3112 lines
110 KiB
JavaScript
3112 lines
110 KiB
JavaScript
// Reserved word lists for various dialects of the language
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var reservedWords = {
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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",
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5: "class enum extends super const export import",
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6: "enum",
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7: "enum",
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strict: "implements interface let package private protected public static yield",
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strictBind: "eval arguments"
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}
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// And the keywords
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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"
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var keywords = {
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5: ecma5AndLessKeywords,
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6: ecma5AndLessKeywords + " const class extends export import super"
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}
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// ## Character categories
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// Big ugly regular expressions that match characters in the
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// whitespace, identifier, and identifier-start categories. These
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// are only applied when a character is found to actually have a
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// code point above 128.
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// Generated by `bin/generate-identifier-regex.js`.
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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\u0561-\u0587\u05d0-\u05ea\u05f0-\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\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\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\u0e87\u0e88\u0e8a\u0e8d\u0e94-\u0e97\u0e99-\u0e9f\u0ea1-\u0ea3\u0ea5\u0ea7\u0eaa\u0eab\u0ead-\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-\u1877\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\u1ce9-\u1cec\u1cee-\u1cf1\u1cf5\u1cf6\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-\u312d\u3131-\u318e\u31a0-\u31ba\u31f0-\u31ff\u3400-\u4db5\u4e00-\u9fd5\ua000-\ua48c\ua4d0-\ua4fd\ua500-\ua60c\ua610-\ua61f\ua62a\ua62b\ua640-\ua66e\ua67f-\ua69d\ua6a0-\ua6ef\ua717-\ua71f\ua722-\ua788\ua78b-\ua7ae\ua7b0-\ua7b7\ua7f7-\ua801\ua803-\ua805\ua807-\ua80a\ua80c-\ua822\ua840-\ua873\ua882-\ua8b3\ua8f2-\ua8f7\ua8fb\ua8fd\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-\uab65\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"
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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\u0816-\u0819\u081b-\u0823\u0825-\u0827\u0829-\u082d\u0859-\u085b\u08d4-\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\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\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-\u0c03\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\u0d01-\u0d03\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-\u0eb9\u0ebb\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\u1cf2-\u1cf4\u1cf8\u1cf9\u1dc0-\u1df5\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\ua900-\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"
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var nonASCIIidentifierStart = new RegExp("[" + nonASCIIidentifierStartChars + "]")
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var nonASCIIidentifier = new RegExp("[" + nonASCIIidentifierStartChars + nonASCIIidentifierChars + "]")
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nonASCIIidentifierStartChars = nonASCIIidentifierChars = null
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// These are a run-length and offset encoded representation of the
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// >0xffff code points that are a valid part of identifiers. The
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// offset starts at 0x10000, and each pair of numbers represents an
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// offset to the next range, and then a size of the range. They were
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// generated by bin/generate-identifier-regex.js
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var astralIdentifierStartCodes = [0,11,2,25,2,18,2,1,2,14,3,13,35,122,70,52,268,28,4,48,48,31,17,26,6,37,11,29,3,35,5,7,2,4,43,157,19,35,5,35,5,39,9,51,157,310,10,21,11,7,153,5,3,0,2,43,2,1,4,0,3,22,11,22,10,30,66,18,2,1,11,21,11,25,71,55,7,1,65,0,16,3,2,2,2,26,45,28,4,28,36,7,2,27,28,53,11,21,11,18,14,17,111,72,56,50,14,50,785,52,76,44,33,24,27,35,42,34,4,0,13,47,15,3,22,0,2,0,36,17,2,24,85,6,2,0,2,3,2,14,2,9,8,46,39,7,3,1,3,21,2,6,2,1,2,4,4,0,19,0,13,4,159,52,19,3,54,47,21,1,2,0,185,46,42,3,37,47,21,0,60,42,86,25,391,63,32,0,449,56,264,8,2,36,18,0,50,29,881,921,103,110,18,195,2749,1070,4050,582,8634,568,8,30,114,29,19,47,17,3,32,20,6,18,881,68,12,0,67,12,65,0,32,6124,20,754,9486,1,3071,106,6,12,4,8,8,9,5991,84,2,70,2,1,3,0,3,1,3,3,2,11,2,0,2,6,2,64,2,3,3,7,2,6,2,27,2,3,2,4,2,0,4,6,2,339,3,24,2,24,2,30,2,24,2,30,2,24,2,30,2,24,2,30,2,24,2,7,4149,196,60,67,1213,3,2,26,2,1,2,0,3,0,2,9,2,3,2,0,2,0,7,0,5,0,2,0,2,0,2,2,2,1,2,0,3,0,2,0,2,0,2,0,2,0,2,1,2,0,3,3,2,6,2,3,2,3,2,0,2,9,2,16,6,2,2,4,2,16,4421,42710,42,4148,12,221,3,5761,10591,541]
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var astralIdentifierCodes = [509,0,227,0,150,4,294,9,1368,2,2,1,6,3,41,2,5,0,166,1,1306,2,54,14,32,9,16,3,46,10,54,9,7,2,37,13,2,9,52,0,13,2,49,13,10,2,4,9,83,11,7,0,161,11,6,9,7,3,57,0,2,6,3,1,3,2,10,0,11,1,3,6,4,4,193,17,10,9,87,19,13,9,214,6,3,8,28,1,83,16,16,9,82,12,9,9,84,14,5,9,423,9,838,7,2,7,17,9,57,21,2,13,19882,9,135,4,60,6,26,9,1016,45,17,3,19723,1,5319,4,4,5,9,7,3,6,31,3,149,2,1418,49,513,54,5,49,9,0,15,0,23,4,2,14,1361,6,2,16,3,6,2,1,2,4,2214,6,110,6,6,9,792487,239]
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// This has a complexity linear to the value of the code. The
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// assumption is that looking up astral identifier characters is
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// rare.
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function isInAstralSet(code, set) {
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var pos = 0x10000
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for (var i = 0; i < set.length; i += 2) {
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pos += set[i]
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if (pos > code) return false
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pos += set[i + 1]
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if (pos >= code) return true
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}
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}
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// Test whether a given character code starts an identifier.
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function isIdentifierStart(code, astral) {
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if (code < 65) return code === 36
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if (code < 91) return true
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if (code < 97) return code === 95
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if (code < 123) return true
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if (code <= 0xffff) return code >= 0xaa && nonASCIIidentifierStart.test(String.fromCharCode(code))
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if (astral === false) return false
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return isInAstralSet(code, astralIdentifierStartCodes)
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}
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// Test whether a given character is part of an identifier.
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function isIdentifierChar(code, astral) {
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if (code < 48) return code === 36
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if (code < 58) return true
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if (code < 65) return false
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if (code < 91) return true
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if (code < 97) return code === 95
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if (code < 123) return true
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if (code <= 0xffff) return code >= 0xaa && nonASCIIidentifier.test(String.fromCharCode(code))
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if (astral === false) return false
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return isInAstralSet(code, astralIdentifierStartCodes) || isInAstralSet(code, astralIdentifierCodes)
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}
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// ## Token types
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// The assignment of fine-grained, information-carrying type objects
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// allows the tokenizer to store the information it has about a
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// token in a way that is very cheap for the parser to look up.
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// All token type variables start with an underscore, to make them
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// easy to recognize.
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// The `beforeExpr` property is used to disambiguate between regular
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// expressions and divisions. It is set on all token types that can
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// be followed by an expression (thus, a slash after them would be a
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// regular expression).
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//
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// The `startsExpr` property is used to check if the token ends a
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// `yield` expression. It is set on all token types that either can
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// directly start an expression (like a quotation mark) or can
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// continue an expression (like the body of a string).
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//
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// `isLoop` marks a keyword as starting a loop, which is important
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// to know when parsing a label, in order to allow or disallow
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// continue jumps to that label.
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var TokenType = function TokenType(label, conf) {
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if ( conf === void 0 ) conf = {};
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this.label = label
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this.keyword = conf.keyword
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this.beforeExpr = !!conf.beforeExpr
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this.startsExpr = !!conf.startsExpr
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this.isLoop = !!conf.isLoop
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this.isAssign = !!conf.isAssign
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this.prefix = !!conf.prefix
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this.postfix = !!conf.postfix
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this.binop = conf.binop || null
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this.updateContext = null
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};
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function binop(name, prec) {
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return new TokenType(name, {beforeExpr: true, binop: prec})
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}
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var beforeExpr = {beforeExpr: true};
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var startsExpr = {startsExpr: true};
|
|
// Map keyword names to token types.
|
|
|
|
var keywordTypes = {}
|
|
|
|
// Succinct definitions of keyword token types
|
|
function kw(name, options) {
|
|
if ( options === void 0 ) options = {};
|
|
|
|
options.keyword = name
|
|
return keywordTypes[name] = new TokenType(name, options)
|
|
}
|
|
|
|
var tt = {
|
|
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"),
|
|
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("prefix", {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"),
|
|
_extends: kw("extends", beforeExpr),
|
|
_export: kw("export"),
|
|
_import: kw("import"),
|
|
_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) {
|
|
return code === 10 || code === 13 || code === 0x2028 || code == 0x2029
|
|
}
|
|
|
|
var nonASCIIwhitespace = /[\u1680\u180e\u2000-\u200a\u202f\u205f\u3000\ufeff]/
|
|
|
|
var skipWhiteSpace = /(?:\s|\/\/.*|\/\*[^]*?\*\/)*/g
|
|
|
|
function isArray(obj) {
|
|
return Object.prototype.toString.call(obj) === "[object Array]"
|
|
}
|
|
|
|
// Checks if an object has a property.
|
|
|
|
function has(obj, propName) {
|
|
return Object.prototype.hasOwnProperty.call(obj, propName)
|
|
}
|
|
|
|
// 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, or 5, or 6. This influences support for strict
|
|
// mode, the set of reserved words, support for getters and
|
|
// setters and other features. The default is 6.
|
|
ecmaVersion: 6,
|
|
// Source type ("script" or "module") for different semantics
|
|
sourceType: "script",
|
|
// `onInsertedSemicolon` can be a callback that will be called
|
|
// when a semicolon is automatically inserted. It will be passed
|
|
// th 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, 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,
|
|
plugins: {}
|
|
}
|
|
|
|
// 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.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)
|
|
}
|
|
}
|
|
|
|
// Registered plugins
|
|
var plugins = {}
|
|
|
|
function keywordRegexp(words) {
|
|
return new RegExp("^(" + words.replace(/ /g, "|") + ")$")
|
|
}
|
|
|
|
var Parser = function Parser(options, input, startPos) {
|
|
this.options = options = getOptions(options)
|
|
this.sourceFile = options.sourceFile
|
|
this.keywords = keywordRegexp(keywords[options.ecmaVersion >= 6 ? 6 : 5])
|
|
var reserved = options.allowReserved ? "" :
|
|
reservedWords[options.ecmaVersion] + (options.sourceType == "module" ? " await" : "")
|
|
this.reservedWords = keywordRegexp(reserved)
|
|
var reservedStrict = (reserved ? reserved + " " : "") + reservedWords.strict
|
|
this.reservedWordsStrict = keywordRegexp(reservedStrict)
|
|
this.reservedWordsStrictBind = keywordRegexp(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
|
|
|
|
// Load plugins
|
|
this.loadPlugins(options.plugins)
|
|
|
|
// Set up token state
|
|
|
|
// The current position of the tokenizer in the input.
|
|
if (startPos) {
|
|
this.pos = startPos
|
|
this.lineStart = Math.max(0, this.input.lastIndexOf("\n", startPos))
|
|
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 = tt.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.strict = this.inModule = options.sourceType === "module"
|
|
|
|
// Used to signify the start of a potential arrow function
|
|
this.potentialArrowAt = -1
|
|
|
|
// Flags to track whether we are in a function, a generator.
|
|
this.inFunction = this.inGenerator = false
|
|
// Labels in scope.
|
|
this.labels = []
|
|
|
|
// If enabled, skip leading hashbang line.
|
|
if (this.pos === 0 && options.allowHashBang && this.input.slice(0, 2) === '#!')
|
|
this.skipLineComment(2)
|
|
};
|
|
|
|
// DEPRECATED Kept for backwards compatibility until 3.0 in case a plugin uses them
|
|
Parser.prototype.isKeyword = function isKeyword (word) { return this.keywords.test(word) };
|
|
Parser.prototype.isReservedWord = function isReservedWord (word) { return this.reservedWords.test(word) };
|
|
|
|
Parser.prototype.extend = function extend (name, f) {
|
|
this[name] = f(this[name])
|
|
};
|
|
|
|
Parser.prototype.loadPlugins = function loadPlugins (pluginConfigs) {
|
|
var this$1 = this;
|
|
|
|
for (var name in pluginConfigs) {
|
|
var plugin = plugins[name]
|
|
if (!plugin) throw new Error("Plugin '" + name + "' not found")
|
|
plugin(this$1, pluginConfigs[name])
|
|
}
|
|
};
|
|
|
|
Parser.prototype.parse = function parse () {
|
|
var node = this.options.program || this.startNode()
|
|
this.nextToken()
|
|
return this.parseTopLevel(node)
|
|
};
|
|
|
|
var pp = Parser.prototype
|
|
|
|
// ## Parser utilities
|
|
|
|
// Test whether a statement node is the string literal `"use strict"`.
|
|
|
|
pp.isUseStrict = function(stmt) {
|
|
return this.options.ecmaVersion >= 5 && stmt.type === "ExpressionStatement" &&
|
|
stmt.expression.type === "Literal" &&
|
|
stmt.expression.raw.slice(1, -1) === "use strict"
|
|
}
|
|
|
|
// 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 === tt.name && this.value === name
|
|
}
|
|
|
|
// Consumes contextual keyword if possible.
|
|
|
|
pp.eatContextual = function(name) {
|
|
return this.value === name && this.eat(tt.name)
|
|
}
|
|
|
|
// 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 === tt.eof ||
|
|
this.type === tt.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(tt.semi) && !this.insertSemicolon()) this.unexpected()
|
|
}
|
|
|
|
pp.afterTrailingComma = function(tokType) {
|
|
if (this.type == tokType) {
|
|
if (this.options.onTrailingComma)
|
|
this.options.onTrailingComma(this.lastTokStart, this.lastTokStartLoc)
|
|
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")
|
|
}
|
|
|
|
var DestructuringErrors = function DestructuringErrors() {
|
|
this.shorthandAssign = 0
|
|
this.trailingComma = 0
|
|
};
|
|
|
|
pp.checkPatternErrors = function(refDestructuringErrors, andThrow) {
|
|
var trailing = refDestructuringErrors && refDestructuringErrors.trailingComma
|
|
if (!andThrow) return !!trailing
|
|
if (trailing) this.raise(trailing, "Comma is not permitted after the rest element")
|
|
}
|
|
|
|
pp.checkExpressionErrors = function(refDestructuringErrors, andThrow) {
|
|
var pos = refDestructuringErrors && refDestructuringErrors.shorthandAssign
|
|
if (!andThrow) return !!pos
|
|
if (pos) this.raise(pos, "Shorthand property assignments are valid only in destructuring patterns")
|
|
}
|
|
|
|
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 this$1 = this;
|
|
|
|
var first = true
|
|
if (!node.body) node.body = []
|
|
while (this.type !== tt.eof) {
|
|
var stmt = this$1.parseStatement(true, true)
|
|
node.body.push(stmt)
|
|
if (first) {
|
|
if (this$1.isUseStrict(stmt)) this$1.setStrict(true)
|
|
first = false
|
|
}
|
|
}
|
|
this.next()
|
|
if (this.options.ecmaVersion >= 6) {
|
|
node.sourceType = this.options.sourceType
|
|
}
|
|
return this.finishNode(node, "Program")
|
|
}
|
|
|
|
var loopLabel = {kind: "loop"};
|
|
var switchLabel = {kind: "switch"};
|
|
pp$1.isLet = function() {
|
|
if (this.type !== tt.name || this.options.ecmaVersion < 6 || this.value != "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)
|
|
if (nextCh === 91 || nextCh == 123) return true // '{' and '['
|
|
if (isIdentifierStart(nextCh, true)) {
|
|
for (var pos = next + 1; isIdentifierChar(this.input.charCodeAt(pos), true); ++pos) {}
|
|
var ident = this.input.slice(next, pos)
|
|
if (!this.isKeyword(ident)) return true
|
|
}
|
|
return false
|
|
}
|
|
|
|
// 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(declaration, topLevel) {
|
|
var starttype = this.type, node = this.startNode(), kind
|
|
|
|
if (this.isLet()) {
|
|
starttype = tt._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 tt._break: case tt._continue: return this.parseBreakContinueStatement(node, starttype.keyword)
|
|
case tt._debugger: return this.parseDebuggerStatement(node)
|
|
case tt._do: return this.parseDoStatement(node)
|
|
case tt._for: return this.parseForStatement(node)
|
|
case tt._function:
|
|
if (!declaration && this.options.ecmaVersion >= 6) this.unexpected()
|
|
return this.parseFunctionStatement(node)
|
|
case tt._class:
|
|
if (!declaration) this.unexpected()
|
|
return this.parseClass(node, true)
|
|
case tt._if: return this.parseIfStatement(node)
|
|
case tt._return: return this.parseReturnStatement(node)
|
|
case tt._switch: return this.parseSwitchStatement(node)
|
|
case tt._throw: return this.parseThrowStatement(node)
|
|
case tt._try: return this.parseTryStatement(node)
|
|
case tt._const: case tt._var:
|
|
kind = kind || this.value
|
|
if (!declaration && kind != "var") this.unexpected()
|
|
return this.parseVarStatement(node, kind)
|
|
case tt._while: return this.parseWhileStatement(node)
|
|
case tt._with: return this.parseWithStatement(node)
|
|
case tt.braceL: return this.parseBlock()
|
|
case tt.semi: return this.parseEmptyStatement(node)
|
|
case tt._export:
|
|
case tt._import:
|
|
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 === tt._import ? this.parseImport(node) : this.parseExport(node)
|
|
|
|
// 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:
|
|
var maybeName = this.value, expr = this.parseExpression()
|
|
if (starttype === tt.name && expr.type === "Identifier" && this.eat(tt.colon))
|
|
return this.parseLabeledStatement(node, maybeName, expr)
|
|
else return this.parseExpressionStatement(node, expr)
|
|
}
|
|
}
|
|
|
|
pp$1.parseBreakContinueStatement = function(node, keyword) {
|
|
var this$1 = this;
|
|
|
|
var isBreak = keyword == "break"
|
|
this.next()
|
|
if (this.eat(tt.semi) || this.insertSemicolon()) node.label = null
|
|
else if (this.type !== tt.name) this.unexpected()
|
|
else {
|
|
node.label = this.parseIdent()
|
|
this.semicolon()
|
|
}
|
|
|
|
// Verify that there is an actual destination to break or
|
|
// continue to.
|
|
for (var i = 0; i < this.labels.length; ++i) {
|
|
var lab = this$1.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(false)
|
|
this.labels.pop()
|
|
this.expect(tt._while)
|
|
node.test = this.parseParenExpression()
|
|
if (this.options.ecmaVersion >= 6)
|
|
this.eat(tt.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()
|
|
this.labels.push(loopLabel)
|
|
this.expect(tt.parenL)
|
|
if (this.type === tt.semi) return this.parseFor(node, null)
|
|
var isLet = this.isLet()
|
|
if (this.type === tt._var || this.type === tt._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 === tt._in || (this.options.ecmaVersion >= 6 && this.isContextual("of"))) && init$1.declarations.length === 1 &&
|
|
!(kind !== "var" && init$1.declarations[0].init))
|
|
return this.parseForIn(node, init$1)
|
|
return this.parseFor(node, init$1)
|
|
}
|
|
var refDestructuringErrors = new DestructuringErrors
|
|
var init = this.parseExpression(true, refDestructuringErrors)
|
|
if (this.type === tt._in || (this.options.ecmaVersion >= 6 && this.isContextual("of"))) {
|
|
this.checkPatternErrors(refDestructuringErrors, true)
|
|
this.toAssignable(init)
|
|
this.checkLVal(init)
|
|
return this.parseForIn(node, init)
|
|
} else {
|
|
this.checkExpressionErrors(refDestructuringErrors, true)
|
|
}
|
|
return this.parseFor(node, init)
|
|
}
|
|
|
|
pp$1.parseFunctionStatement = function(node) {
|
|
this.next()
|
|
return this.parseFunction(node, true)
|
|
}
|
|
|
|
pp$1.parseIfStatement = function(node) {
|
|
this.next()
|
|
node.test = this.parseParenExpression()
|
|
node.consequent = this.parseStatement(false)
|
|
node.alternate = this.eat(tt._else) ? this.parseStatement(false) : 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(tt.semi) || this.insertSemicolon()) node.argument = null
|
|
else { node.argument = this.parseExpression(); this.semicolon() }
|
|
return this.finishNode(node, "ReturnStatement")
|
|
}
|
|
|
|
pp$1.parseSwitchStatement = function(node) {
|
|
var this$1 = this;
|
|
|
|
this.next()
|
|
node.discriminant = this.parseParenExpression()
|
|
node.cases = []
|
|
this.expect(tt.braceL)
|
|
this.labels.push(switchLabel)
|
|
|
|
// Statements under must be grouped (by label) in SwitchCase
|
|
// nodes. `cur` is used to keep the node that we are currently
|
|
// adding statements to.
|
|
|
|
for (var cur, sawDefault = false; this.type != tt.braceR;) {
|
|
if (this$1.type === tt._case || this$1.type === tt._default) {
|
|
var isCase = this$1.type === tt._case
|
|
if (cur) this$1.finishNode(cur, "SwitchCase")
|
|
node.cases.push(cur = this$1.startNode())
|
|
cur.consequent = []
|
|
this$1.next()
|
|
if (isCase) {
|
|
cur.test = this$1.parseExpression()
|
|
} else {
|
|
if (sawDefault) this$1.raiseRecoverable(this$1.lastTokStart, "Multiple default clauses")
|
|
sawDefault = true
|
|
cur.test = null
|
|
}
|
|
this$1.expect(tt.colon)
|
|
} else {
|
|
if (!cur) this$1.unexpected()
|
|
cur.consequent.push(this$1.parseStatement(true))
|
|
}
|
|
}
|
|
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 === tt._catch) {
|
|
var clause = this.startNode()
|
|
this.next()
|
|
this.expect(tt.parenL)
|
|
clause.param = this.parseBindingAtom()
|
|
this.checkLVal(clause.param, true)
|
|
this.expect(tt.parenR)
|
|
clause.body = this.parseBlock()
|
|
node.handler = this.finishNode(clause, "CatchClause")
|
|
}
|
|
node.finalizer = this.eat(tt._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(false)
|
|
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(false)
|
|
return this.finishNode(node, "WithStatement")
|
|
}
|
|
|
|
pp$1.parseEmptyStatement = function(node) {
|
|
this.next()
|
|
return this.finishNode(node, "EmptyStatement")
|
|
}
|
|
|
|
pp$1.parseLabeledStatement = function(node, maybeName, expr) {
|
|
var this$1 = this;
|
|
|
|
for (var i = 0; i < this.labels.length; ++i)
|
|
if (this$1.labels[i].name === maybeName) this$1.raise(expr.start, "Label '" + maybeName + "' is already declared")
|
|
var kind = this.type.isLoop ? "loop" : this.type === tt._switch ? "switch" : null
|
|
for (var i$1 = this.labels.length - 1; i$1 >= 0; i$1--) {
|
|
var label = this$1.labels[i$1]
|
|
if (label.statementStart == node.start) {
|
|
label.statementStart = this$1.start
|
|
label.kind = kind
|
|
} else break
|
|
}
|
|
this.labels.push({name: maybeName, kind: kind, statementStart: this.start})
|
|
node.body = this.parseStatement(true)
|
|
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(allowStrict) {
|
|
var this$1 = this;
|
|
|
|
var node = this.startNode(), first = true, oldStrict
|
|
node.body = []
|
|
this.expect(tt.braceL)
|
|
while (!this.eat(tt.braceR)) {
|
|
var stmt = this$1.parseStatement(true)
|
|
node.body.push(stmt)
|
|
if (first && allowStrict && this$1.isUseStrict(stmt)) {
|
|
oldStrict = this$1.strict
|
|
this$1.setStrict(this$1.strict = true)
|
|
}
|
|
first = false
|
|
}
|
|
if (oldStrict === false) this.setStrict(false)
|
|
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(tt.semi)
|
|
node.test = this.type === tt.semi ? null : this.parseExpression()
|
|
this.expect(tt.semi)
|
|
node.update = this.type === tt.parenR ? null : this.parseExpression()
|
|
this.expect(tt.parenR)
|
|
node.body = this.parseStatement(false)
|
|
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 type = this.type === tt._in ? "ForInStatement" : "ForOfStatement"
|
|
this.next()
|
|
node.left = init
|
|
node.right = this.parseExpression()
|
|
this.expect(tt.parenR)
|
|
node.body = this.parseStatement(false)
|
|
this.labels.pop()
|
|
return this.finishNode(node, type)
|
|
}
|
|
|
|
// Parse a list of variable declarations.
|
|
|
|
pp$1.parseVar = function(node, isFor, kind) {
|
|
var this$1 = this;
|
|
|
|
node.declarations = []
|
|
node.kind = kind
|
|
for (;;) {
|
|
var decl = this$1.startNode()
|
|
this$1.parseVarId(decl)
|
|
if (this$1.eat(tt.eq)) {
|
|
decl.init = this$1.parseMaybeAssign(isFor)
|
|
} else if (kind === "const" && !(this$1.type === tt._in || (this$1.options.ecmaVersion >= 6 && this$1.isContextual("of")))) {
|
|
this$1.unexpected()
|
|
} else if (decl.id.type != "Identifier" && !(isFor && (this$1.type === tt._in || this$1.isContextual("of")))) {
|
|
this$1.raise(this$1.lastTokEnd, "Complex binding patterns require an initialization value")
|
|
} else {
|
|
decl.init = null
|
|
}
|
|
node.declarations.push(this$1.finishNode(decl, "VariableDeclarator"))
|
|
if (!this$1.eat(tt.comma)) break
|
|
}
|
|
return node
|
|
}
|
|
|
|
pp$1.parseVarId = function(decl) {
|
|
decl.id = this.parseBindingAtom()
|
|
this.checkLVal(decl.id, true)
|
|
}
|
|
|
|
// Parse a function declaration or literal (depending on the
|
|
// `isStatement` parameter).
|
|
|
|
pp$1.parseFunction = function(node, isStatement, allowExpressionBody) {
|
|
this.initFunction(node)
|
|
if (this.options.ecmaVersion >= 6)
|
|
node.generator = this.eat(tt.star)
|
|
var oldInGen = this.inGenerator
|
|
this.inGenerator = node.generator
|
|
if (isStatement || this.type === tt.name)
|
|
node.id = this.parseIdent()
|
|
this.parseFunctionParams(node)
|
|
this.parseFunctionBody(node, allowExpressionBody)
|
|
this.inGenerator = oldInGen
|
|
return this.finishNode(node, isStatement ? "FunctionDeclaration" : "FunctionExpression")
|
|
}
|
|
|
|
pp$1.parseFunctionParams = function(node) {
|
|
this.expect(tt.parenL)
|
|
node.params = this.parseBindingList(tt.parenR, false, false, true)
|
|
}
|
|
|
|
// Parse a class declaration or literal (depending on the
|
|
// `isStatement` parameter).
|
|
|
|
pp$1.parseClass = function(node, isStatement) {
|
|
var this$1 = this;
|
|
|
|
this.next()
|
|
this.parseClassId(node, isStatement)
|
|
this.parseClassSuper(node)
|
|
var classBody = this.startNode()
|
|
var hadConstructor = false
|
|
classBody.body = []
|
|
this.expect(tt.braceL)
|
|
while (!this.eat(tt.braceR)) {
|
|
if (this$1.eat(tt.semi)) continue
|
|
var method = this$1.startNode()
|
|
var isGenerator = this$1.eat(tt.star)
|
|
var isMaybeStatic = this$1.type === tt.name && this$1.value === "static"
|
|
this$1.parsePropertyName(method)
|
|
method.static = isMaybeStatic && this$1.type !== tt.parenL
|
|
if (method.static) {
|
|
if (isGenerator) this$1.unexpected()
|
|
isGenerator = this$1.eat(tt.star)
|
|
this$1.parsePropertyName(method)
|
|
}
|
|
method.kind = "method"
|
|
var isGetSet = false
|
|
if (!method.computed) {
|
|
var key = method.key;
|
|
if (!isGenerator && key.type === "Identifier" && this$1.type !== tt.parenL && (key.name === "get" || key.name === "set")) {
|
|
isGetSet = true
|
|
method.kind = key.name
|
|
key = this$1.parsePropertyName(method)
|
|
}
|
|
if (!method.static && (key.type === "Identifier" && key.name === "constructor" ||
|
|
key.type === "Literal" && key.value === "constructor")) {
|
|
if (hadConstructor) this$1.raise(key.start, "Duplicate constructor in the same class")
|
|
if (isGetSet) this$1.raise(key.start, "Constructor can't have get/set modifier")
|
|
if (isGenerator) this$1.raise(key.start, "Constructor can't be a generator")
|
|
method.kind = "constructor"
|
|
hadConstructor = true
|
|
}
|
|
}
|
|
this$1.parseClassMethod(classBody, method, isGenerator)
|
|
if (isGetSet) {
|
|
var paramCount = method.kind === "get" ? 0 : 1
|
|
if (method.value.params.length !== paramCount) {
|
|
var start = method.value.start
|
|
if (method.kind === "get")
|
|
this$1.raiseRecoverable(start, "getter should have no params")
|
|
else
|
|
this$1.raiseRecoverable(start, "setter should have exactly one param")
|
|
}
|
|
if (method.kind === "set" && method.value.params[0].type === "RestElement")
|
|
this$1.raise(method.value.params[0].start, "Setter cannot use rest params")
|
|
}
|
|
}
|
|
node.body = this.finishNode(classBody, "ClassBody")
|
|
return this.finishNode(node, isStatement ? "ClassDeclaration" : "ClassExpression")
|
|
}
|
|
|
|
pp$1.parseClassMethod = function(classBody, method, isGenerator) {
|
|
method.value = this.parseMethod(isGenerator)
|
|
classBody.body.push(this.finishNode(method, "MethodDefinition"))
|
|
}
|
|
|
|
pp$1.parseClassId = function(node, isStatement) {
|
|
node.id = this.type === tt.name ? this.parseIdent() : isStatement ? this.unexpected() : null
|
|
}
|
|
|
|
pp$1.parseClassSuper = function(node) {
|
|
node.superClass = this.eat(tt._extends) ? this.parseExprSubscripts() : null
|
|
}
|
|
|
|
// Parses module export declaration.
|
|
|
|
pp$1.parseExport = function(node) {
|
|
var this$1 = this;
|
|
|
|
this.next()
|
|
// export * from '...'
|
|
if (this.eat(tt.star)) {
|
|
this.expectContextual("from")
|
|
node.source = this.type === tt.string ? this.parseExprAtom() : this.unexpected()
|
|
this.semicolon()
|
|
return this.finishNode(node, "ExportAllDeclaration")
|
|
}
|
|
if (this.eat(tt._default)) { // export default ...
|
|
var parens = this.type == tt.parenL
|
|
var expr = this.parseMaybeAssign()
|
|
var needsSemi = true
|
|
if (!parens && (expr.type == "FunctionExpression" ||
|
|
expr.type == "ClassExpression")) {
|
|
needsSemi = false
|
|
if (expr.id) {
|
|
expr.type = expr.type == "FunctionExpression"
|
|
? "FunctionDeclaration"
|
|
: "ClassDeclaration"
|
|
}
|
|
}
|
|
node.declaration = expr
|
|
if (needsSemi) this.semicolon()
|
|
return this.finishNode(node, "ExportDefaultDeclaration")
|
|
}
|
|
// export var|const|let|function|class ...
|
|
if (this.shouldParseExportStatement()) {
|
|
node.declaration = this.parseStatement(true)
|
|
node.specifiers = []
|
|
node.source = null
|
|
} else { // export { x, y as z } [from '...']
|
|
node.declaration = null
|
|
node.specifiers = this.parseExportSpecifiers()
|
|
if (this.eatContextual("from")) {
|
|
node.source = this.type === tt.string ? this.parseExprAtom() : this.unexpected()
|
|
} else {
|
|
// check for keywords used as local names
|
|
for (var i = 0; i < node.specifiers.length; i++) {
|
|
if (this$1.keywords.test(node.specifiers[i].local.name) || this$1.reservedWords.test(node.specifiers[i].local.name)) {
|
|
this$1.unexpected(node.specifiers[i].local.start)
|
|
}
|
|
}
|
|
|
|
node.source = null
|
|
}
|
|
this.semicolon()
|
|
}
|
|
return this.finishNode(node, "ExportNamedDeclaration")
|
|
}
|
|
|
|
pp$1.shouldParseExportStatement = function() {
|
|
return this.type.keyword || this.isLet()
|
|
}
|
|
|
|
// Parses a comma-separated list of module exports.
|
|
|
|
pp$1.parseExportSpecifiers = function() {
|
|
var this$1 = this;
|
|
|
|
var nodes = [], first = true
|
|
// export { x, y as z } [from '...']
|
|
this.expect(tt.braceL)
|
|
while (!this.eat(tt.braceR)) {
|
|
if (!first) {
|
|
this$1.expect(tt.comma)
|
|
if (this$1.afterTrailingComma(tt.braceR)) break
|
|
} else first = false
|
|
|
|
var node = this$1.startNode()
|
|
node.local = this$1.parseIdent(this$1.type === tt._default)
|
|
node.exported = this$1.eatContextual("as") ? this$1.parseIdent(true) : node.local
|
|
nodes.push(this$1.finishNode(node, "ExportSpecifier"))
|
|
}
|
|
return nodes
|
|
}
|
|
|
|
// Parses import declaration.
|
|
|
|
pp$1.parseImport = function(node) {
|
|
this.next()
|
|
// import '...'
|
|
if (this.type === tt.string) {
|
|
node.specifiers = empty
|
|
node.source = this.parseExprAtom()
|
|
} else {
|
|
node.specifiers = this.parseImportSpecifiers()
|
|
this.expectContextual("from")
|
|
node.source = this.type === tt.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 this$1 = this;
|
|
|
|
var nodes = [], first = true
|
|
if (this.type === tt.name) {
|
|
// import defaultObj, { x, y as z } from '...'
|
|
var node = this.startNode()
|
|
node.local = this.parseIdent()
|
|
this.checkLVal(node.local, true)
|
|
nodes.push(this.finishNode(node, "ImportDefaultSpecifier"))
|
|
if (!this.eat(tt.comma)) return nodes
|
|
}
|
|
if (this.type === tt.star) {
|
|
var node$1 = this.startNode()
|
|
this.next()
|
|
this.expectContextual("as")
|
|
node$1.local = this.parseIdent()
|
|
this.checkLVal(node$1.local, true)
|
|
nodes.push(this.finishNode(node$1, "ImportNamespaceSpecifier"))
|
|
return nodes
|
|
}
|
|
this.expect(tt.braceL)
|
|
while (!this.eat(tt.braceR)) {
|
|
if (!first) {
|
|
this$1.expect(tt.comma)
|
|
if (this$1.afterTrailingComma(tt.braceR)) break
|
|
} else first = false
|
|
|
|
var node$2 = this$1.startNode()
|
|
node$2.imported = this$1.parseIdent(true)
|
|
if (this$1.eatContextual("as")) {
|
|
node$2.local = this$1.parseIdent()
|
|
} else {
|
|
node$2.local = node$2.imported
|
|
if (this$1.isKeyword(node$2.local.name)) this$1.unexpected(node$2.local.start)
|
|
if (this$1.reservedWordsStrict.test(node$2.local.name)) this$1.raise(node$2.local.start, "The keyword '" + node$2.local.name + "' is reserved")
|
|
}
|
|
this$1.checkLVal(node$2.local, true)
|
|
nodes.push(this$1.finishNode(node$2, "ImportSpecifier"))
|
|
}
|
|
return nodes
|
|
}
|
|
|
|
var pp$2 = Parser.prototype
|
|
|
|
// Convert existing expression atom to assignable pattern
|
|
// if possible.
|
|
|
|
pp$2.toAssignable = function(node, isBinding) {
|
|
var this$1 = this;
|
|
|
|
if (this.options.ecmaVersion >= 6 && node) {
|
|
switch (node.type) {
|
|
case "Identifier":
|
|
case "ObjectPattern":
|
|
case "ArrayPattern":
|
|
break
|
|
|
|
case "ObjectExpression":
|
|
node.type = "ObjectPattern"
|
|
for (var i = 0; i < node.properties.length; i++) {
|
|
var prop = node.properties[i]
|
|
if (prop.kind !== "init") this$1.raise(prop.key.start, "Object pattern can't contain getter or setter")
|
|
this$1.toAssignable(prop.value, isBinding)
|
|
}
|
|
break
|
|
|
|
case "ArrayExpression":
|
|
node.type = "ArrayPattern"
|
|
this.toAssignableList(node.elements, isBinding)
|
|
break
|
|
|
|
case "AssignmentExpression":
|
|
if (node.operator === "=") {
|
|
node.type = "AssignmentPattern"
|
|
delete node.operator
|
|
// falls through to AssignmentPattern
|
|
} else {
|
|
this.raise(node.left.end, "Only '=' operator can be used for specifying default value.")
|
|
break
|
|
}
|
|
|
|
case "AssignmentPattern":
|
|
if (node.right.type === "YieldExpression")
|
|
this.raise(node.right.start, "Yield expression cannot be a default value")
|
|
break
|
|
|
|
case "ParenthesizedExpression":
|
|
node.expression = this.toAssignable(node.expression, isBinding)
|
|
break
|
|
|
|
case "MemberExpression":
|
|
if (!isBinding) break
|
|
|
|
default:
|
|
this.raise(node.start, "Assigning to rvalue")
|
|
}
|
|
}
|
|
return node
|
|
}
|
|
|
|
// Convert list of expression atoms to binding list.
|
|
|
|
pp$2.toAssignableList = function(exprList, isBinding) {
|
|
var this$1 = this;
|
|
|
|
var end = exprList.length
|
|
if (end) {
|
|
var last = exprList[end - 1]
|
|
if (last && last.type == "RestElement") {
|
|
--end
|
|
} else if (last && last.type == "SpreadElement") {
|
|
last.type = "RestElement"
|
|
var arg = last.argument
|
|
this.toAssignable(arg, isBinding)
|
|
if (arg.type !== "Identifier" && arg.type !== "MemberExpression" && arg.type !== "ArrayPattern")
|
|
this.unexpected(arg.start)
|
|
--end
|
|
}
|
|
|
|
if (isBinding && last && last.type === "RestElement" && last.argument.type !== "Identifier")
|
|
this.unexpected(last.argument.start)
|
|
}
|
|
for (var i = 0; i < end; i++) {
|
|
var elt = exprList[i]
|
|
if (elt) this$1.toAssignable(elt, isBinding)
|
|
}
|
|
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.parseRest = function(allowNonIdent) {
|
|
var node = this.startNode()
|
|
this.next()
|
|
|
|
// RestElement inside of a function parameter must be an identifier
|
|
if (allowNonIdent) node.argument = this.type === tt.name ? this.parseIdent() : this.unexpected()
|
|
else node.argument = this.type === tt.name || this.type === tt.bracketL ? this.parseBindingAtom() : this.unexpected()
|
|
|
|
return this.finishNode(node, "RestElement")
|
|
}
|
|
|
|
// Parses lvalue (assignable) atom.
|
|
|
|
pp$2.parseBindingAtom = function() {
|
|
if (this.options.ecmaVersion < 6) return this.parseIdent()
|
|
switch (this.type) {
|
|
case tt.name:
|
|
return this.parseIdent()
|
|
|
|
case tt.bracketL:
|
|
var node = this.startNode()
|
|
this.next()
|
|
node.elements = this.parseBindingList(tt.bracketR, true, true)
|
|
return this.finishNode(node, "ArrayPattern")
|
|
|
|
case tt.braceL:
|
|
return this.parseObj(true)
|
|
|
|
default:
|
|
this.unexpected()
|
|
}
|
|
}
|
|
|
|
pp$2.parseBindingList = function(close, allowEmpty, allowTrailingComma, allowNonIdent) {
|
|
var this$1 = this;
|
|
|
|
var elts = [], first = true
|
|
while (!this.eat(close)) {
|
|
if (first) first = false
|
|
else this$1.expect(tt.comma)
|
|
if (allowEmpty && this$1.type === tt.comma) {
|
|
elts.push(null)
|
|
} else if (allowTrailingComma && this$1.afterTrailingComma(close)) {
|
|
break
|
|
} else if (this$1.type === tt.ellipsis) {
|
|
var rest = this$1.parseRest(allowNonIdent)
|
|
this$1.parseBindingListItem(rest)
|
|
elts.push(rest)
|
|
if (this$1.type === tt.comma) this$1.raise(this$1.start, "Comma is not permitted after the rest element")
|
|
this$1.expect(close)
|
|
break
|
|
} else {
|
|
var elem = this$1.parseMaybeDefault(this$1.start, this$1.startLoc)
|
|
this$1.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(tt.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.
|
|
|
|
pp$2.checkLVal = function(expr, isBinding, checkClashes) {
|
|
var this$1 = this;
|
|
|
|
switch (expr.type) {
|
|
case "Identifier":
|
|
if (this.strict && this.reservedWordsStrictBind.test(expr.name))
|
|
this.raiseRecoverable(expr.start, (isBinding ? "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
|
|
}
|
|
break
|
|
|
|
case "MemberExpression":
|
|
if (isBinding) this.raiseRecoverable(expr.start, (isBinding ? "Binding" : "Assigning to") + " member expression")
|
|
break
|
|
|
|
case "ObjectPattern":
|
|
for (var i = 0; i < expr.properties.length; i++)
|
|
this$1.checkLVal(expr.properties[i].value, isBinding, checkClashes)
|
|
break
|
|
|
|
case "ArrayPattern":
|
|
for (var i$1 = 0; i$1 < expr.elements.length; i$1++) {
|
|
var elem = expr.elements[i$1]
|
|
if (elem) this$1.checkLVal(elem, isBinding, checkClashes)
|
|
}
|
|
break
|
|
|
|
case "AssignmentPattern":
|
|
this.checkLVal(expr.left, isBinding, checkClashes)
|
|
break
|
|
|
|
case "RestElement":
|
|
this.checkLVal(expr.argument, isBinding, checkClashes)
|
|
break
|
|
|
|
case "ParenthesizedExpression":
|
|
this.checkLVal(expr.expression, isBinding, checkClashes)
|
|
break
|
|
|
|
default:
|
|
this.raise(expr.start, (isBinding ? "Binding" : "Assigning to") + " rvalue")
|
|
}
|
|
}
|
|
|
|
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$3.checkPropClash = function(prop, propHash) {
|
|
if (this.options.ecmaVersion >= 6 && (prop.computed || prop.method || prop.shorthand))
|
|
return
|
|
var key = prop.key;
|
|
var name
|
|
switch (key.type) {
|
|
case "Identifier": name = key.name; break
|
|
case "Literal": name = String(key.value); break
|
|
default: return
|
|
}
|
|
var kind = prop.kind;
|
|
if (this.options.ecmaVersion >= 6) {
|
|
if (name === "__proto__" && kind === "init") {
|
|
if (propHash.proto) this.raiseRecoverable(key.start, "Redefinition of __proto__ property")
|
|
propHash.proto = true
|
|
}
|
|
return
|
|
}
|
|
name = "$" + name
|
|
var other = propHash[name]
|
|
if (other) {
|
|
var isGetSet = kind !== "init"
|
|
if ((this.strict || isGetSet) && other[kind] || !(isGetSet ^ other.init))
|
|
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 this$1 = this;
|
|
|
|
var startPos = this.start, startLoc = this.startLoc
|
|
var expr = this.parseMaybeAssign(noIn, refDestructuringErrors)
|
|
if (this.type === tt.comma) {
|
|
var node = this.startNodeAt(startPos, startLoc)
|
|
node.expressions = [expr]
|
|
while (this.eat(tt.comma)) node.expressions.push(this$1.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.inGenerator && this.isContextual("yield")) return this.parseYield()
|
|
|
|
var ownDestructuringErrors = false
|
|
if (!refDestructuringErrors) {
|
|
refDestructuringErrors = new DestructuringErrors
|
|
ownDestructuringErrors = true
|
|
}
|
|
var startPos = this.start, startLoc = this.startLoc
|
|
if (this.type == tt.parenL || this.type == tt.name)
|
|
this.potentialArrowAt = this.start
|
|
var left = this.parseMaybeConditional(noIn, refDestructuringErrors)
|
|
if (afterLeftParse) left = afterLeftParse.call(this, left, startPos, startLoc)
|
|
if (this.type.isAssign) {
|
|
this.checkPatternErrors(refDestructuringErrors, true)
|
|
if (!ownDestructuringErrors) DestructuringErrors.call(refDestructuringErrors)
|
|
var node = this.startNodeAt(startPos, startLoc)
|
|
node.operator = this.value
|
|
node.left = this.type === tt.eq ? this.toAssignable(left) : left
|
|
refDestructuringErrors.shorthandAssign = 0 // 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)
|
|
}
|
|
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(tt.question)) {
|
|
var node = this.startNodeAt(startPos, startLoc)
|
|
node.test = expr
|
|
node.consequent = this.parseMaybeAssign()
|
|
this.expect(tt.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 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 !== tt._in)) {
|
|
if (prec > minPrec) {
|
|
var logical = this.type === tt.logicalOR || this.type === tt.logicalAND
|
|
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)
|
|
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 this$1 = this;
|
|
|
|
var startPos = this.start, startLoc = this.startLoc, expr
|
|
if (this.type.prefix) {
|
|
var node = this.startNode(), update = this.type === tt.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$1.startNodeAt(startPos, startLoc)
|
|
node$1.operator = this$1.value
|
|
node$1.prefix = false
|
|
node$1.argument = expr
|
|
this$1.checkLVal(expr)
|
|
this$1.next()
|
|
expr = this$1.finishNode(node$1, "UpdateExpression")
|
|
}
|
|
}
|
|
|
|
if (!sawUnary && this.eat(tt.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)
|
|
var skipArrowSubscripts = expr.type === "ArrowFunctionExpression" && this.input.slice(this.lastTokStart, this.lastTokEnd) !== ")"
|
|
if (this.checkExpressionErrors(refDestructuringErrors) || skipArrowSubscripts) return expr
|
|
return this.parseSubscripts(expr, startPos, startLoc)
|
|
}
|
|
|
|
pp$3.parseSubscripts = function(base, startPos, startLoc, noCalls) {
|
|
var this$1 = this;
|
|
|
|
for (;;) {
|
|
if (this$1.eat(tt.dot)) {
|
|
var node = this$1.startNodeAt(startPos, startLoc)
|
|
node.object = base
|
|
node.property = this$1.parseIdent(true)
|
|
node.computed = false
|
|
base = this$1.finishNode(node, "MemberExpression")
|
|
} else if (this$1.eat(tt.bracketL)) {
|
|
var node$1 = this$1.startNodeAt(startPos, startLoc)
|
|
node$1.object = base
|
|
node$1.property = this$1.parseExpression()
|
|
node$1.computed = true
|
|
this$1.expect(tt.bracketR)
|
|
base = this$1.finishNode(node$1, "MemberExpression")
|
|
} else if (!noCalls && this$1.eat(tt.parenL)) {
|
|
var node$2 = this$1.startNodeAt(startPos, startLoc)
|
|
node$2.callee = base
|
|
node$2.arguments = this$1.parseExprList(tt.parenR, false)
|
|
base = this$1.finishNode(node$2, "CallExpression")
|
|
} else if (this$1.type === tt.backQuote) {
|
|
var node$3 = this$1.startNodeAt(startPos, startLoc)
|
|
node$3.tag = base
|
|
node$3.quasi = this$1.parseTemplate()
|
|
base = this$1.finishNode(node$3, "TaggedTemplateExpression")
|
|
} else {
|
|
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) {
|
|
var node, canBeArrow = this.potentialArrowAt == this.start
|
|
switch (this.type) {
|
|
case tt._super:
|
|
if (!this.inFunction)
|
|
this.raise(this.start, "'super' outside of function or class")
|
|
|
|
case tt._this:
|
|
var type = this.type === tt._this ? "ThisExpression" : "Super"
|
|
node = this.startNode()
|
|
this.next()
|
|
return this.finishNode(node, type)
|
|
|
|
case tt.name:
|
|
var startPos = this.start, startLoc = this.startLoc
|
|
var id = this.parseIdent(this.type !== tt.name)
|
|
if (canBeArrow && !this.canInsertSemicolon() && this.eat(tt.arrow))
|
|
return this.parseArrowExpression(this.startNodeAt(startPos, startLoc), [id])
|
|
return id
|
|
|
|
case tt.regexp:
|
|
var value = this.value
|
|
node = this.parseLiteral(value.value)
|
|
node.regex = {pattern: value.pattern, flags: value.flags}
|
|
return node
|
|
|
|
case tt.num: case tt.string:
|
|
return this.parseLiteral(this.value)
|
|
|
|
case tt._null: case tt._true: case tt._false:
|
|
node = this.startNode()
|
|
node.value = this.type === tt._null ? null : this.type === tt._true
|
|
node.raw = this.type.keyword
|
|
this.next()
|
|
return this.finishNode(node, "Literal")
|
|
|
|
case tt.parenL:
|
|
return this.parseParenAndDistinguishExpression(canBeArrow)
|
|
|
|
case tt.bracketL:
|
|
node = this.startNode()
|
|
this.next()
|
|
node.elements = this.parseExprList(tt.bracketR, true, true, refDestructuringErrors)
|
|
return this.finishNode(node, "ArrayExpression")
|
|
|
|
case tt.braceL:
|
|
return this.parseObj(false, refDestructuringErrors)
|
|
|
|
case tt._function:
|
|
node = this.startNode()
|
|
this.next()
|
|
return this.parseFunction(node, false)
|
|
|
|
case tt._class:
|
|
return this.parseClass(this.startNode(), false)
|
|
|
|
case tt._new:
|
|
return this.parseNew()
|
|
|
|
case tt.backQuote:
|
|
return this.parseTemplate()
|
|
|
|
default:
|
|
this.unexpected()
|
|
}
|
|
}
|
|
|
|
pp$3.parseLiteral = function(value) {
|
|
var node = this.startNode()
|
|
node.value = value
|
|
node.raw = this.input.slice(this.start, this.end)
|
|
this.next()
|
|
return this.finishNode(node, "Literal")
|
|
}
|
|
|
|
pp$3.parseParenExpression = function() {
|
|
this.expect(tt.parenL)
|
|
var val = this.parseExpression()
|
|
this.expect(tt.parenR)
|
|
return val
|
|
}
|
|
|
|
pp$3.parseParenAndDistinguishExpression = function(canBeArrow) {
|
|
var this$1 = this;
|
|
|
|
var startPos = this.start, startLoc = this.startLoc, val
|
|
if (this.options.ecmaVersion >= 6) {
|
|
this.next()
|
|
|
|
var innerStartPos = this.start, innerStartLoc = this.startLoc
|
|
var exprList = [], first = true
|
|
var refDestructuringErrors = new DestructuringErrors, spreadStart, innerParenStart
|
|
while (this.type !== tt.parenR) {
|
|
first ? first = false : this$1.expect(tt.comma)
|
|
if (this$1.type === tt.ellipsis) {
|
|
spreadStart = this$1.start
|
|
exprList.push(this$1.parseParenItem(this$1.parseRest()))
|
|
break
|
|
} else {
|
|
if (this$1.type === tt.parenL && !innerParenStart) {
|
|
innerParenStart = this$1.start
|
|
}
|
|
exprList.push(this$1.parseMaybeAssign(false, refDestructuringErrors, this$1.parseParenItem))
|
|
}
|
|
}
|
|
var innerEndPos = this.start, innerEndLoc = this.startLoc
|
|
this.expect(tt.parenR)
|
|
|
|
if (canBeArrow && !this.canInsertSemicolon() && this.eat(tt.arrow)) {
|
|
this.checkPatternErrors(refDestructuringErrors, true)
|
|
if (innerParenStart) this.unexpected(innerParenStart)
|
|
return this.parseParenArrowList(startPos, startLoc, exprList)
|
|
}
|
|
|
|
if (!exprList.length) this.unexpected(this.lastTokStart)
|
|
if (spreadStart) this.unexpected(spreadStart)
|
|
this.checkExpressionErrors(refDestructuringErrors, true)
|
|
|
|
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() {
|
|
var node = this.startNode()
|
|
var meta = this.parseIdent(true)
|
|
if (this.options.ecmaVersion >= 6 && this.eat(tt.dot)) {
|
|
node.meta = meta
|
|
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 (!this.inFunction)
|
|
this.raiseRecoverable(node.start, "new.target can only be used in functions")
|
|
return this.finishNode(node, "MetaProperty")
|
|
}
|
|
var startPos = this.start, startLoc = this.startLoc
|
|
node.callee = this.parseSubscripts(this.parseExprAtom(), startPos, startLoc, true)
|
|
if (this.eat(tt.parenL)) node.arguments = this.parseExprList(tt.parenR, false)
|
|
else node.arguments = empty$1
|
|
return this.finishNode(node, "NewExpression")
|
|
}
|
|
|
|
// Parse template expression.
|
|
|
|
pp$3.parseTemplateElement = function() {
|
|
var elem = this.startNode()
|
|
elem.value = {
|
|
raw: this.input.slice(this.start, this.end).replace(/\r\n?/g, '\n'),
|
|
cooked: this.value
|
|
}
|
|
this.next()
|
|
elem.tail = this.type === tt.backQuote
|
|
return this.finishNode(elem, "TemplateElement")
|
|
}
|
|
|
|
pp$3.parseTemplate = function() {
|
|
var this$1 = this;
|
|
|
|
var node = this.startNode()
|
|
this.next()
|
|
node.expressions = []
|
|
var curElt = this.parseTemplateElement()
|
|
node.quasis = [curElt]
|
|
while (!curElt.tail) {
|
|
this$1.expect(tt.dollarBraceL)
|
|
node.expressions.push(this$1.parseExpression())
|
|
this$1.expect(tt.braceR)
|
|
node.quasis.push(curElt = this$1.parseTemplateElement())
|
|
}
|
|
this.next()
|
|
return this.finishNode(node, "TemplateLiteral")
|
|
}
|
|
|
|
// Parse an object literal or binding pattern.
|
|
|
|
pp$3.parseObj = function(isPattern, refDestructuringErrors) {
|
|
var this$1 = this;
|
|
|
|
var node = this.startNode(), first = true, propHash = {}
|
|
node.properties = []
|
|
this.next()
|
|
while (!this.eat(tt.braceR)) {
|
|
if (!first) {
|
|
this$1.expect(tt.comma)
|
|
if (this$1.afterTrailingComma(tt.braceR)) break
|
|
} else first = false
|
|
|
|
var prop = this$1.startNode(), isGenerator, startPos, startLoc
|
|
if (this$1.options.ecmaVersion >= 6) {
|
|
prop.method = false
|
|
prop.shorthand = false
|
|
if (isPattern || refDestructuringErrors) {
|
|
startPos = this$1.start
|
|
startLoc = this$1.startLoc
|
|
}
|
|
if (!isPattern)
|
|
isGenerator = this$1.eat(tt.star)
|
|
}
|
|
this$1.parsePropertyName(prop)
|
|
this$1.parsePropertyValue(prop, isPattern, isGenerator, startPos, startLoc, refDestructuringErrors)
|
|
this$1.checkPropClash(prop, propHash)
|
|
node.properties.push(this$1.finishNode(prop, "Property"))
|
|
}
|
|
return this.finishNode(node, isPattern ? "ObjectPattern" : "ObjectExpression")
|
|
}
|
|
|
|
pp$3.parsePropertyValue = function(prop, isPattern, isGenerator, startPos, startLoc, refDestructuringErrors) {
|
|
if (this.eat(tt.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 === tt.parenL) {
|
|
if (isPattern) this.unexpected()
|
|
prop.kind = "init"
|
|
prop.method = true
|
|
prop.value = this.parseMethod(isGenerator)
|
|
} else if (this.options.ecmaVersion >= 5 && !prop.computed && prop.key.type === "Identifier" &&
|
|
(prop.key.name === "get" || prop.key.name === "set") &&
|
|
(this.type != tt.comma && this.type != tt.braceR)) {
|
|
if (isGenerator || isPattern) 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")
|
|
}
|
|
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 (this.keywords.test(prop.key.name) ||
|
|
(this.strict ? this.reservedWordsStrictBind : this.reservedWords).test(prop.key.name) ||
|
|
(this.inGenerator && prop.key.name == "yield"))
|
|
this.raiseRecoverable(prop.key.start, "'" + prop.key.name + "' can not be used as shorthand property")
|
|
prop.kind = "init"
|
|
if (isPattern) {
|
|
prop.value = this.parseMaybeDefault(startPos, startLoc, prop.key)
|
|
} else if (this.type === tt.eq && refDestructuringErrors) {
|
|
if (!refDestructuringErrors.shorthandAssign)
|
|
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(tt.bracketL)) {
|
|
prop.computed = true
|
|
prop.key = this.parseMaybeAssign()
|
|
this.expect(tt.bracketR)
|
|
return prop.key
|
|
} else {
|
|
prop.computed = false
|
|
}
|
|
}
|
|
return prop.key = this.type === tt.num || this.type === tt.string ? this.parseExprAtom() : this.parseIdent(true)
|
|
}
|
|
|
|
// Initialize empty function node.
|
|
|
|
pp$3.initFunction = function(node) {
|
|
node.id = null
|
|
if (this.options.ecmaVersion >= 6) {
|
|
node.generator = false
|
|
node.expression = false
|
|
}
|
|
}
|
|
|
|
// Parse object or class method.
|
|
|
|
pp$3.parseMethod = function(isGenerator) {
|
|
var node = this.startNode(), oldInGen = this.inGenerator
|
|
this.inGenerator = isGenerator
|
|
this.initFunction(node)
|
|
this.expect(tt.parenL)
|
|
node.params = this.parseBindingList(tt.parenR, false, false)
|
|
if (this.options.ecmaVersion >= 6)
|
|
node.generator = isGenerator
|
|
this.parseFunctionBody(node, false)
|
|
this.inGenerator = oldInGen
|
|
return this.finishNode(node, "FunctionExpression")
|
|
}
|
|
|
|
// Parse arrow function expression with given parameters.
|
|
|
|
pp$3.parseArrowExpression = function(node, params) {
|
|
var oldInGen = this.inGenerator
|
|
this.inGenerator = false
|
|
this.initFunction(node)
|
|
node.params = this.toAssignableList(params, true)
|
|
this.parseFunctionBody(node, true)
|
|
this.inGenerator = oldInGen
|
|
return this.finishNode(node, "ArrowFunctionExpression")
|
|
}
|
|
|
|
// Parse function body and check parameters.
|
|
|
|
pp$3.parseFunctionBody = function(node, isArrowFunction) {
|
|
var isExpression = isArrowFunction && this.type !== tt.braceL
|
|
|
|
if (isExpression) {
|
|
node.body = this.parseMaybeAssign()
|
|
node.expression = true
|
|
} else {
|
|
// Start a new scope with regard to labels and the `inFunction`
|
|
// flag (restore them to their old value afterwards).
|
|
var oldInFunc = this.inFunction, oldLabels = this.labels
|
|
this.inFunction = true; this.labels = []
|
|
node.body = this.parseBlock(true)
|
|
node.expression = false
|
|
this.inFunction = oldInFunc; this.labels = oldLabels
|
|
}
|
|
|
|
// 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`.
|
|
var useStrict = (!isExpression && node.body.body.length && this.isUseStrict(node.body.body[0])) ? node.body.body[0] : null;
|
|
if (this.strict || useStrict) {
|
|
var oldStrict = this.strict
|
|
this.strict = true
|
|
if (node.id)
|
|
this.checkLVal(node.id, true)
|
|
this.checkParams(node, useStrict)
|
|
this.strict = oldStrict
|
|
} else if (isArrowFunction) {
|
|
this.checkParams(node, useStrict)
|
|
}
|
|
}
|
|
|
|
// Checks function params for various disallowed patterns such as using "eval"
|
|
// or "arguments" and duplicate parameters.
|
|
|
|
pp$3.checkParams = function(node, useStrict) {
|
|
var this$1 = this;
|
|
|
|
var nameHash = {}
|
|
for (var i = 0; i < node.params.length; i++) {
|
|
if (useStrict && this$1.options.ecmaVersion >= 7 && node.params[i].type !== "Identifier")
|
|
this$1.raiseRecoverable(useStrict.start, "Illegal 'use strict' directive in function with non-simple parameter list");
|
|
this$1.checkLVal(node.params[i], true, 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 this$1 = this;
|
|
|
|
var elts = [], first = true
|
|
while (!this.eat(close)) {
|
|
if (!first) {
|
|
this$1.expect(tt.comma)
|
|
if (allowTrailingComma && this$1.afterTrailingComma(close)) break
|
|
} else first = false
|
|
|
|
var elt
|
|
if (allowEmpty && this$1.type === tt.comma)
|
|
elt = null
|
|
else if (this$1.type === tt.ellipsis) {
|
|
elt = this$1.parseSpread(refDestructuringErrors)
|
|
if (this$1.type === tt.comma && refDestructuringErrors && !refDestructuringErrors.trailingComma) {
|
|
refDestructuringErrors.trailingComma = this$1.lastTokStart
|
|
}
|
|
} else
|
|
elt = this$1.parseMaybeAssign(false, refDestructuringErrors)
|
|
elts.push(elt)
|
|
}
|
|
return elts
|
|
}
|
|
|
|
// 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) {
|
|
var node = this.startNode()
|
|
if (liberal && this.options.allowReserved == "never") liberal = false
|
|
if (this.type === tt.name) {
|
|
if (!liberal && (this.strict ? this.reservedWordsStrict : this.reservedWords).test(this.value) &&
|
|
(this.options.ecmaVersion >= 6 ||
|
|
this.input.slice(this.start, this.end).indexOf("\\") == -1))
|
|
this.raiseRecoverable(this.start, "The keyword '" + this.value + "' is reserved")
|
|
if (!liberal && this.inGenerator && this.value === "yield")
|
|
this.raiseRecoverable(this.start, "Can not use 'yield' as identifier inside a generator")
|
|
node.name = this.value
|
|
} else if (liberal && this.type.keyword) {
|
|
node.name = this.type.keyword
|
|
} else {
|
|
this.unexpected()
|
|
}
|
|
this.next()
|
|
return this.finishNode(node, "Identifier")
|
|
}
|
|
|
|
// Parses yield expression inside generator.
|
|
|
|
pp$3.parseYield = function() {
|
|
var node = this.startNode()
|
|
this.next()
|
|
if (this.type == tt.semi || this.canInsertSemicolon() || (this.type != tt.star && !this.type.startsExpr)) {
|
|
node.delegate = false
|
|
node.argument = null
|
|
} else {
|
|
node.delegate = this.eat(tt.star)
|
|
node.argument = this.parseMaybeAssign()
|
|
}
|
|
return this.finishNode(node, "YieldExpression")
|
|
}
|
|
|
|
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 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$5 = Parser.prototype
|
|
|
|
pp$5.startNode = function() {
|
|
return new Node(this, this.start, this.startLoc)
|
|
}
|
|
|
|
pp$5.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$5.finishNode = function(node, type) {
|
|
return finishNodeAt.call(this, node, type, this.lastTokEnd, this.lastTokEndLoc)
|
|
}
|
|
|
|
// Finish node at given position
|
|
|
|
pp$5.finishNodeAt = function(node, type, pos, loc) {
|
|
return finishNodeAt.call(this, node, type, pos, loc)
|
|
}
|
|
|
|
var TokContext = function TokContext(token, isExpr, preserveSpace, override) {
|
|
this.token = token
|
|
this.isExpr = !!isExpr
|
|
this.preserveSpace = !!preserveSpace
|
|
this.override = override
|
|
};
|
|
|
|
var types = {
|
|
b_stat: new TokContext("{", false),
|
|
b_expr: new TokContext("{", true),
|
|
b_tmpl: new TokContext("${", true),
|
|
p_stat: new TokContext("(", false),
|
|
p_expr: new TokContext("(", true),
|
|
q_tmpl: new TokContext("`", true, true, function (p) { return p.readTmplToken(); }),
|
|
f_expr: new TokContext("function", true)
|
|
}
|
|
|
|
var pp$6 = Parser.prototype
|
|
|
|
pp$6.initialContext = function() {
|
|
return [types.b_stat]
|
|
}
|
|
|
|
pp$6.braceIsBlock = function(prevType) {
|
|
if (prevType === tt.colon) {
|
|
var parent = this.curContext()
|
|
if (parent === types.b_stat || parent === types.b_expr)
|
|
return !parent.isExpr
|
|
}
|
|
if (prevType === tt._return)
|
|
return lineBreak.test(this.input.slice(this.lastTokEnd, this.start))
|
|
if (prevType === tt._else || prevType === tt.semi || prevType === tt.eof || prevType === tt.parenR)
|
|
return true
|
|
if (prevType == tt.braceL)
|
|
return this.curContext() === types.b_stat
|
|
return !this.exprAllowed
|
|
}
|
|
|
|
pp$6.updateContext = function(prevType) {
|
|
var update, type = this.type
|
|
if (type.keyword && prevType == tt.dot)
|
|
this.exprAllowed = false
|
|
else if (update = type.updateContext)
|
|
update.call(this, prevType)
|
|
else
|
|
this.exprAllowed = type.beforeExpr
|
|
}
|
|
|
|
// Token-specific context update code
|
|
|
|
tt.parenR.updateContext = tt.braceR.updateContext = function() {
|
|
if (this.context.length == 1) {
|
|
this.exprAllowed = true
|
|
return
|
|
}
|
|
var out = this.context.pop()
|
|
if (out === types.b_stat && this.curContext() === types.f_expr) {
|
|
this.context.pop()
|
|
this.exprAllowed = false
|
|
} else if (out === types.b_tmpl) {
|
|
this.exprAllowed = true
|
|
} else {
|
|
this.exprAllowed = !out.isExpr
|
|
}
|
|
}
|
|
|
|
tt.braceL.updateContext = function(prevType) {
|
|
this.context.push(this.braceIsBlock(prevType) ? types.b_stat : types.b_expr)
|
|
this.exprAllowed = true
|
|
}
|
|
|
|
tt.dollarBraceL.updateContext = function() {
|
|
this.context.push(types.b_tmpl)
|
|
this.exprAllowed = true
|
|
}
|
|
|
|
tt.parenL.updateContext = function(prevType) {
|
|
var statementParens = prevType === tt._if || prevType === tt._for || prevType === tt._with || prevType === tt._while
|
|
this.context.push(statementParens ? types.p_stat : types.p_expr)
|
|
this.exprAllowed = true
|
|
}
|
|
|
|
tt.incDec.updateContext = function() {
|
|
// tokExprAllowed stays unchanged
|
|
}
|
|
|
|
tt._function.updateContext = function(prevType) {
|
|
if (prevType.beforeExpr && prevType !== tt.semi && prevType !== tt._else &&
|
|
!((prevType === tt.colon || prevType === tt.braceL) && this.curContext() === types.b_stat))
|
|
this.context.push(types.f_expr)
|
|
this.exprAllowed = false
|
|
}
|
|
|
|
tt.backQuote.updateContext = function() {
|
|
if (this.curContext() === types.q_tmpl)
|
|
this.context.pop()
|
|
else
|
|
this.context.push(types.q_tmpl)
|
|
this.exprAllowed = false
|
|
}
|
|
|
|
// 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$7 = Parser.prototype
|
|
|
|
// Are we running under Rhino?
|
|
var isRhino = typeof Packages == "object" && Object.prototype.toString.call(Packages) == "[object JavaPackage]"
|
|
|
|
// Move to the next token
|
|
|
|
pp$7.next = function() {
|
|
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$7.getToken = function() {
|
|
this.next()
|
|
return new Token(this)
|
|
}
|
|
|
|
// If we're in an ES6 environment, make parsers iterable
|
|
if (typeof Symbol !== "undefined")
|
|
pp$7[Symbol.iterator] = function () {
|
|
var self = this
|
|
return {next: function () {
|
|
var token = self.getToken()
|
|
return {
|
|
done: token.type === tt.eof,
|
|
value: token
|
|
}
|
|
}}
|
|
}
|
|
|
|
// Toggle strict mode. Re-reads the next number or string to please
|
|
// pedantic tests (`"use strict"; 010;` should fail).
|
|
|
|
pp$7.setStrict = function(strict) {
|
|
var this$1 = this;
|
|
|
|
this.strict = strict
|
|
if (this.type !== tt.num && this.type !== tt.string) return
|
|
this.pos = this.start
|
|
if (this.options.locations) {
|
|
while (this.pos < this.lineStart) {
|
|
this$1.lineStart = this$1.input.lastIndexOf("\n", this$1.lineStart - 2) + 1
|
|
--this$1.curLine
|
|
}
|
|
}
|
|
this.nextToken()
|
|
}
|
|
|
|
pp$7.curContext = function() {
|
|
return this.context[this.context.length - 1]
|
|
}
|
|
|
|
// Read a single token, updating the parser object's token-related
|
|
// properties.
|
|
|
|
pp$7.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(tt.eof)
|
|
|
|
if (curContext.override) return curContext.override(this)
|
|
else this.readToken(this.fullCharCodeAtPos())
|
|
}
|
|
|
|
pp$7.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$7.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$7.skipBlockComment = function() {
|
|
var this$1 = this;
|
|
|
|
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$1.curLine
|
|
this$1.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$7.skipLineComment = function(startSkip) {
|
|
var this$1 = this;
|
|
|
|
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 && ch !== 10 && ch !== 13 && ch !== 8232 && ch !== 8233) {
|
|
++this$1.pos
|
|
ch = this$1.input.charCodeAt(this$1.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$7.skipSpace = function() {
|
|
var this$1 = this;
|
|
|
|
loop: while (this.pos < this.input.length) {
|
|
var ch = this$1.input.charCodeAt(this$1.pos)
|
|
switch (ch) {
|
|
case 32: case 160: // ' '
|
|
++this$1.pos
|
|
break
|
|
case 13:
|
|
if (this$1.input.charCodeAt(this$1.pos + 1) === 10) {
|
|
++this$1.pos
|
|
}
|
|
case 10: case 8232: case 8233:
|
|
++this$1.pos
|
|
if (this$1.options.locations) {
|
|
++this$1.curLine
|
|
this$1.lineStart = this$1.pos
|
|
}
|
|
break
|
|
case 47: // '/'
|
|
switch (this$1.input.charCodeAt(this$1.pos + 1)) {
|
|
case 42: // '*'
|
|
this$1.skipBlockComment()
|
|
break
|
|
case 47:
|
|
this$1.skipLineComment(2)
|
|
break
|
|
default:
|
|
break loop
|
|
}
|
|
break
|
|
default:
|
|
if (ch > 8 && ch < 14 || ch >= 5760 && nonASCIIwhitespace.test(String.fromCharCode(ch))) {
|
|
++this$1.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$7.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$7.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(tt.ellipsis)
|
|
} else {
|
|
++this.pos
|
|
return this.finishToken(tt.dot)
|
|
}
|
|
}
|
|
|
|
pp$7.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(tt.assign, 2)
|
|
return this.finishOp(tt.slash, 1)
|
|
}
|
|
|
|
pp$7.readToken_mult_modulo_exp = function(code) { // '%*'
|
|
var next = this.input.charCodeAt(this.pos + 1)
|
|
var size = 1
|
|
var tokentype = code === 42 ? tt.star : tt.modulo
|
|
|
|
// exponentiation operator ** and **=
|
|
if (this.options.ecmaVersion >= 7 && next === 42) {
|
|
++size
|
|
tokentype = tt.starstar
|
|
next = this.input.charCodeAt(this.pos + 2)
|
|
}
|
|
|
|
if (next === 61) return this.finishOp(tt.assign, size + 1)
|
|
return this.finishOp(tokentype, size)
|
|
}
|
|
|
|
pp$7.readToken_pipe_amp = function(code) { // '|&'
|
|
var next = this.input.charCodeAt(this.pos + 1)
|
|
if (next === code) return this.finishOp(code === 124 ? tt.logicalOR : tt.logicalAND, 2)
|
|
if (next === 61) return this.finishOp(tt.assign, 2)
|
|
return this.finishOp(code === 124 ? tt.bitwiseOR : tt.bitwiseAND, 1)
|
|
}
|
|
|
|
pp$7.readToken_caret = function() { // '^'
|
|
var next = this.input.charCodeAt(this.pos + 1)
|
|
if (next === 61) return this.finishOp(tt.assign, 2)
|
|
return this.finishOp(tt.bitwiseXOR, 1)
|
|
}
|
|
|
|
pp$7.readToken_plus_min = function(code) { // '+-'
|
|
var next = this.input.charCodeAt(this.pos + 1)
|
|
if (next === code) {
|
|
if (next == 45 && this.input.charCodeAt(this.pos + 2) == 62 &&
|
|
lineBreak.test(this.input.slice(this.lastTokEnd, this.pos))) {
|
|
// A `-->` line comment
|
|
this.skipLineComment(3)
|
|
this.skipSpace()
|
|
return this.nextToken()
|
|
}
|
|
return this.finishOp(tt.incDec, 2)
|
|
}
|
|
if (next === 61) return this.finishOp(tt.assign, 2)
|
|
return this.finishOp(tt.plusMin, 1)
|
|
}
|
|
|
|
pp$7.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(tt.assign, size + 1)
|
|
return this.finishOp(tt.bitShift, size)
|
|
}
|
|
if (next == 33 && code == 60 && this.input.charCodeAt(this.pos + 2) == 45 &&
|
|
this.input.charCodeAt(this.pos + 3) == 45) {
|
|
if (this.inModule) this.unexpected()
|
|
// `<!--`, 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(tt.relational, size)
|
|
}
|
|
|
|
pp$7.readToken_eq_excl = function(code) { // '=!'
|
|
var next = this.input.charCodeAt(this.pos + 1)
|
|
if (next === 61) return this.finishOp(tt.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(tt.arrow)
|
|
}
|
|
return this.finishOp(code === 61 ? tt.eq : tt.prefix, 1)
|
|
}
|
|
|
|
pp$7.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(tt.parenL)
|
|
case 41: ++this.pos; return this.finishToken(tt.parenR)
|
|
case 59: ++this.pos; return this.finishToken(tt.semi)
|
|
case 44: ++this.pos; return this.finishToken(tt.comma)
|
|
case 91: ++this.pos; return this.finishToken(tt.bracketL)
|
|
case 93: ++this.pos; return this.finishToken(tt.bracketR)
|
|
case 123: ++this.pos; return this.finishToken(tt.braceL)
|
|
case 125: ++this.pos; return this.finishToken(tt.braceR)
|
|
case 58: ++this.pos; return this.finishToken(tt.colon)
|
|
case 63: ++this.pos; return this.finishToken(tt.question)
|
|
|
|
case 96: // '`'
|
|
if (this.options.ecmaVersion < 6) break
|
|
++this.pos
|
|
return this.finishToken(tt.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 126: // '~'
|
|
return this.finishOp(tt.prefix, 1)
|
|
}
|
|
|
|
this.raise(this.pos, "Unexpected character '" + codePointToString(code) + "'")
|
|
}
|
|
|
|
pp$7.finishOp = function(type, size) {
|
|
var str = this.input.slice(this.pos, this.pos + size)
|
|
this.pos += size
|
|
return this.finishToken(type, str)
|
|
}
|
|
|
|
// Parse a regular expression. Some context-awareness is necessary,
|
|
// since a '/' inside a '[]' set does not end the expression.
|
|
|
|
function tryCreateRegexp(src, flags, throwErrorAt, parser) {
|
|
try {
|
|
return new RegExp(src, flags)
|
|
} catch (e) {
|
|
if (throwErrorAt !== undefined) {
|
|
if (e instanceof SyntaxError) parser.raise(throwErrorAt, "Error parsing regular expression: " + e.message)
|
|
throw e
|
|
}
|
|
}
|
|
}
|
|
|
|
var regexpUnicodeSupport = !!tryCreateRegexp("\uffff", "u")
|
|
|
|
pp$7.readRegexp = function() {
|
|
var this$1 = this;
|
|
|
|
var escaped, inClass, start = this.pos
|
|
for (;;) {
|
|
if (this$1.pos >= this$1.input.length) this$1.raise(start, "Unterminated regular expression")
|
|
var ch = this$1.input.charAt(this$1.pos)
|
|
if (lineBreak.test(ch)) this$1.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$1.pos
|
|
}
|
|
var content = this.input.slice(start, this.pos)
|
|
++this.pos
|
|
// Need to use `readWord1` because '\uXXXX' sequences are allowed
|
|
// here (don't ask).
|
|
var mods = this.readWord1()
|
|
var tmp = content, tmpFlags = ""
|
|
if (mods) {
|
|
var validFlags = /^[gim]*$/
|
|
if (this.options.ecmaVersion >= 6) validFlags = /^[gimuy]*$/
|
|
if (!validFlags.test(mods)) this.raise(start, "Invalid regular expression flag")
|
|
if (mods.indexOf("u") >= 0) {
|
|
if (regexpUnicodeSupport) {
|
|
tmpFlags = "u"
|
|
} else {
|
|
// Replace each astral symbol and every Unicode escape sequence that
|
|
// possibly represents an astral symbol or a paired surrogate with a
|
|
// single ASCII symbol to avoid throwing on regular expressions that
|
|
// are only valid in combination with the `/u` flag.
|
|
// Note: replacing with the ASCII symbol `x` might cause false
|
|
// negatives in unlikely scenarios. For example, `[\u{61}-b]` is a
|
|
// perfectly valid pattern that is equivalent to `[a-b]`, but it would
|
|
// be replaced by `[x-b]` which throws an error.
|
|
tmp = tmp.replace(/\\u\{([0-9a-fA-F]+)\}/g, function (_match, code, offset) {
|
|
code = Number("0x" + code)
|
|
if (code > 0x10FFFF) this$1.raise(start + offset + 3, "Code point out of bounds")
|
|
return "x"
|
|
})
|
|
tmp = tmp.replace(/\\u([a-fA-F0-9]{4})|[\uD800-\uDBFF][\uDC00-\uDFFF]/g, "x")
|
|
tmpFlags = tmpFlags.replace("u", "")
|
|
}
|
|
}
|
|
}
|
|
// Detect invalid regular expressions.
|
|
var value = null
|
|
// Rhino's regular expression parser is flaky and throws uncatchable exceptions,
|
|
// so don't do detection if we are running under Rhino
|
|
if (!isRhino) {
|
|
tryCreateRegexp(tmp, tmpFlags, start, this)
|
|
// Get a regular expression object for this pattern-flag pair, or `null` in
|
|
// case the current environment doesn't support the flags it uses.
|
|
value = tryCreateRegexp(content, mods)
|
|
}
|
|
return this.finishToken(tt.regexp, {pattern: content, flags: mods, 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$7.readInt = function(radix, len) {
|
|
var this$1 = this;
|
|
|
|
var start = this.pos, total = 0
|
|
for (var i = 0, e = len == null ? Infinity : len; i < e; ++i) {
|
|
var code = this$1.input.charCodeAt(this$1.pos), val
|
|
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
|
|
++this$1.pos
|
|
total = total * radix + val
|
|
}
|
|
if (this.pos === start || len != null && this.pos - start !== len) return null
|
|
|
|
return total
|
|
}
|
|
|
|
pp$7.readRadixNumber = function(radix) {
|
|
this.pos += 2 // 0x
|
|
var val = this.readInt(radix)
|
|
if (val == null) this.raise(this.start + 2, "Expected number in radix " + radix)
|
|
if (isIdentifierStart(this.fullCharCodeAtPos())) this.raise(this.pos, "Identifier directly after number")
|
|
return this.finishToken(tt.num, val)
|
|
}
|
|
|
|
// Read an integer, octal integer, or floating-point number.
|
|
|
|
pp$7.readNumber = function(startsWithDot) {
|
|
var start = this.pos, isFloat = false, octal = this.input.charCodeAt(this.pos) === 48
|
|
if (!startsWithDot && this.readInt(10) === null) this.raise(start, "Invalid number")
|
|
var next = this.input.charCodeAt(this.pos)
|
|
if (next === 46) { // '.'
|
|
++this.pos
|
|
this.readInt(10)
|
|
isFloat = true
|
|
next = this.input.charCodeAt(this.pos)
|
|
}
|
|
if (next === 69 || next === 101) { // 'eE'
|
|
next = this.input.charCodeAt(++this.pos)
|
|
if (next === 43 || next === 45) ++this.pos // '+-'
|
|
if (this.readInt(10) === null) this.raise(start, "Invalid number")
|
|
isFloat = true
|
|
}
|
|
if (isIdentifierStart(this.fullCharCodeAtPos())) this.raise(this.pos, "Identifier directly after number")
|
|
|
|
var str = this.input.slice(start, this.pos), val
|
|
if (isFloat) val = parseFloat(str)
|
|
else if (!octal || str.length === 1) val = parseInt(str, 10)
|
|
else if (/[89]/.test(str) || this.strict) this.raise(start, "Invalid number")
|
|
else val = parseInt(str, 8)
|
|
return this.finishToken(tt.num, val)
|
|
}
|
|
|
|
// Read a string value, interpreting backslash-escapes.
|
|
|
|
pp$7.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.raise(codePos, "Code point out of bounds")
|
|
} else {
|
|
code = this.readHexChar(4)
|
|
}
|
|
return code
|
|
}
|
|
|
|
function codePointToString(code) {
|
|
// UTF-16 Decoding
|
|
if (code <= 0xFFFF) return String.fromCharCode(code)
|
|
code -= 0x10000
|
|
return String.fromCharCode((code >> 10) + 0xD800, (code & 1023) + 0xDC00)
|
|
}
|
|
|
|
pp$7.readString = function(quote) {
|
|
var this$1 = this;
|
|
|
|
var out = "", chunkStart = ++this.pos
|
|
for (;;) {
|
|
if (this$1.pos >= this$1.input.length) this$1.raise(this$1.start, "Unterminated string constant")
|
|
var ch = this$1.input.charCodeAt(this$1.pos)
|
|
if (ch === quote) break
|
|
if (ch === 92) { // '\'
|
|
out += this$1.input.slice(chunkStart, this$1.pos)
|
|
out += this$1.readEscapedChar(false)
|
|
chunkStart = this$1.pos
|
|
} else {
|
|
if (isNewLine(ch)) this$1.raise(this$1.start, "Unterminated string constant")
|
|
++this$1.pos
|
|
}
|
|
}
|
|
out += this.input.slice(chunkStart, this.pos++)
|
|
return this.finishToken(tt.string, out)
|
|
}
|
|
|
|
// Reads template string tokens.
|
|
|
|
pp$7.readTmplToken = function() {
|
|
var this$1 = this;
|
|
|
|
var out = "", chunkStart = this.pos
|
|
for (;;) {
|
|
if (this$1.pos >= this$1.input.length) this$1.raise(this$1.start, "Unterminated template")
|
|
var ch = this$1.input.charCodeAt(this$1.pos)
|
|
if (ch === 96 || ch === 36 && this$1.input.charCodeAt(this$1.pos + 1) === 123) { // '`', '${'
|
|
if (this$1.pos === this$1.start && this$1.type === tt.template) {
|
|
if (ch === 36) {
|
|
this$1.pos += 2
|
|
return this$1.finishToken(tt.dollarBraceL)
|
|
} else {
|
|
++this$1.pos
|
|
return this$1.finishToken(tt.backQuote)
|
|
}
|
|
}
|
|
out += this$1.input.slice(chunkStart, this$1.pos)
|
|
return this$1.finishToken(tt.template, out)
|
|
}
|
|
if (ch === 92) { // '\'
|
|
out += this$1.input.slice(chunkStart, this$1.pos)
|
|
out += this$1.readEscapedChar(true)
|
|
chunkStart = this$1.pos
|
|
} else if (isNewLine(ch)) {
|
|
out += this$1.input.slice(chunkStart, this$1.pos)
|
|
++this$1.pos
|
|
switch (ch) {
|
|
case 13:
|
|
if (this$1.input.charCodeAt(this$1.pos) === 10) ++this$1.pos
|
|
case 10:
|
|
out += "\n"
|
|
break
|
|
default:
|
|
out += String.fromCharCode(ch)
|
|
break
|
|
}
|
|
if (this$1.options.locations) {
|
|
++this$1.curLine
|
|
this$1.lineStart = this$1.pos
|
|
}
|
|
chunkStart = this$1.pos
|
|
} else {
|
|
++this$1.pos
|
|
}
|
|
}
|
|
}
|
|
|
|
// Used to read escaped characters
|
|
|
|
pp$7.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(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 ""
|
|
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)
|
|
}
|
|
if (octalStr !== "0" && (this.strict || inTemplate)) {
|
|
this.raise(this.pos - 2, "Octal literal in strict mode")
|
|
}
|
|
this.pos += octalStr.length - 1
|
|
return String.fromCharCode(octal)
|
|
}
|
|
return String.fromCharCode(ch)
|
|
}
|
|
}
|
|
|
|
// Used to read character escape sequences ('\x', '\u', '\U').
|
|
|
|
pp$7.readHexChar = function(len) {
|
|
var codePos = this.pos
|
|
var n = this.readInt(16, len)
|
|
if (n === null) this.raise(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$7.readWord1 = function() {
|
|
var this$1 = this;
|
|
|
|
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$1.fullCharCodeAtPos()
|
|
if (isIdentifierChar(ch, astral)) {
|
|
this$1.pos += ch <= 0xffff ? 1 : 2
|
|
} else if (ch === 92) { // "\"
|
|
this$1.containsEsc = true
|
|
word += this$1.input.slice(chunkStart, this$1.pos)
|
|
var escStart = this$1.pos
|
|
if (this$1.input.charCodeAt(++this$1.pos) != 117) // "u"
|
|
this$1.raise(this$1.pos, "Expecting Unicode escape sequence \\uXXXX")
|
|
++this$1.pos
|
|
var esc = this$1.readCodePoint()
|
|
if (!(first ? isIdentifierStart : isIdentifierChar)(esc, astral))
|
|
this$1.raise(escStart, "Invalid Unicode escape")
|
|
word += codePointToString(esc)
|
|
chunkStart = this$1.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$7.readWord = function() {
|
|
var word = this.readWord1()
|
|
var type = tt.name
|
|
if ((this.options.ecmaVersion >= 6 || !this.containsEsc) && this.keywords.test(word))
|
|
type = keywordTypes[word]
|
|
return this.finishToken(type, word)
|
|
}
|
|
|
|
var version = "3.3.0"
|
|
|
|
// 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 new Parser(options, input).parse()
|
|
}
|
|
|
|
// 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) {
|
|
var p = new Parser(options, input, pos)
|
|
p.nextToken()
|
|
return p.parseExpression()
|
|
}
|
|
|
|
// Acorn is organized as a tokenizer and a recursive-descent parser.
|
|
// The `tokenizer` export provides an interface to the tokenizer.
|
|
|
|
function tokenizer(input, options) {
|
|
return new Parser(options, input)
|
|
}
|
|
|
|
export { version, parse, parseExpressionAt, tokenizer, Parser, plugins, defaultOptions, Position, SourceLocation, getLineInfo, Node, TokenType, tt as tokTypes, TokContext, types as tokContexts, isIdentifierChar, isIdentifierStart, Token, isNewLine, lineBreak, lineBreakG }; |