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browser.js
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browser.js
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var Boolio = (function () {
'use strict';
// 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,
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-\u08bd\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\u0d05-\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-\u31ba\u31f0-\u31ff\u3400-\u4db5\u4e00-\u9fef\ua000-\ua48c\ua4d0-\ua4fd\ua500-\ua60c\ua610-\ua61f\ua62a\ua62b\ua640-\ua66e\ua67f-\ua69d\ua6a0-\ua6ef\ua717-\ua71f\ua722-\ua788\ua78b-\ua7bf\ua7c2-\ua7c6\ua7f7-\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-\uab67\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\u0b56\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\u0d82\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\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\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 = [0,11,2,25,2,18,2,1,2,14,3,13,35,122,70,52,268,28,4,48,48,31,14,29,6,37,11,29,3,35,5,7,2,4,43,157,19,35,5,35,5,39,9,51,157,310,10,21,11,7,153,5,3,0,2,43,2,1,4,0,3,22,11,22,10,30,66,18,2,1,11,21,11,25,71,55,7,1,65,0,16,3,2,2,2,28,43,28,4,28,36,7,2,27,28,53,11,21,11,18,14,17,111,72,56,50,14,50,14,35,477,28,11,0,9,21,155,22,13,52,76,44,33,24,27,35,30,0,12,34,4,0,13,47,15,3,22,0,2,0,36,17,2,24,85,6,2,0,2,3,2,14,2,9,8,46,39,7,3,1,3,21,2,6,2,1,2,4,4,0,19,0,13,4,159,52,19,3,21,0,33,47,21,1,2,0,185,46,42,3,37,47,21,0,60,42,14,0,72,26,230,43,117,63,32,0,161,7,3,38,17,0,2,0,29,0,11,39,8,0,22,0,12,45,20,0,35,56,264,8,2,36,18,0,50,29,113,6,2,1,2,37,22,0,26,5,2,1,2,31,15,0,328,18,270,921,103,110,18,195,2749,1070,4050,582,8634,568,8,30,114,29,19,47,17,3,32,20,6,18,689,63,129,74,6,0,67,12,65,1,2,0,29,6135,9,754,9486,286,50,2,18,3,9,395,2309,106,6,12,4,8,8,9,5991,84,2,70,2,1,3,0,3,1,3,3,2,11,2,0,2,6,2,64,2,3,3,7,2,6,2,27,2,3,2,4,2,0,4,6,2,339,3,24,2,24,2,30,2,24,2,30,2,24,2,30,2,24,2,30,2,24,2,7,2357,44,11,6,17,0,370,43,1301,196,60,67,8,0,1205,3,2,26,2,1,2,0,3,0,2,9,2,3,2,0,2,0,7,0,5,0,2,0,2,0,2,2,2,1,2,0,3,0,2,0,2,0,2,0,2,0,2,1,2,0,3,3,2,6,2,3,2,3,2,0,2,9,2,16,6,2,2,4,2,16,4421,42710,42,4148,12,221,3,5761,15,7472,3104,541];
// eslint-disable-next-line comma-spacing
var astralIdentifierCodes = [509,0,227,0,150,4,294,9,1368,2,2,1,6,3,41,2,5,0,166,1,574,3,9,9,525,10,176,2,54,14,32,9,16,3,46,10,54,9,7,2,37,13,2,9,6,1,45,0,13,2,49,13,9,3,4,9,83,11,7,0,161,11,6,9,7,3,56,1,2,6,3,1,3,2,10,0,11,1,3,6,4,4,193,17,10,9,5,0,82,19,13,9,214,6,3,8,28,1,83,16,16,9,82,12,9,9,84,14,5,9,243,14,166,9,232,6,3,6,4,0,29,9,41,6,2,3,9,0,10,10,47,15,406,7,2,7,17,9,57,21,2,13,123,5,4,0,2,1,2,6,2,0,9,9,49,4,2,1,2,4,9,9,330,3,19306,9,135,4,60,6,26,9,1014,0,2,54,8,3,19723,1,5319,4,4,5,9,7,3,6,31,3,149,2,1418,49,513,54,5,49,9,0,15,0,23,4,2,14,1361,6,2,16,3,6,2,1,2,4,262,6,10,9,419,13,1495,6,110,6,6,9,792487,239];
// 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$1[name] = new TokenType(name, options)
}
var types = {
num: new TokenType("num", startsExpr),
regexp: new TokenType("regexp", startsExpr),
string: new TokenType("string", startsExpr),
name: new TokenType("name", startsExpr),
eof: new TokenType("eof"),
// Punctuation token types.
bracketL: new TokenType("[", {beforeExpr: true, startsExpr: true}),
bracketR: new TokenType("]"),
braceL: new TokenType("{", {beforeExpr: true, startsExpr: true}),
braceR: new TokenType("}"),
parenL: new TokenType("(", {beforeExpr: true, startsExpr: true}),
parenR: new TokenType(")"),
comma: new TokenType(",", beforeExpr),
semi: new TokenType(";", beforeExpr),
colon: new TokenType(":", beforeExpr),
dot: new TokenType("."),
question: new TokenType("?", beforeExpr),
arrow: new TokenType("=>", beforeExpr),
template: new TokenType("template"),
invalidTemplate: new TokenType("invalidTemplate"),
ellipsis: new TokenType("...", beforeExpr),
backQuote: new TokenType("`", startsExpr),
dollarBraceL: new TokenType("${", {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}),
// 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 9.
ecmaVersion: 9,
// `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 : 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") { return true }
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();
if (this.options.ecmaVersion >= 6) {
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) // '('
{ 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.