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June 22, 2012 15:02
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basil - bridging ASI and layout
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| // basil (bridging ASI and layout) | |
| // | |
| // unfinished sketch; Claus Reinke 2012 | |
| // | |
| // $ node basil.js sample.js | |
| // ASI at line 5(2), before indented line 6(8) | |
| // no ASI at line 12(2), before non-indented line 13(2) | |
| // ASI at line 25(2) before indented line 26(11) | |
| // no ASI at line 35(2), before non-indented line 36(2) | |
| // no ASI at line 39(2), before non-indented line 40(2) | |
| // ASI at line 43(2), before indented line 44(4) | |
| // no ASI at line 50(2), before non-indented line 51(2) | |
| // | |
| // $ node basil.js sample.js --multiline_warnings | |
| // ASI at line 5(2), before indented line 6(8) | |
| // no ASI at line 12(2), before non-indented line 13(2) | |
| // multiline VariableDeclaration 12(2), not indented: line 13(2) | |
| // multiline VariableDeclaration 21(2), not indented: line 22(2) | |
| // multiline VariableDeclaration 23(2), not indented: line 24(2) | |
| // ASI at line 25(2) before indented line 26(11) | |
| // no ASI at line 35(2), before non-indented line 36(2) | |
| // multiline IfStatement 35(2), not indented: line 36(2) | |
| // no ASI at line 39(2), before non-indented line 40(2) | |
| // multiline IfStatement 39(2), not indented: line 40(2) | |
| // ASI at line 43(2), before indented line 44(4) | |
| // multiline ExpressionStatement 46(2), not indented: line 48(2) | |
| // no ASI at line 50(2), before non-indented line 51(2) | |
| // multiline WhileStatement 50(2), not indented: line 51(2)-line 53(2) | |
| // | |
| // | |
| fs = require("fs"); | |
| util = require("util"); | |
| esprima = require("./esprima.js"); | |
| function flag(f) { return process.argv.indexOf(f)>-1 } | |
| fs.readFile(process.argv[2],'utf8',function(err,source){ | |
| var result = esprima.parse(source | |
| ,{asi:flag("--asi") | |
| ,multiline_warnings:flag("--multiline_warnings") | |
| ,loc:true}); | |
| if (flag('--ast')) | |
| console.log(util.inspect(result,false,null)) | |
| }); |
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| /* | |
| Copyright (C) 2012 Ariya Hidayat <[email protected]> | |
| Copyright (C) 2012 Mathias Bynens <[email protected]> | |
| Copyright (C) 2012 Joost-Wim Boekesteijn <[email protected]> | |
| Copyright (C) 2012 Kris Kowal <[email protected]> | |
| Copyright (C) 2012 Yusuke Suzuki <[email protected]> | |
| Copyright (C) 2012 Arpad Borsos <[email protected]> | |
| Copyright (C) 2011 Ariya Hidayat <[email protected]> | |
| Redistribution and use in source and binary forms, with or without | |
| modification, are permitted provided that the following conditions are met: | |
| * Redistributions of source code must retain the above copyright | |
| notice, this list of conditions and the following disclaimer. | |
| * Redistributions in binary form must reproduce the above copyright | |
| notice, this list of conditions and the following disclaimer in the | |
| documentation and/or other materials provided with the distribution. | |
| THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" | |
| AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
| ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY | |
| DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES | |
| (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | |
| LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND | |
| ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
| (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
| THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| */ | |
| /*jslint bitwise:true plusplus:true */ | |
| /*global esprima:true, exports:true, | |
| throwError: true, createLiteral: true, generateStatement: true, | |
| parseAssignmentExpression: true, parseBlock: true, parseExpression: true, | |
| parseFunctionDeclaration: true, parseFunctionExpression: true, | |
| parseFunctionSourceElements: true, parseVariableIdentifier: true, | |
| parseLeftHandSideExpression: true, | |
| parseStatement: true, parseSourceElement: true */ | |
| (function (exports) { | |
| 'use strict'; | |
| var Token, | |
| TokenName, | |
| Syntax, | |
| PropertyKind, | |
| Messages, | |
| Regex, | |
| source, | |
| strict, | |
| index, | |
| lineNumber, | |
| lineStart, | |
| indents = [], | |
| asi = [], | |
| length, | |
| buffer, | |
| state, | |
| extra; | |
| Token = { | |
| BooleanLiteral: 1, | |
| EOF: 2, | |
| Identifier: 3, | |
| Keyword: 4, | |
| NullLiteral: 5, | |
| NumericLiteral: 6, | |
| Punctuator: 7, | |
| StringLiteral: 8 | |
| }; | |
| TokenName = {}; | |
| TokenName[Token.BooleanLiteral] = 'Boolean'; | |
| TokenName[Token.EOF] = '<end>'; | |
| TokenName[Token.Identifier] = 'Identifier'; | |
| TokenName[Token.Keyword] = 'Keyword'; | |
| TokenName[Token.NullLiteral] = 'Null'; | |
| TokenName[Token.NumericLiteral] = 'Numeric'; | |
| TokenName[Token.Punctuator] = 'Punctuator'; | |
| TokenName[Token.StringLiteral] = 'String'; | |
| Syntax = { | |
| AssignmentExpression: 'AssignmentExpression', | |
| ArrayExpression: 'ArrayExpression', | |
| BlockStatement: 'BlockStatement', | |
| BinaryExpression: 'BinaryExpression', | |
| BreakStatement: 'BreakStatement', | |
| CallExpression: 'CallExpression', | |
| CatchClause: 'CatchClause', | |
| ConditionalExpression: 'ConditionalExpression', | |
| ContinueStatement: 'ContinueStatement', | |
| DoWhileStatement: 'DoWhileStatement', | |
| DebuggerStatement: 'DebuggerStatement', | |
| EmptyStatement: 'EmptyStatement', | |
| ExpressionStatement: 'ExpressionStatement', | |
| ForStatement: 'ForStatement', | |
| ForInStatement: 'ForInStatement', | |
| FunctionDeclaration: 'FunctionDeclaration', | |
| FunctionExpression: 'FunctionExpression', | |
| Identifier: 'Identifier', | |
| IfStatement: 'IfStatement', | |
| Literal: 'Literal', | |
| LabeledStatement: 'LabeledStatement', | |
| LogicalExpression: 'LogicalExpression', | |
| MemberExpression: 'MemberExpression', | |
| NewExpression: 'NewExpression', | |
| ObjectExpression: 'ObjectExpression', | |
| Program: 'Program', | |
| Property: 'Property', | |
| ReturnStatement: 'ReturnStatement', | |
| SequenceExpression: 'SequenceExpression', | |
| SwitchStatement: 'SwitchStatement', | |
| SwitchCase: 'SwitchCase', | |
| ThisExpression: 'ThisExpression', | |
| ThrowStatement: 'ThrowStatement', | |
| TryStatement: 'TryStatement', | |
| UnaryExpression: 'UnaryExpression', | |
| UpdateExpression: 'UpdateExpression', | |
| VariableDeclaration: 'VariableDeclaration', | |
| VariableDeclarator: 'VariableDeclarator', | |
| WhileStatement: 'WhileStatement', | |
| WithStatement: 'WithStatement' | |
| }; | |
| PropertyKind = { | |
| Data: 1, | |
| Get: 2, | |
| Set: 4 | |
| }; | |
| // Error messages should be identical to V8. | |
| Messages = { | |
| UnexpectedToken: 'Unexpected token %0', | |
| UnexpectedNumber: 'Unexpected number', | |
| UnexpectedString: 'Unexpected string', | |
| UnexpectedIdentifier: 'Unexpected identifier', | |
| UnexpectedReserved: 'Unexpected reserved word', | |
| UnexpectedEOS: 'Unexpected end of input', | |
| NewlineAfterThrow: 'Illegal newline after throw', | |
| InvalidRegExp: 'Invalid regular expression', | |
| UnterminatedRegExp: 'Invalid regular expression: missing /', | |
| InvalidLHSInAssignment: 'Invalid left-hand side in assignment', | |
| InvalidLHSInForIn: 'Invalid left-hand side in for-in', | |
| NoCatchOrFinally: 'Missing catch or finally after try', | |
| UnknownLabel: 'Undefined label \'%0\'', | |
| Redeclaration: '%0 \'%1\' has already been declared', | |
| IllegalContinue: 'Illegal continue statement', | |
| IllegalBreak: 'Illegal break statement', | |
| IllegalReturn: 'Illegal return statement', | |
| StrictModeWith: 'Strict mode code may not include a with statement', | |
| StrictCatchVariable: 'Catch variable may not be eval or arguments in strict mode', | |
| StrictVarName: 'Variable name may not be eval or arguments in strict mode', | |
| StrictParamName: 'Parameter name eval or arguments is not allowed in strict mode', | |
| StrictParamDupe: 'Strict mode function may not have duplicate parameter names', | |
| StrictFunctionName: 'Function name may not be eval or arguments in strict mode', | |
| StrictOctalLiteral: 'Octal literals are not allowed in strict mode.', | |
| StrictDelete: 'Delete of an unqualified identifier in strict mode.', | |
| StrictDuplicateProperty: 'Duplicate data property in object literal not allowed in strict mode', | |
| AccessorDataProperty: 'Object literal may not have data and accessor property with the same name', | |
| AccessorGetSet: 'Object literal may not have multiple get/set accessors with the same name', | |
| StrictLHSAssignment: 'Assignment to eval or arguments is not allowed in strict mode', | |
| StrictLHSPostfix: 'Postfix increment/decrement may not have eval or arguments operand in strict mode', | |
| StrictLHSPrefix: 'Prefix increment/decrement may not have eval or arguments operand in strict mode', | |
| StrictReservedWord: 'Use of future reserved word in strict mode' | |
| }; | |
| // See also tools/generate-unicode-regex.py. | |
| Regex = { | |
| NonAsciiIdentifierStart: new RegExp('[\xaa\xb5\xba\xc0-\xd6\xd8-\xf6\xf8-\u02c1\u02c6-\u02d1\u02e0-\u02e4\u02ec\u02ee\u0370-\u0374\u0376\u0377\u037a-\u037d\u0386\u0388-\u038a\u038c\u038e-\u03a1\u03a3-\u03f5\u03f7-\u0481\u048a-\u0527\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\u08a2-\u08ac\u0904-\u0939\u093d\u0950\u0958-\u0961\u0971-\u0977\u0979-\u097f\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\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-\u0c33\u0c35-\u0c39\u0c3d\u0c58\u0c59\u0c60\u0c61\u0c85-\u0c8c\u0c8e-\u0c90\u0c92-\u0ca8\u0caa-\u0cb3\u0cb5-\u0cb9\u0cbd\u0cde\u0ce0\u0ce1\u0cf1\u0cf2\u0d05-\u0d0c\u0d0e-\u0d10\u0d12-\u0d3a\u0d3d\u0d4e\u0d60\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-\u13f4\u1401-\u166c\u166f-\u167f\u1681-\u169a\u16a0-\u16ea\u16ee-\u16f0\u1700-\u170c\u170e-\u1711\u1720-\u1731\u1740-\u1751\u1760-\u176c\u176e-\u1770\u1780-\u17b3\u17d7\u17dc\u1820-\u1877\u1880-\u18a8\u18aa\u18b0-\u18f5\u1900-\u191c\u1950-\u196d\u1970-\u1974\u1980-\u19ab\u19c1-\u19c7\u1a00-\u1a16\u1a20-\u1a54\u1aa7\u1b05-\u1b33\u1b45-\u1b4b\u1b83-\u1ba0\u1bae\u1baf\u1bba-\u1be5\u1c00-\u1c23\u1c4d-\u1c4f\u1c5a-\u1c7d\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\u2119-\u211d\u2124\u2126\u2128\u212a-\u212d\u212f-\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\u2e2f\u3005-\u3007\u3021-\u3029\u3031-\u3035\u3038-\u303c\u3041-\u3096\u309d-\u309f\u30a1-\u30fa\u30fc-\u30ff\u3105-\u312d\u3131-\u318e\u31a0-\u31ba\u31f0-\u31ff\u3400-\u4db5\u4e00-\u9fcc\ua000-\ua48c\ua4d0-\ua4fd\ua500-\ua60c\ua610-\ua61f\ua62a\ua62b\ua640-\ua66e\ua67f-\ua697\ua6a0-\ua6ef\ua717-\ua71f\ua722-\ua788\ua78b-\ua78e\ua790-\ua793\ua7a0-\ua7aa\ua7f8-\ua801\ua803-\ua805\ua807-\ua80a\ua80c-\ua822\ua840-\ua873\ua882-\ua8b3\ua8f2-\ua8f7\ua8fb\ua90a-\ua925\ua930-\ua946\ua960-\ua97c\ua984-\ua9b2\ua9cf\uaa00-\uaa28\uaa40-\uaa42\uaa44-\uaa4b\uaa60-\uaa76\uaa7a\uaa80-\uaaaf\uaab1\uaab5\uaab6\uaab9-\uaabd\uaac0\uaac2\uaadb-\uaadd\uaae0-\uaaea\uaaf2-\uaaf4\uab01-\uab06\uab09-\uab0e\uab11-\uab16\uab20-\uab26\uab28-\uab2e\uabc0-\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]'), | |
| NonAsciiIdentifierPart: new 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\uffc7\uffca-\uffcf\uffd2-\uffd7\uffda-\uffdc]') | |
| }; | |
| // Ensure the condition is true, otherwise throw an error. | |
| // This is only to have a better contract semantic, i.e. another safety net | |
| // to catch a logic error. The condition shall be fulfilled in normal case. | |
| // Do NOT use this to enforce a certain condition on any user input. | |
| function assert(condition, message) { | |
| if (!condition) { | |
| throw new Error('ASSERT: ' + message); | |
| } | |
| } | |
| function sliceSource(from, to) { | |
| return source.slice(from, to); | |
| } | |
| if (typeof 'esprima'[0] === 'undefined') { | |
| sliceSource = function sliceArraySource(from, to) { | |
| return source.slice(from, to).join(''); | |
| }; | |
| } | |
| function isDecimalDigit(ch) { | |
| return '0123456789'.indexOf(ch) >= 0; | |
| } | |
| function isHexDigit(ch) { | |
| return '0123456789abcdefABCDEF'.indexOf(ch) >= 0; | |
| } | |
| function isOctalDigit(ch) { | |
| return '01234567'.indexOf(ch) >= 0; | |
| } | |
| // 7.2 White Space | |
| function isWhiteSpace(ch) { | |
| return (ch === ' ') || (ch === '\u0009') || (ch === '\u000B') || | |
| (ch === '\u000C') || (ch === '\u00A0') || | |
| (ch.charCodeAt(0) >= 0x1680 && | |
| '\u1680\u180E\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200A\u202F\u205F\u3000\uFEFF'.indexOf(ch) >= 0); | |
| } | |
| // 7.3 Line Terminators | |
| function isLineTerminator(ch) { | |
| return (ch === '\n' || ch === '\r' || ch === '\u2028' || ch === '\u2029'); | |
| } | |
| // 7.6 Identifier Names and Identifiers | |
| function isIdentifierStart(ch) { | |
| return (ch === '$') || (ch === '_') || (ch === '\\') || | |
| (ch >= 'a' && ch <= 'z') || (ch >= 'A' && ch <= 'Z') || | |
| ((ch.charCodeAt(0) >= 0x80) && Regex.NonAsciiIdentifierStart.test(ch)); | |
| } | |
| function isIdentifierPart(ch) { | |
| return (ch === '$') || (ch === '_') || (ch === '\\') || | |
| (ch >= 'a' && ch <= 'z') || (ch >= 'A' && ch <= 'Z') || | |
| ((ch >= '0') && (ch <= '9')) || | |
| ((ch.charCodeAt(0) >= 0x80) && Regex.NonAsciiIdentifierPart.test(ch)); | |
| } | |
| // 7.6.1.2 Future Reserved Words | |
| function isFutureReservedWord(id) { | |
| switch (id) { | |
| // Future reserved words. | |
| case 'class': | |
| case 'enum': | |
| case 'export': | |
| case 'extends': | |
| case 'import': | |
| case 'super': | |
| return true; | |
| } | |
| return false; | |
| } | |
| function isStrictModeReservedWord(id) { | |
| switch (id) { | |
| // Strict Mode reserved words. | |
| case 'implements': | |
| case 'interface': | |
| case 'package': | |
| case 'private': | |
| case 'protected': | |
| case 'public': | |
| case 'static': | |
| case 'yield': | |
| case 'let': | |
| return true; | |
| } | |
| return false; | |
| } | |
| function isRestrictedWord(id) { | |
| return id === 'eval' || id === 'arguments'; | |
| } | |
| // 7.6.1.1 Keywords | |
| function isKeyword(id) { | |
| var keyword = false; | |
| switch (id.length) { | |
| case 2: | |
| keyword = (id === 'if') || (id === 'in') || (id === 'do'); | |
| break; | |
| case 3: | |
| keyword = (id === 'var') || (id === 'for') || (id === 'new') || (id === 'try'); | |
| break; | |
| case 4: | |
| keyword = (id === 'this') || (id === 'else') || (id === 'case') || (id === 'void') || (id === 'with'); | |
| break; | |
| case 5: | |
| keyword = (id === 'while') || (id === 'break') || (id === 'catch') || (id === 'throw'); | |
| break; | |
| case 6: | |
| keyword = (id === 'return') || (id === 'typeof') || (id === 'delete') || (id === 'switch'); | |
| break; | |
| case 7: | |
| keyword = (id === 'default') || (id === 'finally'); | |
| break; | |
| case 8: | |
| keyword = (id === 'function') || (id === 'continue') || (id === 'debugger'); | |
| break; | |
| case 10: | |
| keyword = (id === 'instanceof'); | |
| break; | |
| } | |
| if (keyword) { | |
| return true; | |
| } | |
| switch (id) { | |
| // Future reserved words. | |
| // 'const' is specialized as Keyword in V8. | |
| case 'const': | |
| return true; | |
| // For compatiblity to SpiderMonkey and ES.next | |
| case 'yield': | |
| case 'let': | |
| return true; | |
| } | |
| if (strict && isStrictModeReservedWord(id)) { | |
| return true; | |
| } | |
| return isFutureReservedWord(id); | |
| } | |
| // Return the next character and move forward. | |
| function nextChar() { | |
| return source[index++]; | |
| } | |
| // 7.4 Comments | |
| function skipComment() { | |
| var ch, blockComment, lineComment; | |
| blockComment = false; | |
| lineComment = false; | |
| while (index < length) { | |
| ch = source[index]; | |
| if (lineComment) { | |
| ch = nextChar(); | |
| if (isLineTerminator(ch)) { | |
| lineComment = false; | |
| if (ch === '\r' && source[index] === '\n') { | |
| ++index; | |
| } | |
| if (indents.length < lineNumber + 1) | |
| indents[lineNumber] = index - lineStart; | |
| ++lineNumber; | |
| lineStart = index; | |
| } | |
| } else if (blockComment) { | |
| if (isLineTerminator(ch)) { | |
| if (ch === '\r' && source[index + 1] === '\n') { | |
| ++index; | |
| } | |
| if (indents.length < lineNumber + 1) | |
| indents[lineNumber] = index - lineStart; | |
| ++lineNumber; | |
| ++index; | |
| lineStart = index; | |
| if (index >= length) { | |
| throwError({}, Messages.UnexpectedToken, 'ILLEGAL'); | |
| } | |
| } else { | |
| ch = nextChar(); | |
| if (index >= length) { | |
| throwError({}, Messages.UnexpectedToken, 'ILLEGAL'); | |
| } | |
| if (ch === '*') { | |
| ch = source[index]; | |
| if (ch === '/') { | |
| ++index; | |
| blockComment = false; | |
| } | |
| } | |
| } | |
| } else if (ch === '/') { | |
| ch = source[index + 1]; | |
| if (ch === '/') { | |
| index += 2; | |
| lineComment = true; | |
| } else if (ch === '*') { | |
| index += 2; | |
| blockComment = true; | |
| if (index >= length) { | |
| throwError({}, Messages.UnexpectedToken, 'ILLEGAL'); | |
| } | |
| } else { | |
| break; | |
| } | |
| } else if (isWhiteSpace(ch)) { | |
| ++index; | |
| } else if (isLineTerminator(ch)) { | |
| ++index; | |
| if (ch === '\r' && source[index] === '\n') { | |
| ++index; | |
| } | |
| if (indents.length < lineNumber + 1) | |
| indents[lineNumber] = index - lineStart; | |
| ++lineNumber; | |
| lineStart = index; | |
| } else { | |
| break; | |
| } | |
| } | |
| if (indents.length < lineNumber + 1) | |
| indents[lineNumber] = index - lineStart; | |
| } | |
| function scanHexEscape(prefix) { | |
| var i, len, ch, code = 0; | |
| len = (prefix === 'u') ? 4 : 2; | |
| for (i = 0; i < len; ++i) { | |
| if (index < length && isHexDigit(source[index])) { | |
| ch = nextChar(); | |
| code = code * 16 + '0123456789abcdef'.indexOf(ch.toLowerCase()); | |
| } else { | |
| return ''; | |
| } | |
| } | |
| return String.fromCharCode(code); | |
| } | |
| function scanIdentifier() { | |
| var ch, start, id, restore; | |
| ch = source[index]; | |
| if (!isIdentifierStart(ch)) { | |
| return; | |
| } | |
| start = index; | |
| if (ch === '\\') { | |
| ++index; | |
| if (source[index] !== 'u') { | |
| return; | |
| } | |
| ++index; | |
| restore = index; | |
| ch = scanHexEscape('u'); | |
| if (ch) { | |
| if (ch === '\\' || !isIdentifierStart(ch)) { | |
| return; | |
| } | |
| id = ch; | |
| } else { | |
| index = restore; | |
| id = 'u'; | |
| } | |
| } else { | |
| id = nextChar(); | |
| } | |
| while (index < length) { | |
| ch = source[index]; | |
| if (!isIdentifierPart(ch)) { | |
| break; | |
| } | |
| if (ch === '\\') { | |
| ++index; | |
| if (source[index] !== 'u') { | |
| return; | |
| } | |
| ++index; | |
| restore = index; | |
| ch = scanHexEscape('u'); | |
| if (ch) { | |
| if (ch === '\\' || !isIdentifierPart(ch)) { | |
| return; | |
| } | |
| id += ch; | |
| } else { | |
| index = restore; | |
| id += 'u'; | |
| } | |
| } else { | |
| id += nextChar(); | |
| } | |
| } | |
| // There is no keyword or literal with only one character. | |
| // Thus, it must be an identifier. | |
| if (id.length === 1) { | |
| return { | |
| type: Token.Identifier, | |
| value: id, | |
| lineNumber: lineNumber, | |
| lineStart: lineStart, | |
| range: [start, index] | |
| }; | |
| } | |
| if (isKeyword(id)) { | |
| return { | |
| type: Token.Keyword, | |
| value: id, | |
| lineNumber: lineNumber, | |
| lineStart: lineStart, | |
| range: [start, index] | |
| }; | |
| } | |
| // 7.8.1 Null Literals | |
| if (id === 'null') { | |
| return { | |
| type: Token.NullLiteral, | |
| value: id, | |
| lineNumber: lineNumber, | |
| lineStart: lineStart, | |
| range: [start, index] | |
| }; | |
| } | |
| // 7.8.2 Boolean Literals | |
| if (id === 'true' || id === 'false') { | |
| return { | |
| type: Token.BooleanLiteral, | |
| value: id, | |
| lineNumber: lineNumber, | |
| lineStart: lineStart, | |
| range: [start, index] | |
| }; | |
| } | |
| return { | |
| type: Token.Identifier, | |
| value: id, | |
| lineNumber: lineNumber, | |
| lineStart: lineStart, | |
| range: [start, index] | |
| }; | |
| } | |
| // 7.7 Punctuators | |
| function scanPunctuator() { | |
| var start = index, | |
| ch1 = source[index], | |
| ch2, | |
| ch3, | |
| ch4; | |
| // Check for most common single-character punctuators. | |
| if (ch1 === ';' || ch1 === '{' || ch1 === '}') { | |
| ++index; | |
| return { | |
| type: Token.Punctuator, | |
| value: ch1, | |
| lineNumber: lineNumber, | |
| lineStart: lineStart, | |
| range: [start, index] | |
| }; | |
| } | |
| if (ch1 === ',' || ch1 === '(' || ch1 === ')') { | |
| ++index; | |
| return { | |
| type: Token.Punctuator, | |
| value: ch1, | |
| lineNumber: lineNumber, | |
| lineStart: lineStart, | |
| range: [start, index] | |
| }; | |
| } | |
| // Dot (.) can also start a floating-point number, hence the need | |
| // to check the next character. | |
| ch2 = source[index + 1]; | |
| if (ch1 === '.' && !isDecimalDigit(ch2)) { | |
| return { | |
| type: Token.Punctuator, | |
| value: nextChar(), | |
| lineNumber: lineNumber, | |
| lineStart: lineStart, | |
| range: [start, index] | |
| }; | |
| } | |
| // Peek more characters. | |
| ch3 = source[index + 2]; | |
| ch4 = source[index + 3]; | |
| // 4-character punctuator: >>>= | |
| if (ch1 === '>' && ch2 === '>' && ch3 === '>') { | |
| if (ch4 === '=') { | |
| index += 4; | |
| return { | |
| type: Token.Punctuator, | |
| value: '>>>=', | |
| lineNumber: lineNumber, | |
| lineStart: lineStart, | |
| range: [start, index] | |
| }; | |
| } | |
| } | |
| // 3-character punctuators: === !== >>> <<= >>= | |
| if (ch1 === '=' && ch2 === '=' && ch3 === '=') { | |
| index += 3; | |
| return { | |
| type: Token.Punctuator, | |
| value: '===', | |
| lineNumber: lineNumber, | |
| lineStart: lineStart, | |
| range: [start, index] | |
| }; | |
| } | |
| if (ch1 === '!' && ch2 === '=' && ch3 === '=') { | |
| index += 3; | |
| return { | |
| type: Token.Punctuator, | |
| value: '!==', | |
| lineNumber: lineNumber, | |
| lineStart: lineStart, | |
| range: [start, index] | |
| }; | |
| } | |
| if (ch1 === '>' && ch2 === '>' && ch3 === '>') { | |
| index += 3; | |
| return { | |
| type: Token.Punctuator, | |
| value: '>>>', | |
| lineNumber: lineNumber, | |
| lineStart: lineStart, | |
| range: [start, index] | |
| }; | |
| } | |
| if (ch1 === '<' && ch2 === '<' && ch3 === '=') { | |
| index += 3; | |
| return { | |
| type: Token.Punctuator, | |
| value: '<<=', | |
| lineNumber: lineNumber, | |
| lineStart: lineStart, | |
| range: [start, index] | |
| }; | |
| } | |
| if (ch1 === '>' && ch2 === '>' && ch3 === '=') { | |
| index += 3; | |
| return { | |
| type: Token.Punctuator, | |
| value: '>>=', | |
| lineNumber: lineNumber, | |
| lineStart: lineStart, | |
| range: [start, index] | |
| }; | |
| } | |
| // 2-character punctuators: <= >= == != ++ -- << >> && || | |
| // += -= *= %= &= |= ^= /= | |
| if (ch2 === '=') { | |
| if ('<>=!+-*%&|^/'.indexOf(ch1) >= 0) { | |
| index += 2; | |
| return { | |
| type: Token.Punctuator, | |
| value: ch1 + ch2, | |
| lineNumber: lineNumber, | |
| lineStart: lineStart, | |
| range: [start, index] | |
| }; | |
| } | |
| } | |
| if (ch1 === ch2 && ('+-<>&|'.indexOf(ch1) >= 0)) { | |
| if ('+-<>&|'.indexOf(ch2) >= 0) { | |
| index += 2; | |
| return { | |
| type: Token.Punctuator, | |
| value: ch1 + ch2, | |
| lineNumber: lineNumber, | |
| lineStart: lineStart, | |
| range: [start, index] | |
| }; | |
| } | |
| } | |
| // The remaining 1-character punctuators. | |
| if ('[]<>+-*%&|^!~?:=/'.indexOf(ch1) >= 0) { | |
| return { | |
| type: Token.Punctuator, | |
| value: nextChar(), | |
| lineNumber: lineNumber, | |
| lineStart: lineStart, | |
| range: [start, index] | |
| }; | |
| } | |
| } | |
| // 7.8.3 Numeric Literals | |
| function scanNumericLiteral() { | |
| var number, start, ch; | |
| ch = source[index]; | |
| assert(isDecimalDigit(ch) || (ch === '.'), | |
| 'Numeric literal must start with a decimal digit or a decimal point'); | |
| start = index; | |
| number = ''; | |
| if (ch !== '.') { | |
| number = nextChar(); | |
| ch = source[index]; | |
| // Hex number starts with '0x'. | |
| // Octal number starts with '0'. | |
| if (number === '0') { | |
| if (ch === 'x' || ch === 'X') { | |
| number += nextChar(); | |
| while (index < length) { | |
| ch = source[index]; | |
| if (!isHexDigit(ch)) { | |
| break; | |
| } | |
| number += nextChar(); | |
| } | |
| if (number.length <= 2) { | |
| // only 0x | |
| throwError({}, Messages.UnexpectedToken, 'ILLEGAL'); | |
| } | |
| if (index < length) { | |
| ch = source[index]; | |
| if (isIdentifierStart(ch)) { | |
| throwError({}, Messages.UnexpectedToken, 'ILLEGAL'); | |
| } | |
| } | |
| return { | |
| type: Token.NumericLiteral, | |
| value: parseInt(number, 16), | |
| lineNumber: lineNumber, | |
| lineStart: lineStart, | |
| range: [start, index] | |
| }; | |
| } else if (isOctalDigit(ch)) { | |
| number += nextChar(); | |
| while (index < length) { | |
| ch = source[index]; | |
| if (!isOctalDigit(ch)) { | |
| break; | |
| } | |
| number += nextChar(); | |
| } | |
| if (index < length) { | |
| ch = source[index]; | |
| if (isIdentifierStart(ch) || isDecimalDigit(ch)) { | |
| throwError({}, Messages.UnexpectedToken, 'ILLEGAL'); | |
| } | |
| } | |
| return { | |
| type: Token.NumericLiteral, | |
| value: parseInt(number, 8), | |
| octal: true, | |
| lineNumber: lineNumber, | |
| lineStart: lineStart, | |
| range: [start, index] | |
| }; | |
| } | |
| // decimal number starts with '0' such as '09' is illegal. | |
| if (isDecimalDigit(ch)) { | |
| throwError({}, Messages.UnexpectedToken, 'ILLEGAL'); | |
| } | |
| } | |
| while (index < length) { | |
| ch = source[index]; | |
| if (!isDecimalDigit(ch)) { | |
| break; | |
| } | |
| number += nextChar(); | |
| } | |
| } | |
| if (ch === '.') { | |
| number += nextChar(); | |
| while (index < length) { | |
| ch = source[index]; | |
| if (!isDecimalDigit(ch)) { | |
| break; | |
| } | |
| number += nextChar(); | |
| } | |
| } | |
| if (ch === 'e' || ch === 'E') { | |
| number += nextChar(); | |
| ch = source[index]; | |
| if (ch === '+' || ch === '-') { | |
| number += nextChar(); | |
| } | |
| ch = source[index]; | |
| if (isDecimalDigit(ch)) { | |
| number += nextChar(); | |
| while (index < length) { | |
| ch = source[index]; | |
| if (!isDecimalDigit(ch)) { | |
| break; | |
| } | |
| number += nextChar(); | |
| } | |
| } else { | |
| ch = 'character ' + ch; | |
| if (index >= length) { | |
| ch = '<end>'; | |
| } | |
| throwError({}, Messages.UnexpectedToken, 'ILLEGAL'); | |
| } | |
| } | |
| if (index < length) { | |
| ch = source[index]; | |
| if (isIdentifierStart(ch)) { | |
| throwError({}, Messages.UnexpectedToken, 'ILLEGAL'); | |
| } | |
| } | |
| return { | |
| type: Token.NumericLiteral, | |
| value: parseFloat(number), | |
| lineNumber: lineNumber, | |
| lineStart: lineStart, | |
| range: [start, index] | |
| }; | |
| } | |
| // 7.8.4 String Literals | |
| function scanStringLiteral() { | |
| var str = '', quote, start, ch, code, unescaped, restore, octal = false; | |
| quote = source[index]; | |
| assert((quote === '\'' || quote === '"'), | |
| 'String literal must starts with a quote'); | |
| start = index; | |
| ++index; | |
| while (index < length) { | |
| ch = nextChar(); | |
| if (ch === quote) { | |
| quote = ''; | |
| break; | |
| } else if (ch === '\\') { | |
| ch = nextChar(); | |
| if (!isLineTerminator(ch)) { | |
| switch (ch) { | |
| case 'n': | |
| str += '\n'; | |
| break; | |
| case 'r': | |
| str += '\r'; | |
| break; | |
| case 't': | |
| str += '\t'; | |
| break; | |
| case 'u': | |
| case 'x': | |
| restore = index; | |
| unescaped = scanHexEscape(ch); | |
| if (unescaped) { | |
| str += unescaped; | |
| } else { | |
| index = restore; | |
| str += ch; | |
| } | |
| break; | |
| case 'b': | |
| str += '\b'; | |
| break; | |
| case 'f': | |
| str += '\f'; | |
| break; | |
| case 'v': | |
| str += '\v'; | |
| break; | |
| default: | |
| if (isOctalDigit(ch)) { | |
| code = '01234567'.indexOf(ch); | |
| // \0 is not octal escape sequence | |
| if (code !== 0) { | |
| octal = true; | |
| } | |
| if (index < length && isOctalDigit(source[index])) { | |
| octal = true; | |
| code = code * 8 + '01234567'.indexOf(nextChar()); | |
| // 3 digits are only allowed when string starts | |
| // with 0, 1, 2, 3 | |
| if ('0123'.indexOf(ch) >= 0 && | |
| index < length && | |
| isOctalDigit(source[index])) { | |
| code = code * 8 + '01234567'.indexOf(nextChar()); | |
| } | |
| } | |
| str += String.fromCharCode(code); | |
| } else { | |
| str += ch; | |
| } | |
| break; | |
| } | |
| } else { | |
| ++lineNumber; | |
| if (ch === '\r' && source[index] === '\n') { | |
| ++index; | |
| } | |
| } | |
| } else if (isLineTerminator(ch)) { | |
| break; | |
| } else { | |
| str += ch; | |
| } | |
| } | |
| if (quote !== '') { | |
| throwError({}, Messages.UnexpectedToken, 'ILLEGAL'); | |
| } | |
| return { | |
| type: Token.StringLiteral, | |
| value: str, | |
| octal: octal, | |
| lineNumber: lineNumber, | |
| lineStart: lineStart, | |
| range: [start, index] | |
| }; | |
| } | |
| function scanRegExp() { | |
| var str = '', ch, start, pattern, flags, value, classMarker = false, restore; | |
| buffer = null; | |
| skipComment(); | |
| start = index; | |
| ch = source[index]; | |
| assert(ch === '/', 'Regular expression literal must start with a slash'); | |
| str = nextChar(); | |
| while (index < length) { | |
| ch = nextChar(); | |
| str += ch; | |
| if (classMarker) { | |
| if (ch === ']') { | |
| classMarker = false; | |
| } | |
| } else { | |
| if (ch === '\\') { | |
| ch = nextChar(); | |
| // ECMA-262 7.8.5 | |
| if (isLineTerminator(ch)) { | |
| throwError({}, Messages.UnterminatedRegExp); | |
| } | |
| str += ch; | |
| } | |
| else if (ch === '/') { | |
| break; | |
| } | |
| else if (ch === '[') { | |
| classMarker = true; | |
| } | |
| else if (isLineTerminator(ch)) { | |
| throwError({}, Messages.UnterminatedRegExp); | |
| } | |
| } | |
| } | |
| if (str.length === 1) { | |
| throwError({}, Messages.UnterminatedRegExp); | |
| } | |
| // Exclude leading and trailing slash. | |
| pattern = str.substr(1, str.length - 2); | |
| flags = ''; | |
| while (index < length) { | |
| ch = source[index]; | |
| if (!isIdentifierPart(ch)) { | |
| break; | |
| } | |
| ++index; | |
| if (ch === '\\' && index < length) { | |
| ch = source[index]; | |
| if (ch === 'u') { | |
| ++index; | |
| restore = index; | |
| ch = scanHexEscape('u'); | |
| if (ch) { | |
| flags += ch; | |
| str += '\\u'; | |
| for (; restore < index; ++restore) { | |
| str += source[restore]; | |
| } | |
| } else { | |
| index = restore; | |
| flags += 'u'; | |
| str += '\\u'; | |
| } | |
| } else { | |
| str += '\\'; | |
| } | |
| } else { | |
| flags += ch; | |
| str += ch; | |
| } | |
| } | |
| try { | |
| value = new RegExp(pattern, flags); | |
| } catch (e) { | |
| throwError({}, Messages.InvalidRegExp); | |
| } | |
| return { | |
| literal: str, | |
| value: value, | |
| range: [start, index] | |
| }; | |
| } | |
| function isIdentifierName(token) { | |
| return token.type === Token.Identifier || | |
| token.type === Token.Keyword || | |
| token.type === Token.BooleanLiteral || | |
| token.type === Token.NullLiteral; | |
| } | |
| function advance() { | |
| var ch, token; | |
| skipComment(); | |
| if (index >= length) { | |
| return { | |
| type: Token.EOF, | |
| lineNumber: lineNumber, | |
| lineStart: lineStart, | |
| range: [index, index] | |
| }; | |
| } | |
| token = scanPunctuator(); | |
| if (typeof token !== 'undefined') { | |
| return token; | |
| } | |
| ch = source[index]; | |
| if (ch === '\'' || ch === '"') { | |
| return scanStringLiteral(); | |
| } | |
| if (ch === '.' || isDecimalDigit(ch)) { | |
| return scanNumericLiteral(); | |
| } | |
| token = scanIdentifier(); | |
| if (typeof token !== 'undefined') { | |
| return token; | |
| } | |
| throwError({}, Messages.UnexpectedToken, 'ILLEGAL'); | |
| } | |
| function lex() { | |
| var token; | |
| if (buffer) { | |
| index = buffer.range[1]; | |
| lineNumber = buffer.lineNumber; | |
| lineStart = buffer.lineStart; | |
| token = buffer; | |
| buffer = null; | |
| return token; | |
| } | |
| buffer = null; | |
| return advance(); | |
| } | |
| function lookahead() { | |
| var pos, line, start; | |
| if (buffer !== null) { | |
| return buffer; | |
| } | |
| pos = index; | |
| line = lineNumber; | |
| start = lineStart; | |
| buffer = advance(); | |
| index = pos; | |
| lineNumber = line; | |
| lineStart = start; | |
| return buffer; | |
| } | |
| // Return true if there is a line terminator before the next token. | |
| function peekLineTerminator(asiflag) { | |
| var pos, line, start, found, indent1, indent2; | |
| pos = index; | |
| line = lineNumber; | |
| start = lineStart; | |
| skipComment(); | |
| found = lineNumber !== line; | |
| if (found) { | |
| indent1 = indents[line]; | |
| indent2 = indents[lineNumber]; | |
| if (asiflag) { | |
| asi[line] = true; | |
| if (indent2>indent1) { | |
| console.log('ASI at line '+line+'('+indent1+'), before indented line ' | |
| +lineNumber+'('+indent2+')'); | |
| } else if (extra.asi) { | |
| console.log('ASI at line '+line); | |
| } | |
| } else { | |
| if (indent2<=indent1) { | |
| console.log('no ASI at line '+line+'('+indent1+'), before non-indented line ' | |
| +lineNumber+'('+indent2+')'); | |
| } | |
| } | |
| } | |
| index = pos; | |
| lineNumber = line; | |
| lineStart = start; | |
| return found; | |
| } | |
| // Throw an exception | |
| function throwError(token, messageFormat) { | |
| var error, | |
| args = Array.prototype.slice.call(arguments, 2), | |
| msg = messageFormat.replace( | |
| /%(\d)/g, | |
| function (whole, index) { | |
| return args[index] || ''; | |
| } | |
| ); | |
| if (typeof token.lineNumber === 'number') { | |
| error = new Error('Line ' + token.lineNumber + ': ' + msg); | |
| error.index = token.range[0]; | |
| error.lineNumber = token.lineNumber; | |
| error.column = token.range[0] - lineStart + 1; | |
| } else { | |
| error = new Error('Line ' + lineNumber + ': ' + msg); | |
| error.index = index; | |
| error.lineNumber = lineNumber; | |
| error.column = index - lineStart + 1; | |
| } | |
| throw error; | |
| } | |
| function throwErrorTolerant() { | |
| var error; | |
| try { | |
| throwError.apply(null, arguments); | |
| } catch (e) { | |
| if (extra.errors) { | |
| extra.errors.push(e); | |
| } else { | |
| throw e; | |
| } | |
| } | |
| } | |
| // Throw an exception because of the token. | |
| function throwUnexpected(token) { | |
| var s; | |
| if (token.type === Token.EOF) { | |
| throwError(token, Messages.UnexpectedEOS); | |
| } | |
| if (token.type === Token.NumericLiteral) { | |
| throwError(token, Messages.UnexpectedNumber); | |
| } | |
| if (token.type === Token.StringLiteral) { | |
| throwError(token, Messages.UnexpectedString); | |
| } | |
| if (token.type === Token.Identifier) { | |
| throwError(token, Messages.UnexpectedIdentifier); | |
| } | |
| if (token.type === Token.Keyword) { | |
| if (isFutureReservedWord(token.value)) { | |
| throwError(token, Messages.UnexpectedReserved); | |
| } else if (strict && isStrictModeReservedWord(token.value)) { | |
| throwError(token, Messages.StrictReservedWord); | |
| } | |
| throwError(token, Messages.UnexpectedToken, token.value); | |
| } | |
| // BooleanLiteral, NullLiteral, or Punctuator. | |
| throwError(token, Messages.UnexpectedToken, token.value); | |
| } | |
| // Expect the next token to match the specified punctuator. | |
| // If not, an exception will be thrown. | |
| function expect(value) { | |
| var token = lex(); | |
| if (token.type !== Token.Punctuator || token.value !== value) { | |
| throwUnexpected(token); | |
| } | |
| } | |
| // Expect the next token to match the specified keyword. | |
| // If not, an exception will be thrown. | |
| function expectKeyword(keyword) { | |
| var token = lex(); | |
| if (token.type !== Token.Keyword || token.value !== keyword) { | |
| throwUnexpected(token); | |
| } | |
| } | |
| // Return true if the next token matches the specified punctuator. | |
| function match(value) { | |
| var token = lookahead(); | |
| return token.type === Token.Punctuator && token.value === value; | |
| } | |
| // Return true if the next token matches the specified keyword | |
| function matchKeyword(keyword) { | |
| var token = lookahead(); | |
| return token.type === Token.Keyword && token.value === keyword; | |
| } | |
| // Return true if the next token is an assignment operator | |
| function matchAssign() { | |
| var token = lookahead(), | |
| op = token.value; | |
| if (token.type !== Token.Punctuator) { | |
| return false; | |
| } | |
| return op === '=' || | |
| op === '*=' || | |
| op === '/=' || | |
| op === '%=' || | |
| op === '+=' || | |
| op === '-=' || | |
| op === '<<=' || | |
| op === '>>=' || | |
| op === '>>>=' || | |
| op === '&=' || | |
| op === '^=' || | |
| op === '|='; | |
| } | |
| function consumeSemicolon() { | |
| var token, line, start, indent1, indent2; | |
| // Catch the very common case first. | |
| if (source[index] === ';') { | |
| lex(); | |
| return; | |
| } | |
| line = lineNumber; start = lineStart; | |
| skipComment(); | |
| if (lineNumber !== line) { | |
| indent1 = indents[line]; | |
| indent2 = indents[lineNumber]; | |
| asi[line] = true; | |
| if (indent2>indent1) { | |
| console.log('ASI at line '+line+'('+indent1+') before indented line ' | |
| +lineNumber+'('+indent2+')') | |
| } else if (extra.asi) { | |
| console.log('ASI at line '+line); | |
| } | |
| return; | |
| } | |
| if (match(';')) { | |
| lex(); | |
| return; | |
| } | |
| token = lookahead(); | |
| if (token.type !== Token.EOF && !match('}')) { | |
| throwUnexpected(token); | |
| } | |
| asi[lineNumber] = true; | |
| if (extra.asi) console.log('ASI at line '+line); | |
| return; | |
| } | |
| // Return true if provided expression is LeftHandSideExpression | |
| function isLeftHandSide(expr) { | |
| switch (expr.type) { | |
| case 'AssignmentExpression': | |
| case 'BinaryExpression': | |
| case 'ConditionalExpression': | |
| case 'LogicalExpression': | |
| case 'SequenceExpression': | |
| case 'UnaryExpression': | |
| case 'UpdateExpression': | |
| return false; | |
| } | |
| return true; | |
| } | |
| // 11.1.4 Array Initialiser | |
| function parseArrayInitialiser() { | |
| var elements = [], | |
| undef; | |
| expect('['); | |
| while (!match(']')) { | |
| if (match(',')) { | |
| lex(); | |
| elements.push(undef); | |
| } else { | |
| elements.push(parseAssignmentExpression()); | |
| if (!match(']')) { | |
| expect(','); | |
| } | |
| } | |
| } | |
| expect(']'); | |
| return { | |
| type: Syntax.ArrayExpression, | |
| elements: elements | |
| }; | |
| } | |
| // 11.1.5 Object Initialiser | |
| function parsePropertyFunction(param, first) { | |
| var previousStrict, body; | |
| previousStrict = strict; | |
| body = parseFunctionSourceElements(); | |
| if (first && strict && isRestrictedWord(param[0].name)) { | |
| throwError(first, Messages.StrictParamName); | |
| } | |
| strict = previousStrict; | |
| return { | |
| type: Syntax.FunctionExpression, | |
| id: null, | |
| params: param, | |
| body: body | |
| }; | |
| } | |
| function parseObjectPropertyKey() { | |
| var token = lex(); | |
| // Note: This function is called only from parseObjectProperty(), where | |
| // EOF and Punctuator tokens are already filtered out. | |
| if (token.type === Token.StringLiteral || token.type === Token.NumericLiteral) { | |
| if (strict && token.octal) { | |
| throwError(token, Messages.StrictOctalLiteral); | |
| } | |
| return createLiteral(token); | |
| } | |
| return { | |
| type: Syntax.Identifier, | |
| name: token.value | |
| }; | |
| } | |
| function parseObjectProperty() { | |
| var token, key, id, param; | |
| token = lookahead(); | |
| if (token.type === Token.Identifier) { | |
| id = parseObjectPropertyKey(); | |
| // Property Assignment: Getter and Setter. | |
| if (token.value === 'get' && !match(':')) { | |
| key = parseObjectPropertyKey(); | |
| expect('('); | |
| expect(')'); | |
| return { | |
| type: Syntax.Property, | |
| key: key, | |
| value: parsePropertyFunction([]), | |
| kind: 'get' | |
| }; | |
| } else if (token.value === 'set' && !match(':')) { | |
| key = parseObjectPropertyKey(); | |
| expect('('); | |
| token = lookahead(); | |
| if (token.type !== Token.Identifier) { | |
| throwUnexpected(lex()); | |
| } | |
| param = [ parseVariableIdentifier() ]; | |
| expect(')'); | |
| return { | |
| type: Syntax.Property, | |
| key: key, | |
| value: parsePropertyFunction(param, token), | |
| kind: 'set' | |
| }; | |
| } else { | |
| expect(':'); | |
| return { | |
| type: Syntax.Property, | |
| key: id, | |
| value: parseAssignmentExpression(), | |
| kind: 'init' | |
| }; | |
| } | |
| } else if (token.type === Token.EOF || token.type === Token.Punctuator) { | |
| throwUnexpected(token); | |
| } else { | |
| key = parseObjectPropertyKey(); | |
| expect(':'); | |
| return { | |
| type: Syntax.Property, | |
| key: key, | |
| value: parseAssignmentExpression(), | |
| kind: 'init' | |
| }; | |
| } | |
| } | |
| function parseObjectInitialiser() { | |
| var token, properties = [], property, name, kind, map = {}, toString = String; | |
| expect('{'); | |
| while (!match('}')) { | |
| property = parseObjectProperty(); | |
| if (property.key.type === Syntax.Identifier) { | |
| name = property.key.name; | |
| } else { | |
| name = toString(property.key.value); | |
| } | |
| kind = (property.kind === 'init') ? PropertyKind.Data : (property.kind === 'get') ? PropertyKind.Get : PropertyKind.Set; | |
| if (Object.prototype.hasOwnProperty.call(map, name)) { | |
| if (map[name] === PropertyKind.Data) { | |
| if (strict && kind === PropertyKind.Data) { | |
| throwErrorTolerant({}, Messages.StrictDuplicateProperty); | |
| } else if (kind !== PropertyKind.Data) { | |
| throwError({}, Messages.AccessorDataProperty); | |
| } | |
| } else { | |
| if (kind === PropertyKind.Data) { | |
| throwError({}, Messages.AccessorDataProperty); | |
| } else if (map[name] & kind) { | |
| throwError({}, Messages.AccessorGetSet); | |
| } | |
| } | |
| map[name] |= kind; | |
| } else { | |
| map[name] = kind; | |
| } | |
| properties.push(property); | |
| if (!match('}')) { | |
| expect(','); | |
| } | |
| } | |
| expect('}'); | |
| return { | |
| type: Syntax.ObjectExpression, | |
| fully_wrapped: true, | |
| properties: properties | |
| }; | |
| } | |
| // 11.1 Primary Expressions | |
| function parsePrimaryExpression() { | |
| var expr, | |
| token = lookahead(), | |
| type = token.type; | |
| if (type === Token.Identifier) { | |
| return { | |
| type: Syntax.Identifier, | |
| name: lex().value | |
| }; | |
| } | |
| if (type === Token.StringLiteral || type === Token.NumericLiteral) { | |
| if (strict && token.octal) { | |
| throwErrorTolerant(token, Messages.StrictOctalLiteral); | |
| } | |
| return createLiteral(lex()); | |
| } | |
| if (type === Token.Keyword) { | |
| if (matchKeyword('this')) { | |
| lex(); | |
| return { | |
| type: Syntax.ThisExpression | |
| }; | |
| } | |
| if (matchKeyword('function')) { | |
| return parseFunctionExpression(); | |
| } | |
| } | |
| if (type === Token.BooleanLiteral) { | |
| lex(); | |
| token.value = (token.value === 'true'); | |
| return createLiteral(token); | |
| } | |
| if (type === Token.NullLiteral) { | |
| lex(); | |
| token.value = null; | |
| return createLiteral(token); | |
| } | |
| if (match('[')) { | |
| return parseArrayInitialiser(); | |
| } | |
| if (match('{')) { | |
| return parseObjectInitialiser(); | |
| } | |
| if (match('(')) { | |
| lex(); | |
| state.lastParenthesized = expr = parseExpression(); | |
| expect(')'); | |
| return expr; | |
| } | |
| if (match('/') || match('/=')) { | |
| return createLiteral(scanRegExp()); | |
| } | |
| return throwUnexpected(lex()); | |
| } | |
| // 11.2 Left-Hand-Side Expressions | |
| function parseArguments() { | |
| var args = []; | |
| expect('('); | |
| if (!match(')')) { | |
| while (index < length) { | |
| args.push(parseAssignmentExpression()); | |
| if (match(')')) { | |
| break; | |
| } | |
| expect(','); | |
| } | |
| } | |
| expect(')'); | |
| return args; | |
| } | |
| function parseNonComputedProperty() { | |
| var token = lex(); | |
| if (!isIdentifierName(token)) { | |
| throwUnexpected(token); | |
| } | |
| return { | |
| type: Syntax.Identifier, | |
| name: token.value | |
| }; | |
| } | |
| function parseNonComputedMember(object) { | |
| return { | |
| type: Syntax.MemberExpression, | |
| computed: false, | |
| object: object, | |
| property: parseNonComputedProperty() | |
| }; | |
| } | |
| function parseComputedMember(object) { | |
| var property, expr; | |
| expect('['); | |
| property = parseExpression(); | |
| expr = { | |
| type: Syntax.MemberExpression, | |
| computed: true, | |
| object: object, | |
| property: property | |
| }; | |
| expect(']'); | |
| return expr; | |
| } | |
| function parseCallMember(object) { | |
| peekLineTerminator(false); | |
| return { | |
| type: Syntax.CallExpression, | |
| callee: object, | |
| 'arguments': parseArguments() | |
| }; | |
| } | |
| function parseNewExpression() { | |
| var expr; | |
| expectKeyword('new'); | |
| expr = { | |
| type: Syntax.NewExpression, | |
| callee: parseLeftHandSideExpression(), | |
| 'arguments': [] | |
| }; | |
| if (match('(')) { | |
| expr['arguments'] = parseArguments(); | |
| } | |
| return expr; | |
| } | |
| function parseLeftHandSideExpressionAllowCall() { | |
| var useNew, expr; | |
| useNew = matchKeyword('new'); | |
| expr = useNew ? parseNewExpression() : parsePrimaryExpression(); | |
| while (index < length) { | |
| if (match('.')) { | |
| lex(); | |
| expr = parseNonComputedMember(expr); | |
| } else if (match('[')) { | |
| peekLineTerminator(false); | |
| expr = parseComputedMember(expr); | |
| } else if (match('(')) { | |
| peekLineTerminator(false); | |
| expr = parseCallMember(expr); | |
| } else { | |
| break; | |
| } | |
| } | |
| return expr; | |
| } | |
| function parseLeftHandSideExpression() { | |
| var useNew, expr; | |
| useNew = matchKeyword('new'); | |
| expr = useNew ? parseNewExpression() : parsePrimaryExpression(); | |
| while (index < length) { | |
| if (match('.')) { | |
| lex(); | |
| expr = parseNonComputedMember(expr); | |
| } else if (match('[')) { | |
| peekLineTerminator(false); | |
| expr = parseComputedMember(expr); | |
| } else { | |
| break; | |
| } | |
| } | |
| return expr; | |
| } | |
| // 11.3 Postfix Expressions | |
| function parsePostfixExpression() { | |
| var expr = parseLeftHandSideExpressionAllowCall(); | |
| if ((match('++') || match('--')) && !peekLineTerminator(true)) { | |
| // 11.3.1, 11.3.2 | |
| if (strict && expr.type === Syntax.Identifier && isRestrictedWord(expr.name)) { | |
| throwError({}, Messages.StrictLHSPostfix); | |
| } | |
| expr = { | |
| type: Syntax.UpdateExpression, | |
| operator: lex().value, | |
| argument: expr, | |
| prefix: false | |
| }; | |
| } | |
| return expr; | |
| } | |
| // 11.4 Unary Operators | |
| function parseUnaryExpression() { | |
| var token, expr; | |
| if (match('++') || match('--')) { | |
| token = lex(); | |
| expr = parseUnaryExpression(); | |
| // 11.4.4, 11.4.5 | |
| if (strict && expr.type === Syntax.Identifier && isRestrictedWord(expr.name)) { | |
| throwError({}, Messages.StrictLHSPrefix); | |
| } | |
| expr = { | |
| type: Syntax.UpdateExpression, | |
| operator: token.value, | |
| argument: expr, | |
| prefix: true | |
| }; | |
| return expr; | |
| } | |
| if (match('+') || match('-') || match('~') || match('!')) { | |
| expr = { | |
| type: Syntax.UnaryExpression, | |
| operator: lex().value, | |
| argument: parseUnaryExpression() | |
| }; | |
| return expr; | |
| } | |
| if (matchKeyword('delete') || matchKeyword('void') || matchKeyword('typeof')) { | |
| expr = { | |
| type: Syntax.UnaryExpression, | |
| operator: lex().value, | |
| argument: parseUnaryExpression() | |
| }; | |
| if (strict && expr.operator === 'delete' && expr.argument.type === Syntax.Identifier) { | |
| throwErrorTolerant({}, Messages.StrictDelete); | |
| } | |
| return expr; | |
| } | |
| return parsePostfixExpression(); | |
| } | |
| // 11.5 Multiplicative Operators | |
| function parseMultiplicativeExpression() { | |
| var expr = parseUnaryExpression(); | |
| while (match('*') || match('/') || match('%')) { | |
| expr = { | |
| type: Syntax.BinaryExpression, | |
| operator: lex().value, | |
| left: expr, | |
| right: parseUnaryExpression() | |
| }; | |
| } | |
| return expr; | |
| } | |
| // 11.6 Additive Operators | |
| function parseAdditiveExpression() { | |
| var expr = parseMultiplicativeExpression(); | |
| while (match('+') || match('-')) { | |
| expr = { | |
| type: Syntax.BinaryExpression, | |
| operator: lex().value, | |
| left: expr, | |
| right: parseMultiplicativeExpression() | |
| }; | |
| } | |
| return expr; | |
| } | |
| // 11.7 Bitwise Shift Operators | |
| function parseShiftExpression() { | |
| var expr = parseAdditiveExpression(); | |
| while (match('<<') || match('>>') || match('>>>')) { | |
| expr = { | |
| type: Syntax.BinaryExpression, | |
| operator: lex().value, | |
| left: expr, | |
| right: parseAdditiveExpression() | |
| }; | |
| } | |
| return expr; | |
| } | |
| // 11.8 Relational Operators | |
| function parseRelationalExpression() { | |
| var expr, previousAllowIn; | |
| previousAllowIn = state.allowIn; | |
| state.allowIn = true; | |
| expr = parseShiftExpression(); | |
| state.allowIn = previousAllowIn; | |
| if (match('<') || match('>') || match('<=') || match('>=')) { | |
| expr = { | |
| type: Syntax.BinaryExpression, | |
| operator: lex().value, | |
| left: expr, | |
| right: parseRelationalExpression() | |
| }; | |
| } else if (state.allowIn && matchKeyword('in')) { | |
| lex(); | |
| expr = { | |
| type: Syntax.BinaryExpression, | |
| operator: 'in', | |
| left: expr, | |
| right: parseRelationalExpression() | |
| }; | |
| } else if (matchKeyword('instanceof')) { | |
| lex(); | |
| expr = { | |
| type: Syntax.BinaryExpression, | |
| operator: 'instanceof', | |
| left: expr, | |
| right: parseRelationalExpression() | |
| }; | |
| } | |
| return expr; | |
| } | |
| // 11.9 Equality Operators | |
| function parseEqualityExpression() { | |
| var expr = parseRelationalExpression(); | |
| while (match('==') || match('!=') || match('===') || match('!==')) { | |
| expr = { | |
| type: Syntax.BinaryExpression, | |
| operator: lex().value, | |
| left: expr, | |
| right: parseRelationalExpression() | |
| }; | |
| } | |
| return expr; | |
| } | |
| // 11.10 Binary Bitwise Operators | |
| function parseBitwiseANDExpression() { | |
| var expr = parseEqualityExpression(); | |
| while (match('&')) { | |
| lex(); | |
| expr = { | |
| type: Syntax.BinaryExpression, | |
| operator: '&', | |
| left: expr, | |
| right: parseEqualityExpression() | |
| }; | |
| } | |
| return expr; | |
| } | |
| function parseBitwiseORExpression() { | |
| var expr = parseBitwiseANDExpression(); | |
| while (match('|')) { | |
| lex(); | |
| expr = { | |
| type: Syntax.BinaryExpression, | |
| operator: '|', | |
| left: expr, | |
| right: parseBitwiseANDExpression() | |
| }; | |
| } | |
| return expr; | |
| } | |
| function parseBitwiseXORExpression() { | |
| var expr = parseBitwiseORExpression(); | |
| while (match('^')) { | |
| lex(); | |
| expr = { | |
| type: Syntax.BinaryExpression, | |
| operator: '^', | |
| left: expr, | |
| right: parseBitwiseORExpression() | |
| }; | |
| } | |
| return expr; | |
| } | |
| // 11.11 Binary Logical Operators | |
| function parseLogicalANDExpression() { | |
| var expr = parseBitwiseXORExpression(); | |
| while (match('&&')) { | |
| lex(); | |
| expr = { | |
| type: Syntax.LogicalExpression, | |
| operator: '&&', | |
| left: expr, | |
| right: parseBitwiseXORExpression() | |
| }; | |
| } | |
| return expr; | |
| } | |
| function parseLogicalORExpression() { | |
| var expr = parseLogicalANDExpression(); | |
| while (match('||')) { | |
| lex(); | |
| expr = { | |
| type: Syntax.LogicalExpression, | |
| operator: '||', | |
| left: expr, | |
| right: parseLogicalANDExpression() | |
| }; | |
| } | |
| return expr; | |
| } | |
| // 11.12 Conditional Operator | |
| function parseConditionalExpression() { | |
| var expr, previousAllowIn, consequent; | |
| expr = parseLogicalORExpression(); | |
| if (match('?')) { | |
| lex(); | |
| previousAllowIn = state.allowIn; | |
| state.allowIn = true; | |
| consequent = parseAssignmentExpression(); | |
| state.allowIn = previousAllowIn; | |
| expect(':'); | |
| expr = { | |
| type: Syntax.ConditionalExpression, | |
| test: expr, | |
| consequent: consequent, | |
| alternate: parseAssignmentExpression() | |
| }; | |
| } | |
| return expr; | |
| } | |
| // 11.13 Assignment Operators | |
| function parseAssignmentExpression() { | |
| var expr; | |
| expr = parseConditionalExpression(); | |
| if (matchAssign()) { | |
| // LeftHandSideExpression | |
| if (state.lastParenthesized !== expr && !isLeftHandSide(expr)) { | |
| throwError({}, Messages.InvalidLHSInAssignment); | |
| } | |
| // 11.13.1 | |
| if (strict && expr.type === Syntax.Identifier && isRestrictedWord(expr.name)) { | |
| throwError({}, Messages.StrictLHSAssignment); | |
| } | |
| expr = { | |
| type: Syntax.AssignmentExpression, | |
| operator: lex().value, | |
| left: expr, | |
| right: parseAssignmentExpression() | |
| }; | |
| } | |
| return expr; | |
| } | |
| // 11.14 Comma Operator | |
| function parseExpression() { | |
| var expr = parseAssignmentExpression(); | |
| if (match(',')) { | |
| expr = { | |
| type: Syntax.SequenceExpression, | |
| expressions: [ expr ] | |
| }; | |
| while (index < length) { | |
| if (!match(',')) { | |
| break; | |
| } | |
| lex(); | |
| expr.expressions.push(parseAssignmentExpression()); | |
| } | |
| } | |
| return expr; | |
| } | |
| // 12.1 Block | |
| function parseStatementList() { | |
| var list = [], | |
| statement; | |
| while (index < length) { | |
| if (match('}')) { | |
| break; | |
| } | |
| statement = checkMultilineParseSourceElement(); | |
| if (typeof statement === 'undefined') { | |
| break; | |
| } | |
| list.push(statement); | |
| } | |
| return list; | |
| } | |
| function parseBlock() { | |
| var block; | |
| expect('{'); | |
| block = parseStatementList(); | |
| expect('}'); | |
| return { | |
| type: Syntax.BlockStatement, | |
| body: block | |
| }; | |
| } | |
| // 12.2 Variable Statement | |
| function parseVariableIdentifier() { | |
| var token = lex(); | |
| if (token.type !== Token.Identifier) { | |
| throwUnexpected(token); | |
| } | |
| return { | |
| type: Syntax.Identifier, | |
| name: token.value | |
| }; | |
| } | |
| function parseVariableDeclaration(kind) { | |
| var id = parseVariableIdentifier(), | |
| init = null; | |
| // 12.2.1 | |
| if (strict && isRestrictedWord(id.name)) { | |
| throwErrorTolerant({}, Messages.StrictVarName); | |
| } | |
| if (kind === 'const') { | |
| expect('='); | |
| init = parseAssignmentExpression(); | |
| } else if (match('=')) { | |
| lex(); | |
| init = parseAssignmentExpression(); | |
| } | |
| return { | |
| type: Syntax.VariableDeclarator, | |
| id: id, | |
| init: init | |
| }; | |
| } | |
| function parseVariableDeclarationList(kind) { | |
| var list = []; | |
| while (index < length) { | |
| list.push(parseVariableDeclaration(kind)); | |
| if (!match(',')) { | |
| break; | |
| } | |
| lex(); | |
| } | |
| return list; | |
| } | |
| function parseVariableStatement() { | |
| var declarations; | |
| expectKeyword('var'); | |
| declarations = parseVariableDeclarationList(); | |
| consumeSemicolon(); | |
| return { | |
| type: Syntax.VariableDeclaration, | |
| declarations: declarations, | |
| kind: 'var' | |
| }; | |
| } | |
| // kind may be `const` or `let` | |
| // Both are experimental and not in the specification yet. | |
| // see http://wiki.ecmascript.org/doku.php?id=harmony:const | |
| // and http://wiki.ecmascript.org/doku.php?id=harmony:let | |
| function parseConstLetDeclaration(kind) { | |
| var declarations; | |
| expectKeyword(kind); | |
| declarations = parseVariableDeclarationList(kind); | |
| consumeSemicolon(); | |
| return { | |
| type: Syntax.VariableDeclaration, | |
| declarations: declarations, | |
| kind: kind | |
| }; | |
| } | |
| // 12.3 Empty Statement | |
| function parseEmptyStatement() { | |
| expect(';'); | |
| return { | |
| type: Syntax.EmptyStatement | |
| }; | |
| } | |
| // 12.4 Expression Statement | |
| function parseExpressionStatement() { | |
| var expr = parseExpression(); | |
| consumeSemicolon(); | |
| return { | |
| type: Syntax.ExpressionStatement, | |
| expression: expr | |
| }; | |
| } | |
| // 12.5 If statement | |
| function parseIfStatement() { | |
| var test, consequent, alternate; | |
| expectKeyword('if'); | |
| expect('('); | |
| test = parseExpression(); | |
| expect(')'); | |
| consequent = parseStatement(); | |
| if (matchKeyword('else')) { | |
| lex(); | |
| alternate = parseStatement(); | |
| } else { | |
| alternate = null; | |
| } | |
| return { | |
| type: Syntax.IfStatement, | |
| fully_wrapped: (consequent.type === Syntax.BlockStatement) | |
| && alternate | |
| && ((alternate.type === Syntax.BlockStatement) | |
| || (alternate.type === Syntax.IfStatement | |
| && alternate.fully_wrapped)), | |
| test: test, | |
| consequent: consequent, | |
| alternate: alternate | |
| }; | |
| } | |
| // 12.6 Iteration Statements | |
| function parseDoWhileStatement() { | |
| var body, test, oldInIteration; | |
| expectKeyword('do'); | |
| oldInIteration = state.inIteration; | |
| state.inIteration = true; | |
| body = parseStatement(); | |
| state.inIteration = oldInIteration; | |
| expectKeyword('while'); | |
| expect('('); | |
| test = parseExpression(); | |
| expect(')'); | |
| if (match(';')) { | |
| lex(); | |
| } | |
| return { | |
| type: Syntax.DoWhileStatement, | |
| fully_wrapped: true, | |
| body: body, | |
| test: test | |
| }; | |
| } | |
| function parseWhileStatement() { | |
| var test, body, oldInIteration; | |
| expectKeyword('while'); | |
| expect('('); | |
| test = parseExpression(); | |
| expect(')'); | |
| oldInIteration = state.inIteration; | |
| state.inIteration = true; | |
| body = parseStatement(); | |
| state.inIteration = oldInIteration; | |
| return { | |
| type: Syntax.WhileStatement, | |
| fully_wrapped: body.type === Syntax.BlockStatement, | |
| test: test, | |
| body: body | |
| }; | |
| } | |
| function parseForVariableDeclaration() { | |
| var token = lex(); | |
| return { | |
| type: Syntax.VariableDeclaration, | |
| declarations: parseVariableDeclarationList(), | |
| kind: token.value | |
| }; | |
| } | |
| function parseForStatement() { | |
| var init, test, update, left, right, body, oldInIteration; | |
| init = test = update = null; | |
| expectKeyword('for'); | |
| expect('('); | |
| if (match(';')) { | |
| lex(); | |
| } else { | |
| if (matchKeyword('var') || matchKeyword('let')) { | |
| state.allowIn = false; | |
| init = parseForVariableDeclaration(); | |
| state.allowIn = true; | |
| if (init.declarations.length === 1 && matchKeyword('in')) { | |
| lex(); | |
| left = init; | |
| right = parseExpression(); | |
| init = null; | |
| } | |
| } else { | |
| state.allowIn = false; | |
| init = parseExpression(); | |
| state.allowIn = true; | |
| if (matchKeyword('in')) { | |
| // LeftHandSideExpression | |
| if (matchKeyword('in') && (state.lastParenthesized !== init && !isLeftHandSide(init))) { | |
| throwError({}, Messages.InvalidLHSInForIn); | |
| } | |
| lex(); | |
| left = init; | |
| right = parseExpression(); | |
| init = null; | |
| } | |
| } | |
| if (typeof left === 'undefined') { | |
| expect(';'); | |
| } | |
| } | |
| if (typeof left === 'undefined') { | |
| if (!match(';')) { | |
| test = parseExpression(); | |
| } | |
| expect(';'); | |
| if (!match(')')) { | |
| update = parseExpression(); | |
| } | |
| } | |
| expect(')'); | |
| oldInIteration = state.inIteration; | |
| state.inIteration = true; | |
| body = parseStatement(); | |
| state.inIteration = oldInIteration; | |
| if (typeof left === 'undefined') { | |
| return { | |
| type: Syntax.ForStatement, | |
| fully_wrapped: body.type === Syntax.BlockStatement, | |
| init: init, | |
| test: test, | |
| update: update, | |
| body: body | |
| }; | |
| } | |
| return { | |
| type: Syntax.ForInStatement, | |
| fully_wrapped: body.type === Syntax.BlockStatement, | |
| left: left, | |
| right: right, | |
| body: body, | |
| each: false | |
| }; | |
| } | |
| // 12.7 The continue statement | |
| function parseContinueStatement() { | |
| var token, label = null; | |
| expectKeyword('continue'); | |
| // Optimize the most common form: 'continue;'. | |
| if (source[index] === ';') { | |
| lex(); | |
| if (!state.inIteration) { | |
| throwError({}, Messages.IllegalContinue); | |
| } | |
| return { | |
| type: Syntax.ContinueStatement, | |
| label: null | |
| }; | |
| } | |
| if (peekLineTerminator(true)) { | |
| if (!inIteration) { | |
| throwError({}, Messages.IllegalContinue); | |
| } | |
| return { | |
| type: Syntax.ContinueStatement, | |
| label: null | |
| }; | |
| } | |
| token = lookahead(); | |
| if (token.type === Token.Identifier) { | |
| label = parseVariableIdentifier(); | |
| if (!Object.prototype.hasOwnProperty.call(state.labelSet, label.name)) { | |
| throwError({}, Messages.UnknownLabel, label.name); | |
| } | |
| } | |
| consumeSemicolon(); | |
| if (label === null && !state.inIteration) { | |
| throwError({}, Messages.IllegalContinue); | |
| } | |
| return { | |
| type: Syntax.ContinueStatement, | |
| label: label | |
| }; | |
| } | |
| // 12.8 The break statement | |
| function parseBreakStatement() { | |
| var token, label = null; | |
| expectKeyword('break'); | |
| // Optimize the most common form: 'break;'. | |
| if (source[index] === ';') { | |
| lex(); | |
| if (!(state.inIteration || state.inSwitch)) { | |
| throwError({}, Messages.IllegalBreak); | |
| } | |
| return { | |
| type: Syntax.BreakStatement, | |
| label: null | |
| }; | |
| } | |
| if (peekLineTerminator(true)) { | |
| if (!(inIteration || inSwitch)) { | |
| throwError({}, Messages.IllegalBreak); | |
| } | |
| return { | |
| type: Syntax.BreakStatement, | |
| label: null | |
| }; | |
| } | |
| token = lookahead(); | |
| if (token.type === Token.Identifier) { | |
| label = parseVariableIdentifier(); | |
| if (!Object.prototype.hasOwnProperty.call(state.labelSet, label.name)) { | |
| throwError({}, Messages.UnknownLabel, label.name); | |
| } | |
| } | |
| consumeSemicolon(); | |
| if (label === null && !(state.inIteration || state.inSwitch)) { | |
| throwError({}, Messages.IllegalBreak); | |
| } | |
| return { | |
| type: Syntax.BreakStatement, | |
| label: label | |
| }; | |
| } | |
| // 12.9 The return statement | |
| function parseReturnStatement() { | |
| var token, argument = null; | |
| expectKeyword('return'); | |
| if (!state.inFunctionBody) { | |
| throwErrorTolerant({}, Messages.IllegalReturn); | |
| } | |
| // 'return' followed by a space and an identifier is very common. | |
| if (source[index] === ' ') { | |
| if (isIdentifierStart(source[index + 1])) { | |
| argument = parseExpression(); | |
| consumeSemicolon(); | |
| return { | |
| type: Syntax.ReturnStatement, | |
| fully_wrapped: (argument.type === Syntax.ObjectExpression) | |
| || (argument.type === Syntax.FunctionExpression), | |
| argument: argument | |
| }; | |
| } | |
| } | |
| if (peekLineTerminator(true)) { | |
| return { | |
| type: Syntax.ReturnStatement, | |
| argument: null | |
| }; | |
| } | |
| if (!match(';')) { | |
| token = lookahead(); | |
| if (!match('}') && token.type !== Token.EOF) { | |
| argument = parseExpression(); | |
| } | |
| } | |
| consumeSemicolon(); | |
| return { | |
| type: Syntax.ReturnStatement, | |
| fully_wrapped: argument | |
| && ((argument.type === Syntax.ObjectExpression) | |
| || (argument.type === Syntax.FunctionExpression)), | |
| argument: argument | |
| }; | |
| } | |
| // 12.10 The with statement | |
| function parseWithStatement() { | |
| var object, body; | |
| if (strict) { | |
| throwErrorTolerant({}, Messages.StrictModeWith); | |
| } | |
| expectKeyword('with'); | |
| expect('('); | |
| object = parseExpression(); | |
| expect(')'); | |
| body = parseStatement(); | |
| return { | |
| type: Syntax.WithStatement, | |
| object: object, | |
| body: body | |
| }; | |
| } | |
| // 12.10 The swith statement | |
| function parseSwitchCase() { | |
| var test, | |
| consequent = [], | |
| statement; | |
| if (matchKeyword('default')) { | |
| lex(); | |
| test = null; | |
| } else { | |
| expectKeyword('case'); | |
| test = parseExpression(); | |
| } | |
| expect(':'); | |
| while (index < length) { | |
| if (match('}') || matchKeyword('default') || matchKeyword('case')) { | |
| break; | |
| } | |
| statement = parseStatement(); | |
| if (typeof statement === 'undefined') { | |
| break; | |
| } | |
| consequent.push(statement); | |
| } | |
| return { | |
| type: Syntax.SwitchCase, | |
| test: test, | |
| consequent: consequent | |
| }; | |
| } | |
| function parseSwitchStatement() { | |
| var discriminant, cases, oldInSwitch; | |
| expectKeyword('switch'); | |
| expect('('); | |
| discriminant = parseExpression(); | |
| expect(')'); | |
| expect('{'); | |
| if (match('}')) { | |
| lex(); | |
| return { | |
| type: Syntax.SwitchStatement, | |
| fully_wrapped: true, | |
| discriminant: discriminant | |
| }; | |
| } | |
| cases = []; | |
| oldInSwitch = state.inSwitch; | |
| state.inSwitch = true; | |
| while (index < length) { | |
| if (match('}')) { | |
| break; | |
| } | |
| cases.push(parseSwitchCase()); | |
| } | |
| state.inSwitch = oldInSwitch; | |
| expect('}'); | |
| return { | |
| type: Syntax.SwitchStatement, | |
| fully_wrapped: true, | |
| discriminant: discriminant, | |
| cases: cases | |
| }; | |
| } | |
| // 12.13 The throw statement | |
| function parseThrowStatement() { | |
| var argument; | |
| expectKeyword('throw'); | |
| if (peekLineTerminator(true)) { | |
| throwError({}, Messages.NewlineAfterThrow); | |
| } | |
| argument = parseExpression(); | |
| consumeSemicolon(); | |
| return { | |
| type: Syntax.ThrowStatement, | |
| argument: argument | |
| }; | |
| } | |
| // 12.14 The try statement | |
| function parseCatchClause() { | |
| var param; | |
| expectKeyword('catch'); | |
| expect('('); | |
| if (!match(')')) { | |
| param = parseExpression(); | |
| // 12.14.1 | |
| if (strict && param.type === Syntax.Identifier && isRestrictedWord(param.name)) { | |
| throwErrorTolerant({}, Messages.StrictCatchVariable); | |
| } | |
| } | |
| expect(')'); | |
| return { | |
| type: Syntax.CatchClause, | |
| param: param, | |
| guard: null, | |
| body: parseBlock() | |
| }; | |
| } | |
| function parseTryStatement() { | |
| var block, handlers = [], finalizer = null; | |
| expectKeyword('try'); | |
| block = parseBlock(); | |
| if (matchKeyword('catch')) { | |
| handlers.push(parseCatchClause()); | |
| } | |
| if (matchKeyword('finally')) { | |
| lex(); | |
| finalizer = parseBlock(); | |
| } | |
| if (handlers.length === 0 && !finalizer) { | |
| throwError({}, Messages.NoCatchOrFinally); | |
| } | |
| return { | |
| type: Syntax.TryStatement, | |
| fully_wrapped: true, | |
| block: block, | |
| handlers: handlers, | |
| finalizer: finalizer | |
| }; | |
| } | |
| // 12.15 The debugger statement | |
| function parseDebuggerStatement() { | |
| expectKeyword('debugger'); | |
| consumeSemicolon(); | |
| return { | |
| type: Syntax.DebuggerStatement | |
| }; | |
| } | |
| // 12 Statements | |
| function parseStatement() { | |
| var token = lookahead(), | |
| expr, | |
| labeledBody; | |
| if (token.type === Token.EOF) { | |
| throwUnexpected(token); | |
| } | |
| if (token.type === Token.Punctuator) { | |
| switch (token.value) { | |
| case ';': | |
| return parseEmptyStatement(); | |
| case '{': | |
| return parseBlock(); | |
| case '(': | |
| return parseExpressionStatement(); | |
| default: | |
| break; | |
| } | |
| } | |
| if (token.type === Token.Keyword) { | |
| switch (token.value) { | |
| case 'break': | |
| return parseBreakStatement(); | |
| case 'continue': | |
| return parseContinueStatement(); | |
| case 'debugger': | |
| return parseDebuggerStatement(); | |
| case 'do': | |
| return parseDoWhileStatement(); | |
| case 'for': | |
| return parseForStatement(); | |
| case 'function': | |
| return parseFunctionDeclaration(); | |
| case 'if': | |
| return parseIfStatement(); | |
| case 'return': | |
| return parseReturnStatement(); | |
| case 'switch': | |
| return parseSwitchStatement(); | |
| case 'throw': | |
| return parseThrowStatement(); | |
| case 'try': | |
| return parseTryStatement(); | |
| case 'var': | |
| return parseVariableStatement(); | |
| case 'while': | |
| return parseWhileStatement(); | |
| case 'with': | |
| return parseWithStatement(); | |
| default: | |
| break; | |
| } | |
| } | |
| expr = parseExpression(); | |
| // 12.12 Labelled Statements | |
| if ((expr.type === Syntax.Identifier) && match(':')) { | |
| lex(); | |
| if (Object.prototype.hasOwnProperty.call(state.labelSet, expr.name)) { | |
| throwError({}, Messages.Redeclaration, 'Label', expr.name); | |
| } | |
| state.labelSet[expr.name] = true; | |
| labeledBody = parseStatement(); | |
| delete state.labelSet[expr.name]; | |
| return { | |
| type: Syntax.LabeledStatement, | |
| label: expr, | |
| body: labeledBody | |
| }; | |
| } | |
| consumeSemicolon(); | |
| return { | |
| type: Syntax.ExpressionStatement, | |
| expression: expr | |
| }; | |
| } | |
| // 13 Function Definition | |
| function parseFunctionSourceElements() { | |
| var sourceElement, sourceElements = [], token, directive, firstRestricted, | |
| oldLabelSet, oldInIteration, oldInSwitch, oldInFunctionBody; | |
| expect('{'); | |
| while (index < length) { | |
| token = lookahead(); | |
| if (token.type !== Token.StringLiteral) { | |
| break; | |
| } | |
| sourceElement = checkMultilineParseSourceElement(); | |
| sourceElements.push(sourceElement); | |
| if (sourceElement.expression.type !== Syntax.Literal) { | |
| // this is not directive | |
| break; | |
| } | |
| directive = sliceSource(token.range[0] + 1, token.range[1] - 1); | |
| if (directive === 'use strict') { | |
| strict = true; | |
| if (firstRestricted) { | |
| throwError(firstRestricted, Messages.StrictOctalLiteral); | |
| } | |
| } else { | |
| if (!firstRestricted && token.octal) { | |
| firstRestricted = token; | |
| } | |
| } | |
| } | |
| oldLabelSet = state.labelSet; | |
| oldInIteration = state.inIteration; | |
| oldInSwitch = state.inSwitch; | |
| oldInFunctionBody = state.inFunctionBody; | |
| state.labelSet = {}; | |
| state.inIteration = false; | |
| state.inSwitch = false; | |
| state.inFunctionBody = true; | |
| while (index < length) { | |
| if (match('}')) { | |
| break; | |
| } | |
| sourceElement = checkMultilineParseSourceElement(); | |
| if (typeof sourceElement === 'undefined') { | |
| break; | |
| } | |
| sourceElements.push(sourceElement); | |
| } | |
| expect('}'); | |
| state.labelSet = oldLabelSet; | |
| state.inIteration = oldInIteration; | |
| state.inSwitch = oldInSwitch; | |
| state.inFunctionBody = oldInFunctionBody; | |
| return { | |
| type: Syntax.BlockStatement, | |
| body: sourceElements | |
| }; | |
| } | |
| function parseFunctionDeclaration() { | |
| var id, param, params = [], body, token, firstRestricted, message, previousStrict, paramSet; | |
| expectKeyword('function'); | |
| token = lookahead(); | |
| id = parseVariableIdentifier(); | |
| if (strict) { | |
| if (isRestrictedWord(token.value)) { | |
| throwError(token, Messages.StrictFunctionName); | |
| } | |
| } else { | |
| if (isRestrictedWord(token.value)) { | |
| firstRestricted = token; | |
| message = Messages.StrictFunctionName; | |
| } else if (isStrictModeReservedWord(token.value)) { | |
| firstRestricted = token; | |
| message = Messages.StrictReservedWord; | |
| } | |
| } | |
| expect('('); | |
| if (!match(')')) { | |
| paramSet = {}; | |
| while (index < length) { | |
| token = lookahead(); | |
| param = parseVariableIdentifier(); | |
| if (strict) { | |
| if (isRestrictedWord(token.value)) { | |
| throwError(token, Messages.StrictParamName); | |
| } | |
| if (Object.prototype.hasOwnProperty.call(paramSet, token.value)) { | |
| throwError(token, Messages.StrictParamDupe); | |
| } | |
| } else if (!firstRestricted) { | |
| if (isRestrictedWord(token.value)) { | |
| firstRestricted = token; | |
| message = Messages.StrictParamName; | |
| } else if (isStrictModeReservedWord(token.value)) { | |
| firstRestricted = token; | |
| message = Messages.StrictReservedWord; | |
| } else if (Object.prototype.hasOwnProperty.call(paramSet, token.value)) { | |
| firstRestricted = token; | |
| message = Messages.StrictParamDupe; | |
| } | |
| } | |
| params.push(param); | |
| paramSet[param.name] = true; | |
| if (match(')')) { | |
| break; | |
| } | |
| expect(','); | |
| } | |
| } | |
| expect(')'); | |
| previousStrict = strict; | |
| body = parseFunctionSourceElements(); | |
| if (strict && firstRestricted) { | |
| throwError(firstRestricted, message); | |
| } | |
| strict = previousStrict; | |
| return { | |
| type: Syntax.FunctionDeclaration, | |
| fully_wrapped: true, | |
| id: id, | |
| params: params, | |
| body: body | |
| }; | |
| } | |
| function parseFunctionExpression() { | |
| var token, id = null, firstRestricted, message, param, params = [], body, previousStrict, paramSet; | |
| expectKeyword('function'); | |
| if (!match('(')) { | |
| token = lookahead(); | |
| id = parseVariableIdentifier(); | |
| if (strict) { | |
| if (isRestrictedWord(token.value)) { | |
| throwError(token, Messages.StrictFunctionName); | |
| } | |
| } else { | |
| if (isRestrictedWord(token.value)) { | |
| firstRestricted = token; | |
| message = Messages.StrictFunctionName; | |
| } else if (isStrictModeReservedWord(token.value)) { | |
| firstRestricted = token; | |
| message = Messages.StrictReservedWord; | |
| } | |
| } | |
| } | |
| expect('('); | |
| if (!match(')')) { | |
| paramSet = {}; | |
| while (index < length) { | |
| token = lookahead(); | |
| param = parseVariableIdentifier(); | |
| if (strict) { | |
| if (isRestrictedWord(token.value)) { | |
| throwError(token, Messages.StrictParamName); | |
| } | |
| if (Object.prototype.hasOwnProperty.call(paramSet, token.value)) { | |
| throwError(token, Messages.StrictParamDupe); | |
| } | |
| } else if (!firstRestricted) { | |
| if (isRestrictedWord(token.value)) { | |
| firstRestricted = token; | |
| message = Messages.StrictParamName; | |
| } else if (isStrictModeReservedWord(token.value)) { | |
| firstRestricted = token; | |
| message = Messages.StrictReservedWord; | |
| } else if (Object.prototype.hasOwnProperty.call(paramSet, token.value)) { | |
| firstRestricted = token; | |
| message = Messages.StrictParamDupe; | |
| } | |
| } | |
| params.push(param); | |
| paramSet[param.name] = true; | |
| if (match(')')) { | |
| break; | |
| } | |
| expect(','); | |
| } | |
| } | |
| expect(')'); | |
| previousStrict = strict; | |
| body = parseFunctionSourceElements(); | |
| if (strict && firstRestricted) { | |
| throwError(firstRestricted, message); | |
| } | |
| strict = previousStrict; | |
| return { | |
| type: Syntax.FunctionExpression, | |
| id: id, | |
| params: params, | |
| body: body | |
| }; | |
| } | |
| // 14 Program | |
| function checkMultilineParseSourceElement() { | |
| skipComment(); | |
| var line = lineNumber; | |
| var result = parseSourceElement(); | |
| if (extra.multiline_warnings) { | |
| if (result && result.fully_wrapped) return result; | |
| var lines = []; | |
| if (lineNumber > line) { | |
| for (var i=line+1; i<=lineNumber; i++) | |
| if (!asi[i-1] && (indents[i]===indents[line])) | |
| lines.push("line "+i+"("+indents[i]+")"); | |
| if (lines.length>0) { | |
| console.log("multiline "+result.type+" "+line+"("+indents[line] | |
| +"), not indented: "+lines.join("-")); | |
| } | |
| } | |
| } | |
| return result; | |
| } | |
| function parseSourceElement() { | |
| var token = lookahead(); | |
| if (token.type === Token.Keyword) { | |
| switch (token.value) { | |
| case 'const': | |
| case 'let': | |
| return parseConstLetDeclaration(token.value); | |
| case 'function': | |
| return parseFunctionDeclaration(); | |
| default: | |
| return parseStatement(); | |
| } | |
| } | |
| if (token.type !== Token.EOF) { | |
| return parseStatement(); | |
| } | |
| } | |
| function parseSourceElements() { | |
| var sourceElement, sourceElements = [], token, directive, firstRestricted; | |
| while (index < length) { | |
| token = lookahead(); | |
| if (token.type !== Token.StringLiteral) { | |
| break; | |
| } | |
| sourceElement = checkMultilineParseSourceElement(); | |
| sourceElements.push(sourceElement); | |
| if (sourceElement.expression.type !== Syntax.Literal) { | |
| // this is not directive | |
| break; | |
| } | |
| directive = sliceSource(token.range[0] + 1, token.range[1] - 1); | |
| if (directive === 'use strict') { | |
| strict = true; | |
| if (firstRestricted) { | |
| throwError(firstRestricted, Messages.StrictOctalLiteral); | |
| } | |
| } else { | |
| if (!firstRestricted && token.octal) { | |
| firstRestricted = token; | |
| } | |
| } | |
| } | |
| while (index < length) { | |
| sourceElement = checkMultilineParseSourceElement(); | |
| if (typeof sourceElement === 'undefined') { | |
| break; | |
| } | |
| sourceElements.push(sourceElement); | |
| } | |
| return sourceElements; | |
| } | |
| function parseProgram() { | |
| var program; | |
| strict = false; | |
| program = { | |
| type: Syntax.Program, | |
| body: parseSourceElements() | |
| }; | |
| return program; | |
| } | |
| // The following functions are needed only when the option to preserve | |
| // the comments is active. | |
| function addComment(start, end, type, value) { | |
| assert(typeof start === 'number', 'Comment must have valid position'); | |
| // Because the way the actual token is scanned, often the comments | |
| // (if any) are skipped twice during the lexical analysis. | |
| // Thus, we need to skip adding a comment if the comment array already | |
| // handled it. | |
| if (extra.comments.length > 0) { | |
| if (extra.comments[extra.comments.length - 1].range[1] > start) { | |
| return; | |
| } | |
| } | |
| extra.comments.push({ | |
| range: [start, end], | |
| type: type, | |
| value: value | |
| }); | |
| } | |
| function scanComment() { | |
| var comment, ch, start, blockComment, lineComment; | |
| comment = ''; | |
| blockComment = false; | |
| lineComment = false; | |
| while (index < length) { | |
| ch = source[index]; | |
| if (lineComment) { | |
| ch = nextChar(); | |
| if (index >= length) { | |
| lineComment = false; | |
| comment += ch; | |
| addComment(start, index, 'Line', comment); | |
| } else if (isLineTerminator(ch)) { | |
| lineComment = false; | |
| addComment(start, index, 'Line', comment); | |
| if (ch === '\r' && source[index] === '\n') { | |
| ++index; | |
| } | |
| ++lineNumber; | |
| lineStart = index; | |
| comment = ''; | |
| } else { | |
| comment += ch; | |
| } | |
| } else if (blockComment) { | |
| if (isLineTerminator(ch)) { | |
| if (ch === '\r' && source[index + 1] === '\n') { | |
| ++index; | |
| comment += '\r\n'; | |
| } else { | |
| comment += ch; | |
| } | |
| ++lineNumber; | |
| ++index; | |
| lineStart = index; | |
| if (index >= length) { | |
| throwError({}, Messages.UnexpectedToken, 'ILLEGAL'); | |
| } | |
| } else { | |
| ch = nextChar(); | |
| if (index >= length) { | |
| throwError({}, Messages.UnexpectedToken, 'ILLEGAL'); | |
| } | |
| comment += ch; | |
| if (ch === '*') { | |
| ch = source[index]; | |
| if (ch === '/') { | |
| comment = comment.substr(0, comment.length - 1); | |
| blockComment = false; | |
| ++index; | |
| addComment(start, index, 'Block', comment); | |
| comment = ''; | |
| } | |
| } | |
| } | |
| } else if (ch === '/') { | |
| ch = source[index + 1]; | |
| if (ch === '/') { | |
| start = index; | |
| index += 2; | |
| lineComment = true; | |
| } else if (ch === '*') { | |
| start = index; | |
| index += 2; | |
| blockComment = true; | |
| if (index >= length) { | |
| throwError({}, Messages.UnexpectedToken, 'ILLEGAL'); | |
| } | |
| } else { | |
| break; | |
| } | |
| } else if (isWhiteSpace(ch)) { | |
| ++index; | |
| } else if (isLineTerminator(ch)) { | |
| ++index; | |
| if (ch === '\r' && source[index] === '\n') { | |
| ++index; | |
| } | |
| ++lineNumber; | |
| lineStart = index; | |
| } else { | |
| break; | |
| } | |
| } | |
| } | |
| function collectToken() { | |
| var token = extra.advance(), | |
| range, | |
| value; | |
| if (token.type !== Token.EOF) { | |
| range = [token.range[0], token.range[1]]; | |
| value = sliceSource(token.range[0], token.range[1]); | |
| extra.tokens.push({ | |
| type: TokenName[token.type], | |
| value: value, | |
| range: range | |
| }); | |
| } | |
| return token; | |
| } | |
| function collectRegex() { | |
| var pos, regex, token; | |
| skipComment(); | |
| pos = index; | |
| regex = extra.scanRegExp(); | |
| // Pop the previous token, which is likely '/' or '/=' | |
| if (extra.tokens.length > 0) { | |
| token = extra.tokens[extra.tokens.length - 1]; | |
| if (token.range[0] === pos && token.type === 'Punctuator') { | |
| if (token.value === '/' || token.value === '/=') { | |
| extra.tokens.pop(); | |
| } | |
| } | |
| } | |
| extra.tokens.push({ | |
| type: 'RegularExpression', | |
| value: regex.literal, | |
| range: [pos, index] | |
| }); | |
| return regex; | |
| } | |
| function createLiteral(token) { | |
| return { | |
| type: Syntax.Literal, | |
| value: token.value | |
| }; | |
| } | |
| function createRawLiteral(token) { | |
| return { | |
| type: Syntax.Literal, | |
| value: token.value, | |
| raw: sliceSource(token.range[0], token.range[1]) | |
| }; | |
| } | |
| function wrapTrackingFunction(range, loc) { | |
| return function (parseFunction) { | |
| function isBinary(node) { | |
| return node.type === Syntax.LogicalExpression || | |
| node.type === Syntax.BinaryExpression; | |
| } | |
| function visit(node) { | |
| if (isBinary(node.left)) { | |
| visit(node.left); | |
| } | |
| if (isBinary(node.right)) { | |
| visit(node.right); | |
| } | |
| if (range && typeof node.range === 'undefined') { | |
| node.range = [node.left.range[0], node.right.range[1]]; | |
| } | |
| if (loc && typeof node.loc === 'undefined') { | |
| node.loc = { | |
| start: node.left.loc.start, | |
| end: node.right.loc.end | |
| }; | |
| } | |
| } | |
| return function () { | |
| var node, rangeInfo, locInfo; | |
| skipComment(); | |
| rangeInfo = [index, 0]; | |
| locInfo = { | |
| start: { | |
| line: lineNumber, | |
| column: index - lineStart | |
| } | |
| }; | |
| node = parseFunction.apply(null, arguments); | |
| if (typeof node !== 'undefined') { | |
| if (range) { | |
| rangeInfo[1] = index; | |
| node.range = rangeInfo; | |
| } | |
| if (loc) { | |
| locInfo.end = { | |
| line: lineNumber, | |
| column: index - lineStart | |
| }; | |
| node.loc = locInfo; | |
| } | |
| if (isBinary(node)) { | |
| visit(node); | |
| } | |
| if (node.type === Syntax.MemberExpression) { | |
| if (typeof node.object.range !== 'undefined') { | |
| node.range[0] = node.object.range[0]; | |
| } | |
| if (typeof node.object.loc !== 'undefined') { | |
| node.loc.start = node.object.loc.start; | |
| } | |
| } | |
| return node; | |
| } | |
| }; | |
| }; | |
| } | |
| function patch() { | |
| var wrapTracking; | |
| if (extra.comments) { | |
| extra.skipComment = skipComment; | |
| skipComment = scanComment; | |
| } | |
| if (extra.raw) { | |
| extra.createLiteral = createLiteral; | |
| createLiteral = createRawLiteral; | |
| } | |
| if (extra.range || extra.loc) { | |
| wrapTracking = wrapTrackingFunction(extra.range, extra.loc); | |
| extra.parseAdditiveExpression = parseAdditiveExpression; | |
| extra.parseAssignmentExpression = parseAssignmentExpression; | |
| extra.parseBitwiseANDExpression = parseBitwiseANDExpression; | |
| extra.parseBitwiseORExpression = parseBitwiseORExpression; | |
| extra.parseBitwiseXORExpression = parseBitwiseXORExpression; | |
| extra.parseBlock = parseBlock; | |
| extra.parseFunctionSourceElements = parseFunctionSourceElements; | |
| extra.parseCallMember = parseCallMember; | |
| extra.parseCatchClause = parseCatchClause; | |
| extra.parseComputedMember = parseComputedMember; | |
| extra.parseConditionalExpression = parseConditionalExpression; | |
| extra.parseConstLetDeclaration = parseConstLetDeclaration; | |
| extra.parseEqualityExpression = parseEqualityExpression; | |
| extra.parseExpression = parseExpression; | |
| extra.parseForVariableDeclaration = parseForVariableDeclaration; | |
| extra.parseFunctionDeclaration = parseFunctionDeclaration; | |
| extra.parseFunctionExpression = parseFunctionExpression; | |
| extra.parseLogicalANDExpression = parseLogicalANDExpression; | |
| extra.parseLogicalORExpression = parseLogicalORExpression; | |
| extra.parseMultiplicativeExpression = parseMultiplicativeExpression; | |
| extra.parseNewExpression = parseNewExpression; | |
| extra.parseNonComputedMember = parseNonComputedMember; | |
| extra.parseNonComputedProperty = parseNonComputedProperty; | |
| extra.parseObjectProperty = parseObjectProperty; | |
| extra.parseObjectPropertyKey = parseObjectPropertyKey; | |
| extra.parsePostfixExpression = parsePostfixExpression; | |
| extra.parsePrimaryExpression = parsePrimaryExpression; | |
| extra.parseProgram = parseProgram; | |
| extra.parsePropertyFunction = parsePropertyFunction; | |
| extra.parseRelationalExpression = parseRelationalExpression; | |
| extra.parseStatement = parseStatement; | |
| extra.parseShiftExpression = parseShiftExpression; | |
| extra.parseSwitchCase = parseSwitchCase; | |
| extra.parseUnaryExpression = parseUnaryExpression; | |
| extra.parseVariableDeclaration = parseVariableDeclaration; | |
| extra.parseVariableIdentifier = parseVariableIdentifier; | |
| parseAdditiveExpression = wrapTracking(extra.parseAdditiveExpression); | |
| parseAssignmentExpression = wrapTracking(extra.parseAssignmentExpression); | |
| parseBitwiseANDExpression = wrapTracking(extra.parseBitwiseANDExpression); | |
| parseBitwiseORExpression = wrapTracking(extra.parseBitwiseORExpression); | |
| parseBitwiseXORExpression = wrapTracking(extra.parseBitwiseXORExpression); | |
| parseBlock = wrapTracking(extra.parseBlock); | |
| parseFunctionSourceElements = wrapTracking(extra.parseFunctionSourceElements); | |
| parseCallMember = wrapTracking(extra.parseCallMember); | |
| parseCatchClause = wrapTracking(extra.parseCatchClause); | |
| parseComputedMember = wrapTracking(extra.parseComputedMember); | |
| parseConditionalExpression = wrapTracking(extra.parseConditionalExpression); | |
| parseConstLetDeclaration = wrapTracking(extra.parseConstLetDeclaration); | |
| parseEqualityExpression = wrapTracking(extra.parseEqualityExpression); | |
| parseExpression = wrapTracking(extra.parseExpression); | |
| parseForVariableDeclaration = wrapTracking(extra.parseForVariableDeclaration); | |
| parseFunctionDeclaration = wrapTracking(extra.parseFunctionDeclaration); | |
| parseFunctionExpression = wrapTracking(extra.parseFunctionExpression); | |
| parseLogicalANDExpression = wrapTracking(extra.parseLogicalANDExpression); | |
| parseLogicalORExpression = wrapTracking(extra.parseLogicalORExpression); | |
| parseMultiplicativeExpression = wrapTracking(extra.parseMultiplicativeExpression); | |
| parseNewExpression = wrapTracking(extra.parseNewExpression); | |
| parseNonComputedMember = wrapTracking(extra.parseNonComputedMember); | |
| parseNonComputedProperty = wrapTracking(extra.parseNonComputedProperty); | |
| parseObjectProperty = wrapTracking(extra.parseObjectProperty); | |
| parseObjectPropertyKey = wrapTracking(extra.parseObjectPropertyKey); | |
| parsePostfixExpression = wrapTracking(extra.parsePostfixExpression); | |
| parsePrimaryExpression = wrapTracking(extra.parsePrimaryExpression); | |
| parseProgram = wrapTracking(extra.parseProgram); | |
| parsePropertyFunction = wrapTracking(extra.parsePropertyFunction); | |
| parseRelationalExpression = wrapTracking(extra.parseRelationalExpression); | |
| parseStatement = wrapTracking(extra.parseStatement); | |
| parseShiftExpression = wrapTracking(extra.parseShiftExpression); | |
| parseSwitchCase = wrapTracking(extra.parseSwitchCase); | |
| parseUnaryExpression = wrapTracking(extra.parseUnaryExpression); | |
| parseVariableDeclaration = wrapTracking(extra.parseVariableDeclaration); | |
| parseVariableIdentifier = wrapTracking(extra.parseVariableIdentifier); | |
| } | |
| if (typeof extra.tokens !== 'undefined') { | |
| extra.advance = advance; | |
| extra.scanRegExp = scanRegExp; | |
| advance = collectToken; | |
| scanRegExp = collectRegex; | |
| } | |
| } | |
| function unpatch() { | |
| if (typeof extra.skipComment === 'function') { | |
| skipComment = extra.skipComment; | |
| } | |
| if (extra.raw) { | |
| createLiteral = extra.createLiteral; | |
| } | |
| if (extra.range || extra.loc) { | |
| parseAdditiveExpression = extra.parseAdditiveExpression; | |
| parseAssignmentExpression = extra.parseAssignmentExpression; | |
| parseBitwiseANDExpression = extra.parseBitwiseANDExpression; | |
| parseBitwiseORExpression = extra.parseBitwiseORExpression; | |
| parseBitwiseXORExpression = extra.parseBitwiseXORExpression; | |
| parseBlock = extra.parseBlock; | |
| parseFunctionSourceElements = extra.parseFunctionSourceElements; | |
| parseCallMember = extra.parseCallMember; | |
| parseCatchClause = extra.parseCatchClause; | |
| parseComputedMember = extra.parseComputedMember; | |
| parseConditionalExpression = extra.parseConditionalExpression; | |
| parseConstLetDeclaration = extra.parseConstLetDeclaration; | |
| parseEqualityExpression = extra.parseEqualityExpression; | |
| parseExpression = extra.parseExpression; | |
| parseForVariableDeclaration = extra.parseForVariableDeclaration; | |
| parseFunctionDeclaration = extra.parseFunctionDeclaration; | |
| parseFunctionExpression = extra.parseFunctionExpression; | |
| parseLogicalANDExpression = extra.parseLogicalANDExpression; | |
| parseLogicalORExpression = extra.parseLogicalORExpression; | |
| parseMultiplicativeExpression = extra.parseMultiplicativeExpression; | |
| parseNewExpression = extra.parseNewExpression; | |
| parseNonComputedMember = extra.parseNonComputedMember; | |
| parseNonComputedProperty = extra.parseNonComputedProperty; | |
| parseObjectProperty = extra.parseObjectProperty; | |
| parseObjectPropertyKey = extra.parseObjectPropertyKey; | |
| parsePrimaryExpression = extra.parsePrimaryExpression; | |
| parsePostfixExpression = extra.parsePostfixExpression; | |
| parseProgram = extra.parseProgram; | |
| parsePropertyFunction = extra.parsePropertyFunction; | |
| parseRelationalExpression = extra.parseRelationalExpression; | |
| parseStatement = extra.parseStatement; | |
| parseShiftExpression = extra.parseShiftExpression; | |
| parseSwitchCase = extra.parseSwitchCase; | |
| parseUnaryExpression = extra.parseUnaryExpression; | |
| parseVariableDeclaration = extra.parseVariableDeclaration; | |
| parseVariableIdentifier = extra.parseVariableIdentifier; | |
| } | |
| if (typeof extra.scanRegExp === 'function') { | |
| advance = extra.advance; | |
| scanRegExp = extra.scanRegExp; | |
| } | |
| } | |
| function stringToArray(str) { | |
| var length = str.length, | |
| result = [], | |
| i; | |
| for (i = 0; i < length; ++i) { | |
| result[i] = str.charAt(i); | |
| } | |
| return result; | |
| } | |
| function parse(code, options) { | |
| var program, toString; | |
| toString = String; | |
| if (typeof code !== 'string' && !(code instanceof String)) { | |
| code = toString(code); | |
| } | |
| source = code; | |
| index = 0; | |
| lineNumber = (source.length > 0) ? 1 : 0; | |
| lineStart = 0; | |
| length = source.length; | |
| buffer = null; | |
| state = { | |
| allowIn: true, | |
| labelSet: {}, | |
| lastParenthesized: null, | |
| inFunctionBody: false, | |
| inIteration: false, | |
| inSwitch: false | |
| }; | |
| extra = {}; | |
| if (typeof options !== 'undefined') { | |
| extra.range = (typeof options.range === 'boolean') && options.range; | |
| extra.loc = (typeof options.loc === 'boolean') && options.loc; | |
| extra.raw = (typeof options.raw === 'boolean') && options.raw; | |
| if (typeof options.tokens === 'boolean' && options.tokens) { | |
| extra.tokens = []; | |
| } | |
| if (typeof options.comment === 'boolean' && options.comment) { | |
| extra.comments = []; | |
| } | |
| extra.asi = options.asi; | |
| extra.multiline_warnings = options.multiline_warnings; | |
| if (typeof options.tolerant === 'boolean' && options.tolerant) { | |
| extra.errors = []; | |
| } | |
| } | |
| if (length > 0) { | |
| if (typeof source[0] === 'undefined') { | |
| // Try first to convert to a string. This is good as fast path | |
| // for old IE which understands string indexing for string | |
| // literals only and not for string object. | |
| if (code instanceof String) { | |
| source = code.valueOf(); | |
| } | |
| // Force accessing the characters via an array. | |
| if (typeof source[0] === 'undefined') { | |
| source = stringToArray(code); | |
| } | |
| } | |
| } | |
| patch(); | |
| try { | |
| program = parseProgram(); | |
| if (typeof extra.comments !== 'undefined') { | |
| program.comments = extra.comments; | |
| } | |
| if (typeof extra.tokens !== 'undefined') { | |
| program.tokens = extra.tokens; | |
| } | |
| if (typeof extra.errors !== 'undefined') { | |
| program.errors = extra.errors; | |
| } | |
| } catch (e) { | |
| throw e; | |
| } finally { | |
| unpatch(); | |
| extra = {}; | |
| } | |
| return program; | |
| } | |
| // Sync with package.json. | |
| exports.version = '1.0.0-dev'; | |
| exports.parse = parse; | |
| // Deep copy. | |
| exports.Syntax = (function () { | |
| var name, types = {}; | |
| if (typeof Object.create === 'function') { | |
| types = Object.create(null); | |
| } | |
| for (name in Syntax) { | |
| if (Syntax.hasOwnProperty(name)) { | |
| types[name] = Syntax[name]; | |
| } | |
| } | |
| if (typeof Object.freeze === 'function') { | |
| Object.freeze(types); | |
| } | |
| return types; | |
| }()); | |
| }(typeof exports === 'undefined' ? (esprima = {}) : exports)); | |
| /* vim: set sw=4 ts=4 et tw=80 : */ |
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| // examples | |
| function restricted_production() { | |
| return //; | |
| "hi"; // warn here | |
| return //; | |
| "hi"; // don't warn here | |
| } | |
| function newline_no_asi() { | |
| var x = ["hi"] | |
| [1]; // warn here | |
| var y = ["hi"] | |
| [1]; // don't warn here | |
| } | |
| function newline_error_asi(alp,ha) { | |
| var a1 = "hi"+ | |
| "ho"; // don't warn here | |
| var a2 = "hi"+ | |
| "ho"; // warn here | |
| var a3 = "hi" | |
| +"ho"; // warn here | |
| var b1 = "hi" //; | |
| "ho"; // warn here | |
| var b2 = "hi" //; | |
| "ho"; // don't warn here | |
| } | |
| function continued_statements() { | |
| if (condition) { | |
| } else { // don't warn here | |
| } // don't warn here | |
| if (condition) f | |
| [1] // warn here | |
| if (condition) f | |
| [1] // don't warn here | |
| if (condition) f | |
| () // warn here | |
| if (condition) f | |
| () // don't warn here | |
| if (condition) return | |
| "" // warn here | |
| if (condition) return | |
| "" // don't warn here | |
| // don't warn here (comment/empty multiline) | |
| while (condition) { | |
| } // don't warn here | |
| while (condition) f | |
| () // warn here | |
| function f() { | |
| } // don't warn here | |
| } |
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