to "number".
        // TODO

        // 4.4 While the next input code point is a digit, consume it and append it to repr.

        offset = findDecimalNumberEnd(source, offset);
    }

    // 5. If the next 2 or 3 input code points are U+0045 LATIN CAPITAL LETTER E (E)
    // or U+0065 LATIN SMALL LETTER E (e), ... , followed by a digit, then:
    if (cmpChar(source, offset, 101 /* e */)) {
        var sign = 0;
        code = source.charCodeAt(offset + 1);

        // ... optionally followed by U+002D HYPHEN-MINUS (-) or U+002B PLUS SIGN (+) ...
        if (code === 0x002D || code === 0x002B) {
            sign = 1;
            code = source.charCodeAt(offset + 2);
        }

        // ... followed by a digit
        if (isDigit$1(code)) {
            // 5.1 Consume them.
            // 5.2 Append them to repr.

            // 5.3 Set type to "number".
            // TODO

            // 5.4 While the next input code point is a digit, consume it and append it to repr.
            offset = findDecimalNumberEnd(source, offset + 1 + sign + 1);
        }
    }

    return offset;
}

// § 4.3.14. Consume the remnants of a bad url
// ... its sole use is to consume enough of the input stream to reach a recovery point
// where normal tokenizing can resume.
function consumeBadUrlRemnants(source, offset) {
    // Repeatedly consume the next input code point from the stream:
    for (; offset < source.length; offset++) {
        var code = source.charCodeAt(offset);

        // U+0029 RIGHT PARENTHESIS ())
        // EOF
        if (code === 0x0029) {
            // Return.
            offset++;
            break;
        }

        if (isValidEscape$1(code, getCharCode(source, offset + 1))) {
            // Consume an escaped code point.
            // Note: This allows an escaped right parenthesis ("\)") to be encountered
            // without ending the <bad-url-token>. This is otherwise identical to
            // the "anything else" clause.
            offset = consumeEscaped(source, offset);
        }
    }

    return offset;
}

var utils = {
    consumeEscaped: consumeEscaped,
    consumeName: consumeName,
    consumeNumber: consumeNumber,
    consumeBadUrlRemnants: consumeBadUrlRemnants,

    cmpChar: cmpChar,
    cmpStr: cmpStr,

    getNewlineLength: getNewlineLength,
    findWhiteSpaceStart: findWhiteSpaceStart,
    findWhiteSpaceEnd: findWhiteSpaceEnd
};

var TYPE$1 = _const.TYPE;
var NAME$1 = _const.NAME;


var cmpStr$1 = utils.cmpStr;

var EOF$1 = TYPE$1.EOF;
var WHITESPACE = TYPE$1.WhiteSpace;
var COMMENT = TYPE$1.Comment;

var OFFSET_MASK = 0x00FFFFFF;
var TYPE_SHIFT = 24;

var TokenStream = function() {
    this.offsetAndType = null;
    this.balance = null;

    this.reset();
};

TokenStream.prototype = {
    reset: function() {
        this.eof = false;
        this.tokenIndex = -1;
        this.tokenType = 0;
        this.tokenStart = this.firstCharOffset;
        this.tokenEnd = this.firstCharOffset;
    },

    lookupType: function(offset) {
        offset += this.tokenIndex;

        if (offset < this.tokenCount) {
            return this.offsetAndType[offset] >> TYPE_SHIFT;
        }

        return EOF$1;
    },
    lookupOffset: function(offset) {
        offset += this.tokenIndex;

        if (offset < this.tokenCount) {
            return this.offsetAndType[offset - 1] & OFFSET_MASK;
        }

        return this.source.length;
    },
    lookupValue: function(offset, referenceStr) {
        offset += this.tokenIndex;

        if (offset < this.tokenCount) {
            return cmpStr$1(
                this.source,
                this.offsetAndType[offset - 1] & OFFSET_MASK,
                this.offsetAndType[offset] & OFFSET_MASK,
                referenceStr
            );
        }

        return false;
    },
    getTokenStart: function(tokenIndex) {
        if (tokenIndex === this.tokenIndex) {
            return this.tokenStart;
        }

        if (tokenIndex > 0) {
            return tokenIndex < this.tokenCount
                ? this.offsetAndType[tokenIndex - 1] & OFFSET_MASK
                : this.offsetAndType[this.tokenCount] & OFFSET_MASK;
        }

        return this.firstCharOffset;
    },

    // TODO: -> skipUntilBalanced
    getRawLength: function(startToken, mode) {
        var cursor = startToken;
        var balanceEnd;
        var offset = this.offsetAndType[Math.max(cursor - 1, 0)] & OFFSET_MASK;
        var type;

        loop:
        for (; cursor < this.tokenCount; cursor++) {
            balanceEnd = this.balance[cursor];

            // stop scanning on balance edge that points to offset before start token
            if (balanceEnd < startToken) {
                break loop;
            }

            type = this.offsetAndType[cursor] >> TYPE_SHIFT;

            // check token is stop type
            switch (mode(type, this.source, offset)) {
                case 1:
                    break loop;

                case 2:
                    cursor++;
                    break loop;

                default:
                    offset = this.offsetAndType[cursor] & OFFSET_MASK;

                    // fast forward to the end of balanced block
                    if (this.balance[balanceEnd] === cursor) {
                        cursor = balanceEnd;
                    }
            }
        }

        return cursor - this.tokenIndex;
    },
    isBalanceEdge: function(pos) {
        return this.balance[this.tokenIndex] < pos;
    },
    isDelim: function(code, offset) {
        if (offset) {
            return (
                this.lookupType(offset) === TYPE$1.Delim &&
                this.source.charCodeAt(this.lookupOffset(offset)) === code
            );
        }

        return (
            this.tokenType === TYPE$1.Delim &&
            this.source.charCodeAt(this.tokenStart) === code
        );
    },

    getTokenValue: function() {
        return this.source.substring(this.tokenStart, this.tokenEnd);
    },
    getTokenLength: function() {
        return this.tokenEnd - this.tokenStart;
    },
    substrToCursor: function(start) {
        return this.source.substring(start, this.tokenStart);
    },

    skipWS: function() {
        for (var i = this.tokenIndex, skipTokenCount = 0; i < this.tokenCount; i++, skipTokenCount++) {
            if ((this.offsetAndType[i] >> TYPE_SHIFT) !== WHITESPACE) {
                break;
            }
        }

        if (skipTokenCount > 0) {
            this.skip(skipTokenCount);
        }
    },
    skipSC: function() {
        while (this.tokenType === WHITESPACE || this.tokenType === COMMENT) {
            this.next();
        }
    },
    skip: function(tokenCount) {
        var next = this.tokenIndex + tokenCount;

        if (next < this.tokenCount) {
            this.tokenIndex = next;
            this.tokenStart = this.offsetAndType[next - 1] & OFFSET_MASK;
            next = this.offsetAndType[next];
            this.tokenType = next >> TYPE_SHIFT;
            this.tokenEnd = next & OFFSET_MASK;
        } else {
            this.tokenIndex = this.tokenCount;
            this.next();
        }
    },
    next: function() {
        var next = this.tokenIndex + 1;

        if (next < this.tokenCount) {
            this.tokenIndex = next;
            this.tokenStart = this.tokenEnd;
            next = this.offsetAndType[next];
            this.tokenType = next >> TYPE_SHIFT;
            this.tokenEnd = next & OFFSET_MASK;
        } else {
            this.tokenIndex = this.tokenCount;
            this.eof = true;
            this.tokenType = EOF$1;
            this.tokenStart = this.tokenEnd = this.source.length;
        }
    },

    forEachToken(fn) {
        for (var i = 0, offset = this.firstCharOffset; i < this.tokenCount; i++) {
            var start = offset;
            var item = this.offsetAndType[i];
            var end = item & OFFSET_MASK;
            var type = item >> TYPE_SHIFT;

            offset = end;

            fn(type, start, end, i);
        }
    },

    dump() {
        var tokens = new Array(this.tokenCount);

        this.forEachToken((type, start, end, index) => {
            tokens[index] = {
                idx: index,
                type: NAME$1[type],
                chunk: this.source.substring(start, end),
                balance: this.balance[index]
            };
        });

        return tokens;
    }
};

var TokenStream_1 = TokenStream;

var TYPE$2 = _const.TYPE;


var isNewline$1 = charCodeDefinitions.isNewline;
var isName$2 = charCodeDefinitions.isName;
var isValidEscape$2 = charCodeDefinitions.isValidEscape;
var isNumberStart$1 = charCodeDefinitions.isNumberStart;
var isIdentifierStart$2 = charCodeDefinitions.isIdentifierStart;
var charCodeCategory$1 = charCodeDefinitions.charCodeCategory;
var isBOM$1 = charCodeDefinitions.isBOM;


var cmpStr$2 = utils.cmpStr;
var getNewlineLength$1 = utils.getNewlineLength;
var findWhiteSpaceEnd$1 = utils.findWhiteSpaceEnd;
var consumeEscaped$1 = utils.consumeEscaped;
var consumeName$1 = utils.consumeName;
var consumeNumber$1 = utils.consumeNumber;
var consumeBadUrlRemnants$1 = utils.consumeBadUrlRemnants;

var OFFSET_MASK$1 = 0x00FFFFFF;
var TYPE_SHIFT$1 = 24;

function tokenize(source, stream) {
    function getCharCode(offset) {
        return offset < sourceLength ? source.charCodeAt(offset) : 0;
    }

    // § 4.3.3. Consume a numeric token
    function consumeNumericToken() {
        // Consume a number and let number be the result.
        offset = consumeNumber$1(source, offset);

        // If the next 3 input code points would start an identifier, then:
        if (isIdentifierStart$2(getCharCode(offset), getCharCode(offset + 1), getCharCode(offset + 2))) {
            // Create a <dimension-token> with the same value and type flag as number, and a unit set initially to the empty string.
            // Consume a name. Set the <dimension-token>’s unit to the returned value.
            // Return the <dimension-token>.
            type = TYPE$2.Dimension;
            offset = consumeName$1(source, offset);
            return;
        }

        // Otherwise, if the next input code point is U+0025 PERCENTAGE SIGN (%), consume it.
        if (getCharCode(offset) === 0x0025) {
            // Create a <percentage-token> with the same value as number, and return it.
            type = TYPE$2.Percentage;
            offset++;
            return;
        }

        // Otherwise, create a <number-token> with the same value and type flag as number, and return it.
        type = TYPE$2.Number;
    }

    // § 4.3.4. Consume an ident-like token
    function consumeIdentLikeToken() {
        const nameStartOffset = offset;

        // Consume a name, and let string be the result.
        offset = consumeName$1(source, offset);

        // If string’s value is an ASCII case-insensitive match for "url",
        // and the next input code point is U+0028 LEFT PARENTHESIS ((), consume it.
        if (cmpStr$2(source, nameStartOffset, offset, 'url') && getCharCode(offset) === 0x0028) {
            // While the next two input code points are whitespace, consume the next input code point.
            offset = findWhiteSpaceEnd$1(source, offset + 1);

            // If the next one or two input code points are U+0022 QUOTATION MARK ("), U+0027 APOSTROPHE ('),
            // or whitespace followed by U+0022 QUOTATION MARK (") or U+0027 APOSTROPHE ('),
            // then create a <function-token> with its value set to string and return it.
            if (getCharCode(offset) === 0x0022 ||
                getCharCode(offset) === 0x0027) {
                type = TYPE$2.Function;
                offset = nameStartOffset + 4;
                return;
            }

            // Otherwise, consume a url token, and return it.
            consumeUrlToken();
            return;
        }

        // Otherwise, if the next input code point is U+0028 LEFT PARENTHESIS ((), consume it.
        // Create a <function-token> with its value set to string and return it.
        if (getCharCode(offset) === 0x0028) {
            type = TYPE$2.Function;
            offset++;
            return;
        }

        // Otherwise, create an <ident-token> with its value set to string and return it.
        type = TYPE$2.Ident;
    }

    // § 4.3.5. Consume a string token
    function consumeStringToken(endingCodePoint) {
        // This algorithm may be called with an ending code point, which denotes the code point
        // that ends the string. If an ending code point is not specified,
        // the current input code point is used.
        if (!endingCodePoint) {
            endingCodePoint = getCharCode(offset++);
        }

        // Initially create a <string-token> with its value set to the empty string.
        type = TYPE$2.String;

        // Repeatedly consume the next input code point from the stream:
        for (; offset < source.length; offset++) {
            var code = source.charCodeAt(offset);

            switch (charCodeCategory$1(code)) {
                // ending code point
                case endingCodePoint:
                    // Return the <string-token>.
                    offset++;
                    return;

                // EOF
                case charCodeCategory$1.Eof:
                    // This is a parse error. Return the <string-token>.
                    return;

                // newline
                case charCodeCategory$1.WhiteSpace:
                    if (isNewline$1(code)) {
                        // This is a parse error. Reconsume the current input code point,
                        // create a <bad-string-token>, and return it.
                        offset += getNewlineLength$1(source, offset, code);
                        type = TYPE$2.BadString;
                        return;
                    }
                    break;

                // U+005C REVERSE SOLIDUS (\)
                case 0x005C:
                    // If the next input code point is EOF, do nothing.
                    if (offset === source.length - 1) {
                        break;
                    }

                    var nextCode = getCharCode(offset + 1);

                    // Otherwise, if the next input code point is a newline, consume it.
                    if (isNewline$1(nextCode)) {
                        offset += getNewlineLength$1(source, offset + 1, nextCode);
                    } else if (isValidEscape$2(code, nextCode)) {
                        // Otherwise, (the stream starts with a valid escape) consume
                        // an escaped code point and append the returned code point to
                        // the <string-token>’s value.
                        offset = consumeEscaped$1(source, offset) - 1;
                    }
                    break;

                // anything else
                // Append the current input code point to the <string-token>’s value.
            }
        }
    }

    // § 4.3.6. Consume a url token
    // Note: This algorithm assumes that the initial "url(" has already been consumed.
    // This algorithm also assumes that it’s being called to consume an "unquoted" value, like url(foo).
    // A quoted value, like url("foo"), is parsed as a <function-token>. Consume an ident-like token
    // automatically handles this distinction; this algorithm shouldn’t be called directly otherwise.
    function consumeUrlToken() {
        // Initially create a <url-token> with its value set to the empty string.
        type = TYPE$2.Url;

        // Consume as much whitespace as possible.
        offset = findWhiteSpaceEnd$1(source, offset);

        // Repeatedly consume the next input code point from the stream:
        for (; offset < source.length; offset++) {
            var code = source.charCodeAt(offset);

            switch (charCodeCategory$1(code)) {
                // U+0029 RIGHT PARENTHESIS ())
                case 0x0029:
                    // Return the <url-token>.
                    offset++;
                    return;

                // EOF
                case charCodeCategory$1.Eof:
                    // This is a parse error. Return the <url-token>.
                    return;

                // whitespace
                case charCodeCategory$1.WhiteSpace:
                    // Consume as much whitespace as possible.
                    offset = findWhiteSpaceEnd$1(source, offset);

                    // If the next input code point is U+0029 RIGHT PARENTHESIS ()) or EOF,
                    // consume it and return the <url-token>
                    // (if EOF was encountered, this is a parse error);
                    if (getCharCode(offset) === 0x0029 || offset >= source.length) {
                        if (offset < source.length) {
                            offset++;
                        }
                        return;
                    }

                    // otherwise, consume the remnants of a bad url, create a <bad-url-token>,
                    // and return it.
                    offset = consumeBadUrlRemnants$1(source, offset);
                    type = TYPE$2.BadUrl;
                    return;

                // U+0022 QUOTATION MARK (")
                // U+0027 APOSTROPHE (')
                // U+0028 LEFT PARENTHESIS (()
                // non-printable code point
                case 0x0022:
                case 0x0027:
                case 0x0028:
                case charCodeCategory$1.NonPrintable:
                    // This is a parse error. Consume the remnants of a bad url,
                    // create a <bad-url-token>, and return it.
                    offset = consumeBadUrlRemnants$1(source, offset);
                    type = TYPE$2.BadUrl;
                    return;

                // U+005C REVERSE SOLIDUS (\)
                case 0x005C:
                    // If the stream starts with a valid escape, consume an escaped code point and
                    // append the returned code point to the <url-token>’s value.
                    if (isValidEscape$2(code, getCharCode(offset + 1))) {
                        offset = consumeEscaped$1(source, offset) - 1;
                        break;
                    }

                    // Otherwise, this is a parse error. Consume the remnants of a bad url,
                    // create a <bad-url-token>, and return it.
                    offset = consumeBadUrlRemnants$1(source, offset);
                    type = TYPE$2.BadUrl;
                    return;

                // anything else
                // Append the current input code point to the <url-token>’s value.
            }
        }
    }

    if (!stream) {
        stream = new TokenStream_1();
    }

    // ensure source is a string
    source = String(source || '');

    var sourceLength = source.length;
    var offsetAndType = adoptBuffer(stream.offsetAndType, sourceLength + 1); // +1 because of eof-token
    var balance = adoptBuffer(stream.balance, sourceLength + 1);
    var tokenCount = 0;
    var start = isBOM$1(getCharCode(0));
    var offset = start;
    var balanceCloseType = 0;
    var balanceStart = 0;
    var balancePrev = 0;

    // https://drafts.csswg.org/css-syntax-3/#consume-token
    // § 4.3.1. Consume a token
    while (offset < sourceLength) {
        var code = source.charCodeAt(offset);
        var type = 0;

        balance[tokenCount] = sourceLength;

        switch (charCodeCategory$1(code)) {
            // whitespace
            case charCodeCategory$1.WhiteSpace:
                // Consume as much whitespace as possible. Return a <whitespace-token>.
                type = TYPE$2.WhiteSpace;
                offset = findWhiteSpaceEnd$1(source, offset + 1);
                break;

            // U+0022 QUOTATION MARK (")
            case 0x0022:
                // Consume a string token and return it.
                consumeStringToken();
                break;

            // U+0023 NUMBER SIGN (#)
            case 0x0023:
                // If the next input code point is a name code point or the next two input code points are a valid escape, then:
                if (isName$2(getCharCode(offset + 1)) || isValidEscape$2(getCharCode(offset + 1), getCharCode(offset + 2))) {
                    // Create a <hash-token>.
                    type = TYPE$2.Hash;

                    // If the next 3 input code points would start an identifier, set the <hash-token>’s type flag to "id".
                    // if (isIdentifierStart(getCharCode(offset + 1), getCharCode(offset + 2), getCharCode(offset + 3))) {
                    //     // TODO: set id flag
                    // }

                    // Consume a name, and set the <hash-token>’s value to the returned string.
                    offset = consumeName$1(source, offset + 1);

                    // Return the <hash-token>.
                } else {
                    // Otherwise, return a <delim-token> with its value set to the current input code point.
                    type = TYPE$2.Delim;
                    offset++;
                }

                break;

            // U+0027 APOSTROPHE (')
            case 0x0027:
                // Consume a string token and return it.
                consumeStringToken();
                break;

            // U+0028 LEFT PARENTHESIS (()
            case 0x0028:
                // Return a <(-token>.
                type = TYPE$2.LeftParenthesis;
                offset++;
                break;

            // U+0029 RIGHT PARENTHESIS ())
            case 0x0029:
                // Return a <)-token>.
                type = TYPE$2.RightParenthesis;
                offset++;
                break;

            // U+002B PLUS SIGN (+)
            case 0x002B:
                // If the input stream starts with a number, ...
                if (isNumberStart$1(code, getCharCode(offset + 1), getCharCode(offset + 2))) {
                    // ... reconsume the current input code point, consume a numeric token, and return it.
                    consumeNumericToken();
                } else {
                    // Otherwise, return a <delim-token> with its value set to the current input code point.
                    type = TYPE$2.Delim;
                    offset++;
                }
                break;

            // U+002C COMMA (,)
            case 0x002C:
                // Return a <comma-token>.
                type = TYPE$2.Comma;
                offset++;
                break;

            // U+002D HYPHEN-MINUS (-)
            case 0x002D:
                // If the input stream starts with a number, reconsume the current input code point, consume a numeric token, and return it.
                if (isNumberStart$1(code, getCharCode(offset + 1), getCharCode(offset + 2))) {
                    consumeNumericToken();
                } else {
                    // Otherwise, if the next 2 input code points are U+002D HYPHEN-MINUS U+003E GREATER-THAN SIGN (->), consume them and return a <CDC-token>.
                    if (getCharCode(offset + 1) === 0x002D &&
                        getCharCode(offset + 2) === 0x003E) {
                        type = TYPE$2.CDC;
                        offset = offset + 3;
                    } else {
                        // Otherwise, if the input stream starts with an identifier, ...
                        if (isIdentifierStart$2(code, getCharCode(offset + 1), getCharCode(offset + 2))) {
                            // ... reconsume the current input code point, consume an ident-like token, and return it.
                            consumeIdentLikeToken();
                        } else {
                            // Otherwise, return a <delim-token> with its value set to the current input code point.
                            type = TYPE$2.Delim;
                            offset++;
                        }
                    }
                }
                break;

            // U+002E FULL STOP (.)
            case 0x002E:
                // If the input stream starts with a number, ...
                if (isNumberStart$1(code, getCharCode(offset + 1), getCharCode(offset + 2))) {
                    // ... reconsume the current input code point, consume a numeric token, and return it.
                    consumeNumericToken();
                } else {
                    // Otherwise, return a <delim-token> with its value set to the current input code point.
                    type = TYPE$2.Delim;
                    offset++;
                }

                break;

            // U+002F SOLIDUS (/)
            case 0x002F:
                // If the next two input code point are U+002F SOLIDUS (/) followed by a U+002A ASTERISK (*),
                if (getCharCode(offset + 1) === 0x002A) {
                    // ... consume them and all following code points up to and including the first U+002A ASTERISK (*)
                    // followed by a U+002F SOLIDUS (/), or up to an EOF code point.
                    type = TYPE$2.Comment;
                    offset = source.indexOf('*/', offset + 2) + 2;
                    if (offset === 1) {
                        offset = source.length;
                    }
                } else {
                    type = TYPE$2.Delim;
                    offset++;
                }
                break;

            // U+003A COLON (:)
            case 0x003A:
                // Return a <colon-token>.
                type = TYPE$2.Colon;
                offset++;
                break;

            // U+003B SEMICOLON (;)
            case 0x003B:
                // Return a <semicolon-token>.
                type = TYPE$2.Semicolon;
                offset++;
                break;

            // U+003C LESS-THAN SIGN (<)
            case 0x003C:
                // If the next 3 input code points are U+0021 EXCLAMATION MARK U+002D HYPHEN-MINUS U+002D HYPHEN-MINUS (!--), ...
                if (getCharCode(offset + 1) === 0x0021 &&
                    getCharCode(offset + 2) === 0x002D &&
                    getCharCode(offset + 3) === 0x002D) {
                    // ... consume them and return a <CDO-token>.
                    type = TYPE$2.CDO;
                    offset = offset + 4;
                } else {
                    // Otherwise, return a <delim-token> with its value set to the current input code point.
                    type = TYPE$2.Delim;
                    offset++;
                }

                break;

            // U+0040 COMMERCIAL AT (@)
            case 0x0040:
                // If the next 3 input code points would start an identifier, ...
                if (isIdentifierStart$2(getCharCode(offset + 1), getCharCode(offset + 2), getCharCode(offset + 3))) {
                    // ... consume a name, create an <at-keyword-token> with its value set to the returned value, and return it.
                    type = TYPE$2.AtKeyword;
                    offset = consumeName$1(source, offset + 1);
                } else {
                    // Otherwise, return a <delim-token> with its value set to the current input code point.
                    type = TYPE$2.Delim;
                    offset++;
                }

                break;

            // U+005B LEFT SQUARE BRACKET ([)
            case 0x005B:
                // Return a <[-token>.
                type = TYPE$2.LeftSquareBracket;
                offset++;
                break;

            // U+005C REVERSE SOLIDUS (\)
            case 0x005C:
                // If the input stream starts with a valid escape, ...
                if (isValidEscape$2(code, getCharCode(offset + 1))) {
                    // ... reconsume the current input code point, consume an ident-like token, and return it.
                    consumeIdentLikeToken();
                } else {
                    // Otherwise, this is a parse error. Return a <delim-token> with its value set to the current input code point.
                    type = TYPE$2.Delim;
                    offset++;
                }
                break;

            // U+005D RIGHT SQUARE BRACKET (])
            case 0x005D:
                // Return a <]-token>.
                type = TYPE$2.RightSquareBracket;
                offset++;
                break;

            // U+007B LEFT CURLY BRACKET ({)
            case 0x007B:
                // Return a <{-token>.
                type = TYPE$2.LeftCurlyBracket;
                offset++;
                break;

            // U+007D RIGHT CURLY BRACKET (})
            case 0x007D:
                // Return a <}-token>.
                type = TYPE$2.RightCurlyBracket;
                offset++;
                break;

            // digit
            case charCodeCategory$1.Digit:
                // Reconsume the current input code point, consume a numeric token, and return it.
                consumeNumericToken();
                break;

            // name-start code point
            case charCodeCategory$1.NameStart:
                // Reconsume the current input code point, consume an ident-like token, and return it.
                consumeIdentLikeToken();
                break;

            // EOF
            case charCodeCategory$1.Eof:
                // Return an <EOF-token>.
                break;

            // anything else
            default:
                // Return a <delim-token> with its value set to the current input code point.
                type = TYPE$2.Delim;
                offset++;
        }

        switch (type) {
            case balanceCloseType:
                balancePrev = balanceStart & OFFSET_MASK$1;
                balanceStart = balance[balancePrev];
                balanceCloseType = balanceStart >> TYPE_SHIFT$1;
                balance[tokenCount] = balancePrev;
                balance[balancePrev++] = tokenCount;
                for (; balancePrev < tokenCount; balancePrev++) {
                    if (balance[balancePrev] === sourceLength) {
                        balance[balancePrev] = tokenCount;
                    }
                }
                break;

            case TYPE$2.LeftParenthesis:
            case TYPE$2.Function:
                balance[tokenCount] = balanceStart;
                balanceCloseType = TYPE$2.RightParenthesis;
                balanceStart = (balanceCloseType << TYPE_SHIFT$1) | tokenCount;
                break;

            case TYPE$2.LeftSquareBracket:
                balance[tokenCount] = balanceStart;
                balanceCloseType = TYPE$2.RightSquareBracket;
                balanceStart = (balanceCloseType << TYPE_SHIFT$1) | tokenCount;
                break;

            case TYPE$2.LeftCurlyBracket:
                balance[tokenCount] = balanceStart;
                balanceCloseType = TYPE$2.RightCurlyBracket;
                balanceStart = (balanceCloseType << TYPE_SHIFT$1) | tokenCount;
                break;
        }

        offsetAndType[tokenCount++] = (type << TYPE_SHIFT$1) | offset;
    }

    // finalize buffers
    offsetAndType[tokenCount] = (TYPE$2.EOF << TYPE_SHIFT$1) | offset; // <EOF-token>
    balance[tokenCount] = sourceLength;
    balance[sourceLength] = sourceLength; // prevents false positive balance match with any token
    while (balanceStart !== 0) {
        balancePrev = balanceStart & OFFSET_MASK$1;
        balanceStart = balance[balancePrev];
        balance[balancePrev] = sourceLength;
    }

    // update stream
    stream.source = source;
    stream.firstCharOffset = start;
    stream.offsetAndType = offsetAndType;
    stream.tokenCount = tokenCount;
    stream.balance = balance;
    stream.reset();
    stream.next();

    return stream;
}

// extend tokenizer with constants
Object.keys(_const).forEach(function(key) {
    tokenize[key] = _const[key];
});

// extend tokenizer with static methods from utils
Object.keys(charCodeDefinitions).forEach(function(key) {
    tokenize[key] = charCodeDefinitions[key];
});
Object.keys(utils).forEach(function(key) {
    tokenize[key] = utils[key];
});

var tokenizer = tokenize;

var isBOM$2 = tokenizer.isBOM;

var N = 10;
var F = 12;
var R = 13;

function computeLinesAndColumns(host, source) {
    var sourceLength = source.length;
    var lines = adoptBuffer(host.lines, sourceLength); // +1
    var line = host.startLine;
    var columns = adoptBuffer(host.columns, sourceLength);
    var column = host.startColumn;
    var startOffset = source.length > 0 ? isBOM$2(source.charCodeAt(0)) : 0;

    for (var i = startOffset; i < sourceLength; i++) { // -1
        var code = source.charCodeAt(i);

        lines[i] = line;
        columns[i] = column++;

        if (code === N || code === R || code === F) {
            if (code === R && i + 1 < sourceLength && source.charCodeAt(i + 1) === N) {
                i++;
                lines[i] = line;
                columns[i] = column;
            }

            line++;
            column = 1;
        }
    }

    lines[i] = line;
    columns[i] = column;

    host.lines = lines;
    host.columns = columns;
}

var OffsetToLocation = function() {
    this.lines = null;
    this.columns = null;
    this.linesAndColumnsComputed = false;
};

OffsetToLocation.prototype = {
    setSource: function(source, startOffset, startLine, startColumn) {
        this.source = source;
        this.startOffset = typeof startOffset === 'undefined' ? 0 : startOffset;
        this.startLine = typeof startLine === 'undefined' ? 1 : startLine;
        this.startColumn = typeof startColumn === 'undefined' ? 1 : startColumn;
        this.linesAndColumnsComputed = false;
    },

    ensureLinesAndColumnsComputed: function() {
        if (!this.linesAndColumnsComputed) {
            computeLinesAndColumns(this, this.source);
            this.linesAndColumnsComputed = true;
        }
    },
    getLocation: function(offset, filename) {
        this.ensureLinesAndColumnsComputed();

        return {
            source: filename,
            offset: this.startOffset + offset,
            line: this.lines[offset],
            column: this.columns[offset]
        };
    },
    getLocationRange: function(start, end, filename) {
        this.ensureLinesAndColumnsComputed();

        return {
            source: filename,
            start: {
                offset: this.startOffset + start,
                line: this.lines[start],
                column: this.columns[start]
            },
            end: {
                offset: this.startOffset + end,
                line: this.lines[end],
                column: this.columns[end]
            }
        };
    }
};

var OffsetToLocation_1 = OffsetToLocation;

var createCustomError = function createCustomError(name, message) {
    // use Object.create(), because some VMs prevent setting line/column otherwise
    // (iOS Safari 10 even throws an exception)
    var error = Object.create(SyntaxError.prototype);
    var errorStack = new Error();

    error.name = name;
    error.message = message;

    Object.defineProperty(error, 'stack', {
        get: function() {
            return (errorStack.stack || '').replace(/^(.+\n){1,3}/, name + ': ' + message + '\n');
        }
    });

    return error;
};

var MAX_LINE_LENGTH = 100;
var OFFSET_CORRECTION = 60;
var TAB_REPLACEMENT = '    ';

function sourceFragment(error, extraLines) {
    function processLines(start, end) {
        return lines.slice(start, end).map(function(line, idx) {
            var num = String(start + idx + 1);

            while (num.length < maxNumLength) {
                num = ' ' + num;
            }

            return num + ' |' + line;
        }).join('\n');
    }

    var lines = error.source.split(/\r\n?|\n|\f/);
    var line = error.line;
    var column = error.column;
    var startLine = Math.max(1, line - extraLines) - 1;
    var endLine = Math.min(line + extraLines, lines.length + 1);
    var maxNumLength = Math.max(4, String(endLine).length) + 1;
    var cutLeft = 0;

    // column correction according to replaced tab before column
    column += (TAB_REPLACEMENT.length - 1) * (lines[line - 1].substr(0, column - 1).match(/\t/g) || []).length;

    if (column > MAX_LINE_LENGTH) {
        cutLeft = column - OFFSET_CORRECTION + 3;
        column = OFFSET_CORRECTION - 2;
    }

    for (var i = startLine; i <= endLine; i++) {
        if (i >= 0 && i < lines.length) {
            lines[i] = lines[i].replace(/\t/g, TAB_REPLACEMENT);
            lines[i] =
                (cutLeft > 0 && lines[i].length > cutLeft ? '\u2026' : '') +
                lines[i].substr(cutLeft, MAX_LINE_LENGTH - 2) +
                (lines[i].length > cutLeft + MAX_LINE_LENGTH - 1 ? '\u2026' : '');
        }
    }

    return [
        processLines(startLine, line),
        new Array(column + maxNumLength + 2).join('-') + '^',
        processLines(line, endLine)
    ].filter(Boolean).join('\n');
}

var SyntaxError$1 = function(message, source, offset, line, column) {
    var error = createCustomError('SyntaxError', message);

    error.source = source;
    error.offset = offset;
    error.line = line;
    error.column = column;

    error.sourceFragment = function(extraLines) {
        return sourceFragment(error, isNaN(extraLines) ? 0 : extraLines);
    };
    Object.defineProperty(error, 'formattedMessage', {
        get: function() {
            return (
                'Parse error: ' + error.message + '\n' +
                sourceFragment(error, 2)
            );
        }
    });

    // for backward capability
    error.parseError = {
        offset: offset,
        line: line,
        column: column
    };

    return error;
};

var _SyntaxError = SyntaxError$1;

//
//                              list
//                            ┌──────┐
//             ┌──────────────┼─head │
//             │              │ tail─┼──────────────┐
//             │              └──────┘              │
//             ▼                                    ▼
//            item        item        item        item
//          ┌──────┐    ┌──────┐    ┌──────┐    ┌──────┐
//  null ◀──┼─prev │◀───┼─prev │◀───┼─prev │◀───┼─prev │
//          │ next─┼───▶│ next─┼───▶│ next─┼───▶│ next─┼──▶ null
//          ├──────┤    ├──────┤    ├──────┤    ├──────┤
//          │ data │    │ data │    │ data │    │ data │
//          └──────┘    └──────┘    └──────┘    └──────┘
//

function createItem(data) {
    return {
        prev: null,
        next: null,
        data: data
    };
}

function allocateCursor(node, prev, next) {
    var cursor;

    if (cursors !== null) {
        cursor = cursors;
        cursors = cursors.cursor;
        cursor.prev = prev;
        cursor.next = next;
        cursor.cursor = node.cursor;
    } else {
        cursor = {
            prev: prev,
            next: next,
            cursor: node.cursor
        };
    }

    node.cursor = cursor;

    return cursor;
}

function releaseCursor(node) {
    var cursor = node.cursor;

    node.cursor = cursor.cursor;
    cursor.prev = null;
    cursor.next = null;
    cursor.cursor = cursors;
    cursors = cursor;
}

var cursors = null;
var List = function() {
    this.cursor = null;
    this.head = null;
    this.tail = null;
};

List.createItem = createItem;
List.prototype.createItem = createItem;

List.prototype.updateCursors = function(prevOld, prevNew, nextOld, nextNew) {
    var cursor = this.cursor;

    while (cursor !== null) {
        if (cursor.prev === prevOld) {
            cursor.prev = prevNew;
        }

        if (cursor.next === nextOld) {
            cursor.next = nextNew;
        }

        cursor = cursor.cursor;
    }
};

List.prototype.getSize = function() {
    var size = 0;
    var cursor = this.head;

    while (cursor) {
        size++;
        cursor = cursor.next;
    }

    return size;
};

List.prototype.fromArray = function(array) {
    var cursor = null;

    this.head = null;

    for (var i = 0; i < array.length; i++) {
        var item = createItem(array[i]);

        if (cursor !== null) {
            cursor.next = item;
        } else {
            this.head = item;
        }

        item.prev = cursor;
        cursor = item;
    }

    this.tail = cursor;

    return this;
};

List.prototype.toArray = function() {
    var cursor = this.head;
    var result = [];

    while (cursor) {
        result.push(cursor.data);
        cursor = cursor.next;
    }

    return result;
};

List.prototype.toJSON = List.prototype.toArray;

List.prototype.isEmpty = function() {
    return this.head === null;
};

List.prototype.first = function() {
    return this.head && this.head.data;
};

List.prototype.last = function() {
    return this.tail && this.tail.data;
};

List.prototype.each = function(fn, context) {
    var item;

    if (context === undefined) {
        context = this;
    }

    // push cursor
    var cursor = allocateCursor(this, null, this.head);

    while (cursor.next !== null) {
        item = cursor.next;
        cursor.next = item.next;

        fn.call(context, item.data, item, this);
    }

    // pop cursor
    releaseCursor(this);
};

List.prototype.forEach = List.prototype.each;

List.prototype.eachRight = function(fn, context) {
    var item;

    if (context === undefined) {
        context = this;
    }

    // push cursor
    var cursor = allocateCursor(this, this.tail, null);

    while (cursor.prev !== null) {
        item = cursor.prev;
        cursor.prev = item.prev;

        fn.call(context, item.data, item, this);
    }

    // pop cursor
    releaseCursor(this);
};

List.prototype.forEachRight = List.prototype.eachRight;

List.prototype.reduce = function(fn, initialValue, context) {
    var item;

    if (context === undefined) {
        context = this;
    }

    // push cursor
    var cursor = allocateCursor(this, null, this.head);
    var acc = initialValue;

    while (cursor.next !== null) {
        item = cursor.next;
        cursor.next = item.next;

        acc = fn.call(context, acc, item.data, item, this);
    }

    // pop cursor
    releaseCursor(this);

    return acc;
};

List.prototype.reduceRight = function(fn, initialValue, context) {
    var item;

    if (context === undefined) {
        context = this;
    }

    // push cursor
    var cursor = allocateCursor(this, this.tail, null);
    var acc = initialValue;

    while (cursor.prev !== null) {
        item = cursor.prev;
        cursor.prev = item.prev;

        acc = fn.call(context, acc, item.data, item, this);
    }

    // pop cursor
    releaseCursor(this);

    return acc;
};

List.prototype.nextUntil = function(start, fn, context) {
    if (start === null) {
        return;
    }

    var item;

    if (context === undefined) {
        context = this;
    }

    // push cursor
    var cursor = allocateCursor(this, null, start);

    while (cursor.next !== null) {
        item = cursor.next;
        cursor.next = item.next;

        if (fn.call(context, item.data, item, this)) {
            break;
        }
    }

    // pop cursor
    releaseCursor(this);
};

List.prototype.prevUntil = function(start, fn, context) {
    if (start === null) {
        return;
    }

    var item;

    if (context === undefined) {
        context = this;
    }

    // push cursor
    var cursor = allocateCursor(this, start, null);

    while (cursor.prev !== null) {
        item = cursor.prev;
        cursor.prev = item.prev;

        if (fn.call(context, item.data, item, this)) {
            break;
        }
    }

    // pop cursor
    releaseCursor(this);
};

List.prototype.some = function(fn, context) {
    var cursor = this.head;

    if (context === undefined) {
        context = this;
    }

    while (cursor !== null) {
        if (fn.call(context, cursor.data, cursor, this)) {
            return true;
        }

        cursor = cursor.next;
    }

    return false;
};

List.prototype.map = function(fn, context) {
    var result = new List();
    var cursor = this.head;

    if (context === undefined) {
        context = this;
    }

    while (cursor !== null) {
        result.appendData(fn.call(context, cursor.data, cursor, this));
        cursor = cursor.next;
    }

    return result;
};

List.prototype.filter = function(fn, context) {
    var result = new List();
    var cursor = this.head;

    if (context === undefined) {
        context = this;
    }

    while (cursor !== null) {
        if (fn.call(context, cursor.data, cursor, this)) {
            result.appendData(cursor.data);
        }
        cursor = cursor.next;
    }

    return result;
};

List.prototype.clear = function() {
    this.head = null;
    this.tail = null;
};

List.prototype.copy = function() {
    var result = new List();
    var cursor = this.head;

    while (cursor !== null) {
        result.insert(createItem(cursor.data));
        cursor = cursor.next;
    }

    return result;
};

List.prototype.prepend = function(item) {
    //      head
    //    ^
    // item
    this.updateCursors(null, item, this.head, item);

    // insert to the beginning of the list
    if (this.head !== null) {
        // new item <- first item
        this.head.prev = item;

        // new item -> first item
        item.next = this.head;
    } else {
        // if list has no head, then it also has no tail
        // in this case tail points to the new item
        this.tail = item;
    }

    // head always points to new item
    this.head = item;

    return this;
};

List.prototype.prependData = function(data) {
    return this.prepend(createItem(data));
};

List.prototype.append = function(item) {
    return this.insert(item);
};

List.prototype.appendData = function(data) {
    return this.insert(createItem(data));
};

List.prototype.insert = function(item, before) {
    if (before !== undefined && before !== null) {
        // prev   before
        //      ^
        //     item
        this.updateCursors(before.prev, item, before, item);

        if (before.prev === null) {
            // insert to the beginning of list
            if (this.head !== before) {
                throw new Error('before doesn\'t belong to list');
            }

            // since head points to before therefore list doesn't empty
            // no need to check tail
            this.head = item;
            before.prev = item;
            item.next = before;

            this.updateCursors(null, item);
        } else {

            // insert between two items
            before.prev.next = item;
            item.prev = before.prev;

            before.prev = item;
            item.next = before;
        }
    } else {
        // tail
        //      ^
        //      item
        this.updateCursors(this.tail, item, null, item);

        // insert to the ending of the list
        if (this.tail !== null) {
            // last item -> new item
            this.tail.next = item;

            // last item <- new item
            item.prev = this.tail;
        } else {
            // if list has no tail, then it also has no head
            // in this case head points to new item
            this.head = item;
        }

        // tail always points to new item
        this.tail = item;
    }

    return this;
};

List.prototype.insertData = function(data, before) {
    return this.insert(createItem(data), before);
};

List.prototype.remove = function(item) {
    //      item
    //       ^
    // prev     next
    this.updateCursors(item, item.prev, item, item.next);

    if (item.prev !== null) {
        item.prev.next = item.next;
    } else {
        if (this.head !== item) {
            throw new Error('item doesn\'t belong to list');
        }

        this.head = item.next;
    }

    if (item.next !== null) {
        item.next.prev = item.prev;
    } else {
        if (this.tail !== item) {
            throw new Error('item doesn\'t belong to list');
        }

        this.tail = item.prev;
    }

    item.prev = null;
    item.next = null;

    return item;
};

List.prototype.push = function(data) {
    this.insert(createItem(data));
};

List.prototype.pop = function() {
    if (this.tail !== null) {
        return this.remove(this.tail);
    }
};

List.prototype.unshift = function(data) {
    this.prepend(createItem(data));
};

List.prototype.shift = function() {
    if (this.head !== null) {
        return this.remove(this.head);
    }
};

List.prototype.prependList = function(list) {
    return this.insertList(list, this.head);
};

List.prototype.appendList = function(list) {
    return this.insertList(list);
};

List.prototype.insertList = function(list, before) {
    // ignore empty lists
    if (list.head === null) {
        return this;
    }

    if (before !== undefined && before !== null) {
        this.updateCursors(before.prev, list.tail, before, list.head);

        // insert in the middle of dist list
        if (before.prev !== null) {
            // before.prev <-> list.head
            before.prev.next = list.head;
            list.head.prev = before.prev;
        } else {
            this.head = list.head;
        }

        before.prev = list.tail;
        list.tail.next = before;
    } else {
        this.updateCursors(this.tail, list.tail, null, list.head);

        // insert to end of the list
        if (this.tail !== null) {
            // if destination list has a tail, then it also has a head,
            // but head doesn't change

            // dest tail -> source head
            this.tail.next = list.head;

            // dest tail <- source head
            list.head.prev = this.tail;
        } else {
            // if list has no a tail, then it also has no a head
            // in this case points head to new item
            this.head = list.head;
        }

        // tail always start point to new item
        this.tail = list.tail;
    }

    list.head = null;
    list.tail = null;

    return this;
};

List.prototype.replace = function(oldItem, newItemOrList) {
    if ('head' in newItemOrList) {
        this.insertList(newItemOrList, oldItem);
    } else {
        this.insert(newItemOrList, oldItem);
    }

    this.remove(oldItem);
};

var List_1 = List;

var TYPE$3 = tokenizer.TYPE;
var WHITESPACE$1 = TYPE$3.WhiteSpace;
var COMMENT$1 = TYPE$3.Comment;

var sequence = function readSequence(recognizer) {
    var children = this.createList();
    var child = null;
    var context = {
        recognizer: recognizer,
        space: null,
        ignoreWS: false,
        ignoreWSAfter: false
    };

    this.scanner.skipSC();

    while (!this.scanner.eof) {
        switch (this.scanner.tokenType) {
            case COMMENT$1:
                this.scanner.next();
                continue;

            case WHITESPACE$1:
                if (context.ignoreWS) {
                    this.scanner.next();
                } else {
                    context.space = this.WhiteSpace();
                }
                continue;
        }

        child = recognizer.getNode.call(this, context);

        if (child === undefined) {
            break;
        }

        if (context.space !== null) {
            children.push(context.space);
            context.space = null;
        }

        children.push(child);

        if (context.ignoreWSAfter) {
            context.ignoreWSAfter = false;
            context.ignoreWS = true;
        } else {
            context.ignoreWS = false;
        }
    }

    return children;
};

var { findWhiteSpaceStart: findWhiteSpaceStart$1, cmpStr: cmpStr$3 } = utils;

var noop = function() {};

var TYPE$4 = _const.TYPE;
var NAME$2 = _const.NAME;
var WHITESPACE$2 = TYPE$4.WhiteSpace;
var COMMENT$2 = TYPE$4.Comment;
var IDENT = TYPE$4.Ident;
var FUNCTION = TYPE$4.Function;
var URL$1 = TYPE$4.Url;
var HASH = TYPE$4.Hash;
var PERCENTAGE = TYPE$4.Percentage;
var NUMBER = TYPE$4.Number;
var NUMBERSIGN = 0x0023; // U+0023 NUMBER SIGN (#)
var NULL = 0;

function createParseContext(name) {
    return function() {
        return this[name]();
    };
}

function processConfig(config) {
    var parserConfig = {
        context: {},
        scope: {},
        atrule: {},
        pseudo: {}
    };

    if (config.parseContext) {
        for (var name in config.parseContext) {
            switch (typeof config.parseContext[name]) {
                case 'function':
                    parserConfig.context[name] = config.parseContext[name];
                    break;

                case 'string':
                    parserConfig.context[name] = createParseContext(config.parseContext[name]);
                    break;
            }
        }
    }

    if (config.scope) {
        for (var name in config.scope) {
            parserConfig.scope[name] = config.scope[name];
        }
    }

    if (config.atrule) {
        for (var name in config.atrule) {
            var atrule = config.atrule[name];

            if (atrule.parse) {
                parserConfig.atrule[name] = atrule.parse;
            }
        }
    }

    if (config.pseudo) {
        for (var name in config.pseudo) {
            var pseudo = config.pseudo[name];

            if (pseudo.parse) {
                parserConfig.pseudo[name] = pseudo.parse;
            }
        }
    }

    if (config.node) {
        for (var name in config.node) {
            parserConfig[name] = config.node[name].parse;
        }
    }

    return parserConfig;
}

var create = function createParser(config) {
    var parser = {
        scanner: new TokenStream_1(),
        locationMap: new OffsetToLocation_1(),

        filename: '<unknown>',
        needPositions: false,
        onParseError: noop,
        onParseErrorThrow: false,
        parseAtrulePrelude: true,
        parseRulePrelude: true,
        parseValue: true,
        parseCustomProperty: false,

        readSequence: sequence,

        createList: function() {
            return new List_1();
        },
        createSingleNodeList: function(node) {
            return new List_1().appendData(node);
        },
        getFirstListNode: function(list) {
            return list && list.first();
        },
        getLastListNode: function(list) {
            return list.last();
        },

        parseWithFallback: function(consumer, fallback) {
            var startToken = this.scanner.tokenIndex;

            try {
                return consumer.call(this);
            } catch (e) {
                if (this.onParseErrorThrow) {
                    throw e;
                }

                var fallbackNode = fallback.call(this, startToken);

                this.onParseErrorThrow = true;
                this.onParseError(e, fallbackNode);
                this.onParseErrorThrow = false;

                return fallbackNode;
            }
        },

        lookupNonWSType: function(offset) {
            do {
                var type = this.scanner.lookupType(offset++);
                if (type !== WHITESPACE$2) {
                    return type;
                }
            } while (type !== NULL);

            return NULL;
        },

        eat: function(tokenType) {
            if (this.scanner.tokenType !== tokenType) {
                var offset = this.scanner.tokenStart;
                var message = NAME$2[tokenType] + ' is expected';

                // tweak message and offset
                switch (tokenType) {
                    case IDENT:
                        // when identifier is expected but there is a function or url
                        if (this.scanner.tokenType === FUNCTION || this.scanner.tokenType === URL$1) {
                            offset = this.scanner.tokenEnd - 1;
                            message = 'Identifier is expected but function found';
                        } else {
                            message = 'Identifier is expected';
                        }
                        break;

                    case HASH:
                        if (this.scanner.isDelim(NUMBERSIGN)) {
                            this.scanner.next();
                            offset++;
                            message = 'Name is expected';
                        }
                        break;

                    case PERCENTAGE:
                        if (this.scanner.tokenType === NUMBER) {
                            offset = this.scanner.tokenEnd;
                            message = 'Percent sign is expected';
                        }
                        break;

                    default:
                        // when test type is part of another token show error for current position + 1
                        // e.g. eat(HYPHENMINUS) will fail on "-foo", but pointing on "-" is odd
                        if (this.scanner.source.charCodeAt(this.scanner.tokenStart) === tokenType) {
                            offset = offset + 1;
                        }
                }

                this.error(message, offset);
            }

            this.scanner.next();
        },

        consume: function(tokenType) {
            var value = this.scanner.getTokenValue();

            this.eat(tokenType);

            return value;
        },
        consumeFunctionName: function() {
            var name = this.scanner.source.substring(this.scanner.tokenStart, this.scanner.tokenEnd - 1);

            this.eat(FUNCTION);

            return name;
        },

        getLocation: function(start, end) {
            if (this.needPositions) {
                return this.locationMap.getLocationRange(
                    start,
                    end,
                    this.filename
                );
            }

            return null;
        },
        getLocationFromList: function(list) {
            if (this.needPositions) {
                var head = this.getFirstListNode(list);
                var tail = this.getLastListNode(list);
                return this.locationMap.getLocationRange(
                    head !== null ? head.loc.start.offset - this.locationMap.startOffset : this.scanner.tokenStart,
                    tail !== null ? tail.loc.end.offset - this.locationMap.startOffset : this.scanner.tokenStart,
                    this.filename
                );
            }

            return null;
        },

        error: function(message, offset) {
            var location = typeof offset !== 'undefined' && offset < this.scanner.source.length
                ? this.locationMap.getLocation(offset)
                : this.scanner.eof
                    ? this.locationMap.getLocation(findWhiteSpaceStart$1(this.scanner.source, this.scanner.source.length - 1))
                    : this.locationMap.getLocation(this.scanner.tokenStart);

            throw new _SyntaxError(
                message || 'Unexpected input',
                this.scanner.source,
                location.offset,
                location.line,
                location.column
            );
        }
    };

    config = processConfig(config || {});
    for (var key in config) {
        parser[key] = config[key];
    }

    return function(source, options) {
        options = options || {};

        var context = options.context || 'default';
        var onComment = options.onComment;
        var ast;

        tokenizer(source, parser.scanner);
        parser.locationMap.setSource(
            source,
            options.offset,
            options.line,
            options.column
        );

        parser.filename = options.filename || '<unknown>';
        parser.needPositions = Boolean(options.positions);
        parser.onParseError = typeof options.onParseError === 'function' ? options.onParseError : noop;
        parser.onParseErrorThrow = false;
        parser.parseAtrulePrelude = 'parseAtrulePrelude' in options ? Boolean(options.parseAtrulePrelude) : true;
        parser.parseRulePrelude = 'parseRulePrelude' in options ? Boolean(options.parseRulePrelude) : true;
        parser.parseValue = 'parseValue' in options ? Boolean(options.parseValue) : true;
        parser.parseCustomProperty = 'parseCustomProperty' in options ? Boolean(options.parseCustomProperty) : false;

        if (!parser.context.hasOwnProperty(context)) {
            throw new Error('Unknown context `' + context + '`');
        }

        if (typeof onComment === 'function') {
            parser.scanner.forEachToken((type, start, end) => {
                if (type === COMMENT$2) {
                    const loc = parser.getLocation(start, end);
                    const value = cmpStr$3(source, end - 2, end, '*/')
                        ? source.slice(start + 2, end - 2)
                        : source.slice(start + 2, end);

                    onComment(value, loc);
                }
            });
        }

        ast = parser.context[context].call(parser, options);

        if (!parser.scanner.eof) {
            parser.error();
        }

        return ast;
    };
};

var cmpChar$1 = tokenizer.cmpChar;
var cmpStr$4 = tokenizer.cmpStr;
var TYPE$5 = tokenizer.TYPE;

var IDENT$1 = TYPE$5.Ident;
var STRING = TYPE$5.String;
var NUMBER$1 = TYPE$5.Number;
var FUNCTION$1 = TYPE$5.Function;
var URL$2 = TYPE$5.Url;
var HASH$1 = TYPE$5.Hash;
var DIMENSION = TYPE$5.Dimension;
var PERCENTAGE$1 = TYPE$5.Percentage;
var LEFTPARENTHESIS = TYPE$5.LeftParenthesis;
var LEFTSQUAREBRACKET = TYPE$5.LeftSquareBracket;
var COMMA = TYPE$5.Comma;
var DELIM = TYPE$5.Delim;
var NUMBERSIGN$1 = 0x0023;  // U+0023 NUMBER SIGN (#)
var ASTERISK = 0x002A;    // U+002A ASTERISK (*)
var PLUSSIGN = 0x002B;    // U+002B PLUS SIGN (+)
var HYPHENMINUS = 0x002D; // U+002D HYPHEN-MINUS (-)
var SOLIDUS = 0x002F;     // U+002F SOLIDUS (/)
var U = 0x0075;           // U+0075 LATIN SMALL LETTER U (u)

var _default = function defaultRecognizer(context) {
    switch (this.scanner.tokenType) {
        case HASH$1:
            return this.Hash();

        case COMMA:
            context.space = null;
            context.ignoreWSAfter = true;
            return this.Operator();

        case LEFTPARENTHESIS:
            return this.Parentheses(this.readSequence, context.recognizer);

        case LEFTSQUAREBRACKET:
            return this.Brackets(this.readSequence, context.recognizer);

        case STRING:
            return this.String();

        case DIMENSION:
            return this.Dimension();

        case PERCENTAGE$1:
            return this.Percentage();

        case NUMBER$1:
            return this.Number();

        case FUNCTION$1:
            return cmpStr$4(this.scanner.source, this.scanner.tokenStart, this.scanner.tokenEnd, 'url(')
                ? this.Url()
                : this.Function(this.readSequence, context.recognizer);

        case URL$2:
            return this.Url();

        case IDENT$1:
            // check for unicode range, it should start with u+ or U+
            if (cmpChar$1(this.scanner.source, this.scanner.tokenStart, U) &&
                cmpChar$1(this.scanner.source, this.scanner.tokenStart + 1, PLUSSIGN)) {
                return this.UnicodeRange();
            } else {
                return this.Identifier();
            }

        case DELIM:
            var code = this.scanner.source.charCodeAt(this.scanner.tokenStart);

            if (code === SOLIDUS ||
                code === ASTERISK ||
                code === PLUSSIGN ||
                code === HYPHENMINUS) {
                return this.Operator(); // TODO: replace with Delim
            }

            // TODO: produce a node with Delim node type

            if (code === NUMBERSIGN$1) {
                this.error('Hex or identifier is expected', this.scanner.tokenStart + 1);
            }

            break;
    }
};

var atrulePrelude = {
    getNode: _default
};

var TYPE$6 = tokenizer.TYPE;

var DELIM$1 = TYPE$6.Delim;
var IDENT$2 = TYPE$6.Ident;
var DIMENSION$1 = TYPE$6.Dimension;
var PERCENTAGE$2 = TYPE$6.Percentage;
var NUMBER$2 = TYPE$6.Number;
var HASH$2 = TYPE$6.Hash;
var COLON = TYPE$6.Colon;
var LEFTSQUAREBRACKET$1 = TYPE$6.LeftSquareBracket;
var NUMBERSIGN$2 = 0x0023;      // U+0023 NUMBER SIGN (#)
var ASTERISK$1 = 0x002A;        // U+002A ASTERISK (*)
var PLUSSIGN$1 = 0x002B;        // U+002B PLUS SIGN (+)
var SOLIDUS$1 = 0x002F;         // U+002F SOLIDUS (/)
var FULLSTOP = 0x002E;        // U+002E FULL STOP (.)
var GREATERTHANSIGN = 0x003E; // U+003E GREATER-THAN SIGN (>)
var VERTICALLINE = 0x007C;    // U+007C VERTICAL LINE (|)
var TILDE = 0x007E;           // U+007E TILDE (~)

function getNode(context) {
    switch (this.scanner.tokenType) {
        case LEFTSQUAREBRACKET$1:
            return this.AttributeSelector();

        case HASH$2:
            return this.IdSelector();

        case COLON:
            if (this.scanner.lookupType(1) === COLON) {
                return this.PseudoElementSelector();
            } else {
                return this.PseudoClassSelector();
            }

        case IDENT$2:
            return this.TypeSelector();

        case NUMBER$2:
        case PERCENTAGE$2:
            return this.Percentage();

        case DIMENSION$1:
            // throws when .123ident
            if (this.scanner.source.charCodeAt(this.scanner.tokenStart) === FULLSTOP) {
                this.error('Identifier is expected', this.scanner.tokenStart + 1);
            }
            break;

        case DELIM$1:
            var code = this.scanner.source.charCodeAt(this.scanner.tokenStart);

            switch (code) {
                case PLUSSIGN$1:
                case GREATERTHANSIGN:
                case TILDE:
                    context.space = null;
                    context.ignoreWSAfter = true;
                    return this.Combinator();

                case SOLIDUS$1:  // /deep/
                    return this.Combinator();

                case FULLSTOP:
                    return this.ClassSelector();

                case ASTERISK$1:
                case VERTICALLINE:
                    return this.TypeSelector();

                case NUMBERSIGN$2:
                    return this.IdSelector();
            }

            break;
    }
}
var selector = {
    getNode: getNode
};

// legacy IE function
// expression( <any-value> )
var expression = function() {
    return this.createSingleNodeList(
        this.Raw(this.scanner.tokenIndex, null, false)
    );
};

var TYPE$7 = tokenizer.TYPE;

var WhiteSpace = TYPE$7.WhiteSpace;
var Semicolon = TYPE$7.Semicolon;
var LeftCurlyBracket = TYPE$7.LeftCurlyBracket;
var Delim = TYPE$7.Delim;
var EXCLAMATIONMARK = 0x0021; // U+0021 EXCLAMATION MARK (!)

function getOffsetExcludeWS() {
    if (this.scanner.tokenIndex > 0) {
        if (this.scanner.lookupType(-1) === WhiteSpace) {
            return this.scanner.tokenIndex > 1
                ? this.scanner.getTokenStart(this.scanner.tokenIndex - 1)
                : this.scanner.firstCharOffset;
        }
    }

    return this.scanner.tokenStart;
}

// 0, 0, false
function balanceEnd() {
    return 0;
}

// LEFTCURLYBRACKET, 0, false
function leftCurlyBracket(tokenType) {
    return tokenType === LeftCurlyBracket ? 1 : 0;
}

// LEFTCURLYBRACKET, SEMICOLON, false
function leftCurlyBracketOrSemicolon(tokenType) {
    return tokenType === LeftCurlyBracket || tokenType === Semicolon ? 1 : 0;
}

// EXCLAMATIONMARK, SEMICOLON, false
function exclamationMarkOrSemicolon(tokenType, source, offset) {
    if (tokenType === Delim && source.charCodeAt(offset) === EXCLAMATIONMARK) {
        return 1;
    }

    return tokenType === Semicolon ? 1 : 0;
}

// 0, SEMICOLON, true
function semicolonIncluded(tokenType) {
    return tokenType === Semicolon ? 2 : 0;
}

var Raw = {
    name: 'Raw',
    structure: {
        value: String
    },
    parse: function(startToken, mode, excludeWhiteSpace) {
        var startOffset = this.scanner.getTokenStart(startToken);
        var endOffset;

        this.scanner.skip(
            this.scanner.getRawLength(startToken, mode || balanceEnd)
        );

        if (excludeWhiteSpace && this.scanner.tokenStart > startOffset) {
            endOffset = getOffsetExcludeWS.call(this);
        } else {
            endOffset = this.scanner.tokenStart;
        }

        return {
            type: 'Raw',
            loc: this.getLocation(startOffset, endOffset),
            value: this.scanner.source.substring(startOffset, endOffset)
        };
    },
    generate: function(node) {
        this.chunk(node.value);
    },

    mode: {
        default: balanceEnd,
        leftCurlyBracket: leftCurlyBracket,
        leftCurlyBracketOrSemicolon: leftCurlyBracketOrSemicolon,
        exclamationMarkOrSemicolon: exclamationMarkOrSemicolon,
        semicolonIncluded: semicolonIncluded
    }
};

var TYPE$8 = tokenizer.TYPE;
var rawMode = Raw.mode;

var COMMA$1 = TYPE$8.Comma;
var WHITESPACE$3 = TYPE$8.WhiteSpace;

// var( <ident> , <value>? )
var _var = function() {
    var children = this.createList();

    this.scanner.skipSC();

    // NOTE: Don't check more than a first argument is an ident, rest checks are for lexer
    children.push(this.Identifier());

    this.scanner.skipSC();

    if (this.scanner.tokenType === COMMA$1) {
        children.push(this.Operator());

        const startIndex = this.scanner.tokenIndex;
        const value = this.parseCustomProperty
            ? this.Value(null)
            : this.Raw(this.scanner.tokenIndex, rawMode.exclamationMarkOrSemicolon, false);

        if (value.type === 'Value' && value.children.isEmpty()) {
            for (let offset = startIndex - this.scanner.tokenIndex; offset <= 0; offset++) {
                if (this.scanner.lookupType(offset) === WHITESPACE$3) {
                    value.children.appendData({
                        type: 'WhiteSpace',
                        loc: null,
                        value: ' '
                    });
                    break;
                }
            }
        }

        children.push(value);
    }

    return children;
};

var value = {
    getNode: _default,
    'expression': expression,
    'var': _var
};

var scope = {
    AtrulePrelude: atrulePrelude,
    Selector: selector,
    Value: value
};

var fontFace = {
    parse: {
        prelude: null,
        block: function() {
            return this.Block(true);
        }
    }
};

var TYPE$9 = tokenizer.TYPE;

var STRING$1 = TYPE$9.String;
var IDENT$3 = TYPE$9.Ident;
var URL$3 = TYPE$9.Url;
var FUNCTION$2 = TYPE$9.Function;
var LEFTPARENTHESIS$1 = TYPE$9.LeftParenthesis;

var _import = {
    parse: {
        prelude: function() {
            var children = this.createList();

            this.scanner.skipSC();

            switch (this.scanner.tokenType) {
                case STRING$1:
                    children.push(this.String());
                    break;

                case URL$3:
                case FUNCTION$2:
                    children.push(this.Url());
                    break;

                default:
                    this.error('String or url() is expected');
            }

            if (this.lookupNonWSType(0) === IDENT$3 ||
                this.lookupNonWSType(0) === LEFTPARENTHESIS$1) {
                children.push(this.WhiteSpace());
                children.push(this.MediaQueryList());
            }

            return children;
        },
        block: null
    }
};

var media = {
    parse: {
        prelude: function() {
            return this.createSingleNodeList(
                this.MediaQueryList()
            );
        },
        block: function() {
            return this.Block(false);
        }
    }
};

var page = {
    parse: {
        prelude: function() {
            return this.createSingleNodeList(
                this.SelectorList()
            );
        },
        block: function() {
            return this.Block(true);
        }
    }
};

var TYPE$a = tokenizer.TYPE;

var WHITESPACE$4 = TYPE$a.WhiteSpace;
var COMMENT$3 = TYPE$a.Comment;
var IDENT$4 = TYPE$a.Ident;
var FUNCTION$3 = TYPE$a.Function;
var COLON$1 = TYPE$a.Colon;
var LEFTPARENTHESIS$2 = TYPE$a.LeftParenthesis;

function consumeRaw() {
    return this.createSingleNodeList(
        this.Raw(this.scanner.tokenIndex, null, false)
    );
}

function parentheses() {
    this.scanner.skipSC();

    if (this.scanner.tokenType === IDENT$4 &&
        this.lookupNonWSType(1) === COLON$1) {
        return this.createSingleNodeList(
            this.Declaration()
        );
    }

    return readSequence.call(this);
}

function readSequence() {
    var children = this.createList();
    var space = null;
    var child;

    this.scanner.skipSC();

    scan:
    while (!this.scanner.eof) {
        switch (this.scanner.tokenType) {
            case WHITESPACE$4:
                space = this.WhiteSpace();
                continue;

            case COMMENT$3:
                this.scanner.next();
                continue;

            case FUNCTION$3:
                child = this.Function(consumeRaw, this.scope.AtrulePrelude);
                break;

            case IDENT$4:
                child = this.Identifier();
                break;

            case LEFTPARENTHESIS$2:
                child = this.Parentheses(parentheses, this.scope.AtrulePrelude);
                break;

            default:
                break scan;
        }

        if (space !== null) {
            children.push(space);
            space = null;
        }

        children.push(child);
    }

    return children;
}

var supports = {
    parse: {
        prelude: function() {
            var children = readSequence.call(this);

            if (this.getFirstListNode(children) === null) {
                this.error('Condition is expected');
            }

            return children;
        },
        block: function() {
            return this.Block(false);
        }
    }
};

var atrule = {
    'font-face': fontFace,
    'import': _import,
    'media': media,
    'page': page,
    'supports': supports
};

var dir = {
    parse: function() {
        return this.createSingleNodeList(
            this.Identifier()
        );
    }
};

var has$1 = {
    parse: function() {
        return this.createSingleNodeList(
            this.SelectorList()
        );
    }
};

var lang = {
    parse: function() {
        return this.createSingleNodeList(
            this.Identifier()
        );
    }
};

var selectorList = {
    parse: function selectorList() {
        return this.createSingleNodeList(
            this.SelectorList()
        );
    }
};

var matches = selectorList;

var not = selectorList;

var ALLOW_OF_CLAUSE = true;

var nthWithOfClause = {
    parse: function nthWithOfClause() {
        return this.createSingleNodeList(
            this.Nth(ALLOW_OF_CLAUSE)
        );
    }
};

var nthChild = nthWithOfClause;

var nthLastChild = nthWithOfClause;

var DISALLOW_OF_CLAUSE = false;

var nth = {
    parse: function nth() {
        return this.createSingleNodeList(
            this.Nth(DISALLOW_OF_CLAUSE)
        );
    }
};

var nthLastOfType = nth;

var nthOfType = nth;

var slotted = {
    parse: function compoundSelector() {
        return this.createSingleNodeList(
            this.Selector()
        );
    }
};

var pseudo = {
    'dir': dir,
    'has': has$1,
    'lang': lang,
    'matches': matches,
    'not': not,
    'nth-child': nthChild,
    'nth-last-child': nthLastChild,
    'nth-last-of-type': nthLastOfType,
    'nth-of-type': nthOfType,
    'slotted': slotted
};

var cmpChar$2 = tokenizer.cmpChar;
var isDigit$2 = tokenizer.isDigit;
var TYPE$b = tokenizer.TYPE;

var WHITESPACE$5 = TYPE$b.WhiteSpace;
var COMMENT$4 = TYPE$b.Comment;
var IDENT$5 = TYPE$b.Ident;
var NUMBER$3 = TYPE$b.Number;
var DIMENSION$2 = TYPE$b.Dimension;
var PLUSSIGN$2 = 0x002B;    // U+002B PLUS SIGN (+)
var HYPHENMINUS$1 = 0x002D; // U+002D HYPHEN-MINUS (-)
var N$1 = 0x006E;           // U+006E LATIN SMALL LETTER N (n)
var DISALLOW_SIGN = true;
var ALLOW_SIGN = false;

function checkInteger(offset, disallowSign) {
    var pos = this.scanner.tokenStart + offset;
    var code = this.scanner.source.charCodeAt(pos);

    if (code === PLUSSIGN$2 || code === HYPHENMINUS$1) {
        if (disallowSign) {
            this.error('Number sign is not allowed');
        }
        pos++;
    }

    for (; pos < this.scanner.tokenEnd; pos++) {
        if (!isDigit$2(this.scanner.source.charCodeAt(pos))) {
            this.error('Integer is expected', pos);
        }
    }
}

function checkTokenIsInteger(disallowSign) {
    return checkInteger.call(this, 0, disallowSign);
}

function expectCharCode(offset, code) {
    if (!cmpChar$2(this.scanner.source, this.scanner.tokenStart + offset, code)) {
        var msg = '';

        switch (code) {
            case N$1:
                msg = 'N is expected';
                break;
            case HYPHENMINUS$1:
                msg = 'HyphenMinus is expected';
                break;
        }

        this.error(msg, this.scanner.tokenStart + offset);
    }
}

// ... <signed-integer>
// ... ['+' | '-'] <signless-integer>
function consumeB() {
    var offset = 0;
    var sign = 0;
    var type = this.scanner.tokenType;

    while (type === WHITESPACE$5 || type === COMMENT$4) {
        type = this.scanner.lookupType(++offset);
    }

    if (type !== NUMBER$3) {
        if (this.scanner.isDelim(PLUSSIGN$2, offset) ||
            this.scanner.isDelim(HYPHENMINUS$1, offset)) {
            sign = this.scanner.isDelim(PLUSSIGN$2, offset) ? PLUSSIGN$2 : HYPHENMINUS$1;

            do {
                type = this.scanner.lookupType(++offset);
            } while (type === WHITESPACE$5 || type === COMMENT$4);

            if (type !== NUMBER$3) {
                this.scanner.skip(offset);
                checkTokenIsInteger.call(this, DISALLOW_SIGN);
            }
        } else {
            return null;
        }
    }

    if (offset > 0) {
        this.scanner.skip(offset);
    }

    if (sign === 0) {
        type = this.scanner.source.charCodeAt(this.scanner.tokenStart);
        if (type !== PLUSSIGN$2 && type !== HYPHENMINUS$1) {
            this.error('Number sign is expected');
        }
    }

    checkTokenIsInteger.call(this, sign !== 0);
    return sign === HYPHENMINUS$1 ? '-' + this.consume(NUMBER$3) : this.consume(NUMBER$3);
}

// An+B microsyntax https://www.w3.org/TR/css-syntax-3/#anb
var AnPlusB = {
    name: 'AnPlusB',
    structure: {
        a: [String, null],
        b: [String, null]
    },
    parse: function() {
        /* eslint-disable brace-style*/
        var start = this.scanner.tokenStart;
        var a = null;
        var b = null;

        // <integer>
        if (this.scanner.tokenType === NUMBER$3) {
            checkTokenIsInteger.call(this, ALLOW_SIGN);
            b = this.consume(NUMBER$3);
        }

        // -n
        // -n <signed-integer>
        // -n ['+' | '-'] <signless-integer>
        // -n- <signless-integer>
        // <dashndashdigit-ident>
        else if (this.scanner.tokenType === IDENT$5 && cmpChar$2(this.scanner.source, this.scanner.tokenStart, HYPHENMINUS$1)) {
            a = '-1';

            expectCharCode.call(this, 1, N$1);

            switch (this.scanner.getTokenLength()) {
                // -n
                // -n <signed-integer>
                // -n ['+' | '-'] <signless-integer>
                case 2:
                    this.scanner.next();
                    b = consumeB.call(this);
                    break;

                // -n- <signless-integer>
                case 3:
                    expectCharCode.call(this, 2, HYPHENMINUS$1);

                    this.scanner.next();
                    this.scanner.skipSC();

                    checkTokenIsInteger.call(this, DISALLOW_SIGN);

                    b = '-' + this.consume(NUMBER$3);
                    break;

                // <dashndashdigit-ident>
                default:
                    expectCharCode.call(this, 2, HYPHENMINUS$1);
                    checkInteger.call(this, 3, DISALLOW_SIGN);
                    this.scanner.next();

                    b = this.scanner.substrToCursor(start + 2);
            }
        }

        // '+'? n
        // '+'? n <signed-integer>
        // '+'? n ['+' | '-'] <signless-integer>
        // '+'? n- <signless-integer>
        // '+'? <ndashdigit-ident>
        else if (this.scanner.tokenType === IDENT$5 || (this.scanner.isDelim(PLUSSIGN$2) && this.scanner.lookupType(1) === IDENT$5)) {
            var sign = 0;
            a = '1';

            // just ignore a plus
            if (this.scanner.isDelim(PLUSSIGN$2)) {
                sign = 1;
                this.scanner.next();
            }

            expectCharCode.call(this, 0, N$1);

            switch (this.scanner.getTokenLength()) {
                // '+'? n
                // '+'? n <signed-integer>
                // '+'? n ['+' | '-'] <signless-integer>
                case 1:
                    this.scanner.next();
                    b = consumeB.call(this);
                    break;

                // '+'? n- <signless-integer>
                case 2:
                    expectCharCode.call(this, 1, HYPHENMINUS$1);

                    this.scanner.next();
                    this.scanner.skipSC();

                    checkTokenIsInteger.call(this, DISALLOW_SIGN);

                    b = '-' + this.consume(NUMBER$3);
                    break;

                // '+'? <ndashdigit-ident>
                default:
                    expectCharCode.call(this, 1, HYPHENMINUS$1);
                    checkInteger.call(this, 2, DISALLOW_SIGN);
                    this.scanner.next();

                    b = this.scanner.substrToCursor(start + sign + 1);
            }
        }

        // <ndashdigit-dimension>
        // <ndash-dimension> <signless-integer>
        // <n-dimension>
        // <n-dimension> <signed-integer>
        // <n-dimension> ['+' | '-'] <signless-integer>
        else if (this.scanner.tokenType === DIMENSION$2) {
            var code = this.scanner.source.charCodeAt(this.scanner.tokenStart);
            var sign = code === PLUSSIGN$2 || code === HYPHENMINUS$1;

            for (var i = this.scanner.tokenStart + sign; i < this.scanner.tokenEnd; i++) {
                if (!isDigit$2(this.scanner.source.charCodeAt(i))) {
                    break;
                }
            }

            if (i === this.scanner.tokenStart + sign) {
                this.error('Integer is expected', this.scanner.tokenStart + sign);
            }

            expectCharCode.call(this, i - this.scanner.tokenStart, N$1);
            a = this.scanner.source.substring(start, i);

            // <n-dimension>
            // <n-dimension> <signed-integer>
            // <n-dimension> ['+' | '-'] <signless-integer>
            if (i + 1 === this.scanner.tokenEnd) {
                this.scanner.next();
                b = consumeB.call(this);
            } else {
                expectCharCode.call(this, i - this.scanner.tokenStart + 1, HYPHENMINUS$1);

                // <ndash-dimension> <signless-integer>
                if (i + 2 === this.scanner.tokenEnd) {
                    this.scanner.next();
                    this.scanner.skipSC();
                    checkTokenIsInteger.call(this, DISALLOW_SIGN);
                    b = '-' + this.consume(NUMBER$3);
                }
                // <ndashdigit-dimension>
                else {
                    checkInteger.call(this, i - this.scanner.tokenStart + 2, DISALLOW_SIGN);
                    this.scanner.next();
                    b = this.scanner.substrToCursor(i + 1);
                }
            }
        } else {
            this.error();
        }

        if (a !== null && a.charCodeAt(0) === PLUSSIGN$2) {
            a = a.substr(1);
        }

        if (b !== null && b.charCodeAt(0) === PLUSSIGN$2) {
            b = b.substr(1);
        }

        return {
            type: 'AnPlusB',
            loc: this.getLocation(start, this.scanner.tokenStart),
            a: a,
            b: b
        };
    },
    generate: function(node) {
        var a = node.a !== null && node.a !== undefined;
        var b = node.b !== null && node.b !== undefined;

        if (a) {
            this.chunk(
                node.a === '+1' ? '+n' : // eslint-disable-line operator-linebreak, indent
                node.a ===  '1' ?  'n' : // eslint-disable-line operator-linebreak, indent
                node.a === '-1' ? '-n' : // eslint-disable-line operator-linebreak, indent
                node.a + 'n'             // eslint-disable-line operator-linebreak, indent
            );

            if (b) {
                b = String(node.b);
                if (b.charAt(0) === '-' || b.charAt(0) === '+') {
                    this.chunk(b.charAt(0));
                    this.chunk(b.substr(1));
                } else {
                    this.chunk('+');
                    this.chunk(b);
                }
            }
        } else {
            this.chunk(String(node.b));
        }
    }
};

var TYPE$c = tokenizer.TYPE;
var rawMode$1 = Raw.mode;

var ATKEYWORD = TYPE$c.AtKeyword;
var SEMICOLON = TYPE$c.Semicolon;
var LEFTCURLYBRACKET = TYPE$c.LeftCurlyBracket;
var RIGHTCURLYBRACKET = TYPE$c.RightCurlyBracket;

function consumeRaw$1(startToken) {
    return this.Raw(startToken, rawMode$1.leftCurlyBracketOrSemicolon, true);
}

function isDeclarationBlockAtrule() {
    for (var offset = 1, type; type = this.scanner.lookupType(offset); offset++) {
        if (type === RIGHTCURLYBRACKET) {
            return true;
        }

        if (type === LEFTCURLYBRACKET ||
            type === ATKEYWORD) {
            return false;
        }
    }

    return false;
}

var Atrule = {
    name: 'Atrule',
    structure: {
        name: String,
        prelude: ['AtrulePrelude', 'Raw', null],
        block: ['Block', null]
    },
    parse: function() {
        var start = this.scanner.tokenStart;
        var name;
        var nameLowerCase;
        var prelude = null;
        var block = null;

        this.eat(ATKEYWORD);

        name = this.scanner.substrToCursor(start + 1);
        nameLowerCase = name.toLowerCase();
        this.scanner.skipSC();

        // parse prelude
        if (this.scanner.eof === false &&
            this.scanner.tokenType !== LEFTCURLYBRACKET &&
            this.scanner.tokenType !== SEMICOLON) {
            if (this.parseAtrulePrelude) {
                prelude = this.parseWithFallback(this.AtrulePrelude.bind(this, name), consumeRaw$1);

                // turn empty AtrulePrelude into null
                if (prelude.type === 'AtrulePrelude' && prelude.children.head === null) {
                    prelude = null;
                }
            } else {
                prelude = consumeRaw$1.call(this, this.scanner.tokenIndex);
            }

            this.scanner.skipSC();
        }

        switch (this.scanner.tokenType) {
            case SEMICOLON:
                this.scanner.next();
                break;

            case LEFTCURLYBRACKET:
                if (this.atrule.hasOwnProperty(nameLowerCase) &&
                    typeof this.atrule[nameLowerCase].block === 'function') {
                    block = this.atrule[nameLowerCase].block.call(this);
                } else {
                    // TODO: should consume block content as Raw?
                    block = this.Block(isDeclarationBlockAtrule.call(this));
                }

                break;
        }

        return {
            type: 'Atrule',
            loc: this.getLocation(start, this.scanner.tokenStart),
            name: name,
            prelude: prelude,
            block: block
        };
    },
    generate: function(node) {
        this.chunk('@');
        this.chunk(node.name);

        if (node.prelude !== null) {
            this.chunk(' ');
            this.node(node.prelude);
        }

        if (node.block) {
            this.node(node.block);
        } else {
            this.chunk(';');
        }
    },
    walkContext: 'atrule'
};

var TYPE$d = tokenizer.TYPE;

var SEMICOLON$1 = TYPE$d.Semicolon;
var LEFTCURLYBRACKET$1 = TYPE$d.LeftCurlyBracket;

var AtrulePrelude = {
    name: 'AtrulePrelude',
    structure: {
        children: [[]]
    },
    parse: function(name) {
        var children = null;

        if (name !== null) {
            name = name.toLowerCase();
        }

        this.scanner.skipSC();

        if (this.atrule.hasOwnProperty(name) &&
            typeof this.atrule[name].prelude === 'function') {
            // custom consumer
            children = this.atrule[name].prelude.call(this);
        } else {
            // default consumer
            children = this.readSequence(this.scope.AtrulePrelude);
        }

        this.scanner.skipSC();

        if (this.scanner.eof !== true &&
            this.scanner.tokenType !== LEFTCURLYBRACKET$1 &&
            this.scanner.tokenType !== SEMICOLON$1) {
            this.error('Semicolon or block is expected');
        }

        if (children === null) {
            children = this.createList();
        }

        return {
            type: 'AtrulePrelude',
            loc: this.getLocationFromList(children),
            children: children
        };
    },
    generate: function(node) {
        this.children(node);
    },
    walkContext: 'atrulePrelude'
};

var TYPE$e = tokenizer.TYPE;

var IDENT$6 = TYPE$e.Ident;
var STRING$2 = TYPE$e.String;
var COLON$2 = TYPE$e.Colon;
var LEFTSQUAREBRACKET$2 = TYPE$e.LeftSquareBracket;
var RIGHTSQUAREBRACKET = TYPE$e.RightSquareBracket;
var DOLLARSIGN = 0x0024;       // U+0024 DOLLAR SIGN ($)
var ASTERISK$2 = 0x002A;         // U+002A ASTERISK (*)
var EQUALSSIGN = 0x003D;       // U+003D EQUALS SIGN (=)
var CIRCUMFLEXACCENT = 0x005E; // U+005E (^)
var VERTICALLINE$1 = 0x007C;     // U+007C VERTICAL LINE (|)
var TILDE$1 = 0x007E;            // U+007E TILDE (~)

function getAttributeName() {
    if (this.scanner.eof) {
        this.error('Unexpected end of input');
    }

    var start = this.scanner.tokenStart;
    var expectIdent = false;
    var checkColon = true;

    if (this.scanner.isDelim(ASTERISK$2)) {
        expectIdent = true;
        checkColon = false;
        this.scanner.next();
    } else if (!this.scanner.isDelim(VERTICALLINE$1)) {
        this.eat(IDENT$6);
    }

    if (this.scanner.isDelim(VERTICALLINE$1)) {
        if (this.scanner.source.charCodeAt(this.scanner.tokenStart + 1) !== EQUALSSIGN) {
            this.scanner.next();
            this.eat(IDENT$6);
        } else if (expectIdent) {
            this.error('Identifier is expected', this.scanner.tokenEnd);
        }
    } else if (expectIdent) {
        this.error('Vertical line is expected');
    }

    if (checkColon && this.scanner.tokenType === COLON$2) {
        this.scanner.next();
        this.eat(IDENT$6);
    }

    return {
        type: 'Identifier',
        loc: this.getLocation(start, this.scanner.tokenStart),
        name: this.scanner.substrToCursor(start)
    };
}

function getOperator() {
    var start = this.scanner.tokenStart;
    var code = this.scanner.source.charCodeAt(start);

    if (code !== EQUALSSIGN &&        // =
        code !== TILDE$1 &&             // ~=
        code !== CIRCUMFLEXACCENT &&  // ^=
        code !== DOLLARSIGN &&        // $=
        code !== ASTERISK$2 &&          // *=
        code !== VERTICALLINE$1         // |=
    ) {
        this.error('Attribute selector (=, ~=, ^=, $=, *=, |=) is expected');
    }

    this.scanner.next();

    if (code !== EQUALSSIGN) {
        if (!this.scanner.isDelim(EQUALSSIGN)) {
            this.error('Equal sign is expected');
        }

        this.scanner.next();
    }

    return this.scanner.substrToCursor(start);
}

// '[' <wq-name> ']'
// '[' <wq-name> <attr-matcher> [ <string-token> | <ident-token> ] <attr-modifier>? ']'
var AttributeSelector = {
    name: 'AttributeSelector',
    structure: {
        name: 'Identifier',
        matcher: [String, null],
        value: ['String', 'Identifier', null],
        flags: [String, null]
    },
    parse: function() {
        var start = this.scanner.tokenStart;
        var name;
        var matcher = null;
        var value = null;
        var flags = null;

        this.eat(LEFTSQUAREBRACKET$2);
        this.scanner.skipSC();

        name = getAttributeName.call(this);
        this.scanner.skipSC();

        if (this.scanner.tokenType !== RIGHTSQUAREBRACKET) {
            // avoid case `[name i]`
            if (this.scanner.tokenType !== IDENT$6) {
                matcher = getOperator.call(this);

                this.scanner.skipSC();

                value = this.scanner.tokenType === STRING$2
                    ? this.String()
                    : this.Identifier();

                this.scanner.skipSC();
            }

            // attribute flags
            if (this.scanner.tokenType === IDENT$6) {
                flags = this.scanner.getTokenValue();
                this.scanner.next();

                this.scanner.skipSC();
            }
        }

        this.eat(RIGHTSQUAREBRACKET);

        return {
            type: 'AttributeSelector',
            loc: this.getLocation(start, this.scanner.tokenStart),
            name: name,
            matcher: matcher,
            value: value,
            flags: flags
        };
    },
    generate: function(node) {
        var flagsPrefix = ' ';

        this.chunk('[');
        this.node(node.name);

        if (node.matcher !== null) {
            this.chunk(node.matcher);

            if (node.value !== null) {
                this.node(node.value);

                // space between string and flags is not required
                if (node.value.type === 'String') {
                    flagsPrefix = '';
                }
            }
        }

        if (node.flags !== null) {
            this.chunk(flagsPrefix);
            this.chunk(node.flags);
        }

        this.chunk(']');
    }
};

var TYPE$f = tokenizer.TYPE;
var rawMode$2 = Raw.mode;

var WHITESPACE$6 = TYPE$f.WhiteSpace;
var COMMENT$5 = TYPE$f.Comment;
var SEMICOLON$2 = TYPE$f.Semicolon;
var ATKEYWORD$1 = TYPE$f.AtKeyword;
var LEFTCURLYBRACKET$2 = TYPE$f.LeftCurlyBracket;
var RIGHTCURLYBRACKET$1 = TYPE$f.RightCurlyBracket;

function consumeRaw$2(startToken) {
    return this.Raw(startToken, null, true);
}
function consumeRule() {
    return this.parseWithFallback(this.Rule, consumeRaw$2);
}
function consumeRawDeclaration(startToken) {
    return this.Raw(startToken, rawMode$2.semicolonIncluded, true);
}
function consumeDeclaration() {
    if (this.scanner.tokenType === SEMICOLON$2) {
        return consumeRawDeclaration.call(this, this.scanner.tokenIndex);
    }

    var node = this.parseWithFallback(this.Declaration, consumeRawDeclaration);

    if (this.scanner.tokenType === SEMICOLON$2) {
        this.scanner.next();
    }

    return node;
}

var Block = {
    name: 'Block',
    structure: {
        children: [[
            'Atrule',
            'Rule',
            'Declaration'
        ]]
    },
    parse: function(isDeclaration) {
        var consumer = isDeclaration ? consumeDeclaration : consumeRule;

        var start = this.scanner.tokenStart;
        var children = this.createList();

        this.eat(LEFTCURLYBRACKET$2);

        scan:
        while (!this.scanner.eof) {
            switch (this.scanner.tokenType) {
                case RIGHTCURLYBRACKET$1:
                    break scan;

                case WHITESPACE$6:
                case COMMENT$5:
                    this.scanner.next();
                    break;

                case ATKEYWORD$1:
                    children.push(this.parseWithFallback(this.Atrule, consumeRaw$2));
                    break;

                default:
                    children.push(consumer.call(this));
            }
        }

        if (!this.scanner.eof) {
            this.eat(RIGHTCURLYBRACKET$1);
        }

        return {
            type: 'Block',
            loc: this.getLocation(start, this.scanner.tokenStart),
            children: children
        };
    },
    generate: function(node) {
        this.chunk('{');
        this.children(node, function(prev) {
            if (prev.type === 'Declaration') {
                this.chunk(';');
            }
        });
        this.chunk('}');
    },
    walkContext: 'block'
};

var TYPE$g = tokenizer.TYPE;

var LEFTSQUAREBRACKET$3 = TYPE$g.LeftSquareBracket;
var RIGHTSQUAREBRACKET$1 = TYPE$g.RightSquareBracket;

var Brackets = {
    name: 'Brackets',
    structure: {
        children: [[]]
    },
    parse: function(readSequence, recognizer) {
        var start = this.scanner.tokenStart;
        var children = null;

        this.eat(LEFTSQUAREBRACKET$3);

        children = readSequence.call(this, recognizer);

        if (!this.scanner.eof) {
            this.eat(RIGHTSQUAREBRACKET$1);
        }

        return {
            type: 'Brackets',
            loc: this.getLocation(start, this.scanner.tokenStart),
            children: children
        };
    },
    generate: function(node) {
        this.chunk('[');
        this.children(node);
        this.chunk(']');
    }
};

var CDC = tokenizer.TYPE.CDC;

var CDC_1 = {
    name: 'CDC',
    structure: [],
    parse: function() {
        var start = this.scanner.tokenStart;

        this.eat(CDC); // -->

        return {
            type: 'CDC',
            loc: this.getLocation(start, this.scanner.tokenStart)
        };
    },
    generate: function() {
        this.chunk('-->');
    }
};

var CDO = tokenizer.TYPE.CDO;

var CDO_1 = {
    name: 'CDO',
    structure: [],
    parse: function() {
        var start = this.scanner.tokenStart;

        this.eat(CDO); // <!--

        return {
            type: 'CDO',
            loc: this.getLocation(start, this.scanner.tokenStart)
        };
    },
    generate: function() {
        this.chunk('<!--');
    }
};

var TYPE$h = tokenizer.TYPE;

var IDENT$7 = TYPE$h.Ident;
var FULLSTOP$1 = 0x002E; // U+002E FULL STOP (.)

// '.' ident
var ClassSelector = {
    name: 'ClassSelector',
    structure: {
        name: String
    },
    parse: function() {
        if (!this.scanner.isDelim(FULLSTOP$1)) {
            this.error('Full stop is expected');
        }

        this.scanner.next();

        return {
            type: 'ClassSelector',
            loc: this.getLocation(this.scanner.tokenStart - 1, this.scanner.tokenEnd),
            name: this.consume(IDENT$7)
        };
    },
    generate: function(node) {
        this.chunk('.');
        this.chunk(node.name);
    }
};

var TYPE$i = tokenizer.TYPE;

var IDENT$8 = TYPE$i.Ident;
var PLUSSIGN$3 = 0x002B;        // U+002B PLUS SIGN (+)
var SOLIDUS$2 = 0x002F;         // U+002F SOLIDUS (/)
var GREATERTHANSIGN$1 = 0x003E; // U+003E GREATER-THAN SIGN (>)
var TILDE$2 = 0x007E;           // U+007E TILDE (~)

// + | > | ~ | /deep/
var Combinator = {
    name: 'Combinator',
    structure: {
        name: String
    },
    parse: function() {
        var start = this.scanner.tokenStart;
        var code = this.scanner.source.charCodeAt(this.scanner.tokenStart);

        switch (code) {
            case GREATERTHANSIGN$1:
            case PLUSSIGN$3:
            case TILDE$2:
                this.scanner.next();
                break;

            case SOLIDUS$2:
                this.scanner.next();

                if (this.scanner.tokenType !== IDENT$8 || this.scanner.lookupValue(0, 'deep') === false) {
                    this.error('Identifier `deep` is expected');
                }

                this.scanner.next();

                if (!this.scanner.isDelim(SOLIDUS$2)) {
                    this.error('Solidus is expected');
                }

                this.scanner.next();
                break;

            default:
                this.error('Combinator is expected');
        }

        return {
            type: 'Combinator',
            loc: this.getLocation(start, this.scanner.tokenStart),
            name: this.scanner.substrToCursor(start)
        };
    },
    generate: function(node) {
        this.chunk(node.name);
    }
};

var TYPE$j = tokenizer.TYPE;

var COMMENT$6 = TYPE$j.Comment;
var ASTERISK$3 = 0x002A;        // U+002A ASTERISK (*)
var SOLIDUS$3 = 0x002F;         // U+002F SOLIDUS (/)

// '/*' .* '*/'
var Comment = {
    name: 'Comment',
    structure: {
        value: String
    },
    parse: function() {
        var start = this.scanner.tokenStart;
        var end = this.scanner.tokenEnd;

        this.eat(COMMENT$6);

        if ((end - start + 2) >= 2 &&
            this.scanner.source.charCodeAt(end - 2) === ASTERISK$3 &&
            this.scanner.source.charCodeAt(end - 1) === SOLIDUS$3) {
            end -= 2;
        }

        return {
            type: 'Comment',
            loc: this.getLocation(start, this.scanner.tokenStart),
            value: this.scanner.source.substring(start + 2, end)
        };
    },
    generate: function(node) {
        this.chunk('/*');
        this.chunk(node.value);
        this.chunk('*/');
    }
};

var hasOwnProperty$1 = Object.prototype.hasOwnProperty;
var keywords$2 = Object.create(null);
var properties = Object.create(null);
var HYPHENMINUS$2 = 45; // '-'.charCodeAt()

function isCustomProperty(str, offset) {
    offset = offset || 0;

    return str.length - offset >= 2 &&
           str.charCodeAt(offset) === HYPHENMINUS$2 &&
           str.charCodeAt(offset + 1) === HYPHENMINUS$2;
}

function getVendorPrefix(str, offset) {
    offset = offset || 0;

    // verdor prefix should be at least 3 chars length
    if (str.length - offset >= 3) {
        // vendor prefix starts with hyper minus following non-hyper minus
        if (str.charCodeAt(offset) === HYPHENMINUS$2 &&
            str.charCodeAt(offset + 1) !== HYPHENMINUS$2) {
            // vendor prefix should contain a hyper minus at the ending
            var secondDashIndex = str.indexOf('-', offset + 2);

            if (secondDashIndex !== -1) {
                return str.substring(offset, secondDashIndex + 1);
            }
        }
    }

    return '';
}

function getKeywordDescriptor(keyword) {
    if (hasOwnProperty$1.call(keywords$2, keyword)) {
        return keywords$2[keyword];
    }

    var name = keyword.toLowerCase();

    if (hasOwnProperty$1.call(keywords$2, name)) {
        return keywords$2[keyword] = keywords$2[name];
    }

    var custom = isCustomProperty(name, 0);
    var vendor = !custom ? getVendorPrefix(name, 0) : '';

    return keywords$2[keyword] = Object.freeze({
        basename: name.substr(vendor.length),
        name: name,
        vendor: vendor,
        prefix: vendor,
        custom: custom
    });
}

function getPropertyDescriptor(property) {
    if (hasOwnProperty$1.call(properties, property)) {
        return properties[property];
    }

    var name = property;
    var hack = property[0];

    if (hack === '/') {
        hack = property[1] === '/' ? '//' : '/';
    } else if (hack !== '_' &&
               hack !== '*' &&
               hack !== '$' &&
               hack !== '#' &&
               hack !== '+' &&
               hack !== '&') {
        hack = '';
    }

    var custom = isCustomProperty(name, hack.length);

    // re-use result when possible (the same as for lower case)
    if (!custom) {
        name = name.toLowerCase();
        if (hasOwnProperty$1.call(properties, name)) {
            return properties[property] = properties[name];
        }
    }

    var vendor = !custom ? getVendorPrefix(name, hack.length) : '';
    var prefix = name.substr(0, hack.length + vendor.length);

    return properties[property] = Object.freeze({
        basename: name.substr(prefix.length),
        name: name.substr(hack.length),
        hack: hack,
        vendor: vendor,
        prefix: prefix,
        custom: custom
    });
}

var names = {
    keyword: getKeywordDescriptor,
    property: getPropertyDescriptor,
    isCustomProperty: isCustomProperty,
    vendorPrefix: getVendorPrefix
};

var isCustomProperty$1 = names.isCustomProperty;
var TYPE$k = tokenizer.TYPE;
var rawMode$3 = Raw.mode;

var IDENT$9 = TYPE$k.Ident;
var HASH$3 = TYPE$k.Hash;
var COLON$3 = TYPE$k.Colon;
var SEMICOLON$3 = TYPE$k.Semicolon;
var DELIM$2 = TYPE$k.Delim;
var WHITESPACE$7 = TYPE$k.WhiteSpace;
var EXCLAMATIONMARK$1 = 0x0021; // U+0021 EXCLAMATION MARK (!)
var NUMBERSIGN$3 = 0x0023;      // U+0023 NUMBER SIGN (#)
var DOLLARSIGN$1 = 0x0024;      // U+0024 DOLLAR SIGN ($)
var AMPERSAND = 0x0026;       // U+0026 ANPERSAND (&)
var ASTERISK$4 = 0x002A;        // U+002A ASTERISK (*)
var PLUSSIGN$4 = 0x002B;        // U+002B PLUS SIGN (+)
var SOLIDUS$4 = 0x002F;         // U+002F SOLIDUS (/)

function consumeValueRaw(startToken) {
    return this.Raw(startToken, rawMode$3.exclamationMarkOrSemicolon, true);
}

function consumeCustomPropertyRaw(startToken) {
    return this.Raw(startToken, rawMode$3.exclamationMarkOrSemicolon, false);
}

function consumeValue() {
    var startValueToken = this.scanner.tokenIndex;
    var value = this.Value();

    if (value.type !== 'Raw' &&
        this.scanner.eof === false &&
        this.scanner.tokenType !== SEMICOLON$3 &&
        this.scanner.isDelim(EXCLAMATIONMARK$1) === false &&
        this.scanner.isBalanceEdge(startValueToken) === false) {
        this.error();
    }

    return value;
}

var Declaration = {
    name: 'Declaration',
    structure: {
        important: [Boolean, String],
        property: String,
        value: ['Value', 'Raw']
    },
    parse: function() {
        var start = this.scanner.tokenStart;
        var startToken = this.scanner.tokenIndex;
        var property = readProperty.call(this);
        var customProperty = isCustomProperty$1(property);
        var parseValue = customProperty ? this.parseCustomProperty : this.parseValue;
        var consumeRaw = customProperty ? consumeCustomPropertyRaw : consumeValueRaw;
        var important = false;
        var value;

        this.scanner.skipSC();
        this.eat(COLON$3);

        const valueStart = this.scanner.tokenIndex;

        if (!customProperty) {
            this.scanner.skipSC();
        }

        if (parseValue) {
            value = this.parseWithFallback(consumeValue, consumeRaw);
        } else {
            value = consumeRaw.call(this, this.scanner.tokenIndex);
        }

        if (customProperty && value.type === 'Value' && value.children.isEmpty()) {
            for (let offset = valueStart - this.scanner.tokenIndex; offset <= 0; offset++) {
                if (this.scanner.lookupType(offset) === WHITESPACE$7) {
                    value.children.appendData({
                        type: 'WhiteSpace',
                        loc: null,
                        value: ' '
                    });
                    break;
                }
            }
        }

        if (this.scanner.isDelim(EXCLAMATIONMARK$1)) {
            important = getImportant.call(this);
            this.scanner.skipSC();
        }

        // Do not include semicolon to range per spec
        // https://drafts.csswg.org/css-syntax/#declaration-diagram

        if (this.scanner.eof === false &&
            this.scanner.tokenType !== SEMICOLON$3 &&
            this.scanner.isBalanceEdge(startToken) === false) {
            this.error();
        }

        return {
            type: 'Declaration',
            loc: this.getLocation(start, this.scanner.tokenStart),
            important: important,
            property: property,
            value: value
        };
    },
    generate: function(node) {
        this.chunk(node.property);
        this.chunk(':');
        this.node(node.value);

        if (node.important) {
            this.chunk(node.important === true ? '!important' : '!' + node.important);
        }
    },
    walkContext: 'declaration'
};

function readProperty() {
    var start = this.scanner.tokenStart;

    // hacks
    if (this.scanner.tokenType === DELIM$2) {
        switch (this.scanner.source.charCodeAt(this.scanner.tokenStart)) {
            case ASTERISK$4:
            case DOLLARSIGN$1:
            case PLUSSIGN$4:
            case NUMBERSIGN$3:
            case AMPERSAND:
                this.scanner.next();
                break;

            // TODO: not sure we should support this hack
            case SOLIDUS$4:
                this.scanner.next();
                if (this.scanner.isDelim(SOLIDUS$4)) {
                    this.scanner.next();
                }
                break;
        }
    }

    if (this.scanner.tokenType === HASH$3) {
        this.eat(HASH$3);
    } else {
        this.eat(IDENT$9);
    }

    return this.scanner.substrToCursor(start);
}

// ! ws* important
function getImportant() {
    this.eat(DELIM$2);
    this.scanner.skipSC();

    var important = this.consume(IDENT$9);

    // store original value in case it differ from `important`
    // for better original source restoring and hacks like `!ie` support
    return important === 'important' ? true : important;
}

var TYPE$l = tokenizer.TYPE;
var rawMode$4 = Raw.mode;

var WHITESPACE$8 = TYPE$l.WhiteSpace;
var COMMENT$7 = TYPE$l.Comment;
var SEMICOLON$4 = TYPE$l.Semicolon;

function consumeRaw$3(startToken) {
    return this.Raw(startToken, rawMode$4.semicolonIncluded, true);
}

var DeclarationList = {
    name: 'DeclarationList',
    structure: {
        children: [[
            'Declaration'
        ]]
    },
    parse: function() {
        var children = this.createList();

        
        while (!this.scanner.eof) {
            switch (this.scanner.tokenType) {
                case WHITESPACE$8:
                case COMMENT$7:
                case SEMICOLON$4:
                    this.scanner.next();
                    break;

                default:
                    children.push(this.parseWithFallback(this.Declaration, consumeRaw$3));
            }
        }

        return {
            type: 'DeclarationList',
            loc: this.getLocationFromList(children),
            children: children
        };
    },
    generate: function(node) {
        this.children(node, function(prev) {
            if (prev.type === 'Declaration') {
                this.chunk(';');
            }
        });
    }
};

var consumeNumber$2 = utils.consumeNumber;
var TYPE$m = tokenizer.TYPE;

var DIMENSION$3 = TYPE$m.Dimension;

var Dimension = {
    name: 'Dimension',
    structure: {
        value: String,
        unit: String
    },
    parse: function() {
        var start = this.scanner.tokenStart;
        var numberEnd = consumeNumber$2(this.scanner.source, start);

        this.eat(DIMENSION$3);

        return {
            type: 'Dimension',
            loc: this.getLocation(start, this.scanner.tokenStart),
            value: this.scanner.source.substring(start, numberEnd),
            unit: this.scanner.source.substring(numberEnd, this.scanner.tokenStart)
        };
    },
    generate: function(node) {
        this.chunk(node.value);
        this.chunk(node.unit);
    }
};

var TYPE$n = tokenizer.TYPE;

var RIGHTPARENTHESIS = TYPE$n.RightParenthesis;

// <function-token> <sequence> )
var _Function = {
    name: 'Function',
    structure: {
        name: String,
        children: [[]]
    },
    parse: function(readSequence, recognizer) {
        var start = this.scanner.tokenStart;
        var name = this.consumeFunctionName();
        var nameLowerCase = name.toLowerCase();
        var children;

        children = recognizer.hasOwnProperty(nameLowerCase)
            ? recognizer[nameLowerCase].call(this, recognizer)
            : readSequence.call(this, recognizer);

        if (!this.scanner.eof) {
            this.eat(RIGHTPARENTHESIS);
        }

        return {
            type: 'Function',
            loc: this.getLocation(start, this.scanner.tokenStart),
            name: name,
            children: children
        };
    },
    generate: function(node) {
        this.chunk(node.name);
        this.chunk('(');
        this.children(node);
        this.chunk(')');
    },
    walkContext: 'function'
};

var TYPE$o = tokenizer.TYPE;

var HASH$4 = TYPE$o.Hash;

// '#' ident
var Hash = {
    name: 'Hash',
    structure: {
        value: String
    },
    parse: function() {
        var start = this.scanner.tokenStart;

        this.eat(HASH$4);

        return {
            type: 'Hash',
            loc: this.getLocation(start, this.scanner.tokenStart),
            value: this.scanner.substrToCursor(start + 1)
        };
    },
    generate: function(node) {
        this.chunk('#');
        this.chunk(node.value);
    }
};

var TYPE$p = tokenizer.TYPE;

var IDENT$a = TYPE$p.Ident;

var Identifier = {
    name: 'Identifier',
    structure: {
        name: String
    },
    parse: function() {
        return {
            type: 'Identifier',
            loc: this.getLocation(this.scanner.tokenStart, this.scanner.tokenEnd),
            name: this.consume(IDENT$a)
        };
    },
    generate: function(node) {
        this.chunk(node.name);
    }
};

var TYPE$q = tokenizer.TYPE;

var HASH$5 = TYPE$q.Hash;

// <hash-token>
var IdSelector = {
    name: 'IdSelector',
    structure: {
        name: String
    },
    parse: function() {
        var start = this.scanner.tokenStart;

        // TODO: check value is an ident
        this.eat(HASH$5);

        return {
            type: 'IdSelector',
            loc: this.getLocation(start, this.scanner.tokenStart),
            name: this.scanner.substrToCursor(start + 1)
        };
    },
    generate: function(node) {
        this.chunk('#');
        this.chunk(node.name);
    }
};

var TYPE$r = tokenizer.TYPE;

var IDENT$b = TYPE$r.Ident;
var NUMBER$4 = TYPE$r.Number;
var DIMENSION$4 = TYPE$r.Dimension;
var LEFTPARENTHESIS$3 = TYPE$r.LeftParenthesis;
var RIGHTPARENTHESIS$1 = TYPE$r.RightParenthesis;
var COLON$4 = TYPE$r.Colon;
var DELIM$3 = TYPE$r.Delim;

var MediaFeature = {
    name: 'MediaFeature',
    structure: {
        name: String,
        value: ['Identifier', 'Number', 'Dimension', 'Ratio', null]
    },
    parse: function() {
        var start = this.scanner.tokenStart;
        var name;
        var value = null;

        this.eat(LEFTPARENTHESIS$3);
        this.scanner.skipSC();

        name = this.consume(IDENT$b);
        this.scanner.skipSC();

        if (this.scanner.tokenType !== RIGHTPARENTHESIS$1) {
            this.eat(COLON$4);
            this.scanner.skipSC();

            switch (this.scanner.tokenType) {
                case NUMBER$4:
                    if (this.lookupNonWSType(1) === DELIM$3) {
                        value = this.Ratio();
                    } else {
                        value = this.Number();
                    }

                    break;

                case DIMENSION$4:
                    value = this.Dimension();
                    break;

                case IDENT$b:
                    value = this.Identifier();

                    break;

                default:
                    this.error('Number, dimension, ratio or identifier is expected');
            }

            this.scanner.skipSC();
        }

        this.eat(RIGHTPARENTHESIS$1);

        return {
            type: 'MediaFeature',
            loc: this.getLocation(start, this.scanner.tokenStart),
            name: name,
            value: value
        };
    },
    generate: function(node) {
        this.chunk('(');
        this.chunk(node.name);
        if (node.value !== null) {
            this.chunk(':');
            this.node(node.value);
        }
        this.chunk(')');
    }
};

var TYPE$s = tokenizer.TYPE;

var WHITESPACE$9 = TYPE$s.WhiteSpace;
var COMMENT$8 = TYPE$s.Comment;
var IDENT$c = TYPE$s.Ident;
var LEFTPARENTHESIS$4 = TYPE$s.LeftParenthesis;

var MediaQuery = {
    name: 'MediaQuery',
    structure: {
        children: [[
            'Identifier',
            'MediaFeature',
            'WhiteSpace'
        ]]
    },
    parse: function() {
        this.scanner.skipSC();

        var children = this.createList();
        var child = null;
        var space = null;

        scan:
        while (!this.scanner.eof) {
            switch (this.scanner.tokenType) {
                case COMMENT$8:
                    this.scanner.next();
                    continue;

                case WHITESPACE$9:
                    space = this.WhiteSpace();
                    continue;

                case IDENT$c:
                    child = this.Identifier();
                    break;

                case LEFTPARENTHESIS$4:
                    child = this.MediaFeature();
                    break;

                default:
                    break scan;
            }

            if (space !== null) {
                children.push(space);
                space = null;
            }

            children.push(child);
        }

        if (child === null) {
            this.error('Identifier or parenthesis is expected');
        }

        return {
            type: 'MediaQuery',
            loc: this.getLocationFromList(children),
            children: children
        };
    },
    generate: function(node) {
        this.children(node);
    }
};

var COMMA$2 = tokenizer.TYPE.Comma;

var MediaQueryList = {
    name: 'MediaQueryList',
    structure: {
        children: [[
            'MediaQuery'
        ]]
    },
    parse: function(relative) {
        var children = this.createList();

        this.scanner.skipSC();

        while (!this.scanner.eof) {
            children.push(this.MediaQuery(relative));

            if (this.scanner.tokenType !== COMMA$2) {
                break;
            }

            this.scanner.next();
        }

        return {
            type: 'MediaQueryList',
            loc: this.getLocationFromList(children),
            children: children
        };
    },
    generate: function(node) {
        this.children(node, function() {
            this.chunk(',');
        });
    }
};

var Nth = {
    name: 'Nth',
    structure: {
        nth: ['AnPlusB', 'Identifier'],
        selector: ['SelectorList', null]
    },
    parse: function(allowOfClause) {
        this.scanner.skipSC();

        var start = this.scanner.tokenStart;
        var end = start;
        var selector = null;
        var query;

        if (this.scanner.lookupValue(0, 'odd') || this.scanner.lookupValue(0, 'even')) {
            query = this.Identifier();
        } else {
            query = this.AnPlusB();
        }

        this.scanner.skipSC();

        if (allowOfClause && this.scanner.lookupValue(0, 'of')) {
            this.scanner.next();

            selector = this.SelectorList();

            if (this.needPositions) {
                end = this.getLastListNode(selector.children).loc.end.offset;
            }
        } else {
            if (this.needPositions) {
                end = query.loc.end.offset;
            }
        }

        return {
            type: 'Nth',
            loc: this.getLocation(start, end),
            nth: query,
            selector: selector
        };
    },
    generate: function(node) {
        this.node(node.nth);
        if (node.selector !== null) {
            this.chunk(' of ');
            this.node(node.selector);
        }
    }
};

var NUMBER$5 = tokenizer.TYPE.Number;

var _Number = {
    name: 'Number',
    structure: {
        value: String
    },
    parse: function() {
        return {
            type: 'Number',
            loc: this.getLocation(this.scanner.tokenStart, this.scanner.tokenEnd),
            value: this.consume(NUMBER$5)
        };
    },
    generate: function(node) {
        this.chunk(node.value);
    }
};

// '/' | '*' | ',' | ':' | '+' | '-'
var Operator = {
    name: 'Operator',
    structure: {
        value: String
    },
    parse: function() {
        var start = this.scanner.tokenStart;

        this.scanner.next();

        return {
            type: 'Operator',
            loc: this.getLocation(start, this.scanner.tokenStart),
            value: this.scanner.substrToCursor(start)
        };
    },
    generate: function(node) {
        this.chunk(node.value);
    }
};

var TYPE$t = tokenizer.TYPE;

var LEFTPARENTHESIS$5 = TYPE$t.LeftParenthesis;
var RIGHTPARENTHESIS$2 = TYPE$t.RightParenthesis;

var Parentheses = {
    name: 'Parentheses',
    structure: {
        children: [[]]
    },
    parse: function(readSequence, recognizer) {
        var start = this.scanner.tokenStart;
        var children = null;

        this.eat(LEFTPARENTHESIS$5);

        children = readSequence.call(this, recognizer);

        if (!this.scanner.eof) {
            this.eat(RIGHTPARENTHESIS$2);
        }

        return {
            type: 'Parentheses',
            loc: this.getLocation(start, this.scanner.tokenStart),
            children: children
        };
    },
    generate: function(node) {
        this.chunk('(');
        this.children(node);
        this.chunk(')');
    }
};

var consumeNumber$3 = utils.consumeNumber;
var TYPE$u = tokenizer.TYPE;

var PERCENTAGE$3 = TYPE$u.Percentage;

var Percentage = {
    name: 'Percentage',
    structure: {
        value: String
    },
    parse: function() {
        var start = this.scanner.tokenStart;
        var numberEnd = consumeNumber$3(this.scanner.source, start);

        this.eat(PERCENTAGE$3);

        return {
            type: 'Percentage',
            loc: this.getLocation(start, this.scanner.tokenStart),
            value: this.scanner.source.substring(start, numberEnd)
        };
    },
    generate: function(node) {
        this.chunk(node.value);
        this.chunk('%');
    }
};

var TYPE$v = tokenizer.TYPE;

var IDENT$d = TYPE$v.Ident;
var FUNCTION$4 = TYPE$v.Function;
var COLON$5 = TYPE$v.Colon;
var RIGHTPARENTHESIS$3 = TYPE$v.RightParenthesis;

// : [ <ident> | <function-token> <any-value>? ) ]
var PseudoClassSelector = {
    name: 'PseudoClassSelector',
    structure: {
        name: String,
        children: [['Raw'], null]
    },
    parse: function() {
        var start = this.scanner.tokenStart;
        var children = null;
        var name;
        var nameLowerCase;

        this.eat(COLON$5);

        if (this.scanner.tokenType === FUNCTION$4) {
            name = this.consumeFunctionName();
            nameLowerCase = name.toLowerCase();

            if (this.pseudo.hasOwnProperty(nameLowerCase)) {
                this.scanner.skipSC();
                children = this.pseudo[nameLowerCase].call(this);
                this.scanner.skipSC();
            } else {
                children = this.createList();
                children.push(
                    this.Raw(this.scanner.tokenIndex, null, false)
                );
            }

            this.eat(RIGHTPARENTHESIS$3);
        } else {
            name = this.consume(IDENT$d);
        }

        return {
            type: 'PseudoClassSelector',
            loc: this.getLocation(start, this.scanner.tokenStart),
            name: name,
            children: children
        };
    },
    generate: function(node) {
        this.chunk(':');
        this.chunk(node.name);

        if (node.children !== null) {
            this.chunk('(');
            this.children(node);
            this.chunk(')');
        }
    },
    walkContext: 'function'
};

var TYPE$w = tokenizer.TYPE;

var IDENT$e = TYPE$w.Ident;
var FUNCTION$5 = TYPE$w.Function;
var COLON$6 = TYPE$w.Colon;
var RIGHTPARENTHESIS$4 = TYPE$w.RightParenthesis;

// :: [ <ident> | <function-token> <any-value>? ) ]
var PseudoElementSelector = {
    name: 'PseudoElementSelector',
    structure: {
        name: String,
        children: [['Raw'], null]
    },
    parse: function() {
        var start = this.scanner.tokenStart;
        var children = null;
        var name;
        var nameLowerCase;

        this.eat(COLON$6);
        this.eat(COLON$6);

        if (this.scanner.tokenType === FUNCTION$5) {
            name = this.consumeFunctionName();
            nameLowerCase = name.toLowerCase();

            if (this.pseudo.hasOwnProperty(nameLowerCase)) {
                this.scanner.skipSC();
                children = this.pseudo[nameLowerCase].call(this);
                this.scanner.skipSC();
            } else {
                children = this.createList();
                children.push(
                    this.Raw(this.scanner.tokenIndex, null, false)
                );
            }

            this.eat(RIGHTPARENTHESIS$4);
        } else {
            name = this.consume(IDENT$e);
        }

        return {
            type: 'PseudoElementSelector',
            loc: this.getLocation(start, this.scanner.tokenStart),
            name: name,
            children: children
        };
    },
    generate: function(node) {
        this.chunk('::');
        this.chunk(node.name);

        if (node.children !== null) {
            this.chunk('(');
            this.children(node);
            this.chunk(')');
        }
    },
    walkContext: 'function'
};

var isDigit$3 = tokenizer.isDigit;
var TYPE$x = tokenizer.TYPE;

var NUMBER$6 = TYPE$x.Number;
var DELIM$4 = TYPE$x.Delim;
var SOLIDUS$5 = 0x002F;  // U+002F SOLIDUS (/)
var FULLSTOP$2 = 0x002E; // U+002E FULL STOP (.)

// Terms of <ratio> should be a positive numbers (not zero or negative)
// (see https://drafts.csswg.org/mediaqueries-3/#values)
// However, -o-min-device-pixel-ratio takes fractional values as a ratio's term
// and this is using by various sites. Therefore we relax checking on parse
// to test a term is unsigned number without an exponent part.
// Additional checking may be applied on lexer validation.
function consumeNumber$4() {
    this.scanner.skipWS();

    var value = this.consume(NUMBER$6);

    for (var i = 0; i < value.length; i++) {
        var code = value.charCodeAt(i);
        if (!isDigit$3(code) && code !== FULLSTOP$2) {
            this.error('Unsigned number is expected', this.scanner.tokenStart - value.length + i);
        }
    }

    if (Number(value) === 0) {
        this.error('Zero number is not allowed', this.scanner.tokenStart - value.length);
    }

    return value;
}

// <positive-integer> S* '/' S* <positive-integer>
var Ratio = {
    name: 'Ratio',
    structure: {
        left: String,
        right: String
    },
    parse: function() {
        var start = this.scanner.tokenStart;
        var left = consumeNumber$4.call(this);
        var right;

        this.scanner.skipWS();

        if (!this.scanner.isDelim(SOLIDUS$5)) {
            this.error('Solidus is expected');
        }
        this.eat(DELIM$4);
        right = consumeNumber$4.call(this);

        return {
            type: 'Ratio',
            loc: this.getLocation(start, this.scanner.tokenStart),
            left: left,
            right: right
        };
    },
    generate: function(node) {
        this.chunk(node.left);
        this.chunk('/');
        this.chunk(node.right);
    }
};

var TYPE$y = tokenizer.TYPE;
var rawMode$5 = Raw.mode;

var LEFTCURLYBRACKET$3 = TYPE$y.LeftCurlyBracket;

function consumeRaw$4(startToken) {
    return this.Raw(startToken, rawMode$5.leftCurlyBracket, true);
}

function consumePrelude() {
    var prelude = this.SelectorList();

    if (prelude.type !== 'Raw' &&
        this.scanner.eof === false &&
        this.scanner.tokenType !== LEFTCURLYBRACKET$3) {
        this.error();
    }

    return prelude;
}

var Rule = {
    name: 'Rule',
    structure: {
        prelude: ['SelectorList', 'Raw'],
        block: ['Block']
    },
    parse: function() {
        var startToken = this.scanner.tokenIndex;
        var startOffset = this.scanner.tokenStart;
        var prelude;
        var block;

        if (this.parseRulePrelude) {
            prelude = this.parseWithFallback(consumePrelude, consumeRaw$4);
        } else {
            prelude = consumeRaw$4.call(this, startToken);
        }

        block = this.Block(true);

        return {
            type: 'Rule',
            loc: this.getLocation(startOffset, this.scanner.tokenStart),
            prelude: prelude,
            block: block
        };
    },
    generate: function(node) {
        this.node(node.prelude);
        this.node(node.block);
    },
    walkContext: 'rule'
};

var Selector = {
    name: 'Selector',
    structure: {
        children: [[
            'TypeSelector',
            'IdSelector',
            'ClassSelector',
            'AttributeSelector',
            'PseudoClassSelector',
            'PseudoElementSelector',
            'Combinator',
            'WhiteSpace'
        ]]
    },
    parse: function() {
        var children = this.readSequence(this.scope.Selector);

        // nothing were consumed
        if (this.getFirstListNode(children) === null) {
            this.error('Selector is expected');
        }

        return {
            type: 'Selector',
            loc: this.getLocationFromList(children),
            children: children
        };
    },
    generate: function(node) {
        this.children(node);
    }
};

var TYPE$z = tokenizer.TYPE;

var COMMA$3 = TYPE$z.Comma;

var SelectorList = {
    name: 'SelectorList',
    structure: {
        children: [[
            'Selector',
            'Raw'
        ]]
    },
    parse: function() {
        var children = this.createList();

        while (!this.scanner.eof) {
            children.push(this.Selector());

            if (this.scanner.tokenType === COMMA$3) {
                this.scanner.next();
                continue;
            }

            break;
        }

        return {
            type: 'SelectorList',
            loc: this.getLocationFromList(children),
            children: children
        };
    },
    generate: function(node) {
        this.children(node, function() {
            this.chunk(',');
        });
    },
    walkContext: 'selector'
};

var STRING$3 = tokenizer.TYPE.String;

var _String = {
    name: 'String',
    structure: {
        value: String
    },
    parse: function() {
        return {
            type: 'String',
            loc: this.getLocation(this.scanner.tokenStart, this.scanner.tokenEnd),
            value: this.consume(STRING$3)
        };
    },
    generate: function(node) {
        this.chunk(node.value);
    }
};

var TYPE$A = tokenizer.TYPE;

var WHITESPACE$a = TYPE$A.WhiteSpace;
var COMMENT$9 = TYPE$A.Comment;
var ATKEYWORD$2 = TYPE$A.AtKeyword;
var CDO$1 = TYPE$A.CDO;
var CDC$1 = TYPE$A.CDC;
var EXCLAMATIONMARK$2 = 0x0021; // U+0021 EXCLAMATION MARK (!)

function consumeRaw$5(startToken) {
    return this.Raw(startToken, null, false);
}

var StyleSheet = {
    name: 'StyleSheet',
    structure: {
        children: [[
            'Comment',
            'CDO',
            'CDC',
            'Atrule',
            'Rule',
            'Raw'
        ]]
    },
    parse: function() {
        var start = this.scanner.tokenStart;
        var children = this.createList();
        var child;

        
        while (!this.scanner.eof) {
            switch (this.scanner.tokenType) {
                case WHITESPACE$a:
                    this.scanner.next();
                    continue;

                case COMMENT$9:
                    // ignore comments except exclamation comments (i.e. /*! .. */) on top level
                    if (this.scanner.source.charCodeAt(this.scanner.tokenStart + 2) !== EXCLAMATIONMARK$2) {
                        this.scanner.next();
                        continue;
                    }

                    child = this.Comment();
                    break;

                case CDO$1: // <!--
                    child = this.CDO();
                    break;

                case CDC$1: // -->
                    child = this.CDC();
                    break;

                // CSS Syntax Module Level 3
                // §2.2 Error handling
                // At the "top level" of a stylesheet, an <at-keyword-token> starts an at-rule.
                case ATKEYWORD$2:
                    child = this.parseWithFallback(this.Atrule, consumeRaw$5);
                    break;

                // Anything else starts a qualified rule ...
                default:
                    child = this.parseWithFallback(this.Rule, consumeRaw$5);
            }

            children.push(child);
        }

        return {
            type: 'StyleSheet',
            loc: this.getLocation(start, this.scanner.tokenStart),
            children: children
        };
    },
    generate: function(node) {
        this.children(node);
    },
    walkContext: 'stylesheet'
};

var TYPE$B = tokenizer.TYPE;

var IDENT$f = TYPE$B.Ident;
var ASTERISK$5 = 0x002A;     // U+002A ASTERISK (*)
var VERTICALLINE$2 = 0x007C; // U+007C VERTICAL LINE (|)

function eatIdentifierOrAsterisk() {
    if (this.scanner.tokenType !== IDENT$f &&
        this.scanner.isDelim(ASTERISK$5) === false) {
        this.error('Identifier or asterisk is expected');
    }

    this.scanner.next();
}

// ident
// ident|ident
// ident|*
// *
// *|ident
// *|*
// |ident
// |*
var TypeSelector = {
    name: 'TypeSelector',
    structure: {
        name: String
    },
    parse: function() {
        var start = this.scanner.tokenStart;

        if (this.scanner.isDelim(VERTICALLINE$2)) {
            this.scanner.next();
            eatIdentifierOrAsterisk.call(this);
        } else {
            eatIdentifierOrAsterisk.call(this);

            if (this.scanner.isDelim(VERTICALLINE$2)) {
                this.scanner.next();
                eatIdentifierOrAsterisk.call(this);
            }
        }

        return {
            type: 'TypeSelector',
            loc: this.getLocation(start, this.scanner.tokenStart),
            name: this.scanner.substrToCursor(start)
        };
    },
    generate: function(node) {
        this.chunk(node.name);
    }
};

var isHexDigit$3 = tokenizer.isHexDigit;
var cmpChar$3 = tokenizer.cmpChar;
var TYPE$C = tokenizer.TYPE;
var NAME$3 = tokenizer.NAME;

var IDENT$g = TYPE$C.Ident;
var NUMBER$7 = TYPE$C.Number;
var DIMENSION$5 = TYPE$C.Dimension;
var PLUSSIGN$5 = 0x002B;     // U+002B PLUS SIGN (+)
var HYPHENMINUS$3 = 0x002D;  // U+002D HYPHEN-MINUS (-)
var QUESTIONMARK = 0x003F; // U+003F QUESTION MARK (?)
var U$1 = 0x0075;            // U+0075 LATIN SMALL LETTER U (u)

function eatHexSequence(offset, allowDash) {
    for (var pos = this.scanner.tokenStart + offset, len = 0; pos < this.scanner.tokenEnd; pos++) {
        var code = this.scanner.source.charCodeAt(pos);

        if (code === HYPHENMINUS$3 && allowDash && len !== 0) {
            if (eatHexSequence.call(this, offset + len + 1, false) === 0) {
                this.error();
            }

            return -1;
        }

        if (!isHexDigit$3(code)) {
            this.error(
                allowDash && len !== 0
                    ? 'HyphenMinus' + (len < 6 ? ' or hex digit' : '') + ' is expected'
                    : (len < 6 ? 'Hex digit is expected' : 'Unexpected input'),
                pos
            );
        }

        if (++len > 6) {
            this.error('Too many hex digits', pos);
        }    }

    this.scanner.next();
    return len;
}

function eatQuestionMarkSequence(max) {
    var count = 0;

    while (this.scanner.isDelim(QUESTIONMARK)) {
        if (++count > max) {
            this.error('Too many question marks');
        }

        this.scanner.next();
    }
}

function startsWith(code) {
    if (this.scanner.source.charCodeAt(this.scanner.tokenStart) !== code) {
        this.error(NAME$3[code] + ' is expected');
    }
}

// https://drafts.csswg.org/css-syntax/#urange
// Informally, the <urange> production has three forms:
// U+0001
//      Defines a range consisting of a single code point, in this case the code point "1".
// U+0001-00ff
//      Defines a range of codepoints between the first and the second value, in this case
//      the range between "1" and "ff" (255 in decimal) inclusive.
// U+00??
//      Defines a range of codepoints where the "?" characters range over all hex digits,
//      in this case defining the same as the value U+0000-00ff.
// In each form, a maximum of 6 digits is allowed for each hexadecimal number (if you treat "?" as a hexadecimal digit).
//
// <urange> =
//   u '+' <ident-token> '?'* |
//   u <dimension-token> '?'* |
//   u <number-token> '?'* |
//   u <number-token> <dimension-token> |
//   u <number-token> <number-token> |
//   u '+' '?'+
function scanUnicodeRange() {
    var hexLength = 0;

    // u '+' <ident-token> '?'*
    // u '+' '?'+
    if (this.scanner.isDelim(PLUSSIGN$5)) {
        this.scanner.next();

        if (this.scanner.tokenType === IDENT$g) {
            hexLength = eatHexSequence.call(this, 0, true);
            if (hexLength > 0) {
                eatQuestionMarkSequence.call(this, 6 - hexLength);
            }
            return;
        }

        if (this.scanner.isDelim(QUESTIONMARK)) {
            this.scanner.next();
            eatQuestionMarkSequence.call(this, 5);
            return;
        }

        this.error('Hex digit or question mark is expected');
        return;
    }

    // u <number-token> '?'*
    // u <number-token> <dimension-token>
    // u <number-token> <number-token>
    if (this.scanner.tokenType === NUMBER$7) {
        startsWith.call(this, PLUSSIGN$5);
        hexLength = eatHexSequence.call(this, 1, true);

        if (this.scanner.isDelim(QUESTIONMARK)) {
            eatQuestionMarkSequence.call(this, 6 - hexLength);
            return;
        }

        if (this.scanner.tokenType === DIMENSION$5 ||
            this.scanner.tokenType === NUMBER$7) {
            startsWith.call(this, HYPHENMINUS$3);
            eatHexSequence.call(this, 1, false);
            return;
        }

        return;
    }

    // u <dimension-token> '?'*
    if (this.scanner.tokenType === DIMENSION$5) {
        startsWith.call(this, PLUSSIGN$5);
        hexLength = eatHexSequence.call(this, 1, true);

        if (hexLength > 0) {
            eatQuestionMarkSequence.call(this, 6 - hexLength);
        }

        return;
    }

    this.error();
}

var UnicodeRange = {
    name: 'UnicodeRange',
    structure: {
        value: String
    },
    parse: function() {
        var start = this.scanner.tokenStart;

        // U or u
        if (!cmpChar$3(this.scanner.source, start, U$1)) {
            this.error('U is expected');
        }

        if (!cmpChar$3(this.scanner.source, start + 1, PLUSSIGN$5)) {
            this.error('Plus sign is expected');
        }

        this.scanner.next();
        scanUnicodeRange.call(this);

        return {
            type: 'UnicodeRange',
            loc: this.getLocation(start, this.scanner.tokenStart),
            value: this.scanner.substrToCursor(start)
        };
    },
    generate: function(node) {
        this.chunk(node.value);
    }
};

var isWhiteSpace$2 = tokenizer.isWhiteSpace;
var cmpStr$5 = tokenizer.cmpStr;
var TYPE$D = tokenizer.TYPE;

var FUNCTION$6 = TYPE$D.Function;
var URL$4 = TYPE$D.Url;
var RIGHTPARENTHESIS$5 = TYPE$D.RightParenthesis;

// <url-token> | <function-token> <string> )
var Url = {
    name: 'Url',
    structure: {
        value: ['String', 'Raw']
    },
    parse: function() {
        var start = this.scanner.tokenStart;
        var value;

        switch (this.scanner.tokenType) {
            case URL$4:
                var rawStart = start + 4;
                var rawEnd = this.scanner.tokenEnd - 1;

                while (rawStart < rawEnd && isWhiteSpace$2(this.scanner.source.charCodeAt(rawStart))) {
                    rawStart++;
                }

                while (rawStart < rawEnd && isWhiteSpace$2(this.scanner.source.charCodeAt(rawEnd - 1))) {
                    rawEnd--;
                }

                value = {
                    type: 'Raw',
                    loc: this.getLocation(rawStart, rawEnd),
                    value: this.scanner.source.substring(rawStart, rawEnd)
                };

                this.eat(URL$4);
                break;

            case FUNCTION$6:
                if (!cmpStr$5(this.scanner.source, this.scanner.tokenStart, this.scanner.tokenEnd, 'url(')) {
                    this.error('Function name must be `url`');
                }

                this.eat(FUNCTION$6);
                this.scanner.skipSC();
                value = this.String();
                this.scanner.skipSC();
                this.eat(RIGHTPARENTHESIS$5);
                break;

            default:
                this.error('Url or Function is expected');
        }

        return {
            type: 'Url',
            loc: this.getLocation(start, this.scanner.tokenStart),
            value: value
        };
    },
    generate: function(node) {
        this.chunk('url');
        this.chunk('(');
        this.node(node.value);
        this.chunk(')');
    }
};

var Value = {
    name: 'Value',
    structure: {
        children: [[]]
    },
    parse: function() {
        var start = this.scanner.tokenStart;
        var children = this.readSequence(this.scope.Value);

        return {
            type: 'Value',
            loc: this.getLocation(start, this.scanner.tokenStart),
            children: children
        };
    },
    generate: function(node) {
        this.children(node);
    }
};

var WHITESPACE$b = tokenizer.TYPE.WhiteSpace;
var SPACE = Object.freeze({
    type: 'WhiteSpace',
    loc: null,
    value: ' '
});

var WhiteSpace$1 = {
    name: 'WhiteSpace',
    structure: {
        value: String
    },
    parse: function() {
        this.eat(WHITESPACE$b);
        return SPACE;

        // return {
        //     type: 'WhiteSpace',
        //     loc: this.getLocation(this.scanner.tokenStart, this.scanner.tokenEnd),
        //     value: this.consume(WHITESPACE)
        // };
    },
    generate: function(node) {
        this.chunk(node.value);
    }
};

var node = {
    AnPlusB: AnPlusB,
    Atrule: Atrule,
    AtrulePrelude: AtrulePrelude,
    AttributeSelector: AttributeSelector,
    Block: Block,
    Brackets: Brackets,
    CDC: CDC_1,
    CDO: CDO_1,
    ClassSelector: ClassSelector,
    Combinator: Combinator,
    Comment: Comment,
    Declaration: Declaration,
    DeclarationList: DeclarationList,
    Dimension: Dimension,
    Function: _Function,
    Hash: Hash,
    Identifier: Identifier,
    IdSelector: IdSelector,
    MediaFeature: MediaFeature,
    MediaQuery: MediaQuery,
    MediaQueryList: MediaQueryList,
    Nth: Nth,
    Number: _Number,
    Operator: Operator,
    Parentheses: Parentheses,
    Percentage: Percentage,
    PseudoClassSelector: PseudoClassSelector,
    PseudoElementSelector: PseudoElementSelector,
    Ratio: Ratio,
    Raw: Raw,
    Rule: Rule,
    Selector: Selector,
    SelectorList: SelectorList,
    String: _String,
    StyleSheet: StyleSheet,
    TypeSelector: TypeSelector,
    UnicodeRange: UnicodeRange,
    Url: Url,
    Value: Value,
    WhiteSpace: WhiteSpace$1
};

var parser = {
    parseContext: {
        default: 'StyleSheet',
        stylesheet: 'StyleSheet',
        atrule: 'Atrule',
        atrulePrelude: function(options) {
            return this.AtrulePrelude(options.atrule ? String(options.atrule) : null);
        },
        mediaQueryList: 'MediaQueryList',
        mediaQuery: 'MediaQuery',
        rule: 'Rule',
        selectorList: 'SelectorList',
        selector: 'Selector',
        block: function() {
            return this.Block(true);
        },
        declarationList: 'DeclarationList',
        declaration: 'Declaration',
        value: 'Value'
    },
    scope: scope,
    atrule: atrule,
    pseudo: pseudo,
    node: node
};

var parser$1 = create(parser);

function read_style(parser, start, attributes) {
    const content_start = parser.index;
    const styles = parser.read_until(/<\/style>/);
    const content_end = parser.index;
    let ast;
    try {
        ast = parser$1(styles, {
            positions: true,
            offset: content_start,
            onParseError(error) {
                throw error;
            }
        });
    }
    catch (err) {
        if (err.name === 'SyntaxError') {
            parser.error({
                code: 'css-syntax-error',
                message: err.message
            }, err.offset);
        }
        else {
            throw err;
        }
    }
    ast = JSON.parse(JSON.stringify(ast));
    // tidy up AST
    walk(ast, {
        enter: (node) => {
            // replace `ref:a` nodes
            if (node.type === 'Selector') {
                for (let i = 0; i < node.children.length; i += 1) {
                    const a = node.children[i];
                    const b = node.children[i + 1];
                    if (is_ref_selector(a, b)) {
                        parser.error({
                            code: 'invalid-ref-selector',
                            message: 'ref selectors are no longer supported'
                        }, a.loc.start.offset);
                    }
                }
            }
            if (node.type === 'Declaration' && node.value.type === 'Value' && node.value.children.length === 0) {
                parser.error({
                    code: 'invalid-declaration',
                    message: 'Declaration cannot be empty'
                }, node.start);
            }
            if (node.type === 'PseudoClassSelector' && node.name === 'global' && node.children === null) {
                parser.error({
                    code: 'css-syntax-error',
                    message: ':global() must contain a selector'
                }, node.loc.start.offset);
            }
            if (node.loc) {
                node.start = node.loc.start.offset;
                node.end = node.loc.end.offset;
                delete node.loc;
            }
        }
    });
    parser.eat('</style>', true);
    const end = parser.index;
    return {
        type: 'Style',
        start,
        end,
        attributes,
        children: ast.children,
        content: {
            start: content_start,
            end: content_end,
            styles
        }
    };
}
function is_ref_selector(a, b) {
    if (!b)
        return false;
    return (a.type === 'TypeSelector' &&
        a.name === 'ref' &&
        b.type === 'PseudoClassSelector');
}

// https://dev.w3.org/html5/html-author/charref
var entities = {
    CounterClockwiseContourIntegral: 8755,
    ClockwiseContourIntegral: 8754,
    DoubleLongLeftRightArrow: 10234,
    DiacriticalDoubleAcute: 733,
    NotSquareSupersetEqual: 8931,
    CloseCurlyDoubleQuote: 8221,
    DoubleContourIntegral: 8751,
    FilledVerySmallSquare: 9642,
    NegativeVeryThinSpace: 8203,
    NotPrecedesSlantEqual: 8928,
    NotRightTriangleEqual: 8941,
    NotSucceedsSlantEqual: 8929,
    CapitalDifferentialD: 8517,
    DoubleLeftRightArrow: 8660,
    DoubleLongRightArrow: 10233,
    EmptyVerySmallSquare: 9643,
    NestedGreaterGreater: 8811,
    NotDoubleVerticalBar: 8742,
    NotLeftTriangleEqual: 8940,
    NotSquareSubsetEqual: 8930,
    OpenCurlyDoubleQuote: 8220,
    ReverseUpEquilibrium: 10607,
    DoubleLongLeftArrow: 10232,
    DownLeftRightVector: 10576,
    LeftArrowRightArrow: 8646,
    NegativeMediumSpace: 8203,
    RightArrowLeftArrow: 8644,
    SquareSupersetEqual: 8850,
    leftrightsquigarrow: 8621,
    DownRightTeeVector: 10591,
    DownRightVectorBar: 10583,
    LongLeftRightArrow: 10231,
    Longleftrightarrow: 10234,
    NegativeThickSpace: 8203,
    PrecedesSlantEqual: 8828,
    ReverseEquilibrium: 8651,
    RightDoubleBracket: 10215,
    RightDownTeeVector: 10589,
    RightDownVectorBar: 10581,
    RightTriangleEqual: 8885,
    SquareIntersection: 8851,
    SucceedsSlantEqual: 8829,
    blacktriangleright: 9656,
    longleftrightarrow: 10231,
    DoubleUpDownArrow: 8661,
    DoubleVerticalBar: 8741,
    DownLeftTeeVector: 10590,
    DownLeftVectorBar: 10582,
    FilledSmallSquare: 9724,
    GreaterSlantEqual: 10878,
    LeftDoubleBracket: 10214,
    LeftDownTeeVector: 10593,
    LeftDownVectorBar: 10585,
    LeftTriangleEqual: 8884,
    NegativeThinSpace: 8203,
    NotReverseElement: 8716,
    NotTildeFullEqual: 8775,
    RightAngleBracket: 10217,
    RightUpDownVector: 10575,
    SquareSubsetEqual: 8849,
    VerticalSeparator: 10072,
    blacktriangledown: 9662,
    blacktriangleleft: 9666,
    leftrightharpoons: 8651,
    rightleftharpoons: 8652,
    twoheadrightarrow: 8608,
    DiacriticalAcute: 180,
    DiacriticalGrave: 96,
    DiacriticalTilde: 732,
    DoubleRightArrow: 8658,
    DownArrowUpArrow: 8693,
    EmptySmallSquare: 9723,
    GreaterEqualLess: 8923,
    GreaterFullEqual: 8807,
    LeftAngleBracket: 10216,
    LeftUpDownVector: 10577,
    LessEqualGreater: 8922,
    NonBreakingSpace: 160,
    NotRightTriangle: 8939,
    NotSupersetEqual: 8841,
    RightTriangleBar: 10704,
    RightUpTeeVector: 10588,
    RightUpVectorBar: 10580,
    UnderParenthesis: 9181,
    UpArrowDownArrow: 8645,
    circlearrowright: 8635,
    downharpoonright: 8642,
    ntrianglerighteq: 8941,
    rightharpoondown: 8641,
    rightrightarrows: 8649,
    twoheadleftarrow: 8606,
    vartriangleright: 8883,
    CloseCurlyQuote: 8217,
    ContourIntegral: 8750,
    DoubleDownArrow: 8659,
    DoubleLeftArrow: 8656,
    DownRightVector: 8641,
    LeftRightVector: 10574,
    LeftTriangleBar: 10703,
    LeftUpTeeVector: 10592,
    LeftUpVectorBar: 10584,
    LowerRightArrow: 8600,
    NotGreaterEqual: 8817,
    NotGreaterTilde: 8821,
    NotLeftTriangle: 8938,
    OverParenthesis: 9180,
    RightDownVector: 8642,
    ShortRightArrow: 8594,
    UpperRightArrow: 8599,
    bigtriangledown: 9661,
    circlearrowleft: 8634,
    curvearrowright: 8631,
    downharpoonleft: 8643,
    leftharpoondown: 8637,
    leftrightarrows: 8646,
    nLeftrightarrow: 8654,
    nleftrightarrow: 8622,
    ntrianglelefteq: 8940,
    rightleftarrows: 8644,
    rightsquigarrow: 8605,
    rightthreetimes: 8908,
    straightepsilon: 1013,
    trianglerighteq: 8885,
    vartriangleleft: 8882,
    DiacriticalDot: 729,
    DoubleRightTee: 8872,
    DownLeftVector: 8637,
    GreaterGreater: 10914,
    HorizontalLine: 9472,
    InvisibleComma: 8291,
    InvisibleTimes: 8290,
    LeftDownVector: 8643,
    LeftRightArrow: 8596,
    Leftrightarrow: 8660,
    LessSlantEqual: 10877,
    LongRightArrow: 10230,
    Longrightarrow: 10233,
    LowerLeftArrow: 8601,
    NestedLessLess: 8810,
    NotGreaterLess: 8825,
    NotLessGreater: 8824,
    NotSubsetEqual: 8840,
    NotVerticalBar: 8740,
    OpenCurlyQuote: 8216,
    ReverseElement: 8715,
    RightTeeVector: 10587,
    RightVectorBar: 10579,
    ShortDownArrow: 8595,
    ShortLeftArrow: 8592,
    SquareSuperset: 8848,
    TildeFullEqual: 8773,
    UpperLeftArrow: 8598,
    ZeroWidthSpace: 8203,
    curvearrowleft: 8630,
    doublebarwedge: 8966,
    downdownarrows: 8650,
    hookrightarrow: 8618,
    leftleftarrows: 8647,
    leftrightarrow: 8596,
    leftthreetimes: 8907,
    longrightarrow: 10230,
    looparrowright: 8620,
    nshortparallel: 8742,
    ntriangleright: 8939,
    rightarrowtail: 8611,
    rightharpoonup: 8640,
    trianglelefteq: 8884,
    upharpoonright: 8638,
    ApplyFunction: 8289,
    DifferentialD: 8518,
    DoubleLeftTee: 10980,
    DoubleUpArrow: 8657,
    LeftTeeVector: 10586,
    LeftVectorBar: 10578,
    LessFullEqual: 8806,
    LongLeftArrow: 10229,
    Longleftarrow: 10232,
    NotTildeEqual: 8772,
    NotTildeTilde: 8777,
    Poincareplane: 8460,
    PrecedesEqual: 10927,
    PrecedesTilde: 8830,
    RightArrowBar: 8677,
    RightTeeArrow: 8614,
    RightTriangle: 8883,
    RightUpVector: 8638,
    SucceedsEqual: 10928,
    SucceedsTilde: 8831,
    SupersetEqual: 8839,
    UpEquilibrium: 10606,
    VerticalTilde: 8768,
    VeryThinSpace: 8202,
    bigtriangleup: 9651,
    blacktriangle: 9652,
    divideontimes: 8903,
    fallingdotseq: 8786,
    hookleftarrow: 8617,
    leftarrowtail: 8610,
    leftharpoonup: 8636,
    longleftarrow: 10229,
    looparrowleft: 8619,
    measuredangle: 8737,
    ntriangleleft: 8938,
    shortparallel: 8741,
    smallsetminus: 8726,
    triangleright: 9657,
    upharpoonleft: 8639,
    DownArrowBar: 10515,
    DownTeeArrow: 8615,
    ExponentialE: 8519,
    GreaterEqual: 8805,
    GreaterTilde: 8819,
    HilbertSpace: 8459,
    HumpDownHump: 8782,
    Intersection: 8898,
    LeftArrowBar: 8676,
    LeftTeeArrow: 8612,
    LeftTriangle: 8882,
    LeftUpVector: 8639,
    NotCongruent: 8802,
    NotLessEqual: 8816,
    NotLessTilde: 8820,
    Proportional: 8733,
    RightCeiling: 8969,
    RoundImplies: 10608,
    ShortUpArrow: 8593,
    SquareSubset: 8847,
    UnderBracket: 9141,
    VerticalLine: 124,
    blacklozenge: 10731,
    exponentiale: 8519,
    risingdotseq: 8787,
    triangledown: 9663,
    triangleleft: 9667,
    CircleMinus: 8854,
    CircleTimes: 8855,
    Equilibrium: 8652,
    GreaterLess: 8823,
    LeftCeiling: 8968,
    LessGreater: 8822,
    MediumSpace: 8287,
    NotPrecedes: 8832,
    NotSucceeds: 8833,
    OverBracket: 9140,
    RightVector: 8640,
    Rrightarrow: 8667,
    RuleDelayed: 10740,
    SmallCircle: 8728,
    SquareUnion: 8852,
    SubsetEqual: 8838,
    UpDownArrow: 8597,
    Updownarrow: 8661,
    VerticalBar: 8739,
    backepsilon: 1014,
    blacksquare: 9642,
    circledcirc: 8858,
    circleddash: 8861,
    curlyeqprec: 8926,
    curlyeqsucc: 8927,
    diamondsuit: 9830,
    eqslantless: 10901,
    expectation: 8496,
    nRightarrow: 8655,
    nrightarrow: 8603,
    preccurlyeq: 8828,
    precnapprox: 10937,
    quaternions: 8461,
    straightphi: 981,
    succcurlyeq: 8829,
    succnapprox: 10938,
    thickapprox: 8776,
    updownarrow: 8597,
    Bernoullis: 8492,
    CirclePlus: 8853,
    EqualTilde: 8770,
    Fouriertrf: 8497,
    ImaginaryI: 8520,
    Laplacetrf: 8466,
    LeftVector: 8636,
    Lleftarrow: 8666,
    NotElement: 8713,
    NotGreater: 8815,
    Proportion: 8759,
    RightArrow: 8594,
    RightFloor: 8971,
    Rightarrow: 8658,
    TildeEqual: 8771,
    TildeTilde: 8776,
    UnderBrace: 9183,
    UpArrowBar: 10514,
    UpTeeArrow: 8613,
    circledast: 8859,
    complement: 8705,
    curlywedge: 8911,
    eqslantgtr: 10902,
    gtreqqless: 10892,
    lessapprox: 10885,
    lesseqqgtr: 10891,
    lmoustache: 9136,
    longmapsto: 10236,
    mapstodown: 8615,
    mapstoleft: 8612,
    nLeftarrow: 8653,
    nleftarrow: 8602,
    precapprox: 10935,
    rightarrow: 8594,
    rmoustache: 9137,
    sqsubseteq: 8849,
    sqsupseteq: 8850,
    subsetneqq: 10955,
    succapprox: 10936,
    supsetneqq: 10956,
    upuparrows: 8648,
    varepsilon: 949,
    varnothing: 8709,
    Backslash: 8726,
    CenterDot: 183,
    CircleDot: 8857,
    Congruent: 8801,
    Coproduct: 8720,
    DoubleDot: 168,
    DownArrow: 8595,
    DownBreve: 785,
    Downarrow: 8659,
    HumpEqual: 8783,
    LeftArrow: 8592,
    LeftFloor: 8970,
    Leftarrow: 8656,
    LessTilde: 8818,
    Mellintrf: 8499,
    MinusPlus: 8723,
    NotCupCap: 8813,
    NotExists: 8708,
    OverBrace: 9182,
    PlusMinus: 177,
    Therefore: 8756,
    ThinSpace: 8201,
    TripleDot: 8411,
    UnionPlus: 8846,
    backprime: 8245,
    backsimeq: 8909,
    bigotimes: 10754,
    centerdot: 183,
    checkmark: 10003,
    complexes: 8450,
    dotsquare: 8865,
    downarrow: 8595,
    gtrapprox: 10886,
    gtreqless: 8923,
    heartsuit: 9829,
    leftarrow: 8592,
    lesseqgtr: 8922,
    nparallel: 8742,
    nshortmid: 8740,
    nsubseteq: 8840,
    nsupseteq: 8841,
    pitchfork: 8916,
    rationals: 8474,
    spadesuit: 9824,
    subseteqq: 10949,
    subsetneq: 8842,
    supseteqq: 10950,
    supsetneq: 8843,
    therefore: 8756,
    triangleq: 8796,
    varpropto: 8733,
    DDotrahd: 10513,
    DotEqual: 8784,
    Integral: 8747,
    LessLess: 10913,
    NotEqual: 8800,
    NotTilde: 8769,
    PartialD: 8706,
    Precedes: 8826,
    RightTee: 8866,
    Succeeds: 8827,
    SuchThat: 8715,
    Superset: 8835,
    Uarrocir: 10569,
    UnderBar: 818,
    andslope: 10840,
    angmsdaa: 10664,
    angmsdab: 10665,
    angmsdac: 10666,
    angmsdad: 10667,
    angmsdae: 10668,
    angmsdaf: 10669,
    angmsdag: 10670,
    angmsdah: 10671,
    angrtvbd: 10653,
    approxeq: 8778,
    awconint: 8755,
    backcong: 8780,
    barwedge: 8965,
    bbrktbrk: 9142,
    bigoplus: 10753,
    bigsqcup: 10758,
    biguplus: 10756,
    bigwedge: 8896,
    boxminus: 8863,
    boxtimes: 8864,
    capbrcup: 10825,
    circledR: 174,
    circledS: 9416,
    cirfnint: 10768,
    clubsuit: 9827,
    cupbrcap: 10824,
    curlyvee: 8910,
    cwconint: 8754,
    doteqdot: 8785,
    dotminus: 8760,
    drbkarow: 10512,
    dzigrarr: 10239,
    elinters: 9191,
    emptyset: 8709,
    eqvparsl: 10725,
    fpartint: 10765,
    geqslant: 10878,
    gesdotol: 10884,
    gnapprox: 10890,
    hksearow: 10533,
    hkswarow: 10534,
    imagline: 8464,
    imagpart: 8465,
    infintie: 10717,
    integers: 8484,
    intercal: 8890,
    intlarhk: 10775,
    laemptyv: 10676,
    ldrushar: 10571,
    leqslant: 10877,
    lesdotor: 10883,
    llcorner: 8990,
    lnapprox: 10889,
    lrcorner: 8991,
    lurdshar: 10570,
    mapstoup: 8613,
    multimap: 8888,
    naturals: 8469,
    otimesas: 10806,
    parallel: 8741,
    plusacir: 10787,
    pointint: 10773,
    precneqq: 10933,
    precnsim: 8936,
    profalar: 9006,
    profline: 8978,
    profsurf: 8979,
    raemptyv: 10675,
    realpart: 8476,
    rppolint: 10770,
    rtriltri: 10702,
    scpolint: 10771,
    setminus: 8726,
    shortmid: 8739,
    smeparsl: 10724,
    sqsubset: 8847,
    sqsupset: 8848,
    subseteq: 8838,
    succneqq: 10934,
    succnsim: 8937,
    supseteq: 8839,
    thetasym: 977,
    thicksim: 8764,
    timesbar: 10801,
    triangle: 9653,
    triminus: 10810,
    trpezium: 9186,
    ulcorner: 8988,
    urcorner: 8989,
    varkappa: 1008,
    varsigma: 962,
    vartheta: 977,
    Because: 8757,
    Cayleys: 8493,
    Cconint: 8752,
    Cedilla: 184,
    Diamond: 8900,
    DownTee: 8868,
    Element: 8712,
    Epsilon: 917,
    Implies: 8658,
    LeftTee: 8867,
    NewLine: 10,
    NoBreak: 8288,
    NotLess: 8814,
    Omicron: 927,
    OverBar: 175,
    Product: 8719,
    UpArrow: 8593,
    Uparrow: 8657,
    Upsilon: 933,
    alefsym: 8501,
    angrtvb: 8894,
    angzarr: 9084,
    asympeq: 8781,
    backsim: 8765,
    because: 8757,
    bemptyv: 10672,
    between: 8812,
    bigcirc: 9711,
    bigodot: 10752,
    bigstar: 9733,
    boxplus: 8862,
    ccupssm: 10832,
    cemptyv: 10674,
    cirscir: 10690,
    coloneq: 8788,
    congdot: 10861,
    cudarrl: 10552,
    cudarrr: 10549,
    cularrp: 10557,
    curarrm: 10556,
    dbkarow: 10511,
    ddagger: 8225,
    ddotseq: 10871,
    demptyv: 10673,
    diamond: 8900,
    digamma: 989,
    dotplus: 8724,
    dwangle: 10662,
    epsilon: 949,
    eqcolon: 8789,
    equivDD: 10872,
    gesdoto: 10882,
    gtquest: 10876,
    gtrless: 8823,
    harrcir: 10568,
    intprod: 10812,
    isindot: 8949,
    larrbfs: 10527,
    larrsim: 10611,
    lbrksld: 10639,
    lbrkslu: 10637,
    ldrdhar: 10599,
    lesdoto: 10881,
    lessdot: 8918,
    lessgtr: 8822,
    lesssim: 8818,
    lotimes: 10804,
    lozenge: 9674,
    ltquest: 10875,
    luruhar: 10598,
    maltese: 10016,
    minusdu: 10794,
    napprox: 8777,
    natural: 9838,
    nearrow: 8599,
    nexists: 8708,
    notinva: 8713,
    notinvb: 8951,
    notinvc: 8950,
    notniva: 8716,
    notnivb: 8958,
    notnivc: 8957,
    npolint: 10772,
    nsqsube: 8930,
    nsqsupe: 8931,
    nvinfin: 10718,
    nwarrow: 8598,
    olcross: 10683,
    omicron: 959,
    orderof: 8500,
    orslope: 10839,
    pertenk: 8241,
    planckh: 8462,
    pluscir: 10786,
    plussim: 10790,
    plustwo: 10791,
    precsim: 8830,
    quatint: 10774,
    questeq: 8799,
    rarrbfs: 10528,
    rarrsim: 10612,
    rbrksld: 10638,
    rbrkslu: 10640,
    rdldhar: 10601,
    realine: 8475,
    rotimes: 10805,
    ruluhar: 10600,
    searrow: 8600,
    simplus: 10788,
    simrarr: 10610,
    subedot: 10947,
    submult: 10945,
    subplus: 10943,
    subrarr: 10617,
    succsim: 8831,
    supdsub: 10968,
    supedot: 10948,
    suphsub: 10967,
    suplarr: 10619,
    supmult: 10946,
    supplus: 10944,
    swarrow: 8601,
    topfork: 10970,
    triplus: 10809,
    tritime: 10811,
    uparrow: 8593,
    upsilon: 965,
    uwangle: 10663,
    vzigzag: 10650,
    zigrarr: 8669,
    Aacute: 193,
    Abreve: 258,
    Agrave: 192,
    Assign: 8788,
    Atilde: 195,
    Barwed: 8966,
    Bumpeq: 8782,
    Cacute: 262,
    Ccaron: 268,
    Ccedil: 199,
    Colone: 10868,
    Conint: 8751,
    CupCap: 8781,
    Dagger: 8225,
    Dcaron: 270,
    DotDot: 8412,
    Dstrok: 272,
    Eacute: 201,
    Ecaron: 282,
    Egrave: 200,
    Exists: 8707,
    ForAll: 8704,
    Gammad: 988,
    Gbreve: 286,
    Gcedil: 290,
    HARDcy: 1066,
    Hstrok: 294,
    Iacute: 205,
    Igrave: 204,
    Itilde: 296,
    Jsercy: 1032,
    Kcedil: 310,
    Lacute: 313,
    Lambda: 923,
    Lcaron: 317,
    Lcedil: 315,
    Lmidot: 319,
    Lstrok: 321,
    Nacute: 323,
    Ncaron: 327,
    Ncedil: 325,
    Ntilde: 209,
    Oacute: 211,
    Odblac: 336,
    Ograve: 210,
    Oslash: 216,
    Otilde: 213,
    Otimes: 10807,
    Racute: 340,
    Rarrtl: 10518,
    Rcaron: 344,
    Rcedil: 342,
    SHCHcy: 1065,
    SOFTcy: 1068,
    Sacute: 346,
    Scaron: 352,
    Scedil: 350,
    Square: 9633,
    Subset: 8912,
    Supset: 8913,
    Tcaron: 356,
    Tcedil: 354,
    Tstrok: 358,
    Uacute: 218,
    Ubreve: 364,
    Udblac: 368,
    Ugrave: 217,
    Utilde: 360,
    Vdashl: 10982,
    Verbar: 8214,
    Vvdash: 8874,
    Yacute: 221,
    Zacute: 377,
    Zcaron: 381,
    aacute: 225,
    abreve: 259,
    agrave: 224,
    andand: 10837,
    angmsd: 8737,
    angsph: 8738,
    apacir: 10863,
    approx: 8776,
    atilde: 227,
    barvee: 8893,
    barwed: 8965,
    becaus: 8757,
    bernou: 8492,
    bigcap: 8898,
    bigcup: 8899,
    bigvee: 8897,
    bkarow: 10509,
    bottom: 8869,
    bowtie: 8904,
    boxbox: 10697,
    bprime: 8245,
    brvbar: 166,
    bullet: 8226,
    bumpeq: 8783,
    cacute: 263,
    capand: 10820,
    capcap: 10827,
    capcup: 10823,
    capdot: 10816,
    ccaron: 269,
    ccedil: 231,
    circeq: 8791,
    cirmid: 10991,
    colone: 8788,
    commat: 64,
    compfn: 8728,
    conint: 8750,
    coprod: 8720,
    copysr: 8471,
    cularr: 8630,
    cupcap: 10822,
    cupcup: 10826,
    cupdot: 8845,
    curarr: 8631,
    curren: 164,
    cylcty: 9005,
    dagger: 8224,
    daleth: 8504,
    dcaron: 271,
    dfisht: 10623,
    divide: 247,
    divonx: 8903,
    dlcorn: 8990,
    dlcrop: 8973,
    dollar: 36,
    drcorn: 8991,
    drcrop: 8972,
    dstrok: 273,
    eacute: 233,
    easter: 10862,
    ecaron: 283,
    ecolon: 8789,
    egrave: 232,
    egsdot: 10904,
    elsdot: 10903,
    emptyv: 8709,
    emsp13: 8196,
    emsp14: 8197,
    eparsl: 10723,
    eqcirc: 8790,
    equals: 61,
    equest: 8799,
    female: 9792,
    ffilig: 64259,
    ffllig: 64260,
    forall: 8704,
    frac12: 189,
    frac13: 8531,
    frac14: 188,
    frac15: 8533,
    frac16: 8537,
    frac18: 8539,
    frac23: 8532,
    frac25: 8534,
    frac34: 190,
    frac35: 8535,
    frac38: 8540,
    frac45: 8536,
    frac56: 8538,
    frac58: 8541,
    frac78: 8542,
    gacute: 501,
    gammad: 989,
    gbreve: 287,
    gesdot: 10880,
    gesles: 10900,
    gtlPar: 10645,
    gtrarr: 10616,
    gtrdot: 8919,
    gtrsim: 8819,
    hairsp: 8202,
    hamilt: 8459,
    hardcy: 1098,
    hearts: 9829,
    hellip: 8230,
    hercon: 8889,
    homtht: 8763,
    horbar: 8213,
    hslash: 8463,
    hstrok: 295,
    hybull: 8259,
    hyphen: 8208,
    iacute: 237,
    igrave: 236,
    iiiint: 10764,
    iinfin: 10716,
    incare: 8453,
    inodot: 305,
    intcal: 8890,
    iquest: 191,
    isinsv: 8947,
    itilde: 297,
    jsercy: 1112,
    kappav: 1008,
    kcedil: 311,
    kgreen: 312,
    lAtail: 10523,
    lacute: 314,
    lagran: 8466,
    lambda: 955,
    langle: 10216,
    larrfs: 10525,
    larrhk: 8617,
    larrlp: 8619,
    larrpl: 10553,
    larrtl: 8610,
    latail: 10521,
    lbrace: 123,
    lbrack: 91,
    lcaron: 318,
    lcedil: 316,
    ldquor: 8222,
    lesdot: 10879,
    lesges: 10899,
    lfisht: 10620,
    lfloor: 8970,
    lharul: 10602,
    llhard: 10603,
    lmidot: 320,
    lmoust: 9136,
    loplus: 10797,
    lowast: 8727,
    lowbar: 95,
    lparlt: 10643,
    lrhard: 10605,
    lsaquo: 8249,
    lsquor: 8218,
    lstrok: 322,
    lthree: 8907,
    ltimes: 8905,
    ltlarr: 10614,
    ltrPar: 10646,
    mapsto: 8614,
    marker: 9646,
    mcomma: 10793,
    midast: 42,
    midcir: 10992,
    middot: 183,
    minusb: 8863,
    minusd: 8760,
    mnplus: 8723,
    models: 8871,
    mstpos: 8766,
    nVDash: 8879,
    nVdash: 8878,
    nacute: 324,
    ncaron: 328,
    ncedil: 326,
    nearhk: 10532,
    nequiv: 8802,
    nesear: 10536,
    nexist: 8708,
    nltrie: 8940,
    nprcue: 8928,
    nrtrie: 8941,
    nsccue: 8929,
    nsimeq: 8772,
    ntilde: 241,
    numero: 8470,
    nvDash: 8877,
    nvHarr: 10500,
    nvdash: 8876,
    nvlArr: 10498,
    nvrArr: 10499,
    nwarhk: 10531,
    nwnear: 10535,
    oacute: 243,
    odblac: 337,
    odsold: 10684,
    ograve: 242,
    ominus: 8854,
    origof: 8886,
    oslash: 248,
    otilde: 245,
    otimes: 8855,
    parsim: 10995,
    percnt: 37,
    period: 46,
    permil: 8240,
    phmmat: 8499,
    planck: 8463,
    plankv: 8463,
    plusdo: 8724,
    plusdu: 10789,
    plusmn: 177,
    preceq: 10927,
    primes: 8473,
    prnsim: 8936,
    propto: 8733,
    prurel: 8880,
    puncsp: 8200,
    qprime: 8279,
    rAtail: 10524,
    racute: 341,
    rangle: 10217,
    rarrap: 10613,
    rarrfs: 10526,
    rarrhk: 8618,
    rarrlp: 8620,
    rarrpl: 10565,
    rarrtl: 8611,
    ratail: 10522,
    rbrace: 125,
    rbrack: 93,
    rcaron: 345,
    rcedil: 343,
    rdquor: 8221,
    rfisht: 10621,
    rfloor: 8971,
    rharul: 10604,
    rmoust: 9137,
    roplus: 10798,
    rpargt: 10644,
    rsaquo: 8250,
    rsquor: 8217,
    rthree: 8908,
    rtimes: 8906,
    sacute: 347,
    scaron: 353,
    scedil: 351,
    scnsim: 8937,
    searhk: 10533,
    seswar: 10537,
    sfrown: 8994,
    shchcy: 1097,
    sigmaf: 962,
    sigmav: 962,
    simdot: 10858,
    smashp: 10803,
    softcy: 1100,
    solbar: 9023,
    spades: 9824,
    sqsube: 8849,
    sqsupe: 8850,
    square: 9633,
    squarf: 9642,
    ssetmn: 8726,
    ssmile: 8995,
    sstarf: 8902,
    subdot: 10941,
    subset: 8834,
    subsim: 10951,
    subsub: 10965,
    subsup: 10963,
    succeq: 10928,
    supdot: 10942,
    supset: 8835,
    supsim: 10952,
    supsub: 10964,
    supsup: 10966,
    swarhk: 10534,
    swnwar: 10538,
    target: 8982,
    tcaron: 357,
    tcedil: 355,
    telrec: 8981,
    there4: 8756,
    thetav: 977,
    thinsp: 8201,
    thksim: 8764,
    timesb: 8864,
    timesd: 10800,
    topbot: 9014,
    topcir: 10993,
    tprime: 8244,
    tridot: 9708,
    tstrok: 359,
    uacute: 250,
    ubreve: 365,
    udblac: 369,
    ufisht: 10622,
    ugrave: 249,
    ulcorn: 8988,
    ulcrop: 8975,
    urcorn: 8989,
    urcrop: 8974,
    utilde: 361,
    vangrt: 10652,
    varphi: 966,
    varrho: 1009,
    veebar: 8891,
    vellip: 8942,
    verbar: 124,
    wedbar: 10847,
    wedgeq: 8793,
    weierp: 8472,
    wreath: 8768,
    xoplus: 10753,
    xotime: 10754,
    xsqcup: 10758,
    xuplus: 10756,
    xwedge: 8896,
    yacute: 253,
    zacute: 378,
    zcaron: 382,
    zeetrf: 8488,
    AElig: 198,
    Acirc: 194,
    Alpha: 913,
    Amacr: 256,
    Aogon: 260,
    Aring: 197,
    Breve: 728,
    Ccirc: 264,
    Colon: 8759,
    Cross: 10799,
    Dashv: 10980,
    Delta: 916,
    Ecirc: 202,
    Emacr: 274,
    Eogon: 280,
    Equal: 10869,
    Gamma: 915,
    Gcirc: 284,
    Hacek: 711,
    Hcirc: 292,
    IJlig: 306,
    Icirc: 206,
    Imacr: 298,
    Iogon: 302,
    Iukcy: 1030,
    Jcirc: 308,
    Jukcy: 1028,
    Kappa: 922,
    OElig: 338,
    Ocirc: 212,
    Omacr: 332,
    Omega: 937,
    Prime: 8243,
    RBarr: 10512,
    Scirc: 348,
    Sigma: 931,
    THORN: 222,
    TRADE: 8482,
    TSHcy: 1035,
    Theta: 920,
    Tilde: 8764,
    Ubrcy: 1038,
    Ucirc: 219,
    Umacr: 362,
    Union: 8899,
    Uogon: 370,
    UpTee: 8869,
    Uring: 366,
    VDash: 8875,
    Vdash: 8873,
    Wcirc: 372,
    Wedge: 8896,
    Ycirc: 374,
    acirc: 226,
    acute: 180,
    aelig: 230,
    aleph: 8501,
    alpha: 945,
    amacr: 257,
    amalg: 10815,
    angle: 8736,
    angrt: 8735,
    angst: 8491,
    aogon: 261,
    aring: 229,
    asymp: 8776,
    awint: 10769,
    bcong: 8780,
    bdquo: 8222,
    bepsi: 1014,
    blank: 9251,
    blk12: 9618,
    blk14: 9617,
    blk34: 9619,
    block: 9608,
    boxDL: 9559,
    boxDR: 9556,
    boxDl: 9558,
    boxDr: 9555,
    boxHD: 9574,
    boxHU: 9577,
    boxHd: 9572,
    boxHu: 9575,
    boxUL: 9565,
    boxUR: 9562,
    boxUl: 9564,
    boxUr: 9561,
    boxVH: 9580,
    boxVL: 9571,
    boxVR: 9568,
    boxVh: 9579,
    boxVl: 9570,
    boxVr: 9567,
    boxdL: 9557,
    boxdR: 9554,
    boxdl: 9488,
    boxdr: 9484,
    boxhD: 9573,
    boxhU: 9576,
    boxhd: 9516,
    boxhu: 9524,
    boxuL: 9563,
    boxuR: 9560,
    boxul: 9496,
    boxur: 9492,
    boxvH: 9578,
    boxvL: 9569,
    boxvR: 9566,
    boxvh: 9532,
    boxvl: 9508,
    boxvr: 9500,
    breve: 728,
    bsemi: 8271,
    bsime: 8909,
    bsolb: 10693,
    bumpE: 10926,
    bumpe: 8783,
    caret: 8257,
    caron: 711,
    ccaps: 10829,
    ccirc: 265,
    ccups: 10828,
    cedil: 184,
    check: 10003,
    clubs: 9827,
    colon: 58,
    comma: 44,
    crarr: 8629,
    cross: 10007,
    csube: 10961,
    csupe: 10962,
    ctdot: 8943,
    cuepr: 8926,
    cuesc: 8927,
    cupor: 10821,
    cuvee: 8910,
    cuwed: 8911,
    cwint: 8753,
    dashv: 8867,
    dblac: 733,
    ddarr: 8650,
    delta: 948,
    dharl: 8643,
    dharr: 8642,
    diams: 9830,
    disin: 8946,
    doteq: 8784,
    dtdot: 8945,
    dtrif: 9662,
    duarr: 8693,
    duhar: 10607,
    eDDot: 10871,
    ecirc: 234,
    efDot: 8786,
    emacr: 275,
    empty: 8709,
    eogon: 281,
    eplus: 10865,
    epsiv: 949,
    eqsim: 8770,
    equiv: 8801,
    erDot: 8787,
    erarr: 10609,
    esdot: 8784,
    exist: 8707,
    fflig: 64256,
    filig: 64257,
    fllig: 64258,
    fltns: 9649,
    forkv: 10969,
    frasl: 8260,
    frown: 8994,
    gamma: 947,
    gcirc: 285,
    gescc: 10921,
    gimel: 8503,
    gneqq: 8809,
    gnsim: 8935,
    grave: 96,
    gsime: 10894,
    gsiml: 10896,
    gtcir: 10874,
    gtdot: 8919,
    harrw: 8621,
    hcirc: 293,
    hoarr: 8703,
    icirc: 238,
    iexcl: 161,
    iiint: 8749,
    iiota: 8489,
    ijlig: 307,
    imacr: 299,
    image: 8465,
    imath: 305,
    imped: 437,
    infin: 8734,
    iogon: 303,
    iprod: 10812,
    isinE: 8953,
    isins: 8948,
    isinv: 8712,
    iukcy: 1110,
    jcirc: 309,
    jmath: 567,
    jukcy: 1108,
    kappa: 954,
    lAarr: 8666,
    lBarr: 10510,
    langd: 10641,
    laquo: 171,
    larrb: 8676,
    lbarr: 10508,
    lbbrk: 10098,
    lbrke: 10635,
    lceil: 8968,
    ldquo: 8220,
    lescc: 10920,
    lhard: 8637,
    lharu: 8636,
    lhblk: 9604,
    llarr: 8647,
    lltri: 9722,
    lneqq: 8808,
    lnsim: 8934,
    loang: 10220,
    loarr: 8701,
    lobrk: 10214,
    lopar: 10629,
    lrarr: 8646,
    lrhar: 8651,
    lrtri: 8895,
    lsime: 10893,
    lsimg: 10895,
    lsquo: 8216,
    ltcir: 10873,
    ltdot: 8918,
    ltrie: 8884,
    ltrif: 9666,
    mDDot: 8762,
    mdash: 8212,
    micro: 181,
    minus: 8722,
    mumap: 8888,
    nabla: 8711,
    napos: 329,
    natur: 9838,
    ncong: 8775,
    ndash: 8211,
    neArr: 8663,
    nearr: 8599,
    ngsim: 8821,
    nhArr: 8654,
    nharr: 8622,
    nhpar: 10994,
    nlArr: 8653,
    nlarr: 8602,
    nless: 8814,
    nlsim: 8820,
    nltri: 8938,
    notin: 8713,
    notni: 8716,
    nprec: 8832,
    nrArr: 8655,
    nrarr: 8603,
    nrtri: 8939,
    nsime: 8772,
    nsmid: 8740,
    nspar: 8742,
    nsube: 8840,
    nsucc: 8833,
    nsupe: 8841,
    numsp: 8199,
    nwArr: 8662,
    nwarr: 8598,
    ocirc: 244,
    odash: 8861,
    oelig: 339,
    ofcir: 10687,
    ohbar: 10677,
    olarr: 8634,
    olcir: 10686,
    oline: 8254,
    omacr: 333,
    omega: 969,
    operp: 10681,
    oplus: 8853,
    orarr: 8635,
    order: 8500,
    ovbar: 9021,
    parsl: 11005,
    phone: 9742,
    plusb: 8862,
    pluse: 10866,
    pound: 163,
    prcue: 8828,
    prime: 8242,
    prnap: 10937,
    prsim: 8830,
    quest: 63,
    rAarr: 8667,
    rBarr: 10511,
    radic: 8730,
    rangd: 10642,
    range: 10661,
    raquo: 187,
    rarrb: 8677,
    rarrc: 10547,
    rarrw: 8605,
    ratio: 8758,
    rbarr: 10509,
    rbbrk: 10099,
    rbrke: 10636,
    rceil: 8969,
    rdquo: 8221,
    reals: 8477,
    rhard: 8641,
    rharu: 8640,
    rlarr: 8644,
    rlhar: 8652,
    rnmid: 10990,
    roang: 10221,
    roarr: 8702,
    robrk: 10215,
    ropar: 10630,
    rrarr: 8649,
    rsquo: 8217,
    rtrie: 8885,
    rtrif: 9656,
    sbquo: 8218,
    sccue: 8829,
    scirc: 349,
    scnap: 10938,
    scsim: 8831,
    sdotb: 8865,
    sdote: 10854,
    seArr: 8664,
    searr: 8600,
    setmn: 8726,
    sharp: 9839,
    sigma: 963,
    simeq: 8771,
    simgE: 10912,
    simlE: 10911,
    simne: 8774,
    slarr: 8592,
    smile: 8995,
    sqcap: 8851,
    sqcup: 8852,
    sqsub: 8847,
    sqsup: 8848,
    srarr: 8594,
    starf: 9733,
    strns: 175,
    subnE: 10955,
    subne: 8842,
    supnE: 10956,
    supne: 8843,
    swArr: 8665,
    swarr: 8601,
    szlig: 223,
    theta: 952,
    thkap: 8776,
    thorn: 254,
    tilde: 732,
    times: 215,
    trade: 8482,
    trisb: 10701,
    tshcy: 1115,
    twixt: 8812,
    ubrcy: 1118,
    ucirc: 251,
    udarr: 8645,
    udhar: 10606,
    uharl: 8639,
    uharr: 8638,
    uhblk: 9600,
    ultri: 9720,
    umacr: 363,
    uogon: 371,
    uplus: 8846,
    upsih: 978,
    uring: 367,
    urtri: 9721,
    utdot: 8944,
    utrif: 9652,
    uuarr: 8648,
    vBarv: 10985,
    vDash: 8872,
    varpi: 982,
    vdash: 8866,
    veeeq: 8794,
    vltri: 8882,
    vprop: 8733,
    vrtri: 8883,
    wcirc: 373,
    wedge: 8743,
    xcirc: 9711,
    xdtri: 9661,
    xhArr: 10234,
    xharr: 10231,
    xlArr: 10232,
    xlarr: 10229,
    xodot: 10752,
    xrArr: 10233,
    xrarr: 10230,
    xutri: 9651,
    ycirc: 375,
    Aopf: 120120,
    Ascr: 119964,
    Auml: 196,
    Barv: 10983,
    Beta: 914,
    Bopf: 120121,
    Bscr: 8492,
    CHcy: 1063,
    COPY: 169,
    Cdot: 266,
    Copf: 8450,
    Cscr: 119966,
    DJcy: 1026,
    DScy: 1029,
    DZcy: 1039,
    Darr: 8609,
    Dopf: 120123,
    Dscr: 119967,
    Edot: 278,
    Eopf: 120124,
    Escr: 8496,
    Esim: 10867,
    Euml: 203,
    Fopf: 120125,
    Fscr: 8497,
    GJcy: 1027,
    Gdot: 288,
    Gopf: 120126,
    Gscr: 119970,
    Hopf: 8461,
    Hscr: 8459,
    IEcy: 1045,
    IOcy: 1025,
    Idot: 304,
    Iopf: 120128,
    Iota: 921,
    Iscr: 8464,
    Iuml: 207,
    Jopf: 120129,
    Jscr: 119973,
    KHcy: 1061,
    KJcy: 1036,
    Kopf: 120130,
    Kscr: 119974,
    LJcy: 1033,
    Lang: 10218,
    Larr: 8606,
    Lopf: 120131,
    Lscr: 8466,
    Mopf: 120132,
    Mscr: 8499,
    NJcy: 1034,
    Nopf: 8469,
    Nscr: 119977,
    Oopf: 120134,
    Oscr: 119978,
    Ouml: 214,
    Popf: 8473,
    Pscr: 119979,
    QUOT: 34,
    Qopf: 8474,
    Qscr: 119980,
    Rang: 10219,
    Rarr: 8608,
    Ropf: 8477,
    Rscr: 8475,
    SHcy: 1064,
    Sopf: 120138,
    Sqrt: 8730,
    Sscr: 119982,
    Star: 8902,
    TScy: 1062,
    Topf: 120139,
    Tscr: 119983,
    Uarr: 8607,
    Uopf: 120140,
    Upsi: 978,
    Uscr: 119984,
    Uuml: 220,
    Vbar: 10987,
    Vert: 8214,
    Vopf: 120141,
    Vscr: 119985,
    Wopf: 120142,
    Wscr: 119986,
    Xopf: 120143,
    Xscr: 119987,
    YAcy: 1071,
    YIcy: 1031,
    YUcy: 1070,
    Yopf: 120144,
    Yscr: 119988,
    Yuml: 376,
    ZHcy: 1046,
    Zdot: 379,
    Zeta: 918,
    Zopf: 8484,
    Zscr: 119989,
    andd: 10844,
    andv: 10842,
    ange: 10660,
    aopf: 120146,
    apid: 8779,
    apos: 39,
    ascr: 119990,
    auml: 228,
    bNot: 10989,
    bbrk: 9141,
    beta: 946,
    beth: 8502,
    bnot: 8976,
    bopf: 120147,
    boxH: 9552,
    boxV: 9553,
    boxh: 9472,
    boxv: 9474,
    bscr: 119991,
    bsim: 8765,
    bsol: 92,
    bull: 8226,
    bump: 8782,
    cdot: 267,
    cent: 162,
    chcy: 1095,
    cirE: 10691,
    circ: 710,
    cire: 8791,
    comp: 8705,
    cong: 8773,
    copf: 120148,
    copy: 169,
    cscr: 119992,
    csub: 10959,
    csup: 10960,
    dArr: 8659,
    dHar: 10597,
    darr: 8595,
    dash: 8208,
    diam: 8900,
    djcy: 1106,
    dopf: 120149,
    dscr: 119993,
    dscy: 1109,
    dsol: 10742,
    dtri: 9663,
    dzcy: 1119,
    eDot: 8785,
    ecir: 8790,
    edot: 279,
    emsp: 8195,
    ensp: 8194,
    eopf: 120150,
    epar: 8917,
    epsi: 1013,
    escr: 8495,
    esim: 8770,
    euml: 235,
    euro: 8364,
    excl: 33,
    flat: 9837,
    fnof: 402,
    fopf: 120151,
    fork: 8916,
    fscr: 119995,
    gdot: 289,
    geqq: 8807,
    gjcy: 1107,
    gnap: 10890,
    gneq: 10888,
    gopf: 120152,
    gscr: 8458,
    gsim: 8819,
    gtcc: 10919,
    hArr: 8660,
    half: 189,
    harr: 8596,
    hbar: 8463,
    hopf: 120153,
    hscr: 119997,
    iecy: 1077,
    imof: 8887,
    iocy: 1105,
    iopf: 120154,
    iota: 953,
    iscr: 119998,
    isin: 8712,
    iuml: 239,
    jopf: 120155,
    jscr: 119999,
    khcy: 1093,
    kjcy: 1116,
    kopf: 120156,
    kscr: 120000,
    lArr: 8656,
    lHar: 10594,
    lang: 10216,
    larr: 8592,
    late: 10925,
    lcub: 123,
    ldca: 10550,
    ldsh: 8626,
    leqq: 8806,
    ljcy: 1113,
    lnap: 10889,
    lneq: 10887,
    lopf: 120157,
    lozf: 10731,
    lpar: 40,
    lscr: 120001,
    lsim: 8818,
    lsqb: 91,
    ltcc: 10918,
    ltri: 9667,
    macr: 175,
    male: 9794,
    malt: 10016,
    mlcp: 10971,
    mldr: 8230,
    mopf: 120158,
    mscr: 120002,
    nbsp: 160,
    ncap: 10819,
    ncup: 10818,
    ngeq: 8817,
    ngtr: 8815,
    nisd: 8954,
    njcy: 1114,
    nldr: 8229,
    nleq: 8816,
    nmid: 8740,
    nopf: 120159,
    npar: 8742,
    nscr: 120003,
    nsim: 8769,
    nsub: 8836,
    nsup: 8837,
    ntgl: 8825,
    ntlg: 8824,
    oast: 8859,
    ocir: 8858,
    odiv: 10808,
    odot: 8857,
    ogon: 731,
    oint: 8750,
    omid: 10678,
    oopf: 120160,
    opar: 10679,
    ordf: 170,
    ordm: 186,
    oror: 10838,
    oscr: 8500,
    osol: 8856,
    ouml: 246,
    para: 182,
    part: 8706,
    perp: 8869,
    phiv: 966,
    plus: 43,
    popf: 120161,
    prap: 10935,
    prec: 8826,
    prnE: 10933,
    prod: 8719,
    prop: 8733,
    pscr: 120005,
    qint: 10764,
    qopf: 120162,
    qscr: 120006,
    quot: 34,
    rArr: 8658,
    rHar: 10596,
    race: 10714,
    rang: 10217,
    rarr: 8594,
    rcub: 125,
    rdca: 10551,
    rdsh: 8627,
    real: 8476,
    rect: 9645,
    rhov: 1009,
    ring: 730,
    ropf: 120163,
    rpar: 41,
    rscr: 120007,
    rsqb: 93,
    rtri: 9657,
    scap: 10936,
    scnE: 10934,
    sdot: 8901,
    sect: 167,
    semi: 59,
    sext: 10038,
    shcy: 1096,
    sime: 8771,
    simg: 10910,
    siml: 10909,
    smid: 8739,
    smte: 10924,
    solb: 10692,
    sopf: 120164,
    spar: 8741,
    squf: 9642,
    sscr: 120008,
    star: 9734,
    subE: 10949,
    sube: 8838,
    succ: 8827,
    sung: 9834,
    sup1: 185,
    sup2: 178,
    sup3: 179,
    supE: 10950,
    supe: 8839,
    tbrk: 9140,
    tdot: 8411,
    tint: 8749,
    toea: 10536,
    topf: 120165,
    tosa: 10537,
    trie: 8796,
    tscr: 120009,
    tscy: 1094,
    uArr: 8657,
    uHar: 10595,
    uarr: 8593,
    uopf: 120166,
    upsi: 965,
    uscr: 120010,
    utri: 9653,
    uuml: 252,
    vArr: 8661,
    vBar: 10984,
    varr: 8597,
    vert: 124,
    vopf: 120167,
    vscr: 120011,
    wopf: 120168,
    wscr: 120012,
    xcap: 8898,
    xcup: 8899,
    xmap: 10236,
    xnis: 8955,
    xopf: 120169,
    xscr: 120013,
    xvee: 8897,
    yacy: 1103,
    yicy: 1111,
    yopf: 120170,
    yscr: 120014,
    yucy: 1102,
    yuml: 255,
    zdot: 380,
    zeta: 950,
    zhcy: 1078,
    zopf: 120171,
    zscr: 120015,
    zwnj: 8204,
    AMP: 38,
    Acy: 1040,
    Afr: 120068,
    And: 10835,
    Bcy: 1041,
    Bfr: 120069,
    Cap: 8914,
    Cfr: 8493,
    Chi: 935,
    Cup: 8915,
    Dcy: 1044,
    Del: 8711,
    Dfr: 120071,
    Dot: 168,
    ENG: 330,
    ETH: 208,
    Ecy: 1069,
    Efr: 120072,
    Eta: 919,
    Fcy: 1060,
    Ffr: 120073,
    Gcy: 1043,
    Gfr: 120074,
    Hat: 94,
    Hfr: 8460,
    Icy: 1048,
    Ifr: 8465,
    Int: 8748,
    Jcy: 1049,
    Jfr: 120077,
    Kcy: 1050,
    Kfr: 120078,
    Lcy: 1051,
    Lfr: 120079,
    Lsh: 8624,
    Map: 10501,
    Mcy: 1052,
    Mfr: 120080,
    Ncy: 1053,
    Nfr: 120081,
    Not: 10988,
    Ocy: 1054,
    Ofr: 120082,
    Pcy: 1055,
    Pfr: 120083,
    Phi: 934,
    Psi: 936,
    Qfr: 120084,
    REG: 174,
    Rcy: 1056,
    Rfr: 8476,
    Rho: 929,
    Rsh: 8625,
    Scy: 1057,
    Sfr: 120086,
    Sub: 8912,
    Sum: 8721,
    Sup: 8913,
    Tab: 9,
    Tau: 932,
    Tcy: 1058,
    Tfr: 120087,
    Ucy: 1059,
    Ufr: 120088,
    Vcy: 1042,
    Vee: 8897,
    Vfr: 120089,
    Wfr: 120090,
    Xfr: 120091,
    Ycy: 1067,
    Yfr: 120092,
    Zcy: 1047,
    Zfr: 8488,
    acd: 8767,
    acy: 1072,
    afr: 120094,
    amp: 38,
    and: 8743,
    ang: 8736,
    apE: 10864,
    ape: 8778,
    ast: 42,
    bcy: 1073,
    bfr: 120095,
    bot: 8869,
    cap: 8745,
    cfr: 120096,
    chi: 967,
    cir: 9675,
    cup: 8746,
    dcy: 1076,
    deg: 176,
    dfr: 120097,
    die: 168,
    div: 247,
    dot: 729,
    ecy: 1101,
    efr: 120098,
    egs: 10902,
    ell: 8467,
    els: 10901,
    eng: 331,
    eta: 951,
    eth: 240,
    fcy: 1092,
    ffr: 120099,
    gEl: 10892,
    gap: 10886,
    gcy: 1075,
    gel: 8923,
    geq: 8805,
    ges: 10878,
    gfr: 120100,
    ggg: 8921,
    glE: 10898,
    gla: 10917,
    glj: 10916,
    gnE: 8809,
    gne: 10888,
    hfr: 120101,
    icy: 1080,
    iff: 8660,
    ifr: 120102,
    int: 8747,
    jcy: 1081,
    jfr: 120103,
    kcy: 1082,
    kfr: 120104,
    lEg: 10891,
    lap: 10885,
    lat: 10923,
    lcy: 1083,
    leg: 8922,
    leq: 8804,
    les: 10877,
    lfr: 120105,
    lgE: 10897,
    lnE: 8808,
    lne: 10887,
    loz: 9674,
    lrm: 8206,
    lsh: 8624,
    map: 8614,
    mcy: 1084,
    mfr: 120106,
    mho: 8487,
    mid: 8739,
    nap: 8777,
    ncy: 1085,
    nfr: 120107,
    nge: 8817,
    ngt: 8815,
    nis: 8956,
    niv: 8715,
    nle: 8816,
    nlt: 8814,
    not: 172,
    npr: 8832,
    nsc: 8833,
    num: 35,
    ocy: 1086,
    ofr: 120108,
    ogt: 10689,
    ohm: 8486,
    olt: 10688,
    ord: 10845,
    orv: 10843,
    par: 8741,
    pcy: 1087,
    pfr: 120109,
    phi: 966,
    piv: 982,
    prE: 10931,
    pre: 10927,
    psi: 968,
    qfr: 120110,
    rcy: 1088,
    reg: 174,
    rfr: 120111,
    rho: 961,
    rlm: 8207,
    rsh: 8625,
    scE: 10932,
    sce: 10928,
    scy: 1089,
    sfr: 120112,
    shy: 173,
    sim: 8764,
    smt: 10922,
    sol: 47,
    squ: 9633,
    sub: 8834,
    sum: 8721,
    sup: 8835,
    tau: 964,
    tcy: 1090,
    tfr: 120113,
    top: 8868,
    ucy: 1091,
    ufr: 120114,
    uml: 168,
    vcy: 1074,
    vee: 8744,
    vfr: 120115,
    wfr: 120116,
    xfr: 120117,
    ycy: 1099,
    yen: 165,
    yfr: 120118,
    zcy: 1079,
    zfr: 120119,
    zwj: 8205,
    DD: 8517,
    GT: 62,
    Gg: 8921,
    Gt: 8811,
    Im: 8465,
    LT: 60,
    Ll: 8920,
    Lt: 8810,
    Mu: 924,
    Nu: 925,
    Or: 10836,
    Pi: 928,
    Pr: 10939,
    Re: 8476,
    Sc: 10940,
    Xi: 926,
    ac: 8766,
    af: 8289,
    ap: 8776,
    dd: 8518,
    ee: 8519,
    eg: 10906,
    el: 10905,
    gE: 8807,
    ge: 8805,
    gg: 8811,
    gl: 8823,
    gt: 62,
    ic: 8291,
    ii: 8520,
    in: 8712,
    it: 8290,
    lE: 8806,
    le: 8804,
    lg: 8822,
    ll: 8810,
    lt: 60,
    mp: 8723,
    mu: 956,
    ne: 8800,
    ni: 8715,
    nu: 957,
    oS: 9416,
    or: 8744,
    pi: 960,
    pm: 177,
    pr: 8826,
    rx: 8478,
    sc: 8827,
    wp: 8472,
    wr: 8768,
    xi: 958
};

const windows_1252 = [
    8364,
    129,
    8218,
    402,
    8222,
    8230,
    8224,
    8225,
    710,
    8240,
    352,
    8249,
    338,
    141,
    381,
    143,
    144,
    8216,
    8217,
    8220,
    8221,
    8226,
    8211,
    8212,
    732,
    8482,
    353,
    8250,
    339,
    157,
    382,
    376
];
const entity_pattern = new RegExp(`&(#?(?:x[\\w\\d]+|\\d+|${Object.keys(entities).join('|')}))(?:;|\\b)`, 'g');
function decode_character_references(html) {
    return html.replace(entity_pattern, (match, entity) => {
        let code;
        // Handle named entities
        if (entity[0] !== '#') {
            code = entities[entity];
        }
        else if (entity[1] === 'x') {
            code = parseInt(entity.substring(2), 16);
        }
        else {
            code = parseInt(entity.substring(1), 10);
        }
        if (!code) {
            return match;
        }
        return String.fromCodePoint(validate_code(code));
    });
}
const NUL = 0;
// some code points are verboten. If we were inserting HTML, the browser would replace the illegal
// code points with alternatives in some cases - since we're bypassing that mechanism, we need
// to replace them ourselves
//
// Source: http://en.wikipedia.org/wiki/Character_encodings_in_HTML#Illegal_characters
function validate_code(code) {
    // line feed becomes generic whitespace
    if (code === 10) {
        return 32;
    }
    // ASCII range. (Why someone would use HTML entities for ASCII characters I don't know, but...)
    if (code < 128) {
        return code;
    }
    // code points 128-159 are dealt with leniently by browsers, but they're incorrect. We need
    // to correct the mistake or we'll end up with missing € signs and so on
    if (code <= 159) {
        return windows_1252[code - 128];
    }
    // basic multilingual plane
    if (code < 55296) {
        return code;
    }
    // UTF-16 surrogate halves
    if (code <= 57343) {
        return NUL;
    }
    // rest of the basic multilingual plane
    if (code <= 65535) {
        return code;
    }
    // supplementary multilingual plane 0x10000 - 0x1ffff
    if (code >= 65536 && code <= 131071) {
        return code;
    }
    // supplementary ideographic plane 0x20000 - 0x2ffff
    if (code >= 131072 && code <= 196607) {
        return code;
    }
    return NUL;
}
// based on http://developers.whatwg.org/syntax.html#syntax-tag-omission
const disallowed_contents = new Map([
    ['li', new Set(['li'])],
    ['dt', new Set(['dt', 'dd'])],
    ['dd', new Set(['dt', 'dd'])],
    [
        'p',
        new Set('address article aside blockquote div dl fieldset footer form h1 h2 h3 h4 h5 h6 header hgroup hr main menu nav ol p pre section table ul'.split(' '))
    ],
    ['rt', new Set(['rt', 'rp'])],
    ['rp', new Set(['rt', 'rp'])],
    ['optgroup', new Set(['optgroup'])],
    ['option', new Set(['option', 'optgroup'])],
    ['thead', new Set(['tbody', 'tfoot'])],
    ['tbody', new Set(['tbody', 'tfoot'])],
    ['tfoot', new Set(['tbody'])],
    ['tr', new Set(['tr', 'tbody'])],
    ['td', new Set(['td', 'th', 'tr'])],
    ['th', new Set(['td', 'th', 'tr'])]
]);
// can this be a child of the parent element, or does it implicitly
// close it, like `<li>one<li>two`?
function closing_tag_omitted(current, next) {
    if (disallowed_contents.has(current)) {
        if (!next || disallowed_contents.get(current).has(next)) {
            return true;
        }
    }
    return false;
}

// Adapted from https://github.com/acornjs/acorn/blob/6584815dca7440e00de841d1dad152302fdd7ca5/src/tokenize.js
// Reproduced under MIT License https://github.com/acornjs/acorn/blob/master/LICENSE
function full_char_code_at(str, i) {
    const code = str.charCodeAt(i);
    if (code <= 0xd7ff || code >= 0xe000)
        return code;
    const next = str.charCodeAt(i + 1);
    return (code << 10) + next - 0x35fdc00;
}

const globals = new Set([
    'alert',
    'Array',
    'Boolean',
    'clearInterval',
    'clearTimeout',
    'confirm',
    'console',
    'Date',
    'decodeURI',
    'decodeURIComponent',
    'document',
    'Element',
    'encodeURI',
    'encodeURIComponent',
    'Error',
    'EvalError',
    'Event',
    'EventSource',
    'fetch',
    'global',
    'globalThis',
    'history',
    'Infinity',
    'InternalError',
    'Intl',
    'isFinite',
    'isNaN',
    'JSON',
    'localStorage',
    'location',
    'Map',
    'Math',
    'NaN',
    'navigator',
    'Number',
    'Node',
    'Object',
    'parseFloat',
    'parseInt',
    'process',
    'Promise',
    'prompt',
    'RangeError',
    'ReferenceError',
    'RegExp',
    'sessionStorage',
    'Set',
    'setInterval',
    'setTimeout',
    'String',
    'SyntaxError',
    'TypeError',
    'undefined',
    'URIError',
    'URL',
    'window'
]);
const reserved = new Set([
    'arguments',
    'await',
    'break',
    'case',
    'catch',
    'class',
    'const',
    'continue',
    'debugger',
    'default',
    'delete',
    'do',
    'else',
    'enum',
    'eval',
    'export',
    'extends',
    'false',
    'finally',
    'for',
    'function',
    'if',
    'implements',
    'import',
    'in',
    'instanceof',
    'interface',
    'let',
    'new',
    'null',
    'package',
    'private',
    'protected',
    'public',
    'return',
    'static',
    'super',
    'switch',
    'this',
    'throw',
    'true',
    'try',
    'typeof',
    'var',
    'void',
    'while',
    'with',
    'yield'
]);
const void_element_names = /^(?:area|base|br|col|command|embed|hr|img|input|keygen|link|meta|param|source|track|wbr)$/;
function is_void(name) {
    return void_element_names.test(name) || name.toLowerCase() === '!doctype';
}
function is_valid(str) {
    let i = 0;
    while (i < str.length) {
        const code = full_char_code_at(str, i);
        if (!(i === 0 ? isIdentifierStart : isIdentifierChar)(code, true))
            return false;
        i += code <= 0xffff ? 1 : 2;
    }
    return true;
}
function sanitize(name) {
    return name
        .replace(/[^a-zA-Z0-9_]+/g, '_')
        .replace(/^_/, '')
        .replace(/_$/, '')
        .replace(/^[0-9]/, '_$&');
}

function fuzzymatch(name, names) {
    const set = new FuzzySet(names);
    const matches = set.get(name);
    return matches && matches[0] && matches[0][0] > 0.7 ? matches[0][1] : null;
}
// adapted from https://github.com/Glench/fuzzyset.js/blob/master/lib/fuzzyset.js
// BSD Licensed
const GRAM_SIZE_LOWER = 2;
const GRAM_SIZE_UPPER = 3;
// return an edit distance from 0 to 1
function _distance(str1, str2) {
    if (str1 === null && str2 === null) {
        throw 'Trying to compare two null values';
    }
    if (str1 === null || str2 === null)
        return 0;
    str1 = String(str1);
    str2 = String(str2);
    const distance = levenshtein(str1, str2);
    if (str1.length > str2.length) {
        return 1 - distance / str1.length;
    }
    else {
        return 1 - distance / str2.length;
    }
}
// helper functions
function levenshtein(str1, str2) {
    const current = [];
    let prev;
    let value;
    for (let i = 0; i <= str2.length; i++) {
        for (let j = 0; j <= str1.length; j++) {
            if (i && j) {
                if (str1.charAt(j - 1) === str2.charAt(i - 1)) {
                    value = prev;
                }
                else {
                    value = Math.min(current[j], current[j - 1], prev) + 1;
                }
            }
            else {
                value = i + j;
            }
            prev = current[j];
            current[j] = value;
        }
    }
    return current.pop();
}
const non_word_regex = /[^\w, ]+/;
function iterate_grams(value, gram_size = 2) {
    const simplified = '-' + value.toLowerCase().replace(non_word_regex, '') + '-';
    const len_diff = gram_size - simplified.length;
    const results = [];
    if (len_diff > 0) {
        for (let i = 0; i < len_diff; ++i) {
            value += '-';
        }
    }
    for (let i = 0; i < simplified.length - gram_size + 1; ++i) {
        results.push(simplified.slice(i, i + gram_size));
    }
    return results;
}
function gram_counter(value, gram_size = 2) {
    // return an object where key=gram, value=number of occurrences
    const result = {};
    const grams = iterate_grams(value, gram_size);
    let i = 0;
    for (i; i < grams.length; ++i) {
        if (grams[i] in result) {
            result[grams[i]] += 1;
        }
        else {
            result[grams[i]] = 1;
        }
    }
    return result;
}
function sort_descending(a, b) {
    return b[0] - a[0];
}
class FuzzySet {
    constructor(arr) {
        this.exact_set = {};
        this.match_dict = {};
        this.items = {};
        // initialization
        for (let i = GRAM_SIZE_LOWER; i < GRAM_SIZE_UPPER + 1; ++i) {
            this.items[i] = [];
        }
        // add all the items to the set
        for (let i = 0; i < arr.length; ++i) {
            this.add(arr[i]);
        }
    }
    add(value) {
        const normalized_value = value.toLowerCase();
        if (normalized_value in this.exact_set) {
            return false;
        }
        let i = GRAM_SIZE_LOWER;
        for (i; i < GRAM_SIZE_UPPER + 1; ++i) {
            this._add(value, i);
        }
    }
    _add(value, gram_size) {
        const normalized_value = value.toLowerCase();
        const items = this.items[gram_size] || [];
        const index = items.length;
        items.push(0);
        const gram_counts = gram_counter(normalized_value, gram_size);
        let sum_of_square_gram_counts = 0;
        let gram;
        let gram_count;
        for (gram in gram_counts) {
            gram_count = gram_counts[gram];
            sum_of_square_gram_counts += Math.pow(gram_count, 2);
            if (gram in this.match_dict) {
                this.match_dict[gram].push([index, gram_count]);
            }
            else {
                this.match_dict[gram] = [[index, gram_count]];
            }
        }
        const vector_normal = Math.sqrt(sum_of_square_gram_counts);
        items[index] = [vector_normal, normalized_value];
        this.items[gram_size] = items;
        this.exact_set[normalized_value] = value;
    }
    get(value) {
        const normalized_value = value.toLowerCase();
        const result = this.exact_set[normalized_value];
        if (result) {
            return [[1, result]];
        }
        let results = [];
        // start with high gram size and if there are no results, go to lower gram sizes
        for (let gram_size = GRAM_SIZE_UPPER; gram_size >= GRAM_SIZE_LOWER; --gram_size) {
            results = this.__get(value, gram_size);
            if (results) {
                return results;
            }
        }
        return null;
    }
    __get(value, gram_size) {
        const normalized_value = value.toLowerCase();
        const matches = {};
        const gram_counts = gram_counter(normalized_value, gram_size);
        const items = this.items[gram_size];
        let sum_of_square_gram_counts = 0;
        let gram;
        let gram_count;
        let i;
        let index;
        let other_gram_count;
        for (gram in gram_counts) {
            gram_count = gram_counts[gram];
            sum_of_square_gram_counts += Math.pow(gram_count, 2);
            if (gram in this.match_dict) {
                for (i = 0; i < this.match_dict[gram].length; ++i) {
                    index = this.match_dict[gram][i][0];
                    other_gram_count = this.match_dict[gram][i][1];
                    if (index in matches) {
                        matches[index] += gram_count * other_gram_count;
                    }
                    else {
                        matches[index] = gram_count * other_gram_count;
                    }
                }
            }
        }
        const vector_normal = Math.sqrt(sum_of_square_gram_counts);
        let results = [];
        let match_score;
        // build a results list of [score, str]
        for (const match_index in matches) {
            match_score = matches[match_index];
            results.push([
                match_score / (vector_normal * items[match_index][0]),
                items[match_index][1]
            ]);
        }
        results.sort(sort_descending);
        let new_results = [];
        const end_index = Math.min(50, results.length);
        // truncate somewhat arbitrarily to 50
        for (let i = 0; i < end_index; ++i) {
            new_results.push([
                _distance(results[i][1], normalized_value),
                results[i][1]
            ]);
        }
        results = new_results;
        results.sort(sort_descending);
        new_results = [];
        for (let i = 0; i < results.length; ++i) {
            if (results[i][0] == results[0][0]) {
                new_results.push([results[i][0], this.exact_set[results[i][1]]]);
            }
        }
        return new_results;
    }
}

function list(items, conjunction = 'or') {
    if (items.length === 1)
        return items[0];
    return `${items.slice(0, -1).join(', ')} ${conjunction} ${items[items.length - 1]}`;
}

// eslint-disable-next-line no-useless-escape
const valid_tag_name = /^\!?[a-zA-Z]{1,}:?[a-zA-Z0-9\-]*/;
const meta_tags = new Map([
    ['svelte:head', 'Head'],
    ['svelte:options', 'Options'],
    ['svelte:window', 'Window'],
    ['svelte:body', 'Body']
]);
const valid_meta_tags = Array.from(meta_tags.keys()).concat('svelte:self', 'svelte:component', 'svelte:fragment');
const specials = new Map([
    [
        'script',
        {
            read: read_script,
            property: 'js'
        }
    ],
    [
        'style',
        {
            read: read_style,
            property: 'css'
        }
    ]
]);
const SELF = /^svelte:self(?=[\s/>])/;
const COMPONENT = /^svelte:component(?=[\s/>])/;
const SLOT = /^svelte:fragment(?=[\s/>])/;
function parent_is_head(stack) {
    let i = stack.length;
    while (i--) {
        const { type } = stack[i];
        if (type === 'Head')
            return true;
        if (type === 'Element' || type === 'InlineComponent')
            return false;
    }
    return false;
}
function tag(parser) {
    const start = parser.index++;
    let parent = parser.current();
    if (parser.eat('!--')) {
        const data = parser.read_until(/-->/);
        parser.eat('-->', true, 'comment was left open, expected -->');
        parser.current().children.push({
            start,
            end: parser.index,
            type: 'Comment',
            data
        });
        return;
    }
    const is_closing_tag = parser.eat('/');
    const name = read_tag_name(parser);
    if (meta_tags.has(name)) {
        const slug = meta_tags.get(name).toLowerCase();
        if (is_closing_tag) {
            if ((name === 'svelte:window' || name === 'svelte:body') &&
                parser.current().children.length) {
                parser.error({
                    code: `invalid-${slug}-content`,
                    message: `<${name}> cannot have children`
                }, parser.current().children[0].start);
            }
        }
        else {
            if (name in parser.meta_tags) {
                parser.error({
                    code: `duplicate-${slug}`,
                    message: `A component can only have one <${name}> tag`
                }, start);
            }
            if (parser.stack.length > 1) {
                parser.error({
                    code: `invalid-${slug}-placement`,
                    message: `<${name}> tags cannot be inside elements or blocks`
                }, start);
            }
            parser.meta_tags[name] = true;
        }
    }
    const type = meta_tags.has(name)
        ? meta_tags.get(name)
        : (/[A-Z]/.test(name[0]) || name === 'svelte:self' || name === 'svelte:component') ? 'InlineComponent'
            : name === 'svelte:fragment' ? 'SlotTemplate'
                : name === 'title' && parent_is_head(parser.stack) ? 'Title'
                    : name === 'slot' && !parser.customElement ? 'Slot' : 'Element';
    const element = {
        start,
        end: null,
        type,
        name,
        attributes: [],
        children: []
    };
    parser.allow_whitespace();
    if (is_closing_tag) {
        if (is_void(name)) {
            parser.error({
                code: 'invalid-void-content',
                message: `<${name}> is a void element and cannot have children, or a closing tag`
            }, start);
        }
        parser.eat('>', true);
        // close any elements that don't have their own closing tags, e.g. <div><p></div>
        while (parent.name !== name) {
            if (parent.type !== 'Element') {
                const message = parser.last_auto_closed_tag && parser.last_auto_closed_tag.tag === name
                    ? `</${name}> attempted to close <${name}> that was already automatically closed by <${parser.last_auto_closed_tag.reason}>`
                    : `</${name}> attempted to close an element that was not open`;
                parser.error({
                    code: 'invalid-closing-tag',
                    message
                }, start);
            }
            parent.end = start;
            parser.stack.pop();
            parent = parser.current();
        }
        parent.end = parser.index;
        parser.stack.pop();
        if (parser.last_auto_closed_tag && parser.stack.length < parser.last_auto_closed_tag.depth) {
            parser.last_auto_closed_tag = null;
        }
        return;
    }
    else if (closing_tag_omitted(parent.name, name)) {
        parent.end = start;
        parser.stack.pop();
        parser.last_auto_closed_tag = {
            tag: parent.name,
            reason: name,
            depth: parser.stack.length
        };
    }
    const unique_names = new Set();
    let attribute;
    while ((attribute = read_attribute(parser, unique_names))) {
        element.attributes.push(attribute);
        parser.allow_whitespace();
    }
    if (name === 'svelte:component') {
        const index = element.attributes.findIndex(attr => attr.type === 'Attribute' && attr.name === 'this');
        if (!~index) {
            parser.error({
                code: 'missing-component-definition',
                message: "<svelte:component> must have a 'this' attribute"
            }, start);
        }
        const definition = element.attributes.splice(index, 1)[0];
        if (definition.value === true || definition.value.length !== 1 || definition.value[0].type === 'Text') {
            parser.error({
                code: 'invalid-component-definition',
                message: 'invalid component definition'
            }, definition.start);
        }
        element.expression = definition.value[0].expression;
    }
    // special cases – top-level <script> and <style>
    if (specials.has(name) && parser.stack.length === 1) {
        const special = specials.get(name);
        parser.eat('>', true);
        const content = special.read(parser, start, element.attributes);
        if (content)
            parser[special.property].push(content);
        return;
    }
    parser.current().children.push(element);
    const self_closing = parser.eat('/') || is_void(name);
    parser.eat('>', true);
    if (self_closing) {
        // don't push self-closing elements onto the stack
        element.end = parser.index;
    }
    else if (name === 'textarea') {
        // special case
        element.children = read_sequence(parser, () => parser.template.slice(parser.index, parser.index + 11) === '</textarea>');
        parser.read(/<\/textarea>/);
        element.end = parser.index;
    }
    else if (name === 'script' || name === 'style') {
        // special case
        const start = parser.index;
        const data = parser.read_until(new RegExp(`</${name}>`));
        const end = parser.index;
        element.children.push({ start, end, type: 'Text', data });
        parser.eat(`</${name}>`, true);
        element.end = parser.index;
    }
    else {
        parser.stack.push(element);
    }
}
function read_tag_name(parser) {
    const start = parser.index;
    if (parser.read(SELF)) {
        // check we're inside a block, otherwise this
        // will cause infinite recursion
        let i = parser.stack.length;
        let legal = false;
        while (i--) {
            const fragment = parser.stack[i];
            if (fragment.type === 'IfBlock' || fragment.type === 'EachBlock' || fragment.type === 'InlineComponent') {
                legal = true;
                break;
            }
        }
        if (!legal) {
            parser.error({
                code: 'invalid-self-placement',
                message: '<svelte:self> components can only exist inside {#if} blocks, {#each} blocks, or slots passed to components'
            }, start);
        }
        return 'svelte:self';
    }
    if (parser.read(COMPONENT))
        return 'svelte:component';
    if (parser.read(SLOT))
        return 'svelte:fragment';
    const name = parser.read_until(/(\s|\/|>)/);
    if (meta_tags.has(name))
        return name;
    if (name.startsWith('svelte:')) {
        const match = fuzzymatch(name.slice(7), valid_meta_tags);
        let message = `Valid <svelte:...> tag names are ${list(valid_meta_tags)}`;
        if (match)
            message += ` (did you mean '${match}'?)`;
        parser.error({
            code: 'invalid-tag-name',
            message
        }, start);
    }
    if (!valid_tag_name.test(name)) {
        parser.error({
            code: 'invalid-tag-name',
            message: 'Expected valid tag name'
        }, start);
    }
    return name;
}
function read_attribute(parser, unique_names) {
    const start = parser.index;
    function check_unique(name) {
        if (unique_names.has(name)) {
            parser.error({
                code: 'duplicate-attribute',
                message: 'Attributes need to be unique'
            }, start);
        }
        unique_names.add(name);
    }
    if (parser.eat('{')) {
        parser.allow_whitespace();
        if (parser.eat('...')) {
            const expression = read_expression(parser);
            parser.allow_whitespace();
            parser.eat('}', true);
            return {
                start,
                end: parser.index,
                type: 'Spread',
                expression
            };
        }
        else {
            const value_start = parser.index;
            const name = parser.read_identifier();
            parser.allow_whitespace();
            parser.eat('}', true);
            check_unique(name);
            return {
                start,
                end: parser.index,
                type: 'Attribute',
                name,
                value: [{
                        start: value_start,
                        end: value_start + name.length,
                        type: 'AttributeShorthand',
                        expression: {
                            start: value_start,
                            end: value_start + name.length,
                            type: 'Identifier',
                            name
                        }
                    }]
            };
        }
    }
    // eslint-disable-next-line no-useless-escape
    const name = parser.read_until(/[\s=\/>"']/);
    if (!name)
        return null;
    let end = parser.index;
    parser.allow_whitespace();
    const colon_index = name.indexOf(':');
    const type = colon_index !== -1 && get_directive_type(name.slice(0, colon_index));
    let value = true;
    if (parser.eat('=')) {
        parser.allow_whitespace();
        value = read_attribute_value(parser);
        end = parser.index;
    }
    else if (parser.match_regex(/["']/)) {
        parser.error({
            code: 'unexpected-token',
            message: 'Expected ='
        }, parser.index);
    }
    if (type) {
        const [directive_name, ...modifiers] = name.slice(colon_index + 1).split('|');
        if (type === 'Binding' && directive_name !== 'this') {
            check_unique(directive_name);
        }
        else if (type !== 'EventHandler' && type !== 'Action') {
            check_unique(name);
        }
        if (type === 'Ref') {
            parser.error({
                code: 'invalid-ref-directive',
                message: `The ref directive is no longer supported — use \`bind:this={${directive_name}}\` instead`
            }, start);
        }
        if (type === 'Class' && directive_name === '') {
            parser.error({
                code: 'invalid-class-directive',
                message: 'Class binding name cannot be empty'
            }, start + colon_index + 1);
        }
        if (value[0]) {
            if (value.length > 1 || value[0].type === 'Text') {
                parser.error({
                    code: 'invalid-directive-value',
                    message: 'Directive value must be a JavaScript expression enclosed in curly braces'
                }, value[0].start);
            }
        }
        const directive = {
            start,
            end,
            type,
            name: directive_name,
            modifiers,
            expression: (value[0] && value[0].expression) || null
        };
        if (type === 'Transition') {
            const direction = name.slice(0, colon_index);
            directive.intro = direction === 'in' || direction === 'transition';
            directive.outro = direction === 'out' || direction === 'transition';
        }
        if (!directive.expression && (type === 'Binding' || type === 'Class')) {
            directive.expression = {
                start: directive.start + colon_index + 1,
                end: directive.end,
                type: 'Identifier',
                name: directive.name
            };
        }
        return directive;
    }
    check_unique(name);
    return {
        start,
        end,
        type: 'Attribute',
        name,
        value
    };
}
function get_directive_type(name) {
    if (name === 'use')
        return 'Action';
    if (name === 'animate')
        return 'Animation';
    if (name === 'bind')
        return 'Binding';
    if (name === 'class')
        return 'Class';
    if (name === 'on')
        return 'EventHandler';
    if (name === 'let')
        return 'Let';
    if (name === 'ref')
        return 'Ref';
    if (name === 'in' || name === 'out' || name === 'transition')
        return 'Transition';
}
function read_attribute_value(parser) {
    const quote_mark = parser.eat("'") ? "'" : parser.eat('"') ? '"' : null;
    const regex = (quote_mark === "'" ? /'/ :
        quote_mark === '"' ? /"/ :
            /(\/>|[\s"'=<>`])/);
    const value = read_sequence(parser, () => !!parser.match_regex(regex));
    if (quote_mark)
        parser.index += 1;
    return value;
}
function read_sequence(parser, done) {
    let current_chunk = {
        start: parser.index,
        end: null,
        type: 'Text',
        raw: '',
        data: null
    };
    function flush() {
        if (current_chunk.raw) {
            current_chunk.data = decode_character_references(current_chunk.raw);
            current_chunk.end = parser.index;
            chunks.push(current_chunk);
        }
    }
    const chunks = [];
    while (parser.index < parser.template.length) {
        const index = parser.index;
        if (done()) {
            flush();
            return chunks;
        }
        else if (parser.eat('{')) {
            flush();
            parser.allow_whitespace();
            const expression = read_expression(parser);
            parser.allow_whitespace();
            parser.eat('}', true);
            chunks.push({
                start: index,
                end: parser.index,
                type: 'MustacheTag',
                expression
            });
            current_chunk = {
                start: parser.index,
                end: null,
                type: 'Text',
                raw: '',
                data: null
            };
        }
        else {
            current_chunk.raw += parser.template[parser.index++];
        }
    }
    parser.error({
        code: 'unexpected-eof',
        message: 'Unexpected end of input'
    });
}

const SQUARE_BRACKET_OPEN = '['.charCodeAt(0);
const SQUARE_BRACKET_CLOSE = ']'.charCodeAt(0);
const CURLY_BRACKET_OPEN = '{'.charCodeAt(0);
const CURLY_BRACKET_CLOSE = '}'.charCodeAt(0);
function is_bracket_open(code) {
    return code === SQUARE_BRACKET_OPEN || code === CURLY_BRACKET_OPEN;
}
function is_bracket_close(code) {
    return code === SQUARE_BRACKET_CLOSE || code === CURLY_BRACKET_CLOSE;
}
function is_bracket_pair(open, close) {
    return ((open === SQUARE_BRACKET_OPEN && close === SQUARE_BRACKET_CLOSE) ||
        (open === CURLY_BRACKET_OPEN && close === CURLY_BRACKET_CLOSE));
}
function get_bracket_close(open) {
    if (open === SQUARE_BRACKET_OPEN) {
        return SQUARE_BRACKET_CLOSE;
    }
    if (open === CURLY_BRACKET_OPEN) {
        return CURLY_BRACKET_CLOSE;
    }
}

function read_context(parser) {
    const start = parser.index;
    let i = parser.index;
    const code = full_char_code_at(parser.template, i);
    if (isIdentifierStart(code, true)) {
        return {
            type: 'Identifier',
            name: parser.read_identifier(),
            start,
            end: parser.index
        };
    }
    if (!is_bracket_open(code)) {
        parser.error({
            code: 'unexpected-token',
            message: 'Expected identifier or destructure pattern'
        });
    }
    const bracket_stack = [code];
    i += code <= 0xffff ? 1 : 2;
    while (i < parser.template.length) {
        const code = full_char_code_at(parser.template, i);
        if (is_bracket_open(code)) {
            bracket_stack.push(code);
        }
        else if (is_bracket_close(code)) {
            if (!is_bracket_pair(bracket_stack[bracket_stack.length - 1], code)) {
                parser.error({
                    code: 'unexpected-token',
                    message: `Expected ${String.fromCharCode(get_bracket_close(bracket_stack[bracket_stack.length - 1]))}`
                });
            }
            bracket_stack.pop();
            if (bracket_stack.length === 0) {
                i += code <= 0xffff ? 1 : 2;
                break;
            }
        }
        i += code <= 0xffff ? 1 : 2;
    }
    parser.index = i;
    const pattern_string = parser.template.slice(start, i);
    try {
        // the length of the `space_with_newline` has to be start - 1
        // because we added a `(` in front of the pattern_string,
        // which shifted the entire string to right by 1
        // so we offset it by removing 1 character in the `space_with_newline`
        // to achieve that, we remove the 1st space encountered,
        // so it will not affect the `column` of the node
        let space_with_newline = parser.template.slice(0, start).replace(/[^\n]/g, ' ');
        const first_space = space_with_newline.indexOf(' ');
        space_with_newline = space_with_newline.slice(0, first_space) + space_with_newline.slice(first_space + 1);
        return parse_expression_at(`${space_with_newline}(${pattern_string} = 1)`, start - 1).left;
    }
    catch (error) {
        parser.acorn_error(error);
    }
}

function trim_start(str) {
    let i = 0;
    while (whitespace.test(str[i]))
        i += 1;
    return str.slice(i);
}
function trim_end(str) {
    let i = str.length;
    while (whitespace.test(str[i - 1]))
        i -= 1;
    return str.slice(0, i);
}

function to_string(node) {
    switch (node.type) {
        case 'IfBlock':
            return '{#if} block';
        case 'ThenBlock':
            return '{:then} block';
        case 'ElseBlock':
            return '{:else} block';
        case 'PendingBlock':
        case 'AwaitBlock':
            return '{#await} block';
        case 'CatchBlock':
            return '{:catch} block';
        case 'EachBlock':
            return '{#each} block';
        case 'RawMustacheTag':
            return '{@html} block';
        case 'DebugTag':
            return '{@debug} block';
        case 'Element':
        case 'InlineComponent':
        case 'Slot':
        case 'Title':
            return `<${node.name}> tag`;
        default:
            return node.type;
    }
}

function trim_whitespace(block, trim_before, trim_after) {
    if (!block.children || block.children.length === 0)
        return; // AwaitBlock
    const first_child = block.children[0];
    const last_child = block.children[block.children.length - 1];
    if (first_child.type === 'Text' && trim_before) {
        first_child.data = trim_start(first_child.data);
        if (!first_child.data)
            block.children.shift();
    }
    if (last_child.type === 'Text' && trim_after) {
        last_child.data = trim_end(last_child.data);
        if (!last_child.data)
            block.children.pop();
    }
    if (block.else) {
        trim_whitespace(block.else, trim_before, trim_after);
    }
    if (first_child.elseif) {
        trim_whitespace(first_child, trim_before, trim_after);
    }
}
function mustache(parser) {
    const start = parser.index;
    parser.index += 1;
    parser.allow_whitespace();
    // {/if}, {/each}, {/await} or {/key}
    if (parser.eat('/')) {
        let block = parser.current();
        let expected;
        if (closing_tag_omitted(block.name)) {
            block.end = start;
            parser.stack.pop();
            block = parser.current();
        }
        if (block.type === 'ElseBlock' || block.type === 'PendingBlock' || block.type === 'ThenBlock' || block.type === 'CatchBlock') {
            block.end = start;
            parser.stack.pop();
            block = parser.current();
            expected = 'await';
        }
        if (block.type === 'IfBlock') {
            expected = 'if';
        }
        else if (block.type === 'EachBlock') {
            expected = 'each';
        }
        else if (block.type === 'AwaitBlock') {
            expected = 'await';
        }
        else if (block.type === 'KeyBlock') {
            expected = 'key';
        }
        else {
            parser.error({
                code: 'unexpected-block-close',
                message: 'Unexpected block closing tag'
            });
        }
        parser.eat(expected, true);
        parser.allow_whitespace();
        parser.eat('}', true);
        while (block.elseif) {
            block.end = parser.index;
            parser.stack.pop();
            block = parser.current();
            if (block.else) {
                block.else.end = start;
            }
        }
        // strip leading/trailing whitespace as necessary
        const char_before = parser.template[block.start - 1];
        const char_after = parser.template[parser.index];
        const trim_before = !char_before || whitespace.test(char_before);
        const trim_after = !char_after || whitespace.test(char_after);
        trim_whitespace(block, trim_before, trim_after);
        block.end = parser.index;
        parser.stack.pop();
    }
    else if (parser.eat(':else')) {
        if (parser.eat('if')) {
            parser.error({
                code: 'invalid-elseif',
                message: "'elseif' should be 'else if'"
            });
        }
        parser.allow_whitespace();
        // :else if
        if (parser.eat('if')) {
            const block = parser.current();
            if (block.type !== 'IfBlock') {
                parser.error({
                    code: 'invalid-elseif-placement',
                    message: parser.stack.some(block => block.type === 'IfBlock')
                        ? `Expected to close ${to_string(block)} before seeing {:else if ...} block`
                        : 'Cannot have an {:else if ...} block outside an {#if ...} block'
                });
            }
            parser.require_whitespace();
            const expression = read_expression(parser);
            parser.allow_whitespace();
            parser.eat('}', true);
            block.else = {
                start: parser.index,
                end: null,
                type: 'ElseBlock',
                children: [
                    {
                        start: parser.index,
                        end: null,
                        type: 'IfBlock',
                        elseif: true,
                        expression,
                        children: []
                    }
                ]
            };
            parser.stack.push(block.else.children[0]);
        }
        else {
            // :else
            const block = parser.current();
            if (block.type !== 'IfBlock' && block.type !== 'EachBlock') {
                parser.error({
                    code: 'invalid-else-placement',
                    message: parser.stack.some(block => block.type === 'IfBlock' || block.type === 'EachBlock')
                        ? `Expected to close ${to_string(block)} before seeing {:else} block`
                        : 'Cannot have an {:else} block outside an {#if ...} or {#each ...} block'
                });
            }
            parser.allow_whitespace();
            parser.eat('}', true);
            block.else = {
                start: parser.index,
                end: null,
                type: 'ElseBlock',
                children: []
            };
            parser.stack.push(block.else);
        }
    }
    else if (parser.match(':then') || parser.match(':catch')) {
        const block = parser.current();
        const is_then = parser.eat(':then') || !parser.eat(':catch');
        if (is_then) {
            if (block.type !== 'PendingBlock') {
                parser.error({
                    code: 'invalid-then-placement',
                    message: parser.stack.some(block => block.type === 'PendingBlock')
                        ? `Expected to close ${to_string(block)} before seeing {:then} block`
                        : 'Cannot have an {:then} block outside an {#await ...} block'
                });
            }
        }
        else {
            if (block.type !== 'ThenBlock' && block.type !== 'PendingBlock') {
                parser.error({
                    code: 'invalid-catch-placement',
                    message: parser.stack.some(block => block.type === 'ThenBlock' || block.type === 'PendingBlock')
                        ? `Expected to close ${to_string(block)} before seeing {:catch} block`
                        : 'Cannot have an {:catch} block outside an {#await ...} block'
                });
            }
        }
        block.end = start;
        parser.stack.pop();
        const await_block = parser.current();
        if (!parser.eat('}')) {
            parser.require_whitespace();
            await_block[is_then ? 'value' : 'error'] = read_context(parser);
            parser.allow_whitespace();
            parser.eat('}', true);
        }
        const new_block = {
            start,
            end: null,
            type: is_then ? 'ThenBlock' : 'CatchBlock',
            children: [],
            skip: false
        };
        await_block[is_then ? 'then' : 'catch'] = new_block;
        parser.stack.push(new_block);
    }
    else if (parser.eat('#')) {
        // {#if foo}, {#each foo} or {#await foo}
        let type;
        if (parser.eat('if')) {
            type = 'IfBlock';
        }
        else if (parser.eat('each')) {
            type = 'EachBlock';
        }
        else if (parser.eat('await')) {
            type = 'AwaitBlock';
        }
        else if (parser.eat('key')) {
            type = 'KeyBlock';
        }
        else {
            parser.error({
                code: 'expected-block-type',
                message: 'Expected if, each, await or key'
            });
        }
        parser.require_whitespace();
        const expression = read_expression(parser);
        const block = type === 'AwaitBlock' ?
            {
                start,
                end: null,
                type,
                expression,
                value: null,
                error: null,
                pending: {
                    start: null,
                    end: null,
                    type: 'PendingBlock',
                    children: [],
                    skip: true
                },
                then: {
                    start: null,
                    end: null,
                    type: 'ThenBlock',
                    children: [],
                    skip: true
                },
                catch: {
                    start: null,
                    end: null,
                    type: 'CatchBlock',
                    children: [],
                    skip: true
                }
            } :
            {
                start,
                end: null,
                type,
                expression,
                children: []
            };
        parser.allow_whitespace();
        // {#each} blocks must declare a context – {#each list as item}
        if (type === 'EachBlock') {
            parser.eat('as', true);
            parser.require_whitespace();
            block.context = read_context(parser);
            parser.allow_whitespace();
            if (parser.eat(',')) {
                parser.allow_whitespace();
                block.index = parser.read_identifier();
                if (!block.index) {
                    parser.error({
                        code: 'expected-name',
                        message: 'Expected name'
                    });
                }
                parser.allow_whitespace();
            }
            if (parser.eat('(')) {
                parser.allow_whitespace();
                block.key = read_expression(parser);
                parser.allow_whitespace();
                parser.eat(')', true);
                parser.allow_whitespace();
            }
        }
        const await_block_shorthand = type === 'AwaitBlock' && parser.eat('then');
        if (await_block_shorthand) {
            parser.require_whitespace();
            block.value = read_context(parser);
            parser.allow_whitespace();
        }
        const await_block_catch_shorthand = !await_block_shorthand && type === 'AwaitBlock' && parser.eat('catch');
        if (await_block_catch_shorthand) {
            parser.require_whitespace();
            block.error = read_context(parser);
            parser.allow_whitespace();
        }
        parser.eat('}', true);
        parser.current().children.push(block);
        parser.stack.push(block);
        if (type === 'AwaitBlock') {
            let child_block;
            if (await_block_shorthand) {
                block.then.skip = false;
                child_block = block.then;
            }
            else if (await_block_catch_shorthand) {
                block.catch.skip = false;
                child_block = block.catch;
            }
            else {
                block.pending.skip = false;
                child_block = block.pending;
            }
            child_block.start = parser.index;
            parser.stack.push(child_block);
        }
    }
    else if (parser.eat('@html')) {
        // {@html content} tag
        parser.require_whitespace();
        const expression = read_expression(parser);
        parser.allow_whitespace();
        parser.eat('}', true);
        parser.current().children.push({
            start,
            end: parser.index,
            type: 'RawMustacheTag',
            expression
        });
    }
    else if (parser.eat('@debug')) {
        let identifiers;
        // Implies {@debug} which indicates "debug all"
        if (parser.read(/\s*}/)) {
            identifiers = [];
        }
        else {
            const expression = read_expression(parser);
            identifiers = expression.type === 'SequenceExpression'
                ? expression.expressions
                : [expression];
            identifiers.forEach(node => {
                if (node.type !== 'Identifier') {
                    parser.error({
                        code: 'invalid-debug-args',
                        message: '{@debug ...} arguments must be identifiers, not arbitrary expressions'
                    }, node.start);
                }
            });
            parser.allow_whitespace();
            parser.eat('}', true);
        }
        parser.current().children.push({
            start,
            end: parser.index,
            type: 'DebugTag',
            identifiers
        });
    }
    else {
        const expression = read_expression(parser);
        parser.allow_whitespace();
        parser.eat('}', true);
        parser.current().children.push({
            start,
            end: parser.index,
            type: 'MustacheTag',
            expression
        });
    }
}

function text(parser) {
    const start = parser.index;
    let data = '';
    while (parser.index < parser.template.length &&
        !parser.match('<') &&
        !parser.match('{')) {
        data += parser.template[parser.index++];
    }
    const node = {
        start,
        end: parser.index,
        type: 'Text',
        raw: data,
        data: decode_character_references(data)
    };
    parser.current().children.push(node);
}

function fragment(parser) {
    if (parser.match('<')) {
        return tag;
    }
    if (parser.match('{')) {
        return mustache;
    }
    return text;
}

function getLocator(source, options) {
    if (options === void 0) { options = {}; }
    var offsetLine = options.offsetLine || 0;
    var offsetColumn = options.offsetColumn || 0;
    var originalLines = source.split('\n');
    var start = 0;
    var lineRanges = originalLines.map(function (line, i) {
        var end = start + line.length + 1;
        var range = { start: start, end: end, line: i };
        start = end;
        return range;
    });
    var i = 0;
    function rangeContains(range, index) {
        return range.start <= index && index < range.end;
    }
    function getLocation(range, index) {
        return { line: offsetLine + range.line, column: offsetColumn + index - range.start, character: index };
    }
    function locate(search, startIndex) {
        if (typeof search === 'string') {
            search = source.indexOf(search, startIndex || 0);
        }
        var range = lineRanges[i];
        var d = search >= range.end ? 1 : -1;
        while (range) {
            if (rangeContains(range, search))
                return getLocation(range, search);
            i += d;
            range = lineRanges[i];
        }
    }
    return locate;
}
function locate(source, search, options) {
    if (typeof options === 'number') {
        throw new Error('locate takes a { startIndex, offsetLine, offsetColumn } object as the third argument');
    }
    return getLocator(source, options)(search, options && options.startIndex);
}

function tabs_to_spaces(str) {
    return str.replace(/^\t+/, match => match.split('\t').join('  '));
}
function get_code_frame(source, line, column) {
    const lines = source.split('\n');
    const frame_start = Math.max(0, line - 2);
    const frame_end = Math.min(line + 3, lines.length);
    const digits = String(frame_end + 1).length;
    return lines
        .slice(frame_start, frame_end)
        .map((str, i) => {
        const isErrorLine = frame_start + i === line;
        const line_num = String(i + frame_start + 1).padStart(digits, ' ');
        if (isErrorLine) {
            const indicator = ' '.repeat(digits + 2 + tabs_to_spaces(str.slice(0, column)).length) + '^';
            return `${line_num}: ${tabs_to_spaces(str)}\n${indicator}`;
        }
        return `${line_num}: ${tabs_to_spaces(str)}`;
    })
        .join('\n');
}

class CompileError extends Error {
    toString() {
        return `${this.message} (${this.start.line}:${this.start.column})\n${this.frame}`;
    }
}
function error(message, props) {
    const error = new CompileError(message);
    error.name = props.name;
    const start = locate(props.source, props.start, { offsetLine: 1 });
    const end = locate(props.source, props.end || props.start, { offsetLine: 1 });
    error.code = props.code;
    error.start = start;
    error.end = end;
    error.pos = props.start;
    error.filename = props.filename;
    error.frame = get_code_frame(props.source, start.line - 1, start.column);
    throw error;
}

class Parser$1 {
    constructor(template, options) {
        this.index = 0;
        this.stack = [];
        this.css = [];
        this.js = [];
        this.meta_tags = {};
        if (typeof template !== 'string') {
            throw new TypeError('Template must be a string');
        }
        this.template = template.replace(/\s+$/, '');
        this.filename = options.filename;
        this.customElement = options.customElement;
        this.html = {
            start: null,
            end: null,
            type: 'Fragment',
            children: []
        };
        this.stack.push(this.html);
        let state = fragment;
        while (this.index < this.template.length) {
            state = state(this) || fragment;
        }
        if (this.stack.length > 1) {
            const current = this.current();
            const type = current.type === 'Element' ? `<${current.name}>` : 'Block';
            const slug = current.type === 'Element' ? 'element' : 'block';
            this.error({
                code: `unclosed-${slug}`,
                message: `${type} was left open`
            }, current.start);
        }
        if (state !== fragment) {
            this.error({
                code: 'unexpected-eof',
                message: 'Unexpected end of input'
            });
        }
        if (this.html.children.length) {
            let start = this.html.children[0].start;
            while (whitespace.test(template[start]))
                start += 1;
            let end = this.html.children[this.html.children.length - 1].end;
            while (whitespace.test(template[end - 1]))
                end -= 1;
            this.html.start = start;
            this.html.end = end;
        }
        else {
            this.html.start = this.html.end = null;
        }
    }
    current() {
        return this.stack[this.stack.length - 1];
    }
    acorn_error(err) {
        this.error({
            code: 'parse-error',
            message: err.message.replace(/ \(\d+:\d+\)$/, '')
        }, err.pos);
    }
    error({ code, message }, index = this.index) {
        error(message, {
            name: 'ParseError',
            code,
            source: this.template,
            start: index,
            filename: this.filename
        });
    }
    eat(str, required, message) {
        if (this.match(str)) {
            this.index += str.length;
            return true;
        }
        if (required) {
            this.error({
                code: `unexpected-${this.index === this.template.length ? 'eof' : 'token'}`,
                message: message || `Expected ${str}`
            });
        }
        return false;
    }
    match(str) {
        return this.template.slice(this.index, this.index + str.length) === str;
    }
    match_regex(pattern) {
        const match = pattern.exec(this.template.slice(this.index));
        if (!match || match.index !== 0)
            return null;
        return match[0];
    }
    allow_whitespace() {
        while (this.index < this.template.length &&
            whitespace.test(this.template[this.index])) {
            this.index++;
        }
    }
    read(pattern) {
        const result = this.match_regex(pattern);
        if (result)
            this.index += result.length;
        return result;
    }
    read_identifier(allow_reserved = false) {
        const start = this.index;
        let i = this.index;
        const code = full_char_code_at(this.template, i);
        if (!isIdentifierStart(code, true))
            return null;
        i += code <= 0xffff ? 1 : 2;
        while (i < this.template.length) {
            const code = full_char_code_at(this.template, i);
            if (!isIdentifierChar(code, true))
                break;
            i += code <= 0xffff ? 1 : 2;
        }
        const identifier = this.template.slice(this.index, this.index = i);
        if (!allow_reserved && reserved.has(identifier)) {
            this.error({
                code: 'unexpected-reserved-word',
                message: `'${identifier}' is a reserved word in JavaScript and cannot be used here`
            }, start);
        }
        return identifier;
    }
    read_until(pattern) {
        if (this.index >= this.template.length) {
            this.error({
                code: 'unexpected-eof',
                message: 'Unexpected end of input'
            });
        }
        const start = this.index;
        const match = pattern.exec(this.template.slice(start));
        if (match) {
            this.index = start + match.index;
            return this.template.slice(start, this.index);
        }
        this.index = this.template.length;
        return this.template.slice(start);
    }
    require_whitespace() {
        if (!whitespace.test(this.template[this.index])) {
            this.error({
                code: 'missing-whitespace',
                message: 'Expected whitespace'
            });
        }
        this.allow_whitespace();
    }
}
function parse$3(template, options = {}) {
    const parser = new Parser$1(template, options);
    // TODO we may want to allow multiple <style> tags —
    // one scoped, one global. for now, only allow one
    if (parser.css.length > 1) {
        parser.error({
            code: 'duplicate-style',
            message: 'You can only have one top-level <style> tag per component'
        }, parser.css[1].start);
    }
    const instance_scripts = parser.js.filter(script => script.context === 'default');
    const module_scripts = parser.js.filter(script => script.context === 'module');
    if (instance_scripts.length > 1) {
        parser.error({
            code: 'invalid-script',
            message: 'A component can only have one instance-level <script> element'
        }, instance_scripts[1].start);
    }
    if (module_scripts.length > 1) {
        parser.error({
            code: 'invalid-script',
            message: 'A component can only have one <script context="module"> element'
        }, module_scripts[1].start);
    }
    return {
        html: parser.html,
        css: parser.css[0],
        instance: instance_scripts[0],
        module: module_scripts[0]
    };
}

function is_head(node) {
    return node && node.type === 'MemberExpression' && node.object.name === '@_document' && node.property.name === 'head';
}

class Block$1 {
    constructor(options) {
        this.dependencies = new Set();
        this.binding_group_initialised = new Set();
        this.event_listeners = [];
        this.variables = new Map();
        this.has_update_method = false;
        this.parent = options.parent;
        this.renderer = options.renderer;
        this.name = options.name;
        this.type = options.type;
        this.comment = options.comment;
        this.wrappers = [];
        // for keyed each blocks
        this.key = options.key;
        this.first = null;
        this.bindings = options.bindings;
        this.chunks = {
            declarations: [],
            init: [],
            create: [],
            claim: [],
            hydrate: [],
            mount: [],
            measure: [],
            fix: [],
            animate: [],
            intro: [],
            update: [],
            outro: [],
            destroy: []
        };
        this.has_animation = false;
        this.has_intro_method = false; // a block could have an intro method but not intro transitions, e.g. if a sibling block has intros
        this.has_outro_method = false;
        this.outros = 0;
        this.get_unique_name = this.renderer.component.get_unique_name_maker();
        this.aliases = new Map();
        if (this.key)
            this.aliases.set('key', this.get_unique_name('key'));
    }
    assign_variable_names() {
        const seen = new Set();
        const dupes = new Set();
        let i = this.wrappers.length;
        while (i--) {
            const wrapper = this.wrappers[i];
            if (!wrapper.var)
                continue;
            if (seen.has(wrapper.var.name)) {
                dupes.add(wrapper.var.name);
            }
            seen.add(wrapper.var.name);
        }
        const counts = new Map();
        i = this.wrappers.length;
        while (i--) {
            const wrapper = this.wrappers[i];
            if (!wrapper.var)
                continue;
            let suffix = '';
            if (dupes.has(wrapper.var.name)) {
                const i = counts.get(wrapper.var.name) || 0;
                counts.set(wrapper.var.name, i + 1);
                suffix = i;
            }
            wrapper.var.name = this.get_unique_name(wrapper.var.name + suffix).name;
        }
    }
    add_dependencies(dependencies) {
        dependencies.forEach(dependency => {
            this.dependencies.add(dependency);
        });
        this.has_update_method = true;
        if (this.parent) {
            this.parent.add_dependencies(dependencies);
        }
    }
    add_element(id, render_statement, claim_statement, parent_node, no_detach) {
        this.add_variable(id);
        this.chunks.create.push(b `${id} = ${render_statement};`);
        if (this.renderer.options.hydratable) {
            this.chunks.claim.push(b `${id} = ${claim_statement || render_statement};`);
        }
        if (parent_node) {
            this.chunks.mount.push(b `@append(${parent_node}, ${id});`);
            if (is_head(parent_node) && !no_detach)
                this.chunks.destroy.push(b `@detach(${id});`);
        }
        else {
            this.chunks.mount.push(b `@insert(#target, ${id}, #anchor);`);
            if (!no_detach)
                this.chunks.destroy.push(b `if (detaching) @detach(${id});`);
        }
    }
    add_intro(local) {
        this.has_intros = this.has_intro_method = true;
        if (!local && this.parent)
            this.parent.add_intro();
    }
    add_outro(local) {
        this.has_outros = this.has_outro_method = true;
        this.outros += 1;
        if (!local && this.parent)
            this.parent.add_outro();
    }
    add_animation() {
        this.has_animation = true;
    }
    add_variable(id, init) {
        if (this.variables.has(id.name)) {
            throw new Error(`Variable '${id.name}' already initialised with a different value`);
        }
        this.variables.set(id.name, { id, init });
    }
    alias(name) {
        if (!this.aliases.has(name)) {
            this.aliases.set(name, this.get_unique_name(name));
        }
        return this.aliases.get(name);
    }
    child(options) {
        return new Block$1(Object.assign({}, this, { key: null }, options, { parent: this }));
    }
    get_contents(key) {
        const { dev } = this.renderer.options;
        if (this.has_outros) {
            this.add_variable({ type: 'Identifier', name: '#current' });
            if (this.chunks.intro.length > 0) {
                this.chunks.intro.push(b `#current = true;`);
                this.chunks.mount.push(b `#current = true;`);
            }
            if (this.chunks.outro.length > 0) {
                this.chunks.outro.push(b `#current = false;`);
            }
        }
        if (this.autofocus) {
            this.chunks.mount.push(b `${this.autofocus}.focus();`);
        }
        this.render_listeners();
        const properties = {};
        const noop = x `@noop`;
        properties.key = key;
        if (this.first) {
            properties.first = x `null`;
            this.chunks.hydrate.push(b `this.first = ${this.first};`);
        }
        if (this.chunks.create.length === 0 && this.chunks.hydrate.length === 0) {
            properties.create = noop;
        }
        else {
            const hydrate = this.chunks.hydrate.length > 0 && (this.renderer.options.hydratable
                ? b `this.h();`
                : this.chunks.hydrate);
            properties.create = x `function #create() {
				${this.chunks.create}
				${hydrate}
			}`;
        }
        if (this.renderer.options.hydratable || this.chunks.claim.length > 0) {
            if (this.chunks.claim.length === 0 && this.chunks.hydrate.length === 0) {
                properties.claim = noop;
            }
            else {
                properties.claim = x `function #claim(#nodes) {
					${this.chunks.claim}
					${this.renderer.options.hydratable && this.chunks.hydrate.length > 0 && b `this.h();`}
				}`;
            }
        }
        if (this.renderer.options.hydratable && this.chunks.hydrate.length > 0) {
            properties.hydrate = x `function #hydrate() {
				${this.chunks.hydrate}
			}`;
        }
        if (this.chunks.mount.length === 0) {
            properties.mount = noop;
        }
        else if (this.event_listeners.length === 0) {
            properties.mount = x `function #mount(#target, #anchor) {
				${this.chunks.mount}
			}`;
        }
        else {
            properties.mount = x `function #mount(#target, #anchor) {
				${this.chunks.mount}
			}`;
        }
        if (this.has_update_method || this.maintain_context) {
            if (this.chunks.update.length === 0 && !this.maintain_context) {
                properties.update = noop;
            }
            else {
                const ctx = this.maintain_context ? x `#new_ctx` : x `#ctx`;
                let dirty = { type: 'Identifier', name: '#dirty' };
                if (!this.renderer.context_overflow && !this.parent) {
                    dirty = { type: 'ArrayPattern', elements: [dirty] };
                }
                properties.update = x `function #update(${ctx}, ${dirty}) {
					${this.maintain_context && b `#ctx = ${ctx};`}
					${this.chunks.update}
				}`;
            }
        }
        if (this.has_animation) {
            properties.measure = x `function #measure() {
				${this.chunks.measure}
			}`;
            properties.fix = x `function #fix() {
				${this.chunks.fix}
			}`;
            properties.animate = x `function #animate() {
				${this.chunks.animate}
			}`;
        }
        if (this.has_intro_method || this.has_outro_method) {
            if (this.chunks.intro.length === 0) {
                properties.intro = noop;
            }
            else {
                properties.intro = x `function #intro(#local) {
					${this.has_outros && b `if (#current) return;`}
					${this.chunks.intro}
				}`;
            }
            if (this.chunks.outro.length === 0) {
                properties.outro = noop;
            }
            else {
                properties.outro = x `function #outro(#local) {
					${this.chunks.outro}
				}`;
            }
        }
        if (this.chunks.destroy.length === 0) {
            properties.destroy = noop;
        }
        else {
            properties.destroy = x `function #destroy(detaching) {
				${this.chunks.destroy}
			}`;
        }
        if (!this.renderer.component.compile_options.dev) {
            // allow shorthand names
            for (const name in properties) {
                const property = properties[name];
                if (property)
                    property.id = null;
            }
        }
        const return_value = x `{
			key: ${properties.key},
			first: ${properties.first},
			c: ${properties.create},
			l: ${properties.claim},
			h: ${properties.hydrate},
			m: ${properties.mount},
			p: ${properties.update},
			r: ${properties.measure},
			f: ${properties.fix},
			a: ${properties.animate},
			i: ${properties.intro},
			o: ${properties.outro},
			d: ${properties.destroy}
		}`;
        const block = dev && this.get_unique_name('block');
        const body = b `
			${this.chunks.declarations}

			${Array.from(this.variables.values()).map(({ id, init }) => {
            return init
                ? b `let ${id} = ${init}`
                : b `let ${id}`;
        })}

			${this.chunks.init}

			${dev
            ? b `
					const ${block} = ${return_value};
					@dispatch_dev("SvelteRegisterBlock", {
						block: ${block},
						id: ${this.name || 'create_fragment'}.name,
						type: "${this.type}",
						source: "${this.comment ? this.comment.replace(/"/g, '\\"') : ''}",
						ctx: #ctx
					});
					return ${block};`
            : b `
					return ${return_value};`}
		`;
        return body;
    }
    has_content() {
        return !!this.first ||
            this.event_listeners.length > 0 ||
            this.chunks.intro.length > 0 ||
            this.chunks.outro.length > 0 ||
            this.chunks.create.length > 0 ||
            this.chunks.hydrate.length > 0 ||
            this.chunks.claim.length > 0 ||
            this.chunks.mount.length > 0 ||
            this.chunks.update.length > 0 ||
            this.chunks.destroy.length > 0 ||
            this.has_animation;
    }
    render() {
        const key = this.key && this.get_unique_name('key');
        const args = [x `#ctx`];
        if (key)
            args.unshift(key);
        const fn = b `function ${this.name}(${args}) {
			${this.get_contents(key)}
		}`;
        return this.comment
            ? b `
				// ${this.comment}
				${fn}`
            : fn;
    }
    render_listeners(chunk = '') {
        if (this.event_listeners.length > 0) {
            this.add_variable({ type: 'Identifier', name: '#mounted' });
            this.chunks.destroy.push(b `#mounted = false`);
            const dispose = {
                type: 'Identifier',
                name: `#dispose${chunk}`
            };
            this.add_variable(dispose);
            if (this.event_listeners.length === 1) {
                this.chunks.mount.push(b `
						if (!#mounted) {
							${dispose} = ${this.event_listeners[0]};
							#mounted = true;
						}
					`);
                this.chunks.destroy.push(b `${dispose}();`);
            }
            else {
                this.chunks.mount.push(b `
					if (!#mounted) {
						${dispose} = [
							${this.event_listeners}
						];
						#mounted = true;
					}
				`);
                this.chunks.destroy.push(b `@run_all(${dispose});`);
            }
        }
    }
}

class Wrapper {
    constructor(renderer, block, parent, node) {
        this.node = node;
        // make these non-enumerable so that they can be logged sensibly
        // (TODO in dev only?)
        Object.defineProperties(this, {
            renderer: {
                value: renderer
            },
            parent: {
                value: parent
            }
        });
        this.can_use_innerhtml = !renderer.options.hydratable;
        this.is_static_content = !renderer.options.hydratable;
        block.wrappers.push(this);
    }
    cannot_use_innerhtml() {
        this.can_use_innerhtml = false;
        if (this.parent)
            this.parent.cannot_use_innerhtml();
    }
    not_static_content() {
        this.is_static_content = false;
        if (this.parent)
            this.parent.not_static_content();
    }
    get_or_create_anchor(block, parent_node, parent_nodes) {
        // TODO use this in EachBlock and IfBlock — tricky because
        // children need to be created first
        const needs_anchor = this.next ? !this.next.is_dom_node() : !parent_node || !this.parent.is_dom_node();
        const anchor = needs_anchor
            ? block.get_unique_name(`${this.var.name}_anchor`)
            : (this.next && this.next.var) || { type: 'Identifier', name: 'null' };
        if (needs_anchor) {
            block.add_element(anchor, x `@empty()`, parent_nodes && x `@empty()`, parent_node);
        }
        return anchor;
    }
    get_update_mount_node(anchor) {
        return ((this.parent && this.parent.is_dom_node())
            ? this.parent.var
            : x `${anchor}.parentNode`);
    }
    is_dom_node() {
        return (this.node.type === 'Element' ||
            this.node.type === 'Text' ||
            this.node.type === 'MustacheTag');
    }
    render(_block, _parent_node, _parent_nodes) {
        throw Error('Wrapper class is not renderable');
    }
}

function create_debugging_comment(node, component) {
    const { locate, source } = component;
    let c = node.start;
    if (node.type === 'ElseBlock') {
        while (source[c - 1] !== '{')
            c -= 1;
        while (source[c - 1] === '{')
            c -= 1;
    }
    let d;
    if (node.type === 'InlineComponent' || node.type === 'Element' || node.type === 'SlotTemplate') {
        if (node.children.length) {
            d = node.children[0].start;
            while (source[d - 1] !== '>')
                d -= 1;
        }
        else {
            d = node.start;
            while (source[d] !== '>')
                d += 1;
            d += 1;
        }
    }
    else if (node.type === 'Text' || node.type === 'Comment') {
        d = node.end;
    }
    else {
        // @ts-ignore
        d = node.expression ? node.expression.node.end : c;
        while (source[d] !== '}' && d <= source.length)
            d += 1;
        while (source[d] === '}')
            d += 1;
    }
    const start = locate(c);
    const loc = `(${start.line}:${start.column})`;
    return `${loc} ${source.slice(c, d)}`.replace(/\s/g, ' ');
}

class AwaitBlockBranch extends Wrapper {
    constructor(status, renderer, block, parent, node, strip_whitespace, next_sibling) {
        super(renderer, block, parent, node);
        this.var = null;
        this.status = status;
        this.block = block.child({
            comment: create_debugging_comment(node, this.renderer.component),
            name: this.renderer.component.get_unique_name(`create_${status}_block`),
            type: status
        });
        this.add_context(parent.node[status + '_node'], parent.node[status + '_contexts']);
        this.fragment = new FragmentWrapper(renderer, this.block, this.node.children, parent, strip_whitespace, next_sibling);
        this.is_dynamic = this.block.dependencies.size > 0;
    }
    add_context(node, contexts) {
        if (!node)
            return;
        if (node.type === 'Identifier') {
            this.value = node.name;
            this.renderer.add_to_context(this.value, true);
        }
        else {
            contexts.forEach(context => {
                this.renderer.add_to_context(context.key.name, true);
            });
            this.value = this.block.parent.get_unique_name('value').name;
            this.value_contexts = contexts;
            this.renderer.add_to_context(this.value, true);
            this.is_destructured = true;
        }
        this.value_index = this.renderer.context_lookup.get(this.value).index;
    }
    render(block, parent_node, parent_nodes) {
        this.fragment.render(block, parent_node, parent_nodes);
        if (this.is_destructured) {
            this.render_destructure();
        }
    }
    render_destructure() {
        const props = this.value_contexts.map(prop => b `#ctx[${this.block.renderer.context_lookup.get(prop.key.name).index}] = ${prop.default_modifier(prop.modifier(x `#ctx[${this.value_index}]`), name => this.renderer.reference(name))};`);
        const get_context = this.block.renderer.component.get_unique_name(`get_${this.status}_context`);
        this.block.renderer.blocks.push(b `
			function ${get_context}(#ctx) {
				${props}
			}
		`);
        this.block.chunks.declarations.push(b `${get_context}(#ctx)`);
        if (this.block.has_update_method) {
            this.block.chunks.update.unshift(b `${get_context}(#ctx)`);
        }
    }
}
class AwaitBlockWrapper extends Wrapper {
    constructor(renderer, block, parent, node, strip_whitespace, next_sibling) {
        super(renderer, block, parent, node);
        this.var = { type: 'Identifier', name: 'await_block' };
        this.cannot_use_innerhtml();
        this.not_static_content();
        block.add_dependencies(this.node.expression.dependencies);
        let is_dynamic = false;
        let has_intros = false;
        let has_outros = false;
        ['pending', 'then', 'catch'].forEach((status) => {
            const child = this.node[status];
            const branch = new AwaitBlockBranch(status, renderer, block, this, child, strip_whitespace, next_sibling);
            renderer.blocks.push(branch.block);
            if (branch.is_dynamic) {
                is_dynamic = true;
                // TODO should blocks update their own parents?
                block.add_dependencies(branch.block.dependencies);
            }
            if (branch.block.has_intros)
                has_intros = true;
            if (branch.block.has_outros)
                has_outros = true;
            this[status] = branch;
        });
        ['pending', 'then', 'catch'].forEach(status => {
            this[status].block.has_update_method = is_dynamic;
            this[status].block.has_intro_method = has_intros;
            this[status].block.has_outro_method = has_outros;
        });
        if (has_outros) {
            block.add_outro();
        }
    }
    render(block, parent_node, parent_nodes) {
        const anchor = this.get_or_create_anchor(block, parent_node, parent_nodes);
        const update_mount_node = this.get_update_mount_node(anchor);
        const snippet = this.node.expression.manipulate(block);
        const info = block.get_unique_name('info');
        const promise = block.get_unique_name('promise');
        block.add_variable(promise);
        block.maintain_context = true;
        const info_props = x `{
			ctx: #ctx,
			current: null,
			token: null,
			hasCatch: ${this.catch.node.start !== null ? 'true' : 'false'},
			pending: ${this.pending.block.name},
			then: ${this.then.block.name},
			catch: ${this.catch.block.name},
			value: ${this.then.value_index},
			error: ${this.catch.value_index},
			blocks: ${this.pending.block.has_outro_method && x `[,,,]`}
		}`;
        block.chunks.init.push(b `
			let ${info} = ${info_props};
		`);
        block.chunks.init.push(b `
			@handle_promise(${promise} = ${snippet}, ${info});
		`);
        block.chunks.create.push(b `
			${info}.block.c();
		`);
        if (parent_nodes && this.renderer.options.hydratable) {
            block.chunks.claim.push(b `
				${info}.block.l(${parent_nodes});
			`);
        }
        const initial_mount_node = parent_node || '#target';
        const anchor_node = parent_node ? 'null' : '#anchor';
        const has_transitions = this.pending.block.has_intro_method || this.pending.block.has_outro_method;
        block.chunks.mount.push(b `
			${info}.block.m(${initial_mount_node}, ${info}.anchor = ${anchor_node});
			${info}.mount = () => ${update_mount_node};
			${info}.anchor = ${anchor};
		`);
        if (has_transitions) {
            block.chunks.intro.push(b `@transition_in(${info}.block);`);
        }
        const dependencies = this.node.expression.dynamic_dependencies();
        let update_child_context;
        if (this.then.value && this.catch.value) {
            update_child_context = b `#child_ctx[${this.then.value_index}] = #child_ctx[${this.catch.value_index}] = ${info}.resolved;`;
        }
        else if (this.then.value) {
            update_child_context = b `#child_ctx[${this.then.value_index}] = ${info}.resolved;`;
        }
        else if (this.catch.value) {
            update_child_context = b `#child_ctx[${this.catch.value_index}] = ${info}.resolved;`;
        }
        if (dependencies.length > 0) {
            const condition = x `
				${block.renderer.dirty(dependencies)} &&
				${promise} !== (${promise} = ${snippet}) &&
				@handle_promise(${promise}, ${info})`;
            block.chunks.update.push(b `${info}.ctx = #ctx;`);
            if (this.pending.block.has_update_method) {
                block.chunks.update.push(b `
					if (${condition}) {

					} else {
						const #child_ctx = #ctx.slice();
						${update_child_context}
						${info}.block.p(#child_ctx, #dirty);
					}
				`);
            }
            else {
                block.chunks.update.push(b `
					${condition}
				`);
            }
        }
        else {
            if (this.pending.block.has_update_method) {
                block.chunks.update.push(b `
					{
						const #child_ctx = #ctx.slice();
						${update_child_context}
						${info}.block.p(#child_ctx, #dirty);
					}
				`);
            }
        }
        if (this.pending.block.has_outro_method) {
            block.chunks.outro.push(b `
				for (let #i = 0; #i < 3; #i += 1) {
					const block = ${info}.blocks[#i];
					@transition_out(block);
				}
			`);
        }
        block.chunks.destroy.push(b `
			${info}.block.d(${parent_node ? null : 'detaching'});
			${info}.token = null;
			${info} = null;
		`);
        [this.pending, this.then, this.catch].forEach(branch => {
            branch.render(branch.block, null, x `#nodes`);
        });
    }
}

const TRUE = x `true`;
const FALSE = x `false`;
class EventHandlerWrapper {
    constructor(node, parent) {
        this.node = node;
        this.parent = parent;
        if (!node.expression) {
            this.parent.renderer.add_to_context(node.handler_name.name);
            this.parent.renderer.component.partly_hoisted.push(b `
				function ${node.handler_name.name}(event) {
					@bubble($$self, event);
				}
			`);
        }
    }
    get_snippet(block) {
        const snippet = this.node.expression ? this.node.expression.manipulate(block) : block.renderer.reference(this.node.handler_name);
        if (this.node.reassigned) {
            block.maintain_context = true;
            return x `function () { if (@is_function(${snippet})) ${snippet}.apply(this, arguments); }`;
        }
        return snippet;
    }
    render(block, target) {
        let snippet = this.get_snippet(block);
        if (this.node.modifiers.has('preventDefault'))
            snippet = x `@prevent_default(${snippet})`;
        if (this.node.modifiers.has('stopPropagation'))
            snippet = x `@stop_propagation(${snippet})`;
        if (this.node.modifiers.has('self'))
            snippet = x `@self(${snippet})`;
        const args = [];
        const opts = ['nonpassive', 'passive', 'once', 'capture'].filter(mod => this.node.modifiers.has(mod));
        if (opts.length) {
            if (opts.length === 1 && opts[0] === 'capture') {
                args.push(TRUE);
            }
            else {
                args.push(x `{ ${opts.map(opt => opt === 'nonpassive'
                    ? p `passive: false`
                    : p `${opt}: true`)} }`);
            }
        }
        else if (block.renderer.options.dev) {
            args.push(FALSE);
        }
        if (block.renderer.options.dev) {
            args.push(this.node.modifiers.has('preventDefault') ? TRUE : FALSE);
            args.push(this.node.modifiers.has('stopPropagation') ? TRUE : FALSE);
        }
        block.event_listeners.push(x `@listen(${target}, "${this.node.name}", ${snippet}, ${args})`);
    }
}

function add_event_handlers(block, target, handlers) {
    handlers.forEach(handler => add_event_handler(block, target, handler));
}
function add_event_handler(block, target, handler) {
    handler.render(block, target);
}

class BodyWrapper extends Wrapper {
    constructor(renderer, block, parent, node) {
        super(renderer, block, parent, node);
        this.handlers = this.node.handlers.map(handler => new EventHandlerWrapper(handler, this));
    }
    render(block, _parent_node, _parent_nodes) {
        add_event_handlers(block, x `@_document.body`, this.handlers);
    }
}

function add_to_set(a, b) {
    // @ts-ignore
    b.forEach(item => {
        a.add(item);
    });
}

class DebugTagWrapper extends Wrapper {
    constructor(renderer, block, parent, node, _strip_whitespace, _next_sibling) {
        super(renderer, block, parent, node);
    }
    render(block, _parent_node, _parent_nodes) {
        const { renderer } = this;
        const { component } = renderer;
        if (!renderer.options.dev)
            return;
        const { var_lookup } = component;
        const start = component.locate(this.node.start + 1);
        const end = { line: start.line, column: start.column + 6 };
        const loc = { start, end };
        const debug = {
            type: 'DebuggerStatement',
            loc
        };
        if (this.node.expressions.length === 0) {
            // Debug all
            block.chunks.create.push(debug);
            block.chunks.update.push(debug);
        }
        else {
            const log = {
                type: 'Identifier',
                name: 'log',
                loc
            };
            const dependencies = new Set();
            this.node.expressions.forEach(expression => {
                add_to_set(dependencies, expression.dependencies);
            });
            const contextual_identifiers = this.node.expressions
                .filter(e => {
                const variable = var_lookup.get(e.node.name);
                return !(variable && variable.hoistable);
            })
                .map(e => e.node.name);
            const logged_identifiers = this.node.expressions.map(e => p `${e.node.name}`);
            const debug_statements = b `
				${contextual_identifiers.map(name => b `const ${name} = ${renderer.reference(name)};`)}
				@_console.${log}({ ${logged_identifiers} });
				debugger;`;
            if (dependencies.size) {
                const condition = renderer.dirty(Array.from(dependencies));
                block.chunks.update.push(b `
					if (${condition}) {
						${debug_statements}
					}
				`);
            }
            block.chunks.create.push(b `{
				${debug_statements}
			}`);
        }
    }
}

function get_object(node) {
    while (node.type === 'MemberExpression')
        node = node.object;
    return node;
}

class ElseBlockWrapper extends Wrapper {
    constructor(renderer, block, parent, node, strip_whitespace, next_sibling) {
        super(renderer, block, parent, node);
        this.var = null;
        this.block = block.child({
            comment: create_debugging_comment(node, this.renderer.component),
            name: this.renderer.component.get_unique_name('create_else_block'),
            type: 'else'
        });
        this.fragment = new FragmentWrapper(renderer, this.block, this.node.children, parent, strip_whitespace, next_sibling);
        this.is_dynamic = this.block.dependencies.size > 0;
    }
}
class EachBlockWrapper extends Wrapper {
    constructor(renderer, block, parent, node, strip_whitespace, next_sibling) {
        super(renderer, block, parent, node);
        this.updates = [];
        this.var = { type: 'Identifier', name: 'each' };
        this.cannot_use_innerhtml();
        this.not_static_content();
        const { dependencies } = node.expression;
        block.add_dependencies(dependencies);
        this.node.contexts.forEach(context => {
            renderer.add_to_context(context.key.name, true);
        });
        this.block = block.child({
            comment: create_debugging_comment(this.node, this.renderer.component),
            name: renderer.component.get_unique_name('create_each_block'),
            type: 'each',
            // @ts-ignore todo: probably error
            key: node.key,
            bindings: new Map(block.bindings)
        });
        // TODO this seems messy
        this.block.has_animation = this.node.has_animation;
        this.index_name = this.node.index
            ? { type: 'Identifier', name: this.node.index }
            : renderer.component.get_unique_name(`${this.node.context}_index`);
        const fixed_length = node.expression.node.type === 'ArrayExpression' &&
            node.expression.node.elements.every(element => element.type !== 'SpreadElement')
            ? node.expression.node.elements.length
            : null;
        // hack the sourcemap, so that if data is missing the bug
        // is easy to find
        let c = this.node.start + 2;
        while (renderer.component.source[c] !== 'e')
            c += 1;
        const start = renderer.component.locate(c);
        const end = { line: start.line, column: start.column + 4 };
        const length = {
            type: 'Identifier',
            name: 'length',
            loc: { start, end }
        };
        const each_block_value = renderer.component.get_unique_name(`${this.var.name}_value`);
        const iterations = block.get_unique_name(`${this.var.name}_blocks`);
        renderer.add_to_context(each_block_value.name, true);
        renderer.add_to_context(this.index_name.name, true);
        this.vars = {
            create_each_block: this.block.name,
            each_block_value,
            get_each_context: renderer.component.get_unique_name(`get_${this.var.name}_context`),
            iterations,
            // optimisation for array literal
            fixed_length,
            data_length: fixed_length === null ? x `${each_block_value}.${length}` : fixed_length,
            view_length: fixed_length === null ? x `${iterations}.length` : fixed_length
        };
        const object = get_object(node.expression.node);
        const store = object.type === 'Identifier' && object.name[0] === '$' ? object.name.slice(1) : null;
        node.contexts.forEach(prop => {
            this.block.bindings.set(prop.key.name, {
                object: this.vars.each_block_value,
                property: this.index_name,
                modifier: prop.modifier,
                snippet: prop.modifier(x `${this.vars.each_block_value}[${this.index_name}]`),
                store
            });
        });
        if (this.node.index) {
            this.block.get_unique_name(this.node.index); // this prevents name collisions (#1254)
        }
        renderer.blocks.push(this.block);
        this.fragment = new FragmentWrapper(renderer, this.block, node.children, this, strip_whitespace, next_sibling);
        if (this.node.else) {
            this.else = new ElseBlockWrapper(renderer, block, this, this.node.else, strip_whitespace, next_sibling);
            renderer.blocks.push(this.else.block);
            if (this.else.is_dynamic) {
                this.block.add_dependencies(this.else.block.dependencies);
            }
        }
        block.add_dependencies(this.block.dependencies);
        if (this.block.has_outros || (this.else && this.else.block.has_outros)) {
            block.add_outro();
        }
    }
    render(block, parent_node, parent_nodes) {
        if (this.fragment.nodes.length === 0)
            return;
        const { renderer } = this;
        const { component } = renderer;
        const needs_anchor = this.next
            ? !this.next.is_dom_node() :
            !parent_node || !this.parent.is_dom_node();
        const snippet = this.node.expression.manipulate(block);
        block.chunks.init.push(b `let ${this.vars.each_block_value} = ${snippet};`);
        if (this.renderer.options.dev) {
            block.chunks.init.push(b `@validate_each_argument(${this.vars.each_block_value});`);
        }
        const initial_anchor_node = { type: 'Identifier', name: parent_node ? 'null' : '#anchor' };
        const initial_mount_node = parent_node || { type: 'Identifier', name: '#target' };
        const update_anchor_node = needs_anchor
            ? block.get_unique_name(`${this.var.name}_anchor`)
            : (this.next && this.next.var) || { type: 'Identifier', name: 'null' };
        const update_mount_node = this.get_update_mount_node(update_anchor_node);
        const args = {
            block,
            parent_node,
            parent_nodes,
            snippet,
            initial_anchor_node,
            initial_mount_node,
            update_anchor_node,
            update_mount_node
        };
        const all_dependencies = new Set(this.block.dependencies); // TODO should be dynamic deps only
        this.node.expression.dynamic_dependencies().forEach((dependency) => {
            all_dependencies.add(dependency);
        });
        if (this.node.key) {
            this.node.key.dynamic_dependencies().forEach((dependency) => {
                all_dependencies.add(dependency);
            });
        }
        this.dependencies = all_dependencies;
        if (this.node.key) {
            this.render_keyed(args);
        }
        else {
            this.render_unkeyed(args);
        }
        if (this.block.has_intro_method || this.block.has_outro_method) {
            block.chunks.intro.push(b `
				for (let #i = 0; #i < ${this.vars.data_length}; #i += 1) {
					@transition_in(${this.vars.iterations}[#i]);
				}
			`);
        }
        if (needs_anchor) {
            block.add_element(update_anchor_node, x `@empty()`, parent_nodes && x `@empty()`, parent_node);
        }
        if (this.else) {
            const each_block_else = component.get_unique_name(`${this.var.name}_else`);
            block.chunks.init.push(b `let ${each_block_else} = null;`);
            // TODO neaten this up... will end up with an empty line in the block
            block.chunks.init.push(b `
				if (!${this.vars.data_length}) {
					${each_block_else} = ${this.else.block.name}(#ctx);
				}
			`);
            block.chunks.create.push(b `
				if (${each_block_else}) {
					${each_block_else}.c();
				}
			`);
            if (this.renderer.options.hydratable) {
                block.chunks.claim.push(b `
					if (${each_block_else}) {
						${each_block_else}.l(${parent_nodes});
					}
				`);
            }
            block.chunks.mount.push(b `
				if (${each_block_else}) {
					${each_block_else}.m(${initial_mount_node}, ${initial_anchor_node});
				}
			`);
            const has_transitions = !!(this.else.block.has_intro_method || this.else.block.has_outro_method);
            const destroy_block_else = this.else.block.has_outro_method
                ? b `
					@group_outros();
					@transition_out(${each_block_else}, 1, 1, () => {
						${each_block_else} = null;
					});
					@check_outros();`
                : b `
					${each_block_else}.d(1);
					${each_block_else} = null;`;
            if (this.else.block.has_update_method) {
                this.updates.push(b `
					if (!${this.vars.data_length} && ${each_block_else}) {
						${each_block_else}.p(#ctx, #dirty);
					} else if (!${this.vars.data_length}) {
						${each_block_else} = ${this.else.block.name}(#ctx);
						${each_block_else}.c();
						${has_transitions && b `@transition_in(${each_block_else}, 1);`}
						${each_block_else}.m(${update_mount_node}, ${update_anchor_node});
					} else if (${each_block_else}) {
						${destroy_block_else};
					}
				`);
            }
            else {
                this.updates.push(b `
					if (${this.vars.data_length}) {
						if (${each_block_else}) {
							${destroy_block_else};
						}
					} else if (!${each_block_else}) {
						${each_block_else} = ${this.else.block.name}(#ctx);
						${each_block_else}.c();
						${has_transitions && b `@transition_in(${each_block_else}, 1);`}
						${each_block_else}.m(${update_mount_node}, ${update_anchor_node});
					}
				`);
            }
            block.chunks.destroy.push(b `
				if (${each_block_else}) ${each_block_else}.d(${parent_node ? '' : 'detaching'});
			`);
        }
        if (this.updates.length) {
            block.chunks.update.push(b `
				if (${block.renderer.dirty(Array.from(all_dependencies))}) {
					${this.updates}
				}
			`);
        }
        this.fragment.render(this.block, null, x `#nodes`);
        if (this.else) {
            this.else.fragment.render(this.else.block, null, x `#nodes`);
        }
        this.context_props = this.node.contexts.map(prop => b `child_ctx[${renderer.context_lookup.get(prop.key.name).index}] = ${prop.default_modifier(prop.modifier(x `list[i]`), name => renderer.context_lookup.has(name) ? x `child_ctx[${renderer.context_lookup.get(name).index}]` : { type: 'Identifier', name })};`);
        if (this.node.has_binding)
            this.context_props.push(b `child_ctx[${renderer.context_lookup.get(this.vars.each_block_value.name).index}] = list;`);
        if (this.node.has_binding || this.node.has_index_binding || this.node.index)
            this.context_props.push(b `child_ctx[${renderer.context_lookup.get(this.index_name.name).index}] = i;`);
        // TODO which is better — Object.create(array) or array.slice()?
        renderer.blocks.push(b `
			function ${this.vars.get_each_context}(#ctx, list, i) {
				const child_ctx = #ctx.slice();
				${this.context_props}
				return child_ctx;
			}
		`);
    }
    render_keyed({ block, parent_node, parent_nodes, snippet, initial_anchor_node, initial_mount_node, update_anchor_node, update_mount_node }) {
        const { create_each_block, iterations, data_length, view_length } = this.vars;
        const get_key = block.get_unique_name('get_key');
        const lookup = block.get_unique_name(`${this.var.name}_lookup`);
        block.add_variable(iterations, x `[]`);
        block.add_variable(lookup, x `new @_Map()`);
        if (this.fragment.nodes[0].is_dom_node()) {
            this.block.first = this.fragment.nodes[0].var;
        }
        else {
            this.block.first = this.block.get_unique_name('first');
            this.block.add_element(this.block.first, x `@empty()`, parent_nodes && x `@empty()`, null);
        }
        block.chunks.init.push(b `
			const ${get_key} = #ctx => ${this.node.key.manipulate(block)};

			${this.renderer.options.dev && b `@validate_each_keys(#ctx, ${this.vars.each_block_value}, ${this.vars.get_each_context}, ${get_key});`}
			for (let #i = 0; #i < ${data_length}; #i += 1) {
				let child_ctx = ${this.vars.get_each_context}(#ctx, ${this.vars.each_block_value}, #i);
				let key = ${get_key}(child_ctx);
				${lookup}.set(key, ${iterations}[#i] = ${create_each_block}(key, child_ctx));
			}
		`);
        block.chunks.create.push(b `
			for (let #i = 0; #i < ${view_length}; #i += 1) {
				${iterations}[#i].c();
			}
		`);
        if (parent_nodes && this.renderer.options.hydratable) {
            block.chunks.claim.push(b `
				for (let #i = 0; #i < ${view_length}; #i += 1) {
					${iterations}[#i].l(${parent_nodes});
				}
			`);
        }
        block.chunks.mount.push(b `
			for (let #i = 0; #i < ${view_length}; #i += 1) {
				${iterations}[#i].m(${initial_mount_node}, ${initial_anchor_node});
			}
		`);
        const dynamic = this.block.has_update_method;
        const destroy = this.node.has_animation
            ? (this.block.has_outros
                ? '@fix_and_outro_and_destroy_block'
                : '@fix_and_destroy_block')
            : this.block.has_outros
                ? '@outro_and_destroy_block'
                : '@destroy_block';
        if (this.dependencies.size) {
            this.block.maintain_context = true;
            this.updates.push(b `
				${this.vars.each_block_value} = ${snippet};
				${this.renderer.options.dev && b `@validate_each_argument(${this.vars.each_block_value});`}

				${this.block.has_outros && b `@group_outros();`}
				${this.node.has_animation && b `for (let #i = 0; #i < ${view_length}; #i += 1) ${iterations}[#i].r();`}
				${this.renderer.options.dev && b `@validate_each_keys(#ctx, ${this.vars.each_block_value}, ${this.vars.get_each_context}, ${get_key});`}
				${iterations} = @update_keyed_each(${iterations}, #dirty, ${get_key}, ${dynamic ? 1 : 0}, #ctx, ${this.vars.each_block_value}, ${lookup}, ${update_mount_node}, ${destroy}, ${create_each_block}, ${update_anchor_node}, ${this.vars.get_each_context});
				${this.node.has_animation && b `for (let #i = 0; #i < ${view_length}; #i += 1) ${iterations}[#i].a();`}
				${this.block.has_outros && b `@check_outros();`}
			`);
        }
        if (this.block.has_outros) {
            block.chunks.outro.push(b `
				for (let #i = 0; #i < ${view_length}; #i += 1) {
					@transition_out(${iterations}[#i]);
				}
			`);
        }
        block.chunks.destroy.push(b `
			for (let #i = 0; #i < ${view_length}; #i += 1) {
				${iterations}[#i].d(${parent_node ? null : 'detaching'});
			}
		`);
    }
    render_unkeyed({ block, parent_nodes, snippet, initial_anchor_node, initial_mount_node, update_anchor_node, update_mount_node }) {
        const { create_each_block, iterations, fixed_length, data_length, view_length } = this.vars;
        block.chunks.init.push(b `
			let ${iterations} = [];

			for (let #i = 0; #i < ${data_length}; #i += 1) {
				${iterations}[#i] = ${create_each_block}(${this.vars.get_each_context}(#ctx, ${this.vars.each_block_value}, #i));
			}
		`);
        block.chunks.create.push(b `
			for (let #i = 0; #i < ${view_length}; #i += 1) {
				${iterations}[#i].c();
			}
		`);
        if (parent_nodes && this.renderer.options.hydratable) {
            block.chunks.claim.push(b `
				for (let #i = 0; #i < ${view_length}; #i += 1) {
					${iterations}[#i].l(${parent_nodes});
				}
			`);
        }
        block.chunks.mount.push(b `
			for (let #i = 0; #i < ${view_length}; #i += 1) {
				${iterations}[#i].m(${initial_mount_node}, ${initial_anchor_node});
			}
		`);
        if (this.dependencies.size) {
            const has_transitions = !!(this.block.has_intro_method || this.block.has_outro_method);
            const for_loop_body = this.block.has_update_method
                ? b `
					if (${iterations}[#i]) {
						${iterations}[#i].p(child_ctx, #dirty);
						${has_transitions && b `@transition_in(${this.vars.iterations}[#i], 1);`}
					} else {
						${iterations}[#i] = ${create_each_block}(child_ctx);
						${iterations}[#i].c();
						${has_transitions && b `@transition_in(${this.vars.iterations}[#i], 1);`}
						${iterations}[#i].m(${update_mount_node}, ${update_anchor_node});
					}
				`
                : has_transitions
                    ? b `
						if (${iterations}[#i]) {
							@transition_in(${this.vars.iterations}[#i], 1);
						} else {
							${iterations}[#i] = ${create_each_block}(child_ctx);
							${iterations}[#i].c();
							@transition_in(${this.vars.iterations}[#i], 1);
							${iterations}[#i].m(${update_mount_node}, ${update_anchor_node});
						}
					`
                    : b `
						if (!${iterations}[#i]) {
							${iterations}[#i] = ${create_each_block}(child_ctx);
							${iterations}[#i].c();
							${iterations}[#i].m(${update_mount_node}, ${update_anchor_node});
						}
					`;
            const start = this.block.has_update_method ? 0 : '#old_length';
            let remove_old_blocks;
            if (this.block.has_outros) {
                const out = block.get_unique_name('out');
                block.chunks.init.push(b `
					const ${out} = i => @transition_out(${iterations}[i], 1, 1, () => {
						${iterations}[i] = null;
					});
				`);
                remove_old_blocks = b `
					@group_outros();
					for (#i = ${data_length}; #i < ${view_length}; #i += 1) {
						${out}(#i);
					}
					@check_outros();
				`;
            }
            else {
                remove_old_blocks = b `
					for (${this.block.has_update_method ? null : x `#i = ${data_length}`}; #i < ${this.block.has_update_method ? view_length : '#old_length'}; #i += 1) {
						${iterations}[#i].d(1);
					}
					${!fixed_length && b `${view_length} = ${data_length};`}
				`;
            }
            // We declare `i` as block scoped here, as the `remove_old_blocks` code
            // may rely on continuing where this iteration stopped.
            const update = b `
				${!this.block.has_update_method && b `const #old_length = ${this.vars.each_block_value}.length;`}
				${this.vars.each_block_value} = ${snippet};
				${this.renderer.options.dev && b `@validate_each_argument(${this.vars.each_block_value});`}

				let #i;
				for (#i = ${start}; #i < ${data_length}; #i += 1) {
					const child_ctx = ${this.vars.get_each_context}(#ctx, ${this.vars.each_block_value}, #i);

					${for_loop_body}
				}

				${remove_old_blocks}
			`;
            this.updates.push(update);
        }
        if (this.block.has_outros) {
            block.chunks.outro.push(b `
				${iterations} = ${iterations}.filter(@_Boolean);
				for (let #i = 0; #i < ${view_length}; #i += 1) {
					@transition_out(${iterations}[#i]);
				}
			`);
        }
        block.chunks.destroy.push(b `@destroy_each(${iterations}, detaching);`);
    }
}

function string_literal(data) {
    return {
        type: 'Literal',
        value: data
    };
}
const escaped = {
    '"': '&quot;',
    "'": '&#39;',
    '&': '&amp;',
    '<': '&lt;',
    '>': '&gt;'
};
function escape_html(html) {
    return String(html).replace(/["'&<>]/g, match => escaped[match]);
}
function escape_template(str) {
    return str.replace(/(\${|`|\\)/g, '\\$1');
}

class TextWrapper extends Wrapper {
    constructor(renderer, block, parent, node, data) {
        super(renderer, block, parent, node);
        this.skip = this.node.should_skip();
        this.data = data;
        this.var = (this.skip ? null : x `t`);
    }
    use_space() {
        if (this.renderer.component.component_options.preserveWhitespace)
            return false;
        if (/[\S\u00A0]/.test(this.data))
            return false;
        let node = this.parent && this.parent.node;
        while (node) {
            if (node.type === 'Element' && node.name === 'pre') {
                return false;
            }
            node = node.parent;
        }
        return true;
    }
    render(block, parent_node, parent_nodes) {
        if (this.skip)
            return;
        const use_space = this.use_space();
        block.add_element(this.var, use_space ? x `@space()` : x `@text("${this.data}")`, parent_nodes && (use_space ? x `@claim_space(${parent_nodes})` : x `@claim_text(${parent_nodes}, "${this.data}")`), parent_node);
    }
}

const svg_attributes = 'accent-height accumulate additive alignment-baseline allowReorder alphabetic amplitude arabic-form ascent attributeName attributeType autoReverse azimuth baseFrequency baseline-shift baseProfile bbox begin bias by calcMode cap-height class clip clipPathUnits clip-path clip-rule color color-interpolation color-interpolation-filters color-profile color-rendering contentScriptType contentStyleType cursor cx cy d decelerate descent diffuseConstant direction display divisor dominant-baseline dur dx dy edgeMode elevation enable-background end exponent externalResourcesRequired fill fill-opacity fill-rule filter filterRes filterUnits flood-color flood-opacity font-family font-size font-size-adjust font-stretch font-style font-variant font-weight format from fr fx fy g1 g2 glyph-name glyph-orientation-horizontal glyph-orientation-vertical glyphRef gradientTransform gradientUnits hanging height href horiz-adv-x horiz-origin-x id ideographic image-rendering in in2 intercept k k1 k2 k3 k4 kernelMatrix kernelUnitLength kerning keyPoints keySplines keyTimes lang lengthAdjust letter-spacing lighting-color limitingConeAngle local marker-end marker-mid marker-start markerHeight markerUnits markerWidth mask maskContentUnits maskUnits mathematical max media method min mode name numOctaves offset onabort onactivate onbegin onclick onend onerror onfocusin onfocusout onload onmousedown onmousemove onmouseout onmouseover onmouseup onrepeat onresize onscroll onunload opacity operator order orient orientation origin overflow overline-position overline-thickness panose-1 paint-order pathLength patternContentUnits patternTransform patternUnits pointer-events points pointsAtX pointsAtY pointsAtZ preserveAlpha preserveAspectRatio primitiveUnits r radius refX refY rendering-intent repeatCount repeatDur requiredExtensions requiredFeatures restart result rotate rx ry scale seed shape-rendering slope spacing specularConstant specularExponent speed spreadMethod startOffset stdDeviation stemh stemv stitchTiles stop-color stop-opacity strikethrough-position strikethrough-thickness string stroke stroke-dasharray stroke-dashoffset stroke-linecap stroke-linejoin stroke-miterlimit stroke-opacity stroke-width style surfaceScale systemLanguage tabindex tableValues target targetX targetY text-anchor text-decoration text-rendering textLength to transform type u1 u2 underline-position underline-thickness unicode unicode-bidi unicode-range units-per-em v-alphabetic v-hanging v-ideographic v-mathematical values version vert-adv-y vert-origin-x vert-origin-y viewBox viewTarget visibility width widths word-spacing writing-mode x x-height x1 x2 xChannelSelector xlink:actuate xlink:arcrole xlink:href xlink:role xlink:show xlink:title xlink:type xml:base xml:lang xml:space y y1 y2 yChannelSelector z zoomAndPan'.split(' ');
const svg_attribute_lookup = new Map();
svg_attributes.forEach(name => {
    svg_attribute_lookup.set(name.toLowerCase(), name);
});
function fix_attribute_casing(name) {
    name = name.toLowerCase();
    return svg_attribute_lookup.get(name) || name;
}

// The `foreign` namespace covers all DOM implementations that aren't HTML5.
// It opts out of HTML5-specific a11y checks and case-insensitive attribute names.
const foreign = 'https://svelte.dev/docs#svelte_options';
const html = 'http://www.w3.org/1999/xhtml';
const mathml = 'http://www.w3.org/1998/Math/MathML';
const svg = 'http://www.w3.org/2000/svg';
const xlink = 'http://www.w3.org/1999/xlink';
const xml = 'http://www.w3.org/XML/1998/namespace';
const xmlns = 'http://www.w3.org/2000/xmlns';
const valid_namespaces = [
    'foreign',
    'html',
    'mathml',
    'svg',
    'xlink',
    'xml',
    'xmlns',
    foreign,
    html,
    mathml,
    svg,
    xlink,
    xml,
    xmlns
];
const namespaces = { foreign, html, mathml, svg, xlink, xml, xmlns };

function handle_select_value_binding(attr, dependencies) {
    const { parent } = attr;
    if (parent.node.name === 'select') {
        parent.select_binding_dependencies = dependencies;
        dependencies.forEach((prop) => {
            parent.renderer.component.indirect_dependencies.set(prop, new Set());
        });
    }
}

class BaseAttributeWrapper {
    constructor(parent, block, node) {
        this.node = node;
        this.parent = parent;
        if (node.dependencies.size > 0) {
            parent.cannot_use_innerhtml();
            parent.not_static_content();
            block.add_dependencies(node.dependencies);
        }
    }
    render(_block) { }
}
class AttributeWrapper extends BaseAttributeWrapper {
    constructor(parent, block, node) {
        super(parent, block, node);
        if (node.dependencies.size > 0) {
            // special case — <option value={foo}> — see below
            if (this.parent.node.name === 'option' && node.name === 'value') {
                let select = this.parent;
                while (select && (select.node.type !== 'Element' || select.node.name !== 'select')) {
                    // @ts-ignore todo: doublecheck this, but looks to be correct
                    select = select.parent;
                }
                if (select && select.select_binding_dependencies) {
                    select.select_binding_dependencies.forEach(prop => {
                        this.node.dependencies.forEach((dependency) => {
                            this.parent.renderer.component.indirect_dependencies.get(prop).add(dependency);
                        });
                    });
                }
            }
            if (node.name === 'value') {
                handle_select_value_binding(this, node.dependencies);
            }
        }
        if (this.parent.node.namespace == namespaces.foreign) {
            // leave attribute case alone for elements in the "foreign" namespace
            this.name = this.node.name;
            this.metadata = this.get_metadata();
            this.is_indirectly_bound_value = false;
            this.property_name = null;
            this.is_select_value_attribute = false;
            this.is_input_value = false;
        }
        else {
            this.name = fix_attribute_casing(this.node.name);
            this.metadata = this.get_metadata();
            this.is_indirectly_bound_value = is_indirectly_bound_value(this);
            this.property_name = this.is_indirectly_bound_value
                ? '__value'
                : this.metadata && this.metadata.property_name;
            this.is_select_value_attribute = this.name === 'value' && this.parent.node.name === 'select';
            this.is_input_value = this.name === 'value' && this.parent.node.name === 'input';
        }
        this.is_src = this.name === 'src'; // TODO retire this exception in favour of https://github.com/sveltejs/svelte/issues/3750
        this.should_cache = should_cache(this);
    }
    render(block) {
        const element = this.parent;
        const { name, property_name, should_cache, is_indirectly_bound_value } = this;
        // xlink is a special case... we could maybe extend this to generic
        // namespaced attributes but I'm not sure that's applicable in
        // HTML5?
        const method = /-/.test(element.node.name)
            ? '@set_custom_element_data'
            : name.slice(0, 6) === 'xlink:'
                ? '@xlink_attr'
                : '@attr';
        const is_legacy_input_type = element.renderer.component.compile_options.legacy && name === 'type' && this.parent.node.name === 'input';
        const dependencies = this.get_dependencies();
        const value = this.get_value(block);
        let updater;
        const init = this.get_init(block, value);
        if (is_legacy_input_type) {
            block.chunks.hydrate.push(b `@set_input_type(${element.var}, ${init});`);
            updater = b `@set_input_type(${element.var}, ${should_cache ? this.last : value});`;
        }
        else if (this.is_select_value_attribute) {
            // annoying special case
            const is_multiple_select = element.node.get_static_attribute_value('multiple');
            if (is_multiple_select) {
                updater = b `@select_options(${element.var}, ${value});`;
            }
            else {
                updater = b `@select_option(${element.var}, ${value});`;
            }
            block.chunks.mount.push(b `
				${updater}
			`);
        }
        else if (this.is_src) {
            block.chunks.hydrate.push(b `if (${element.var}.src !== ${init}) ${method}(${element.var}, "${name}", ${this.last});`);
            updater = b `${method}(${element.var}, "${name}", ${should_cache ? this.last : value});`;
        }
        else if (property_name) {
            block.chunks.hydrate.push(b `${element.var}.${property_name} = ${init};`);
            updater = block.renderer.options.dev
                ? b `@prop_dev(${element.var}, "${property_name}", ${should_cache ? this.last : value});`
                : b `${element.var}.${property_name} = ${should_cache ? this.last : value};`;
        }
        else {
            block.chunks.hydrate.push(b `${method}(${element.var}, "${name}", ${init});`);
            updater = b `${method}(${element.var}, "${name}", ${should_cache ? this.last : value});`;
        }
        if (is_indirectly_bound_value) {
            const update_value = b `${element.var}.value = ${element.var}.__value;`;
            block.chunks.hydrate.push(update_value);
            updater = b `
				${updater}
				${update_value};
			`;
        }
        if (dependencies.length > 0) {
            const condition = this.get_dom_update_conditions(block, block.renderer.dirty(dependencies));
            block.chunks.update.push(b `
				if (${condition}) {
					${updater}
				}`);
        }
        // special case – autofocus. has to be handled in a bit of a weird way
        if (this.node.is_true && name === 'autofocus') {
            block.autofocus = element.var;
        }
    }
    get_init(block, value) {
        this.last = this.should_cache && block.get_unique_name(`${this.parent.var.name}_${this.name.replace(/[^a-zA-Z_$]/g, '_')}_value`);
        if (this.should_cache)
            block.add_variable(this.last);
        return this.should_cache ? x `${this.last} = ${value}` : value;
    }
    get_dom_update_conditions(block, dependency_condition) {
        const { property_name, should_cache, last } = this;
        const element = this.parent;
        const value = this.get_value(block);
        let condition = dependency_condition;
        if (should_cache) {
            condition = this.is_src
                ? x `${condition} && (${element.var}.src !== (${last} = ${value}))`
                : x `${condition} && (${last} !== (${last} = ${value}))`;
        }
        if (this.is_input_value) {
            const type = element.node.get_static_attribute_value('type');
            if (type === null || type === '' || type === 'text' || type === 'email' || type === 'password') {
                condition = x `${condition} && ${element.var}.${property_name} !== ${should_cache ? last : value}`;
            }
        }
        if (block.has_outros) {
            condition = x `!#current || ${condition}`;
        }
        return condition;
    }
    get_dependencies() {
        const node_dependencies = this.node.get_dependencies();
        const dependencies = new Set(node_dependencies);
        node_dependencies.forEach((prop) => {
            const indirect_dependencies = this.parent.renderer.component.indirect_dependencies.get(prop);
            if (indirect_dependencies) {
                indirect_dependencies.forEach(indirect_dependency => {
                    dependencies.add(indirect_dependency);
                });
            }
        });
        return Array.from(dependencies);
    }
    get_metadata() {
        if (this.parent.node.namespace)
            return null;
        const metadata = attribute_lookup[this.name];
        if (metadata && metadata.applies_to && !metadata.applies_to.includes(this.parent.node.name))
            return null;
        return metadata;
    }
    get_value(block) {
        if (this.node.is_true) {
            if (this.metadata && boolean_attribute.has(this.metadata.property_name.toLowerCase())) {
                return x `true`;
            }
            return x `""`;
        }
        if (this.node.chunks.length === 0)
            return x `""`;
        // TODO some of this code is repeated in Tag.ts — would be good to
        // DRY it out if that's possible without introducing crazy indirection
        if (this.node.chunks.length === 1) {
            return this.node.chunks[0].type === 'Text'
                ? string_literal(this.node.chunks[0].data)
                : this.node.chunks[0].manipulate(block);
        }
        let value = this.node.name === 'class'
            ? this.get_class_name_text(block)
            : this.render_chunks(block).reduce((lhs, rhs) => x `${lhs} + ${rhs}`);
        // '{foo} {bar}' — treat as string concatenation
        if (this.node.chunks[0].type !== 'Text') {
            value = x `"" + ${value}`;
        }
        return value;
    }
    get_class_name_text(block) {
        const scoped_css = this.node.chunks.some((chunk) => chunk.synthetic);
        const rendered = this.render_chunks(block);
        if (scoped_css && rendered.length === 2) {
            // we have a situation like class={possiblyUndefined}
            rendered[0] = x `@null_to_empty(${rendered[0]})`;
        }
        return rendered.reduce((lhs, rhs) => x `${lhs} + ${rhs}`);
    }
    render_chunks(block) {
        return this.node.chunks.map((chunk) => {
            if (chunk.type === 'Text') {
                return string_literal(chunk.data);
            }
            return chunk.manipulate(block);
        });
    }
    stringify() {
        if (this.node.is_true)
            return '';
        const value = this.node.chunks;
        if (value.length === 0)
            return '=""';
        return `="${value.map(chunk => {
            return chunk.type === 'Text'
                ? chunk.data.replace(/"/g, '\\"')
                : `\${${chunk.manipulate()}}`;
        }).join('')}"`;
    }
}
// source: https://html.spec.whatwg.org/multipage/indices.html
const attribute_lookup = {
    allowfullscreen: { property_name: 'allowFullscreen', applies_to: ['iframe'] },
    allowpaymentrequest: { property_name: 'allowPaymentRequest', applies_to: ['iframe'] },
    async: { applies_to: ['script'] },
    autofocus: { applies_to: ['button', 'input', 'keygen', 'select', 'textarea'] },
    autoplay: { applies_to: ['audio', 'video'] },
    checked: { applies_to: ['input'] },
    controls: { applies_to: ['audio', 'video'] },
    default: { applies_to: ['track'] },
    defer: { applies_to: ['script'] },
    disabled: {
        applies_to: [
            'button',
            'fieldset',
            'input',
            'keygen',
            'optgroup',
            'option',
            'select',
            'textarea'
        ]
    },
    formnovalidate: { property_name: 'formNoValidate', applies_to: ['button', 'input'] },
    hidden: {},
    indeterminate: { applies_to: ['input'] },
    ismap: { property_name: 'isMap', applies_to: ['img'] },
    loop: { applies_to: ['audio', 'bgsound', 'video'] },
    multiple: { applies_to: ['input', 'select'] },
    muted: { applies_to: ['audio', 'video'] },
    nomodule: { property_name: 'noModule', applies_to: ['script'] },
    novalidate: { property_name: 'noValidate', applies_to: ['form'] },
    open: { applies_to: ['details', 'dialog'] },
    playsinline: { property_name: 'playsInline', applies_to: ['video'] },
    readonly: { property_name: 'readOnly', applies_to: ['input', 'textarea'] },
    required: { applies_to: ['input', 'select', 'textarea'] },
    reversed: { applies_to: ['ol'] },
    selected: { applies_to: ['option'] },
    value: {
        applies_to: [
            'button',
            'option',
            'input',
            'li',
            'meter',
            'progress',
            'param',
            'select',
            'textarea'
        ]
    }
};
Object.keys(attribute_lookup).forEach(name => {
    const metadata = attribute_lookup[name];
    if (!metadata.property_name)
        metadata.property_name = name;
});
// source: https://html.spec.whatwg.org/multipage/indices.html
const boolean_attribute = new Set([
    'allowfullscreen',
    'allowpaymentrequest',
    'async',
    'autofocus',
    'autoplay',
    'checked',
    'controls',
    'default',
    'defer',
    'disabled',
    'formnovalidate',
    'hidden',
    'ismap',
    'itemscope',
    'loop',
    'multiple',
    'muted',
    'nomodule',
    'novalidate',
    'open',
    'playsinline',
    'readonly',
    'required',
    'reversed',
    'selected'
]);
function should_cache(attribute) {
    return attribute.is_src || attribute.node.should_cache();
}
function is_indirectly_bound_value(attribute) {
    const element = attribute.parent;
    return attribute.name === 'value' &&
        (element.node.name === 'option' || // TODO check it's actually bound
            (element.node.name === 'input' &&
                element.node.bindings.some((binding) => /checked|group/.test(binding.name))));
}

class StyleAttributeWrapper extends AttributeWrapper {
    render(block) {
        const style_props = optimize_style(this.node.chunks);
        if (!style_props)
            return super.render(block);
        style_props.forEach((prop) => {
            let value;
            if (is_dynamic(prop.value)) {
                const prop_dependencies = new Set();
                value = prop.value
                    .map(chunk => {
                    if (chunk.type === 'Text') {
                        return string_literal(chunk.data);
                    }
                    else {
                        add_to_set(prop_dependencies, chunk.dynamic_dependencies());
                        return chunk.manipulate(block);
                    }
                })
                    .reduce((lhs, rhs) => x `${lhs} + ${rhs}`);
                // TODO is this necessary? style.setProperty always treats value as string, no?
                // if (prop.value.length === 1 || prop.value[0].type !== 'Text') {
                // 	value = x`"" + ${value}`;
                // }
                if (prop_dependencies.size) {
                    let condition = block.renderer.dirty(Array.from(prop_dependencies));
                    if (block.has_outros) {
                        condition = x `!#current || ${condition}`;
                    }
                    const update = b `
						if (${condition}) {
							@set_style(${this.parent.var}, "${prop.key}", ${value}, ${prop.important ? 1 : null});
						}`;
                    block.chunks.update.push(update);
                }
            }
            else {
                value = string_literal(prop.value[0].data);
            }
            block.chunks.hydrate.push(b `@set_style(${this.parent.var}, "${prop.key}", ${value}, ${prop.important ? 1 : null});`);
        });
    }
}
function optimize_style(value) {
    const props = [];
    let chunks = value.slice();
    while (chunks.length) {
        const chunk = chunks[0];
        if (chunk.type !== 'Text')
            return null;
        const key_match = /^\s*([\w-]+):\s*/.exec(chunk.data);
        if (!key_match)
            return null;
        const key = key_match[1];
        const offset = key_match.index + key_match[0].length;
        const remaining_data = chunk.data.slice(offset);
        if (remaining_data) {
            chunks[0] = {
                start: chunk.start + offset,
                end: chunk.end,
                type: 'Text',
                data: remaining_data
            };
        }
        else {
            chunks.shift();
        }
        const result = get_style_value(chunks);
        props.push({ key, value: result.value, important: result.important });
        chunks = result.chunks;
    }
    return props;
}
function get_style_value(chunks) {
    const value = [];
    let in_url = false;
    let quote_mark = null;
    let escaped = false;
    let closed = false;
    while (chunks.length && !closed) {
        const chunk = chunks.shift();
        if (chunk.type === 'Text') {
            let c = 0;
            while (c < chunk.data.length) {
                const char = chunk.data[c];
                if (escaped) {
                    escaped = false;
                }
                else if (char === '\\') {
                    escaped = true;
                }
                else if (char === quote_mark) {
                    quote_mark = null;
                }
                else if (char === '"' || char === "'") {
                    quote_mark = char;
                }
                else if (char === ')' && in_url) {
                    in_url = false;
                }
                else if (char === 'u' && chunk.data.slice(c, c + 4) === 'url(') {
                    in_url = true;
                }
                else if (char === ';' && !in_url && !quote_mark) {
                    closed = true;
                    break;
                }
                c += 1;
            }
            if (c > 0) {
                value.push({
                    type: 'Text',
                    start: chunk.start,
                    end: chunk.start + c,
                    data: chunk.data.slice(0, c)
                });
            }
            while (/[;\s]/.test(chunk.data[c]))
                c += 1;
            const remaining_data = chunk.data.slice(c);
            if (remaining_data) {
                chunks.unshift({
                    start: chunk.start + c,
                    end: chunk.end,
                    type: 'Text',
                    data: remaining_data
                });
                break;
            }
        }
        else {
            value.push(chunk);
        }
    }
    let important = false;
    const last_chunk = value[value.length - 1];
    if (last_chunk && last_chunk.type === 'Text' && /\s*!important\s*$/.test(last_chunk.data)) {
        important = true;
        last_chunk.data = last_chunk.data.replace(/\s*!important\s*$/, '');
        if (!last_chunk.data)
            value.pop();
    }
    return {
        chunks,
        value,
        important
    };
}
function is_dynamic(value) {
    return value.length > 1 || value[0].type !== 'Text';
}

class SpreadAttributeWrapper extends BaseAttributeWrapper {
}

function replace_object(node, replacement) {
    if (node.type === 'Identifier')
        return replacement;
    const ancestor = node;
    let parent;
    while (node.type === 'MemberExpression') {
        parent = node;
        node = node.object;
    }
    parent.object = replacement;
    return ancestor;
}

function flatten_reference(node) {
    const nodes = [];
    const parts = [];
    while (node.type === 'MemberExpression') {
        nodes.unshift(node.property);
        if (!node.computed) {
            parts.unshift(node.property.name);
        }
        else {
            const computed_property = to_string$1(node.property);
            if (computed_property) {
                parts.unshift(`[${computed_property}]`);
            }
        }
        node = node.object;
    }
    const name = node.type === 'Identifier'
        ? node.name
        : node.type === 'ThisExpression' ? 'this' : null;
    nodes.unshift(node);
    parts.unshift(name);
    return { name, nodes, parts };
}
function to_string$1(node) {
    switch (node.type) {
        case 'Literal':
            return String(node.value);
        case 'Identifier':
            return node.name;
    }
}

function mark_each_block_bindings(parent, binding) {
    // we need to ensure that the each block creates a context including
    // the list and the index, if they're not otherwise referenced
    binding.expression.references.forEach(name => {
        const each_block = parent.node.scope.get_owner(name);
        if (each_block) {
            each_block.has_binding = true;
        }
    });
    if (binding.name === 'group') {
        const add_index_binding = (name) => {
            const each_block = parent.node.scope.get_owner(name);
            if (each_block.type === 'EachBlock') {
                each_block.has_index_binding = true;
                for (const dep of each_block.expression.contextual_dependencies) {
                    add_index_binding(dep);
                }
            }
        };
        // for `<input bind:group={} >`, we make sure that all the each blocks creates context with `index`
        for (const name of binding.expression.contextual_dependencies) {
            add_index_binding(name);
        }
    }
}

class BindingWrapper {
    constructor(block, node, parent) {
        this.node = node;
        this.parent = parent;
        const { dependencies } = this.node.expression;
        block.add_dependencies(dependencies);
        // TODO does this also apply to e.g. `<input type='checkbox' bind:group='foo'>`?
        handle_select_value_binding(this, dependencies);
        if (node.is_contextual) {
            mark_each_block_bindings(this.parent, this.node);
        }
        this.object = get_object(this.node.expression.node).name;
        // view to model
        this.handler = get_event_handler(this, parent.renderer, block, this.object, this.node.raw_expression);
        this.snippet = this.node.expression.manipulate(block);
        this.is_readonly = this.node.is_readonly;
        this.needs_lock = this.node.name === 'currentTime'; // TODO others?
    }
    get_dependencies() {
        const dependencies = new Set(this.node.expression.dependencies);
        this.node.expression.dependencies.forEach((prop) => {
            const indirect_dependencies = this.parent.renderer.component.indirect_dependencies.get(prop);
            if (indirect_dependencies) {
                indirect_dependencies.forEach(indirect_dependency => {
                    dependencies.add(indirect_dependency);
                });
            }
        });
        return dependencies;
    }
    is_readonly_media_attribute() {
        return this.node.is_readonly_media_attribute();
    }
    render(block, lock) {
        if (this.is_readonly)
            return;
        const { parent } = this;
        const update_conditions = this.needs_lock ? [x `!${lock}`] : [];
        const mount_conditions = [];
        const dependency_array = Array.from(this.get_dependencies());
        if (dependency_array.length > 0) {
            update_conditions.push(block.renderer.dirty(dependency_array));
        }
        if (parent.node.name === 'input') {
            const type = parent.node.get_static_attribute_value('type');
            if (type === null ||
                type === '' ||
                type === 'text' ||
                type === 'email' ||
                type === 'password') {
                update_conditions.push(x `${parent.var}.${this.node.name} !== ${this.snippet}`);
            }
            else if (type === 'number') {
                update_conditions.push(x `@to_number(${parent.var}.${this.node.name}) !== ${this.snippet}`);
            }
        }
        // model to view
        let update_dom = get_dom_updater(parent, this);
        let mount_dom = update_dom;
        // special cases
        switch (this.node.name) {
            case 'group':
                {
                    const { binding_group, is_context, contexts, index, keypath } = get_binding_group(parent.renderer, this.node, block);
                    block.renderer.add_to_context('$$binding_groups');
                    if (is_context && !block.binding_group_initialised.has(keypath)) {
                        if (contexts.length > 1) {
                            let binding_group = x `${block.renderer.reference('$$binding_groups')}[${index}]`;
                            for (const name of contexts.slice(0, -1)) {
                                binding_group = x `${binding_group}[${block.renderer.reference(name)}]`;
                                block.chunks.init.push(b `${binding_group} = ${binding_group} || [];`);
                            }
                        }
                        block.chunks.init.push(b `${binding_group(true)} = [];`);
                        block.binding_group_initialised.add(keypath);
                    }
                    block.chunks.hydrate.push(b `${binding_group(true)}.push(${parent.var});`);
                    block.chunks.destroy.push(b `${binding_group(true)}.splice(${binding_group(true)}.indexOf(${parent.var}), 1);`);
                    break;
                }
            case 'textContent':
                update_conditions.push(x `${this.snippet} !== ${parent.var}.textContent`);
                mount_conditions.push(x `${this.snippet} !== void 0`);
                break;
            case 'innerHTML':
                update_conditions.push(x `${this.snippet} !== ${parent.var}.innerHTML`);
                mount_conditions.push(x `${this.snippet} !== void 0`);
                break;
            case 'currentTime':
                update_conditions.push(x `!@_isNaN(${this.snippet})`);
                mount_dom = null;
                break;
            case 'playbackRate':
            case 'volume':
                update_conditions.push(x `!@_isNaN(${this.snippet})`);
                mount_conditions.push(x `!@_isNaN(${this.snippet})`);
                break;
            case 'paused':
                {
                    // this is necessary to prevent audio restarting by itself
                    const last = block.get_unique_name(`${parent.var.name}_is_paused`);
                    block.add_variable(last, x `true`);
                    update_conditions.push(x `${last} !== (${last} = ${this.snippet})`);
                    update_dom = b `${parent.var}[${last} ? "pause" : "play"]();`;
                    mount_dom = null;
                    break;
                }
            case 'value':
                if (parent.node.get_static_attribute_value('type') === 'file') {
                    update_dom = null;
                    mount_dom = null;
                }
        }
        if (update_dom) {
            if (update_conditions.length > 0) {
                const condition = update_conditions.reduce((lhs, rhs) => x `${lhs} && ${rhs}`);
                block.chunks.update.push(b `
					if (${condition}) {
						${update_dom}
					}
				`);
            }
            else {
                block.chunks.update.push(update_dom);
            }
        }
        if (mount_dom) {
            if (mount_conditions.length > 0) {
                const condition = mount_conditions.reduce((lhs, rhs) => x `${lhs} && ${rhs}`);
                block.chunks.mount.push(b `
					if (${condition}) {
						${mount_dom}
					}
				`);
            }
            else {
                block.chunks.mount.push(mount_dom);
            }
        }
    }
}
function get_dom_updater(element, binding) {
    const { node } = element;
    if (binding.is_readonly_media_attribute()) {
        return null;
    }
    if (binding.node.name === 'this') {
        return null;
    }
    if (node.name === 'select') {
        return node.get_static_attribute_value('multiple') === true ?
            b `@select_options(${element.var}, ${binding.snippet})` :
            b `@select_option(${element.var}, ${binding.snippet})`;
    }
    if (binding.node.name === 'group') {
        const type = node.get_static_attribute_value('type');
        const condition = type === 'checkbox'
            ? x `~${binding.snippet}.indexOf(${element.var}.__value)`
            : x `${element.var}.__value === ${binding.snippet}`;
        return b `${element.var}.checked = ${condition};`;
    }
    if (binding.node.name === 'value') {
        return b `@set_input_value(${element.var}, ${binding.snippet});`;
    }
    return b `${element.var}.${binding.node.name} = ${binding.snippet};`;
}
function get_binding_group(renderer, value, block) {
    const { parts } = flatten_reference(value.raw_expression);
    let keypath = parts.join('.');
    const contexts = [];
    const contextual_dependencies = new Set();
    const { template_scope } = value.expression;
    const add_contextual_dependency = (dep) => {
        contextual_dependencies.add(dep);
        const owner = template_scope.get_owner(dep);
        if (owner.type === 'EachBlock') {
            for (const dep of owner.expression.contextual_dependencies) {
                add_contextual_dependency(dep);
            }
        }
    };
    for (const dep of value.expression.contextual_dependencies) {
        add_contextual_dependency(dep);
    }
    for (const dep of contextual_dependencies) {
        const context = block.bindings.get(dep);
        let key;
        let name;
        if (context) {
            key = context.object.name;
            name = context.property.name;
        }
        else {
            key = dep;
            name = dep;
        }
        keypath = `${key}@${keypath}`;
        contexts.push(name);
    }
    if (!renderer.binding_groups.has(keypath)) {
        const index = renderer.binding_groups.size;
        contexts.forEach(context => {
            renderer.add_to_context(context, true);
        });
        renderer.binding_groups.set(keypath, {
            binding_group: (to_reference = false) => {
                let binding_group = '$$binding_groups';
                let _secondary_indexes = contexts;
                if (to_reference) {
                    binding_group = block.renderer.reference(binding_group);
                    _secondary_indexes = _secondary_indexes.map(name => block.renderer.reference(name));
                }
                if (_secondary_indexes.length > 0) {
                    let obj = x `${binding_group}[${index}]`;
                    _secondary_indexes.forEach(secondary_index => {
                        obj = x `${obj}[${secondary_index}]`;
                    });
                    return obj;
                }
                else {
                    return x `${binding_group}[${index}]`;
                }
            },
            is_context: contexts.length > 0,
            contexts,
            index,
            keypath
        });
    }
    return renderer.binding_groups.get(keypath);
}
function get_event_handler(binding, renderer, block, name, lhs) {
    const contextual_dependencies = new Set(binding.node.expression.contextual_dependencies);
    const context = block.bindings.get(name);
    let set_store;
    if (context) {
        const { object, property, store, snippet } = context;
        lhs = replace_object(lhs, snippet);
        contextual_dependencies.add(object.name);
        contextual_dependencies.add(property.name);
        contextual_dependencies.delete(name);
        if (store) {
            set_store = b `${store}.set(${`$${store}`});`;
        }
    }
    else {
        const object = get_object(lhs);
        if (object.name[0] === '$') {
            const store = object.name.slice(1);
            set_store = b `${store}.set(${object.name});`;
        }
    }
    const value = get_value_from_dom(renderer, binding.parent, binding, block, contextual_dependencies);
    const mutation = b `
		${lhs} = ${value};
		${set_store}
	`;
    return {
        uses_context: binding.node.is_contextual || binding.node.expression.uses_context,
        mutation,
        contextual_dependencies,
        lhs
    };
}
function get_value_from_dom(renderer, element, binding, block, contextual_dependencies) {
    const { node } = element;
    const { name } = binding.node;
    if (name === 'this') {
        return x `$$value`;
    }
    // <select bind:value='selected>
    if (node.name === 'select') {
        return node.get_static_attribute_value('multiple') === true ?
            x `@select_multiple_value(this)` :
            x `@select_value(this)`;
    }
    const type = node.get_static_attribute_value('type');
    // <input type='checkbox' bind:group='foo'>
    if (name === 'group') {
        if (type === 'checkbox') {
            const { binding_group, contexts } = get_binding_group(renderer, binding.node, block);
            add_to_set(contextual_dependencies, contexts);
            return x `@get_binding_group_value(${binding_group()}, this.__value, this.checked)`;
        }
        return x `this.__value`;
    }
    // <input type='range|number' bind:value>
    if (type === 'range' || type === 'number') {
        return x `@to_number(this.${name})`;
    }
    if ((name === 'buffered' || name === 'seekable' || name === 'played')) {
        return x `@time_ranges_to_array(this.${name})`;
    }
    // everything else
    return x `this.${name}`;
}

const reserved_keywords = new Set(['$$props', '$$restProps', '$$slots']);
function is_reserved_keyword(name) {
    return reserved_keywords.has(name);
}

function is_contextual(component, scope, name) {
    if (is_reserved_keyword(name))
        return true;
    // if it's a name below root scope, it's contextual
    if (!scope.is_top_level(name))
        return true;
    const variable = component.var_lookup.get(name);
    // hoistables, module declarations, and imports are non-contextual
    if (!variable || variable.hoistable)
        return false;
    // assume contextual
    return true;
}

function add_actions(block, target, actions) {
    actions.forEach(action => add_action(block, target, action));
}
function add_action(block, target, action) {
    const { expression, template_scope } = action;
    let snippet;
    let dependencies;
    if (expression) {
        snippet = expression.manipulate(block);
        dependencies = expression.dynamic_dependencies();
    }
    const id = block.get_unique_name(`${action.name.replace(/[^a-zA-Z0-9_$]/g, '_')}_action`);
    block.add_variable(id);
    const [obj, ...properties] = action.name.split('.');
    const fn = is_contextual(action.component, template_scope, obj)
        ? block.renderer.reference(obj)
        : obj;
    if (properties.length) {
        const member_expression = properties.reduce((lhs, rhs) => x `${lhs}.${rhs}`, fn);
        block.event_listeners.push(x `@action_destroyer(${id} = ${member_expression}(${target}, ${snippet}))`);
    }
    else {
        block.event_listeners.push(x `@action_destroyer(${id} = ${fn}.call(null, ${target}, ${snippet}))`);
    }
    if (dependencies && dependencies.length > 0) {
        let condition = x `${id} && @is_function(${id}.update)`;
        if (dependencies.length > 0) {
            condition = x `${condition} && ${block.renderer.dirty(dependencies)}`;
        }
        block.chunks.update.push(b `if (${condition}) ${id}.update.call(null, ${snippet});`);
    }
}

function compare_node(a, b) {
    if (a === b)
        return true;
    if (!a || !b)
        return false;
    if (a.type !== b.type)
        return false;
    switch (a.type) {
        case 'Identifier':
            return a.name === b.name;
        case 'MemberExpression':
            return (compare_node(a.object, b.object) &&
                compare_node(a.property, b.property) &&
                a.computed === b.computed);
        case 'Literal':
            return a.value === b.value;
    }
}

function bind_this(component, block, binding, variable) {
    const fn = component.get_unique_name(`${variable.name}_binding`);
    block.renderer.add_to_context(fn.name);
    const callee = block.renderer.reference(fn.name);
    const { contextual_dependencies, mutation } = binding.handler;
    const dependencies = binding.get_dependencies();
    const body = b `
		${mutation}
		${Array.from(dependencies)
        .filter(dep => dep[0] !== '$')
        .filter(dep => !contextual_dependencies.has(dep))
        .map(dep => b `${block.renderer.invalidate(dep)};`)}
	`;
    if (contextual_dependencies.size) {
        const params = Array.from(contextual_dependencies).map(name => ({
            type: 'Identifier',
            name
        }));
        component.partly_hoisted.push(b `
			function ${fn}($$value, ${params}) {
				@binding_callbacks[$$value ? 'unshift' : 'push'](() => {
					${body}
				});
			}
		`);
        const alias_map = new Map();
        const args = [];
        for (let id of params) {
            const value = block.renderer.reference(id.name);
            let found = false;
            if (block.variables.has(id.name)) {
                let alias = id.name;
                for (let i = 1; block.variables.has(alias) && !compare_node(block.variables.get(alias).init, value); alias = `${id.name}_${i++}`)
                    ;
                alias_map.set(alias, id.name);
                id = { type: 'Identifier', name: alias };
                found = block.variables.has(alias);
            }
            args.push(id);
            if (!found) {
                block.add_variable(id, value);
            }
        }
        const assign = block.get_unique_name(`assign_${variable.name}`);
        const unassign = block.get_unique_name(`unassign_${variable.name}`);
        block.chunks.init.push(b `
			const ${assign} = () => ${callee}(${variable}, ${args});
			const ${unassign} = () => ${callee}(null, ${args});
		`);
        const condition = Array.from(args)
            .map(name => x `${name} !== ${block.renderer.reference(alias_map.get(name.name) || name.name)}`)
            .reduce((lhs, rhs) => x `${lhs} || ${rhs}`);
        // we push unassign and unshift assign so that references are
        // nulled out before they're created, to avoid glitches
        // with shifting indices
        block.chunks.update.push(b `
			if (${condition}) {
				${unassign}();
				${args.map(a => b `${a} = ${block.renderer.reference(alias_map.get(a.name) || a.name)}`)};
				${assign}();
			}`);
        block.chunks.destroy.push(b `${unassign}();`);
        return b `${assign}();`;
    }
    component.partly_hoisted.push(b `
		function ${fn}($$value) {
			@binding_callbacks[$$value ? 'unshift' : 'push'](() => {
				${body}
			});
		}
	`);
    block.chunks.destroy.push(b `${callee}(null);`);
    return b `${callee}(${variable});`;
}

class Node$1 {
    constructor(component, parent, _scope, info) {
        this.start = info.start;
        this.end = info.end;
        this.type = info.type;
        // this makes properties non-enumerable, which makes logging
        // bearable. might have a performance cost. TODO remove in prod?
        Object.defineProperties(this, {
            component: {
                value: component
            },
            parent: {
                value: parent
            }
        });
    }
    cannot_use_innerhtml() {
        if (this.can_use_innerhtml !== false) {
            this.can_use_innerhtml = false;
            if (this.parent)
                this.parent.cannot_use_innerhtml();
        }
    }
    find_nearest(selector) {
        if (selector.test(this.type))
            return this;
        if (this.parent)
            return this.parent.find_nearest(selector);
    }
    get_static_attribute_value(name) {
        const attribute = this.attributes && this.attributes.find((attr) => attr.type === 'Attribute' && attr.name.toLowerCase() === name);
        if (!attribute)
            return null;
        if (attribute.is_true)
            return true;
        if (attribute.chunks.length === 0)
            return '';
        if (attribute.chunks.length === 1 && attribute.chunks[0].type === 'Text') {
            return attribute.chunks[0].data;
        }
        return null;
    }
    has_ancestor(type) {
        return this.parent ?
            this.parent.type === type || this.parent.has_ancestor(type) :
            false;
    }
}

function create_scopes(expression) {
    return analyze(expression);
}

function is_dynamic$1(variable) {
    if (variable) {
        if (variable.mutated || variable.reassigned)
            return true; // dynamic internal state
        if (!variable.module && variable.writable && variable.export_name)
            return true; // writable props
        if (is_reserved_keyword(variable.name))
            return true;
    }
    return false;
}

function nodes_match(a, b) {
    if (!!a !== !!b)
        return false;
    if (Array.isArray(a) !== Array.isArray(b))
        return false;
    if (a && typeof a === 'object') {
        if (Array.isArray(a)) {
            if (a.length !== b.length)
                return false;
            return a.every((child, i) => nodes_match(child, b[i]));
        }
        const a_keys = Object.keys(a).sort();
        const b_keys = Object.keys(b).sort();
        if (a_keys.length !== b_keys.length)
            return false;
        let i = a_keys.length;
        while (i--) {
            const key = a_keys[i];
            if (b_keys[i] !== key)
                return false;
            if (key === 'start' || key === 'end')
                continue;
            if (!nodes_match(a[key], b[key])) {
                return false;
            }
        }
        return true;
    }
    return a === b;
}

function invalidate(renderer, scope, node, names, main_execution_context = false) {
    const { component } = renderer;
    const [head, ...tail] = Array.from(names)
        .filter(name => {
        const owner = scope.find_owner(name);
        return !owner || owner === component.instance_scope;
    })
        .map(name => component.var_lookup.get(name))
        .filter(variable => {
        return variable && (!variable.hoistable &&
            !variable.global &&
            !variable.module &&
            (variable.referenced ||
                variable.subscribable ||
                variable.is_reactive_dependency ||
                variable.export_name ||
                variable.name[0] === '$'));
    });
    function get_invalidated(variable, node) {
        if (main_execution_context && !variable.subscribable && variable.name[0] !== '$') {
            return node;
        }
        return renderer_invalidate(renderer, variable.name, undefined, main_execution_context);
    }
    if (!head) {
        return node;
    }
    component.has_reactive_assignments = true;
    if (node.type === 'AssignmentExpression' && node.operator === '=' && nodes_match(node.left, node.right) && tail.length === 0) {
        return get_invalidated(head, node);
    }
    const is_store_value = head.name[0] === '$' && head.name[1] !== '$';
    const extra_args = tail.map(variable => get_invalidated(variable)).filter(Boolean);
    if (is_store_value) {
        return x `@set_store_value(${head.name.slice(1)}, ${node}, ${head.name}, ${extra_args})`;
    }
    let invalidate;
    if (!main_execution_context) {
        const pass_value = (extra_args.length > 0 ||
            (node.type === 'AssignmentExpression' && node.left.type !== 'Identifier') ||
            (node.type === 'UpdateExpression' && (!node.prefix || node.argument.type !== 'Identifier')));
        if (pass_value) {
            extra_args.unshift({
                type: 'Identifier',
                name: head.name
            });
        }
        invalidate = x `$$invalidate(${renderer.context_lookup.get(head.name).index}, ${node}, ${extra_args})`;
    }
    else {
        // skip `$$invalidate` if it is in the main execution context
        invalidate = extra_args.length ? [node, ...extra_args] : node;
    }
    if (head.subscribable && head.reassigned) {
        const subscribe = `$$subscribe_${head.name}`;
        invalidate = x `${subscribe}(${invalidate})`;
    }
    return invalidate;
}
function renderer_invalidate(renderer, name, value, main_execution_context = false) {
    const variable = renderer.component.var_lookup.get(name);
    if (variable && (variable.subscribable && (variable.reassigned || variable.export_name))) {
        if (main_execution_context) {
            return x `${`$$subscribe_${name}`}(${value || name})`;
        }
        else {
            const member = renderer.context_lookup.get(name);
            return x `${`$$subscribe_${name}`}($$invalidate(${member.index}, ${value || name}))`;
        }
    }
    if (name[0] === '$' && name[1] !== '$') {
        return x `${name.slice(1)}.set(${value || name})`;
    }
    if (variable && (variable.module || (!variable.referenced &&
        !variable.is_reactive_dependency &&
        !variable.export_name &&
        !name.startsWith('$$')))) {
        return value || name;
    }
    if (value) {
        if (main_execution_context) {
            return x `${value}`;
        }
        else {
            const member = renderer.context_lookup.get(name);
            return x `$$invalidate(${member.index}, ${value})`;
        }
    }
    if (main_execution_context)
        return;
    // if this is a reactive declaration, invalidate dependencies recursively
    const deps = new Set([name]);
    deps.forEach(name => {
        const reactive_declarations = renderer.component.reactive_declarations.filter(x => x.assignees.has(name));
        reactive_declarations.forEach(declaration => {
            declaration.dependencies.forEach(name => {
                deps.add(name);
            });
        });
    });
    // TODO ideally globals etc wouldn't be here in the first place
    const filtered = Array.from(deps).filter(n => renderer.context_lookup.has(n));
    if (!filtered.length)
        return null;
    return filtered
        .map(n => x `$$invalidate(${renderer.context_lookup.get(n).index}, ${n})`)
        .reduce((lhs, rhs) => x `${lhs}, ${rhs}`);
}

class Expression {
    constructor(component, owner, template_scope, info, lazy) {
        this.type = 'Expression';
        this.references = new Set();
        this.dependencies = new Set();
        this.contextual_dependencies = new Set();
        this.declarations = [];
        this.uses_context = false;
        // TODO revert to direct property access in prod?
        Object.defineProperties(this, {
            component: {
                value: component
            }
        });
        this.node = info;
        this.template_scope = template_scope;
        this.owner = owner;
        const { dependencies, contextual_dependencies, references } = this;
        let { map, scope } = create_scopes(info);
        this.scope = scope;
        this.scope_map = map;
        const expression = this;
        let function_expression;
        // discover dependencies, but don't change the code yet
        walk(info, {
            enter(node, parent, key) {
                // don't manipulate shorthand props twice
                if (key === 'value' && parent.shorthand)
                    return;
                // don't manipulate `import.meta`, `new.target`
                if (node.type === 'MetaProperty')
                    return this.skip();
                if (map.has(node)) {
                    scope = map.get(node);
                }
                if (!function_expression && /FunctionExpression/.test(node.type)) {
                    function_expression = node;
                }
                if (isReference(node, parent)) {
                    const { name, nodes } = flatten_reference(node);
                    references.add(name);
                    if (scope.has(name))
                        return;
                    if (name[0] === '$') {
                        const store_name = name.slice(1);
                        if (template_scope.names.has(store_name) || scope.has(store_name)) {
                            component.error(node, {
                                code: 'contextual-store',
                                message: 'Stores must be declared at the top level of the component (this may change in a future version of Svelte)'
                            });
                        }
                    }
                    if (template_scope.is_let(name)) {
                        if (!function_expression) { // TODO should this be `!lazy` ?
                            contextual_dependencies.add(name);
                            dependencies.add(name);
                        }
                    }
                    else if (template_scope.names.has(name)) {
                        expression.uses_context = true;
                        contextual_dependencies.add(name);
                        const owner = template_scope.get_owner(name);
                        const is_index = owner.type === 'EachBlock' && owner.key && name === owner.index;
                        if (!lazy || is_index) {
                            template_scope.dependencies_for_name.get(name).forEach(name => dependencies.add(name));
                        }
                    }
                    else {
                        if (!lazy) {
                            dependencies.add(name);
                        }
                        component.add_reference(name);
                        component.warn_if_undefined(name, nodes[0], template_scope);
                    }
                    this.skip();
                }
                // track any assignments from template expressions as mutable
                let names;
                let deep = false;
                if (function_expression) {
                    if (node.type === 'AssignmentExpression') {
                        deep = node.left.type === 'MemberExpression';
                        names = extract_names(deep ? get_object(node.left) : node.left);
                    }
                    else if (node.type === 'UpdateExpression') {
                        names = extract_names(get_object(node.argument));
                    }
                }
                if (names) {
                    names.forEach(name => {
                        if (template_scope.names.has(name)) {
                            template_scope.dependencies_for_name.get(name).forEach(name => {
                                const variable = component.var_lookup.get(name);
                                if (variable)
                                    variable[deep ? 'mutated' : 'reassigned'] = true;
                            });
                            const each_block = template_scope.get_owner(name);
                            each_block.has_binding = true;
                        }
                        else {
                            component.add_reference(name);
                            const variable = component.var_lookup.get(name);
                            if (variable)
                                variable[deep ? 'mutated' : 'reassigned'] = true;
                        }
                    });
                }
            },
            leave(node) {
                if (map.has(node)) {
                    scope = scope.parent;
                }
                if (node === function_expression) {
                    function_expression = null;
                }
            }
        });
    }
    dynamic_dependencies() {
        return Array.from(this.dependencies).filter(name => {
            if (this.template_scope.is_let(name))
                return true;
            if (is_reserved_keyword(name))
                return true;
            const variable = this.component.var_lookup.get(name);
            return is_dynamic$1(variable);
        });
    }
    // TODO move this into a render-dom wrapper?
    manipulate(block) {
        // TODO ideally we wouldn't end up calling this method
        // multiple times
        if (this.manipulated)
            return this.manipulated;
        const { component, declarations, scope_map: map, template_scope, owner } = this;
        let scope = this.scope;
        let function_expression;
        let dependencies;
        let contextual_dependencies;
        const node = walk(this.node, {
            enter(node, parent) {
                if (node.type === 'Property' && node.shorthand) {
                    node.value = JSON.parse(JSON.stringify(node.value));
                    node.shorthand = false;
                }
                if (map.has(node)) {
                    scope = map.get(node);
                }
                if (node.type === 'Identifier' && isReference(node, parent)) {
                    const { name } = flatten_reference(node);
                    if (scope.has(name))
                        return;
                    if (function_expression) {
                        if (template_scope.names.has(name)) {
                            contextual_dependencies.add(name);
                            template_scope.dependencies_for_name.get(name).forEach(dependency => {
                                dependencies.add(dependency);
                            });
                        }
                        else {
                            dependencies.add(name);
                            component.add_reference(name); // TODO is this redundant/misplaced?
                        }
                    }
                    else if (is_contextual(component, template_scope, name)) {
                        const reference = block.renderer.reference(node);
                        this.replace(reference);
                    }
                    this.skip();
                }
                if (!function_expression) {
                    if (node.type === 'AssignmentExpression') ;
                    if (node.type === 'FunctionExpression' || node.type === 'ArrowFunctionExpression') {
                        function_expression = node;
                        dependencies = new Set();
                        contextual_dependencies = new Set();
                    }
                }
            },
            leave(node, parent) {
                if (map.has(node))
                    scope = scope.parent;
                if (node === function_expression) {
                    const id = component.get_unique_name(sanitize(get_function_name(node, owner)));
                    const declaration = b `const ${id} = ${node}`;
                    if (dependencies.size === 0 && contextual_dependencies.size === 0) {
                        // we can hoist this out of the component completely
                        component.fully_hoisted.push(declaration);
                        this.replace(id);
                        component.add_var({
                            name: id.name,
                            internal: true,
                            hoistable: true,
                            referenced: true
                        });
                    }
                    else if (contextual_dependencies.size === 0) {
                        // function can be hoisted inside the component init
                        component.partly_hoisted.push(declaration);
                        block.renderer.add_to_context(id.name);
                        this.replace(block.renderer.reference(id));
                    }
                    else {
                        // we need a combo block/init recipe
                        const deps = Array.from(contextual_dependencies);
                        const function_expression = node;
                        const has_args = function_expression.params.length > 0;
                        function_expression.params = [
                            ...deps.map(name => ({ type: 'Identifier', name })),
                            ...function_expression.params
                        ];
                        const context_args = deps.map(name => block.renderer.reference(name));
                        component.partly_hoisted.push(declaration);
                        block.renderer.add_to_context(id.name);
                        const callee = block.renderer.reference(id);
                        this.replace(id);
                        const func_declaration = has_args
                            ? b `function ${id}(...args) {
								return ${callee}(${context_args}, ...args);
							}`
                            : b `function ${id}() {
								return ${callee}(${context_args});
							}`;
                        if (owner.type === 'Attribute' && owner.parent.name === 'slot') {
                            const dep_scopes = new Set(deps.map(name => template_scope.get_owner(name)));
                            // find the nearest scopes
                            let node = owner.parent;
                            while (node && !dep_scopes.has(node)) {
                                node = node.parent;
                            }
                            const func_expression = func_declaration[0];
                            if (node.type === 'InlineComponent') {
                                // <Comp let:data />
                                this.replace(func_expression);
                            }
                            else {
                                // {#each}, {#await}
                                const func_id = component.get_unique_name(id.name + '_func');
                                block.renderer.add_to_context(func_id.name, true);
                                // rename #ctx -> child_ctx;
                                walk(func_expression, {
                                    enter(node) {
                                        if (node.type === 'Identifier' && node.name === '#ctx') {
                                            node.name = 'child_ctx';
                                        }
                                    }
                                });
                                // add to get_xxx_context
                                // child_ctx[x] = function () { ... }
                                template_scope.get_owner(deps[0]).contexts.push({
                                    key: func_id,
                                    modifier: () => func_expression,
                                    default_modifier: node => node
                                });
                                this.replace(block.renderer.reference(func_id));
                            }
                        }
                        else {
                            declarations.push(func_declaration);
                        }
                    }
                    function_expression = null;
                    dependencies = null;
                    contextual_dependencies = null;
                    if (parent && parent.type === 'Property') {
                        parent.method = false;
                    }
                }
                if (node.type === 'AssignmentExpression' || node.type === 'UpdateExpression') {
                    const assignee = node.type === 'AssignmentExpression' ? node.left : node.argument;
                    const object_name = get_object(assignee).name;
                    if (scope.has(object_name))
                        return;
                    // normally (`a = 1`, `b.c = 2`), there'll be a single name
                    // (a or b). In destructuring cases (`[d, e] = [e, d]`) there
                    // may be more, in which case we need to tack the extra ones
                    // onto the initial function call
                    const names = new Set(extract_names(assignee));
                    const traced = new Set();
                    names.forEach(name => {
                        const dependencies = template_scope.dependencies_for_name.get(name);
                        if (dependencies) {
                            dependencies.forEach(name => traced.add(name));
                        }
                        else {
                            traced.add(name);
                        }
                    });
                    const context = block.bindings.get(object_name);
                    if (context) {
                        // for `{#each array as item}`
                        // replace `item = 1` to `each_array[each_index] = 1`, this allow us to mutate the array
                        // rather than mutating the local `item` variable
                        const { snippet, object, property } = context;
                        const replaced = replace_object(assignee, snippet);
                        if (node.type === 'AssignmentExpression') {
                            node.left = replaced;
                        }
                        else {
                            node.argument = replaced;
                        }
                        contextual_dependencies.add(object.name);
                        contextual_dependencies.add(property.name);
                    }
                    this.replace(invalidate(block.renderer, scope, node, traced));
                }
            }
        });
        if (declarations.length > 0) {
            block.maintain_context = true;
            declarations.forEach(declaration => {
                block.chunks.init.push(declaration);
            });
        }
        return (this.manipulated = node);
    }
}
function get_function_name(_node, parent) {
    if (parent.type === 'EventHandler') {
        return `${parent.name}_handler`;
    }
    if (parent.type === 'Action') {
        return `${parent.name}_function`;
    }
    return 'func';
}

class Action extends Node$1 {
    constructor(component, parent, scope, info) {
        super(component, parent, scope, info);
        const object = info.name.split('.')[0];
        component.warn_if_undefined(object, info, scope);
        this.name = info.name;
        component.add_reference(object);
        this.expression = info.expression
            ? new Expression(component, this, scope, info.expression)
            : null;
        this.template_scope = scope;
        this.uses_context = this.expression && this.expression.uses_context;
    }
}

class Tag extends Wrapper {
    constructor(renderer, block, parent, node) {
        super(renderer, block, parent, node);
        this.cannot_use_innerhtml();
        if (!this.is_dependencies_static()) {
            this.not_static_content();
        }
        block.add_dependencies(node.expression.dependencies);
    }
    is_dependencies_static() {
        return this.node.expression.contextual_dependencies.size === 0 && this.node.expression.dynamic_dependencies().length === 0;
    }
    rename_this_method(block, update) {
        const dependencies = this.node.expression.dynamic_dependencies();
        let snippet = this.node.expression.manipulate(block);
        const value = this.node.should_cache && block.get_unique_name(`${this.var.name}_value`);
        const content = this.node.should_cache ? value : snippet;
        snippet = x `${snippet} + ""`;
        if (this.node.should_cache)
            block.add_variable(value, snippet); // TODO may need to coerce snippet to string
        if (dependencies.length > 0) {
            let condition = block.renderer.dirty(dependencies);
            if (block.has_outros) {
                condition = x `!#current || ${condition}`;
            }
            const update_cached_value = x `${value} !== (${value} = ${snippet})`;
            if (this.node.should_cache) {
                condition = x `${condition} && ${update_cached_value}`;
            }
            block.chunks.update.push(b `if (${condition}) ${update(content)}`);
        }
        return { init: content };
    }
}

class MustacheTagWrapper extends Tag {
    constructor(renderer, block, parent, node) {
        super(renderer, block, parent, node);
        this.var = { type: 'Identifier', name: 't' };
    }
    render(block, parent_node, parent_nodes) {
        const { init } = this.rename_this_method(block, value => x `@set_data(${this.var}, ${value})`);
        block.add_element(this.var, x `@text(${init})`, parent_nodes && x `@claim_text(${parent_nodes}, ${init})`, parent_node);
    }
}

class RawMustacheTagWrapper extends Tag {
    constructor(renderer, block, parent, node) {
        super(renderer, block, parent, node);
        this.var = { type: 'Identifier', name: 'raw' };
        this.cannot_use_innerhtml();
        this.not_static_content();
    }
    render(block, parent_node, _parent_nodes) {
        const in_head = is_head(parent_node);
        const can_use_innerhtml = !in_head && parent_node && !this.prev && !this.next;
        if (can_use_innerhtml) {
            const insert = content => b `${parent_node}.innerHTML = ${content};`[0];
            const { init } = this.rename_this_method(block, content => insert(content));
            block.chunks.mount.push(insert(init));
        }
        else {
            const needs_anchor = in_head || (this.next ? !this.next.is_dom_node() : (!this.parent || !this.parent.is_dom_node()));
            const html_tag = block.get_unique_name('html_tag');
            const html_anchor = needs_anchor && block.get_unique_name('html_anchor');
            block.add_variable(html_tag);
            const { init } = this.rename_this_method(block, content => x `${html_tag}.p(${content})`);
            const update_anchor = needs_anchor ? html_anchor : this.next ? this.next.var : 'null';
            block.chunks.hydrate.push(b `${html_tag} = new @HtmlTag(${update_anchor});`);
            block.chunks.mount.push(b `${html_tag}.m(${init}, ${parent_node || '#target'}, ${parent_node ? null : '#anchor'});`);
            if (needs_anchor) {
                block.add_element(html_anchor, x `@empty()`, x `@empty()`, parent_node);
            }
            if (!parent_node || in_head) {
                block.chunks.destroy.push(b `if (detaching) ${html_tag}.d();`);
            }
        }
    }
}

const events = [
    {
        event_names: ['input'],
        filter: (node, _name) => node.name === 'textarea' ||
            node.name === 'input' && !/radio|checkbox|range|file/.test(node.get_static_attribute_value('type'))
    },
    {
        event_names: ['input'],
        filter: (node, name) => (name === 'textContent' || name === 'innerHTML') &&
            node.attributes.some(attribute => attribute.name === 'contenteditable')
    },
    {
        event_names: ['change'],
        filter: (node, _name) => node.name === 'select' ||
            node.name === 'input' && /radio|checkbox|file/.test(node.get_static_attribute_value('type'))
    },
    {
        event_names: ['change', 'input'],
        filter: (node, _name) => node.name === 'input' && node.get_static_attribute_value('type') === 'range'
    },
    {
        event_names: ['elementresize'],
        filter: (_node, name) => dimensions.test(name)
    },
    // media events
    {
        event_names: ['timeupdate'],
        filter: (node, name) => node.is_media_node() &&
            (name === 'currentTime' || name === 'played' || name === 'ended')
    },
    {
        event_names: ['durationchange'],
        filter: (node, name) => node.is_media_node() &&
            name === 'duration'
    },
    {
        event_names: ['play', 'pause'],
        filter: (node, name) => node.is_media_node() &&
            name === 'paused'
    },
    {
        event_names: ['progress'],
        filter: (node, name) => node.is_media_node() &&
            name === 'buffered'
    },
    {
        event_names: ['loadedmetadata'],
        filter: (node, name) => node.is_media_node() &&
            (name === 'buffered' || name === 'seekable')
    },
    {
        event_names: ['volumechange'],
        filter: (node, name) => node.is_media_node() &&
            (name === 'volume' || name === 'muted')
    },
    {
        event_names: ['ratechange'],
        filter: (node, name) => node.is_media_node() &&
            name === 'playbackRate'
    },
    {
        event_names: ['seeking', 'seeked'],
        filter: (node, name) => node.is_media_node() &&
            (name === 'seeking')
    },
    {
        event_names: ['ended'],
        filter: (node, name) => node.is_media_node() &&
            name === 'ended'
    },
    {
        event_names: ['resize'],
        filter: (node, name) => node.is_media_node() &&
            (name === 'videoHeight' || name === 'videoWidth')
    },
    // details event
    {
        event_names: ['toggle'],
        filter: (node, _name) => node.name === 'details'
    }
];
class ElementWrapper extends Wrapper {
    constructor(renderer, block, parent, node, strip_whitespace, next_sibling) {
        super(renderer, block, parent, node);
        this.var = {
            type: 'Identifier',
            name: node.name.replace(/[^a-zA-Z0-9_$]/g, '_')
        };
        this.void = is_void(node.name);
        this.class_dependencies = [];
        if (this.node.children.length) {
            this.node.lets.forEach(l => {
                extract_names(l.value || l.name).forEach(name => {
                    renderer.add_to_context(name, true);
                });
            });
        }
        this.attributes = this.node.attributes.map(attribute => {
            if (attribute.name === 'style') {
                return new StyleAttributeWrapper(this, block, attribute);
            }
            if (attribute.type === 'Spread') {
                return new SpreadAttributeWrapper(this, block, attribute);
            }
            return new AttributeWrapper(this, block, attribute);
        });
        // ordinarily, there'll only be one... but we need to handle
        // the rare case where an element can have multiple bindings,
        // e.g. <audio bind:paused bind:currentTime>
        this.bindings = this.node.bindings.map(binding => new BindingWrapper(block, binding, this));
        this.event_handlers = this.node.handlers.map(event_handler => new EventHandlerWrapper(event_handler, this));
        if (node.intro || node.outro) {
            if (node.intro)
                block.add_intro(node.intro.is_local);
            if (node.outro)
                block.add_outro(node.outro.is_local);
        }
        if (node.animation) {
            block.add_animation();
        }
        // add directive and handler dependencies
        [node.animation, node.outro, ...node.actions, ...node.classes].forEach(directive => {
            if (directive && directive.expression) {
                block.add_dependencies(directive.expression.dependencies);
            }
        });
        node.handlers.forEach(handler => {
            if (handler.expression) {
                block.add_dependencies(handler.expression.dependencies);
            }
        });
        if (this.parent) {
            if (node.actions.length > 0 ||
                node.animation ||
                node.bindings.length > 0 ||
                node.classes.length > 0 ||
                node.intro || node.outro ||
                node.handlers.length > 0 ||
                this.node.name === 'option' ||
                renderer.options.dev) {
                this.parent.cannot_use_innerhtml(); // need to use add_location
                this.parent.not_static_content();
            }
        }
        this.fragment = new FragmentWrapper(renderer, block, node.children, this, strip_whitespace, next_sibling);
    }
    render(block, parent_node, parent_nodes) {
        const { renderer } = this;
        if (this.node.name === 'noscript')
            return;
        const node = this.var;
        const nodes = parent_nodes && block.get_unique_name(`${this.var.name}_nodes`); // if we're in unclaimable territory, i.e. <head>, parent_nodes is null
        const children = x `@children(${this.node.name === 'template' ? x `${node}.content` : node})`;
        block.add_variable(node);
        const render_statement = this.get_render_statement(block);
        block.chunks.create.push(b `${node} = ${render_statement};`);
        if (renderer.options.hydratable) {
            if (parent_nodes) {
                block.chunks.claim.push(b `
					${node} = ${this.get_claim_statement(parent_nodes)};
				`);
                if (!this.void && this.node.children.length > 0) {
                    block.chunks.claim.push(b `
						var ${nodes} = ${children};
					`);
                }
            }
            else {
                block.chunks.claim.push(b `${node} = ${render_statement};`);
            }
        }
        if (parent_node) {
            block.chunks.mount.push(b `@append(${parent_node}, ${node});`);
            if (is_head(parent_node)) {
                block.chunks.destroy.push(b `@detach(${node});`);
            }
        }
        else {
            block.chunks.mount.push(b `@insert(#target, ${node}, #anchor);`);
            // TODO we eventually need to consider what happens to elements
            // that belong to the same outgroup as an outroing element...
            block.chunks.destroy.push(b `if (detaching) @detach(${node});`);
        }
        // insert static children with textContent or innerHTML
        const can_use_textcontent = this.can_use_textcontent();
        if (!this.node.namespace && (this.can_use_innerhtml || can_use_textcontent) && this.fragment.nodes.length > 0) {
            if (this.fragment.nodes.length === 1 && this.fragment.nodes[0].node.type === 'Text') {
                block.chunks.create.push(b `${node}.textContent = ${string_literal(this.fragment.nodes[0].data)};`);
            }
            else {
                const state = {
                    quasi: {
                        type: 'TemplateElement',
                        value: { raw: '' }
                    }
                };
                const literal = {
                    type: 'TemplateLiteral',
                    expressions: [],
                    quasis: []
                };
                const can_use_raw_text = !this.can_use_innerhtml && can_use_textcontent;
                to_html(this.fragment.nodes, block, literal, state, can_use_raw_text);
                literal.quasis.push(state.quasi);
                block.chunks.create.push(b `${node}.${this.can_use_innerhtml ? 'innerHTML' : 'textContent'} = ${literal};`);
            }
        }
        else {
            this.fragment.nodes.forEach((child) => {
                child.render(block, this.node.name === 'template' ? x `${node}.content` : node, nodes);
            });
        }
        const event_handler_or_binding_uses_context = (this.bindings.some(binding => binding.handler.uses_context) ||
            this.node.handlers.some(handler => handler.uses_context) ||
            this.node.actions.some(action => action.uses_context));
        if (event_handler_or_binding_uses_context) {
            block.maintain_context = true;
        }
        this.add_attributes(block);
        this.add_directives_in_order(block);
        this.add_transitions(block);
        this.add_animation(block);
        this.add_classes(block);
        this.add_manual_style_scoping(block);
        if (nodes && this.renderer.options.hydratable && !this.void) {
            block.chunks.claim.push(b `${this.node.children.length > 0 ? nodes : children}.forEach(@detach);`);
        }
        if (renderer.options.dev) {
            const loc = renderer.locate(this.node.start);
            block.chunks.hydrate.push(b `@add_location(${this.var}, ${renderer.file_var}, ${loc.line - 1}, ${loc.column}, ${this.node.start});`);
        }
    }
    can_use_textcontent() {
        return this.is_static_content && this.fragment.nodes.every(node => node.node.type === 'Text' || node.node.type === 'MustacheTag');
    }
    get_render_statement(block) {
        const { name, namespace } = this.node;
        if (namespace === namespaces.svg) {
            return x `@svg_element("${name}")`;
        }
        if (namespace) {
            return x `@_document.createElementNS("${namespace}", "${name}")`;
        }
        const is = this.attributes.find(attr => attr.node.name === 'is');
        if (is) {
            return x `@element_is("${name}", ${is.render_chunks(block).reduce((lhs, rhs) => x `${lhs} + ${rhs}`)})`;
        }
        return x `@element("${name}")`;
    }
    get_claim_statement(nodes) {
        const attributes = this.node.attributes
            .filter((attr) => attr.type === 'Attribute')
            .map((attr) => p `${attr.name}: true`);
        const name = this.node.namespace
            ? this.node.name
            : this.node.name.toUpperCase();
        const svg = this.node.namespace === namespaces.svg ? 1 : null;
        return x `@claim_element(${nodes}, "${name}", { ${attributes} }, ${svg})`;
    }
    add_directives_in_order(block) {
        const binding_groups = events
            .map(event => ({
            events: event.event_names,
            bindings: this.bindings
                .filter(binding => binding.node.name !== 'this')
                .filter(binding => event.filter(this.node, binding.node.name))
        }))
            .filter(group => group.bindings.length);
        const this_binding = this.bindings.find(b => b.node.name === 'this');
        function getOrder(item) {
            if (item instanceof EventHandlerWrapper) {
                return item.node.start;
            }
            else if (item instanceof BindingWrapper) {
                return item.node.start;
            }
            else if (item instanceof Action) {
                return item.start;
            }
            else {
                return item.bindings[0].node.start;
            }
        }
        [
            ...binding_groups,
            ...this.event_handlers,
            this_binding,
            ...this.node.actions
        ]
            .filter(Boolean)
            .sort((a, b) => getOrder(a) - getOrder(b))
            .forEach(item => {
            if (item instanceof EventHandlerWrapper) {
                add_event_handler(block, this.var, item);
            }
            else if (item instanceof BindingWrapper) {
                this.add_this_binding(block, item);
            }
            else if (item instanceof Action) {
                add_action(block, this.var, item);
            }
            else {
                this.add_bindings(block, item);
            }
        });
    }
    add_bindings(block, binding_group) {
        const { renderer } = this;
        if (binding_group.bindings.length === 0)
            return;
        renderer.component.has_reactive_assignments = true;
        const lock = binding_group.bindings.some(binding => binding.needs_lock) ?
            block.get_unique_name(`${this.var.name}_updating`) :
            null;
        if (lock)
            block.add_variable(lock, x `false`);
        const handler = renderer.component.get_unique_name(`${this.var.name}_${binding_group.events.join('_')}_handler`);
        renderer.add_to_context(handler.name);
        // TODO figure out how to handle locks
        const needs_lock = binding_group.bindings.some(binding => binding.needs_lock);
        const dependencies = new Set();
        const contextual_dependencies = new Set();
        binding_group.bindings.forEach(binding => {
            // TODO this is a mess
            add_to_set(dependencies, binding.get_dependencies());
            add_to_set(contextual_dependencies, binding.handler.contextual_dependencies);
            binding.render(block, lock);
        });
        // media bindings — awkward special case. The native timeupdate events
        // fire too infrequently, so we need to take matters into our
        // own hands
        let animation_frame;
        if (binding_group.events[0] === 'timeupdate') {
            animation_frame = block.get_unique_name(`${this.var.name}_animationframe`);
            block.add_variable(animation_frame);
        }
        const has_local_function = contextual_dependencies.size > 0 || needs_lock || animation_frame;
        let callee = renderer.reference(handler);
        // TODO dry this out — similar code for event handlers and component bindings
        if (has_local_function) {
            const args = Array.from(contextual_dependencies).map(name => renderer.reference(name));
            // need to create a block-local function that calls an instance-level function
            if (animation_frame) {
                block.chunks.init.push(b `
					function ${handler}() {
						@_cancelAnimationFrame(${animation_frame});
						if (!${this.var}.paused) {
							${animation_frame} = @raf(${handler});
							${needs_lock && b `${lock} = true;`}
						}
						${callee}.call(${this.var}, ${args});
					}
				`);
            }
            else {
                block.chunks.init.push(b `
					function ${handler}() {
						${needs_lock && b `${lock} = true;`}
						${callee}.call(${this.var}, ${args});
					}
				`);
            }
            callee = handler;
        }
        const params = Array.from(contextual_dependencies).map(name => ({
            type: 'Identifier',
            name
        }));
        this.renderer.component.partly_hoisted.push(b `
			function ${handler}(${params}) {
				${binding_group.bindings.map(b => b.handler.mutation)}
				${Array.from(dependencies)
            .filter(dep => dep[0] !== '$')
            .filter(dep => !contextual_dependencies.has(dep))
            .map(dep => b `${this.renderer.invalidate(dep)};`)}
			}
		`);
        binding_group.events.forEach(name => {
            if (name === 'elementresize') {
                // special case
                const resize_listener = block.get_unique_name(`${this.var.name}_resize_listener`);
                block.add_variable(resize_listener);
                block.chunks.mount.push(b `${resize_listener} = @add_resize_listener(${this.var}, ${callee}.bind(${this.var}));`);
                block.chunks.destroy.push(b `${resize_listener}();`);
            }
            else {
                block.event_listeners.push(x `@listen(${this.var}, "${name}", ${callee})`);
            }
        });
        const some_initial_state_is_undefined = binding_group.bindings
            .map(binding => x `${binding.snippet} === void 0`)
            .reduce((lhs, rhs) => x `${lhs} || ${rhs}`);
        const should_initialise = (this.node.name === 'select' ||
            binding_group.bindings.find(binding => {
                return (binding.node.name === 'indeterminate' ||
                    binding.node.name === 'textContent' ||
                    binding.node.name === 'innerHTML' ||
                    binding.is_readonly_media_attribute());
            }));
        if (should_initialise) {
            const callback = has_local_function ? handler : x `() => ${callee}.call(${this.var})`;
            block.chunks.hydrate.push(b `if (${some_initial_state_is_undefined}) @add_render_callback(${callback});`);
        }
        if (binding_group.events[0] === 'elementresize') {
            block.chunks.hydrate.push(b `@add_render_callback(() => ${callee}.call(${this.var}));`);
        }
        if (lock) {
            block.chunks.update.push(b `${lock} = false;`);
        }
    }
    add_this_binding(block, this_binding) {
        const { renderer } = this;
        renderer.component.has_reactive_assignments = true;
        const binding_callback = bind_this(renderer.component, block, this_binding, this.var);
        block.chunks.mount.push(binding_callback);
    }
    add_attributes(block) {
        // Get all the class dependencies first
        this.attributes.forEach((attribute) => {
            if (attribute.node.name === 'class') {
                const dependencies = attribute.node.get_dependencies();
                this.class_dependencies.push(...dependencies);
            }
        });
        if (this.node.attributes.some(attr => attr.is_spread)) {
            this.add_spread_attributes(block);
            return;
        }
        this.attributes.forEach((attribute) => {
            attribute.render(block);
        });
    }
    add_spread_attributes(block) {
        const levels = block.get_unique_name(`${this.var.name}_levels`);
        const data = block.get_unique_name(`${this.var.name}_data`);
        const initial_props = [];
        const updates = [];
        this.attributes
            .forEach(attr => {
            const dependencies = attr.node.get_dependencies();
            const condition = dependencies.length > 0
                ? block.renderer.dirty(dependencies)
                : null;
            if (attr instanceof SpreadAttributeWrapper) {
                const snippet = attr.node.expression.manipulate(block);
                initial_props.push(snippet);
                updates.push(condition ? x `${condition} && ${snippet}` : snippet);
            }
            else {
                const name = attr.property_name || attr.name;
                initial_props.push(x `{ ${name}: ${attr.get_init(block, attr.get_value(block))} }`);
                const snippet = x `{ ${name}: ${attr.should_cache ? attr.last : attr.get_value(block)} }`;
                updates.push(condition ? x `${attr.get_dom_update_conditions(block, condition)} && ${snippet}` : snippet);
            }
        });
        block.chunks.init.push(b `
			let ${levels} = [${initial_props}];

			let ${data} = {};
			for (let #i = 0; #i < ${levels}.length; #i += 1) {
				${data} = @assign(${data}, ${levels}[#i]);
			}
		`);
        const fn = this.node.namespace === namespaces.svg ? x `@set_svg_attributes` : x `@set_attributes`;
        block.chunks.hydrate.push(b `${fn}(${this.var}, ${data});`);
        block.chunks.update.push(b `
			${fn}(${this.var}, ${data} = @get_spread_update(${levels}, [
				${updates}
			]));
		`);
        // handle edge cases for elements
        if (this.node.name === 'select') {
            const dependencies = new Set();
            for (const attr of this.attributes) {
                for (const dep of attr.node.dependencies) {
                    dependencies.add(dep);
                }
            }
            block.chunks.mount.push(b `
				if (${data}.multiple) @select_options(${this.var}, ${data}.value);
			`);
            block.chunks.update.push(b `
				if (${block.renderer.dirty(Array.from(dependencies))} && ${data}.multiple) @select_options(${this.var}, ${data}.value);
			`);
        }
        else if (this.node.name === 'input' && this.attributes.find(attr => attr.node.name === 'value')) {
            const type = this.node.get_static_attribute_value('type');
            if (type === null || type === '' || type === 'text' || type === 'email' || type === 'password') {
                block.chunks.mount.push(b `
					${this.var}.value = ${data}.value;
				`);
                block.chunks.update.push(b `
					if ('value' in ${data}) {
						${this.var}.value = ${data}.value;
					}
				`);
            }
        }
    }
    add_transitions(block) {
        const { intro, outro } = this.node;
        if (!intro && !outro)
            return;
        if (intro === outro) {
            // bidirectional transition
            const name = block.get_unique_name(`${this.var.name}_transition`);
            const snippet = intro.expression
                ? intro.expression.manipulate(block)
                : x `{}`;
            block.add_variable(name);
            const fn = this.renderer.reference(intro.name);
            const intro_block = b `
				@add_render_callback(() => {
					if (!${name}) ${name} = @create_bidirectional_transition(${this.var}, ${fn}, ${snippet}, true);
					${name}.run(1);
				});
			`;
            const outro_block = b `
				if (!${name}) ${name} = @create_bidirectional_transition(${this.var}, ${fn}, ${snippet}, false);
				${name}.run(0);
			`;
            if (intro.is_local) {
                block.chunks.intro.push(b `
					if (#local) {
						${intro_block}
					}
				`);
                block.chunks.outro.push(b `
					if (#local) {
						${outro_block}
					}
				`);
            }
            else {
                block.chunks.intro.push(intro_block);
                block.chunks.outro.push(outro_block);
            }
            block.chunks.destroy.push(b `if (detaching && ${name}) ${name}.end();`);
        }
        else {
            const intro_name = intro && block.get_unique_name(`${this.var.name}_intro`);
            const outro_name = outro && block.get_unique_name(`${this.var.name}_outro`);
            if (intro) {
                block.add_variable(intro_name);
                const snippet = intro.expression
                    ? intro.expression.manipulate(block)
                    : x `{}`;
                const fn = this.renderer.reference(intro.name);
                let intro_block;
                if (outro) {
                    intro_block = b `
						@add_render_callback(() => {
							if (${outro_name}) ${outro_name}.end(1);
							if (!${intro_name}) ${intro_name} = @create_in_transition(${this.var}, ${fn}, ${snippet});
							${intro_name}.start();
						});
					`;
                    block.chunks.outro.push(b `if (${intro_name}) ${intro_name}.invalidate();`);
                }
                else {
                    intro_block = b `
						if (!${intro_name}) {
							@add_render_callback(() => {
								${intro_name} = @create_in_transition(${this.var}, ${fn}, ${snippet});
								${intro_name}.start();
							});
						}
					`;
                }
                if (intro.is_local) {
                    intro_block = b `
						if (#local) {
							${intro_block}
						}
					`;
                }
                block.chunks.intro.push(intro_block);
            }
            if (outro) {
                block.add_variable(outro_name);
                const snippet = outro.expression
                    ? outro.expression.manipulate(block)
                    : x `{}`;
                const fn = this.renderer.reference(outro.name);
                if (!intro) {
                    block.chunks.intro.push(b `
						if (${outro_name}) ${outro_name}.end(1);
					`);
                }
                // TODO hide elements that have outro'd (unless they belong to a still-outroing
                // group) prior to their removal from the DOM
                let outro_block = b `
					${outro_name} = @create_out_transition(${this.var}, ${fn}, ${snippet});
				`;
                if (outro.is_local) {
                    outro_block = b `
						if (#local) {
							${outro_block}
						}
					`;
                }
                block.chunks.outro.push(outro_block);
                block.chunks.destroy.push(b `if (detaching && ${outro_name}) ${outro_name}.end();`);
            }
        }
        if ((intro && intro.expression && intro.expression.dependencies.size) || (outro && outro.expression && outro.expression.dependencies.size)) {
            block.maintain_context = true;
        }
    }
    add_animation(block) {
        if (!this.node.animation)
            return;
        const { outro } = this.node;
        const rect = block.get_unique_name('rect');
        const stop_animation = block.get_unique_name('stop_animation');
        block.add_variable(rect);
        block.add_variable(stop_animation, x `@noop`);
        block.chunks.measure.push(b `
			${rect} = ${this.var}.getBoundingClientRect();
		`);
        block.chunks.fix.push(b `
			@fix_position(${this.var});
			${stop_animation}();
			${outro && b `@add_transform(${this.var}, ${rect});`}
		`);
        let params;
        if (this.node.animation.expression) {
            params = this.node.animation.expression.manipulate(block);
            if (this.node.animation.expression.dynamic_dependencies().length) {
                // if `params` is dynamic, calculate params ahead of time in the `.r()` method
                const params_var = block.get_unique_name('params');
                block.add_variable(params_var);
                block.chunks.measure.push(b `${params_var} = ${params};`);
                params = params_var;
            }
        }
        else {
            params = x `{}`;
        }
        const name = this.renderer.reference(this.node.animation.name);
        block.chunks.animate.push(b `
			${stop_animation}();
			${stop_animation} = @create_animation(${this.var}, ${rect}, ${name}, ${params});
		`);
    }
    add_classes(block) {
        const has_spread = this.node.attributes.some(attr => attr.is_spread);
        this.node.classes.forEach(class_directive => {
            const { expression, name } = class_directive;
            let snippet;
            let dependencies;
            if (expression) {
                snippet = expression.manipulate(block);
                dependencies = expression.dependencies;
            }
            else {
                snippet = name;
                dependencies = new Set([name]);
            }
            const updater = b `@toggle_class(${this.var}, "${name}", ${snippet});`;
            block.chunks.hydrate.push(updater);
            if (has_spread) {
                block.chunks.update.push(updater);
            }
            else if ((dependencies && dependencies.size > 0) || this.class_dependencies.length) {
                const all_dependencies = this.class_dependencies.concat(...dependencies);
                const condition = block.renderer.dirty(all_dependencies);
                // If all of the dependencies are non-dynamic (don't get updated) then there is no reason
                // to add an updater for this.
                const any_dynamic_dependencies = all_dependencies.some((dep) => {
                    const variable = this.renderer.component.var_lookup.get(dep);
                    return !variable || is_dynamic$1(variable);
                });
                if (any_dynamic_dependencies) {
                    block.chunks.update.push(b `
						if (${condition}) {
							${updater}
						}
					`);
                }
            }
        });
    }
    add_manual_style_scoping(block) {
        if (this.node.needs_manual_style_scoping) {
            const updater = b `@toggle_class(${this.var}, "${this.node.component.stylesheet.id}", true);`;
            block.chunks.hydrate.push(updater);
            block.chunks.update.push(updater);
        }
    }
}
function to_html(wrappers, block, literal, state, can_use_raw_text) {
    wrappers.forEach(wrapper => {
        if (wrapper instanceof TextWrapper) {
            if (wrapper.use_space())
                state.quasi.value.raw += ' ';
            const parent = wrapper.node.parent;
            const raw = parent && (parent.name === 'script' ||
                parent.name === 'style' ||
                can_use_raw_text);
            state.quasi.value.raw += (raw ? wrapper.data : escape_html(wrapper.data))
                .replace(/\\/g, '\\\\')
                .replace(/`/g, '\\`')
                .replace(/\$/g, '\\$');
        }
        else if (wrapper instanceof MustacheTagWrapper || wrapper instanceof RawMustacheTagWrapper) {
            literal.quasis.push(state.quasi);
            literal.expressions.push(wrapper.node.expression.manipulate(block));
            state.quasi = {
                type: 'TemplateElement',
                value: { raw: '' }
            };
        }
        else if (wrapper.node.name === 'noscript') ;
        else {
            // element
            state.quasi.value.raw += `<${wrapper.node.name}`;
            wrapper.attributes.forEach((attr) => {
                state.quasi.value.raw += ` ${fix_attribute_casing(attr.node.name)}="`;
                attr.node.chunks.forEach(chunk => {
                    if (chunk.type === 'Text') {
                        state.quasi.value.raw += escape_html(chunk.data);
                    }
                    else {
                        literal.quasis.push(state.quasi);
                        literal.expressions.push(chunk.manipulate(block));
                        state.quasi = {
                            type: 'TemplateElement',
                            value: { raw: '' }
                        };
                    }
                });
                state.quasi.value.raw += '"';
            });
            if (!wrapper.void) {
                state.quasi.value.raw += '>';
                to_html(wrapper.fragment.nodes, block, literal, state);
                state.quasi.value.raw += `</${wrapper.node.name}>`;
            }
            else {
                state.quasi.value.raw += '/>';
            }
        }
    });
}

class HeadWrapper extends Wrapper {
    constructor(renderer, block, parent, node, strip_whitespace, next_sibling) {
        super(renderer, block, parent, node);
        this.can_use_innerhtml = false;
        this.fragment = new FragmentWrapper(renderer, block, node.children, this, strip_whitespace, next_sibling);
    }
    render(block, _parent_node, _parent_nodes) {
        let nodes;
        if (this.renderer.options.hydratable && this.fragment.nodes.length) {
            nodes = block.get_unique_name('head_nodes');
            block.chunks.claim.push(b `const ${nodes} = @query_selector_all('[data-svelte="${this.node.id}"]', @_document.head);`);
        }
        this.fragment.render(block, x `@_document.head`, nodes);
        if (nodes && this.renderer.options.hydratable) {
            block.chunks.claim.push(b `${nodes}.forEach(@detach);`);
        }
    }
}

function is_else_if(node) {
    return (node && node.children.length === 1 && node.children[0].type === 'IfBlock');
}
class IfBlockBranch extends Wrapper {
    constructor(renderer, block, parent, node, strip_whitespace, next_sibling) {
        super(renderer, block, parent, node);
        this.var = null;
        const { expression } = node;
        const is_else = !expression;
        if (expression) {
            this.dependencies = expression.dynamic_dependencies();
            // TODO is this the right rule? or should any non-reference count?
            // const should_cache = !is_reference(expression.node, null) && dependencies.length > 0;
            let should_cache = false;
            walk(expression.node, {
                enter(node) {
                    if (node.type === 'CallExpression' || node.type === 'NewExpression') {
                        should_cache = true;
                    }
                }
            });
            if (should_cache) {
                this.condition = block.get_unique_name('show_if');
                this.snippet = expression.manipulate(block);
            }
            else {
                this.condition = expression.manipulate(block);
            }
        }
        this.block = block.child({
            comment: create_debugging_comment(node, parent.renderer.component),
            name: parent.renderer.component.get_unique_name(is_else ? 'create_else_block' : 'create_if_block'),
            type: node.expression ? 'if' : 'else'
        });
        this.fragment = new FragmentWrapper(renderer, this.block, node.children, parent, strip_whitespace, next_sibling);
        this.is_dynamic = this.block.dependencies.size > 0;
    }
}
class IfBlockWrapper extends Wrapper {
    constructor(renderer, block, parent, node, strip_whitespace, next_sibling) {
        super(renderer, block, parent, node);
        this.needs_update = false;
        this.var = { type: 'Identifier', name: 'if_block' };
        this.cannot_use_innerhtml();
        this.not_static_content();
        this.branches = [];
        const blocks = [];
        let is_dynamic = false;
        let has_intros = false;
        let has_outros = false;
        const create_branches = (node) => {
            const branch = new IfBlockBranch(renderer, block, this, node, strip_whitespace, next_sibling);
            this.branches.push(branch);
            blocks.push(branch.block);
            block.add_dependencies(node.expression.dependencies);
            if (branch.block.dependencies.size > 0) {
                // the condition, or its contents, is dynamic
                is_dynamic = true;
                block.add_dependencies(branch.block.dependencies);
            }
            if (branch.dependencies && branch.dependencies.length > 0) {
                // the condition itself is dynamic
                this.needs_update = true;
            }
            if (branch.block.has_intros)
                has_intros = true;
            if (branch.block.has_outros)
                has_outros = true;
            if (is_else_if(node.else)) {
                create_branches(node.else.children[0]);
            }
            else if (node.else) {
                const branch = new IfBlockBranch(renderer, block, this, node.else, strip_whitespace, next_sibling);
                this.branches.push(branch);
                blocks.push(branch.block);
                if (branch.block.dependencies.size > 0) {
                    is_dynamic = true;
                    block.add_dependencies(branch.block.dependencies);
                }
                if (branch.block.has_intros)
                    has_intros = true;
                if (branch.block.has_outros)
                    has_outros = true;
            }
        };
        create_branches(this.node);
        blocks.forEach(block => {
            block.has_update_method = is_dynamic;
            block.has_intro_method = has_intros;
            block.has_outro_method = has_outros;
        });
        renderer.blocks.push(...blocks);
    }
    render(block, parent_node, parent_nodes) {
        const name = this.var;
        const needs_anchor = this.next ? !this.next.is_dom_node() : !parent_node || !this.parent.is_dom_node();
        const anchor = needs_anchor
            ? block.get_unique_name(`${this.var.name}_anchor`)
            : (this.next && this.next.var) || 'null';
        const has_else = !(this.branches[this.branches.length - 1].condition);
        const if_exists_condition = has_else ? null : name;
        const dynamic = this.branches[0].block.has_update_method; // can use [0] as proxy for all, since they necessarily have the same value
        const has_intros = this.branches[0].block.has_intro_method;
        const has_outros = this.branches[0].block.has_outro_method;
        const has_transitions = has_intros || has_outros;
        const vars = { name, anchor, if_exists_condition, has_else, has_transitions };
        const detaching = parent_node && !is_head(parent_node) ? null : 'detaching';
        if (this.node.else) {
            this.branches.forEach(branch => {
                if (branch.snippet)
                    block.add_variable(branch.condition);
            });
            if (has_outros) {
                this.render_compound_with_outros(block, parent_node, parent_nodes, dynamic, vars, detaching);
                block.chunks.outro.push(b `@transition_out(${name});`);
            }
            else {
                this.render_compound(block, parent_node, parent_nodes, dynamic, vars, detaching);
            }
        }
        else {
            this.render_simple(block, parent_node, parent_nodes, dynamic, vars, detaching);
            if (has_outros) {
                block.chunks.outro.push(b `@transition_out(${name});`);
            }
        }
        if (if_exists_condition) {
            block.chunks.create.push(b `if (${if_exists_condition}) ${name}.c();`);
        }
        else {
            block.chunks.create.push(b `${name}.c();`);
        }
        if (parent_nodes && this.renderer.options.hydratable) {
            if (if_exists_condition) {
                block.chunks.claim.push(b `if (${if_exists_condition}) ${name}.l(${parent_nodes});`);
            }
            else {
                block.chunks.claim.push(b `${name}.l(${parent_nodes});`);
            }
        }
        if (has_intros || has_outros) {
            block.chunks.intro.push(b `@transition_in(${name});`);
        }
        if (needs_anchor) {
            block.add_element(anchor, x `@empty()`, parent_nodes && x `@empty()`, parent_node);
        }
        this.branches.forEach(branch => {
            branch.fragment.render(branch.block, null, x `#nodes`);
        });
    }
    render_compound(block, parent_node, _parent_nodes, dynamic, { name, anchor, has_else, if_exists_condition, has_transitions }, detaching) {
        const select_block_type = this.renderer.component.get_unique_name('select_block_type');
        const current_block_type = block.get_unique_name('current_block_type');
        const get_block = has_else
            ? x `${current_block_type}(#ctx)`
            : x `${current_block_type} && ${current_block_type}(#ctx)`;
        if (this.needs_update) {
            block.chunks.init.push(b `
				function ${select_block_type}(#ctx, #dirty) {
					${this.branches.map(({ dependencies, condition, snippet, block }) => condition
                ? b `
					${snippet && (dependencies.length > 0
                    ? b `if (${condition} == null || ${block.renderer.dirty(dependencies)}) ${condition} = !!${snippet}`
                    : b `if (${condition} == null) ${condition} = !!${snippet}`)}
					if (${condition}) return ${block.name};`
                : b `return ${block.name};`)}
				}
			`);
        }
        else {
            block.chunks.init.push(b `
				function ${select_block_type}(#ctx, #dirty) {
					${this.branches.map(({ condition, snippet, block }) => condition
                ? b `if (${snippet || condition}) return ${block.name};`
                : b `return ${block.name};`)}
				}
			`);
        }
        block.chunks.init.push(b `
			let ${current_block_type} = ${select_block_type}(#ctx, ${this.get_initial_dirty_bit()});
			let ${name} = ${get_block};
		`);
        const initial_mount_node = parent_node || '#target';
        const anchor_node = parent_node ? 'null' : '#anchor';
        if (if_exists_condition) {
            block.chunks.mount.push(b `if (${if_exists_condition}) ${name}.m(${initial_mount_node}, ${anchor_node});`);
        }
        else {
            block.chunks.mount.push(b `${name}.m(${initial_mount_node}, ${anchor_node});`);
        }
        if (this.needs_update) {
            const update_mount_node = this.get_update_mount_node(anchor);
            const change_block = b `
				${if_exists_condition ? b `if (${if_exists_condition}) ${name}.d(1)` : b `${name}.d(1)`};
				${name} = ${get_block};
				if (${name}) {
					${name}.c();
					${has_transitions && b `@transition_in(${name}, 1);`}
					${name}.m(${update_mount_node}, ${anchor});
				}
			`;
            if (dynamic) {
                block.chunks.update.push(b `
					if (${current_block_type} === (${current_block_type} = ${select_block_type}(#ctx, #dirty)) && ${name}) {
						${name}.p(#ctx, #dirty);
					} else {
						${change_block}
					}
				`);
            }
            else {
                block.chunks.update.push(b `
					if (${current_block_type} !== (${current_block_type} = ${select_block_type}(#ctx, #dirty))) {
						${change_block}
					}
				`);
            }
        }
        else if (dynamic) {
            if (if_exists_condition) {
                block.chunks.update.push(b `if (${if_exists_condition}) ${name}.p(#ctx, #dirty);`);
            }
            else {
                block.chunks.update.push(b `${name}.p(#ctx, #dirty);`);
            }
        }
        if (if_exists_condition) {
            block.chunks.destroy.push(b `
				if (${if_exists_condition}) {
					${name}.d(${detaching});
				}
			`);
        }
        else {
            block.chunks.destroy.push(b `
				${name}.d(${detaching});
			`);
        }
    }
    // if any of the siblings have outros, we need to keep references to the blocks
    // (TODO does this only apply to bidi transitions?)
    render_compound_with_outros(block, parent_node, _parent_nodes, dynamic, { name, anchor, has_else, has_transitions, if_exists_condition }, detaching) {
        const select_block_type = this.renderer.component.get_unique_name('select_block_type');
        const current_block_type_index = block.get_unique_name('current_block_type_index');
        const previous_block_index = block.get_unique_name('previous_block_index');
        const if_block_creators = block.get_unique_name('if_block_creators');
        const if_blocks = block.get_unique_name('if_blocks');
        const if_current_block_type_index = has_else
            ? nodes => nodes
            : nodes => b `if (~${current_block_type_index}) { ${nodes} }`;
        block.add_variable(current_block_type_index);
        block.add_variable(name);
        block.chunks.init.push(b `
			const ${if_block_creators} = [
				${this.branches.map(branch => branch.block.name)}
			];

			const ${if_blocks} = [];

			${this.needs_update
            ? b `
					function ${select_block_type}(#ctx, #dirty) {
						${this.branches.map(({ dependencies, condition, snippet }, i) => condition
                ? b `
						${snippet && (dependencies.length > 0
                    ? b `if (${block.renderer.dirty(dependencies)}) ${condition} = !!${snippet}`
                    : b `if (${condition} == null) ${condition} = !!${snippet}`)}
						if (${condition}) return ${i};`
                : b `return ${i};`)}
						${!has_else && b `return -1;`}
					}
				`
            : b `
					function ${select_block_type}(#ctx, #dirty) {
						${this.branches.map(({ condition, snippet }, i) => condition
                ? b `if (${snippet || condition}) return ${i};`
                : b `return ${i};`)}
						${!has_else && b `return -1;`}
					}
				`}
		`);
        if (has_else) {
            block.chunks.init.push(b `
				${current_block_type_index} = ${select_block_type}(#ctx, ${this.get_initial_dirty_bit()});
				${name} = ${if_blocks}[${current_block_type_index}] = ${if_block_creators}[${current_block_type_index}](#ctx);
			`);
        }
        else {
            block.chunks.init.push(b `
				if (~(${current_block_type_index} = ${select_block_type}(#ctx, ${this.get_initial_dirty_bit()}))) {
					${name} = ${if_blocks}[${current_block_type_index}] = ${if_block_creators}[${current_block_type_index}](#ctx);
				}
			`);
        }
        const initial_mount_node = parent_node || '#target';
        const anchor_node = parent_node ? 'null' : '#anchor';
        block.chunks.mount.push(if_current_block_type_index(b `${if_blocks}[${current_block_type_index}].m(${initial_mount_node}, ${anchor_node});`));
        if (this.needs_update) {
            const update_mount_node = this.get_update_mount_node(anchor);
            const destroy_old_block = b `
				@group_outros();
				@transition_out(${if_blocks}[${previous_block_index}], 1, 1, () => {
					${if_blocks}[${previous_block_index}] = null;
				});
				@check_outros();
			`;
            const create_new_block = b `
				${name} = ${if_blocks}[${current_block_type_index}];
				if (!${name}) {
					${name} = ${if_blocks}[${current_block_type_index}] = ${if_block_creators}[${current_block_type_index}](#ctx);
					${name}.c();
				} else {
					${dynamic && b `${name}.p(#ctx, #dirty);`}
				}
				${has_transitions && b `@transition_in(${name}, 1);`}
				${name}.m(${update_mount_node}, ${anchor});
			`;
            const change_block = has_else
                ? b `
					${destroy_old_block}

					${create_new_block}
				`
                : b `
					if (${name}) {
						${destroy_old_block}
					}

					if (~${current_block_type_index}) {
						${create_new_block}
					} else {
						${name} = null;
					}
				`;
            block.chunks.update.push(b `
				let ${previous_block_index} = ${current_block_type_index};
				${current_block_type_index} = ${select_block_type}(#ctx, #dirty);
			`);
            if (dynamic) {
                block.chunks.update.push(b `
					if (${current_block_type_index} === ${previous_block_index}) {
						${if_current_block_type_index(b `${if_blocks}[${current_block_type_index}].p(#ctx, #dirty);`)}
					} else {
						${change_block}
					}
				`);
            }
            else {
                block.chunks.update.push(b `
					if (${current_block_type_index} !== ${previous_block_index}) {
						${change_block}
					}
				`);
            }
        }
        else if (dynamic) {
            if (if_exists_condition) {
                block.chunks.update.push(b `if (${if_exists_condition}) ${name}.p(#ctx, #dirty);`);
            }
            else {
                block.chunks.update.push(b `${name}.p(#ctx, #dirty);`);
            }
        }
        block.chunks.destroy.push(if_current_block_type_index(b `${if_blocks}[${current_block_type_index}].d(${detaching});`));
    }
    render_simple(block, parent_node, _parent_nodes, dynamic, { name, anchor, if_exists_condition, has_transitions }, detaching) {
        const branch = this.branches[0];
        if (branch.snippet)
            block.add_variable(branch.condition, branch.snippet);
        block.chunks.init.push(b `
			let ${name} = ${branch.condition} && ${branch.block.name}(#ctx);
		`);
        const initial_mount_node = parent_node || '#target';
        const anchor_node = parent_node ? 'null' : '#anchor';
        block.chunks.mount.push(b `if (${name}) ${name}.m(${initial_mount_node}, ${anchor_node});`);
        if (branch.dependencies.length > 0) {
            const update_mount_node = this.get_update_mount_node(anchor);
            const enter = b `
				if (${name}) {
					${dynamic && b `${name}.p(#ctx, #dirty);`}
					${has_transitions &&
                b `if (${block.renderer.dirty(branch.dependencies)}) {
							@transition_in(${name}, 1);
						}`}
				} else {
					${name} = ${branch.block.name}(#ctx);
					${name}.c();
					${has_transitions && b `@transition_in(${name}, 1);`}
					${name}.m(${update_mount_node}, ${anchor});
				}
			`;
            if (branch.snippet) {
                block.chunks.update.push(b `if (${block.renderer.dirty(branch.dependencies)}) ${branch.condition} = ${branch.snippet}`);
            }
            // no `p()` here — we don't want to update outroing nodes,
            // as that will typically result in glitching
            if (branch.block.has_outro_method) {
                block.chunks.update.push(b `
					if (${branch.condition}) {
						${enter}
					} else if (${name}) {
						@group_outros();
						@transition_out(${name}, 1, 1, () => {
							${name} = null;
						});
						@check_outros();
					}
				`);
            }
            else {
                block.chunks.update.push(b `
					if (${branch.condition}) {
						${enter}
					} else if (${name}) {
						${name}.d(1);
						${name} = null;
					}
				`);
            }
        }
        else if (dynamic) {
            block.chunks.update.push(b `
				if (${branch.condition}) ${name}.p(#ctx, #dirty);
			`);
        }
        if (if_exists_condition) {
            block.chunks.destroy.push(b `
				if (${if_exists_condition}) ${name}.d(${detaching});
			`);
        }
        else {
            block.chunks.destroy.push(b `
				${name}.d(${detaching});
			`);
        }
    }
    get_initial_dirty_bit() {
        const _this = this;
        // TODO: context-overflow make it less gross
        const val = x `-1`;
        return {
            get type() {
                return _this.renderer.context_overflow ? 'ArrayExpression' : 'UnaryExpression';
            },
            // as [-1]
            elements: [val],
            // as -1
            operator: val.operator,
            prefix: val.prefix,
            argument: val.argument
        };
    }
}

class KeyBlockWrapper extends Wrapper {
    constructor(renderer, block, parent, node, strip_whitespace, next_sibling) {
        super(renderer, block, parent, node);
        this.var = { type: 'Identifier', name: 'key_block' };
        this.cannot_use_innerhtml();
        this.not_static_content();
        this.dependencies = node.expression.dynamic_dependencies();
        if (this.dependencies.length) {
            block = block.child({
                comment: create_debugging_comment(node, renderer.component),
                name: renderer.component.get_unique_name('create_key_block'),
                type: 'key'
            });
            renderer.blocks.push(block);
        }
        this.block = block;
        this.fragment = new FragmentWrapper(renderer, this.block, node.children, this, strip_whitespace, next_sibling);
    }
    render(block, parent_node, parent_nodes) {
        if (this.dependencies.length === 0) {
            this.render_static_key(block, parent_node, parent_nodes);
        }
        else {
            this.render_dynamic_key(block, parent_node, parent_nodes);
        }
    }
    render_static_key(_block, parent_node, parent_nodes) {
        this.fragment.render(this.block, parent_node, parent_nodes);
    }
    render_dynamic_key(block, parent_node, parent_nodes) {
        this.fragment.render(this.block, null, x `#nodes`);
        const has_transitions = !!(this.block.has_intro_method || this.block.has_outro_method);
        const dynamic = this.block.has_update_method;
        const previous_key = block.get_unique_name('previous_key');
        const snippet = this.node.expression.manipulate(block);
        block.add_variable(previous_key, snippet);
        const not_equal = this.renderer.component.component_options.immutable ? x `@not_equal` : x `@safe_not_equal`;
        const condition = x `${this.renderer.dirty(this.dependencies)} && ${not_equal}(${previous_key}, ${previous_key} = ${snippet})`;
        block.chunks.init.push(b `
			let ${this.var} = ${this.block.name}(#ctx);
		`);
        block.chunks.create.push(b `${this.var}.c();`);
        if (this.renderer.options.hydratable) {
            block.chunks.claim.push(b `${this.var}.l(${parent_nodes});`);
        }
        block.chunks.mount.push(b `${this.var}.m(${parent_node || '#target'}, ${parent_node ? 'null' : '#anchor'});`);
        const anchor = this.get_or_create_anchor(block, parent_node, parent_nodes);
        const body = b `
			${has_transitions
            ? b `
						@group_outros();
						@transition_out(${this.var}, 1, 1, @noop);
						@check_outros();
					`
            : b `${this.var}.d(1);`}
			${this.var} = ${this.block.name}(#ctx);
			${this.var}.c();
			${has_transitions && b `@transition_in(${this.var})`}
			${this.var}.m(${this.get_update_mount_node(anchor)}, ${anchor});
		`;
        if (dynamic) {
            block.chunks.update.push(b `
				if (${condition}) {
					${body}
				} else {
					${this.var}.p(#ctx, #dirty);
				}
			`);
        }
        else {
            block.chunks.update.push(b `
				if (${condition}) {
					${body}
				}
			`);
        }
        if (has_transitions) {
            block.chunks.intro.push(b `@transition_in(${this.var})`);
            block.chunks.outro.push(b `@transition_out(${this.var})`);
        }
        block.chunks.destroy.push(b `${this.var}.d(detaching)`);
    }
}

function get_slot_definition(block, scope, lets) {
    if (lets.length === 0)
        return { block, scope };
    const context_input = {
        type: 'ObjectPattern',
        properties: lets.map(l => ({
            type: 'Property',
            kind: 'init',
            key: l.name,
            value: l.value || l.name
        }))
    };
    const properties = [];
    const value_map = new Map();
    lets.forEach(l => {
        let value;
        if (l.names.length > 1) {
            // more than one, probably destructuring
            const unique_name = block.get_unique_name(l.names.join('_')).name;
            value_map.set(l.value, unique_name);
            value = { type: 'Identifier', name: unique_name };
        }
        else {
            value = l.value || l.name;
        }
        properties.push({
            type: 'Property',
            kind: 'init',
            key: l.name,
            value
        });
    });
    const changes_input = {
        type: 'ObjectPattern',
        properties
    };
    const names = new Set();
    const names_lookup = new Map();
    lets.forEach(l => {
        l.names.forEach(name => {
            names.add(name);
            if (value_map.has(l.value)) {
                names_lookup.set(name, value_map.get(l.value));
            }
        });
    });
    const context = {
        type: 'ObjectExpression',
        properties: Array.from(names).map(name => p `${block.renderer.context_lookup.get(name).index}: ${name}`)
    };
    const { context_lookup } = block.renderer;
    // i am well aware that this code is gross
    // TODO: context-overflow make it less gross
    const changes = {
        type: 'ParenthesizedExpression',
        get expression() {
            if (block.renderer.context_overflow) {
                const grouped = [];
                Array.from(names).forEach(name => {
                    const i = context_lookup.get(name).index.value;
                    const g = Math.floor(i / 31);
                    const lookup_name = names_lookup.has(name) ? names_lookup.get(name) : name;
                    if (!grouped[g])
                        grouped[g] = [];
                    grouped[g].push({ name: lookup_name, n: i % 31 });
                });
                const elements = [];
                for (let g = 0; g < grouped.length; g += 1) {
                    elements[g] = grouped[g]
                        ? grouped[g]
                            .map(({ name, n }) => x `${name} ? ${1 << n} : 0`)
                            .reduce((lhs, rhs) => x `${lhs} | ${rhs}`)
                        : x `0`;
                }
                return {
                    type: 'ArrayExpression',
                    elements
                };
            }
            return Array.from(names)
                .map(name => {
                const lookup_name = names_lookup.has(name) ? names_lookup.get(name) : name;
                const i = context_lookup.get(name).index.value;
                return x `${lookup_name} ? ${1 << i} : 0`;
            })
                .reduce((lhs, rhs) => x `${lhs} | ${rhs}`);
        }
    };
    return {
        block,
        scope,
        get_context: x `${context_input} => ${context}`,
        get_changes: x `${changes_input} => ${changes}`
    };
}

class SlotTemplateWrapper extends Wrapper {
    constructor(renderer, block, parent, node, strip_whitespace, next_sibling) {
        super(renderer, block, parent, node);
        const { scope, lets, slot_template_name } = this.node;
        lets.forEach(l => {
            extract_names(l.value || l.name).forEach(name => {
                renderer.add_to_context(name, true);
            });
        });
        this.block = block.child({
            comment: create_debugging_comment(this.node, this.renderer.component),
            name: this.renderer.component.get_unique_name(`create_${sanitize(slot_template_name)}_slot`),
            type: 'slot'
        });
        this.renderer.blocks.push(this.block);
        const seen = new Set(lets.map(l => l.name.name));
        this.parent.node.lets.forEach(l => {
            if (!seen.has(l.name.name))
                lets.push(l);
        });
        this.parent.set_slot(slot_template_name, get_slot_definition(this.block, scope, lets));
        this.fragment = new FragmentWrapper(renderer, this.block, node.type === 'SlotTemplate' ? node.children : [node], this, strip_whitespace, next_sibling);
        this.block.parent.add_dependencies(this.block.dependencies);
    }
    render() {
        this.fragment.render(this.block, null, x `#nodes`);
    }
}

function string_to_member_expression(name) {
    const parts = name.split('.');
    let node = {
        type: 'Identifier',
        name: parts[0]
    };
    for (let i = 1; i < parts.length; i++) {
        node = {
            type: 'MemberExpression',
            object: node,
            property: { type: 'Identifier', name: parts[i] }
        };
    }
    return node;
}

class InlineComponentWrapper extends Wrapper {
    constructor(renderer, block, parent, node, strip_whitespace, next_sibling) {
        super(renderer, block, parent, node);
        this.slots = new Map();
        this.children = [];
        this.cannot_use_innerhtml();
        this.not_static_content();
        if (this.node.expression) {
            block.add_dependencies(this.node.expression.dependencies);
        }
        this.node.attributes.forEach(attr => {
            block.add_dependencies(attr.dependencies);
        });
        this.node.bindings.forEach(binding => {
            if (binding.is_contextual) {
                mark_each_block_bindings(this, binding);
            }
            block.add_dependencies(binding.expression.dependencies);
        });
        this.node.handlers.forEach(handler => {
            if (handler.expression) {
                block.add_dependencies(handler.expression.dependencies);
            }
        });
        this.var = {
            type: 'Identifier',
            name: (this.node.name === 'svelte:self' ? renderer.component.name.name :
                this.node.name === 'svelte:component' ? 'switch_instance' :
                    sanitize(this.node.name)).toLowerCase()
        };
        if (this.node.children.length) {
            this.node.lets.forEach(l => {
                extract_names(l.value || l.name).forEach(name => {
                    renderer.add_to_context(name, true);
                });
            });
            this.children = this.node.children.map(child => new SlotTemplateWrapper(renderer, block, this, child, strip_whitespace, next_sibling));
        }
        block.add_outro();
    }
    set_slot(name, slot_definition) {
        if (this.slots.has(name)) {
            if (name === 'default') {
                throw new Error('Found elements without slot attribute when using slot="default"');
            }
            throw new Error(`Duplicate slot name "${name}" in <${this.node.name}>`);
        }
        this.slots.set(name, slot_definition);
    }
    warn_if_reactive() {
        const { name } = this.node;
        const variable = this.renderer.component.var_lookup.get(name);
        if (!variable) {
            return;
        }
        if (variable.reassigned || variable.export_name || variable.is_reactive_dependency) {
            this.renderer.component.warn(this.node, {
                code: 'reactive-component',
                message: `<${name}/> will not be reactive if ${name} changes. Use <svelte:component this={${name}}/> if you want this reactivity.`
            });
        }
    }
    render(block, parent_node, parent_nodes) {
        this.warn_if_reactive();
        const { renderer } = this;
        const { component } = renderer;
        const name = this.var;
        block.add_variable(name);
        const component_opts = x `{}`;
        const statements = [];
        const updates = [];
        this.children.forEach((child) => {
            this.renderer.add_to_context('$$scope', true);
            child.render(block, null, x `#nodes`);
        });
        let props;
        const name_changes = block.get_unique_name(`${name.name}_changes`);
        const uses_spread = !!this.node.attributes.find(a => a.is_spread);
        // removing empty slot
        for (const slot of this.slots.keys()) {
            if (!this.slots.get(slot).block.has_content()) {
                this.renderer.remove_block(this.slots.get(slot).block);
                this.slots.delete(slot);
            }
        }
        const initial_props = this.slots.size > 0
            ? [
                p `$$slots: {
					${Array.from(this.slots).map(([name, slot]) => {
                    return p `${name}: [${slot.block.name}, ${slot.get_context || null}, ${slot.get_changes || null}]`;
                })}
				}`,
                p `$$scope: {
					ctx: #ctx
				}`
            ]
            : [];
        const attribute_object = uses_spread
            ? x `{ ${initial_props} }`
            : x `{
				${this.node.attributes.map(attr => p `${attr.name}: ${attr.get_value(block)}`)},
				${initial_props}
			}`;
        if (this.node.attributes.length || this.node.bindings.length || initial_props.length) {
            if (!uses_spread && this.node.bindings.length === 0) {
                component_opts.properties.push(p `props: ${attribute_object}`);
            }
            else {
                props = block.get_unique_name(`${name.name}_props`);
                component_opts.properties.push(p `props: ${props}`);
            }
        }
        if (component.compile_options.dev) {
            // TODO this is a terrible hack, but without it the component
            // will complain that options.target is missing. This would
            // work better if components had separate public and private
            // APIs
            component_opts.properties.push(p `$$inline: true`);
        }
        const fragment_dependencies = new Set(this.slots.size ? ['$$scope'] : []);
        this.slots.forEach(slot => {
            slot.block.dependencies.forEach(name => {
                const is_let = slot.scope.is_let(name);
                const variable = renderer.component.var_lookup.get(name);
                if (is_let || is_dynamic$1(variable))
                    fragment_dependencies.add(name);
            });
        });
        const dynamic_attributes = this.node.attributes.filter(a => a.get_dependencies().length > 0);
        if (!uses_spread && (dynamic_attributes.length > 0 || this.node.bindings.length > 0 || fragment_dependencies.size > 0)) {
            updates.push(b `const ${name_changes} = {};`);
        }
        if (this.node.attributes.length) {
            if (uses_spread) {
                const levels = block.get_unique_name(`${this.var.name}_spread_levels`);
                const initial_props = [];
                const changes = [];
                const all_dependencies = new Set();
                this.node.attributes.forEach(attr => {
                    add_to_set(all_dependencies, attr.dependencies);
                });
                this.node.attributes.forEach((attr, i) => {
                    const { name, dependencies } = attr;
                    const condition = dependencies.size > 0 && (dependencies.size !== all_dependencies.size)
                        ? renderer.dirty(Array.from(dependencies))
                        : null;
                    const unchanged = dependencies.size === 0;
                    let change_object;
                    if (attr.is_spread) {
                        const value = attr.expression.manipulate(block);
                        initial_props.push(value);
                        let value_object = value;
                        if (attr.expression.node.type !== 'ObjectExpression') {
                            value_object = x `@get_spread_object(${value})`;
                        }
                        change_object = value_object;
                    }
                    else {
                        const obj = x `{ ${name}: ${attr.get_value(block)} }`;
                        initial_props.push(obj);
                        change_object = obj;
                    }
                    changes.push(unchanged
                        ? x `${levels}[${i}]`
                        : condition
                            ? x `${condition} && ${change_object}`
                            : change_object);
                });
                block.chunks.init.push(b `
					const ${levels} = [
						${initial_props}
					];
				`);
                statements.push(b `
					for (let #i = 0; #i < ${levels}.length; #i += 1) {
						${props} = @assign(${props}, ${levels}[#i]);
					}
				`);
                if (all_dependencies.size) {
                    const condition = renderer.dirty(Array.from(all_dependencies));
                    updates.push(b `
						const ${name_changes} = ${condition} ? @get_spread_update(${levels}, [
							${changes}
						]) : {}
					`);
                }
                else {
                    updates.push(b `
						const ${name_changes} = {};
					`);
                }
            }
            else {
                dynamic_attributes.forEach((attribute) => {
                    const dependencies = attribute.get_dependencies();
                    if (dependencies.length > 0) {
                        const condition = renderer.dirty(dependencies);
                        updates.push(b `
							if (${condition}) ${name_changes}.${attribute.name} = ${attribute.get_value(block)};
						`);
                    }
                });
            }
        }
        if (fragment_dependencies.size > 0) {
            updates.push(b `
				if (${renderer.dirty(Array.from(fragment_dependencies))}) {
					${name_changes}.$$scope = { dirty: #dirty, ctx: #ctx };
				}`);
        }
        const munged_bindings = this.node.bindings.map(binding => {
            component.has_reactive_assignments = true;
            if (binding.name === 'this') {
                return bind_this(component, block, new BindingWrapper(block, binding, this), this.var);
            }
            const id = component.get_unique_name(`${this.var.name}_${binding.name}_binding`);
            renderer.add_to_context(id.name);
            const callee = renderer.reference(id);
            const updating = block.get_unique_name(`updating_${binding.name}`);
            block.add_variable(updating);
            const snippet = binding.expression.manipulate(block);
            statements.push(b `
				if (${snippet} !== void 0) {
					${props}.${binding.name} = ${snippet};
				}`);
            updates.push(b `
				if (!${updating} && ${renderer.dirty(Array.from(binding.expression.dependencies))}) {
					${updating} = true;
					${name_changes}.${binding.name} = ${snippet};
					@add_flush_callback(() => ${updating} = false);
				}
			`);
            const contextual_dependencies = Array.from(binding.expression.contextual_dependencies);
            const dependencies = Array.from(binding.expression.dependencies);
            let lhs = binding.raw_expression;
            if (binding.is_contextual && binding.expression.node.type === 'Identifier') {
                // bind:x={y} — we can't just do `y = x`, we need to
                // to `array[index] = x;
                const { name } = binding.expression.node;
                const { object, property, snippet } = block.bindings.get(name);
                lhs = snippet;
                contextual_dependencies.push(object.name, property.name);
            }
            const params = [x `#value`];
            const args = [x `#value`];
            if (contextual_dependencies.length > 0) {
                contextual_dependencies.forEach(name => {
                    params.push({
                        type: 'Identifier',
                        name
                    });
                    renderer.add_to_context(name, true);
                    args.push(renderer.reference(name));
                });
                block.maintain_context = true; // TODO put this somewhere more logical
            }
            block.chunks.init.push(b `
				function ${id}(#value) {
					${callee}(${args});
				}
			`);
            let invalidate_binding = b `
				${lhs} = #value;
				${renderer.invalidate(dependencies[0])};
			`;
            if (binding.expression.node.type === 'MemberExpression') {
                invalidate_binding = b `
					if ($$self.$$.not_equal(${lhs}, #value)) {
						${invalidate_binding}
					}
				`;
            }
            const body = b `
				function ${id}(${params}) {
					${invalidate_binding}
				}
			`;
            component.partly_hoisted.push(body);
            return b `@binding_callbacks.push(() => @bind(${this.var}, '${binding.name}', ${id}));`;
        });
        const munged_handlers = this.node.handlers.map(handler => {
            const event_handler = new EventHandlerWrapper(handler, this);
            let snippet = event_handler.get_snippet(block);
            if (handler.modifiers.has('once'))
                snippet = x `@once(${snippet})`;
            return b `${name}.$on("${handler.name}", ${snippet});`;
        });
        if (this.node.name === 'svelte:component') {
            const switch_value = block.get_unique_name('switch_value');
            const switch_props = block.get_unique_name('switch_props');
            const snippet = this.node.expression.manipulate(block);
            block.chunks.init.push(b `
				var ${switch_value} = ${snippet};

				function ${switch_props}(#ctx) {
					${(this.node.attributes.length > 0 || this.node.bindings.length > 0) && b `
					${props && b `let ${props} = ${attribute_object};`}`}
					${statements}
					return ${component_opts};
				}

				if (${switch_value}) {
					${name} = new ${switch_value}(${switch_props}(#ctx));

					${munged_bindings}
					${munged_handlers}
				}
			`);
            block.chunks.create.push(b `if (${name}) @create_component(${name}.$$.fragment);`);
            if (parent_nodes && this.renderer.options.hydratable) {
                block.chunks.claim.push(b `if (${name}) @claim_component(${name}.$$.fragment, ${parent_nodes});`);
            }
            block.chunks.mount.push(b `
				if (${name}) {
					@mount_component(${name}, ${parent_node || '#target'}, ${parent_node ? 'null' : '#anchor'});
				}
			`);
            const anchor = this.get_or_create_anchor(block, parent_node, parent_nodes);
            const update_mount_node = this.get_update_mount_node(anchor);
            if (updates.length) {
                block.chunks.update.push(b `
					${updates}
				`);
            }
            block.chunks.update.push(b `
				if (${switch_value} !== (${switch_value} = ${snippet})) {
					if (${name}) {
						@group_outros();
						const old_component = ${name};
						@transition_out(old_component.$$.fragment, 1, 0, () => {
							@destroy_component(old_component, 1);
						});
						@check_outros();
					}

					if (${switch_value}) {
						${name} = new ${switch_value}(${switch_props}(#ctx));

						${munged_bindings}
						${munged_handlers}

						@create_component(${name}.$$.fragment);
						@transition_in(${name}.$$.fragment, 1);
						@mount_component(${name}, ${update_mount_node}, ${anchor});
					} else {
						${name} = null;
					}
				} else if (${switch_value}) {
					${updates.length > 0 && b `${name}.$set(${name_changes});`}
				}
			`);
            block.chunks.intro.push(b `
				if (${name}) @transition_in(${name}.$$.fragment, #local);
			`);
            block.chunks.outro.push(b `if (${name}) @transition_out(${name}.$$.fragment, #local);`);
            block.chunks.destroy.push(b `if (${name}) @destroy_component(${name}, ${parent_node ? null : 'detaching'});`);
        }
        else {
            const expression = this.node.name === 'svelte:self'
                ? component.name
                : this.renderer.reference(string_to_member_expression(this.node.name));
            block.chunks.init.push(b `
				${(this.node.attributes.length > 0 || this.node.bindings.length > 0) && b `
				${props && b `let ${props} = ${attribute_object};`}`}
				${statements}
				${name} = new ${expression}(${component_opts});

				${munged_bindings}
				${munged_handlers}
			`);
            block.chunks.create.push(b `@create_component(${name}.$$.fragment);`);
            if (parent_nodes && this.renderer.options.hydratable) {
                block.chunks.claim.push(b `@claim_component(${name}.$$.fragment, ${parent_nodes});`);
            }
            block.chunks.mount.push(b `@mount_component(${name}, ${parent_node || '#target'}, ${parent_node ? 'null' : '#anchor'});`);
            block.chunks.intro.push(b `
				@transition_in(${name}.$$.fragment, #local);
			`);
            if (updates.length) {
                block.chunks.update.push(b `
					${updates}
					${name}.$set(${name_changes});
				`);
            }
            block.chunks.destroy.push(b `
				@destroy_component(${name}, ${parent_node ? null : 'detaching'});
			`);
            block.chunks.outro.push(b `@transition_out(${name}.$$.fragment, #local);`);
        }
    }
}

function get_slot_data(values, block = null) {
    return {
        type: 'ObjectExpression',
        properties: Array.from(values.values())
            .filter(attribute => attribute.name !== 'name')
            .map(attribute => {
            if (attribute.is_spread) {
                const argument = get_spread_value(block, attribute);
                return {
                    type: 'SpreadElement',
                    argument
                };
            }
            const value = get_value(block, attribute);
            return p `${attribute.name}: ${value}`;
        })
    };
}
function get_value(block, attribute) {
    if (attribute.is_true)
        return x `true`;
    if (attribute.chunks.length === 0)
        return x `""`;
    let value = attribute.chunks
        .map(chunk => chunk.type === 'Text' ? string_literal(chunk.data) : (block ? chunk.manipulate(block) : chunk.node))
        .reduce((lhs, rhs) => x `${lhs} + ${rhs}`);
    if (attribute.chunks.length > 1 && attribute.chunks[0].type !== 'Text') {
        value = x `"" + ${value}`;
    }
    return value;
}
function get_spread_value(block, attribute) {
    return block ? attribute.expression.manipulate(block) : attribute.expression.node;
}

class SlotWrapper extends Wrapper {
    constructor(renderer, block, parent, node, strip_whitespace, next_sibling) {
        super(renderer, block, parent, node);
        this.fallback = null;
        this.var = { type: 'Identifier', name: 'slot' };
        this.dependencies = new Set(['$$scope']);
        this.cannot_use_innerhtml();
        this.not_static_content();
        if (this.node.children.length) {
            this.fallback = block.child({
                comment: create_debugging_comment(this.node.children[0], this.renderer.component),
                name: this.renderer.component.get_unique_name('fallback_block'),
                type: 'fallback'
            });
            renderer.blocks.push(this.fallback);
        }
        this.fragment = new FragmentWrapper(renderer, this.fallback, node.children, this, strip_whitespace, next_sibling);
        this.node.values.forEach(attribute => {
            add_to_set(this.dependencies, attribute.dependencies);
        });
        block.add_dependencies(this.dependencies);
        // we have to do this, just in case
        block.add_intro();
        block.add_outro();
    }
    render(block, parent_node, parent_nodes) {
        const { renderer } = this;
        const { slot_name } = this.node;
        if (this.slot_block) {
            block = this.slot_block;
        }
        let get_slot_changes_fn;
        let get_slot_spread_changes_fn;
        let get_slot_context_fn;
        if (this.node.values.size > 0) {
            get_slot_changes_fn = renderer.component.get_unique_name(`get_${sanitize(slot_name)}_slot_changes`);
            get_slot_context_fn = renderer.component.get_unique_name(`get_${sanitize(slot_name)}_slot_context`);
            const changes = x `{}`;
            const spread_dynamic_dependencies = new Set();
            this.node.values.forEach(attribute => {
                if (attribute.type === 'Spread') {
                    add_to_set(spread_dynamic_dependencies, Array.from(attribute.dependencies).filter((name) => this.is_dependency_dynamic(name)));
                }
                else {
                    const dynamic_dependencies = Array.from(attribute.dependencies).filter((name) => this.is_dependency_dynamic(name));
                    if (dynamic_dependencies.length > 0) {
                        changes.properties.push(p `${attribute.name}: ${renderer.dirty(dynamic_dependencies)}`);
                    }
                }
            });
            renderer.blocks.push(b `
				const ${get_slot_changes_fn} = #dirty => ${changes};
				const ${get_slot_context_fn} = #ctx => ${get_slot_data(this.node.values, block)};
			`);
            if (spread_dynamic_dependencies.size) {
                get_slot_spread_changes_fn = renderer.component.get_unique_name(`get_${sanitize(slot_name)}_slot_spread_changes`);
                renderer.blocks.push(b `
					const ${get_slot_spread_changes_fn} = #dirty => ${renderer.dirty(Array.from(spread_dynamic_dependencies))} > 0 ? -1 : 0;
				`);
            }
        }
        else {
            get_slot_changes_fn = 'null';
            get_slot_context_fn = 'null';
        }
        let has_fallback = !!this.fallback;
        if (this.fallback) {
            this.fragment.render(this.fallback, null, x `#nodes`);
            has_fallback = this.fallback.has_content();
            if (!has_fallback) {
                renderer.remove_block(this.fallback);
            }
        }
        const slot = block.get_unique_name(`${sanitize(slot_name)}_slot`);
        const slot_definition = block.get_unique_name(`${sanitize(slot_name)}_slot_template`);
        const slot_or_fallback = has_fallback ? block.get_unique_name(`${sanitize(slot_name)}_slot_or_fallback`) : slot;
        block.chunks.init.push(b `
			const ${slot_definition} = ${renderer.reference('#slots')}.${slot_name};
			const ${slot} = @create_slot(${slot_definition}, #ctx, ${renderer.reference('$$scope')}, ${get_slot_context_fn});
			${has_fallback ? b `const ${slot_or_fallback} = ${slot} || ${this.fallback.name}(#ctx);` : null}
		`);
        block.chunks.create.push(b `if (${slot_or_fallback}) ${slot_or_fallback}.c();`);
        if (renderer.options.hydratable) {
            block.chunks.claim.push(b `if (${slot_or_fallback}) ${slot_or_fallback}.l(${parent_nodes});`);
        }
        block.chunks.mount.push(b `
			if (${slot_or_fallback}) {
				${slot_or_fallback}.m(${parent_node || '#target'}, ${parent_node ? 'null' : '#anchor'});
			}
		`);
        block.chunks.intro.push(b `@transition_in(${slot_or_fallback}, #local);`);
        block.chunks.outro.push(b `@transition_out(${slot_or_fallback}, #local);`);
        const dynamic_dependencies = Array.from(this.dependencies).filter((name) => this.is_dependency_dynamic(name));
        const fallback_dynamic_dependencies = has_fallback
            ? Array.from(this.fallback.dependencies).filter((name) => this.is_dependency_dynamic(name))
            : [];
        const slot_update = get_slot_spread_changes_fn ? b `
			if (${slot}.p && ${renderer.dirty(dynamic_dependencies)}) {
				@update_slot_spread(${slot}, ${slot_definition}, #ctx, ${renderer.reference('$$scope')}, #dirty, ${get_slot_changes_fn}, ${get_slot_spread_changes_fn}, ${get_slot_context_fn});
			}
		` : b `
			if (${slot}.p && ${renderer.dirty(dynamic_dependencies)}) {
				@update_slot(${slot}, ${slot_definition}, #ctx, ${renderer.reference('$$scope')}, #dirty, ${get_slot_changes_fn}, ${get_slot_context_fn});
			}
		`;
        const fallback_update = has_fallback && fallback_dynamic_dependencies.length > 0 && b `
			if (${slot_or_fallback} && ${slot_or_fallback}.p && ${renderer.dirty(fallback_dynamic_dependencies)}) {
				${slot_or_fallback}.p(#ctx, #dirty);
			}
		`;
        if (fallback_update) {
            block.chunks.update.push(b `
				if (${slot}) {
					${slot_update}
				} else {
					${fallback_update}
				}
			`);
        }
        else {
            block.chunks.update.push(b `
				if (${slot}) {
					${slot_update}
				}
			`);
        }
        block.chunks.destroy.push(b `if (${slot_or_fallback}) ${slot_or_fallback}.d(detaching);`);
    }
    is_dependency_dynamic(name) {
        if (name === '$$scope')
            return true;
        if (this.node.scope.is_let(name))
            return true;
        if (is_reserved_keyword(name))
            return true;
        const variable = this.renderer.component.var_lookup.get(name);
        return is_dynamic$1(variable);
    }
}

class TitleWrapper extends Wrapper {
    constructor(renderer, block, parent, node, _strip_whitespace, _next_sibling) {
        super(renderer, block, parent, node);
    }
    render(block, _parent_node, _parent_nodes) {
        const is_dynamic = !!this.node.children.find(node => node.type !== 'Text');
        if (is_dynamic) {
            let value;
            const all_dependencies = new Set();
            // TODO some of this code is repeated in Tag.ts — would be good to
            // DRY it out if that's possible without introducing crazy indirection
            if (this.node.children.length === 1) {
                // single {tag} — may be a non-string
                // @ts-ignore todo: check this
                const { expression } = this.node.children[0];
                value = expression.manipulate(block);
                add_to_set(all_dependencies, expression.dependencies);
            }
            else {
                // '{foo} {bar}' — treat as string concatenation
                value = this.node.children
                    .map(chunk => {
                    if (chunk.type === 'Text')
                        return string_literal(chunk.data);
                    chunk.expression.dependencies.forEach(d => {
                        all_dependencies.add(d);
                    });
                    return chunk.expression.manipulate(block);
                })
                    .reduce((lhs, rhs) => x `${lhs} + ${rhs}`);
                if (this.node.children[0].type !== 'Text') {
                    value = x `"" + ${value}`;
                }
            }
            const last = this.node.should_cache && block.get_unique_name('title_value');
            if (this.node.should_cache)
                block.add_variable(last);
            const init = this.node.should_cache ? x `${last} = ${value}` : value;
            block.chunks.init.push(b `@_document.title = ${init};`);
            const updater = b `@_document.title = ${this.node.should_cache ? last : value};`;
            if (all_dependencies.size) {
                const dependencies = Array.from(all_dependencies);
                let condition = block.renderer.dirty(dependencies);
                if (block.has_outros) {
                    condition = x `!#current || ${condition}`;
                }
                if (this.node.should_cache) {
                    condition = x `${condition} && (${last} !== (${last} = ${value}))`;
                }
                block.chunks.update.push(b `
					if (${condition}) {
						${updater}
					}`);
            }
        }
        else {
            const value = this.node.children.length > 0
                ? string_literal(this.node.children[0].data)
                : x `""`;
            block.chunks.hydrate.push(b `@_document.title = ${value};`);
        }
    }
}

const associated_events = {
    innerWidth: 'resize',
    innerHeight: 'resize',
    outerWidth: 'resize',
    outerHeight: 'resize',
    scrollX: 'scroll',
    scrollY: 'scroll'
};
const properties$1 = {
    scrollX: 'pageXOffset',
    scrollY: 'pageYOffset'
};
const readonly = new Set([
    'innerWidth',
    'innerHeight',
    'outerWidth',
    'outerHeight',
    'online'
]);
class WindowWrapper extends Wrapper {
    constructor(renderer, block, parent, node) {
        super(renderer, block, parent, node);
        this.handlers = this.node.handlers.map(handler => new EventHandlerWrapper(handler, this));
    }
    render(block, _parent_node, _parent_nodes) {
        const { renderer } = this;
        const { component } = renderer;
        const events = {};
        const bindings = {};
        add_actions(block, '@_window', this.node.actions);
        add_event_handlers(block, '@_window', this.handlers);
        this.node.bindings.forEach(binding => {
            // TODO: what if it's a MemberExpression?
            const binding_name = binding.expression.node.name;
            // in dev mode, throw if read-only values are written to
            if (readonly.has(binding.name)) {
                renderer.readonly.add(binding_name);
            }
            bindings[binding.name] = binding_name;
            // bind:online is a special case, we need to listen for two separate events
            if (binding.name === 'online')
                return;
            const associated_event = associated_events[binding.name];
            const property = properties$1[binding.name] || binding.name;
            if (!events[associated_event])
                events[associated_event] = [];
            events[associated_event].push({
                name: binding_name,
                value: property
            });
        });
        const scrolling = block.get_unique_name('scrolling');
        const clear_scrolling = block.get_unique_name('clear_scrolling');
        const scrolling_timeout = block.get_unique_name('scrolling_timeout');
        Object.keys(events).forEach(event => {
            const id = block.get_unique_name(`onwindow${event}`);
            const props = events[event];
            renderer.add_to_context(id.name);
            const fn = renderer.reference(id.name);
            if (event === 'scroll') {
                // TODO other bidirectional bindings...
                block.add_variable(scrolling, x `false`);
                block.add_variable(clear_scrolling, x `() => { ${scrolling} = false }`);
                block.add_variable(scrolling_timeout);
                const condition = bindings.scrollX && bindings.scrollY
                    ? x `"${bindings.scrollX}" in this._state || "${bindings.scrollY}" in this._state`
                    : x `"${bindings.scrollX || bindings.scrollY}" in this._state`;
                const scrollX = bindings.scrollX && x `this._state.${bindings.scrollX}`;
                const scrollY = bindings.scrollY && x `this._state.${bindings.scrollY}`;
                renderer.meta_bindings.push(b `
					if (${condition}) {
						@_scrollTo(${scrollX || '@_window.pageXOffset'}, ${scrollY || '@_window.pageYOffset'});
					}
					${scrollX && `${scrollX} = @_window.pageXOffset;`}
					${scrollY && `${scrollY} = @_window.pageYOffset;`}
				`);
                block.event_listeners.push(x `
					@listen(@_window, "${event}", () => {
						${scrolling} = true;
						@_clearTimeout(${scrolling_timeout});
						${scrolling_timeout} = @_setTimeout(${clear_scrolling}, 100);
						${fn}();
					})
				`);
            }
            else {
                props.forEach(prop => {
                    renderer.meta_bindings.push(b `this._state.${prop.name} = @_window.${prop.value};`);
                });
                block.event_listeners.push(x `
					@listen(@_window, "${event}", ${fn})
				`);
            }
            component.partly_hoisted.push(b `
				function ${id}() {
					${props.map(prop => renderer.invalidate(prop.name, x `${prop.name} = @_window.${prop.value}`))}
				}
			`);
            block.chunks.init.push(b `
				@add_render_callback(${fn});
			`);
            component.has_reactive_assignments = true;
        });
        // special case... might need to abstract this out if we add more special cases
        if (bindings.scrollX || bindings.scrollY) {
            const condition = renderer.dirty([bindings.scrollX, bindings.scrollY].filter(Boolean));
            const scrollX = bindings.scrollX ? renderer.reference(bindings.scrollX) : x `@_window.pageXOffset`;
            const scrollY = bindings.scrollY ? renderer.reference(bindings.scrollY) : x `@_window.pageYOffset`;
            block.chunks.update.push(b `
				if (${condition} && !${scrolling}) {
					${scrolling} = true;
					@_clearTimeout(${scrolling_timeout});
					@_scrollTo(${scrollX}, ${scrollY});
					${scrolling_timeout} = @_setTimeout(${clear_scrolling}, 100);
				}
			`);
        }
        // another special case. (I'm starting to think these are all special cases.)
        if (bindings.online) {
            const id = block.get_unique_name('onlinestatuschanged');
            const name = bindings.online;
            renderer.add_to_context(id.name);
            const reference = renderer.reference(id.name);
            component.partly_hoisted.push(b `
				function ${id}() {
					${renderer.invalidate(name, x `${name} = @_navigator.onLine`)}
				}
			`);
            block.chunks.init.push(b `
				@add_render_callback(${reference});
			`);
            block.event_listeners.push(x `@listen(@_window, "online", ${reference})`, x `@listen(@_window, "offline", ${reference})`);
            component.has_reactive_assignments = true;
        }
    }
}

function link(next, prev) {
    prev.next = next;
    if (next)
        next.prev = prev;
}

const wrappers = {
    AwaitBlock: AwaitBlockWrapper,
    Body: BodyWrapper,
    Comment: null,
    DebugTag: DebugTagWrapper,
    EachBlock: EachBlockWrapper,
    Element: ElementWrapper,
    Head: HeadWrapper,
    IfBlock: IfBlockWrapper,
    InlineComponent: InlineComponentWrapper,
    KeyBlock: KeyBlockWrapper,
    MustacheTag: MustacheTagWrapper,
    Options: null,
    RawMustacheTag: RawMustacheTagWrapper,
    Slot: SlotWrapper,
    SlotTemplate: SlotTemplateWrapper,
    Text: TextWrapper,
    Title: TitleWrapper,
    Window: WindowWrapper
};
function trimmable_at(child, next_sibling) {
    // Whitespace is trimmable if one of the following is true:
    // The child and its sibling share a common nearest each block (not at an each block boundary)
    // The next sibling's previous node is an each block
    return (next_sibling.node.find_nearest(/EachBlock/) === child.find_nearest(/EachBlock/)) || next_sibling.node.prev.type === 'EachBlock';
}
class FragmentWrapper {
    constructor(renderer, block, nodes, parent, strip_whitespace, next_sibling) {
        this.nodes = [];
        let last_child;
        let window_wrapper;
        let i = nodes.length;
        while (i--) {
            const child = nodes[i];
            if (!child.type) {
                throw new Error('missing type');
            }
            if (!(child.type in wrappers)) {
                throw new Error(`TODO implement ${child.type}`);
            }
            // special case — this is an easy way to remove whitespace surrounding
            // <svelte:window/>. lil hacky but it works
            if (child.type === 'Window') {
                window_wrapper = new WindowWrapper(renderer, block, parent, child);
                continue;
            }
            if (child.type === 'Text') {
                let { data } = child;
                // We want to remove trailing whitespace inside an element/component/block,
                // *unless* there is no whitespace between this node and its next sibling
                if (this.nodes.length === 0) {
                    const should_trim = (next_sibling ? (next_sibling.node.type === 'Text' && /^\s/.test(next_sibling.node.data) && trimmable_at(child, next_sibling)) : !child.has_ancestor('EachBlock'));
                    if (should_trim) {
                        data = trim_end(data);
                        if (!data)
                            continue;
                    }
                }
                // glue text nodes (which could e.g. be separated by comments) together
                if (last_child && last_child.node.type === 'Text') {
                    last_child.data = data + last_child.data;
                    continue;
                }
                const wrapper = new TextWrapper(renderer, block, parent, child, data);
                if (wrapper.skip)
                    continue;
                this.nodes.unshift(wrapper);
                link(last_child, last_child = wrapper);
            }
            else {
                const Wrapper = wrappers[child.type];
                if (!Wrapper)
                    continue;
                const wrapper = new Wrapper(renderer, block, parent, child, strip_whitespace, last_child || next_sibling);
                this.nodes.unshift(wrapper);
                link(last_child, last_child = wrapper);
            }
        }
        if (strip_whitespace) {
            const first = this.nodes[0];
            if (first && first.node.type === 'Text') {
                first.data = trim_start(first.data);
                if (!first.data) {
                    first.var = null;
                    this.nodes.shift();
                    if (this.nodes[0]) {
                        this.nodes[0].prev = null;
                    }
                }
            }
        }
        if (window_wrapper) {
            this.nodes.unshift(window_wrapper);
            link(last_child, window_wrapper);
        }
    }
    render(block, parent_node, parent_nodes) {
        for (let i = 0; i < this.nodes.length; i += 1) {
            this.nodes[i].render(block, parent_node, parent_nodes);
        }
    }
}

class Renderer {
    constructor(component, options) {
        this.context = [];
        this.initial_context = [];
        this.context_lookup = new Map();
        this.blocks = [];
        this.readonly = new Set();
        this.meta_bindings = []; // initial values for e.g. window.innerWidth, if there's a <svelte:window> meta tag
        this.binding_groups = new Map();
        this.component = component;
        this.options = options;
        this.locate = component.locate; // TODO messy
        this.file_var = options.dev && this.component.get_unique_name('file');
        component.vars.filter(v => !v.hoistable || (v.export_name && !v.module)).forEach(v => this.add_to_context(v.name));
        // ensure store values are included in context
        component.vars.filter(v => v.subscribable).forEach(v => this.add_to_context(`$${v.name}`));
        reserved_keywords.forEach(keyword => {
            if (component.var_lookup.has(keyword)) {
                this.add_to_context(keyword);
            }
        });
        if (component.slots.size > 0) {
            this.add_to_context('$$scope');
            this.add_to_context('#slots');
        }
        if (this.binding_groups.size > 0) {
            this.add_to_context('$$binding_groups');
        }
        // main block
        this.block = new Block$1({
            renderer: this,
            name: null,
            type: 'component',
            key: null,
            bindings: new Map(),
            dependencies: new Set()
        });
        this.block.has_update_method = true;
        this.fragment = new FragmentWrapper(this, this.block, component.fragment.children, null, true, null);
        // TODO messy
        this.blocks.forEach(block => {
            if (block instanceof Block$1) {
                block.assign_variable_names();
            }
        });
        this.block.assign_variable_names();
        this.fragment.render(this.block, null, x `#nodes`);
        this.context_overflow = this.context.length > 31;
        this.context.forEach(member => {
            const { variable } = member;
            if (variable) {
                member.priority += 2;
                if (variable.mutated || variable.reassigned)
                    member.priority += 4;
                // these determine whether variable is included in initial context
                // array, so must have the highest priority
                if (variable.is_reactive_dependency && (variable.mutated || variable.reassigned))
                    member.priority += 16;
                if (variable.export_name)
                    member.priority += 32;
                if (variable.referenced)
                    member.priority += 64;
            }
            else if (member.is_non_contextual) {
                // determine whether variable is included in initial context
                // array, so must have the highest priority
                member.priority += 8;
            }
            if (!member.is_contextual) {
                member.priority += 1;
            }
        });
        this.context.sort((a, b) => (b.priority - a.priority) || (a.index.value - b.index.value));
        this.context.forEach((member, i) => member.index.value = i);
        let i = this.context.length;
        while (i--) {
            const member = this.context[i];
            if (member.variable) {
                if (member.variable.referenced || member.variable.export_name || (member.variable.is_reactive_dependency && (member.variable.mutated || member.variable.reassigned)))
                    break;
            }
            else if (member.is_non_contextual) {
                break;
            }
        }
        this.initial_context = this.context.slice(0, i + 1);
    }
    add_to_context(name, contextual = false) {
        if (!this.context_lookup.has(name)) {
            const member = {
                name,
                index: { type: 'Literal', value: this.context.length },
                is_contextual: false,
                is_non_contextual: false,
                variable: null,
                priority: 0
            };
            this.context_lookup.set(name, member);
            this.context.push(member);
        }
        const member = this.context_lookup.get(name);
        if (contextual) {
            member.is_contextual = true;
        }
        else {
            member.is_non_contextual = true;
            member.variable = this.component.var_lookup.get(name);
        }
        return member;
    }
    invalidate(name, value, main_execution_context = false) {
        return renderer_invalidate(this, name, value, main_execution_context);
    }
    dirty(names, is_reactive_declaration = false) {
        const renderer = this;
        const dirty = (is_reactive_declaration
            ? x `$$self.$$.dirty`
            : x `#dirty`);
        const get_bitmask = () => {
            const bitmask = [];
            names.forEach((name) => {
                const member = renderer.context_lookup.get(name);
                if (!member)
                    return;
                if (member.index.value === -1) {
                    throw new Error('unset index');
                }
                const value = member.index.value;
                const i = (value / 31) | 0;
                const n = 1 << (value % 31);
                if (!bitmask[i])
                    bitmask[i] = { n: 0, names: [] };
                bitmask[i].n |= n;
                bitmask[i].names.push(name);
            });
            return bitmask;
        };
        // TODO: context-overflow make it less gross
        return {
            // Using a ParenthesizedExpression allows us to create
            // the expression lazily. TODO would be better if
            // context was determined before rendering, so that
            // this indirection was unnecessary
            type: 'ParenthesizedExpression',
            get expression() {
                const bitmask = get_bitmask();
                if (!bitmask.length) {
                    return x `${dirty} & /*${names.join(', ')}*/ 0`;
                }
                if (renderer.context_overflow) {
                    return bitmask
                        .map((b, i) => ({ b, i }))
                        .filter(({ b }) => b)
                        .map(({ b, i }) => x `${dirty}[${i}] & /*${b.names.join(', ')}*/ ${b.n}`)
                        .reduce((lhs, rhs) => x `${lhs} | ${rhs}`);
                }
                return x `${dirty} & /*${names.join(', ')}*/ ${bitmask[0].n}`;
            }
        };
    }
    reference(node) {
        if (typeof node === 'string') {
            node = { type: 'Identifier', name: node };
        }
        const { name, nodes } = flatten_reference(node);
        const member = this.context_lookup.get(name);
        // TODO is this correct?
        if (this.component.var_lookup.get(name)) {
            this.component.add_reference(name);
        }
        if (member !== undefined) {
            const replacement = x `/*${member.name}*/ #ctx[${member.index}]`;
            if (nodes[0].loc)
                replacement.object.loc = nodes[0].loc;
            nodes[0] = replacement;
            return nodes.reduce((lhs, rhs) => x `${lhs}.${rhs}`);
        }
        return node;
    }
    remove_block(block) {
        this.blocks.splice(this.blocks.indexOf(block), 1);
    }
}

var charToInteger$1 = {};
var chars$1 = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=';
for (var i$2 = 0; i$2 < chars$1.length; i$2++) {
    charToInteger$1[chars$1.charCodeAt(i$2)] = i$2;
}
function decode$1(mappings) {
    var decoded = [];
    var line = [];
    var segment = [
        0,
        0,
        0,
        0,
        0,
    ];
    var j = 0;
    for (var i = 0, shift = 0, value = 0; i < mappings.length; i++) {
        var c = mappings.charCodeAt(i);
        if (c === 44) { // ","
            segmentify$1(line, segment, j);
            j = 0;
        }
        else if (c === 59) { // ";"
            segmentify$1(line, segment, j);
            j = 0;
            decoded.push(line);
            line = [];
            segment[0] = 0;
        }
        else {
            var integer = charToInteger$1[c];
            if (integer === undefined) {
                throw new Error('Invalid character (' + String.fromCharCode(c) + ')');
            }
            var hasContinuationBit = integer & 32;
            integer &= 31;
            value += integer << shift;
            if (hasContinuationBit) {
                shift += 5;
            }
            else {
                var shouldNegate = value & 1;
                value >>>= 1;
                if (shouldNegate) {
                    value = value === 0 ? -0x80000000 : -value;
                }
                segment[j] += value;
                j++;
                value = shift = 0; // reset
            }
        }
    }
    segmentify$1(line, segment, j);
    decoded.push(line);
    return decoded;
}
function segmentify$1(line, segment, j) {
    // This looks ugly, but we're creating specialized arrays with a specific
    // length. This is much faster than creating a new array (which v8 expands to
    // a capacity of 17 after pushing the first item), or slicing out a subarray
    // (which is slow). Length 4 is assumed to be the most frequent, followed by
    // length 5 (since not everything will have an associated name), followed by
    // length 1 (it's probably rare for a source substring to not have an
    // associated segment data).
    if (j === 4)
        line.push([segment[0], segment[1], segment[2], segment[3]]);
    else if (j === 5)
        line.push([segment[0], segment[1], segment[2], segment[3], segment[4]]);
    else if (j === 1)
        line.push([segment[0]]);
}
function encode$1(decoded) {
    var sourceFileIndex = 0; // second field
    var sourceCodeLine = 0; // third field
    var sourceCodeColumn = 0; // fourth field
    var nameIndex = 0; // fifth field
    var mappings = '';
    for (var i = 0; i < decoded.length; i++) {
        var line = decoded[i];
        if (i > 0)
            mappings += ';';
        if (line.length === 0)
            continue;
        var generatedCodeColumn = 0; // first field
        var lineMappings = [];
        for (var _i = 0, line_1 = line; _i < line_1.length; _i++) {
            var segment = line_1[_i];
            var segmentMappings = encodeInteger$1(segment[0] - generatedCodeColumn);
            generatedCodeColumn = segment[0];
            if (segment.length > 1) {
                segmentMappings +=
                    encodeInteger$1(segment[1] - sourceFileIndex) +
                        encodeInteger$1(segment[2] - sourceCodeLine) +
                        encodeInteger$1(segment[3] - sourceCodeColumn);
                sourceFileIndex = segment[1];
                sourceCodeLine = segment[2];
                sourceCodeColumn = segment[3];
            }
            if (segment.length === 5) {
                segmentMappings += encodeInteger$1(segment[4] - nameIndex);
                nameIndex = segment[4];
            }
            lineMappings.push(segmentMappings);
        }
        mappings += lineMappings.join(',');
    }
    return mappings;
}
function encodeInteger$1(num) {
    var result = '';
    num = num < 0 ? (-num << 1) | 1 : num << 1;
    do {
        var clamped = num & 31;
        num >>>= 5;
        if (num > 0) {
            clamped |= 32;
        }
        result += chars$1[clamped];
    } while (num > 0);
    return result;
}

/**
 * Copyright 2019 The AMP HTML Authors. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**
 * Creates a brand new (prototype-less) object with the enumerable-own
 * properties of `target`. Any enumerable-own properties from `source` which
 * are not present on `target` will be copied as well.
 */
function defaults(target, source) {
    return Object.assign(Object.create(null), source, target);
}

/**
 * Copyright 2019 The AMP HTML Authors. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**
 * Decodes an input sourcemap into a `DecodedSourceMap` sourcemap object.
 *
 * Valid input maps include a `DecodedSourceMap`, a `RawSourceMap`, or JSON
 * representations of either type.
 */
function decodeSourceMap(map) {
    if (typeof map === 'string') {
        map = JSON.parse(map);
    }
    let { mappings } = map;
    if (typeof mappings === 'string') {
        mappings = decode$1(mappings);
    }
    else {
        // Clone the Line so that we can sort it. We don't want to mutate an array
        // that we don't own directly.
        mappings = mappings.map(cloneSegmentLine);
    }
    // Sort each Line's segments. There's no guarantee that segments are sorted for us,
    // and even Chrome's implementation sorts:
    // https://cs.chromium.org/chromium/src/third_party/devtools-frontend/src/front_end/sdk/SourceMap.js?l=507-508&rcl=109232bcf479c8f4ef8ead3cf56c49eb25f8c2f0
    mappings.forEach(sortSegments);
    return defaults({ mappings }, map);
}
function cloneSegmentLine(segments) {
    return segments.slice();
}
function sortSegments(segments) {
    segments.sort(segmentComparator);
}
function segmentComparator(a, b) {
    return a[0] - b[0];
}

/**
 * Copyright 2019 The AMP HTML Authors. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**
 * A "leaf" node in the sourcemap tree, representing an original, unmodified
 * source file. Recursive segment tracing ends at the `OriginalSource`.
 */
class OriginalSource {
    constructor(filename, content) {
        this.filename = filename;
        this.content = content;
    }
    /**
     * Tracing a `SourceMapSegment` ends when we get to an `OriginalSource`,
     * meaning this line/column location originated from this source file.
     */
    traceSegment(line, column, name) {
        return { column, line, name, source: this };
    }
}

/* istanbul ignore next */
const Url$1 = (typeof URL !== 'undefined' ? URL : require('url').URL);
// Matches "..", which must be preceeded by "/" or the start of the string, and
// must be followed by a "/". We do not eat the following "/", so that the next
// iteration can match on it.
const parentRegex = /(^|\/)\.\.(?=\/|$)/g;
function isAbsoluteUrl(url) {
    try {
        return !!new Url$1(url);
    }
    catch (e) {
        return false;
    }
}
/**
 * Creates a directory name that is guaranteed to not be in `str`.
 */
function uniqInStr(str) {
    let uniq = String(Math.random()).slice(2);
    while (str.indexOf(uniq) > -1) {
        /* istanbul ignore next */
        uniq += uniq;
    }
    return uniq;
}
/**
 * Removes the filename from the path (everything trailing the last "/"). This
 * is only safe to call on a path, never call with an absolute or protocol
 * relative URL.
 */
function stripPathFilename(path) {
    path = normalizePath(path);
    const index = path.lastIndexOf('/');
    return path.slice(0, index + 1);
}
/**
 * Normalizes a protocol-relative URL, but keeps it protocol relative by
 * stripping out the protocl before returning it.
 */
function normalizeProtocolRelative(input, absoluteBase) {
    const { href, protocol } = new Url$1(input, absoluteBase);
    return href.slice(protocol.length);
}
/**
 * Normalizes a simple path (one that has no ".."s, or is absolute so ".."s can
 * be normalized absolutely).
 */
function normalizeSimplePath(input) {
    const { href } = new Url$1(input, 'https://foo.com/');
    return href.slice('https://foo.com/'.length);
}
/**
 * Normalizes a path, ensuring that excess ".."s are preserved for relative
 * paths in the output.
 *
 * If the input is absolute, this will return an absolutey normalized path, but
 * it will not have a leading "/".
 *
 * If the input has a leading "..", the output will have a leading "..".
 *
 * If the input has a leading ".", the output will not have a leading "."
 * unless there are too many ".."s, in which case there will be a leading "..".
 */
function normalizePath(input) {
    // If there are no ".."s, we can treat this as if it were an absolute path.
    // The return won't be an absolute path, so it's easy.
    if (!parentRegex.test(input))
        return normalizeSimplePath(input);
    // We already found one "..". Let's see how many there are.
    let total = 1;
    while (parentRegex.test(input))
        total++;
    // If there are ".."s, we need to prefix the the path with the same number of
    // unique directories. This is to ensure that we "remember" how many parent
    // directories we are accessing. Eg, "../../.." must keep 3, and "foo/../.."
    // must keep 1.
    const uniqDirectory = `z${uniqInStr(input)}/`;
    // uniqDirectory is just a "z", followed by numbers, followed by a "/". So
    // generating a runtime regex from it is safe. We'll use this search regex to
    // strip out our uniq directory names and insert any needed ".."s.
    const search = new RegExp(`^(?:${uniqDirectory})*`);
    // Now we can resolve the total path. If there are excess ".."s, they will
    // eliminate one or more of the unique directories we prefix with.
    const relative = normalizeSimplePath(uniqDirectory.repeat(total) + input);
    // We can now count the number of unique directories that were eliminated. If
    // there were 3, and 1 was eliminated, we know we only need to add 1 "..". If
    // 2 were eliminated, we need to insert 2 ".."s. If all 3 were eliminated,
    // then we need 3, etc. This replace is guranteed to match (it may match 0 or
    // more times), and we can count the total match to see how many were eliminated.
    return relative.replace(search, (all) => {
        const leftover = all.length / uniqDirectory.length;
        return '../'.repeat(total - leftover);
    });
}
/**
 * Attempts to resolve `input` URL relative to `base`.
 */
function resolve(input, base) {
    if (!base)
        base = '';
    // Absolute URLs are very easy to resolve right.
    if (isAbsoluteUrl(input))
        return new Url$1(input).href;
    if (base) {
        // Absolute URLs are easy...
        if (isAbsoluteUrl(base))
            return new Url$1(input, base).href;
        // If base is protocol relative, we'll resolve with it but keep the result
        // protocol relative.
        if (base.startsWith('//'))
            return normalizeProtocolRelative(input, `https:${base}`);
    }
    // Normalize input, but keep it protocol relative. We know base doesn't supply
    // a protocol, because that would have been handled above.
    if (input.startsWith('//'))
        return normalizeProtocolRelative(input, 'https://foo.com/');
    // We now know that base (if there is one) and input are paths. We've handled
    // both absolute and protocol-relative variations above.
    // Absolute paths don't need any special handling, because they cannot have
    // extra "." or ".."s. That'll all be stripped away. Input takes priority here,
    // because if input is an absolute path, base path won't affect it in any way.
    if (input.startsWith('/'))
        return '/' + normalizeSimplePath(input);
    // Since input and base are paths, we need to join them to do any further
    // processing. Paths are joined at the directory level, so we need to remove
    // the base's filename before joining. We also know that input does not have a
    // leading slash, and that the stripped base will have a trailing slash if
    // there are any directories (or it'll be empty).
    const joined = stripPathFilename(base) + input;
    // If base is an absolute path, then input will be relative to it.
    if (base.startsWith('/'))
        return '/' + normalizeSimplePath(joined);
    // We now know both base (if there is one) and input are relative paths.
    const relative = normalizePath(joined);
    // If base started with a leading ".", or there is no base and input started
    // with a ".", then we need to ensure that the relative path starts with a
    // ".". We don't know if relative starts with a "..", though, so check before
    // prepending.
    if ((base || input).startsWith('.') && !relative.startsWith('.')) {
        return './' + relative;
    }
    return relative;
}

/**
 * Copyright 2019 The AMP HTML Authors. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
function resolve$1(input, base) {
    // The base is always treated as a directory, if it's not empty.
    // https://github.com/mozilla/source-map/blob/8cb3ee57/lib/util.js#L327
    // https://github.com/chromium/chromium/blob/da4adbb3/third_party/blink/renderer/devtools/front_end/sdk/SourceMap.js#L400-L401
    if (base && !base.endsWith('/'))
        base += '/';
    return resolve(input, base);
}

/**
 * Copyright 2019 The AMP HTML Authors. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**
 * A binary search implementation that returns the index if a match is found,
 * or the negated index of where the `needle` should be inserted.
 *
 * The `comparator` callback receives both the `item` under comparison and the
 * needle we are searching for. It must return `0` if the `item` is a match,
 * any negative number if `item` is too small (and we must search after it), or
 * any positive number if the `item` is too large (and we must search before
 * it).
 *
 * If no match is found, a negated index of where to insert the `needle` is
 * returned. This negated index is guaranteed to be less than 0. To insert an
 * item, negate it (again) and splice:
 *
 * ```js
 * const array = [1, 3];
 * const needle = 2;
 * const index = binarySearch(array, needle, (item, needle) => item - needle);
 *
 * assert.equal(index, -2);
 * assert.equal(~index, 1);
 * array.splice(~index, 0, needle);
 * assert.deepEqual(array, [1, 2, 3]);
 * ```
 */
function binarySearch(haystack, needle, comparator) {
    let low = 0;
    let high = haystack.length - 1;
    while (low <= high) {
        const mid = low + ((high - low) >> 1);
        const cmp = comparator(haystack[mid], needle);
        if (cmp === 0) {
            return mid;
        }
        if (cmp < 0) {
            low = mid + 1;
        }
        else {
            high = mid - 1;
        }
    }
    return ~low;
}

/**
 * Copyright 2019 The AMP HTML Authors. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**
 * FastStringArray acts like a `Set` (allowing only one occurrence of a string
 * `key`), but provides the index of the `key` in the backing array.
 *
 * This is designed to allow synchronizing a second array with the contents of
 * the backing array, like how `sourcesContent[i]` is the source content
 * associated with `source[i]`, and there are never duplicates.
 */
class FastStringArray {
    constructor() {
        this.indexes = Object.create(null);
        this.array = [];
    }
    /**
     * Puts `key` into the backing array, if it is not already present. Returns
     * the index of the `key` in the backing array.
     */
    put(key) {
        const { array, indexes } = this;
        // The key may or may not be present. If it is present, it's a number.
        let index = indexes[key];
        // If it's not yet present, we need to insert it and track the index in the
        // indexes.
        if (index === undefined) {
            index = indexes[key] = array.length;
            array.push(key);
        }
        return index;
    }
}

/**
 * Copyright 2019 The AMP HTML Authors. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**
 * SourceMapTree represents a single sourcemap, with the ability to trace
 * mappings into its child nodes (which may themselves be SourceMapTrees).
 */
class SourceMapTree {
    constructor(map, sources) {
        this.map = map;
        this.sources = sources;
    }
    /**
     * traceMappings is only called on the root level SourceMapTree, and begins
     * the process of resolving each mapping in terms of the original source
     * files.
     */
    traceMappings() {
        const mappings = [];
        const names = new FastStringArray();
        const sources = new FastStringArray();
        const sourcesContent = [];
        const { mappings: rootMappings, names: rootNames } = this.map;
        for (let i = 0; i < rootMappings.length; i++) {
            const segments = rootMappings[i];
            const tracedSegments = [];
            for (let j = 0; j < segments.length; j++) {
                const segment = segments[j];
                // 1-length segments only move the current generated column, there's no
                // source information to gather from it.
                if (segment.length === 1)
                    continue;
                const source = this.sources[segment[1]];
                const traced = source.traceSegment(segment[2], segment[3], segment.length === 5 ? rootNames[segment[4]] : '');
                if (!traced)
                    continue;
                // So we traced a segment down into its original source file. Now push a
                // new segment pointing to this location.
                const { column, line, name } = traced;
                const { content, filename } = traced.source;
                // Store the source location, and ensure we keep sourcesContent up to
                // date with the sources array.
                const sourceIndex = sources.put(filename);
                sourcesContent[sourceIndex] = content;
                // This looks like unnecessary duplication, but it noticeably increases
                // performance. If we were to push the nameIndex onto length-4 array, v8
                // would internally allocate 22 slots! That's 68 wasted bytes! Array
                // literals have the same capacity as their length, saving memory.
                if (name) {
                    tracedSegments.push([segment[0], sourceIndex, line, column, names.put(name)]);
                }
                else {
                    tracedSegments.push([segment[0], sourceIndex, line, column]);
                }
            }
            mappings.push(tracedSegments);
        }
        // TODO: Make all sources relative to the sourceRoot.
        return defaults({
            mappings,
            names: names.array,
            sources: sources.array,
            sourcesContent,
        }, this.map);
    }
    /**
     * traceSegment is only called on children SourceMapTrees. It recurses down
     * into its own child SourceMapTrees, until we find the original source map.
     */
    traceSegment(line, column, name) {
        const { mappings, names } = this.map;
        // It's common for parent sourcemaps to have pointers to lines that have no
        // mapping (like a "//# sourceMappingURL=") at the end of the child file.
        if (line >= mappings.length)
            return null;
        const segments = mappings[line];
        if (segments.length === 0)
            return null;
        let index = binarySearch(segments, column, segmentComparator$1);
        if (index === -1)
            return null; // we come before any mapped segment
        // If we can't find a segment that lines up to this column, we use the
        // segment before.
        if (index < 0) {
            index = ~index - 1;
        }
        const segment = segments[index];
        // 1-length segments only move the current generated column, there's no
        // source information to gather from it.
        if (segment.length === 1)
            return null;
        const source = this.sources[segment[1]];
        // So now we can recurse down, until we hit the original source file.
        return source.traceSegment(segment[2], segment[3], 
        // A child map's recorded name for this segment takes precedence over the
        // parent's mapped name. Imagine a mangler changing the name over, etc.
        segment.length === 5 ? names[segment[4]] : name);
    }
}
function segmentComparator$1(segment, column) {
    return segment[0] - column;
}

/**
 * Copyright 2019 The AMP HTML Authors. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**
 * Removes the filename from a path.
 */
function stripFilename(path) {
    if (!path)
        return '';
    const index = path.lastIndexOf('/');
    return path.slice(0, index + 1);
}

/**
 * Copyright 2019 The AMP HTML Authors. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
function asArray(value) {
    if (Array.isArray(value))
        return value;
    return [value];
}
/**
 * Recursively builds a tree structure out of sourcemap files, with each node
 * being either an `OriginalSource` "leaf" or a `SourceMapTree` composed of
 * `OriginalSource`s and `SourceMapTree`s.
 *
 * Every sourcemap is composed of a collection of source files and mappings
 * into locations of those source files. When we generate a `SourceMapTree` for
 * the sourcemap, we attempt to load each source file's own sourcemap. If it
 * does not have an associated sourcemap, it is considered an original,
 * unmodified source file.
 */
function buildSourceMapTree(input, loader, relativeRoot) {
    const maps = asArray(input).map(decodeSourceMap);
    const map = maps.pop();
    for (let i = 0; i < maps.length; i++) {
        if (maps[i].sources.length !== 1) {
            throw new Error(`Transformation map ${i} must have exactly one source file.\n` +
                'Did you specify these with the most recent transformation maps first?');
        }
    }
    const { sourceRoot, sources, sourcesContent } = map;
    const children = sources.map((sourceFile, i) => {
        // Each source file is loaded relative to the sourcemap's own sourceRoot,
        // which is itself relative to the sourcemap's parent.
        const uri = resolve$1(sourceFile || '', resolve$1(sourceRoot || '', stripFilename(relativeRoot)));
        // Use the provided loader callback to retrieve the file's sourcemap.
        // TODO: We should eventually support async loading of sourcemap files.
        const sourceMap = loader(uri);
        // If there is no sourcemap, then it is an unmodified source file.
        if (!sourceMap) {
            // The source file's actual contents must be included in the sourcemap
            // (done when generating the sourcemap) for it to be included as a
            // sourceContent in the output sourcemap.
            const sourceContent = sourcesContent ? sourcesContent[i] : null;
            return new OriginalSource(uri, sourceContent);
        }
        // Else, it's a real sourcemap, and we need to recurse into it to load its
        // source files.
        return buildSourceMapTree(decodeSourceMap(sourceMap), loader, uri);
    });
    let tree = new SourceMapTree(map, children);
    for (let i = maps.length - 1; i >= 0; i--) {
        tree = new SourceMapTree(maps[i], [tree]);
    }
    return tree;
}

/**
 * Copyright 2019 The AMP HTML Authors. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**
 * A SourceMap v3 compatible sourcemap, which only includes fields that were
 * provided to it.
 */
class SourceMap {
    constructor(map, excludeContent) {
        this.version = 3; // SourceMap spec says this should be first.
        if ('file' in map)
            this.file = map.file;
        this.mappings = encode$1(map.mappings);
        this.names = map.names;
        // TODO: We first need to make all source URIs relative to the sourceRoot
        // before we can support a sourceRoot.
        // if ('sourceRoot' in map) this.sourceRoot = map.sourceRoot;
        this.sources = map.sources;
        if (!excludeContent && 'sourcesContent' in map)
            this.sourcesContent = map.sourcesContent;
    }
    toString() {
        return JSON.stringify(this);
    }
}

/**
 * Copyright 2019 The AMP HTML Authors. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**
 * Traces through all the mappings in the root sourcemap, through the sources
 * (and their sourcemaps), all the way back to the original source location.
 *
 * `loader` will be called every time we encounter a source file. If it returns
 * a sourcemap, we will recurse into that sourcemap to continue the trace. If
 * it returns a falsey value, that source file is treated as an original,
 * unmodified source file.
 *
 * Pass `excludeContent` content to exclude any self-containing source file
 * content from the output sourcemap.
 */
function remapping(input, loader, excludeContent) {
    const graph = buildSourceMapTree(input, loader);
    return new SourceMap(graph.traceMappings(), !!excludeContent);
}

function last_line_length(s) {
    return s.length - s.lastIndexOf('\n') - 1;
}
// mutate map in-place
function sourcemap_add_offset(map, offset, source_index) {
    if (map.mappings.length == 0)
        return;
    for (let line = 0; line < map.mappings.length; line++) {
        const segment_list = map.mappings[line];
        for (let segment = 0; segment < segment_list.length; segment++) {
            const seg = segment_list[segment];
            // shift only segments that belong to component source file
            if (seg[1] === source_index) { // also ensures that seg.length >= 4
                // shift column if it points at the first line
                if (seg[2] === 0) {
                    seg[3] += offset.column;
                }
                // shift line
                seg[2] += offset.line;
            }
        }
    }
}
function merge_tables(this_table, other_table) {
    const new_table = this_table.slice();
    const idx_map = [];
    other_table = other_table || [];
    let val_changed = false;
    for (const [other_idx, other_val] of other_table.entries()) {
        const this_idx = this_table.indexOf(other_val);
        if (this_idx >= 0) {
            idx_map[other_idx] = this_idx;
        }
        else {
            const new_idx = new_table.length;
            new_table[new_idx] = other_val;
            idx_map[other_idx] = new_idx;
            val_changed = true;
        }
    }
    let idx_changed = val_changed;
    if (val_changed) {
        if (idx_map.find((val, idx) => val != idx) === undefined) {
            // idx_map is identity map [0, 1, 2, 3, 4, ....]
            idx_changed = false;
        }
    }
    return [new_table, idx_map, val_changed, idx_changed];
}
function pushArray(_this, other) {
    // We use push to mutate in place for memory and perf reasons
    // We use the for loop instead of _this.push(...other) to avoid the JS engine's function argument limit (65,535 in JavascriptCore)
    for (let i = 0; i < other.length; i++) {
        _this.push(other[i]);
    }
}
class MappedCode {
    constructor(string = '', map = null) {
        this.string = string;
        if (map) {
            this.map = map;
        }
        else {
            this.map = {
                version: 3,
                mappings: [],
                sources: [],
                names: []
            };
        }
    }
    /**
     * concat in-place (mutable), return this (chainable)
     * will also mutate the `other` object
     */
    concat(other) {
        // noop: if one is empty, return the other
        if (other.string == '')
            return this;
        if (this.string == '') {
            this.string = other.string;
            this.map = other.map;
            return this;
        }
        // compute last line length before mutating
        const column_offset = last_line_length(this.string);
        this.string += other.string;
        const m1 = this.map;
        const m2 = other.map;
        if (m2.mappings.length == 0)
            return this;
        // combine sources and names
        const [sources, new_source_idx, sources_changed, sources_idx_changed] = merge_tables(m1.sources, m2.sources);
        const [names, new_name_idx, names_changed, names_idx_changed] = merge_tables(m1.names, m2.names);
        if (sources_changed)
            m1.sources = sources;
        if (names_changed)
            m1.names = names;
        // unswitched loops are faster
        if (sources_idx_changed && names_idx_changed) {
            for (let line = 0; line < m2.mappings.length; line++) {
                const segment_list = m2.mappings[line];
                for (let segment = 0; segment < segment_list.length; segment++) {
                    const seg = segment_list[segment];
                    if (seg[1] >= 0)
                        seg[1] = new_source_idx[seg[1]];
                    if (seg[4] >= 0)
                        seg[4] = new_name_idx[seg[4]];
                }
            }
        }
        else if (sources_idx_changed) {
            for (let line = 0; line < m2.mappings.length; line++) {
                const segment_list = m2.mappings[line];
                for (let segment = 0; segment < segment_list.length; segment++) {
                    const seg = segment_list[segment];
                    if (seg[1] >= 0)
                        seg[1] = new_source_idx[seg[1]];
                }
            }
        }
        else if (names_idx_changed) {
            for (let line = 0; line < m2.mappings.length; line++) {
                const segment_list = m2.mappings[line];
                for (let segment = 0; segment < segment_list.length; segment++) {
                    const seg = segment_list[segment];
                    if (seg[4] >= 0)
                        seg[4] = new_name_idx[seg[4]];
                }
            }
        }
        // combine the mappings
        // combine
        // 1. last line of first map
        // 2. first line of second map
        // columns of 2 must be shifted
        if (m2.mappings.length > 0 && column_offset > 0) {
            const first_line = m2.mappings[0];
            for (let i = 0; i < first_line.length; i++) {
                first_line[i][0] += column_offset;
            }
        }
        // combine last line + first line
        pushArray(m1.mappings[m1.mappings.length - 1], m2.mappings.shift());
        // append other lines
        pushArray(m1.mappings, m2.mappings);
        return this;
    }
    static from_processed(string, map) {
        const line_count = string.split('\n').length;
        if (map) {
            // ensure that count of source map mappings lines
            // is equal to count of generated code lines
            // (some tools may produce less)
            const missing_lines = line_count - map.mappings.length;
            for (let i = 0; i < missing_lines; i++) {
                map.mappings.push([]);
            }
            return new MappedCode(string, map);
        }
        if (string == '')
            return new MappedCode();
        map = { version: 3, names: [], sources: [], mappings: [] };
        // add empty SourceMapSegment[] for every line
        for (let i = 0; i < line_count; i++)
            map.mappings.push([]);
        return new MappedCode(string, map);
    }
    static from_source({ source, file_basename, get_location }) {
        let offset = get_location(0);
        if (!offset)
            offset = { line: 0, column: 0 };
        const map = { version: 3, names: [], sources: [file_basename], mappings: [] };
        if (source == '')
            return new MappedCode(source, map);
        // we create a high resolution identity map here,
        // we know that it will eventually be merged with svelte's map,
        // at which stage the resolution will decrease.
        const line_list = source.split('\n');
        for (let line = 0; line < line_list.length; line++) {
            map.mappings.push([]);
            const token_list = line_list[line].split(/([^\d\w\s]|\s+)/g);
            for (let token = 0, column = 0; token < token_list.length; token++) {
                if (token_list[token] == '')
                    continue;
                map.mappings[line].push([column, 0, offset.line + line, column]);
                column += token_list[token].length;
            }
        }
        // shift columns in first line
        const segment_list = map.mappings[0];
        for (let segment = 0; segment < segment_list.length; segment++) {
            segment_list[segment][3] += offset.column;
        }
        return new MappedCode(source, map);
    }
}
function combine_sourcemaps(filename, sourcemap_list) {
    if (sourcemap_list.length == 0)
        return null;
    let map_idx = 1;
    const map = sourcemap_list.slice(0, -1)
        .find(m => m.sources.length !== 1) === undefined
        ? remapping(// use array interface
        // only the oldest sourcemap can have multiple sources
        sourcemap_list, () => null, true // skip optional field `sourcesContent`
        )
        : remapping(// use loader interface
        sourcemap_list[0], // last map
        function loader(sourcefile) {
            if (sourcefile === filename && sourcemap_list[map_idx]) {
                return sourcemap_list[map_idx++]; // idx 1, 2, ...
                // bundle file = branch node
            }
            else {
                return null; // source file = leaf node
            }
        }, true);
    if (!map.file)
        delete map.file; // skip optional field `file`
    return map;
}
// browser vs node.js
const b64enc = typeof btoa == 'function' ? btoa : b => Buffer.from(b).toString('base64');
const b64dec = typeof atob == 'function' ? atob : a => Buffer.from(a, 'base64').toString();
function apply_preprocessor_sourcemap(filename, svelte_map, preprocessor_map_input) {
    if (!svelte_map || !preprocessor_map_input)
        return svelte_map;
    const preprocessor_map = typeof preprocessor_map_input === 'string' ? JSON.parse(preprocessor_map_input) : preprocessor_map_input;
    const result_map = combine_sourcemaps(filename, [
        svelte_map,
        preprocessor_map
    ]);
    // Svelte expects a SourceMap which includes toUrl and toString. Instead of wrapping our output in a class,
    // we just tack on the extra properties.
    Object.defineProperties(result_map, {
        toString: {
            enumerable: false,
            value: function toString() {
                return JSON.stringify(this);
            }
        },
        toUrl: {
            enumerable: false,
            value: function toUrl() {
                return 'data:application/json;charset=utf-8;base64,' + b64enc(this.toString());
            }
        }
    });
    return result_map;
}
// parse attached sourcemap in processed.code
function parse_attached_sourcemap(processed, tag_name) {
    const r_in = '[#@]\\s*sourceMappingURL\\s*=\\s*(\\S*)';
    const regex = (tag_name == 'script')
        ? new RegExp('(?://' + r_in + ')|(?:/\\*' + r_in + '\\s*\\*/)$')
        : new RegExp('/\\*' + r_in + '\\s*\\*/$');
    function log_warning(message) {
        // code_start: help to find preprocessor
        const code_start = processed.code.length < 100 ? processed.code : (processed.code.slice(0, 100) + ' [...]');
        console.warn(`warning: ${message}. processed.code = ${JSON.stringify(code_start)}`);
    }
    processed.code = processed.code.replace(regex, (_, match1, match2) => {
        const map_url = (tag_name == 'script') ? (match1 || match2) : match1;
        const map_data = (map_url.match(/data:(?:application|text)\/json;(?:charset[:=]\S+?;)?base64,(\S*)/) || [])[1];
        if (map_data) {
            // sourceMappingURL is data URL
            if (processed.map) {
                log_warning('Not implemented. ' +
                    'Found sourcemap in both processed.code and processed.map. ' +
                    'Please update your preprocessor to return only one sourcemap.');
                // ignore attached sourcemap
                return '';
            }
            processed.map = b64dec(map_data); // use attached sourcemap
            return ''; // remove from processed.code
        }
        // sourceMappingURL is path or URL
        if (!processed.map) {
            log_warning(`Found sourcemap path ${JSON.stringify(map_url)} in processed.code, but no sourcemap data. ` +
                'Please update your preprocessor to return sourcemap data directly.');
        }
        // ignore sourcemap path
        return ''; // remove from processed.code
    });
}

function dom(component, options) {
    const { name } = component;
    const renderer = new Renderer(component, options);
    const { block } = renderer;
    block.has_outro_method = true;
    // prevent fragment being created twice (#1063)
    if (options.customElement)
        block.chunks.create.push(b `this.c = @noop;`);
    const body = [];
    if (renderer.file_var) {
        const file = component.file ? x `"${component.file}"` : x `undefined`;
        body.push(b `const ${renderer.file_var} = ${file};`);
    }
    const css = component.stylesheet.render(options.filename, !options.customElement);
    css.map = apply_preprocessor_sourcemap(options.filename, css.map, options.sourcemap);
    const styles = component.stylesheet.has_styles && options.dev
        ? `${css.code}\n/*# sourceMappingURL=${css.map.toUrl()} */`
        : css.code;
    const add_css = component.get_unique_name('add_css');
    const should_add_css = (!options.customElement &&
        !!styles &&
        options.css !== false);
    if (should_add_css) {
        body.push(b `
			function ${add_css}() {
				var style = @element("style");
				style.id = "${component.stylesheet.id}-style";
				style.textContent = "${styles}";
				@append(@_document.head, style);
			}
		`);
    }
    // fix order
    // TODO the deconflicted names of blocks are reversed... should set them here
    const blocks = renderer.blocks.slice().reverse();
    body.push(...blocks.map(block => {
        // TODO this is a horrible mess — renderer.blocks
        // contains a mixture of Blocks and Nodes
        if (block.render)
            return block.render();
        return block;
    }));
    if (options.dev && !options.hydratable) {
        block.chunks.claim.push(b `throw new @_Error("options.hydrate only works if the component was compiled with the \`hydratable: true\` option");`);
    }
    const uses_slots = component.var_lookup.has('$$slots');
    let compute_slots;
    if (uses_slots) {
        compute_slots = b `
			const $$slots = @compute_slots(#slots);
		`;
    }
    const uses_props = component.var_lookup.has('$$props');
    const uses_rest = component.var_lookup.has('$$restProps');
    const $$props = uses_props || uses_rest ? '$$new_props' : '$$props';
    const props = component.vars.filter(variable => !variable.module && variable.export_name);
    const writable_props = props.filter(variable => variable.writable);
    const omit_props_names = component.get_unique_name('omit_props_names');
    const compute_rest = x `@compute_rest_props($$props, ${omit_props_names.name})`;
    const rest = uses_rest ? b `
		const ${omit_props_names.name} = [${props.map(prop => `"${prop.export_name}"`).join(',')}];
		let $$restProps = ${compute_rest};
	` : null;
    const set = (uses_props || uses_rest || writable_props.length > 0 || component.slots.size > 0)
        ? x `
			${$$props} => {
				${uses_props && renderer.invalidate('$$props', x `$$props = @assign(@assign({}, $$props), @exclude_internal_props($$new_props))`)}
				${uses_rest && !uses_props && x `$$props = @assign(@assign({}, $$props), @exclude_internal_props($$new_props))`}
				${uses_rest && renderer.invalidate('$$restProps', x `$$restProps = ${compute_rest}`)}
				${writable_props.map(prop => b `if ('${prop.export_name}' in ${$$props}) ${renderer.invalidate(prop.name, x `${prop.name} = ${$$props}.${prop.export_name}`)};`)}
				${component.slots.size > 0 &&
            b `if ('$$scope' in ${$$props}) ${renderer.invalidate('$$scope', x `$$scope = ${$$props}.$$scope`)};`}
			}
		`
        : null;
    const accessors = [];
    const not_equal = component.component_options.immutable ? x `@not_equal` : x `@safe_not_equal`;
    let dev_props_check;
    let inject_state;
    let capture_state;
    let props_inject;
    props.forEach(prop => {
        const variable = component.var_lookup.get(prop.name);
        if (!variable.writable || component.component_options.accessors) {
            accessors.push({
                type: 'MethodDefinition',
                kind: 'get',
                key: { type: 'Identifier', name: prop.export_name },
                value: x `function() {
					return ${prop.hoistable ? prop.name : x `this.$$.ctx[${renderer.context_lookup.get(prop.name).index}]`}
				}`
            });
        }
        else if (component.compile_options.dev) {
            accessors.push({
                type: 'MethodDefinition',
                kind: 'get',
                key: { type: 'Identifier', name: prop.export_name },
                value: x `function() {
					throw new @_Error("<${component.tag}>: Props cannot be read directly from the component instance unless compiling with 'accessors: true' or '<svelte:options accessors/>'");
				}`
            });
        }
        if (component.component_options.accessors) {
            if (variable.writable && !renderer.readonly.has(prop.name)) {
                accessors.push({
                    type: 'MethodDefinition',
                    kind: 'set',
                    key: { type: 'Identifier', name: prop.export_name },
                    value: x `function(${prop.name}) {
						this.$set({ ${prop.export_name}: ${prop.name} });
						@flush();
					}`
                });
            }
            else if (component.compile_options.dev) {
                accessors.push({
                    type: 'MethodDefinition',
                    kind: 'set',
                    key: { type: 'Identifier', name: prop.export_name },
                    value: x `function(value) {
						throw new @_Error("<${component.tag}>: Cannot set read-only property '${prop.export_name}'");
					}`
                });
            }
        }
        else if (component.compile_options.dev) {
            accessors.push({
                type: 'MethodDefinition',
                kind: 'set',
                key: { type: 'Identifier', name: prop.export_name },
                value: x `function(value) {
					throw new @_Error("<${component.tag}>: Props cannot be set directly on the component instance unless compiling with 'accessors: true' or '<svelte:options accessors/>'");
				}`
            });
        }
    });
    if (component.compile_options.dev) {
        // checking that expected ones were passed
        const expected = props.filter(prop => prop.writable && !prop.initialised);
        if (expected.length) {
            dev_props_check = b `
				const { ctx: #ctx } = this.$$;
				const props = ${options.customElement ? x `this.attributes` : x `options.props || {}`};
				${expected.map(prop => b `
				if (${renderer.reference(prop.name)} === undefined && !('${prop.export_name}' in props)) {
					@_console.warn("<${component.tag}> was created without expected prop '${prop.export_name}'");
				}`)}
			`;
        }
        const capturable_vars = component.vars.filter(v => !v.internal && !v.global && !v.name.startsWith('$$'));
        if (capturable_vars.length > 0) {
            capture_state = x `() => ({ ${capturable_vars.map(prop => p `${prop.name}`)} })`;
        }
        const injectable_vars = capturable_vars.filter(v => !v.module && v.writable && v.name[0] !== '$');
        if (uses_props || injectable_vars.length > 0) {
            inject_state = x `
				${$$props} => {
					${uses_props && renderer.invalidate('$$props', x `$$props = @assign(@assign({}, $$props), $$new_props)`)}
					${injectable_vars.map(v => b `if ('${v.name}' in $$props) ${renderer.invalidate(v.name, x `${v.name} = ${$$props}.${v.name}`)};`)}
				}
			`;
            props_inject = b `
				if ($$props && "$$inject" in $$props) {
					$$self.$inject_state($$props.$$inject);
				}
			`;
        }
    }
    // instrument assignments
    if (component.ast.instance) {
        let scope = component.instance_scope;
        const map = component.instance_scope_map;
        let execution_context = null;
        walk(component.ast.instance.content, {
            enter(node) {
                if (map.has(node)) {
                    scope = map.get(node);
                    if (!execution_context && !scope.block) {
                        execution_context = node;
                    }
                }
                else if (!execution_context && node.type === 'LabeledStatement' && node.label.name === '$') {
                    execution_context = node;
                }
            },
            leave(node) {
                if (map.has(node)) {
                    scope = scope.parent;
                }
                if (execution_context === node) {
                    execution_context = null;
                }
                if (node.type === 'AssignmentExpression' || node.type === 'UpdateExpression') {
                    const assignee = node.type === 'AssignmentExpression' ? node.left : node.argument;
                    // normally (`a = 1`, `b.c = 2`), there'll be a single name
                    // (a or b). In destructuring cases (`[d, e] = [e, d]`) there
                    // may be more, in which case we need to tack the extra ones
                    // onto the initial function call
                    const names = new Set(extract_names(assignee));
                    this.replace(invalidate(renderer, scope, node, names, execution_context === null));
                }
            }
        });
        component.rewrite_props(({ name, reassigned, export_name }) => {
            const value = `$${name}`;
            const i = renderer.context_lookup.get(`$${name}`).index;
            const insert = (reassigned || export_name)
                ? b `${`$$subscribe_${name}`}()`
                : b `@component_subscribe($$self, ${name}, #value => $$invalidate(${i}, ${value} = #value))`;
            if (component.compile_options.dev) {
                return b `@validate_store(${name}, '${name}'); ${insert}`;
            }
            return insert;
        });
    }
    const args = [x `$$self`];
    const has_invalidate = props.length > 0 ||
        component.has_reactive_assignments ||
        component.slots.size > 0 ||
        capture_state ||
        inject_state;
    if (has_invalidate) {
        args.push(x `$$props`, x `$$invalidate`);
    }
    else if (component.compile_options.dev) {
        // $$props arg is still needed for unknown prop check
        args.push(x `$$props`);
    }
    const has_create_fragment = component.compile_options.dev || block.has_content();
    if (has_create_fragment) {
        body.push(b `
			function create_fragment(#ctx) {
				${block.get_contents()}
			}
		`);
    }
    body.push(b `
		${component.extract_javascript(component.ast.module)}

		${component.fully_hoisted}
	`);
    const filtered_props = props.filter(prop => {
        const variable = component.var_lookup.get(prop.name);
        if (variable.hoistable)
            return false;
        return prop.name[0] !== '$';
    });
    const reactive_stores = component.vars.filter(variable => variable.name[0] === '$' && variable.name[1] !== '$');
    const instance_javascript = component.extract_javascript(component.ast.instance);
    const has_definition = (component.compile_options.dev ||
        (instance_javascript && instance_javascript.length > 0) ||
        filtered_props.length > 0 ||
        uses_props ||
        component.partly_hoisted.length > 0 ||
        renderer.initial_context.length > 0 ||
        component.reactive_declarations.length > 0 ||
        capture_state ||
        inject_state);
    const definition = has_definition
        ? component.alias('instance')
        : { type: 'Literal', value: null };
    const reactive_store_subscriptions = reactive_stores
        .filter(store => {
        const variable = component.var_lookup.get(store.name.slice(1));
        return !variable || variable.hoistable;
    })
        .map(({ name }) => b `
			${component.compile_options.dev && b `@validate_store(${name.slice(1)}, '${name.slice(1)}');`}
			@component_subscribe($$self, ${name.slice(1)}, $$value => $$invalidate(${renderer.context_lookup.get(name).index}, ${name} = $$value));
		`);
    const resubscribable_reactive_store_unsubscribers = reactive_stores
        .filter(store => {
        const variable = component.var_lookup.get(store.name.slice(1));
        return variable && (variable.reassigned || variable.export_name);
    })
        .map(({ name }) => b `$$self.$$.on_destroy.push(() => ${`$$unsubscribe_${name.slice(1)}`}());`);
    if (has_definition) {
        const reactive_declarations = [];
        const fixed_reactive_declarations = []; // not really 'reactive' but whatever
        component.reactive_declarations.forEach(d => {
            const dependencies = Array.from(d.dependencies);
            const uses_rest_or_props = !!dependencies.find(n => n === '$$props' || n === '$$restProps');
            const writable = dependencies.filter(n => {
                const variable = component.var_lookup.get(n);
                return variable && (variable.export_name || variable.mutated || variable.reassigned);
            });
            const condition = !uses_rest_or_props && writable.length > 0 && renderer.dirty(writable, true);
            let statement = d.node; // TODO remove label (use d.node.body) if it's not referenced
            if (condition)
                statement = b `if (${condition}) { ${statement} }`[0];
            if (condition || uses_rest_or_props) {
                reactive_declarations.push(statement);
            }
            else {
                fixed_reactive_declarations.push(statement);
            }
        });
        const injected = Array.from(component.injected_reactive_declaration_vars).filter(name => {
            const variable = component.var_lookup.get(name);
            return variable.injected && variable.name[0] !== '$';
        });
        const reactive_store_declarations = reactive_stores.map(variable => {
            const $name = variable.name;
            const name = $name.slice(1);
            const store = component.var_lookup.get(name);
            if (store && (store.reassigned || store.export_name)) {
                const unsubscribe = `$$unsubscribe_${name}`;
                const subscribe = `$$subscribe_${name}`;
                const i = renderer.context_lookup.get($name).index;
                return b `let ${$name}, ${unsubscribe} = @noop, ${subscribe} = () => (${unsubscribe}(), ${unsubscribe} = @subscribe(${name}, $$value => $$invalidate(${i}, ${$name} = $$value)), ${name})`;
            }
            return b `let ${$name};`;
        });
        let unknown_props_check;
        if (component.compile_options.dev && !(uses_props || uses_rest)) {
            unknown_props_check = b `
				const writable_props = [${writable_props.map(prop => x `'${prop.export_name}'`)}];
				@_Object.keys($$props).forEach(key => {
					if (!~writable_props.indexOf(key) && key.slice(0, 2) !== '$$') @_console.warn(\`<${component.tag}> was created with unknown prop '\${key}'\`);
				});
			`;
        }
        const return_value = {
            type: 'ArrayExpression',
            elements: renderer.initial_context.map(member => ({
                type: 'Identifier',
                name: member.name
            }))
        };
        body.push(b `
			function ${definition}(${args}) {
				${injected.map(name => b `let ${name};`)}

				${rest}

				${reactive_store_declarations}

				${reactive_store_subscriptions}

				${resubscribable_reactive_store_unsubscribers}

				${component.slots.size || component.compile_options.dev || uses_slots ? b `let { $$slots: #slots = {}, $$scope } = $$props;` : null}
				${component.compile_options.dev && b `@validate_slots('${component.tag}', #slots, [${[...component.slots.keys()].map(key => `'${key}'`).join(',')}]);`}
				${compute_slots}

				${instance_javascript}

				${unknown_props_check}

				${renderer.binding_groups.size > 0 && b `const $$binding_groups = [${[...renderer.binding_groups.keys()].map(_ => x `[]`)}];`}

				${component.partly_hoisted}

				${set && b `$$self.$$set = ${set};`}

				${capture_state && b `$$self.$capture_state = ${capture_state};`}

				${inject_state && b `$$self.$inject_state = ${inject_state};`}

				${ /* before reactive declarations */props_inject}

				${reactive_declarations.length > 0 && b `
				$$self.$$.update = () => {
					${reactive_declarations}
				};
				`}

				${fixed_reactive_declarations}

				${uses_props && b `$$props = @exclude_internal_props($$props);`}

				return ${return_value};
			}
		`);
    }
    const prop_indexes = x `{
		${props.filter(v => v.export_name && !v.module).map(v => p `${v.export_name}: ${renderer.context_lookup.get(v.name).index}`)}
	}`;
    let dirty;
    if (renderer.context_overflow) {
        dirty = x `[]`;
        for (let i = 0; i < renderer.context.length; i += 31) {
            dirty.elements.push(x `-1`);
        }
    }
    if (options.customElement) {
        let init_props = x `@attribute_to_object(this.attributes)`;
        if (uses_slots) {
            init_props = x `{ ...${init_props}, $$slots: @get_custom_elements_slots(this) }`;
        }
        const declaration = b `
			class ${name} extends @SvelteElement {
				constructor(options) {
					super();

					${css.code && b `this.shadowRoot.innerHTML = \`<style>${css.code.replace(/\\/g, '\\\\')}${options.dev ? `\n/*# sourceMappingURL=${css.map.toUrl()} */` : ''}</style>\`;`}

					@init(this, { target: this.shadowRoot, props: ${init_props}, customElement: true }, ${definition}, ${has_create_fragment ? 'create_fragment' : 'null'}, ${not_equal}, ${prop_indexes}, ${dirty});

					${dev_props_check}

					if (options) {
						if (options.target) {
							@insert(options.target, this, options.anchor);
						}

						${(props.length > 0 || uses_props || uses_rest) && b `
						if (options.props) {
							this.$set(options.props);
							@flush();
						}`}
					}
				}
			}
		`[0];
        if (props.length > 0) {
            declaration.body.body.push({
                type: 'MethodDefinition',
                kind: 'get',
                static: true,
                computed: false,
                key: { type: 'Identifier', name: 'observedAttributes' },
                value: x `function() {
					return [${props.map(prop => x `"${prop.export_name}"`)}];
				}`
            });
        }
        declaration.body.body.push(...accessors);
        body.push(declaration);
        if (component.tag != null) {
            body.push(b `
				@_customElements.define("${component.tag}", ${name});
			`);
        }
    }
    else {
        const superclass = {
            type: 'Identifier',
            name: options.dev ? '@SvelteComponentDev' : '@SvelteComponent'
        };
        const declaration = b `
			class ${name} extends ${superclass} {
				constructor(options) {
					super(${options.dev && 'options'});
					${should_add_css && b `if (!@_document.getElementById("${component.stylesheet.id}-style")) ${add_css}();`}
					@init(this, options, ${definition}, ${has_create_fragment ? 'create_fragment' : 'null'}, ${not_equal}, ${prop_indexes}, ${dirty});
					${options.dev && b `@dispatch_dev("SvelteRegisterComponent", { component: this, tagName: "${name.name}", options, id: create_fragment.name });`}

					${dev_props_check}
				}
			}
		`[0];
        declaration.body.body.push(...accessors);
        body.push(declaration);
    }
    return { js: flatten$1(body, []), css };
}
function flatten$1(nodes, target) {
    for (let i = 0; i < nodes.length; i += 1) {
        const node = nodes[i];
        if (Array.isArray(node)) {
            flatten$1(node, target);
        }
        else {
            target.push(node);
        }
    }
    return target;
}

function AwaitBlock (node, renderer, options) {
    renderer.push();
    renderer.render(node.pending.children, options);
    const pending = renderer.pop();
    renderer.push();
    renderer.render(node.then.children, options);
    const then = renderer.pop();
    renderer.add_expression(x `
		function(__value) {
			if (@is_promise(__value)) return ${pending};
			return (function(${node.then_node ? node.then_node : ''}) { return ${then}; }(__value));
		}(${node.expression.node})
	`);
}

function Comment$1 (_node, _renderer, _options) {
    // TODO preserve comments
    // if (options.preserveComments) {
    // 	renderer.append(`<!--${node.data}-->`);
    // }
}

function DebugTag (node, renderer, options) {
    if (!options.dev)
        return;
    const filename = options.filename || null;
    const { line, column } = options.locate(node.start + 1);
    const obj = x `{
		${node.expressions.map(e => p `${e.node.name}`)}
	}`;
    renderer.add_expression(x `@debug(${filename ? x `"${filename}"` : x `null`}, ${line - 1}, ${column}, ${obj})`);
}

function EachBlock (node, renderer, options) {
    const args = [node.context_node];
    if (node.index)
        args.push({ type: 'Identifier', name: node.index });
    renderer.push();
    renderer.render(node.children, options);
    const result = renderer.pop();
    const consequent = x `@each(${node.expression.node}, (${args}) => ${result})`;
    if (node.else) {
        renderer.push();
        renderer.render(node.else.children, options);
        const alternate = renderer.pop();
        renderer.add_expression(x `${node.expression.node}.length ? ${consequent} : ${alternate}`);
    }
    else {
        renderer.add_expression(consequent);
    }
}

function get_class_attribute_value(attribute) {
    // handle special case — `class={possiblyUndefined}` with scoped CSS
    if (attribute.chunks.length === 2 && attribute.chunks[1].synthetic) {
        const value = attribute.chunks[0].node;
        return x `@escape(@null_to_empty(${value})) + "${attribute.chunks[1].data}"`;
    }
    return get_attribute_value(attribute);
}
function get_attribute_value(attribute) {
    if (attribute.chunks.length === 0)
        return x `""`;
    return attribute.chunks
        .map((chunk) => {
        return chunk.type === 'Text'
            ? string_literal(chunk.data.replace(/"/g, '&quot;'))
            : x `@escape(${chunk.node})`;
    })
        .reduce((lhs, rhs) => x `${lhs} + ${rhs}`);
}

// source: https://html.spec.whatwg.org/multipage/indices.html
const boolean_attributes = new Set([
    'allowfullscreen',
    'allowpaymentrequest',
    'async',
    'autofocus',
    'autoplay',
    'checked',
    'controls',
    'default',
    'defer',
    'disabled',
    'formnovalidate',
    'hidden',
    'ismap',
    'loop',
    'multiple',
    'muted',
    'nomodule',
    'novalidate',
    'open',
    'playsinline',
    'readonly',
    'required',
    'reversed',
    'selected'
]);

// similar logic from `compile/render_dom/wrappers/Fragment`
// We want to remove trailing whitespace inside an element/component/block,
// *unless* there is no whitespace between this node and its next sibling
function remove_whitespace_children(children, next) {
    const nodes = [];
    let last_child;
    let i = children.length;
    while (i--) {
        const child = children[i];
        if (child.type === 'Text') {
            if (child.should_skip()) {
                continue;
            }
            let { data } = child;
            if (nodes.length === 0) {
                const should_trim = next
                    ? next.type === 'Text' &&
                        /^\s/.test(next.data) &&
                        trimmable_at$1(child, next)
                    : !child.has_ancestor('EachBlock');
                if (should_trim) {
                    data = trim_end(data);
                    if (!data)
                        continue;
                }
            }
            // glue text nodes (which could e.g. be separated by comments) together
            if (last_child && last_child.type === 'Text') {
                last_child.data = data + last_child.data;
                continue;
            }
            nodes.unshift(child);
            link(last_child, last_child = child);
        }
        else {
            nodes.unshift(child);
            link(last_child, last_child = child);
        }
    }
    const first = nodes[0];
    if (first && first.type === 'Text') {
        first.data = trim_start(first.data);
        if (!first.data) {
            first.var = null;
            nodes.shift();
            if (nodes[0]) {
                nodes[0].prev = null;
            }
        }
    }
    return nodes;
}
function trimmable_at$1(child, next_sibling) {
    // Whitespace is trimmable if one of the following is true:
    // The child and its sibling share a common nearest each block (not at an each block boundary)
    // The next sibling's previous node is an each block
    return (next_sibling.find_nearest(/EachBlock/) ===
        child.find_nearest(/EachBlock/) || next_sibling.prev.type === 'EachBlock');
}

function Element (node, renderer, options) {
    const children = remove_whitespace_children(node.children, node.next);
    // awkward special case
    let node_contents;
    const contenteditable = (node.name !== 'textarea' &&
        node.name !== 'input' &&
        node.attributes.some((attribute) => attribute.name === 'contenteditable'));
    renderer.add_string(`<${node.name}`);
    const class_expression_list = node.classes.map(class_directive => {
        const { expression, name } = class_directive;
        const snippet = expression ? expression.node : x `#ctx.${name}`; // TODO is this right?
        return x `${snippet} ? "${name}" : ""`;
    });
    if (node.needs_manual_style_scoping) {
        class_expression_list.push(x `"${node.component.stylesheet.id}"`);
    }
    const class_expression = class_expression_list.length > 0 &&
        class_expression_list.reduce((lhs, rhs) => x `${lhs} + ' ' + ${rhs}`);
    if (node.attributes.some(attr => attr.is_spread)) {
        // TODO dry this out
        const args = [];
        node.attributes.forEach(attribute => {
            if (attribute.is_spread) {
                args.push(attribute.expression.node);
            }
            else {
                const name = attribute.name.toLowerCase();
                if (name === 'value' && node.name.toLowerCase() === 'textarea') {
                    node_contents = get_attribute_value(attribute);
                }
                else if (attribute.is_true) {
                    args.push(x `{ ${attribute.name}: true }`);
                }
                else if (boolean_attributes.has(name) &&
                    attribute.chunks.length === 1 &&
                    attribute.chunks[0].type !== 'Text') {
                    // a boolean attribute with one non-Text chunk
                    args.push(x `{ ${attribute.name}: ${attribute.chunks[0].node} || null }`);
                }
                else {
                    args.push(x `{ ${attribute.name}: ${get_attribute_value(attribute)} }`);
                }
            }
        });
        renderer.add_expression(x `@spread([${args}], ${class_expression})`);
    }
    else {
        let add_class_attribute = !!class_expression;
        node.attributes.forEach(attribute => {
            const name = attribute.name.toLowerCase();
            if (name === 'value' && node.name.toLowerCase() === 'textarea') {
                node_contents = get_attribute_value(attribute);
            }
            else if (attribute.is_true) {
                renderer.add_string(` ${attribute.name}`);
            }
            else if (boolean_attributes.has(name) &&
                attribute.chunks.length === 1 &&
                attribute.chunks[0].type !== 'Text') {
                // a boolean attribute with one non-Text chunk
                renderer.add_string(' ');
                renderer.add_expression(x `${attribute.chunks[0].node} ? "${attribute.name}" : ""`);
            }
            else if (name === 'class' && class_expression) {
                add_class_attribute = false;
                renderer.add_string(` ${attribute.name}="`);
                renderer.add_expression(x `[${get_class_attribute_value(attribute)}, ${class_expression}].join(' ').trim()`);
                renderer.add_string('"');
            }
            else if (attribute.chunks.length === 1 && attribute.chunks[0].type !== 'Text') {
                const snippet = attribute.chunks[0].node;
                renderer.add_expression(x `@add_attribute("${attribute.name}", ${snippet}, ${boolean_attributes.has(name) ? 1 : 0})`);
            }
            else {
                renderer.add_string(` ${attribute.name}="`);
                renderer.add_expression((name === 'class' ? get_class_attribute_value : get_attribute_value)(attribute));
                renderer.add_string('"');
            }
        });
        if (add_class_attribute) {
            renderer.add_expression(x `@add_classes([${class_expression}].join(' ').trim())`);
        }
    }
    node.bindings.forEach(binding => {
        const { name, expression } = binding;
        if (binding.is_readonly) {
            return;
        }
        if (name === 'group') ;
        else if (contenteditable && (name === 'textContent' || name === 'innerHTML')) {
            node_contents = expression.node;
            // TODO where was this used?
            // value = name === 'textContent' ? x`@escape($$value)` : x`$$value`;
        }
        else if (binding.name === 'value' && node.name === 'textarea') {
            const snippet = expression.node;
            node_contents = x `${snippet} || ""`;
        }
        else {
            const snippet = expression.node;
            renderer.add_expression(x `@add_attribute("${name}", ${snippet}, 1)`);
        }
    });
    if (options.hydratable && options.head_id) {
        renderer.add_string(` data-svelte="${options.head_id}"`);
    }
    renderer.add_string('>');
    if (node_contents !== undefined) {
        if (contenteditable) {
            renderer.push();
            renderer.render(children, options);
            const result = renderer.pop();
            renderer.add_expression(x `($$value => $$value === void 0 ? ${result} : $$value)(${node_contents})`);
        }
        else {
            renderer.add_expression(node_contents);
        }
        if (!is_void(node.name)) {
            renderer.add_string(`</${node.name}>`);
        }
    }
    else {
        renderer.render(children, options);
        if (!is_void(node.name)) {
            renderer.add_string(`</${node.name}>`);
        }
    }
}

function Head (node, renderer, options) {
    const head_options = Object.assign(Object.assign({}, options), { head_id: node.id });
    renderer.push();
    renderer.render(node.children, head_options);
    const result = renderer.pop();
    renderer.add_expression(x `$$result.head += ${result}, ""`);
}

function HtmlTag (node, renderer, _options) {
    renderer.add_expression(node.expression.node);
}

function IfBlock (node, renderer, options) {
    const condition = node.expression.node;
    renderer.push();
    renderer.render(node.children, options);
    const consequent = renderer.pop();
    renderer.push();
    if (node.else)
        renderer.render(node.else.children, options);
    const alternate = renderer.pop();
    renderer.add_expression(x `${condition} ? ${consequent} : ${alternate}`);
}

function get_prop_value(attribute) {
    if (attribute.is_true)
        return x `true`;
    if (attribute.chunks.length === 0)
        return x `''`;
    return attribute.chunks
        .map(chunk => {
        if (chunk.type === 'Text')
            return string_literal(chunk.data);
        return chunk.node;
    })
        .reduce((lhs, rhs) => x `${lhs} + ${rhs}`);
}
function InlineComponent (node, renderer, options) {
    const binding_props = [];
    const binding_fns = [];
    node.bindings.forEach(binding => {
        renderer.has_bindings = true;
        // TODO this probably won't work for contextual bindings
        const snippet = binding.expression.node;
        binding_props.push(p `${binding.name}: ${snippet}`);
        binding_fns.push(p `${binding.name}: $$value => { ${snippet} = $$value; $$settled = false }`);
    });
    const uses_spread = node.attributes.find(attr => attr.is_spread);
    let props;
    if (uses_spread) {
        props = x `@_Object.assign(${node.attributes
            .map(attribute => {
            if (attribute.is_spread) {
                return attribute.expression.node;
            }
            else {
                return x `{ ${attribute.name}: ${get_prop_value(attribute)} }`;
            }
        })
            .concat(binding_props.map(p => x `{ ${p} }`))})`;
    }
    else {
        props = x `{
			${node.attributes.map(attribute => p `${attribute.name}: ${get_prop_value(attribute)}`)},
			${binding_props}
		}`;
    }
    const bindings = x `{
		${binding_fns}
	}`;
    const expression = (node.name === 'svelte:self'
        ? renderer.name
        : node.name === 'svelte:component'
            ? x `(${node.expression.node}) || @missing_component`
            : node.name.split('.').reduce(((lhs, rhs) => x `${lhs}.${rhs}`)));
    const slot_fns = [];
    const children = node.children;
    if (children.length) {
        const slot_scopes = new Map();
        renderer.render(children, Object.assign({}, options, {
            slot_scopes
        }));
        slot_scopes.forEach(({ input, output }, name) => {
            slot_fns.push(p `${name}: (${input}) => ${output}`);
        });
    }
    const slots = x `{
		${slot_fns}
	}`;
    renderer.add_expression(x `@validate_component(${expression}, "${node.name}").$$render($$result, ${props}, ${bindings}, ${slots})`);
}

function KeyBlock (node, renderer, options) {
    renderer.render(node.children, options);
}

function get_slot_scope(lets) {
    if (lets.length === 0)
        return null;
    return {
        type: 'ObjectPattern',
        properties: lets.map(l => {
            return {
                type: 'Property',
                kind: 'init',
                method: false,
                shorthand: false,
                computed: false,
                key: l.name,
                value: l.value || l.name
            };
        })
    };
}

function Slot (node, renderer, options) {
    const slot_data = get_slot_data(node.values);
    const slot = node.get_static_attribute_value('slot');
    const nearest_inline_component = node.find_nearest(/InlineComponent/);
    if (slot && nearest_inline_component) {
        renderer.push();
    }
    renderer.push();
    renderer.render(node.children, options);
    const result = renderer.pop();
    renderer.add_expression(x `
		#slots.${node.slot_name}
			? #slots.${node.slot_name}(${slot_data})
			: ${result}
	`);
    if (slot && nearest_inline_component) {
        const lets = node.lets;
        const seen = new Set(lets.map(l => l.name.name));
        nearest_inline_component.lets.forEach(l => {
            if (!seen.has(l.name.name))
                lets.push(l);
        });
        options.slot_scopes.set(slot, {
            input: get_slot_scope(node.lets),
            output: renderer.pop()
        });
    }
}

class AbstractBlock extends Node$1 {
    constructor(component, parent, scope, info) {
        super(component, parent, scope, info);
    }
    warn_if_empty_block() {
        if (!this.children || this.children.length > 1)
            return;
        const child = this.children[0];
        if (!child || (child.type === 'Text' && !/[^ \r\n\f\v\t]/.test(child.data))) {
            this.component.warn(this, {
                code: 'empty-block',
                message: 'Empty block'
            });
        }
    }
}

class PendingBlock extends AbstractBlock {
    constructor(component, parent, scope, info) {
        super(component, parent, scope, info);
        this.children = map_children(component, parent, scope, info.children);
        if (!info.skip) {
            this.warn_if_empty_block();
        }
    }
}

class ThenBlock extends AbstractBlock {
    constructor(component, parent, scope, info) {
        super(component, parent, scope, info);
        this.scope = scope.child();
        if (parent.then_node) {
            parent.then_contexts.forEach(context => {
                this.scope.add(context.key.name, parent.expression.dependencies, this);
            });
        }
        this.children = map_children(component, parent, this.scope, info.children);
        if (!info.skip) {
            this.warn_if_empty_block();
        }
    }
}

class CatchBlock extends AbstractBlock {
    constructor(component, parent, scope, info) {
        super(component, parent, scope, info);
        this.scope = scope.child();
        if (parent.catch_node) {
            parent.catch_contexts.forEach(context => {
                this.scope.add(context.key.name, parent.expression.dependencies, this);
            });
        }
        this.children = map_children(component, parent, this.scope, info.children);
        if (!info.skip) {
            this.warn_if_empty_block();
        }
    }
}

function unpack_destructuring(contexts, node, modifier = node => node, default_modifier = node => node) {
    if (!node)
        return;
    if (node.type === 'Identifier') {
        contexts.push({
            key: node,
            modifier,
            default_modifier
        });
    }
    else if (node.type === 'RestElement') {
        contexts.push({
            key: node.argument,
            modifier,
            default_modifier
        });
    }
    else if (node.type === 'ArrayPattern') {
        node.elements.forEach((element, i) => {
            if (element && element.type === 'RestElement') {
                unpack_destructuring(contexts, element, node => x `${modifier(node)}.slice(${i})`, default_modifier);
            }
            else if (element && element.type === 'AssignmentPattern') {
                const n = contexts.length;
                unpack_destructuring(contexts, element.left, node => x `${modifier(node)}[${i}]`, (node, to_ctx) => x `${node} !== undefined ? ${node} : ${update_reference(contexts, n, element.right, to_ctx)}`);
            }
            else {
                unpack_destructuring(contexts, element, node => x `${modifier(node)}[${i}]`, default_modifier);
            }
        });
    }
    else if (node.type === 'ObjectPattern') {
        const used_properties = [];
        node.properties.forEach((property) => {
            if (property.type === 'RestElement') {
                unpack_destructuring(contexts, property.argument, node => x `@object_without_properties(${modifier(node)}, [${used_properties}])`, default_modifier);
            }
            else {
                const key = property.key;
                const value = property.value;
                used_properties.push(x `"${key.name}"`);
                if (value.type === 'AssignmentPattern') {
                    const n = contexts.length;
                    unpack_destructuring(contexts, value.left, node => x `${modifier(node)}.${key.name}`, (node, to_ctx) => x `${node} !== undefined ? ${node} : ${update_reference(contexts, n, value.right, to_ctx)}`);
                }
                else {
                    unpack_destructuring(contexts, value, node => x `${modifier(node)}.${key.name}`, default_modifier);
                }
            }
        });
    }
}
function update_reference(contexts, n, expression, to_ctx) {
    const find_from_context = (node) => {
        for (let i = n; i < contexts.length; i++) {
            const { key } = contexts[i];
            if (node.name === key.name) {
                throw new Error(`Cannot access '${node.name}' before initialization`);
            }
        }
        return to_ctx(node.name);
    };
    if (expression.type === 'Identifier') {
        return find_from_context(expression);
    }
    // NOTE: avoid unnecessary deep clone?
    expression = JSON.parse(JSON.stringify(expression));
    walk(expression, {
        enter(node, parent) {
            if (isReference(node, parent)) {
                this.replace(find_from_context(node));
                this.skip();
            }
        }
    });
    return expression;
}

class AwaitBlock$1 extends Node$1 {
    constructor(component, parent, scope, info) {
        super(component, parent, scope, info);
        this.expression = new Expression(component, this, scope, info.expression);
        this.then_node = info.value;
        this.catch_node = info.error;
        if (this.then_node) {
            this.then_contexts = [];
            unpack_destructuring(this.then_contexts, info.value);
        }
        if (this.catch_node) {
            this.catch_contexts = [];
            unpack_destructuring(this.catch_contexts, info.error);
        }
        this.pending = new PendingBlock(component, this, scope, info.pending);
        this.then = new ThenBlock(component, this, scope, info.then);
        this.catch = new CatchBlock(component, this, scope, info.catch);
    }
}

class EventHandler extends Node$1 {
    constructor(component, parent, template_scope, info) {
        super(component, parent, template_scope, info);
        this.uses_context = false;
        this.can_make_passive = false;
        this.name = info.name;
        this.modifiers = new Set(info.modifiers);
        if (info.expression) {
            this.expression = new Expression(component, this, template_scope, info.expression);
            this.uses_context = this.expression.uses_context;
            if (/FunctionExpression/.test(info.expression.type) && info.expression.params.length === 0) {
                // TODO make this detection more accurate — if `event.preventDefault` isn't called, and
                // `event` is passed to another function, we can make it passive
                this.can_make_passive = true;
            }
            else if (info.expression.type === 'Identifier') {
                let node = component.node_for_declaration.get(info.expression.name);
                if (node) {
                    if (node.type === 'VariableDeclaration') {
                        // for `const handleClick = () => {...}`, we want the [arrow] function expression node
                        const declarator = node.declarations.find(d => d.id.name === info.expression.name);
                        node = declarator && declarator.init;
                    }
                    if (node && (node.type === 'FunctionExpression' || node.type === 'FunctionDeclaration' || node.type === 'ArrowFunctionExpression') && node.params.length === 0) {
                        this.can_make_passive = true;
                    }
                }
            }
        }
        else {
            this.handler_name = component.get_unique_name(`${sanitize(this.name)}_handler`);
        }
    }
    get reassigned() {
        if (!this.expression) {
            return false;
        }
        const node = this.expression.node;
        if (/FunctionExpression/.test(node.type)) {
            return false;
        }
        return this.expression.dynamic_dependencies().length > 0;
    }
}

class Body extends Node$1 {
    constructor(component, parent, scope, info) {
        super(component, parent, scope, info);
        this.handlers = [];
        info.attributes.forEach((node) => {
            if (node.type === 'EventHandler') {
                this.handlers.push(new EventHandler(component, this, scope, node));
            }
        });
    }
}

const pattern = /^\s*svelte-ignore\s+([\s\S]+)\s*$/m;
class Comment$2 extends Node$1 {
    constructor(component, parent, scope, info) {
        super(component, parent, scope, info);
        this.data = info.data;
        const match = pattern.exec(this.data);
        this.ignores = match ? match[1].split(/[^\S]/).map(x => x.trim()).filter(Boolean) : [];
    }
}

class ElseBlock extends AbstractBlock {
    constructor(component, parent, scope, info) {
        super(component, parent, scope, info);
        this.children = map_children(component, this, scope, info.children);
        this.warn_if_empty_block();
    }
}

class EachBlock$1 extends AbstractBlock {
    constructor(component, parent, scope, info) {
        super(component, parent, scope, info);
        this.has_binding = false;
        this.has_index_binding = false;
        this.expression = new Expression(component, this, scope, info.expression);
        this.context = info.context.name || 'each'; // TODO this is used to facilitate binding; currently fails with destructuring
        this.context_node = info.context;
        this.index = info.index;
        this.scope = scope.child();
        this.contexts = [];
        unpack_destructuring(this.contexts, info.context);
        this.contexts.forEach(context => {
            this.scope.add(context.key.name, this.expression.dependencies, this);
        });
        if (this.index) {
            // index can only change if this is a keyed each block
            const dependencies = info.key ? this.expression.dependencies : new Set([]);
            this.scope.add(this.index, dependencies, this);
        }
        this.key = info.key
            ? new Expression(component, this, this.scope, info.key)
            : null;
        this.has_animation = false;
        this.children = map_children(component, this, this.scope, info.children);
        if (this.has_animation) {
            if (this.children.length !== 1) {
                const child = this.children.find(child => !!child.animation);
                component.error(child.animation, {
                    code: 'invalid-animation',
                    message: 'An element that uses the animate directive must be the sole child of a keyed each block'
                });
            }
        }
        this.warn_if_empty_block();
        this.else = info.else
            ? new ElseBlock(component, this, this.scope, info.else)
            : null;
    }
}

class Attribute extends Node$1 {
    constructor(component, parent, scope, info) {
        super(component, parent, scope, info);
        this.scope = scope;
        if (info.type === 'Spread') {
            this.name = null;
            this.is_spread = true;
            this.is_true = false;
            this.expression = new Expression(component, this, scope, info.expression);
            this.dependencies = this.expression.dependencies;
            this.chunks = null;
            this.is_static = false;
        }
        else {
            this.name = info.name;
            this.is_true = info.value === true;
            this.is_static = true;
            this.dependencies = new Set();
            this.chunks = this.is_true
                ? []
                : info.value.map(node => {
                    if (node.type === 'Text')
                        return node;
                    this.is_static = false;
                    const expression = new Expression(component, this, scope, node.expression);
                    add_to_set(this.dependencies, expression.dependencies);
                    return expression;
                });
        }
    }
    get_dependencies() {
        if (this.is_spread)
            return this.expression.dynamic_dependencies();
        const dependencies = new Set();
        this.chunks.forEach(chunk => {
            if (chunk.type === 'Expression') {
                add_to_set(dependencies, chunk.dynamic_dependencies());
            }
        });
        return Array.from(dependencies);
    }
    get_value(block) {
        if (this.is_true)
            return x `true`;
        if (this.chunks.length === 0)
            return x `""`;
        if (this.chunks.length === 1) {
            return this.chunks[0].type === 'Text'
                ? string_literal(this.chunks[0].data)
                : this.chunks[0].manipulate(block);
        }
        let expression = this.chunks
            .map(chunk => chunk.type === 'Text' ? string_literal(chunk.data) : chunk.manipulate(block))
            .reduce((lhs, rhs) => x `${lhs} + ${rhs}`);
        if (this.chunks[0].type !== 'Text') {
            expression = x `"" + ${expression}`;
        }
        return expression;
    }
    get_static_value() {
        if (this.is_spread || this.dependencies.size > 0)
            return null;
        return this.is_true
            ? true
            : this.chunks[0]
                // method should be called only when `is_static = true`
                ? this.chunks[0].data
                : '';
    }
    should_cache() {
        return this.is_static
            ? false
            : this.chunks.length === 1
                // @ts-ignore todo: probably error
                ? this.chunks[0].node.type !== 'Identifier' || this.scope.names.has(this.chunks[0].node.name)
                : true;
    }
}

// TODO this should live in a specific binding
const read_only_media_attributes = new Set([
    'duration',
    'buffered',
    'seekable',
    'played',
    'seeking',
    'ended',
    'videoHeight',
    'videoWidth'
]);
class Binding extends Node$1 {
    constructor(component, parent, scope, info) {
        super(component, parent, scope, info);
        if (info.expression.type !== 'Identifier' && info.expression.type !== 'MemberExpression') {
            component.error(info, {
                code: 'invalid-directive-value',
                message: 'Can only bind to an identifier (e.g. `foo`) or a member expression (e.g. `foo.bar` or `foo[baz]`)'
            });
        }
        this.name = info.name;
        this.expression = new Expression(component, this, scope, info.expression);
        this.raw_expression = JSON.parse(JSON.stringify(info.expression));
        const { name } = get_object(this.expression.node);
        this.is_contextual = Array.from(this.expression.references).some(name => scope.names.has(name));
        // make sure we track this as a mutable ref
        if (scope.is_let(name)) {
            component.error(this, {
                code: 'invalid-binding',
                message: 'Cannot bind to a variable declared with the let: directive'
            });
        }
        else if (scope.names.has(name)) {
            if (scope.is_await(name)) {
                component.error(this, {
                    code: 'invalid-binding',
                    message: 'Cannot bind to a variable declared with {#await ... then} or {:catch} blocks'
                });
            }
            scope.dependencies_for_name.get(name).forEach(name => {
                const variable = component.var_lookup.get(name);
                if (variable) {
                    variable.mutated = true;
                }
            });
        }
        else {
            const variable = component.var_lookup.get(name);
            if (!variable || variable.global) {
                component.error(this.expression.node, {
                    code: 'binding-undeclared',
                    message: `${name} is not declared`
                });
            }
            variable[this.expression.node.type === 'MemberExpression' ? 'mutated' : 'reassigned'] = true;
            if (info.expression.type === 'Identifier' && !variable.writable) {
                component.error(this.expression.node, {
                    code: 'invalid-binding',
                    message: 'Cannot bind to a variable which is not writable'
                });
            }
        }
        const type = parent.get_static_attribute_value('type');
        this.is_readonly =
            dimensions.test(this.name) ||
                (isElement(parent) &&
                    ((parent.is_media_node() && read_only_media_attributes.has(this.name)) ||
                        (parent.name === 'input' && type === 'file')) /* TODO others? */);
    }
    is_readonly_media_attribute() {
        return read_only_media_attributes.has(this.name);
    }
}
function isElement(node) {
    return !!node.is_media_node;
}

class Transition extends Node$1 {
    constructor(component, parent, scope, info) {
        super(component, parent, scope, info);
        component.warn_if_undefined(info.name, info, scope);
        this.name = info.name;
        component.add_reference(info.name.split('.')[0]);
        this.directive = info.intro && info.outro ? 'transition' : info.intro ? 'in' : 'out';
        this.is_local = info.modifiers.includes('local');
        if ((info.intro && parent.intro) || (info.outro && parent.outro)) {
            const parent_transition = (parent.intro || parent.outro);
            const message = this.directive === parent_transition.directive
                ? `An element can only have one '${this.directive}' directive`
                : `An element cannot have both ${describe(parent_transition)} directive and ${describe(this)} directive`;
            component.error(info, {
                code: 'duplicate-transition',
                message
            });
        }
        this.expression = info.expression
            ? new Expression(component, this, scope, info.expression)
            : null;
    }
}
function describe(transition) {
    return transition.directive === 'transition'
        ? "a 'transition'"
        : `an '${transition.directive}'`;
}

class Animation extends Node$1 {
    constructor(component, parent, scope, info) {
        super(component, parent, scope, info);
        component.warn_if_undefined(info.name, info, scope);
        this.name = info.name;
        component.add_reference(info.name.split('.')[0]);
        if (parent.animation) {
            component.error(this, {
                code: 'duplicate-animation',
                message: "An element can only have one 'animate' directive"
            });
        }
        const block = parent.parent;
        if (!block || block.type !== 'EachBlock' || !block.key) {
            // TODO can we relax the 'immediate child' rule?
            component.error(this, {
                code: 'invalid-animation',
                message: 'An element that uses the animate directive must be the immediate child of a keyed each block'
            });
        }
        block.has_animation = true;
        this.expression = info.expression
            ? new Expression(component, this, scope, info.expression, true)
            : null;
    }
}

class Class extends Node$1 {
    constructor(component, parent, scope, info) {
        super(component, parent, scope, info);
        this.name = info.name;
        this.expression = info.expression
            ? new Expression(component, this, scope, info.expression)
            : null;
    }
}

// Whitespace inside one of these elements will not result in
// a whitespace node being created in any circumstances. (This
// list is almost certainly very incomplete)
const elements_without_text = new Set([
    'audio',
    'datalist',
    'dl',
    'optgroup',
    'select',
    'video'
]);
class Text extends Node$1 {
    constructor(component, parent, scope, info) {
        super(component, parent, scope, info);
        this.data = info.data;
        this.synthetic = info.synthetic || false;
    }
    should_skip() {
        if (/\S/.test(this.data))
            return false;
        const parent_element = this.find_nearest(/(?:Element|InlineComponent|SlotTemplate|Head)/);
        if (!parent_element)
            return false;
        if (parent_element.type === 'Head')
            return true;
        if (parent_element.type === 'InlineComponent')
            return parent_element.children.length === 1 && this === parent_element.children[0];
        // svg namespace exclusions
        if (/svg$/.test(parent_element.namespace)) {
            if (this.prev && this.prev.type === 'Element' && this.prev.name === 'tspan')
                return false;
        }
        return parent_element.namespace || elements_without_text.has(parent_element.name);
    }
}

const applicable = new Set(['Identifier', 'ObjectExpression', 'ArrayExpression', 'Property']);
class Let extends Node$1 {
    constructor(component, parent, scope, info) {
        super(component, parent, scope, info);
        this.names = [];
        this.name = { type: 'Identifier', name: info.name };
        const { names } = this;
        if (info.expression) {
            this.value = info.expression;
            walk(info.expression, {
                enter(node) {
                    if (!applicable.has(node.type)) {
                        component.error(node, {
                            code: 'invalid-let',
                            message: 'let directive value must be an identifier or an object/array pattern'
                        });
                    }
                    if (node.type === 'Identifier') {
                        names.push(node.name);
                    }
                    // slightly unfortunate hack
                    if (node.type === 'ArrayExpression') {
                        node.type = 'ArrayPattern';
                    }
                    if (node.type === 'ObjectExpression') {
                        node.type = 'ObjectPattern';
                    }
                }
            });
        }
        else {
            names.push(this.name.name);
        }
    }
}

const svg$1 = /^(?:altGlyph|altGlyphDef|altGlyphItem|animate|animateColor|animateMotion|animateTransform|circle|clipPath|color-profile|cursor|defs|desc|discard|ellipse|feBlend|feColorMatrix|feComponentTransfer|feComposite|feConvolveMatrix|feDiffuseLighting|feDisplacementMap|feDistantLight|feDropShadow|feFlood|feFuncA|feFuncB|feFuncG|feFuncR|feGaussianBlur|feImage|feMerge|feMergeNode|feMorphology|feOffset|fePointLight|feSpecularLighting|feSpotLight|feTile|feTurbulence|filter|font|font-face|font-face-format|font-face-name|font-face-src|font-face-uri|foreignObject|g|glyph|glyphRef|hatch|hatchpath|hkern|image|line|linearGradient|marker|mask|mesh|meshgradient|meshpatch|meshrow|metadata|missing-glyph|mpath|path|pattern|polygon|polyline|radialGradient|rect|set|solidcolor|stop|svg|switch|symbol|text|textPath|tref|tspan|unknown|use|view|vkern)$/;
const aria_attributes = 'activedescendant atomic autocomplete busy checked colcount colindex colspan controls current describedby details disabled dropeffect errormessage expanded flowto grabbed haspopup hidden invalid keyshortcuts label labelledby level live modal multiline multiselectable orientation owns placeholder posinset pressed readonly relevant required roledescription rowcount rowindex rowspan selected setsize sort valuemax valuemin valuenow valuetext'.split(' ');
const aria_attribute_set = new Set(aria_attributes);
const aria_roles = 'alert alertdialog application article banner blockquote button caption cell checkbox code columnheader combobox complementary contentinfo definition deletion dialog directory document emphasis feed figure form generic graphics-document graphics-object graphics-symbol grid gridcell group heading img link list listbox listitem log main marquee math meter menu menubar menuitem menuitemcheckbox menuitemradio navigation none note option paragraph presentation progressbar radio radiogroup region row rowgroup rowheader scrollbar search searchbox separator slider spinbutton status strong subscript superscript switch tab table tablist tabpanel term textbox time timer toolbar tooltip tree treegrid treeitem'.split(' ');
const aria_role_set = new Set(aria_roles);
const a11y_required_attributes = {
    a: ['href'],
    area: ['alt', 'aria-label', 'aria-labelledby'],
    // html-has-lang
    html: ['lang'],
    // iframe-has-title
    iframe: ['title'],
    img: ['alt'],
    object: ['title', 'aria-label', 'aria-labelledby']
};
const a11y_distracting_elements = new Set([
    'blink',
    'marquee'
]);
const a11y_required_content = new Set([
    // anchor-has-content
    'a',
    // heading-has-content
    'h1',
    'h2',
    'h3',
    'h4',
    'h5',
    'h6'
]);
const a11y_no_onchange = new Set([
    'select',
    'option'
]);
const a11y_labelable = new Set([
    'button',
    'input',
    'keygen',
    'meter',
    'output',
    'progress',
    'select',
    'textarea'
]);
const invisible_elements = new Set(['meta', 'html', 'script', 'style']);
const valid_modifiers = new Set([
    'preventDefault',
    'stopPropagation',
    'capture',
    'once',
    'passive',
    'nonpassive',
    'self'
]);
const passive_events = new Set([
    'wheel',
    'touchstart',
    'touchmove',
    'touchend',
    'touchcancel'
]);
const react_attributes = new Map([
    ['className', 'class'],
    ['htmlFor', 'for']
]);
function get_namespace(parent, element, explicit_namespace) {
    const parent_element = parent.find_nearest(/^Element/);
    if (!parent_element) {
        return explicit_namespace || (svg$1.test(element.name)
            ? namespaces.svg
            : null);
    }
    if (svg$1.test(element.name.toLowerCase()))
        return namespaces.svg;
    if (parent_element.name.toLowerCase() === 'foreignobject')
        return null;
    return parent_element.namespace;
}
class Element$1 extends Node$1 {
    constructor(component, parent, scope, info) {
        super(component, parent, scope, info);
        this.attributes = [];
        this.actions = [];
        this.bindings = [];
        this.classes = [];
        this.handlers = [];
        this.lets = [];
        this.intro = null;
        this.outro = null;
        this.animation = null;
        this.name = info.name;
        this.namespace = get_namespace(parent, this, component.namespace);
        if (this.namespace !== namespaces.foreign) {
            if (this.name === 'textarea') {
                if (info.children.length > 0) {
                    const value_attribute = info.attributes.find(node => node.name === 'value');
                    if (value_attribute) {
                        component.error(value_attribute, {
                            code: 'textarea-duplicate-value',
                            message: 'A <textarea> can have either a value attribute or (equivalently) child content, but not both'
                        });
                    }
                    // this is an egregious hack, but it's the easiest way to get <textarea>
                    // children treated the same way as a value attribute
                    info.attributes.push({
                        type: 'Attribute',
                        name: 'value',
                        value: info.children
                    });
                    info.children = [];
                }
            }
            if (this.name === 'option') {
                // Special case — treat these the same way:
                //   <option>{foo}</option>
                //   <option value={foo}>{foo}</option>
                const value_attribute = info.attributes.find(attribute => attribute.name === 'value');
                if (!value_attribute) {
                    info.attributes.push({
                        type: 'Attribute',
                        name: 'value',
                        value: info.children,
                        synthetic: true
                    });
                }
            }
        }
        const has_let = info.attributes.some(node => node.type === 'Let');
        if (has_let) {
            scope = scope.child();
        }
        // Binding relies on Attribute, defer its evaluation
        const order = ['Binding']; // everything else is -1
        info.attributes.sort((a, b) => order.indexOf(a.type) - order.indexOf(b.type));
        info.attributes.forEach(node => {
            switch (node.type) {
                case 'Action':
                    this.actions.push(new Action(component, this, scope, node));
                    break;
                case 'Attribute':
                case 'Spread':
                    // special case
                    if (node.name === 'xmlns')
                        this.namespace = node.value[0].data;
                    this.attributes.push(new Attribute(component, this, scope, node));
                    break;
                case 'Binding':
                    this.bindings.push(new Binding(component, this, scope, node));
                    break;
                case 'Class':
                    this.classes.push(new Class(component, this, scope, node));
                    break;
                case 'EventHandler':
                    this.handlers.push(new EventHandler(component, this, scope, node));
                    break;
                case 'Let': {
                    const l = new Let(component, this, scope, node);
                    this.lets.push(l);
                    const dependencies = new Set([l.name.name]);
                    l.names.forEach(name => {
                        scope.add(name, dependencies, this);
                    });
                    break;
                }
                case 'Transition':
                    {
                        const transition = new Transition(component, this, scope, node);
                        if (node.intro)
                            this.intro = transition;
                        if (node.outro)
                            this.outro = transition;
                        break;
                    }
                case 'Animation':
                    this.animation = new Animation(component, this, scope, node);
                    break;
                default:
                    throw new Error(`Not implemented: ${node.type}`);
            }
        });
        this.scope = scope;
        this.children = map_children(component, this, this.scope, info.children);
        this.validate();
        component.apply_stylesheet(this);
    }
    validate() {
        if (this.component.var_lookup.has(this.name) && this.component.var_lookup.get(this.name).imported) {
            this.component.warn(this, {
                code: 'component-name-lowercase',
                message: `<${this.name}> will be treated as an HTML element unless it begins with a capital letter`
            });
        }
        this.validate_attributes();
        this.validate_event_handlers();
        if (this.namespace === namespaces.foreign) {
            this.validate_bindings_foreign();
        }
        else {
            this.validate_attributes_a11y();
            this.validate_special_cases();
            this.validate_bindings();
            this.validate_content();
        }
    }
    validate_attributes() {
        const { component, parent } = this;
        this.attributes.forEach(attribute => {
            if (attribute.is_spread)
                return;
            const name = attribute.name.toLowerCase();
            // Errors
            if (/(^[0-9-.])|[\^$@%&#?!|()[\]{}^*+~;]/.test(name)) {
                component.error(attribute, {
                    code: 'illegal-attribute',
                    message: `'${name}' is not a valid attribute name`
                });
            }
            if (name === 'slot') {
                if (!attribute.is_static) {
                    component.error(attribute, {
                        code: 'invalid-slot-attribute',
                        message: 'slot attribute cannot have a dynamic value'
                    });
                }
                if (component.slot_outlets.has(name)) {
                    component.error(attribute, {
                        code: 'duplicate-slot-attribute',
                        message: `Duplicate '${name}' slot`
                    });
                    component.slot_outlets.add(name);
                }
                if (!(parent.type === 'SlotTemplate' || within_custom_element(parent))) {
                    component.error(attribute, {
                        code: 'invalid-slotted-content',
                        message: 'Element with a slot=\'...\' attribute must be a child of a component or a descendant of a custom element'
                    });
                }
            }
            // Warnings
            if (this.namespace !== namespaces.foreign) {
                if (name === 'is') {
                    component.warn(attribute, {
                        code: 'avoid-is',
                        message: 'The \'is\' attribute is not supported cross-browser and should be avoided'
                    });
                }
                if (react_attributes.has(attribute.name)) {
                    component.warn(attribute, {
                        code: 'invalid-html-attribute',
                        message: `'${attribute.name}' is not a valid HTML attribute. Did you mean '${react_attributes.get(attribute.name)}'?`
                    });
                }
            }
        });
    }
    validate_attributes_a11y() {
        const { component } = this;
        this.attributes.forEach(attribute => {
            if (attribute.is_spread)
                return;
            const name = attribute.name.toLowerCase();
            // aria-props
            if (name.startsWith('aria-')) {
                if (invisible_elements.has(this.name)) {
                    // aria-unsupported-elements
                    component.warn(attribute, {
                        code: 'a11y-aria-attributes',
                        message: `A11y: <${this.name}> should not have aria-* attributes`
                    });
                }
                const type = name.slice(5);
                if (!aria_attribute_set.has(type)) {
                    const match = fuzzymatch(type, aria_attributes);
                    let message = `A11y: Unknown aria attribute 'aria-${type}'`;
                    if (match)
                        message += ` (did you mean '${match}'?)`;
                    component.warn(attribute, {
                        code: 'a11y-unknown-aria-attribute',
                        message
                    });
                }
                if (name === 'aria-hidden' && /^h[1-6]$/.test(this.name)) {
                    component.warn(attribute, {
                        code: 'a11y-hidden',
                        message: `A11y: <${this.name}> element should not be hidden`
                    });
                }
            }
            // aria-role
            if (name === 'role') {
                if (invisible_elements.has(this.name)) {
                    // aria-unsupported-elements
                    component.warn(attribute, {
                        code: 'a11y-misplaced-role',
                        message: `A11y: <${this.name}> should not have role attribute`
                    });
                }
                const value = attribute.get_static_value();
                // @ts-ignore
                if (value && !aria_role_set.has(value)) {
                    // @ts-ignore
                    const match = fuzzymatch(value, aria_roles);
                    let message = `A11y: Unknown role '${value}'`;
                    if (match)
                        message += ` (did you mean '${match}'?)`;
                    component.warn(attribute, {
                        code: 'a11y-unknown-role',
                        message
                    });
                }
            }
            // no-access-key
            if (name === 'accesskey') {
                component.warn(attribute, {
                    code: 'a11y-accesskey',
                    message: 'A11y: Avoid using accesskey'
                });
            }
            // no-autofocus
            if (name === 'autofocus') {
                component.warn(attribute, {
                    code: 'a11y-autofocus',
                    message: 'A11y: Avoid using autofocus'
                });
            }
            // scope
            if (name === 'scope' && this.name !== 'th') {
                component.warn(attribute, {
                    code: 'a11y-misplaced-scope',
                    message: 'A11y: The scope attribute should only be used with <th> elements'
                });
            }
            // tabindex-no-positive
            if (name === 'tabindex') {
                const value = attribute.get_static_value();
                // @ts-ignore todo is tabindex=true correct case?
                if (!isNaN(value) && +value > 0) {
                    component.warn(attribute, {
                        code: 'a11y-positive-tabindex',
                        message: 'A11y: avoid tabindex values above zero'
                    });
                }
            }
        });
    }
    validate_special_cases() {
        const { component, attributes, handlers } = this;
        const attribute_map = new Map();
        const handlers_map = new Map();
        attributes.forEach(attribute => (attribute_map.set(attribute.name, attribute)));
        handlers.forEach(handler => (handlers_map.set(handler.name, handler)));
        if (this.name === 'a') {
            const href_attribute = attribute_map.get('href') || attribute_map.get('xlink:href');
            const id_attribute = attribute_map.get('id');
            const name_attribute = attribute_map.get('name');
            if (href_attribute) {
                const href_value = href_attribute.get_static_value();
                if (href_value === '' || href_value === '#' || /^\W*javascript:/i.test(href_value)) {
                    component.warn(href_attribute, {
                        code: 'a11y-invalid-attribute',
                        message: `A11y: '${href_value}' is not a valid ${href_attribute.name} attribute`
                    });
                }
            }
            else {
                const id_attribute_valid = id_attribute && id_attribute.get_static_value() !== '';
                const name_attribute_valid = name_attribute && name_attribute.get_static_value() !== '';
                if (!id_attribute_valid && !name_attribute_valid) {
                    component.warn(this, {
                        code: 'a11y-missing-attribute',
                        message: 'A11y: <a> element should have an href attribute'
                    });
                }
            }
        }
        else {
            const required_attributes = a11y_required_attributes[this.name];
            if (required_attributes) {
                const has_attribute = required_attributes.some(name => attribute_map.has(name));
                if (!has_attribute) {
                    should_have_attribute(this, required_attributes);
                }
            }
        }
        if (this.name === 'input') {
            const type = attribute_map.get('type');
            if (type && type.get_static_value() === 'image') {
                const required_attributes = ['alt', 'aria-label', 'aria-labelledby'];
                const has_attribute = required_attributes.some(name => attribute_map.has(name));
                if (!has_attribute) {
                    should_have_attribute(this, required_attributes, 'input type="image"');
                }
            }
        }
        if (this.name === 'img') {
            const alt_attribute = attribute_map.get('alt');
            const aria_hidden_attribute = attribute_map.get('aria-hidden');
            const aria_hidden_exist = aria_hidden_attribute && aria_hidden_attribute.get_static_value();
            if (alt_attribute && !aria_hidden_exist) {
                const alt_value = alt_attribute.get_static_value();
                if (/\b(image|picture|photo)\b/i.test(alt_value)) {
                    component.warn(this, {
                        code: 'a11y-img-redundant-alt',
                        message: 'A11y: Screenreaders already announce <img> elements as an image.'
                    });
                }
            }
        }
        if (this.name === 'label') {
            const has_input_child = this.children.some(i => (i instanceof Element$1 && a11y_labelable.has(i.name)));
            if (!attribute_map.has('for') && !has_input_child) {
                component.warn(this, {
                    code: 'a11y-label-has-associated-control',
                    message: 'A11y: A form label must be associated with a control.'
                });
            }
        }
        if (this.is_media_node()) {
            if (attribute_map.has('muted')) {
                return;
            }
            let has_caption;
            const track = this.children.find((i) => i.name === 'track');
            if (track) {
                has_caption = track.attributes.find(a => a.name === 'kind' && a.get_static_value() === 'captions');
            }
            if (!has_caption) {
                component.warn(this, {
                    code: 'a11y-media-has-caption',
                    message: 'A11y: Media elements must have a <track kind="captions">'
                });
            }
        }
        if (a11y_no_onchange.has(this.name)) {
            if (handlers_map.has('change') && !handlers_map.has('blur')) {
                component.warn(this, {
                    code: 'a11y-no-onchange',
                    message: 'A11y: on:blur must be used instead of on:change, unless absolutely necessary and it causes no negative consequences for keyboard only or screen reader users.'
                });
            }
        }
        if (a11y_distracting_elements.has(this.name)) {
            // no-distracting-elements
            component.warn(this, {
                code: 'a11y-distracting-elements',
                message: `A11y: Avoid <${this.name}> elements`
            });
        }
        if (this.name === 'figcaption') {
            let { parent } = this;
            let is_figure_parent = false;
            while (parent) {
                if (parent.name === 'figure') {
                    is_figure_parent = true;
                    break;
                }
                if (parent.type === 'Element') {
                    break;
                }
                parent = parent.parent;
            }
            if (!is_figure_parent) {
                component.warn(this, {
                    code: 'a11y-structure',
                    message: 'A11y: <figcaption> must be an immediate child of <figure>'
                });
            }
        }
        if (this.name === 'figure') {
            const children = this.children.filter(node => {
                if (node.type === 'Comment')
                    return false;
                if (node.type === 'Text')
                    return /\S/.test(node.data);
                return true;
            });
            const index = children.findIndex(child => child.name === 'figcaption');
            if (index !== -1 && (index !== 0 && index !== children.length - 1)) {
                component.warn(children[index], {
                    code: 'a11y-structure',
                    message: 'A11y: <figcaption> must be first or last child of <figure>'
                });
            }
        }
    }
    validate_bindings_foreign() {
        this.bindings.forEach(binding => {
            if (binding.name !== 'this') {
                this.component.error(binding, {
                    code: 'invalid-binding',
                    message: `'${binding.name}' is not a valid binding. Foreign elements only support bind:this`
                });
            }
        });
    }
    validate_bindings() {
        const { component } = this;
        const check_type_attribute = () => {
            const attribute = this.attributes.find((attribute) => attribute.name === 'type');
            if (!attribute)
                return null;
            if (!attribute.is_static) {
                component.error(attribute, {
                    code: 'invalid-type',
                    message: '\'type\' attribute cannot be dynamic if input uses two-way binding'
                });
            }
            const value = attribute.get_static_value();
            if (value === true) {
                component.error(attribute, {
                    code: 'missing-type',
                    message: '\'type\' attribute must be specified'
                });
            }
            return value;
        };
        this.bindings.forEach(binding => {
            const { name } = binding;
            if (name === 'value') {
                if (this.name !== 'input' &&
                    this.name !== 'textarea' &&
                    this.name !== 'select') {
                    component.error(binding, {
                        code: 'invalid-binding',
                        message: `'value' is not a valid binding on <${this.name}> elements`
                    });
                }
                if (this.name === 'select') {
                    const attribute = this.attributes.find((attribute) => attribute.name === 'multiple');
                    if (attribute && !attribute.is_static) {
                        component.error(attribute, {
                            code: 'dynamic-multiple-attribute',
                            message: '\'multiple\' attribute cannot be dynamic if select uses two-way binding'
                        });
                    }
                }
                else {
                    check_type_attribute();
                }
            }
            else if (name === 'checked' || name === 'indeterminate') {
                if (this.name !== 'input') {
                    component.error(binding, {
                        code: 'invalid-binding',
                        message: `'${name}' is not a valid binding on <${this.name}> elements`
                    });
                }
                const type = check_type_attribute();
                if (type !== 'checkbox') {
                    let message = `'${name}' binding can only be used with <input type="checkbox">`;
                    if (type === 'radio')
                        message += ' — for <input type="radio">, use \'group\' binding';
                    component.error(binding, { code: 'invalid-binding', message });
                }
            }
            else if (name === 'group') {
                if (this.name !== 'input') {
                    component.error(binding, {
                        code: 'invalid-binding',
                        message: `'group' is not a valid binding on <${this.name}> elements`
                    });
                }
                const type = check_type_attribute();
                if (type !== 'checkbox' && type !== 'radio') {
                    component.error(binding, {
                        code: 'invalid-binding',
                        message: '\'group\' binding can only be used with <input type="checkbox"> or <input type="radio">'
                    });
                }
            }
            else if (name === 'files') {
                if (this.name !== 'input') {
                    component.error(binding, {
                        code: 'invalid-binding',
                        message: `'files' is not a valid binding on <${this.name}> elements`
                    });
                }
                const type = check_type_attribute();
                if (type !== 'file') {
                    component.error(binding, {
                        code: 'invalid-binding',
                        message: '\'files\' binding can only be used with <input type="file">'
                    });
                }
            }
            else if (name === 'open') {
                if (this.name !== 'details') {
                    component.error(binding, {
                        code: 'invalid-binding',
                        message: `'${name}' binding can only be used with <details>`
                    });
                }
            }
            else if (name === 'currentTime' ||
                name === 'duration' ||
                name === 'paused' ||
                name === 'buffered' ||
                name === 'seekable' ||
                name === 'played' ||
                name === 'volume' ||
                name === 'muted' ||
                name === 'playbackRate' ||
                name === 'seeking' ||
                name === 'ended') {
                if (this.name !== 'audio' && this.name !== 'video') {
                    component.error(binding, {
                        code: 'invalid-binding',
                        message: `'${name}' binding can only be used with <audio> or <video>`
                    });
                }
            }
            else if (name === 'videoHeight' ||
                name === 'videoWidth') {
                if (this.name !== 'video') {
                    component.error(binding, {
                        code: 'invalid-binding',
                        message: `'${name}' binding can only be used with <video>`
                    });
                }
            }
            else if (dimensions.test(name)) {
                if (this.name === 'svg' && (name === 'offsetWidth' || name === 'offsetHeight')) {
                    component.error(binding, {
                        code: 'invalid-binding',
                        message: `'${binding.name}' is not a valid binding on <svg>. Use '${name.replace('offset', 'client')}' instead`
                    });
                }
                else if (svg$1.test(this.name)) {
                    component.error(binding, {
                        code: 'invalid-binding',
                        message: `'${binding.name}' is not a valid binding on SVG elements`
                    });
                }
                else if (is_void(this.name)) {
                    component.error(binding, {
                        code: 'invalid-binding',
                        message: `'${binding.name}' is not a valid binding on void elements like <${this.name}>. Use a wrapper element instead`
                    });
                }
            }
            else if (name === 'textContent' ||
                name === 'innerHTML') {
                const contenteditable = this.attributes.find((attribute) => attribute.name === 'contenteditable');
                if (!contenteditable) {
                    component.error(binding, {
                        code: 'missing-contenteditable-attribute',
                        message: '\'contenteditable\' attribute is required for textContent and innerHTML two-way bindings'
                    });
                }
                else if (contenteditable && !contenteditable.is_static) {
                    component.error(contenteditable, {
                        code: 'dynamic-contenteditable-attribute',
                        message: '\'contenteditable\' attribute cannot be dynamic if element uses two-way binding'
                    });
                }
            }
            else if (name !== 'this') {
                component.error(binding, {
                    code: 'invalid-binding',
                    message: `'${binding.name}' is not a valid binding`
                });
            }
        });
    }
    validate_content() {
        if (!a11y_required_content.has(this.name))
            return;
        if (this.bindings
            .some((binding) => ['textContent', 'innerHTML'].includes(binding.name)))
            return;
        if (this.children.length === 0) {
            this.component.warn(this, {
                code: 'a11y-missing-content',
                message: `A11y: <${this.name}> element should have child content`
            });
        }
    }
    validate_event_handlers() {
        const { component } = this;
        this.handlers.forEach(handler => {
            if (handler.modifiers.has('passive') && handler.modifiers.has('preventDefault')) {
                component.error(handler, {
                    code: 'invalid-event-modifier',
                    message: 'The \'passive\' and \'preventDefault\' modifiers cannot be used together'
                });
            }
            if (handler.modifiers.has('passive') && handler.modifiers.has('nonpassive')) {
                component.error(handler, {
                    code: 'invalid-event-modifier',
                    message: 'The \'passive\' and \'nonpassive\' modifiers cannot be used together'
                });
            }
            handler.modifiers.forEach(modifier => {
                if (!valid_modifiers.has(modifier)) {
                    component.error(handler, {
                        code: 'invalid-event-modifier',
                        message: `Valid event modifiers are ${list(Array.from(valid_modifiers))}`
                    });
                }
                if (modifier === 'passive') {
                    if (passive_events.has(handler.name)) {
                        if (handler.can_make_passive) {
                            component.warn(handler, {
                                code: 'redundant-event-modifier',
                                message: 'Touch event handlers that don\'t use the \'event\' object are passive by default'
                            });
                        }
                    }
                    else {
                        component.warn(handler, {
                            code: 'redundant-event-modifier',
                            message: 'The passive modifier only works with wheel and touch events'
                        });
                    }
                }
                if (component.compile_options.legacy && (modifier === 'once' || modifier === 'passive')) {
                    // TODO this could be supported, but it would need a few changes to
                    // how event listeners work
                    component.error(handler, {
                        code: 'invalid-event-modifier',
                        message: `The '${modifier}' modifier cannot be used in legacy mode`
                    });
                }
            });
            if (passive_events.has(handler.name) && handler.can_make_passive && !handler.modifiers.has('preventDefault') && !handler.modifiers.has('nonpassive')) {
                // touch/wheel events should be passive by default
                handler.modifiers.add('passive');
            }
        });
    }
    is_media_node() {
        return this.name === 'audio' || this.name === 'video';
    }
    add_css_class() {
        if (this.attributes.some(attr => attr.is_spread)) {
            this.needs_manual_style_scoping = true;
            return;
        }
        const { id } = this.component.stylesheet;
        const class_attribute = this.attributes.find(a => a.name === 'class');
        if (class_attribute && !class_attribute.is_true) {
            if (class_attribute.chunks.length === 1 && class_attribute.chunks[0].type === 'Text') {
                class_attribute.chunks[0].data += ` ${id}`;
            }
            else {
                class_attribute.chunks.push(new Text(this.component, this, this.scope, {
                    type: 'Text',
                    data: ` ${id}`,
                    synthetic: true
                }));
            }
        }
        else {
            this.attributes.push(new Attribute(this.component, this, this.scope, {
                type: 'Attribute',
                name: 'class',
                value: [{ type: 'Text', data: id, synthetic: true }]
            }));
        }
    }
    get slot_template_name() {
        return this.attributes.find(attribute => attribute.name === 'slot').get_static_value();
    }
}
function should_have_attribute(node, attributes, name = node.name) {
    const article = /^[aeiou]/.test(attributes[0]) ? 'an' : 'a';
    const sequence = attributes.length > 1 ?
        attributes.slice(0, -1).join(', ') + ` or ${attributes[attributes.length - 1]}` :
        attributes[0];
    node.component.warn(node, {
        code: 'a11y-missing-attribute',
        message: `A11y: <${name}> element should have ${article} ${sequence} attribute`
    });
}
function within_custom_element(parent) {
    while (parent) {
        if (parent.type === 'InlineComponent')
            return false;
        if (parent.type === 'Element' && /-/.test(parent.name))
            return true;
        parent = parent.parent;
    }
    return false;
}

// https://github.com/darkskyapp/string-hash/blob/master/index.js
function hash(str) {
    str = str.replace(/\r/g, '');
    let hash = 5381;
    let i = str.length;
    while (i--)
        hash = ((hash << 5) - hash) ^ str.charCodeAt(i);
    return (hash >>> 0).toString(36);
}

class Head$1 extends Node$1 {
    constructor(component, parent, scope, info) {
        super(component, parent, scope, info);
        if (info.attributes.length) {
            component.error(info.attributes[0], {
                code: 'invalid-attribute',
                message: '<svelte:head> should not have any attributes or directives'
            });
        }
        this.children = map_children(component, parent, scope, info.children.filter(child => {
            return (child.type !== 'Text' || /\S/.test(child.data));
        }));
        if (this.children.length > 0) {
            this.id = `svelte-${hash(this.component.source.slice(this.start, this.end))}`;
        }
    }
}

class IfBlock$1 extends AbstractBlock {
    constructor(component, parent, scope, info) {
        super(component, parent, scope, info);
        this.expression = new Expression(component, this, scope, info.expression);
        this.children = map_children(component, this, scope, info.children);
        this.else = info.else
            ? new ElseBlock(component, this, scope, info.else)
            : null;
        this.warn_if_empty_block();
    }
}

class InlineComponent$1 extends Node$1 {
    constructor(component, parent, scope, info) {
        super(component, parent, scope, info);
        this.attributes = [];
        this.bindings = [];
        this.handlers = [];
        this.lets = [];
        if (info.name !== 'svelte:component' && info.name !== 'svelte:self') {
            const name = info.name.split('.')[0]; // accommodate namespaces
            component.warn_if_undefined(name, info, scope);
            component.add_reference(name);
        }
        this.name = info.name;
        this.expression = this.name === 'svelte:component'
            ? new Expression(component, this, scope, info.expression)
            : null;
        info.attributes.forEach(node => {
            /* eslint-disable no-fallthrough */
            switch (node.type) {
                case 'Action':
                    component.error(node, {
                        code: 'invalid-action',
                        message: 'Actions can only be applied to DOM elements, not components'
                    });
                case 'Attribute':
                // fallthrough
                case 'Spread':
                    this.attributes.push(new Attribute(component, this, scope, node));
                    break;
                case 'Binding':
                    this.bindings.push(new Binding(component, this, scope, node));
                    break;
                case 'Class':
                    component.error(node, {
                        code: 'invalid-class',
                        message: 'Classes can only be applied to DOM elements, not components'
                    });
                case 'EventHandler':
                    this.handlers.push(new EventHandler(component, this, scope, node));
                    break;
                case 'Let':
                    this.lets.push(new Let(component, this, scope, node));
                    break;
                case 'Transition':
                    component.error(node, {
                        code: 'invalid-transition',
                        message: 'Transitions can only be applied to DOM elements, not components'
                    });
                default:
                    throw new Error(`Not implemented: ${node.type}`);
            }
            /* eslint-enable no-fallthrough */
        });
        if (this.lets.length > 0) {
            this.scope = scope.child();
            this.lets.forEach(l => {
                const dependencies = new Set([l.name.name]);
                l.names.forEach(name => {
                    this.scope.add(name, dependencies, this);
                });
            });
        }
        else {
            this.scope = scope;
        }
        this.handlers.forEach(handler => {
            handler.modifiers.forEach(modifier => {
                if (modifier !== 'once') {
                    component.error(handler, {
                        code: 'invalid-event-modifier',
                        message: "Event modifiers other than 'once' can only be used on DOM elements"
                    });
                }
            });
        });
        const children = [];
        for (let i = info.children.length - 1; i >= 0; i--) {
            const child = info.children[i];
            if (child.type === 'SlotTemplate') {
                children.push(child);
                info.children.splice(i, 1);
            }
            else if ((child.type === 'Element' || child.type === 'InlineComponent' || child.type === 'Slot') && child.attributes.find(attribute => attribute.name === 'slot')) {
                const slot_template = {
                    start: child.start,
                    end: child.end,
                    type: 'SlotTemplate',
                    name: 'svelte:fragment',
                    attributes: [],
                    children: [child]
                };
                // transfer attributes
                for (let i = child.attributes.length - 1; i >= 0; i--) {
                    const attribute = child.attributes[i];
                    if (attribute.type === 'Let') {
                        slot_template.attributes.push(attribute);
                        child.attributes.splice(i, 1);
                    }
                    else if (attribute.type === 'Attribute' && attribute.name === 'slot') {
                        slot_template.attributes.push(attribute);
                    }
                }
                children.push(slot_template);
                info.children.splice(i, 1);
            }
        }
        if (info.children.some(node => not_whitespace_text(node))) {
            children.push({
                start: info.start,
                end: info.end,
                type: 'SlotTemplate',
                name: 'svelte:fragment',
                attributes: [],
                children: info.children
            });
        }
        this.children = map_children(component, this, this.scope, children);
    }
    get slot_template_name() {
        return this.attributes.find(attribute => attribute.name === 'slot').get_static_value();
    }
}
function not_whitespace_text(node) {
    return !(node.type === 'Text' && /^\s+$/.test(node.data));
}

class KeyBlock$1 extends AbstractBlock {
    constructor(component, parent, scope, info) {
        super(component, parent, scope, info);
        this.expression = new Expression(component, this, scope, info.expression);
        this.children = map_children(component, this, scope, info.children);
        this.warn_if_empty_block();
    }
}

class Tag$1 extends Node$1 {
    constructor(component, parent, scope, info) {
        super(component, parent, scope, info);
        this.expression = new Expression(component, this, scope, info.expression);
        this.should_cache = (info.expression.type !== 'Identifier' ||
            (this.expression.dependencies.size && scope.names.has(info.expression.name)));
    }
}

class MustacheTag extends Tag$1 {
}

class Options extends Node$1 {
}

class RawMustacheTag extends Tag$1 {
}

class DebugTag$1 extends Node$1 {
    constructor(component, parent, scope, info) {
        super(component, parent, scope, info);
        this.expressions = info.identifiers.map((node) => {
            return new Expression(component, parent, scope, node);
        });
    }
}

class Slot$1 extends Element$1 {
    constructor(component, parent, scope, info) {
        super(component, parent, scope, info);
        this.values = new Map();
        info.attributes.forEach(attr => {
            if (attr.type !== 'Attribute' && attr.type !== 'Spread') {
                component.error(attr, {
                    code: 'invalid-slot-directive',
                    message: '<slot> cannot have directives'
                });
            }
            if (attr.name === 'name') {
                if (attr.value.length !== 1 || attr.value[0].type !== 'Text') {
                    component.error(attr, {
                        code: 'dynamic-slot-name',
                        message: '<slot> name cannot be dynamic'
                    });
                }
                this.slot_name = attr.value[0].data;
                if (this.slot_name === 'default') {
                    component.error(attr, {
                        code: 'invalid-slot-name',
                        message: 'default is a reserved word — it cannot be used as a slot name'
                    });
                }
            }
            this.values.set(attr.name, new Attribute(component, this, scope, attr));
        });
        if (!this.slot_name)
            this.slot_name = 'default';
        if (this.slot_name === 'default') {
            // if this is the default slot, add our dependencies to any
            // other slots (which inherit our slot values) that were
            // previously encountered
            component.slots.forEach((slot) => {
                this.values.forEach((attribute, name) => {
                    if (!slot.values.has(name)) {
                        slot.values.set(name, attribute);
                    }
                });
            });
        }
        else if (component.slots.has('default')) {
            // otherwise, go the other way — inherit values from
            // a previously encountered default slot
            const default_slot = component.slots.get('default');
            default_slot.values.forEach((attribute, name) => {
                if (!this.values.has(name)) {
                    this.values.set(name, attribute);
                }
            });
        }
        component.slots.set(this.slot_name, this);
    }
}

class Title extends Node$1 {
    constructor(component, parent, scope, info) {
        super(component, parent, scope, info);
        this.children = map_children(component, parent, scope, info.children);
        if (info.attributes.length > 0) {
            component.error(info.attributes[0], {
                code: 'illegal-attribute',
                message: '<title> cannot have attributes'
            });
        }
        info.children.forEach(child => {
            if (child.type !== 'Text' && child.type !== 'MustacheTag') {
                component.error(child, {
                    code: 'illegal-structure',
                    message: '<title> can only contain text and {tags}'
                });
            }
        });
        this.should_cache = info.children.length === 1
            ? (info.children[0].type !== 'Identifier' ||
                scope.names.has(info.children[0].name))
            : true;
    }
}

const valid_bindings = [
    'innerWidth',
    'innerHeight',
    'outerWidth',
    'outerHeight',
    'scrollX',
    'scrollY',
    'online'
];
class Window extends Node$1 {
    constructor(component, parent, scope, info) {
        super(component, parent, scope, info);
        this.handlers = [];
        this.bindings = [];
        this.actions = [];
        info.attributes.forEach(node => {
            if (node.type === 'EventHandler') {
                this.handlers.push(new EventHandler(component, this, scope, node));
            }
            else if (node.type === 'Binding') {
                if (node.expression.type !== 'Identifier') {
                    const { parts } = flatten_reference(node.expression);
                    // TODO is this constraint necessary?
                    component.error(node.expression, {
                        code: 'invalid-binding',
                        message: `Bindings on <svelte:window> must be to top-level properties, e.g. '${parts[parts.length - 1]}' rather than '${parts.join('.')}'`
                    });
                }
                if (!~valid_bindings.indexOf(node.name)) {
                    const match = (node.name === 'width' ? 'innerWidth' :
                        node.name === 'height' ? 'innerHeight' :
                            fuzzymatch(node.name, valid_bindings));
                    const message = `'${node.name}' is not a valid binding on <svelte:window>`;
                    if (match) {
                        component.error(node, {
                            code: 'invalid-binding',
                            message: `${message} (did you mean '${match}'?)`
                        });
                    }
                    else {
                        component.error(node, {
                            code: 'invalid-binding',
                            message: `${message} — valid bindings are ${list(valid_bindings)}`
                        });
                    }
                }
                this.bindings.push(new Binding(component, this, scope, node));
            }
            else if (node.type === 'Action') {
                this.actions.push(new Action(component, this, scope, node));
            }
        });
    }
}

function get_constructor(type) {
    switch (type) {
        case 'AwaitBlock': return AwaitBlock$1;
        case 'Body': return Body;
        case 'Comment': return Comment$2;
        case 'EachBlock': return EachBlock$1;
        case 'Element': return Element$1;
        case 'Head': return Head$1;
        case 'IfBlock': return IfBlock$1;
        case 'InlineComponent': return InlineComponent$1;
        case 'KeyBlock': return KeyBlock$1;
        case 'MustacheTag': return MustacheTag;
        case 'Options': return Options;
        case 'RawMustacheTag': return RawMustacheTag;
        case 'DebugTag': return DebugTag$1;
        case 'Slot': return Slot$1;
        case 'SlotTemplate': return SlotTemplate;
        case 'Text': return Text;
        case 'Title': return Title;
        case 'Window': return Window;
        default: throw new Error(`Not implemented: ${type}`);
    }
}
function map_children(component, parent, scope, children) {
    let last = null;
    let ignores = [];
    return children.map(child => {
        const constructor = get_constructor(child.type);
        const use_ignores = child.type !== 'Text' && child.type !== 'Comment' && ignores.length;
        if (use_ignores)
            component.push_ignores(ignores);
        const node = new constructor(component, parent, scope, child);
        if (use_ignores)
            component.pop_ignores(), ignores = [];
        if (node.type === 'Comment' && node.ignores.length) {
            ignores.push(...node.ignores);
        }
        if (last)
            last.next = node;
        node.prev = last;
        last = node;
        return node;
    });
}

class SlotTemplate extends Node$1 {
    constructor(component, parent, scope, info) {
        super(component, parent, scope, info);
        this.lets = [];
        this.slot_template_name = 'default';
        this.validate_slot_template_placement();
        const has_let = info.attributes.some((node) => node.type === 'Let');
        if (has_let) {
            scope = scope.child();
        }
        info.attributes.forEach((node) => {
            switch (node.type) {
                case 'Let': {
                    const l = new Let(component, this, scope, node);
                    this.lets.push(l);
                    const dependencies = new Set([l.name.name]);
                    l.names.forEach((name) => {
                        scope.add(name, dependencies, this);
                    });
                    break;
                }
                case 'Attribute': {
                    if (node.name === 'slot') {
                        this.slot_attribute = new Attribute(component, this, scope, node);
                        if (!this.slot_attribute.is_static) {
                            component.error(node, {
                                code: 'invalid-slot-attribute',
                                message: 'slot attribute cannot have a dynamic value'
                            });
                        }
                        const value = this.slot_attribute.get_static_value();
                        if (typeof value === 'boolean') {
                            component.error(node, {
                                code: 'invalid-slot-attribute',
                                message: 'slot attribute value is missing'
                            });
                        }
                        this.slot_template_name = value;
                        break;
                    }
                    throw new Error(`Invalid attribute '${node.name}' in <svelte:fragment>`);
                }
                default:
                    throw new Error(`Not implemented: ${node.type}`);
            }
        });
        this.scope = scope;
        this.children = map_children(component, this, this.scope, info.children);
    }
    validate_slot_template_placement() {
        if (this.parent.type !== 'InlineComponent') {
            this.component.error(this, {
                code: 'invalid-slotted-content',
                message: '<svelte:fragment> must be a child of a component'
            });
        }
    }
}

function SlotTemplate$1 (node, renderer, options) {
    const parent_inline_component = node.parent;
    const children = remove_whitespace_children(node instanceof SlotTemplate ? node.children : [node], node.next);
    renderer.push();
    renderer.render(children, options);
    const lets = node.lets;
    const seen = new Set(lets.map(l => l.name.name));
    parent_inline_component.lets.forEach(l => {
        if (!seen.has(l.name.name))
            lets.push(l);
    });
    const slot_fragment_content = renderer.pop();
    if (!is_empty_template_literal(slot_fragment_content)) {
        if (options.slot_scopes.has(node.slot_template_name)) {
            if (node.slot_template_name === 'default') {
                throw new Error('Found elements without slot attribute when using slot="default"');
            }
            throw new Error(`Duplicate slot name "${node.slot_template_name}" in <${parent_inline_component.name}>`);
        }
        options.slot_scopes.set(node.slot_template_name, {
            input: get_slot_scope(node.lets),
            output: slot_fragment_content
        });
    }
}
function is_empty_template_literal(template_literal) {
    return (template_literal.expressions.length === 0 &&
        template_literal.quasis.length === 1 &&
        template_literal.quasis[0].value.raw === '');
}

function Tag$2 (node, renderer, _options) {
    const snippet = node.expression.node;
    renderer.add_expression(node.parent &&
        node.parent.type === 'Element' &&
        node.parent.name === 'style'
        ? snippet
        : x `@escape(${snippet})`);
}

function Text$1 (node, renderer, _options) {
    let text = node.data;
    if (!node.parent ||
        node.parent.type !== 'Element' ||
        (node.parent.name !== 'script' && node.parent.name !== 'style')) {
        // unless this Text node is inside a <script> or <style> element, escape &,<,>
        text = escape_html(text);
    }
    renderer.add_string(text);
}

function Title$1 (node, renderer, options) {
    renderer.push();
    renderer.add_string('<title>');
    renderer.render(node.children, options);
    renderer.add_string('</title>');
    const result = renderer.pop();
    renderer.add_expression(x `$$result.title = ${result}, ""`);
}

function noop$1() { }
const handlers$1 = {
    AwaitBlock,
    Body: noop$1,
    Comment: Comment$1,
    DebugTag,
    EachBlock,
    Element,
    Head,
    IfBlock,
    InlineComponent,
    KeyBlock,
    MustacheTag: Tag$2,
    Options: noop$1,
    RawMustacheTag: HtmlTag,
    Slot,
    SlotTemplate: SlotTemplate$1,
    Text: Text$1,
    Title: Title$1,
    Window: noop$1
};
class Renderer$1 {
    constructor({ name }) {
        this.has_bindings = false;
        this.stack = [];
        this.targets = [];
        this.name = name;
        this.push();
    }
    add_string(str) {
        this.current.value += escape_template(str);
    }
    add_expression(node) {
        this.literal.quasis.push({
            type: 'TemplateElement',
            value: { raw: this.current.value, cooked: null },
            tail: false
        });
        this.literal.expressions.push(node);
        this.current.value = '';
    }
    push() {
        const current = this.current = { value: '' };
        const literal = this.literal = {
            type: 'TemplateLiteral',
            expressions: [],
            quasis: []
        };
        this.stack.push({ current, literal });
    }
    pop() {
        this.literal.quasis.push({
            type: 'TemplateElement',
            value: { raw: this.current.value, cooked: null },
            tail: true
        });
        const popped = this.stack.pop();
        const last = this.stack[this.stack.length - 1];
        if (last) {
            this.literal = last.literal;
            this.current = last.current;
        }
        return popped.literal;
    }
    render(nodes, options) {
        nodes.forEach(node => {
            const handler = handlers$1[node.type];
            if (!handler) {
                throw new Error(`No handler for '${node.type}' nodes`);
            }
            handler(node, this, options);
        });
    }
}

function ssr(component, options) {
    const renderer = new Renderer$1({
        name: component.name
    });
    const { name } = component;
    // create $$render function
    renderer.render(trim(component.fragment.children), Object.assign({
        locate: component.locate
    }, options));
    // TODO put this inside the Renderer class
    const literal = renderer.pop();
    // TODO concatenate CSS maps
    const css = options.customElement ?
        { code: null, map: null } :
        component.stylesheet.render(options.filename, true);
    const uses_rest = component.var_lookup.has('$$restProps');
    const props = component.vars.filter(variable => !variable.module && variable.export_name);
    const rest = uses_rest ? b `let $$restProps = @compute_rest_props($$props, [${props.map(prop => `"${prop.export_name}"`).join(',')}]);` : null;
    const uses_slots = component.var_lookup.has('$$slots');
    const slots = uses_slots ? b `let $$slots = @compute_slots(#slots);` : null;
    const reactive_stores = component.vars.filter(variable => variable.name[0] === '$' && variable.name[1] !== '$');
    const reactive_store_subscriptions = reactive_stores
        .filter(store => {
        const variable = component.var_lookup.get(store.name.slice(1));
        return !variable || variable.hoistable;
    })
        .map(({ name }) => {
        const store_name = name.slice(1);
        return b `
				${component.compile_options.dev && b `@validate_store(${store_name}, '${store_name}');`}
				${`$$unsubscribe_${store_name}`} = @subscribe(${store_name}, #value => ${name} = #value)
			`;
    });
    const reactive_store_unsubscriptions = reactive_stores.map(({ name }) => b `${`$$unsubscribe_${name.slice(1)}`}()`);
    const reactive_store_declarations = reactive_stores
        .map(({ name }) => {
        const store_name = name.slice(1);
        const store = component.var_lookup.get(store_name);
        if (store && store.reassigned) {
            const unsubscribe = `$$unsubscribe_${store_name}`;
            const subscribe = `$$subscribe_${store_name}`;
            return b `let ${name}, ${unsubscribe} = @noop, ${subscribe} = () => (${unsubscribe}(), ${unsubscribe} = @subscribe(${store_name}, $$value => ${name} = $$value), ${store_name})`;
        }
        return b `let ${name}, ${`$$unsubscribe_${store_name}`};`;
    });
    // instrument get/set store value
    if (component.ast.instance) {
        let scope = component.instance_scope;
        const map = component.instance_scope_map;
        walk(component.ast.instance.content, {
            enter(node) {
                if (map.has(node)) {
                    scope = map.get(node);
                }
            },
            leave(node) {
                if (map.has(node)) {
                    scope = scope.parent;
                }
                if (node.type === 'AssignmentExpression' || node.type === 'UpdateExpression') {
                    const assignee = node.type === 'AssignmentExpression' ? node.left : node.argument;
                    const names = new Set(extract_names(assignee));
                    const to_invalidate = new Set();
                    for (const name of names) {
                        const variable = component.var_lookup.get(name);
                        if (variable &&
                            !variable.hoistable &&
                            !variable.global &&
                            !variable.module &&
                            (variable.subscribable || variable.name[0] === '$')) {
                            to_invalidate.add(variable.name);
                        }
                    }
                    if (to_invalidate.size) {
                        this.replace(invalidate({ component }, scope, node, to_invalidate, true));
                    }
                }
            }
        });
    }
    component.rewrite_props(({ name, reassigned }) => {
        const value = `$${name}`;
        let insert = reassigned
            ? b `${`$$subscribe_${name}`}()`
            : b `${`$$unsubscribe_${name}`} = @subscribe(${name}, #value => $${value} = #value)`;
        if (component.compile_options.dev) {
            insert = b `@validate_store(${name}, '${name}'); ${insert}`;
        }
        return insert;
    });
    const instance_javascript = component.extract_javascript(component.ast.instance);
    // TODO only do this for props with a default value
    const parent_bindings = instance_javascript
        ? component.vars
            .filter(variable => !variable.module && variable.export_name)
            .map(prop => {
            return b `if ($$props.${prop.export_name} === void 0 && $$bindings.${prop.export_name} && ${prop.name} !== void 0) $$bindings.${prop.export_name}(${prop.name});`;
        })
        : [];
    const injected = Array.from(component.injected_reactive_declaration_vars).filter(name => {
        const variable = component.var_lookup.get(name);
        return variable.injected;
    });
    const reactive_declarations = component.reactive_declarations.map(d => {
        const body = d.node.body;
        let statement = b `${body}`;
        if (!d.declaration) { // TODO do not add label if it's not referenced
            statement = b `$: { ${statement} }`;
        }
        return statement;
    });
    const main = renderer.has_bindings
        ? b `
			let $$settled;
			let $$rendered;

			do {
				$$settled = true;

				${reactive_declarations}

				$$rendered = ${literal};
			} while (!$$settled);

			${reactive_store_unsubscriptions}

			return $$rendered;
		`
        : b `
			${reactive_declarations}

			${reactive_store_unsubscriptions}

			return ${literal};`;
    const blocks = [
        ...injected.map(name => b `let ${name};`),
        rest,
        slots,
        ...reactive_store_declarations,
        ...reactive_store_subscriptions,
        instance_javascript,
        ...parent_bindings,
        css.code && b `$$result.css.add(#css);`,
        main
    ].filter(Boolean);
    const js = b `
		${css.code ? b `
		const #css = {
			code: "${css.code}",
			map: ${css.map ? string_literal(css.map.toString()) : 'null'}
		};` : null}

		${component.extract_javascript(component.ast.module)}

		${component.fully_hoisted}

		const ${name} = @create_ssr_component(($$result, $$props, $$bindings, #slots) => {
			${blocks}
		});
	`;
    return { js, css };
}
function trim(nodes) {
    let start = 0;
    for (; start < nodes.length; start += 1) {
        const node = nodes[start];
        if (node.type !== 'Text')
            break;
        node.data = node.data.replace(/^\s+/, '');
        if (node.data)
            break;
    }
    let end = nodes.length;
    for (; end > start; end -= 1) {
        const node = nodes[end - 1];
        if (node.type !== 'Text')
            break;
        node.data = node.data.replace(/\s+$/, '');
        if (node.data)
            break;
    }
    return nodes.slice(start, end);
}

const wrappers$1 = { esm, cjs };
function create_module(program, format, name, banner, sveltePath = 'svelte', helpers, globals, imports, module_exports) {
    const internal_path = `${sveltePath}/internal`;
    helpers.sort((a, b) => (a.name < b.name) ? -1 : 1);
    globals.sort((a, b) => (a.name < b.name) ? -1 : 1);
    if (format === 'esm') {
        return esm(program, name, banner, sveltePath, internal_path, helpers, globals, imports, module_exports);
    }
    if (format === 'cjs')
        return cjs(program, name, banner, sveltePath, internal_path, helpers, globals, imports, module_exports);
    throw new Error(`options.format is invalid (must be ${list(Object.keys(wrappers$1))})`);
}
function edit_source(source, sveltePath) {
    return source === 'svelte' || source.startsWith('svelte/')
        ? source.replace('svelte', sveltePath)
        : source;
}
function get_internal_globals(globals, helpers) {
    return globals.length > 0 && {
        type: 'VariableDeclaration',
        kind: 'const',
        declarations: [{
                type: 'VariableDeclarator',
                id: {
                    type: 'ObjectPattern',
                    properties: globals.map(g => ({
                        type: 'Property',
                        method: false,
                        shorthand: false,
                        computed: false,
                        key: { type: 'Identifier', name: g.name },
                        value: g.alias,
                        kind: 'init'
                    }))
                },
                init: helpers.find(({ name }) => name === 'globals').alias
            }]
    };
}
function esm(program, name, banner, sveltePath, internal_path, helpers, globals, imports, module_exports) {
    const import_declaration = {
        type: 'ImportDeclaration',
        specifiers: helpers.map(h => ({
            type: 'ImportSpecifier',
            local: h.alias,
            imported: { type: 'Identifier', name: h.name }
        })),
        source: { type: 'Literal', value: internal_path }
    };
    const internal_globals = get_internal_globals(globals, helpers);
    // edit user imports
    imports.forEach(node => {
        node.source.value = edit_source(node.source.value, sveltePath);
    });
    const exports = module_exports.length > 0 && {
        type: 'ExportNamedDeclaration',
        specifiers: module_exports.map(x => ({
            type: 'Specifier',
            local: { type: 'Identifier', name: x.name },
            exported: { type: 'Identifier', name: x.as }
        }))
    };
    program.body = b `
		/* ${banner} */

		${import_declaration}
		${internal_globals}
		${imports}

		${program.body}

		export default ${name};
		${exports}
	`;
}
function cjs(program, name, banner, sveltePath, internal_path, helpers, globals, imports, module_exports) {
    const internal_requires = {
        type: 'VariableDeclaration',
        kind: 'const',
        declarations: [{
                type: 'VariableDeclarator',
                id: {
                    type: 'ObjectPattern',
                    properties: helpers.map(h => ({
                        type: 'Property',
                        method: false,
                        shorthand: false,
                        computed: false,
                        key: { type: 'Identifier', name: h.name },
                        value: h.alias,
                        kind: 'init'
                    }))
                },
                init: x `require("${internal_path}")`
            }]
    };
    const internal_globals = get_internal_globals(globals, helpers);
    const user_requires = imports.map(node => {
        const init = x `require("${edit_source(node.source.value, sveltePath)}")`;
        if (node.specifiers.length === 0) {
            return b `${init};`;
        }
        return {
            type: 'VariableDeclaration',
            kind: 'const',
            declarations: [{
                    type: 'VariableDeclarator',
                    id: node.specifiers[0].type === 'ImportNamespaceSpecifier'
                        ? { type: 'Identifier', name: node.specifiers[0].local.name }
                        : {
                            type: 'ObjectPattern',
                            properties: node.specifiers.map(s => ({
                                type: 'Property',
                                method: false,
                                shorthand: false,
                                computed: false,
                                key: s.type === 'ImportSpecifier' ? s.imported : { type: 'Identifier', name: 'default' },
                                value: s.local,
                                kind: 'init'
                            }))
                        },
                    init
                }]
        };
    });
    const exports = module_exports.map(x => b `exports.${{ type: 'Identifier', name: x.as }} = ${{ type: 'Identifier', name: x.name }};`);
    program.body = b `
		/* ${banner} */

		"use strict";
		${internal_requires}
		${internal_globals}
		${user_requires}

		${program.body}

		exports.default = ${name};
		${exports}
	`;
}

var Chunk = function Chunk(start, end, content) {
	this.start = start;
	this.end = end;
	this.original = content;

	this.intro = '';
	this.outro = '';

	this.content = content;
	this.storeName = false;
	this.edited = false;

	// we make these non-enumerable, for sanity while debugging
	Object.defineProperties(this, {
		previous: { writable: true, value: null },
		next:     { writable: true, value: null }
	});
};

Chunk.prototype.appendLeft = function appendLeft (content) {
	this.outro += content;
};

Chunk.prototype.appendRight = function appendRight (content) {
	this.intro = this.intro + content;
};

Chunk.prototype.clone = function clone () {
	var chunk = new Chunk(this.start, this.end, this.original);

	chunk.intro = this.intro;
	chunk.outro = this.outro;
	chunk.content = this.content;
	chunk.storeName = this.storeName;
	chunk.edited = this.edited;

	return chunk;
};

Chunk.prototype.contains = function contains (index) {
	return this.start < index && index < this.end;
};

Chunk.prototype.eachNext = function eachNext (fn) {
	var chunk = this;
	while (chunk) {
		fn(chunk);
		chunk = chunk.next;
	}
};

Chunk.prototype.eachPrevious = function eachPrevious (fn) {
	var chunk = this;
	while (chunk) {
		fn(chunk);
		chunk = chunk.previous;
	}
};

Chunk.prototype.edit = function edit (content, storeName, contentOnly) {
	this.content = content;
	if (!contentOnly) {
		this.intro = '';
		this.outro = '';
	}
	this.storeName = storeName;

	this.edited = true;

	return this;
};

Chunk.prototype.prependLeft = function prependLeft (content) {
	this.outro = content + this.outro;
};

Chunk.prototype.prependRight = function prependRight (content) {
	this.intro = content + this.intro;
};

Chunk.prototype.split = function split (index) {
	var sliceIndex = index - this.start;

	var originalBefore = this.original.slice(0, sliceIndex);
	var originalAfter = this.original.slice(sliceIndex);

	this.original = originalBefore;

	var newChunk = new Chunk(index, this.end, originalAfter);
	newChunk.outro = this.outro;
	this.outro = '';

	this.end = index;

	if (this.edited) {
		// TODO is this block necessary?...
		newChunk.edit('', false);
		this.content = '';
	} else {
		this.content = originalBefore;
	}

	newChunk.next = this.next;
	if (newChunk.next) { newChunk.next.previous = newChunk; }
	newChunk.previous = this;
	this.next = newChunk;

	return newChunk;
};

Chunk.prototype.toString = function toString () {
	return this.intro + this.content + this.outro;
};

Chunk.prototype.trimEnd = function trimEnd (rx) {
	this.outro = this.outro.replace(rx, '');
	if (this.outro.length) { return true; }

	var trimmed = this.content.replace(rx, '');

	if (trimmed.length) {
		if (trimmed !== this.content) {
			this.split(this.start + trimmed.length).edit('', undefined, true);
		}
		return true;

	} else {
		this.edit('', undefined, true);

		this.intro = this.intro.replace(rx, '');
		if (this.intro.length) { return true; }
	}
};

Chunk.prototype.trimStart = function trimStart (rx) {
	this.intro = this.intro.replace(rx, '');
	if (this.intro.length) { return true; }

	var trimmed = this.content.replace(rx, '');

	if (trimmed.length) {
		if (trimmed !== this.content) {
			this.split(this.end - trimmed.length);
			this.edit('', undefined, true);
		}
		return true;

	} else {
		this.edit('', undefined, true);

		this.outro = this.outro.replace(rx, '');
		if (this.outro.length) { return true; }
	}
};

var btoa$2 = function () {
	throw new Error('Unsupported environment: `window.btoa` or `Buffer` should be supported.');
};
if (typeof window !== 'undefined' && typeof window.btoa === 'function') {
	btoa$2 = function (str) { return window.btoa(unescape(encodeURIComponent(str))); };
} else if (typeof Buffer === 'function') {
	btoa$2 = function (str) { return Buffer.from(str, 'utf-8').toString('base64'); };
}

var SourceMap$1 = function SourceMap(properties) {
	this.version = 3;
	this.file = properties.file;
	this.sources = properties.sources;
	this.sourcesContent = properties.sourcesContent;
	this.names = properties.names;
	this.mappings = encode(properties.mappings);
};

SourceMap$1.prototype.toString = function toString () {
	return JSON.stringify(this);
};

SourceMap$1.prototype.toUrl = function toUrl () {
	return 'data:application/json;charset=utf-8;base64,' + btoa$2(this.toString());
};

function guessIndent(code) {
	var lines = code.split('\n');

	var tabbed = lines.filter(function (line) { return /^\t+/.test(line); });
	var spaced = lines.filter(function (line) { return /^ {2,}/.test(line); });

	if (tabbed.length === 0 && spaced.length === 0) {
		return null;
	}

	// More lines tabbed than spaced? Assume tabs, and
	// default to tabs in the case of a tie (or nothing
	// to go on)
	if (tabbed.length >= spaced.length) {
		return '\t';
	}

	// Otherwise, we need to guess the multiple
	var min = spaced.reduce(function (previous, current) {
		var numSpaces = /^ +/.exec(current)[0].length;
		return Math.min(numSpaces, previous);
	}, Infinity);

	return new Array(min + 1).join(' ');
}

function getRelativePath(from, to) {
	var fromParts = from.split(/[/\\]/);
	var toParts = to.split(/[/\\]/);

	fromParts.pop(); // get dirname

	while (fromParts[0] === toParts[0]) {
		fromParts.shift();
		toParts.shift();
	}

	if (fromParts.length) {
		var i = fromParts.length;
		while (i--) { fromParts[i] = '..'; }
	}

	return fromParts.concat(toParts).join('/');
}

var toString$1 = Object.prototype.toString;

function isObject(thing) {
	return toString$1.call(thing) === '[object Object]';
}

function getLocator$1(source) {
	var originalLines = source.split('\n');
	var lineOffsets = [];

	for (var i = 0, pos = 0; i < originalLines.length; i++) {
		lineOffsets.push(pos);
		pos += originalLines[i].length + 1;
	}

	return function locate(index) {
		var i = 0;
		var j = lineOffsets.length;
		while (i < j) {
			var m = (i + j) >> 1;
			if (index < lineOffsets[m]) {
				j = m;
			} else {
				i = m + 1;
			}
		}
		var line = i - 1;
		var column = index - lineOffsets[line];
		return { line: line, column: column };
	};
}

var Mappings = function Mappings(hires) {
	this.hires = hires;
	this.generatedCodeLine = 0;
	this.generatedCodeColumn = 0;
	this.raw = [];
	this.rawSegments = this.raw[this.generatedCodeLine] = [];
	this.pending = null;
};

Mappings.prototype.addEdit = function addEdit (sourceIndex, content, loc, nameIndex) {
	if (content.length) {
		var segment = [this.generatedCodeColumn, sourceIndex, loc.line, loc.column];
		if (nameIndex >= 0) {
			segment.push(nameIndex);
		}
		this.rawSegments.push(segment);
	} else if (this.pending) {
		this.rawSegments.push(this.pending);
	}

	this.advance(content);
	this.pending = null;
};

Mappings.prototype.addUneditedChunk = function addUneditedChunk (sourceIndex, chunk, original, loc, sourcemapLocations) {
	var originalCharIndex = chunk.start;
	var first = true;

	while (originalCharIndex < chunk.end) {
		if (this.hires || first || sourcemapLocations[originalCharIndex]) {
			this.rawSegments.push([this.generatedCodeColumn, sourceIndex, loc.line, loc.column]);
		}

		if (original[originalCharIndex] === '\n') {
			loc.line += 1;
			loc.column = 0;
			this.generatedCodeLine += 1;
			this.raw[this.generatedCodeLine] = this.rawSegments = [];
			this.generatedCodeColumn = 0;
		} else {
			loc.column += 1;
			this.generatedCodeColumn += 1;
		}

		originalCharIndex += 1;
		first = false;
	}

	this.pending = [this.generatedCodeColumn, sourceIndex, loc.line, loc.column];
};

Mappings.prototype.advance = function advance (str) {
	if (!str) { return; }

	var lines = str.split('\n');

	if (lines.length > 1) {
		for (var i = 0; i < lines.length - 1; i++) {
			this.generatedCodeLine++;
			this.raw[this.generatedCodeLine] = this.rawSegments = [];
		}
		this.generatedCodeColumn = 0;
	}

	this.generatedCodeColumn += lines[lines.length - 1].length;
};

var n = '\n';

var warned = {
	insertLeft: false,
	insertRight: false,
	storeName: false
};

var MagicString = function MagicString(string, options) {
	if ( options === void 0 ) options = {};

	var chunk = new Chunk(0, string.length, string);

	Object.defineProperties(this, {
		original:              { writable: true, value: string },
		outro:                 { writable: true, value: '' },
		intro:                 { writable: true, value: '' },
		firstChunk:            { writable: true, value: chunk },
		lastChunk:             { writable: true, value: chunk },
		lastSearchedChunk:     { writable: true, value: chunk },
		byStart:               { writable: true, value: {} },
		byEnd:                 { writable: true, value: {} },
		filename:              { writable: true, value: options.filename },
		indentExclusionRanges: { writable: true, value: options.indentExclusionRanges },
		sourcemapLocations:    { writable: true, value: {} },
		storedNames:           { writable: true, value: {} },
		indentStr:             { writable: true, value: guessIndent(string) }
	});

	this.byStart[0] = chunk;
	this.byEnd[string.length] = chunk;
};

MagicString.prototype.addSourcemapLocation = function addSourcemapLocation (char) {
	this.sourcemapLocations[char] = true;
};

MagicString.prototype.append = function append (content) {
	if (typeof content !== 'string') { throw new TypeError('outro content must be a string'); }

	this.outro += content;
	return this;
};

MagicString.prototype.appendLeft = function appendLeft (index, content) {
	if (typeof content !== 'string') { throw new TypeError('inserted content must be a string'); }

	this._split(index);

	var chunk = this.byEnd[index];

	if (chunk) {
		chunk.appendLeft(content);
	} else {
		this.intro += content;
	}
	return this;
};

MagicString.prototype.appendRight = function appendRight (index, content) {
	if (typeof content !== 'string') { throw new TypeError('inserted content must be a string'); }

	this._split(index);

	var chunk = this.byStart[index];

	if (chunk) {
		chunk.appendRight(content);
	} else {
		this.outro += content;
	}
	return this;
};

MagicString.prototype.clone = function clone () {
	var cloned = new MagicString(this.original, { filename: this.filename });

	var originalChunk = this.firstChunk;
	var clonedChunk = (cloned.firstChunk = cloned.lastSearchedChunk = originalChunk.clone());

	while (originalChunk) {
		cloned.byStart[clonedChunk.start] = clonedChunk;
		cloned.byEnd[clonedChunk.end] = clonedChunk;

		var nextOriginalChunk = originalChunk.next;
		var nextClonedChunk = nextOriginalChunk && nextOriginalChunk.clone();

		if (nextClonedChunk) {
			clonedChunk.next = nextClonedChunk;
			nextClonedChunk.previous = clonedChunk;

			clonedChunk = nextClonedChunk;
		}

		originalChunk = nextOriginalChunk;
	}

	cloned.lastChunk = clonedChunk;

	if (this.indentExclusionRanges) {
		cloned.indentExclusionRanges = this.indentExclusionRanges.slice();
	}

	Object.keys(this.sourcemapLocations).forEach(function (loc) {
		cloned.sourcemapLocations[loc] = true;
	});

	return cloned;
};

MagicString.prototype.generateDecodedMap = function generateDecodedMap (options) {
		var this$1 = this;

	options = options || {};

	var sourceIndex = 0;
	var names = Object.keys(this.storedNames);
	var mappings = new Mappings(options.hires);

	var locate = getLocator$1(this.original);

	if (this.intro) {
		mappings.advance(this.intro);
	}

	this.firstChunk.eachNext(function (chunk) {
		var loc = locate(chunk.start);

		if (chunk.intro.length) { mappings.advance(chunk.intro); }

		if (chunk.edited) {
			mappings.addEdit(
				sourceIndex,
				chunk.content,
				loc,
				chunk.storeName ? names.indexOf(chunk.original) : -1
			);
		} else {
			mappings.addUneditedChunk(sourceIndex, chunk, this$1.original, loc, this$1.sourcemapLocations);
		}

		if (chunk.outro.length) { mappings.advance(chunk.outro); }
	});

	return {
		file: options.file ? options.file.split(/[/\\]/).pop() : null,
		sources: [options.source ? getRelativePath(options.file || '', options.source) : null],
		sourcesContent: options.includeContent ? [this.original] : [null],
		names: names,
		mappings: mappings.raw
	};
};

MagicString.prototype.generateMap = function generateMap (options) {
	return new SourceMap$1(this.generateDecodedMap(options));
};

MagicString.prototype.getIndentString = function getIndentString () {
	return this.indentStr === null ? '\t' : this.indentStr;
};

MagicString.prototype.indent = function indent (indentStr, options) {
	var pattern = /^[^\r\n]/gm;

	if (isObject(indentStr)) {
		options = indentStr;
		indentStr = undefined;
	}

	indentStr = indentStr !== undefined ? indentStr : this.indentStr || '\t';

	if (indentStr === '') { return this; } // noop

	options = options || {};

	// Process exclusion ranges
	var isExcluded = {};

	if (options.exclude) {
		var exclusions =
			typeof options.exclude[0] === 'number' ? [options.exclude] : options.exclude;
		exclusions.forEach(function (exclusion) {
			for (var i = exclusion[0]; i < exclusion[1]; i += 1) {
				isExcluded[i] = true;
			}
		});
	}

	var shouldIndentNextCharacter = options.indentStart !== false;
	var replacer = function (match) {
		if (shouldIndentNextCharacter) { return ("" + indentStr + match); }
		shouldIndentNextCharacter = true;
		return match;
	};

	this.intro = this.intro.replace(pattern, replacer);

	var charIndex = 0;
	var chunk = this.firstChunk;

	while (chunk) {
		var end = chunk.end;

		if (chunk.edited) {
			if (!isExcluded[charIndex]) {
				chunk.content = chunk.content.replace(pattern, replacer);

				if (chunk.content.length) {
					shouldIndentNextCharacter = chunk.content[chunk.content.length - 1] === '\n';
				}
			}
		} else {
			charIndex = chunk.start;

			while (charIndex < end) {
				if (!isExcluded[charIndex]) {
					var char = this.original[charIndex];

					if (char === '\n') {
						shouldIndentNextCharacter = true;
					} else if (char !== '\r' && shouldIndentNextCharacter) {
						shouldIndentNextCharacter = false;

						if (charIndex === chunk.start) {
							chunk.prependRight(indentStr);
						} else {
							this._splitChunk(chunk, charIndex);
							chunk = chunk.next;
							chunk.prependRight(indentStr);
						}
					}
				}

				charIndex += 1;
			}
		}

		charIndex = chunk.end;
		chunk = chunk.next;
	}

	this.outro = this.outro.replace(pattern, replacer);

	return this;
};

MagicString.prototype.insert = function insert () {
	throw new Error('magicString.insert(...) is deprecated. Use prependRight(...) or appendLeft(...)');
};

MagicString.prototype.insertLeft = function insertLeft (index, content) {
	if (!warned.insertLeft) {
		console.warn('magicString.insertLeft(...) is deprecated. Use magicString.appendLeft(...) instead'); // eslint-disable-line no-console
		warned.insertLeft = true;
	}

	return this.appendLeft(index, content);
};

MagicString.prototype.insertRight = function insertRight (index, content) {
	if (!warned.insertRight) {
		console.warn('magicString.insertRight(...) is deprecated. Use magicString.prependRight(...) instead'); // eslint-disable-line no-console
		warned.insertRight = true;
	}

	return this.prependRight(index, content);
};

MagicString.prototype.move = function move (start, end, index) {
	if (index >= start && index <= end) { throw new Error('Cannot move a selection inside itself'); }

	this._split(start);
	this._split(end);
	this._split(index);

	var first = this.byStart[start];
	var last = this.byEnd[end];

	var oldLeft = first.previous;
	var oldRight = last.next;

	var newRight = this.byStart[index];
	if (!newRight && last === this.lastChunk) { return this; }
	var newLeft = newRight ? newRight.previous : this.lastChunk;

	if (oldLeft) { oldLeft.next = oldRight; }
	if (oldRight) { oldRight.previous = oldLeft; }

	if (newLeft) { newLeft.next = first; }
	if (newRight) { newRight.previous = last; }

	if (!first.previous) { this.firstChunk = last.next; }
	if (!last.next) {
		this.lastChunk = first.previous;
		this.lastChunk.next = null;
	}

	first.previous = newLeft;
	last.next = newRight || null;

	if (!newLeft) { this.firstChunk = first; }
	if (!newRight) { this.lastChunk = last; }
	return this;
};

MagicString.prototype.overwrite = function overwrite (start, end, content, options) {
	if (typeof content !== 'string') { throw new TypeError('replacement content must be a string'); }

	while (start < 0) { start += this.original.length; }
	while (end < 0) { end += this.original.length; }

	if (end > this.original.length) { throw new Error('end is out of bounds'); }
	if (start === end)
		{ throw new Error('Cannot overwrite a zero-length range – use appendLeft or prependRight instead'); }

	this._split(start);
	this._split(end);

	if (options === true) {
		if (!warned.storeName) {
			console.warn('The final argument to magicString.overwrite(...) should be an options object. See https://github.com/rich-harris/magic-string'); // eslint-disable-line no-console
			warned.storeName = true;
		}

		options = { storeName: true };
	}
	var storeName = options !== undefined ? options.storeName : false;
	var contentOnly = options !== undefined ? options.contentOnly : false;

	if (storeName) {
		var original = this.original.slice(start, end);
		this.storedNames[original] = true;
	}

	var first = this.byStart[start];
	var last = this.byEnd[end];

	if (first) {
		if (end > first.end && first.next !== this.byStart[first.end]) {
			throw new Error('Cannot overwrite across a split point');
		}

		first.edit(content, storeName, contentOnly);

		if (first !== last) {
			var chunk = first.next;
			while (chunk !== last) {
				chunk.edit('', false);
				chunk = chunk.next;
			}

			chunk.edit('', false);
		}
	} else {
		// must be inserting at the end
		var newChunk = new Chunk(start, end, '').edit(content, storeName);

		// TODO last chunk in the array may not be the last chunk, if it's moved...
		last.next = newChunk;
		newChunk.previous = last;
	}
	return this;
};

MagicString.prototype.prepend = function prepend (content) {
	if (typeof content !== 'string') { throw new TypeError('outro content must be a string'); }

	this.intro = content + this.intro;
	return this;
};

MagicString.prototype.prependLeft = function prependLeft (index, content) {
	if (typeof content !== 'string') { throw new TypeError('inserted content must be a string'); }

	this._split(index);

	var chunk = this.byEnd[index];

	if (chunk) {
		chunk.prependLeft(content);
	} else {
		this.intro = content + this.intro;
	}
	return this;
};

MagicString.prototype.prependRight = function prependRight (index, content) {
	if (typeof content !== 'string') { throw new TypeError('inserted content must be a string'); }

	this._split(index);

	var chunk = this.byStart[index];

	if (chunk) {
		chunk.prependRight(content);
	} else {
		this.outro = content + this.outro;
	}
	return this;
};

MagicString.prototype.remove = function remove (start, end) {
	while (start < 0) { start += this.original.length; }
	while (end < 0) { end += this.original.length; }

	if (start === end) { return this; }

	if (start < 0 || end > this.original.length) { throw new Error('Character is out of bounds'); }
	if (start > end) { throw new Error('end must be greater than start'); }

	this._split(start);
	this._split(end);

	var chunk = this.byStart[start];

	while (chunk) {
		chunk.intro = '';
		chunk.outro = '';
		chunk.edit('');

		chunk = end > chunk.end ? this.byStart[chunk.end] : null;
	}
	return this;
};

MagicString.prototype.lastChar = function lastChar () {
	if (this.outro.length)
		{ return this.outro[this.outro.length - 1]; }
	var chunk = this.lastChunk;
	do {
		if (chunk.outro.length)
			{ return chunk.outro[chunk.outro.length - 1]; }
		if (chunk.content.length)
			{ return chunk.content[chunk.content.length - 1]; }
		if (chunk.intro.length)
			{ return chunk.intro[chunk.intro.length - 1]; }
	} while (chunk = chunk.previous);
	if (this.intro.length)
		{ return this.intro[this.intro.length - 1]; }
	return '';
};

MagicString.prototype.lastLine = function lastLine () {
	var lineIndex = this.outro.lastIndexOf(n);
	if (lineIndex !== -1)
		{ return this.outro.substr(lineIndex + 1); }
	var lineStr = this.outro;
	var chunk = this.lastChunk;
	do {
		if (chunk.outro.length > 0) {
			lineIndex = chunk.outro.lastIndexOf(n);
			if (lineIndex !== -1)
				{ return chunk.outro.substr(lineIndex + 1) + lineStr; }
			lineStr = chunk.outro + lineStr;
		}

		if (chunk.content.length > 0) {
			lineIndex = chunk.content.lastIndexOf(n);
			if (lineIndex !== -1)
				{ return chunk.content.substr(lineIndex + 1) + lineStr; }
			lineStr = chunk.content + lineStr;
		}

		if (chunk.intro.length > 0) {
			lineIndex = chunk.intro.lastIndexOf(n);
			if (lineIndex !== -1)
				{ return chunk.intro.substr(lineIndex + 1) + lineStr; }
			lineStr = chunk.intro + lineStr;
		}
	} while (chunk = chunk.previous);
	lineIndex = this.intro.lastIndexOf(n);
	if (lineIndex !== -1)
		{ return this.intro.substr(lineIndex + 1) + lineStr; }
	return this.intro + lineStr;
};

MagicString.prototype.slice = function slice (start, end) {
		if ( start === void 0 ) start = 0;
		if ( end === void 0 ) end = this.original.length;

	while (start < 0) { start += this.original.length; }
	while (end < 0) { end += this.original.length; }

	var result = '';

	// find start chunk
	var chunk = this.firstChunk;
	while (chunk && (chunk.start > start || chunk.end <= start)) {
		// found end chunk before start
		if (chunk.start < end && chunk.end >= end) {
			return result;
		}

		chunk = chunk.next;
	}

	if (chunk && chunk.edited && chunk.start !== start)
		{ throw new Error(("Cannot use replaced character " + start + " as slice start anchor.")); }

	var startChunk = chunk;
	while (chunk) {
		if (chunk.intro && (startChunk !== chunk || chunk.start === start)) {
			result += chunk.intro;
		}

		var containsEnd = chunk.start < end && chunk.end >= end;
		if (containsEnd && chunk.edited && chunk.end !== end)
			{ throw new Error(("Cannot use replaced character " + end + " as slice end anchor.")); }

		var sliceStart = startChunk === chunk ? start - chunk.start : 0;
		var sliceEnd = containsEnd ? chunk.content.length + end - chunk.end : chunk.content.length;

		result += chunk.content.slice(sliceStart, sliceEnd);

		if (chunk.outro && (!containsEnd || chunk.end === end)) {
			result += chunk.outro;
		}

		if (containsEnd) {
			break;
		}

		chunk = chunk.next;
	}

	return result;
};

// TODO deprecate this? not really very useful
MagicString.prototype.snip = function snip (start, end) {
	var clone = this.clone();
	clone.remove(0, start);
	clone.remove(end, clone.original.length);

	return clone;
};

MagicString.prototype._split = function _split (index) {
	if (this.byStart[index] || this.byEnd[index]) { return; }

	var chunk = this.lastSearchedChunk;
	var searchForward = index > chunk.end;

	while (chunk) {
		if (chunk.contains(index)) { return this._splitChunk(chunk, index); }

		chunk = searchForward ? this.byStart[chunk.end] : this.byEnd[chunk.start];
	}
};

MagicString.prototype._splitChunk = function _splitChunk (chunk, index) {
	if (chunk.edited && chunk.content.length) {
		// zero-length edited chunks are a special case (overlapping replacements)
		var loc = getLocator$1(this.original)(index);
		throw new Error(
			("Cannot split a chunk that has already been edited (" + (loc.line) + ":" + (loc.column) + " – \"" + (chunk.original) + "\")")
		);
	}

	var newChunk = chunk.split(index);

	this.byEnd[index] = chunk;
	this.byStart[index] = newChunk;
	this.byEnd[newChunk.end] = newChunk;

	if (chunk === this.lastChunk) { this.lastChunk = newChunk; }

	this.lastSearchedChunk = chunk;
	return true;
};

MagicString.prototype.toString = function toString () {
	var str = this.intro;

	var chunk = this.firstChunk;
	while (chunk) {
		str += chunk.toString();
		chunk = chunk.next;
	}

	return str + this.outro;
};

MagicString.prototype.isEmpty = function isEmpty () {
	var chunk = this.firstChunk;
	do {
		if (chunk.intro.length && chunk.intro.trim() ||
				chunk.content.length && chunk.content.trim() ||
				chunk.outro.length && chunk.outro.trim())
			{ return false; }
	} while (chunk = chunk.next);
	return true;
};

MagicString.prototype.length = function length () {
	var chunk = this.firstChunk;
	var length = 0;
	do {
		length += chunk.intro.length + chunk.content.length + chunk.outro.length;
	} while (chunk = chunk.next);
	return length;
};

MagicString.prototype.trimLines = function trimLines () {
	return this.trim('[\\r\\n]');
};

MagicString.prototype.trim = function trim (charType) {
	return this.trimStart(charType).trimEnd(charType);
};

MagicString.prototype.trimEndAborted = function trimEndAborted (charType) {
	var rx = new RegExp((charType || '\\s') + '+$');

	this.outro = this.outro.replace(rx, '');
	if (this.outro.length) { return true; }

	var chunk = this.lastChunk;

	do {
		var end = chunk.end;
		var aborted = chunk.trimEnd(rx);

		// if chunk was trimmed, we have a new lastChunk
		if (chunk.end !== end) {
			if (this.lastChunk === chunk) {
				this.lastChunk = chunk.next;
			}

			this.byEnd[chunk.end] = chunk;
			this.byStart[chunk.next.start] = chunk.next;
			this.byEnd[chunk.next.end] = chunk.next;
		}

		if (aborted) { return true; }
		chunk = chunk.previous;
	} while (chunk);

	return false;
};

MagicString.prototype.trimEnd = function trimEnd (charType) {
	this.trimEndAborted(charType);
	return this;
};
MagicString.prototype.trimStartAborted = function trimStartAborted (charType) {
	var rx = new RegExp('^' + (charType || '\\s') + '+');

	this.intro = this.intro.replace(rx, '');
	if (this.intro.length) { return true; }

	var chunk = this.firstChunk;

	do {
		var end = chunk.end;
		var aborted = chunk.trimStart(rx);

		if (chunk.end !== end) {
			// special case...
			if (chunk === this.lastChunk) { this.lastChunk = chunk.next; }

			this.byEnd[chunk.end] = chunk;
			this.byStart[chunk.next.start] = chunk.next;
			this.byEnd[chunk.next.end] = chunk.next;
		}

		if (aborted) { return true; }
		chunk = chunk.next;
	} while (chunk);

	return false;
};

MagicString.prototype.trimStart = function trimStart (charType) {
	this.trimStartAborted(charType);
	return this;
};

const UNKNOWN = {};
function gather_possible_values(node, set) {
    if (node.type === 'Literal') {
        set.add(node.value);
    }
    else if (node.type === 'ConditionalExpression') {
        gather_possible_values(node.consequent, set);
        gather_possible_values(node.alternate, set);
    }
    else {
        set.add(UNKNOWN);
    }
}

var BlockAppliesToNode;
(function (BlockAppliesToNode) {
    BlockAppliesToNode[BlockAppliesToNode["NotPossible"] = 0] = "NotPossible";
    BlockAppliesToNode[BlockAppliesToNode["Possible"] = 1] = "Possible";
    BlockAppliesToNode[BlockAppliesToNode["UnknownSelectorType"] = 2] = "UnknownSelectorType";
})(BlockAppliesToNode || (BlockAppliesToNode = {}));
var NodeExist;
(function (NodeExist) {
    NodeExist[NodeExist["Probably"] = 1] = "Probably";
    NodeExist[NodeExist["Definitely"] = 2] = "Definitely";
})(NodeExist || (NodeExist = {}));
const whitelist_attribute_selector = new Map([
    ['details', new Set(['open'])]
]);
class Selector$1 {
    constructor(node, stylesheet) {
        this.node = node;
        this.stylesheet = stylesheet;
        this.blocks = group_selectors(node);
        // take trailing :global(...) selectors out of consideration
        let i = this.blocks.length;
        while (i > 0) {
            if (!this.blocks[i - 1].global)
                break;
            i -= 1;
        }
        this.local_blocks = this.blocks.slice(0, i);
        const host_only = this.blocks.length === 1 && this.blocks[0].host;
        this.used = this.local_blocks.length === 0 || host_only;
    }
    apply(node) {
        const to_encapsulate = [];
        apply_selector(this.local_blocks.slice(), node, to_encapsulate);
        if (to_encapsulate.length > 0) {
            to_encapsulate.forEach(({ node, block }) => {
                this.stylesheet.nodes_with_css_class.add(node);
                block.should_encapsulate = true;
            });
            this.used = true;
        }
    }
    minify(code) {
        let c = null;
        this.blocks.forEach((block, i) => {
            if (i > 0) {
                if (block.start - c > 1) {
                    code.overwrite(c, block.start, block.combinator.name || ' ');
                }
            }
            c = block.end;
        });
    }
    transform(code, attr, max_amount_class_specificity_increased) {
        const amount_class_specificity_to_increase = max_amount_class_specificity_increased - this.blocks.filter(block => block.should_encapsulate).length;
        function encapsulate_block(block, attr) {
            let i = block.selectors.length;
            while (i--) {
                const selector = block.selectors[i];
                if (selector.type === 'PseudoElementSelector' || selector.type === 'PseudoClassSelector') {
                    if (selector.name !== 'root' && selector.name !== 'host') {
                        if (i === 0)
                            code.prependRight(selector.start, attr);
                    }
                    continue;
                }
                if (selector.type === 'TypeSelector' && selector.name === '*') {
                    code.overwrite(selector.start, selector.end, attr);
                }
                else {
                    code.appendLeft(selector.end, attr);
                }
                break;
            }
        }
        this.blocks.forEach((block, index) => {
            if (block.global) {
                const selector = block.selectors[0];
                const first = selector.children[0];
                const last = selector.children[selector.children.length - 1];
                code.remove(selector.start, first.start).remove(last.end, selector.end);
            }
            if (block.should_encapsulate)
                encapsulate_block(block, index === this.blocks.length - 1 ? attr.repeat(amount_class_specificity_to_increase + 1) : attr);
        });
    }
    validate(component) {
        this.blocks.forEach((block) => {
            let i = block.selectors.length;
            while (i-- > 1) {
                const selector = block.selectors[i];
                if (selector.type === 'PseudoClassSelector' && selector.name === 'global') {
                    component.error(selector, {
                        code: 'css-invalid-global',
                        message: ':global(...) must be the first element in a compound selector'
                    });
                }
            }
        });
        let start = 0;
        let end = this.blocks.length;
        for (; start < end; start += 1) {
            if (!this.blocks[start].global)
                break;
        }
        for (; end > start; end -= 1) {
            if (!this.blocks[end - 1].global)
                break;
        }
        for (let i = start; i < end; i += 1) {
            if (this.blocks[i].global) {
                component.error(this.blocks[i].selectors[0], {
                    code: 'css-invalid-global',
                    message: ':global(...) can be at the start or end of a selector sequence, but not in the middle'
                });
            }
        }
    }
    get_amount_class_specificity_increased() {
        let count = 0;
        for (const block of this.blocks) {
            if (block.should_encapsulate) {
                count++;
            }
        }
        return count;
    }
}
function apply_selector(blocks, node, to_encapsulate) {
    const block = blocks.pop();
    if (!block)
        return false;
    if (!node) {
        return ((block.global && blocks.every(block => block.global)) ||
            (block.host && blocks.length === 0));
    }
    switch (block_might_apply_to_node(block, node)) {
        case BlockAppliesToNode.NotPossible:
            return false;
        case BlockAppliesToNode.UnknownSelectorType:
            // bail. TODO figure out what these could be
            to_encapsulate.push({ node, block });
            return true;
    }
    if (block.combinator) {
        if (block.combinator.type === 'WhiteSpace') {
            for (const ancestor_block of blocks) {
                if (ancestor_block.global) {
                    continue;
                }
                if (ancestor_block.host) {
                    to_encapsulate.push({ node, block });
                    return true;
                }
                let parent = node;
                while (parent = get_element_parent(parent)) {
                    if (block_might_apply_to_node(ancestor_block, parent) !== BlockAppliesToNode.NotPossible) {
                        to_encapsulate.push({ node: parent, block: ancestor_block });
                    }
                }
                if (to_encapsulate.length) {
                    to_encapsulate.push({ node, block });
                    return true;
                }
            }
            if (blocks.every(block => block.global)) {
                to_encapsulate.push({ node, block });
                return true;
            }
            return false;
        }
        else if (block.combinator.name === '>') {
            if (apply_selector(blocks, get_element_parent(node), to_encapsulate)) {
                to_encapsulate.push({ node, block });
                return true;
            }
            return false;
        }
        else if (block.combinator.name === '+' || block.combinator.name === '~') {
            const siblings = get_possible_element_siblings(node, block.combinator.name === '+');
            let has_match = false;
            // NOTE: if we have :global(), we couldn't figure out what is selected within `:global` due to the 
            // css-tree limitation that does not parse the inner selector of :global
            // so unless we are sure there will be no sibling to match, we will consider it as matched
            const has_global = blocks.some(block => block.global);
            if (has_global) {
                if (siblings.size === 0 && get_element_parent(node) !== null) {
                    return false;
                }
                to_encapsulate.push({ node, block });
                return true;
            }
            for (const possible_sibling of siblings.keys()) {
                if (apply_selector(blocks.slice(), possible_sibling, to_encapsulate)) {
                    to_encapsulate.push({ node, block });
                    has_match = true;
                }
            }
            return has_match;
        }
        // TODO other combinators
        to_encapsulate.push({ node, block });
        return true;
    }
    to_encapsulate.push({ node, block });
    return true;
}
function block_might_apply_to_node(block, node) {
    let i = block.selectors.length;
    while (i--) {
        const selector = block.selectors[i];
        const name = typeof selector.name === 'string' && selector.name.replace(/\\(.)/g, '$1');
        if (selector.type === 'PseudoClassSelector' && name === 'host') {
            return BlockAppliesToNode.NotPossible;
        }
        if (selector.type === 'PseudoClassSelector' || selector.type === 'PseudoElementSelector') {
            continue;
        }
        if (selector.type === 'PseudoClassSelector' && name === 'global') {
            // TODO shouldn't see this here... maybe we should enforce that :global(...)
            // cannot be sandwiched between non-global selectors?
            return BlockAppliesToNode.NotPossible;
        }
        if (selector.type === 'ClassSelector') {
            if (!attribute_matches(node, 'class', name, '~=', false) && !node.classes.some(c => c.name === name))
                return BlockAppliesToNode.NotPossible;
        }
        else if (selector.type === 'IdSelector') {
            if (!attribute_matches(node, 'id', name, '=', false))
                return BlockAppliesToNode.NotPossible;
        }
        else if (selector.type === 'AttributeSelector') {
            if (!(whitelist_attribute_selector.has(node.name.toLowerCase()) && whitelist_attribute_selector.get(node.name.toLowerCase()).has(selector.name.name.toLowerCase())) &&
                !attribute_matches(node, selector.name.name, selector.value && unquote(selector.value), selector.matcher, selector.flags)) {
                return BlockAppliesToNode.NotPossible;
            }
        }
        else if (selector.type === 'TypeSelector') {
            if (node.name.toLowerCase() !== name.toLowerCase() && name !== '*')
                return BlockAppliesToNode.NotPossible;
        }
        else {
            return BlockAppliesToNode.UnknownSelectorType;
        }
    }
    return BlockAppliesToNode.Possible;
}
function test_attribute(operator, expected_value, case_insensitive, value) {
    if (case_insensitive) {
        expected_value = expected_value.toLowerCase();
        value = value.toLowerCase();
    }
    switch (operator) {
        case '=': return value === expected_value;
        case '~=': return value.split(/\s/).includes(expected_value);
        case '|=': return `${value}-`.startsWith(`${expected_value}-`);
        case '^=': return value.startsWith(expected_value);
        case '$=': return value.endsWith(expected_value);
        case '*=': return value.includes(expected_value);
        default: throw new Error("this shouldn't happen");
    }
}
function attribute_matches(node, name, expected_value, operator, case_insensitive) {
    const spread = node.attributes.find(attr => attr.type === 'Spread');
    if (spread)
        return true;
    if (node.bindings.some((binding) => binding.name === name))
        return true;
    const attr = node.attributes.find((attr) => attr.name === name);
    if (!attr)
        return false;
    if (attr.is_true)
        return operator === null;
    if (!expected_value)
        return true;
    if (attr.chunks.length === 1) {
        const value = attr.chunks[0];
        if (!value)
            return false;
        if (value.type === 'Text')
            return test_attribute(operator, expected_value, case_insensitive, value.data);
    }
    const possible_values = new Set();
    let prev_values = [];
    for (const chunk of attr.chunks) {
        const current_possible_values = new Set();
        if (chunk.type === 'Text') {
            current_possible_values.add(chunk.data);
        }
        else {
            gather_possible_values(chunk.node, current_possible_values);
        }
        // impossible to find out all combinations
        if (current_possible_values.has(UNKNOWN))
            return true;
        if (prev_values.length > 0) {
            const start_with_space = [];
            const remaining = [];
            current_possible_values.forEach((current_possible_value) => {
                if (/^\s/.test(current_possible_value)) {
                    start_with_space.push(current_possible_value);
                }
                else {
                    remaining.push(current_possible_value);
                }
            });
            if (remaining.length > 0) {
                if (start_with_space.length > 0) {
                    prev_values.forEach(prev_value => possible_values.add(prev_value));
                }
                const combined = [];
                prev_values.forEach((prev_value) => {
                    remaining.forEach((value) => {
                        combined.push(prev_value + value);
                    });
                });
                prev_values = combined;
                start_with_space.forEach((value) => {
                    if (/\s$/.test(value)) {
                        possible_values.add(value);
                    }
                    else {
                        prev_values.push(value);
                    }
                });
                continue;
            }
            else {
                prev_values.forEach(prev_value => possible_values.add(prev_value));
                prev_values = [];
            }
        }
        current_possible_values.forEach((current_possible_value) => {
            if (/\s$/.test(current_possible_value)) {
                possible_values.add(current_possible_value);
            }
            else {
                prev_values.push(current_possible_value);
            }
        });
        if (prev_values.length < current_possible_values.size) {
            prev_values.push(' ');
        }
        if (prev_values.length > 20) {
            // might grow exponentially, bail out
            return true;
        }
    }
    prev_values.forEach(prev_value => possible_values.add(prev_value));
    if (possible_values.has(UNKNOWN))
        return true;
    for (const value of possible_values) {
        if (test_attribute(operator, expected_value, case_insensitive, value))
            return true;
    }
    return false;
}
function unquote(value) {
    if (value.type === 'Identifier')
        return value.name;
    const str = value.value;
    if (str[0] === str[str.length - 1] && str[0] === "'" || str[0] === '"') {
        return str.slice(1, str.length - 1);
    }
    return str;
}
function get_element_parent(node) {
    let parent = node;
    while ((parent = parent.parent) && parent.type !== 'Element')
        ;
    return parent;
}
function get_possible_element_siblings(node, adjacent_only) {
    const result = new Map();
    let prev = node;
    while (prev = prev.prev) {
        if (prev.type === 'Element') {
            if (!prev.attributes.find(attr => attr.type === 'Attribute' && attr.name.toLowerCase() === 'slot')) {
                result.set(prev, NodeExist.Definitely);
            }
            if (adjacent_only) {
                break;
            }
        }
        else if (prev.type === 'EachBlock' || prev.type === 'IfBlock' || prev.type === 'AwaitBlock') {
            const possible_last_child = get_possible_last_child(prev, adjacent_only);
            add_to_map(possible_last_child, result);
            if (adjacent_only && has_definite_elements(possible_last_child)) {
                return result;
            }
        }
    }
    if (!prev || !adjacent_only) {
        let parent = node;
        let skip_each_for_last_child = node.type === 'ElseBlock';
        while ((parent = parent.parent) && (parent.type === 'EachBlock' || parent.type === 'IfBlock' || parent.type === 'ElseBlock' || parent.type === 'AwaitBlock')) {
            const possible_siblings = get_possible_element_siblings(parent, adjacent_only);
            add_to_map(possible_siblings, result);
            if (parent.type === 'EachBlock') {
                // first child of each block can select the last child of each block as previous sibling
                if (skip_each_for_last_child) {
                    skip_each_for_last_child = false;
                }
                else {
                    add_to_map(get_possible_last_child(parent, adjacent_only), result);
                }
            }
            else if (parent.type === 'ElseBlock') {
                skip_each_for_last_child = true;
                parent = parent.parent;
            }
            if (adjacent_only && has_definite_elements(possible_siblings)) {
                break;
            }
        }
    }
    return result;
}
function get_possible_last_child(block, adjacent_only) {
    const result = new Map();
    if (block.type === 'EachBlock') {
        const each_result = loop_child(block.children, adjacent_only);
        const else_result = block.else ? loop_child(block.else.children, adjacent_only) : new Map();
        const not_exhaustive = !has_definite_elements(else_result);
        if (not_exhaustive) {
            mark_as_probably(each_result);
            mark_as_probably(else_result);
        }
        add_to_map(each_result, result);
        add_to_map(else_result, result);
    }
    else if (block.type === 'IfBlock') {
        const if_result = loop_child(block.children, adjacent_only);
        const else_result = block.else ? loop_child(block.else.children, adjacent_only) : new Map();
        const not_exhaustive = !has_definite_elements(if_result) || !has_definite_elements(else_result);
        if (not_exhaustive) {
            mark_as_probably(if_result);
            mark_as_probably(else_result);
        }
        add_to_map(if_result, result);
        add_to_map(else_result, result);
    }
    else if (block.type === 'AwaitBlock') {
        const pending_result = block.pending ? loop_child(block.pending.children, adjacent_only) : new Map();
        const then_result = block.then ? loop_child(block.then.children, adjacent_only) : new Map();
        const catch_result = block.catch ? loop_child(block.catch.children, adjacent_only) : new Map();
        const not_exhaustive = !has_definite_elements(pending_result) || !has_definite_elements(then_result) || !has_definite_elements(catch_result);
        if (not_exhaustive) {
            mark_as_probably(pending_result);
            mark_as_probably(then_result);
            mark_as_probably(catch_result);
        }
        add_to_map(pending_result, result);
        add_to_map(then_result, result);
        add_to_map(catch_result, result);
    }
    return result;
}
function has_definite_elements(result) {
    if (result.size === 0)
        return false;
    for (const exist of result.values()) {
        if (exist === NodeExist.Definitely) {
            return true;
        }
    }
    return false;
}
function add_to_map(from, to) {
    from.forEach((exist, element) => {
        to.set(element, higher_existance(exist, to.get(element)));
    });
}
function higher_existance(exist1, exist2) {
    if (exist1 === undefined || exist2 === undefined)
        return exist1 || exist2;
    return exist1 > exist2 ? exist1 : exist2;
}
function mark_as_probably(result) {
    for (const key of result.keys()) {
        result.set(key, NodeExist.Probably);
    }
}
function loop_child(children, adjacent_only) {
    const result = new Map();
    for (let i = children.length - 1; i >= 0; i--) {
        const child = children[i];
        if (child.type === 'Element') {
            result.set(child, NodeExist.Definitely);
            if (adjacent_only) {
                break;
            }
        }
        else if (child.type === 'EachBlock' || child.type === 'IfBlock' || child.type === 'AwaitBlock') {
            const child_result = get_possible_last_child(child, adjacent_only);
            add_to_map(child_result, result);
            if (adjacent_only && has_definite_elements(child_result)) {
                break;
            }
        }
    }
    return result;
}
class Block$2 {
    constructor(combinator) {
        this.combinator = combinator;
        this.global = false;
        this.host = false;
        this.selectors = [];
        this.start = null;
        this.end = null;
        this.should_encapsulate = false;
    }
    add(selector) {
        if (this.selectors.length === 0) {
            this.start = selector.start;
            this.global = selector.type === 'PseudoClassSelector' && selector.name === 'global';
            this.host = selector.type === 'PseudoClassSelector' && selector.name === 'host';
        }
        this.selectors.push(selector);
        this.end = selector.end;
    }
}
function group_selectors(selector) {
    let block = new Block$2(null);
    const blocks = [block];
    selector.children.forEach((child) => {
        if (child.type === 'WhiteSpace' || child.type === 'Combinator') {
            block = new Block$2(child);
            blocks.push(block);
        }
        else {
            block.add(child);
        }
    });
    return blocks;
}

function remove_css_prefix(name) {
    return name.replace(/^-((webkit)|(moz)|(o)|(ms))-/, '');
}
const is_keyframes_node = (node) => remove_css_prefix(node.name) === 'keyframes';
const at_rule_has_declaration = ({ block }) => block &&
    block.children &&
    block.children.find((node) => node.type === 'Declaration');
function minify_declarations(code, start, declarations) {
    let c = start;
    declarations.forEach((declaration, i) => {
        const separator = i > 0 ? ';' : '';
        if ((declaration.node.start - c) > separator.length) {
            code.overwrite(c, declaration.node.start, separator);
        }
        declaration.minify(code);
        c = declaration.node.end;
    });
    return c;
}
class Rule$1 {
    constructor(node, stylesheet, parent) {
        this.node = node;
        this.parent = parent;
        this.selectors = node.prelude.children.map((node) => new Selector$1(node, stylesheet));
        this.declarations = node.block.children.map((node) => new Declaration$1(node));
    }
    apply(node) {
        this.selectors.forEach(selector => selector.apply(node)); // TODO move the logic in here?
    }
    is_used(dev) {
        if (this.parent && this.parent.node.type === 'Atrule' && is_keyframes_node(this.parent.node))
            return true;
        if (this.declarations.length === 0)
            return dev;
        return this.selectors.some(s => s.used);
    }
    minify(code, _dev) {
        let c = this.node.start;
        let started = false;
        this.selectors.forEach((selector) => {
            if (selector.used) {
                const separator = started ? ',' : '';
                if ((selector.node.start - c) > separator.length) {
                    code.overwrite(c, selector.node.start, separator);
                }
                selector.minify(code);
                c = selector.node.end;
                started = true;
            }
        });
        code.remove(c, this.node.block.start);
        c = this.node.block.start + 1;
        c = minify_declarations(code, c, this.declarations);
        code.remove(c, this.node.block.end - 1);
    }
    transform(code, id, keyframes, max_amount_class_specificity_increased) {
        if (this.parent && this.parent.node.type === 'Atrule' && is_keyframes_node(this.parent.node))
            return true;
        const attr = `.${id}`;
        this.selectors.forEach(selector => selector.transform(code, attr, max_amount_class_specificity_increased));
        this.declarations.forEach(declaration => declaration.transform(code, keyframes));
    }
    validate(component) {
        this.selectors.forEach(selector => {
            selector.validate(component);
        });
    }
    warn_on_unused_selector(handler) {
        this.selectors.forEach(selector => {
            if (!selector.used)
                handler(selector);
        });
    }
    get_max_amount_class_specificity_increased() {
        return Math.max(...this.selectors.map(selector => selector.get_amount_class_specificity_increased()));
    }
}
class Declaration$1 {
    constructor(node) {
        this.node = node;
    }
    transform(code, keyframes) {
        const property = this.node.property && remove_css_prefix(this.node.property.toLowerCase());
        if (property === 'animation' || property === 'animation-name') {
            this.node.value.children.forEach((block) => {
                if (block.type === 'Identifier') {
                    const name = block.name;
                    if (keyframes.has(name)) {
                        code.overwrite(block.start, block.end, keyframes.get(name));
                    }
                }
            });
        }
    }
    minify(code) {
        if (!this.node.property)
            return; // @apply, and possibly other weird cases?
        const c = this.node.start + this.node.property.length;
        const first = this.node.value.children
            ? this.node.value.children[0]
            : this.node.value;
        let start = first.start;
        while (/\s/.test(code.original[start]))
            start += 1;
        if (start - c > 1) {
            code.overwrite(c, start, ':');
        }
    }
}
class Atrule$1 {
    constructor(node) {
        this.node = node;
        this.children = [];
        this.declarations = [];
    }
    apply(node) {
        if (this.node.name === 'media' || this.node.name === 'supports') {
            this.children.forEach(child => {
                child.apply(node);
            });
        }
        else if (is_keyframes_node(this.node)) {
            this.children.forEach((rule) => {
                rule.selectors.forEach(selector => {
                    selector.used = true;
                });
            });
        }
    }
    is_used(_dev) {
        return true; // TODO
    }
    minify(code, dev) {
        if (this.node.name === 'media') {
            const expression_char = code.original[this.node.prelude.start];
            let c = this.node.start + (expression_char === '(' ? 6 : 7);
            if (this.node.prelude.start > c)
                code.remove(c, this.node.prelude.start);
            this.node.prelude.children.forEach((query) => {
                // TODO minify queries
                c = query.end;
            });
            code.remove(c, this.node.block.start);
        }
        else if (this.node.name === 'supports') {
            let c = this.node.start + 9;
            if (this.node.prelude.start - c > 1)
                code.overwrite(c, this.node.prelude.start, ' ');
            this.node.prelude.children.forEach((query) => {
                // TODO minify queries
                c = query.end;
            });
            code.remove(c, this.node.block.start);
        }
        else {
            let c = this.node.start + this.node.name.length + 1;
            if (this.node.prelude) {
                if (this.node.prelude.start - c > 1)
                    code.overwrite(c, this.node.prelude.start, ' ');
                c = this.node.prelude.end;
            }
            if (this.node.block && this.node.block.start - c > 0) {
                code.remove(c, this.node.block.start);
            }
        }
        // TODO other atrules
        if (this.node.block) {
            let c = this.node.block.start + 1;
            if (this.declarations.length) {
                c = minify_declarations(code, c, this.declarations);
                // if the atrule has children, leave the last declaration semicolon alone
                if (this.children.length)
                    c++;
            }
            this.children.forEach(child => {
                if (child.is_used(dev)) {
                    code.remove(c, child.node.start);
                    child.minify(code, dev);
                    c = child.node.end;
                }
            });
            code.remove(c, this.node.block.end - 1);
        }
    }
    transform(code, id, keyframes, max_amount_class_specificity_increased) {
        if (is_keyframes_node(this.node)) {
            this.node.prelude.children.forEach(({ type, name, start, end }) => {
                if (type === 'Identifier') {
                    if (name.startsWith('-global-')) {
                        code.remove(start, start + 8);
                        this.children.forEach((rule) => {
                            rule.selectors.forEach(selector => {
                                selector.used = true;
                            });
                        });
                    }
                    else {
                        code.overwrite(start, end, keyframes.get(name));
                    }
                }
            });
        }
        this.children.forEach(child => {
            child.transform(code, id, keyframes, max_amount_class_specificity_increased);
        });
    }
    validate(component) {
        this.children.forEach(child => {
            child.validate(component);
        });
    }
    warn_on_unused_selector(handler) {
        if (this.node.name !== 'media')
            return;
        this.children.forEach(child => {
            child.warn_on_unused_selector(handler);
        });
    }
    get_max_amount_class_specificity_increased() {
        return Math.max(...this.children.map(rule => rule.get_max_amount_class_specificity_increased()));
    }
}
const get_default_css_hash = ({ css, hash }) => {
    return `svelte-${hash(css)}`;
};
class Stylesheet {
    constructor({ source, ast, component_name, filename, dev, get_css_hash = get_default_css_hash }) {
        this.children = [];
        this.keyframes = new Map();
        this.nodes_with_css_class = new Set();
        this.source = source;
        this.ast = ast;
        this.filename = filename;
        this.dev = dev;
        if (ast.css && ast.css.children.length) {
            this.id = get_css_hash({
                filename,
                name: component_name,
                css: ast.css.content.styles,
                hash
            });
            this.has_styles = true;
            const stack = [];
            let depth = 0;
            let current_atrule = null;
            walk(ast.css, {
                enter: (node) => {
                    if (node.type === 'Atrule') {
                        const atrule = new Atrule$1(node);
                        stack.push(atrule);
                        if (current_atrule) {
                            current_atrule.children.push(atrule);
                        }
                        else if (depth <= 1) {
                            this.children.push(atrule);
                        }
                        if (is_keyframes_node(node)) {
                            node.prelude.children.forEach((expression) => {
                                if (expression.type === 'Identifier' && !expression.name.startsWith('-global-')) {
                                    this.keyframes.set(expression.name, `${this.id}-${expression.name}`);
                                }
                            });
                        }
                        else if (at_rule_has_declaration(node)) {
                            const at_rule_declarations = node.block.children
                                .filter(node => node.type === 'Declaration')
                                .map(node => new Declaration$1(node));
                            atrule.declarations.push(...at_rule_declarations);
                        }
                        current_atrule = atrule;
                    }
                    if (node.type === 'Rule') {
                        const rule = new Rule$1(node, this, current_atrule);
                        if (current_atrule) {
                            current_atrule.children.push(rule);
                        }
                        else if (depth <= 1) {
                            this.children.push(rule);
                        }
                    }
                    depth += 1;
                },
                leave: (node) => {
                    if (node.type === 'Atrule') {
                        stack.pop();
                        current_atrule = stack[stack.length - 1];
                    }
                    depth -= 1;
                }
            });
        }
        else {
            this.has_styles = false;
        }
    }
    apply(node) {
        if (!this.has_styles)
            return;
        for (let i = 0; i < this.children.length; i += 1) {
            const child = this.children[i];
            child.apply(node);
        }
    }
    reify() {
        this.nodes_with_css_class.forEach((node) => {
            node.add_css_class();
        });
    }
    render(file, should_transform_selectors) {
        if (!this.has_styles) {
            return { code: null, map: null };
        }
        const code = new MagicString(this.source);
        walk(this.ast.css, {
            enter: (node) => {
                code.addSourcemapLocation(node.start);
                code.addSourcemapLocation(node.end);
            }
        });
        if (should_transform_selectors) {
            const max = Math.max(...this.children.map(rule => rule.get_max_amount_class_specificity_increased()));
            this.children.forEach((child) => {
                child.transform(code, this.id, this.keyframes, max);
            });
        }
        let c = 0;
        this.children.forEach(child => {
            if (child.is_used(this.dev)) {
                code.remove(c, child.node.start);
                child.minify(code, this.dev);
                c = child.node.end;
            }
        });
        code.remove(c, this.source.length);
        return {
            code: code.toString(),
            map: code.generateMap({
                includeContent: true,
                source: this.filename,
                file
            })
        };
    }
    validate(component) {
        this.children.forEach(child => {
            child.validate(component);
        });
    }
    warn_on_unused_selectors(component) {
        this.children.forEach(child => {
            child.warn_on_unused_selector((selector) => {
                component.warn(selector.node, {
                    code: 'css-unused-selector',
                    message: `Unused CSS selector "${this.source.slice(selector.node.start, selector.node.end)}"`
                });
            });
        });
    }
}

const test = typeof process !== 'undefined' && process.env.TEST;

class TemplateScope {
    constructor(parent) {
        this.owners = new Map();
        this.parent = parent;
        this.names = new Set(parent ? parent.names : []);
        this.dependencies_for_name = new Map(parent ? parent.dependencies_for_name : []);
    }
    add(name, dependencies, owner) {
        this.names.add(name);
        this.dependencies_for_name.set(name, dependencies);
        this.owners.set(name, owner);
        return this;
    }
    child() {
        const child = new TemplateScope(this);
        return child;
    }
    is_top_level(name) {
        return !this.parent || !this.names.has(name) && this.parent.is_top_level(name);
    }
    get_owner(name) {
        return this.owners.get(name) || (this.parent && this.parent.get_owner(name));
    }
    is_let(name) {
        const owner = this.get_owner(name);
        return owner && (owner.type === 'Element' || owner.type === 'InlineComponent' || owner.type === 'SlotTemplate');
    }
    is_await(name) {
        const owner = this.get_owner(name);
        return owner && (owner.type === 'ThenBlock' || owner.type === 'CatchBlock');
    }
}

class Fragment extends Node$1 {
    constructor(component, info) {
        const scope = new TemplateScope();
        super(component, null, scope, info);
        this.scope = scope;
        this.children = map_children(component, this, scope, info.children);
    }
}

// This file is automatically generated
var internal_exports = new Set(["HtmlTag", "SvelteComponent", "SvelteComponentDev", "SvelteComponentTyped", "SvelteElement", "action_destroyer", "add_attribute", "add_classes", "add_flush_callback", "add_location", "add_render_callback", "add_resize_listener", "add_transform", "afterUpdate", "append", "append_dev", "assign", "attr", "attr_dev", "attribute_to_object", "beforeUpdate", "bind", "binding_callbacks", "blank_object", "bubble", "check_outros", "children", "claim_component", "claim_element", "claim_space", "claim_text", "clear_loops", "component_subscribe", "compute_rest_props", "compute_slots", "createEventDispatcher", "create_animation", "create_bidirectional_transition", "create_component", "create_in_transition", "create_out_transition", "create_slot", "create_ssr_component", "current_component", "custom_event", "dataset_dev", "debug", "destroy_block", "destroy_component", "destroy_each", "detach", "detach_after_dev", "detach_before_dev", "detach_between_dev", "detach_dev", "dirty_components", "dispatch_dev", "each", "element", "element_is", "empty", "escape", "escaped", "exclude_internal_props", "fix_and_destroy_block", "fix_and_outro_and_destroy_block", "fix_position", "flush", "getContext", "get_binding_group_value", "get_current_component", "get_custom_elements_slots", "get_slot_changes", "get_slot_context", "get_spread_object", "get_spread_update", "get_store_value", "globals", "group_outros", "handle_promise", "hasContext", "has_prop", "identity", "init", "insert", "insert_dev", "intros", "invalid_attribute_name_character", "is_client", "is_crossorigin", "is_empty", "is_function", "is_promise", "listen", "listen_dev", "loop", "loop_guard", "missing_component", "mount_component", "noop", "not_equal", "now", "null_to_empty", "object_without_properties", "onDestroy", "onMount", "once", "outro_and_destroy_block", "prevent_default", "prop_dev", "query_selector_all", "raf", "run", "run_all", "safe_not_equal", "schedule_update", "select_multiple_value", "select_option", "select_options", "select_value", "self", "setContext", "set_attributes", "set_current_component", "set_custom_element_data", "set_data", "set_data_dev", "set_input_type", "set_input_value", "set_now", "set_raf", "set_store_value", "set_style", "set_svg_attributes", "space", "spread", "stop_propagation", "subscribe", "svg_element", "text", "tick", "time_ranges_to_array", "to_number", "toggle_class", "transition_in", "transition_out", "update_keyed_each", "update_slot", "update_slot_spread", "validate_component", "validate_each_argument", "validate_each_keys", "validate_slots", "validate_store", "xlink_attr"]);

function is_used_as_reference(node, parent) {
    if (!isReference(node, parent)) {
        return false;
    }
    if (!parent) {
        return true;
    }
    /* eslint-disable no-fallthrough */
    switch (parent.type) {
        // disregard the `foo` in `const foo = bar`
        case 'VariableDeclarator':
            return node !== parent.id;
        // disregard the `foo`, `bar` in `function foo(bar){}`
        case 'FunctionDeclaration':
        // disregard the `foo` in `import { foo } from 'foo'`
        case 'ImportSpecifier':
        // disregard the `foo` in `import foo from 'foo'`
        case 'ImportDefaultSpecifier':
        // disregard the `foo` in `import * as foo from 'foo'`
        case 'ImportNamespaceSpecifier':
        // disregard the `foo` in `export { foo }`
        case 'ExportSpecifier':
            return false;
        default:
            return true;
    }
}

function check_graph_for_cycles(edges) {
    const graph = edges.reduce((g, edge) => {
        const [u, v] = edge;
        if (!g.has(u))
            g.set(u, []);
        if (!g.has(v))
            g.set(v, []);
        g.get(u).push(v);
        return g;
    }, new Map());
    const visited = new Set();
    const on_stack = new Set();
    const cycles = [];
    function visit(v) {
        visited.add(v);
        on_stack.add(v);
        graph.get(v).forEach(w => {
            if (!visited.has(w)) {
                visit(w);
            }
            else if (on_stack.has(w)) {
                cycles.push([...on_stack, w]);
            }
        });
        on_stack.delete(v);
    }
    graph.forEach((_, v) => {
        if (!visited.has(v)) {
            visit(v);
        }
    });
    return cycles[0];
}

class Component {
    constructor(ast, source, name, compile_options, stats, warnings) {
        this.ignore_stack = [];
        this.vars = [];
        this.var_lookup = new Map();
        this.imports = [];
        this.hoistable_nodes = new Set();
        this.node_for_declaration = new Map();
        this.partly_hoisted = [];
        this.fully_hoisted = [];
        this.reactive_declarations = [];
        this.reactive_declaration_nodes = new Set();
        this.has_reactive_assignments = false;
        this.injected_reactive_declaration_vars = new Set();
        this.helpers = new Map();
        this.globals = new Map();
        this.indirect_dependencies = new Map();
        this.elements = [];
        this.aliases = new Map();
        this.used_names = new Set();
        this.globally_used_names = new Set();
        this.slots = new Map();
        this.slot_outlets = new Set();
        this.name = { type: 'Identifier', name };
        this.stats = stats;
        this.warnings = warnings;
        this.ast = ast;
        this.source = source;
        this.compile_options = compile_options;
        // the instance JS gets mutated, so we park
        // a copy here for later. TODO this feels gross
        this.original_ast = {
            html: ast.html,
            css: ast.css,
            instance: ast.instance && JSON.parse(JSON.stringify(ast.instance)),
            module: ast.module
        };
        this.file =
            compile_options.filename &&
                (typeof process !== 'undefined'
                    ? compile_options.filename
                        .replace(process.cwd(), '')
                        .replace(/^[/\\]/, '')
                    : compile_options.filename);
        this.locate = getLocator(this.source, { offsetLine: 1 });
        // styles
        this.stylesheet = new Stylesheet({
            source,
            ast,
            filename: compile_options.filename,
            component_name: name,
            dev: compile_options.dev,
            get_css_hash: compile_options.cssHash
        });
        this.stylesheet.validate(this);
        this.component_options = process_component_options(this, this.ast.html.children);
        this.namespace =
            namespaces[this.component_options.namespace] ||
                this.component_options.namespace;
        if (compile_options.customElement) {
            if (this.component_options.tag === undefined &&
                compile_options.tag === undefined) {
                const svelteOptions = ast.html.children.find(child => child.name === 'svelte:options') || { start: 0, end: 0 };
                this.warn(svelteOptions, {
                    code: 'custom-element-no-tag',
                    message: 'No custom element \'tag\' option was specified. To automatically register a custom element, specify a name with a hyphen in it, e.g. <svelte:options tag="my-thing"/>. To hide this warning, use <svelte:options tag={null}/>'
                });
            }
            this.tag = this.component_options.tag || compile_options.tag;
        }
        else {
            this.tag = this.name.name;
        }
        this.walk_module_js();
        this.walk_instance_js_pre_template();
        this.fragment = new Fragment(this, ast.html);
        this.name = this.get_unique_name(name);
        this.walk_instance_js_post_template();
        this.elements.forEach(element => this.stylesheet.apply(element));
        if (!compile_options.customElement)
            this.stylesheet.reify();
        this.stylesheet.warn_on_unused_selectors(this);
    }
    add_var(variable) {
        this.vars.push(variable);
        this.var_lookup.set(variable.name, variable);
    }
    add_reference(name) {
        const variable = this.var_lookup.get(name);
        if (variable) {
            variable.referenced = true;
        }
        else if (is_reserved_keyword(name)) {
            this.add_var({
                name,
                injected: true,
                referenced: true
            });
        }
        else if (name[0] === '$') {
            this.add_var({
                name,
                injected: true,
                referenced: true,
                mutated: true,
                writable: true
            });
            const subscribable_name = name.slice(1);
            const variable = this.var_lookup.get(subscribable_name);
            if (variable) {
                variable.referenced = true;
                variable.subscribable = true;
            }
        }
        else {
            this.used_names.add(name);
        }
    }
    alias(name) {
        if (!this.aliases.has(name)) {
            this.aliases.set(name, this.get_unique_name(name));
        }
        return this.aliases.get(name);
    }
    apply_stylesheet(element) {
        this.elements.push(element);
    }
    global(name) {
        const alias = this.alias(name);
        this.globals.set(name, alias);
        return alias;
    }
    generate(result) {
        let js = null;
        let css = null;
        if (result) {
            const { compile_options, name } = this;
            const { format = 'esm' } = compile_options;
            const banner = `${this.file ? `${this.file} ` : ''}generated by Svelte v${'3.35.0'}`;
            const program = { type: 'Program', body: result.js };
            walk(program, {
                enter: (node, parent, key) => {
                    if (node.type === 'Identifier') {
                        if (node.name[0] === '@') {
                            if (node.name[1] === '_') {
                                const alias = this.global(node.name.slice(2));
                                node.name = alias.name;
                            }
                            else {
                                let name = node.name.slice(1);
                                if (compile_options.dev) {
                                    if (internal_exports.has(`${name}_dev`)) {
                                        name += '_dev';
                                    }
                                    else if (internal_exports.has(`${name}Dev`)) {
                                        name += 'Dev';
                                    }
                                }
                                const alias = this.alias(name);
                                this.helpers.set(name, alias);
                                node.name = alias.name;
                            }
                        }
                        else if (node.name[0] !== '#' && !is_valid(node.name)) {
                            // this hack allows x`foo.${bar}` where bar could be invalid
                            const literal = { type: 'Literal', value: node.name };
                            if (parent.type === 'Property' && key === 'key') {
                                parent.key = literal;
                            }
                            else if (parent.type === 'MemberExpression' && key === 'property') {
                                parent.property = literal;
                                parent.computed = true;
                            }
                        }
                    }
                }
            });
            const referenced_globals = Array.from(this.globals, ([name, alias]) => name !== alias.name && { name, alias }).filter(Boolean);
            if (referenced_globals.length) {
                this.helpers.set('globals', this.alias('globals'));
            }
            const imported_helpers = Array.from(this.helpers, ([name, alias]) => ({
                name,
                alias
            }));
            create_module(program, format, name, banner, compile_options.sveltePath, imported_helpers, referenced_globals, this.imports, this.vars
                .filter(variable => variable.module && variable.export_name)
                .map(variable => ({
                name: variable.name,
                as: variable.export_name
            })));
            css = compile_options.customElement
                ? { code: null, map: null }
                : result.css;
            js = print(program, {
                sourceMapSource: compile_options.filename
            });
            js.map.sources = [
                compile_options.filename ? get_relative_path(compile_options.outputFilename || '', compile_options.filename) : null
            ];
            js.map.sourcesContent = [
                this.source
            ];
            js.map = apply_preprocessor_sourcemap(this.file, js.map, compile_options.sourcemap);
        }
        return {
            js,
            css,
            ast: this.original_ast,
            warnings: this.warnings,
            vars: this.vars
                .filter(v => !v.global && !v.internal)
                .map(v => ({
                name: v.name,
                export_name: v.export_name || null,
                injected: v.injected || false,
                module: v.module || false,
                mutated: v.mutated || false,
                reassigned: v.reassigned || false,
                referenced: v.referenced || false,
                writable: v.writable || false,
                referenced_from_script: v.referenced_from_script || false
            })),
            stats: this.stats.render()
        };
    }
    get_unique_name(name, scope) {
        if (test)
            name = `${name}$`;
        let alias = name;
        for (let i = 1; reserved.has(alias) ||
            this.var_lookup.has(alias) ||
            this.used_names.has(alias) ||
            this.globally_used_names.has(alias) ||
            (scope && scope.has(alias)); alias = `${name}_${i++}`)
            ;
        this.used_names.add(alias);
        return { type: 'Identifier', name: alias };
    }
    get_unique_name_maker() {
        const local_used_names = new Set();
        function add(name) {
            local_used_names.add(name);
        }
        reserved.forEach(add);
        internal_exports.forEach(add);
        this.var_lookup.forEach((_value, key) => add(key));
        return (name) => {
            if (test)
                name = `${name}$`;
            let alias = name;
            for (let i = 1; this.used_names.has(alias) || local_used_names.has(alias); alias = `${name}_${i++}`)
                ;
            local_used_names.add(alias);
            this.globally_used_names.add(alias);
            return {
                type: 'Identifier',
                name: alias
            };
        };
    }
    error(pos, e) {
        error(e.message, {
            name: 'ValidationError',
            code: e.code,
            source: this.source,
            start: pos.start,
            end: pos.end,
            filename: this.compile_options.filename
        });
    }
    warn(pos, warning) {
        if (this.ignores && this.ignores.has(warning.code)) {
            return;
        }
        const start = this.locate(pos.start);
        const end = this.locate(pos.end);
        const frame = get_code_frame(this.source, start.line - 1, start.column);
        this.warnings.push({
            code: warning.code,
            message: warning.message,
            frame,
            start,
            end,
            pos: pos.start,
            filename: this.compile_options.filename,
            toString: () => `${warning.message} (${start.line}:${start.column})\n${frame}`
        });
    }
    extract_imports(node) {
        this.imports.push(node);
    }
    extract_exports(node) {
        if (node.type === 'ExportDefaultDeclaration') {
            this.error(node, {
                code: 'default-export',
                message: 'A component cannot have a default export'
            });
        }
        if (node.type === 'ExportNamedDeclaration') {
            if (node.source) {
                this.error(node, {
                    code: 'not-implemented',
                    message: 'A component currently cannot have an export ... from'
                });
            }
            if (node.declaration) {
                if (node.declaration.type === 'VariableDeclaration') {
                    node.declaration.declarations.forEach(declarator => {
                        extract_names(declarator.id).forEach(name => {
                            const variable = this.var_lookup.get(name);
                            variable.export_name = name;
                            if (variable.writable && !(variable.referenced || variable.referenced_from_script || variable.subscribable)) {
                                this.warn(declarator, {
                                    code: 'unused-export-let',
                                    message: `${this.name.name} has unused export property '${name}'. If it is for external reference only, please consider using \`export const ${name}\``
                                });
                            }
                        });
                    });
                }
                else {
                    const { name } = node.declaration.id;
                    const variable = this.var_lookup.get(name);
                    variable.export_name = name;
                }
                return node.declaration;
            }
            else {
                node.specifiers.forEach(specifier => {
                    const variable = this.var_lookup.get(specifier.local.name);
                    if (variable) {
                        variable.export_name = specifier.exported.name;
                        if (variable.writable && !(variable.referenced || variable.referenced_from_script || variable.subscribable)) {
                            this.warn(specifier, {
                                code: 'unused-export-let',
                                message: `${this.name.name} has unused export property '${specifier.exported.name}'. If it is for external reference only, please consider using \`export const ${specifier.exported.name}\``
                            });
                        }
                    }
                });
                return null;
            }
        }
    }
    extract_javascript(script) {
        if (!script)
            return null;
        return script.content.body.filter(node => {
            if (!node)
                return false;
            if (this.hoistable_nodes.has(node))
                return false;
            if (this.reactive_declaration_nodes.has(node))
                return false;
            if (node.type === 'ImportDeclaration')
                return false;
            if (node.type === 'ExportDeclaration' && node.specifiers.length > 0)
                return false;
            return true;
        });
    }
    walk_module_js() {
        const component = this;
        const script = this.ast.module;
        if (!script)
            return;
        walk(script.content, {
            enter(node) {
                if (node.type === 'LabeledStatement' && node.label.name === '$') {
                    component.warn(node, {
                        code: 'module-script-reactive-declaration',
                        message: '$: has no effect in a module script'
                    });
                }
            }
        });
        const { scope, globals } = create_scopes(script.content);
        this.module_scope = scope;
        scope.declarations.forEach((node, name) => {
            if (name[0] === '$') {
                this.error(node, {
                    code: 'illegal-declaration',
                    message: 'The $ prefix is reserved, and cannot be used for variable and import names'
                });
            }
            const writable = node.type === 'VariableDeclaration' && (node.kind === 'var' || node.kind === 'let');
            this.add_var({
                name,
                module: true,
                hoistable: true,
                writable
            });
        });
        globals.forEach((node, name) => {
            if (name[0] === '$') {
                this.error(node, {
                    code: 'illegal-subscription',
                    message: 'Cannot reference store value inside <script context="module">'
                });
            }
            else {
                this.add_var({
                    name,
                    global: true,
                    hoistable: true
                });
            }
        });
        const { body } = script.content;
        let i = body.length;
        while (--i >= 0) {
            const node = body[i];
            if (node.type === 'ImportDeclaration') {
                this.extract_imports(node);
                body.splice(i, 1);
            }
            if (/^Export/.test(node.type)) {
                const replacement = this.extract_exports(node);
                if (replacement) {
                    body[i] = replacement;
                }
                else {
                    body.splice(i, 1);
                }
            }
        }
    }
    walk_instance_js_pre_template() {
        const script = this.ast.instance;
        if (!script)
            return;
        // inject vars for reactive declarations
        script.content.body.forEach(node => {
            if (node.type !== 'LabeledStatement')
                return;
            if (node.body.type !== 'ExpressionStatement')
                return;
            const { expression } = node.body;
            if (expression.type !== 'AssignmentExpression')
                return;
            if (expression.left.type === 'MemberExpression')
                return;
            extract_names(expression.left).forEach(name => {
                if (!this.var_lookup.has(name) && name[0] !== '$') {
                    this.injected_reactive_declaration_vars.add(name);
                }
            });
        });
        const { scope: instance_scope, map, globals } = create_scopes(script.content);
        this.instance_scope = instance_scope;
        this.instance_scope_map = map;
        instance_scope.declarations.forEach((node, name) => {
            if (name[0] === '$') {
                this.error(node, {
                    code: 'illegal-declaration',
                    message: 'The $ prefix is reserved, and cannot be used for variable and import names'
                });
            }
            const writable = node.type === 'VariableDeclaration' && (node.kind === 'var' || node.kind === 'let');
            const imported = node.type.startsWith('Import');
            this.add_var({
                name,
                initialised: instance_scope.initialised_declarations.has(name),
                writable,
                imported
            });
            this.node_for_declaration.set(name, node);
        });
        globals.forEach((node, name) => {
            if (this.var_lookup.has(name))
                return;
            if (this.injected_reactive_declaration_vars.has(name)) {
                this.add_var({
                    name,
                    injected: true,
                    writable: true,
                    reassigned: true,
                    initialised: true
                });
            }
            else if (is_reserved_keyword(name)) {
                this.add_var({
                    name,
                    injected: true
                });
            }
            else if (name[0] === '$') {
                if (name === '$' || name[1] === '$') {
                    this.error(node, {
                        code: 'illegal-global',
                        message: `${name} is an illegal variable name`
                    });
                }
                this.add_var({
                    name,
                    injected: true,
                    mutated: true,
                    writable: true
                });
                this.add_reference(name.slice(1));
                const variable = this.var_lookup.get(name.slice(1));
                if (variable) {
                    variable.subscribable = true;
                    variable.referenced_from_script = true;
                }
            }
            else {
                this.add_var({
                    name,
                    global: true,
                    hoistable: true
                });
            }
        });
        this.track_references_and_mutations();
    }
    walk_instance_js_post_template() {
        const script = this.ast.instance;
        if (!script)
            return;
        this.post_template_walk();
        this.hoist_instance_declarations();
        this.extract_reactive_declarations();
    }
    post_template_walk() {
        const script = this.ast.instance;
        if (!script)
            return;
        const component = this;
        const { content } = script;
        const { instance_scope, instance_scope_map: map } = this;
        let scope = instance_scope;
        const to_remove = [];
        const remove = (parent, prop, index) => {
            to_remove.unshift([parent, prop, index]);
        };
        let scope_updated = false;
        let generator_count = 0;
        walk(content, {
            enter(node, parent, prop, index) {
                if ((node.type === 'FunctionDeclaration' || node.type === 'FunctionExpression') && node.generator === true) {
                    generator_count++;
                }
                if (map.has(node)) {
                    scope = map.get(node);
                }
                if (node.type === 'ImportDeclaration') {
                    component.extract_imports(node);
                    // TODO: to use actual remove
                    remove(parent, prop, index);
                    return this.skip();
                }
                if (/^Export/.test(node.type)) {
                    const replacement = component.extract_exports(node);
                    if (replacement) {
                        this.replace(replacement);
                    }
                    else {
                        // TODO: to use actual remove
                        remove(parent, prop, index);
                    }
                    return this.skip();
                }
                component.warn_on_undefined_store_value_references(node, parent, prop, scope);
            },
            leave(node) {
                if ((node.type === 'FunctionDeclaration' || node.type === 'FunctionExpression') && node.generator === true) {
                    generator_count--;
                }
                // do it on leave, to prevent infinite loop
                if (component.compile_options.dev && component.compile_options.loopGuardTimeout > 0 && generator_count <= 0) {
                    const to_replace_for_loop_protect = component.loop_protect(node, scope, component.compile_options.loopGuardTimeout);
                    if (to_replace_for_loop_protect) {
                        this.replace(to_replace_for_loop_protect);
                        scope_updated = true;
                    }
                }
                if (map.has(node)) {
                    scope = scope.parent;
                }
            }
        });
        for (const [parent, prop, index] of to_remove) {
            if (parent) {
                if (index !== null) {
                    parent[prop].splice(index, 1);
                }
                else {
                    delete parent[prop];
                }
            }
        }
        if (scope_updated) {
            const { scope, map } = create_scopes(script.content);
            this.instance_scope = scope;
            this.instance_scope_map = map;
        }
    }
    track_references_and_mutations() {
        const script = this.ast.instance;
        if (!script)
            return;
        const component = this;
        const { content } = script;
        const { instance_scope, module_scope, instance_scope_map: map } = this;
        let scope = instance_scope;
        walk(content, {
            enter(node, parent) {
                if (map.has(node)) {
                    scope = map.get(node);
                }
                if (node.type === 'AssignmentExpression' || node.type === 'UpdateExpression') {
                    const assignee = node.type === 'AssignmentExpression' ? node.left : node.argument;
                    const names = extract_names(assignee);
                    const deep = assignee.type === 'MemberExpression';
                    names.forEach(name => {
                        const scope_owner = scope.find_owner(name);
                        if (scope_owner !== null
                            ? scope_owner === instance_scope
                            : module_scope && module_scope.has(name)) {
                            const variable = component.var_lookup.get(name);
                            variable[deep ? 'mutated' : 'reassigned'] = true;
                        }
                    });
                }
                if (is_used_as_reference(node, parent)) {
                    const object = get_object(node);
                    if (scope.find_owner(object.name) === instance_scope) {
                        const variable = component.var_lookup.get(object.name);
                        variable.referenced_from_script = true;
                    }
                }
            },
            leave(node) {
                if (map.has(node)) {
                    scope = scope.parent;
                }
            }
        });
    }
    warn_on_undefined_store_value_references(node, parent, prop, scope) {
        if (node.type === 'LabeledStatement' &&
            node.label.name === '$' &&
            parent.type !== 'Program') {
            this.warn(node, {
                code: 'non-top-level-reactive-declaration',
                message: '$: has no effect outside of the top-level'
            });
        }
        if (isReference(node, parent)) {
            const object = get_object(node);
            const { name } = object;
            if (name[0] === '$') {
                if (!scope.has(name)) {
                    this.warn_if_undefined(name, object, null);
                }
                if (name[1] !== '$' && scope.has(name.slice(1)) && scope.find_owner(name.slice(1)) !== this.instance_scope) {
                    if (!((/Function/.test(parent.type) && prop === 'params') || (parent.type === 'VariableDeclarator' && prop === 'id'))) {
                        this.error(node, {
                            code: 'contextual-store',
                            message: 'Stores must be declared at the top level of the component (this may change in a future version of Svelte)'
                        });
                    }
                }
            }
        }
    }
    loop_protect(node, scope, timeout) {
        if (node.type === 'WhileStatement' ||
            node.type === 'ForStatement' ||
            node.type === 'DoWhileStatement') {
            const guard = this.get_unique_name('guard', scope);
            this.used_names.add(guard.name);
            const before = b `const ${guard} = @loop_guard(${timeout})`;
            const inside = b `${guard}();`;
            // wrap expression statement with BlockStatement
            if (node.body.type !== 'BlockStatement') {
                node.body = {
                    type: 'BlockStatement',
                    body: [node.body]
                };
            }
            node.body.body.push(inside[0]);
            return {
                type: 'BlockStatement',
                body: [
                    before[0],
                    node
                ]
            };
        }
        return null;
    }
    rewrite_props(get_insert) {
        if (!this.ast.instance)
            return;
        const component = this;
        const { instance_scope, instance_scope_map: map } = this;
        let scope = instance_scope;
        walk(this.ast.instance.content, {
            enter(node, parent, key, index) {
                if (/Function/.test(node.type)) {
                    return this.skip();
                }
                if (map.has(node)) {
                    scope = map.get(node);
                }
                if (node.type === 'VariableDeclaration') {
                    if (node.kind === 'var' || scope === instance_scope) {
                        node.declarations.forEach(declarator => {
                            if (declarator.id.type !== 'Identifier') {
                                const inserts = [];
                                extract_names(declarator.id).forEach(name => {
                                    const variable = component.var_lookup.get(name);
                                    if (variable.export_name) {
                                        // TODO is this still true post-#3539?
                                        component.error(declarator, {
                                            code: 'destructured-prop',
                                            message: 'Cannot declare props in destructured declaration'
                                        });
                                    }
                                    if (variable.subscribable) {
                                        inserts.push(get_insert(variable));
                                    }
                                });
                                if (inserts.length) {
                                    parent[key].splice(index + 1, 0, ...inserts);
                                }
                                return;
                            }
                            const { name } = declarator.id;
                            const variable = component.var_lookup.get(name);
                            if (variable.export_name && variable.writable) {
                                declarator.id = {
                                    type: 'ObjectPattern',
                                    properties: [{
                                            type: 'Property',
                                            method: false,
                                            shorthand: false,
                                            computed: false,
                                            kind: 'init',
                                            key: { type: 'Identifier', name: variable.export_name },
                                            value: declarator.init
                                                ? {
                                                    type: 'AssignmentPattern',
                                                    left: declarator.id,
                                                    right: declarator.init
                                                }
                                                : declarator.id
                                        }]
                                };
                                declarator.init = x `$$props`;
                            }
                            if (variable.subscribable && declarator.init) {
                                const insert = get_insert(variable);
                                parent[key].splice(index + 1, 0, ...insert);
                            }
                        });
                    }
                }
            },
            leave(node, parent, _key, index) {
                if (map.has(node)) {
                    scope = scope.parent;
                }
                if (node.type === 'ExportNamedDeclaration' && node.declaration) {
                    parent.body[index] = node.declaration;
                }
            }
        });
    }
    hoist_instance_declarations() {
        // we can safely hoist variable declarations that are
        // initialised to literals, and functions that don't
        // reference instance variables other than other
        // hoistable functions. TODO others?
        const { hoistable_nodes, var_lookup, injected_reactive_declaration_vars, imports } = this;
        const top_level_function_declarations = new Map();
        const { body } = this.ast.instance.content;
        for (let i = 0; i < body.length; i += 1) {
            const node = body[i];
            if (node.type === 'VariableDeclaration') {
                const all_hoistable = node.declarations.every(d => {
                    if (!d.init)
                        return false;
                    if (d.init.type !== 'Literal')
                        return false;
                    // everything except const values can be changed by e.g. svelte devtools
                    // which means we can't hoist it
                    if (node.kind !== 'const' && this.compile_options.dev)
                        return false;
                    const { name } = d.id;
                    const v = this.var_lookup.get(name);
                    if (v.reassigned)
                        return false;
                    if (v.export_name)
                        return false;
                    if (this.var_lookup.get(name).reassigned)
                        return false;
                    if (this.vars.find(variable => variable.name === name && variable.module)) {
                        return false;
                    }
                    return true;
                });
                if (all_hoistable) {
                    node.declarations.forEach(d => {
                        const variable = this.var_lookup.get(d.id.name);
                        variable.hoistable = true;
                    });
                    hoistable_nodes.add(node);
                    body.splice(i--, 1);
                    this.fully_hoisted.push(node);
                }
            }
            if (node.type === 'ExportNamedDeclaration' &&
                node.declaration &&
                node.declaration.type === 'FunctionDeclaration') {
                top_level_function_declarations.set(node.declaration.id.name, node);
            }
            if (node.type === 'FunctionDeclaration') {
                top_level_function_declarations.set(node.id.name, node);
            }
        }
        const checked = new Set();
        const walking = new Set();
        const is_hoistable = fn_declaration => {
            if (fn_declaration.type === 'ExportNamedDeclaration') {
                fn_declaration = fn_declaration.declaration;
            }
            const instance_scope = this.instance_scope;
            let scope = this.instance_scope;
            const map = this.instance_scope_map;
            let hoistable = true;
            // handle cycles
            walking.add(fn_declaration);
            walk(fn_declaration, {
                enter(node, parent) {
                    if (!hoistable)
                        return this.skip();
                    if (map.has(node)) {
                        scope = map.get(node);
                    }
                    if (isReference(node, parent)) {
                        const { name } = flatten_reference(node);
                        const owner = scope.find_owner(name);
                        if (injected_reactive_declaration_vars.has(name)) {
                            hoistable = false;
                        }
                        else if (name[0] === '$' && !owner) {
                            hoistable = false;
                        }
                        else if (owner === instance_scope) {
                            const variable = var_lookup.get(name);
                            if (variable.reassigned || variable.mutated)
                                hoistable = false;
                            if (name === fn_declaration.id.name)
                                return;
                            if (variable.hoistable)
                                return;
                            if (top_level_function_declarations.has(name)) {
                                const other_declaration = top_level_function_declarations.get(name);
                                if (walking.has(other_declaration)) {
                                    hoistable = false;
                                }
                                else if (other_declaration.type === 'ExportNamedDeclaration' &&
                                    walking.has(other_declaration.declaration)) {
                                    hoistable = false;
                                }
                                else if (!is_hoistable(other_declaration)) {
                                    hoistable = false;
                                }
                            }
                            else {
                                hoistable = false;
                            }
                        }
                        this.skip();
                    }
                },
                leave(node) {
                    if (map.has(node)) {
                        scope = scope.parent;
                    }
                }
            });
            checked.add(fn_declaration);
            walking.delete(fn_declaration);
            return hoistable;
        };
        for (const [name, node] of top_level_function_declarations) {
            if (is_hoistable(node)) {
                const variable = this.var_lookup.get(name);
                variable.hoistable = true;
                hoistable_nodes.add(node);
                const i = body.indexOf(node);
                body.splice(i, 1);
                this.fully_hoisted.push(node);
            }
        }
        for (const { specifiers } of imports) {
            for (const specifier of specifiers) {
                const variable = var_lookup.get(specifier.local.name);
                if (!variable.mutated || variable.subscribable) {
                    variable.hoistable = true;
                }
            }
        }
    }
    extract_reactive_declarations() {
        const component = this;
        const unsorted_reactive_declarations = [];
        this.ast.instance.content.body.forEach(node => {
            if (node.type === 'LabeledStatement' && node.label.name === '$') {
                this.reactive_declaration_nodes.add(node);
                const assignees = new Set();
                const assignee_nodes = new Set();
                const dependencies = new Set();
                let scope = this.instance_scope;
                const map = this.instance_scope_map;
                walk(node.body, {
                    enter(node, parent) {
                        if (map.has(node)) {
                            scope = map.get(node);
                        }
                        if (node.type === 'AssignmentExpression') {
                            const left = get_object(node.left);
                            extract_identifiers(left).forEach(node => {
                                assignee_nodes.add(node);
                                assignees.add(node.name);
                            });
                            if (node.operator !== '=') {
                                dependencies.add(left.name);
                            }
                        }
                        else if (node.type === 'UpdateExpression') {
                            const identifier = get_object(node.argument);
                            assignees.add(identifier.name);
                        }
                        else if (isReference(node, parent)) {
                            const identifier = get_object(node);
                            if (!assignee_nodes.has(identifier)) {
                                const { name } = identifier;
                                const owner = scope.find_owner(name);
                                const variable = component.var_lookup.get(name);
                                let should_add_as_dependency = true;
                                if (variable) {
                                    variable.is_reactive_dependency = true;
                                    if (variable.module) {
                                        should_add_as_dependency = false;
                                        component.warn(node, {
                                            code: 'module-script-reactive-declaration',
                                            message: `"${name}" is declared in a module script and will not be reactive`
                                        });
                                    }
                                }
                                const is_writable_or_mutated = variable && (variable.writable || variable.mutated);
                                if (should_add_as_dependency &&
                                    (!owner || owner === component.instance_scope) &&
                                    (name[0] === '$' || is_writable_or_mutated)) {
                                    dependencies.add(name);
                                }
                            }
                            this.skip();
                        }
                    },
                    leave(node) {
                        if (map.has(node)) {
                            scope = scope.parent;
                        }
                    }
                });
                const { expression } = node.body;
                const declaration = expression && expression.left;
                unsorted_reactive_declarations.push({
                    assignees,
                    dependencies,
                    node,
                    declaration
                });
            }
        });
        const lookup = new Map();
        unsorted_reactive_declarations.forEach(declaration => {
            declaration.assignees.forEach(name => {
                if (!lookup.has(name)) {
                    lookup.set(name, []);
                }
                // TODO warn or error if a name is assigned to in
                // multiple reactive declarations?
                lookup.get(name).push(declaration);
            });
        });
        const cycle = check_graph_for_cycles(unsorted_reactive_declarations.reduce((acc, declaration) => {
            declaration.assignees.forEach(v => {
                declaration.dependencies.forEach(w => {
                    if (!declaration.assignees.has(w)) {
                        acc.push([v, w]);
                    }
                });
            });
            return acc;
        }, []));
        if (cycle && cycle.length) {
            const declarationList = lookup.get(cycle[0]);
            const declaration = declarationList[0];
            this.error(declaration.node, {
                code: 'cyclical-reactive-declaration',
                message: `Cyclical dependency detected: ${cycle.join(' → ')}`
            });
        }
        const add_declaration = declaration => {
            if (this.reactive_declarations.includes(declaration))
                return;
            declaration.dependencies.forEach(name => {
                if (declaration.assignees.has(name))
                    return;
                const earlier_declarations = lookup.get(name);
                if (earlier_declarations) {
                    earlier_declarations.forEach(add_declaration);
                }
            });
            this.reactive_declarations.push(declaration);
        };
        unsorted_reactive_declarations.forEach(add_declaration);
    }
    warn_if_undefined(name, node, template_scope) {
        if (name[0] === '$') {
            if (name === '$' || name[1] === '$' && !is_reserved_keyword(name)) {
                this.error(node, {
                    code: 'illegal-global',
                    message: `${name} is an illegal variable name`
                });
            }
            this.has_reactive_assignments = true; // TODO does this belong here?
            if (is_reserved_keyword(name))
                return;
            name = name.slice(1);
        }
        if (this.var_lookup.has(name) && !this.var_lookup.get(name).global)
            return;
        if (template_scope && template_scope.names.has(name))
            return;
        if (globals.has(name) && node.type !== 'InlineComponent')
            return;
        let message = `'${name}' is not defined`;
        if (!this.ast.instance) {
            message += `. Consider adding a <script> block with 'export let ${name}' to declare a prop`;
        }
        this.warn(node, {
            code: 'missing-declaration',
            message
        });
    }
    push_ignores(ignores) {
        this.ignores = new Set(this.ignores || []);
        add_to_set(this.ignores, ignores);
        this.ignore_stack.push(this.ignores);
    }
    pop_ignores() {
        this.ignore_stack.pop();
        this.ignores = this.ignore_stack[this.ignore_stack.length - 1];
    }
}
function process_component_options(component, nodes) {
    const component_options = {
        immutable: component.compile_options.immutable || false,
        accessors: 'accessors' in component.compile_options
            ? component.compile_options.accessors
            : !!component.compile_options.customElement,
        preserveWhitespace: !!component.compile_options.preserveWhitespace,
        namespace: component.compile_options.namespace
    };
    const node = nodes.find(node => node.name === 'svelte:options');
    function get_value(attribute, code, message) {
        const { value } = attribute;
        const chunk = value[0];
        if (!chunk)
            return true;
        if (value.length > 1) {
            component.error(attribute, { code, message });
        }
        if (chunk.type === 'Text')
            return chunk.data;
        if (chunk.expression.type !== 'Literal') {
            component.error(attribute, { code, message });
        }
        return chunk.expression.value;
    }
    if (node) {
        node.attributes.forEach(attribute => {
            if (attribute.type === 'Attribute') {
                const { name } = attribute;
                switch (name) {
                    case 'tag': {
                        const code = 'invalid-tag-attribute';
                        const message = "'tag' must be a string literal";
                        const tag = get_value(attribute, code, message);
                        if (typeof tag !== 'string' && tag !== null) {
                            component.error(attribute, { code, message });
                        }
                        if (tag && !/^[a-zA-Z][a-zA-Z0-9]*-[a-zA-Z0-9-]+$/.test(tag)) {
                            component.error(attribute, {
                                code: 'invalid-tag-property',
                                message: "tag name must be two or more words joined by the '-' character"
                            });
                        }
                        if (tag && !component.compile_options.customElement) {
                            component.warn(attribute, {
                                code: 'missing-custom-element-compile-options',
                                message: "The 'tag' option is used when generating a custom element. Did you forget the 'customElement: true' compile option?"
                            });
                        }
                        component_options.tag = tag;
                        break;
                    }
                    case 'namespace': {
                        const code = 'invalid-namespace-attribute';
                        const message = "The 'namespace' attribute must be a string literal representing a valid namespace";
                        const ns = get_value(attribute, code, message);
                        if (typeof ns !== 'string') {
                            component.error(attribute, { code, message });
                        }
                        if (valid_namespaces.indexOf(ns) === -1) {
                            const match = fuzzymatch(ns, valid_namespaces);
                            if (match) {
                                component.error(attribute, {
                                    code: 'invalid-namespace-property',
                                    message: `Invalid namespace '${ns}' (did you mean '${match}'?)`
                                });
                            }
                            else {
                                component.error(attribute, {
                                    code: 'invalid-namespace-property',
                                    message: `Invalid namespace '${ns}'`
                                });
                            }
                        }
                        component_options.namespace = ns;
                        break;
                    }
                    case 'accessors':
                    case 'immutable':
                    case 'preserveWhitespace': {
                        const code = `invalid-${name}-value`;
                        const message = `${name} attribute must be true or false`;
                        const value = get_value(attribute, code, message);
                        if (typeof value !== 'boolean') {
                            component.error(attribute, { code, message });
                        }
                        component_options[name] = value;
                        break;
                    }
                    default:
                        component.error(attribute, {
                            code: 'invalid-options-attribute',
                            message: '<svelte:options> unknown attribute'
                        });
                }
            }
            else {
                component.error(attribute, {
                    code: 'invalid-options-attribute',
                    message: "<svelte:options> can only have static 'tag', 'namespace', 'accessors', 'immutable' and 'preserveWhitespace' attributes"
                });
            }
        });
    }
    return component_options;
}
function get_relative_path(from, to) {
    const from_parts = from.split(/[/\\]/);
    const to_parts = to.split(/[/\\]/);
    from_parts.pop(); // get dirname
    while (from_parts[0] === to_parts[0]) {
        from_parts.shift();
        to_parts.shift();
    }
    if (from_parts.length) {
        let i = from_parts.length;
        while (i--)
            from_parts[i] = '..';
    }
    return from_parts.concat(to_parts).join('/');
}

function get_name_from_filename(filename) {
    if (!filename)
        return null;
    const parts = filename.split(/[/\\]/).map(encodeURI);
    if (parts.length > 1) {
        const index_match = parts[parts.length - 1].match(/^index(\.\w+)/);
        if (index_match) {
            parts.pop();
            parts[parts.length - 1] += index_match[1];
        }
    }
    const base = parts.pop()
        .replace(/%/g, 'u')
        .replace(/\.[^.]+$/, '')
        .replace(/[^a-zA-Z_$0-9]+/g, '_')
        .replace(/^_/, '')
        .replace(/_$/, '')
        .replace(/^(\d)/, '_$1');
    if (!base) {
        throw new Error(`Could not derive component name from file ${filename}`);
    }
    return base[0].toUpperCase() + base.slice(1);
}

const valid_options = [
    'format',
    'name',
    'filename',
    'sourcemap',
    'generate',
    'outputFilename',
    'cssOutputFilename',
    'sveltePath',
    'dev',
    'accessors',
    'immutable',
    'hydratable',
    'legacy',
    'customElement',
    'namespace',
    'tag',
    'css',
    'loopGuardTimeout',
    'preserveComments',
    'preserveWhitespace',
    'cssHash'
];
function validate_options(options, warnings) {
    const { name, filename, loopGuardTimeout, dev, namespace } = options;
    Object.keys(options).forEach(key => {
        if (!valid_options.includes(key)) {
            const match = fuzzymatch(key, valid_options);
            let message = `Unrecognized option '${key}'`;
            if (match)
                message += ` (did you mean '${match}'?)`;
            throw new Error(message);
        }
    });
    if (name && !/^[a-zA-Z_$][a-zA-Z_$0-9]*$/.test(name)) {
        throw new Error(`options.name must be a valid identifier (got '${name}')`);
    }
    if (name && /^[a-z]/.test(name)) {
        const message = 'options.name should be capitalised';
        warnings.push({
            code: 'options-lowercase-name',
            message,
            filename,
            toString: () => message
        });
    }
    if (loopGuardTimeout && !dev) {
        const message = 'options.loopGuardTimeout is for options.dev = true only';
        warnings.push({
            code: 'options-loop-guard-timeout',
            message,
            filename,
            toString: () => message
        });
    }
    if (namespace && valid_namespaces.indexOf(namespace) === -1) {
        const match = fuzzymatch(namespace, valid_namespaces);
        if (match) {
            throw new Error(`Invalid namespace '${namespace}' (did you mean '${match}'?)`);
        }
        else {
            throw new Error(`Invalid namespace '${namespace}'`);
        }
    }
}
function compile(source, options = {}) {
    options = Object.assign({ generate: 'dom', dev: false }, options);
    const stats = new Stats();
    const warnings = [];
    validate_options(options, warnings);
    stats.start('parse');
    const ast = parse$3(source, options);
    stats.stop('parse');
    stats.start('create component');
    const component = new Component(ast, source, options.name || get_name_from_filename(options.filename) || 'Component', options, stats, warnings);
    stats.stop('create component');
    const result = options.generate === false
        ? null
        : options.generate === 'ssr'
            ? ssr(component, options)
            : dom(component, options);
    return component.generate(result);
}

/**
 * Import decoded sourcemap from mozilla/source-map/SourceMapGenerator
 * Forked from source-map/lib/source-map-generator.js
 * from methods _serializeMappings and toJSON.
 * We cannot use source-map.d.ts types, because we access hidden properties.
 */
function decoded_sourcemap_from_generator(generator) {
    let previous_generated_line = 1;
    const converted_mappings = [[]];
    let result_line;
    let result_segment;
    let mapping;
    const source_idx = generator._sources.toArray()
        .reduce((acc, val, idx) => (acc[val] = idx, acc), {});
    const name_idx = generator._names.toArray()
        .reduce((acc, val, idx) => (acc[val] = idx, acc), {});
    const mappings = generator._mappings.toArray();
    result_line = converted_mappings[0];
    for (let i = 0, len = mappings.length; i < len; i++) {
        mapping = mappings[i];
        if (mapping.generatedLine > previous_generated_line) {
            while (mapping.generatedLine > previous_generated_line) {
                converted_mappings.push([]);
                previous_generated_line++;
            }
            result_line = converted_mappings[mapping.generatedLine - 1]; // line is one-based
        }
        else if (i > 0) {
            const previous_mapping = mappings[i - 1];
            if (
            // sorted by selectivity
            mapping.generatedColumn === previous_mapping.generatedColumn &&
                mapping.originalColumn === previous_mapping.originalColumn &&
                mapping.name === previous_mapping.name &&
                mapping.generatedLine === previous_mapping.generatedLine &&
                mapping.originalLine === previous_mapping.originalLine &&
                mapping.source === previous_mapping.source) {
                continue;
            }
        }
        result_line.push([mapping.generatedColumn]);
        result_segment = result_line[result_line.length - 1];
        if (mapping.source != null) {
            result_segment.push(...[
                source_idx[mapping.source],
                mapping.originalLine - 1,
                mapping.originalColumn
            ]);
            if (mapping.name != null) {
                result_segment.push(name_idx[mapping.name]);
            }
        }
    }
    const map = {
        version: generator._version,
        sources: generator._sources.toArray(),
        names: generator._names.toArray(),
        mappings: converted_mappings
    };
    if (generator._file != null) {
        map.file = generator._file;
    }
    // not needed: map.sourcesContent and map.sourceRoot
    return map;
}
function decode_map(processed) {
    let decoded_map = typeof processed.map === 'string' ? JSON.parse(processed.map) : processed.map;
    if (typeof (decoded_map.mappings) === 'string') {
        decoded_map.mappings = decode(decoded_map.mappings);
    }
    if (decoded_map._mappings && decoded_map.constructor.name === 'SourceMapGenerator') {
        // import decoded sourcemap from mozilla/source-map/SourceMapGenerator
        decoded_map = decoded_sourcemap_from_generator(decoded_map);
    }
    return decoded_map;
}

function slice_source(code_slice, offset, { file_basename, filename, get_location }) {
    return {
        source: code_slice,
        get_location: (index) => get_location(index + offset),
        file_basename,
        filename
    };
}
function calculate_replacements(re, get_replacement, source) {
    const replacements = [];
    source.replace(re, (...match) => {
        replacements.push(get_replacement(...match).then(replacement => {
            const matched_string = match[0];
            const offset = match[match.length - 2];
            return ({ offset, length: matched_string.length, replacement });
        }));
        return '';
    });
    return Promise.all(replacements);
}
function perform_replacements(replacements, source) {
    const out = new MappedCode();
    let last_end = 0;
    for (const { offset, length, replacement } of replacements) {
        const unchanged_prefix = MappedCode.from_source(slice_source(source.source.slice(last_end, offset), last_end, source));
        out.concat(unchanged_prefix).concat(replacement);
        last_end = offset + length;
    }
    const unchanged_suffix = MappedCode.from_source(slice_source(source.source.slice(last_end), last_end, source));
    return out.concat(unchanged_suffix);
}
async function replace_in_code(regex, get_replacement, location) {
    const replacements = await calculate_replacements(regex, get_replacement, location.source);
    return perform_replacements(replacements, location);
}

function get_file_basename(filename) {
    return filename.split(/[/\\]/).pop();
}
/**
 * Represents intermediate states of the preprocessing.
 */
class PreprocessResult {
    constructor(source, filename) {
        this.source = source;
        this.filename = filename;
        // sourcemap_list is sorted in reverse order from last map (index 0) to first map (index -1)
        // so we use sourcemap_list.unshift() to add new maps
        // https://github.com/ampproject/remapping#multiple-transformations-of-a-file
        this.sourcemap_list = [];
        this.dependencies = [];
        this.update_source({ string: source });
        // preprocess source must be relative to itself or equal null
        this.file_basename = filename == null ? null : get_file_basename(filename);
    }
    update_source({ string: source, map, dependencies }) {
        if (source != null) {
            this.source = source;
            this.get_location = getLocator(source);
        }
        if (map) {
            this.sourcemap_list.unshift(map);
        }
        if (dependencies) {
            this.dependencies.push(...dependencies);
        }
    }
    to_processed() {
        // Combine all the source maps for each preprocessor function into one
        const map = combine_sourcemaps(this.file_basename, this.sourcemap_list);
        return {
            // TODO return separated output, in future version where svelte.compile supports it:
            // style: { code: styleCode, map: styleMap },
            // script { code: scriptCode, map: scriptMap },
            // markup { code: markupCode, map: markupMap },
            code: this.source,
            dependencies: [...new Set(this.dependencies)],
            map: map,
            toString: () => this.source
        };
    }
}
/**
 * Convert preprocessor output for the tag content into MappedCode
 */
function processed_content_to_code(processed, location, file_basename) {
    // Convert the preprocessed code and its sourcemap to a MappedCode
    let decoded_map;
    if (processed.map) {
        decoded_map = decode_map(processed);
        // offset only segments pointing at original component source
        const source_index = decoded_map.sources.indexOf(file_basename);
        if (source_index !== -1) {
            sourcemap_add_offset(decoded_map, location, source_index);
        }
    }
    return MappedCode.from_processed(processed.code, decoded_map);
}
/**
 * Given the whole tag including content, return a `MappedCode`
 * representing the tag content replaced with `processed`.
 */
function processed_tag_to_code(processed, tag_name, attributes, source) {
    const { file_basename, get_location } = source;
    const build_mapped_code = (code, offset) => MappedCode.from_source(slice_source(code, offset, source));
    const tag_open = `<${tag_name}${attributes || ''}>`;
    const tag_close = `</${tag_name}>`;
    const tag_open_code = build_mapped_code(tag_open, 0);
    const tag_close_code = build_mapped_code(tag_close, tag_open.length + source.source.length);
    parse_attached_sourcemap(processed, tag_name);
    const content_code = processed_content_to_code(processed, get_location(tag_open.length), file_basename);
    return tag_open_code.concat(content_code).concat(tag_close_code);
}
function parse_tag_attributes(str) {
    // note: won't work with attribute values containing spaces.
    return str
        .split(/\s+/)
        .filter(Boolean)
        .reduce((attrs, attr) => {
        var _a;
        const i = attr.indexOf('=');
        const [key, value] = i > 0 ? [attr.slice(0, i), attr.slice(i + 1)] : [attr];
        const [, unquoted] = (value && value.match(/^['"](.*)['"]$/)) || [];
        return Object.assign(Object.assign({}, attrs), { [key]: (_a = (unquoted !== null && unquoted !== void 0 ? unquoted : value), (_a !== null && _a !== void 0 ? _a : true)) });
    }, {});
}
/**
 * Calculate the updates required to process all instances of the specified tag.
 */
async function process_tag(tag_name, preprocessor, source) {
    const { filename } = source;
    const tag_regex = tag_name === 'style'
        ? /<!--[^]*?-->|<style(\s[^]*?)?(?:>([^]*?)<\/style>|\/>)/gi
        : /<!--[^]*?-->|<script(\s[^]*?)?(?:>([^]*?)<\/script>|\/>)/gi;
    const dependencies = [];
    async function process_single_tag(tag_with_content, attributes = '', content = '', tag_offset) {
        const no_change = () => MappedCode.from_source(slice_source(tag_with_content, tag_offset, source));
        if (!attributes && !content)
            return no_change();
        const processed = await preprocessor({
            content: content || '',
            attributes: parse_tag_attributes(attributes || ''),
            filename
        });
        if (!processed)
            return no_change();
        if (processed.dependencies)
            dependencies.push(...processed.dependencies);
        if (!processed.map && processed.code === content)
            return no_change();
        return processed_tag_to_code(processed, tag_name, attributes, slice_source(content, tag_offset, source));
    }
    const { string, map } = await replace_in_code(tag_regex, process_single_tag, source);
    return { string, map, dependencies };
}
async function process_markup(filename, process, source) {
    const processed = await process({
        content: source.source,
        filename
    });
    if (processed) {
        return {
            string: processed.code,
            map: processed.map
                ? // TODO: can we use decode_sourcemap?
                    typeof processed.map === 'string'
                        ? JSON.parse(processed.map)
                        : processed.map
                : undefined,
            dependencies: processed.dependencies
        };
    }
    else {
        return {};
    }
}
async function preprocess(source, preprocessor, options) {
    // @ts-ignore todo: doublecheck
    const filename = (options && options.filename) || preprocessor.filename; // legacy
    const preprocessors = preprocessor ? (Array.isArray(preprocessor) ? preprocessor : [preprocessor]) : [];
    const markup = preprocessors.map(p => p.markup).filter(Boolean);
    const script = preprocessors.map(p => p.script).filter(Boolean);
    const style = preprocessors.map(p => p.style).filter(Boolean);
    const result = new PreprocessResult(source, filename);
    // TODO keep track: what preprocessor generated what sourcemap?
    // to make debugging easier = detect low-resolution sourcemaps in fn combine_mappings
    for (const process of markup) {
        result.update_source(await process_markup(filename, process, result));
    }
    for (const process of script) {
        result.update_source(await process_tag('script', process, result));
    }
    for (const preprocess of style) {
        result.update_source(await process_tag('style', preprocess, result));
    }
    return result.to_processed();
}

const VERSION = '3.35.0';

export { VERSION, compile, parse$3 as parse, preprocess, walk };
//# sourceMappingURL=compiler.mjs.map