| /* |
| Copyright (c) jQuery Foundation, Inc. and Contributors, All Rights Reserved. |
| |
| 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. |
| */ |
| |
| (function (root, factory) { |
| 'use strict'; |
| |
| // Universal Module Definition (UMD) to support AMD, CommonJS/Node.js, |
| // Rhino, and plain browser loading. |
| |
| /* istanbul ignore next */ |
| if (typeof define === 'function' && define.amd) { |
| define(['exports'], factory); |
| } else if (typeof exports !== 'undefined') { |
| factory(exports); |
| } else { |
| factory((root.esprima = {})); |
| } |
| }(this, function (exports) { |
| 'use strict'; |
| |
| var Token, |
| TokenName, |
| FnExprTokens, |
| Syntax, |
| PlaceHolders, |
| Messages, |
| Regex, |
| source, |
| strict, |
| sourceType, |
| index, |
| lineNumber, |
| lineStart, |
| hasLineTerminator, |
| lastIndex, |
| lastLineNumber, |
| lastLineStart, |
| startIndex, |
| startLineNumber, |
| startLineStart, |
| scanning, |
| length, |
| lookahead, |
| state, |
| extra, |
| isBindingElement, |
| isAssignmentTarget, |
| firstCoverInitializedNameError; |
| |
| Token = { |
| BooleanLiteral: 1, |
| EOF: 2, |
| Identifier: 3, |
| Keyword: 4, |
| NullLiteral: 5, |
| NumericLiteral: 6, |
| Punctuator: 7, |
| StringLiteral: 8, |
| RegularExpression: 9, |
| Template: 10 |
| }; |
| |
| 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'; |
| TokenName[Token.RegularExpression] = 'RegularExpression'; |
| TokenName[Token.Template] = 'Template'; |
| |
| // A function following one of those tokens is an expression. |
| FnExprTokens = ['(', '{', '[', 'in', 'typeof', 'instanceof', 'new', |
| 'return', 'case', 'delete', 'throw', 'void', |
| // assignment operators |
| '=', '+=', '-=', '*=', '/=', '%=', '<<=', '>>=', '>>>=', |
| '&=', '|=', '^=', ',', |
| // binary/unary operators |
| '+', '-', '*', '/', '%', '++', '--', '<<', '>>', '>>>', '&', |
| '|', '^', '!', '~', '&&', '||', '?', ':', '===', '==', '>=', |
| '<=', '<', '>', '!=', '!==']; |
| |
| Syntax = { |
| AssignmentExpression: 'AssignmentExpression', |
| AssignmentPattern: 'AssignmentPattern', |
| ArrayExpression: 'ArrayExpression', |
| ArrayPattern: 'ArrayPattern', |
| ArrowFunctionExpression: 'ArrowFunctionExpression', |
| BlockStatement: 'BlockStatement', |
| BinaryExpression: 'BinaryExpression', |
| BreakStatement: 'BreakStatement', |
| CallExpression: 'CallExpression', |
| CatchClause: 'CatchClause', |
| ClassBody: 'ClassBody', |
| ClassDeclaration: 'ClassDeclaration', |
| ClassExpression: 'ClassExpression', |
| ConditionalExpression: 'ConditionalExpression', |
| ContinueStatement: 'ContinueStatement', |
| DoWhileStatement: 'DoWhileStatement', |
| DebuggerStatement: 'DebuggerStatement', |
| EmptyStatement: 'EmptyStatement', |
| ExportAllDeclaration: 'ExportAllDeclaration', |
| ExportDefaultDeclaration: 'ExportDefaultDeclaration', |
| ExportNamedDeclaration: 'ExportNamedDeclaration', |
| ExportSpecifier: 'ExportSpecifier', |
| ExpressionStatement: 'ExpressionStatement', |
| ForStatement: 'ForStatement', |
| ForOfStatement: 'ForOfStatement', |
| ForInStatement: 'ForInStatement', |
| FunctionDeclaration: 'FunctionDeclaration', |
| FunctionExpression: 'FunctionExpression', |
| Identifier: 'Identifier', |
| IfStatement: 'IfStatement', |
| ImportDeclaration: 'ImportDeclaration', |
| ImportDefaultSpecifier: 'ImportDefaultSpecifier', |
| ImportNamespaceSpecifier: 'ImportNamespaceSpecifier', |
| ImportSpecifier: 'ImportSpecifier', |
| Literal: 'Literal', |
| LabeledStatement: 'LabeledStatement', |
| LogicalExpression: 'LogicalExpression', |
| MemberExpression: 'MemberExpression', |
| MethodDefinition: 'MethodDefinition', |
| NewExpression: 'NewExpression', |
| ObjectExpression: 'ObjectExpression', |
| ObjectPattern: 'ObjectPattern', |
| Program: 'Program', |
| Property: 'Property', |
| RestElement: 'RestElement', |
| ReturnStatement: 'ReturnStatement', |
| SequenceExpression: 'SequenceExpression', |
| SpreadElement: 'SpreadElement', |
| Super: 'Super', |
| SwitchCase: 'SwitchCase', |
| SwitchStatement: 'SwitchStatement', |
| TaggedTemplateExpression: 'TaggedTemplateExpression', |
| TemplateElement: 'TemplateElement', |
| TemplateLiteral: 'TemplateLiteral', |
| ThisExpression: 'ThisExpression', |
| ThrowStatement: 'ThrowStatement', |
| TryStatement: 'TryStatement', |
| UnaryExpression: 'UnaryExpression', |
| UpdateExpression: 'UpdateExpression', |
| VariableDeclaration: 'VariableDeclaration', |
| VariableDeclarator: 'VariableDeclarator', |
| WhileStatement: 'WhileStatement', |
| WithStatement: 'WithStatement', |
| YieldExpression: 'YieldExpression' |
| }; |
| |
| PlaceHolders = { |
| ArrowParameterPlaceHolder: 'ArrowParameterPlaceHolder' |
| }; |
| |
| // 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', |
| UnexpectedTemplate: 'Unexpected quasi %0', |
| 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', |
| InvalidLHSInForLoop: 'Invalid left-hand side in for-loop', |
| MultipleDefaultsInSwitch: 'More than one default clause in switch statement', |
| 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', |
| IllegalYield: 'Unexpected token yield', |
| 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.', |
| 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', |
| TemplateOctalLiteral: 'Octal literals are not allowed in template strings.', |
| ParameterAfterRestParameter: 'Rest parameter must be last formal parameter', |
| DefaultRestParameter: 'Unexpected token =', |
| ObjectPatternAsRestParameter: 'Unexpected token {', |
| DuplicateProtoProperty: 'Duplicate __proto__ fields are not allowed in object literals', |
| ConstructorSpecialMethod: 'Class constructor may not be an accessor', |
| DuplicateConstructor: 'A class may only have one constructor', |
| StaticPrototype: 'Classes may not have static property named prototype', |
| MissingFromClause: 'Unexpected token', |
| NoAsAfterImportNamespace: 'Unexpected token', |
| InvalidModuleSpecifier: 'Unexpected token', |
| IllegalImportDeclaration: 'Unexpected token', |
| IllegalExportDeclaration: 'Unexpected token', |
| DuplicateBinding: 'Duplicate binding %0' |
| }; |
| |
| // 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\u037F\u0386\u0388-\u038A\u038C\u038E-\u03A1\u03A3-\u03F5\u03F7-\u0481\u048A-\u052F\u0531-\u0556\u0559\u0561-\u0587\u05D0-\u05EA\u05F0-\u05F2\u0620-\u064A\u066E\u066F\u0671-\u06D3\u06D5\u06E5\u06E6\u06EE\u06EF\u06FA-\u06FC\u06FF\u0710\u0712-\u072F\u074D-\u07A5\u07B1\u07CA-\u07EA\u07F4\u07F5\u07FA\u0800-\u0815\u081A\u0824\u0828\u0840-\u0858\u08A0-\u08B2\u0904-\u0939\u093D\u0950\u0958-\u0961\u0971-\u0980\u0985-\u098C\u098F\u0990\u0993-\u09A8\u09AA-\u09B0\u09B2\u09B6-\u09B9\u09BD\u09CE\u09DC\u09DD\u09DF-\u09E1\u09F0\u09F1\u0A05-\u0A0A\u0A0F\u0A10\u0A13-\u0A28\u0A2A-\u0A30\u0A32\u0A33\u0A35\u0A36\u0A38\u0A39\u0A59-\u0A5C\u0A5E\u0A72-\u0A74\u0A85-\u0A8D\u0A8F-\u0A91\u0A93-\u0AA8\u0AAA-\u0AB0\u0AB2\u0AB3\u0AB5-\u0AB9\u0ABD\u0AD0\u0AE0\u0AE1\u0B05-\u0B0C\u0B0F\u0B10\u0B13-\u0B28\u0B2A-\u0B30\u0B32\u0B33\u0B35-\u0B39\u0B3D\u0B5C\u0B5D\u0B5F-\u0B61\u0B71\u0B83\u0B85-\u0B8A\u0B8E-\u0B90\u0B92-\u0B95\u0B99\u0B9A\u0B9C\u0B9E\u0B9F\u0BA3\u0BA4\u0BA8-\u0BAA\u0BAE-\u0BB9\u0BD0\u0C05-\u0C0C\u0C0E-\u0C10\u0C12-\u0C28\u0C2A-\u0C39\u0C3D\u0C58\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-\u16F8\u1700-\u170C\u170E-\u1711\u1720-\u1731\u1740-\u1751\u1760-\u176C\u176E-\u1770\u1780-\u17B3\u17D7\u17DC\u1820-\u1877\u1880-\u18A8\u18AA\u18B0-\u18F5\u1900-\u191E\u1950-\u196D\u1970-\u1974\u1980-\u19AB\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-\uA69D\uA6A0-\uA6EF\uA717-\uA71F\uA722-\uA788\uA78B-\uA78E\uA790-\uA7AD\uA7B0\uA7B1\uA7F7-\uA801\uA803-\uA805\uA807-\uA80A\uA80C-\uA822\uA840-\uA873\uA882-\uA8B3\uA8F2-\uA8F7\uA8FB\uA90A-\uA925\uA930-\uA946\uA960-\uA97C\uA984-\uA9B2\uA9CF\uA9E0-\uA9E4\uA9E6-\uA9EF\uA9FA-\uA9FE\uAA00-\uAA28\uAA40-\uAA42\uAA44-\uAA4B\uAA60-\uAA76\uAA7A\uAA7E-\uAAAF\uAAB1\uAAB5\uAAB6\uAAB9-\uAABD\uAAC0\uAAC2\uAADB-\uAADD\uAAE0-\uAAEA\uAAF2-\uAAF4\uAB01-\uAB06\uAB09-\uAB0E\uAB11-\uAB16\uAB20-\uAB26\uAB28-\uAB2E\uAB30-\uAB5A\uAB5C-\uAB5F\uAB64\uAB65\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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\uFF5A\uFF66-\uFFBE\uFFC2-\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) { |
| /* istanbul ignore if */ |
| if (!condition) { |
| throw new Error('ASSERT: ' + message); |
| } |
| } |
| |
| function isDecimalDigit(ch) { |
| return (ch >= 0x30 && ch <= 0x39); // 0..9 |
| } |
| |
| function isHexDigit(ch) { |
| return '0123456789abcdefABCDEF'.indexOf(ch) >= 0; |
| } |
| |
| function isOctalDigit(ch) { |
| return '01234567'.indexOf(ch) >= 0; |
| } |
| |
| function octalToDecimal(ch) { |
| // \0 is not octal escape sequence |
| var octal = (ch !== '0'), code = '01234567'.indexOf(ch); |
| |
| if (index < length && isOctalDigit(source[index])) { |
| octal = true; |
| code = code * 8 + '01234567'.indexOf(source[index++]); |
| |
| // 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(source[index++]); |
| } |
| } |
| |
| return { |
| code: code, |
| octal: octal |
| }; |
| } |
| |
| // 7.2 White Space |
| |
| function isWhiteSpace(ch) { |
| return (ch === 0x20) || (ch === 0x09) || (ch === 0x0B) || (ch === 0x0C) || (ch === 0xA0) || |
| (ch >= 0x1680 && [0x1680, 0x180E, 0x2000, 0x2001, 0x2002, 0x2003, 0x2004, 0x2005, 0x2006, 0x2007, 0x2008, 0x2009, 0x200A, 0x202F, 0x205F, 0x3000, 0xFEFF].indexOf(ch) >= 0); |
| } |
| |
| // 7.3 Line Terminators |
| |
| function isLineTerminator(ch) { |
| return (ch === 0x0A) || (ch === 0x0D) || (ch === 0x2028) || (ch === 0x2029); |
| } |
| |
| // 7.6 Identifier Names and Identifiers |
| |
| function isIdentifierStart(ch) { |
| return (ch === 0x24) || (ch === 0x5F) || // $ (dollar) and _ (underscore) |
| (ch >= 0x41 && ch <= 0x5A) || // A..Z |
| (ch >= 0x61 && ch <= 0x7A) || // a..z |
| (ch === 0x5C) || // \ (backslash) |
| ((ch >= 0x80) && Regex.NonAsciiIdentifierStart.test(String.fromCharCode(ch))); |
| } |
| |
| function isIdentifierPart(ch) { |
| return (ch === 0x24) || (ch === 0x5F) || // $ (dollar) and _ (underscore) |
| (ch >= 0x41 && ch <= 0x5A) || // A..Z |
| (ch >= 0x61 && ch <= 0x7A) || // a..z |
| (ch >= 0x30 && ch <= 0x39) || // 0..9 |
| (ch === 0x5C) || // \ (backslash) |
| ((ch >= 0x80) && Regex.NonAsciiIdentifierPart.test(String.fromCharCode(ch))); |
| } |
| |
| // 7.6.1.2 Future Reserved Words |
| |
| function isFutureReservedWord(id) { |
| switch (id) { |
| case 'enum': |
| case 'export': |
| case 'import': |
| case 'super': |
| return true; |
| default: |
| return false; |
| } |
| } |
| |
| // 11.6.2.2 Future Reserved Words |
| |
| function isStrictModeReservedWord(id) { |
| switch (id) { |
| case 'implements': |
| case 'interface': |
| case 'package': |
| case 'private': |
| case 'protected': |
| case 'public': |
| case 'static': |
| case 'yield': |
| case 'let': |
| return true; |
| default: |
| return false; |
| } |
| } |
| |
| function isRestrictedWord(id) { |
| return id === 'eval' || id === 'arguments'; |
| } |
| |
| // 7.6.1.1 Keywords |
| |
| function isKeyword(id) { |
| |
| // 'const' is specialized as Keyword in V8. |
| // 'yield' and 'let' are for compatibility with SpiderMonkey and ES.next. |
| // Some others are from future reserved words. |
| |
| switch (id.length) { |
| case 2: |
| return (id === 'if') || (id === 'in') || (id === 'do'); |
| case 3: |
| return (id === 'var') || (id === 'for') || (id === 'new') || |
| (id === 'try') || (id === 'let'); |
| case 4: |
| return (id === 'this') || (id === 'else') || (id === 'case') || |
| (id === 'void') || (id === 'with') || (id === 'enum'); |
| case 5: |
| return (id === 'while') || (id === 'break') || (id === 'catch') || |
| (id === 'throw') || (id === 'const') || (id === 'yield') || |
| (id === 'class') || (id === 'super'); |
| case 6: |
| return (id === 'return') || (id === 'typeof') || (id === 'delete') || |
| (id === 'switch') || (id === 'export') || (id === 'import'); |
| case 7: |
| return (id === 'default') || (id === 'finally') || (id === 'extends'); |
| case 8: |
| return (id === 'function') || (id === 'continue') || (id === 'debugger'); |
| case 10: |
| return (id === 'instanceof'); |
| default: |
| return false; |
| } |
| } |
| |
| // 7.4 Comments |
| |
| function addComment(type, value, start, end, loc) { |
| var comment; |
| |
| assert(typeof start === 'number', 'Comment must have valid position'); |
| |
| state.lastCommentStart = start; |
| |
| comment = { |
| type: type, |
| value: value |
| }; |
| if (extra.range) { |
| comment.range = [start, end]; |
| } |
| if (extra.loc) { |
| comment.loc = loc; |
| } |
| extra.comments.push(comment); |
| if (extra.attachComment) { |
| extra.leadingComments.push(comment); |
| extra.trailingComments.push(comment); |
| } |
| } |
| |
| function skipSingleLineComment(offset) { |
| var start, loc, ch, comment; |
| |
| start = index - offset; |
| loc = { |
| start: { |
| line: lineNumber, |
| column: index - lineStart - offset |
| } |
| }; |
| |
| while (index < length) { |
| ch = source.charCodeAt(index); |
| ++index; |
| if (isLineTerminator(ch)) { |
| hasLineTerminator = true; |
| if (extra.comments) { |
| comment = source.slice(start + offset, index - 1); |
| loc.end = { |
| line: lineNumber, |
| column: index - lineStart - 1 |
| }; |
| addComment('Line', comment, start, index - 1, loc); |
| } |
| if (ch === 13 && source.charCodeAt(index) === 10) { |
| ++index; |
| } |
| ++lineNumber; |
| lineStart = index; |
| return; |
| } |
| } |
| |
| if (extra.comments) { |
| comment = source.slice(start + offset, index); |
| loc.end = { |
| line: lineNumber, |
| column: index - lineStart |
| }; |
| addComment('Line', comment, start, index, loc); |
| } |
| } |
| |
| function skipMultiLineComment() { |
| var start, loc, ch, comment; |
| |
| if (extra.comments) { |
| start = index - 2; |
| loc = { |
| start: { |
| line: lineNumber, |
| column: index - lineStart - 2 |
| } |
| }; |
| } |
| |
| while (index < length) { |
| ch = source.charCodeAt(index); |
| if (isLineTerminator(ch)) { |
| if (ch === 0x0D && source.charCodeAt(index + 1) === 0x0A) { |
| ++index; |
| } |
| hasLineTerminator = true; |
| ++lineNumber; |
| ++index; |
| lineStart = index; |
| } else if (ch === 0x2A) { |
| // Block comment ends with '*/'. |
| if (source.charCodeAt(index + 1) === 0x2F) { |
| ++index; |
| ++index; |
| if (extra.comments) { |
| comment = source.slice(start + 2, index - 2); |
| loc.end = { |
| line: lineNumber, |
| column: index - lineStart |
| }; |
| addComment('Block', comment, start, index, loc); |
| } |
| return; |
| } |
| ++index; |
| } else { |
| ++index; |
| } |
| } |
| |
| // Ran off the end of the file - the whole thing is a comment |
| if (extra.comments) { |
| loc.end = { |
| line: lineNumber, |
| column: index - lineStart |
| }; |
| comment = source.slice(start + 2, index); |
| addComment('Block', comment, start, index, loc); |
| } |
| tolerateUnexpectedToken(); |
| } |
| |
| function skipComment() { |
| var ch, start; |
| hasLineTerminator = false; |
| |
| start = (index === 0); |
| while (index < length) { |
| ch = source.charCodeAt(index); |
| |
| if (isWhiteSpace(ch)) { |
| ++index; |
| } else if (isLineTerminator(ch)) { |
| hasLineTerminator = true; |
| ++index; |
| if (ch === 0x0D && source.charCodeAt(index) === 0x0A) { |
| ++index; |
| } |
| ++lineNumber; |
| lineStart = index; |
| start = true; |
| } else if (ch === 0x2F) { // U+002F is '/' |
| ch = source.charCodeAt(index + 1); |
| if (ch === 0x2F) { |
| ++index; |
| ++index; |
| skipSingleLineComment(2); |
| start = true; |
| } else if (ch === 0x2A) { // U+002A is '*' |
| ++index; |
| ++index; |
| skipMultiLineComment(); |
| } else { |
| break; |
| } |
| } else if (start && ch === 0x2D) { // U+002D is '-' |
| // U+003E is '>' |
| if ((source.charCodeAt(index + 1) === 0x2D) && (source.charCodeAt(index + 2) === 0x3E)) { |
| // '-->' is a single-line comment |
| index += 3; |
| skipSingleLineComment(3); |
| } else { |
| break; |
| } |
| } else if (ch === 0x3C) { // U+003C is '<' |
| if (source.slice(index + 1, index + 4) === '!--') { |
| ++index; // `<` |
| ++index; // `!` |
| ++index; // `-` |
| ++index; // `-` |
| skipSingleLineComment(4); |
| } else { |
| break; |
| } |
| } else { |
| break; |
| } |
| } |
| } |
| |
| 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 = source[index++]; |
| code = code * 16 + '0123456789abcdef'.indexOf(ch.toLowerCase()); |
| } else { |
| return ''; |
| } |
| } |
| return String.fromCharCode(code); |
| } |
| |
| function scanUnicodeCodePointEscape() { |
| var ch, code, cu1, cu2; |
| |
| ch = source[index]; |
| code = 0; |
| |
| // At least, one hex digit is required. |
| if (ch === '}') { |
| throwUnexpectedToken(); |
| } |
| |
| while (index < length) { |
| ch = source[index++]; |
| if (!isHexDigit(ch)) { |
| break; |
| } |
| code = code * 16 + '0123456789abcdef'.indexOf(ch.toLowerCase()); |
| } |
| |
| if (code > 0x10FFFF || ch !== '}') { |
| throwUnexpectedToken(); |
| } |
| |
| // UTF-16 Encoding |
| if (code <= 0xFFFF) { |
| return String.fromCharCode(code); |
| } |
| cu1 = ((code - 0x10000) >> 10) + 0xD800; |
| cu2 = ((code - 0x10000) & 1023) + 0xDC00; |
| return String.fromCharCode(cu1, cu2); |
| } |
| |
| function getEscapedIdentifier() { |
| var ch, id; |
| |
| ch = source.charCodeAt(index++); |
| id = String.fromCharCode(ch); |
| |
| // '\u' (U+005C, U+0075) denotes an escaped character. |
| if (ch === 0x5C) { |
| if (source.charCodeAt(index) !== 0x75) { |
| throwUnexpectedToken(); |
| } |
| ++index; |
| ch = scanHexEscape('u'); |
| if (!ch || ch === '\\' || !isIdentifierStart(ch.charCodeAt(0))) { |
| throwUnexpectedToken(); |
| } |
| id = ch; |
| } |
| |
| while (index < length) { |
| ch = source.charCodeAt(index); |
| if (!isIdentifierPart(ch)) { |
| break; |
| } |
| ++index; |
| id += String.fromCharCode(ch); |
| |
| // '\u' (U+005C, U+0075) denotes an escaped character. |
| if (ch === 0x5C) { |
| id = id.substr(0, id.length - 1); |
| if (source.charCodeAt(index) !== 0x75) { |
| throwUnexpectedToken(); |
| } |
| ++index; |
| ch = scanHexEscape('u'); |
| if (!ch || ch === '\\' || !isIdentifierPart(ch.charCodeAt(0))) { |
| throwUnexpectedToken(); |
| } |
| id += ch; |
| } |
| } |
| |
| return id; |
| } |
| |
| function getIdentifier() { |
| var start, ch; |
| |
| start = index++; |
| while (index < length) { |
| ch = source.charCodeAt(index); |
| if (ch === 0x5C) { |
| // Blackslash (U+005C) marks Unicode escape sequence. |
| index = start; |
| return getEscapedIdentifier(); |
| } |
| if (isIdentifierPart(ch)) { |
| ++index; |
| } else { |
| break; |
| } |
| } |
| |
| return source.slice(start, index); |
| } |
| |
| function scanIdentifier() { |
| var start, id, type; |
| |
| start = index; |
| |
| // Backslash (U+005C) starts an escaped character. |
| id = (source.charCodeAt(index) === 0x5C) ? getEscapedIdentifier() : getIdentifier(); |
| |
| // There is no keyword or literal with only one character. |
| // Thus, it must be an identifier. |
| if (id.length === 1) { |
| type = Token.Identifier; |
| } else if (isKeyword(id)) { |
| type = Token.Keyword; |
| } else if (id === 'null') { |
| type = Token.NullLiteral; |
| } else if (id === 'true' || id === 'false') { |
| type = Token.BooleanLiteral; |
| } else { |
| type = Token.Identifier; |
| } |
| |
| return { |
| type: type, |
| value: id, |
| lineNumber: lineNumber, |
| lineStart: lineStart, |
| start: start, |
| end: index |
| }; |
| } |
| |
| |
| // 7.7 Punctuators |
| |
| function scanPunctuator() { |
| var token, str; |
| |
| token = { |
| type: Token.Punctuator, |
| value: '', |
| lineNumber: lineNumber, |
| lineStart: lineStart, |
| start: index, |
| end: index |
| }; |
| |
| // Check for most common single-character punctuators. |
| str = source[index]; |
| switch (str) { |
| |
| case '(': |
| if (extra.tokenize) { |
| extra.openParenToken = extra.tokens.length; |
| } |
| ++index; |
| break; |
| |
| case '{': |
| if (extra.tokenize) { |
| extra.openCurlyToken = extra.tokens.length; |
| } |
| state.curlyStack.push('{'); |
| ++index; |
| break; |
| |
| case '.': |
| ++index; |
| if (source[index] === '.' && source[index + 1] === '.') { |
| // Spread operator: ... |
| index += 2; |
| str = '...'; |
| } |
| break; |
| |
| case '}': |
| ++index; |
| state.curlyStack.pop(); |
| break; |
| case ')': |
| case ';': |
| case ',': |
| case '[': |
| case ']': |
| case ':': |
| case '?': |
| case '~': |
| ++index; |
| break; |
| |
| default: |
| // 4-character punctuator. |
| str = source.substr(index, 4); |
| if (str === '>>>=') { |
| index += 4; |
| } else { |
| |
| // 3-character punctuators. |
| str = str.substr(0, 3); |
| if (str === '===' || str === '!==' || str === '>>>' || |
| str === '<<=' || str === '>>=') { |
| index += 3; |
| } else { |
| |
| // 2-character punctuators. |
| str = str.substr(0, 2); |
| if (str === '&&' || str === '||' || str === '==' || str === '!=' || |
| str === '+=' || str === '-=' || str === '*=' || str === '/=' || |
| str === '++' || str === '--' || str === '<<' || str === '>>' || |
| str === '&=' || str === '|=' || str === '^=' || str === '%=' || |
| str === '<=' || str === '>=' || str === '=>') { |
| index += 2; |
| } else { |
| |
| // 1-character punctuators. |
| str = source[index]; |
| if ('<>=!+-*%&|^/'.indexOf(str) >= 0) { |
| ++index; |
| } |
| } |
| } |
| } |
| } |
| |
| if (index === token.start) { |
| throwUnexpectedToken(); |
| } |
| |
| token.end = index; |
| token.value = str; |
| return token; |
| } |
| |
| // 7.8.3 Numeric Literals |
| |
| function scanHexLiteral(start) { |
| var number = ''; |
| |
| while (index < length) { |
| if (!isHexDigit(source[index])) { |
| break; |
| } |
| number += source[index++]; |
| } |
| |
| if (number.length === 0) { |
| throwUnexpectedToken(); |
| } |
| |
| if (isIdentifierStart(source.charCodeAt(index))) { |
| throwUnexpectedToken(); |
| } |
| |
| return { |
| type: Token.NumericLiteral, |
| value: parseInt('0x' + number, 16), |
| lineNumber: lineNumber, |
| lineStart: lineStart, |
| start: start, |
| end: index |
| }; |
| } |
| |
| function scanBinaryLiteral(start) { |
| var ch, number; |
| |
| number = ''; |
| |
| while (index < length) { |
| ch = source[index]; |
| if (ch !== '0' && ch !== '1') { |
| break; |
| } |
| number += source[index++]; |
| } |
| |
| if (number.length === 0) { |
| // only 0b or 0B |
| throwUnexpectedToken(); |
| } |
| |
| if (index < length) { |
| ch = source.charCodeAt(index); |
| /* istanbul ignore else */ |
| if (isIdentifierStart(ch) || isDecimalDigit(ch)) { |
| throwUnexpectedToken(); |
| } |
| } |
| |
| return { |
| type: Token.NumericLiteral, |
| value: parseInt(number, 2), |
| lineNumber: lineNumber, |
| lineStart: lineStart, |
| start: start, |
| end: index |
| }; |
| } |
| |
| function scanOctalLiteral(prefix, start) { |
| var number, octal; |
| |
| if (isOctalDigit(prefix)) { |
| octal = true; |
| number = '0' + source[index++]; |
| } else { |
| octal = false; |
| ++index; |
| number = ''; |
| } |
| |
| while (index < length) { |
| if (!isOctalDigit(source[index])) { |
| break; |
| } |
| number += source[index++]; |
| } |
| |
| if (!octal && number.length === 0) { |
| // only 0o or 0O |
| throwUnexpectedToken(); |
| } |
| |
| if (isIdentifierStart(source.charCodeAt(index)) || isDecimalDigit(source.charCodeAt(index))) { |
| throwUnexpectedToken(); |
| } |
| |
| return { |
| type: Token.NumericLiteral, |
| value: parseInt(number, 8), |
| octal: octal, |
| lineNumber: lineNumber, |
| lineStart: lineStart, |
| start: start, |
| end: index |
| }; |
| } |
| |
| function isImplicitOctalLiteral() { |
| var i, ch; |
| |
| // Implicit octal, unless there is a non-octal digit. |
| // (Annex B.1.1 on Numeric Literals) |
| for (i = index + 1; i < length; ++i) { |
| ch = source[i]; |
| if (ch === '8' || ch === '9') { |
| return false; |
| } |
| if (!isOctalDigit(ch)) { |
| return true; |
| } |
| } |
| |
| return true; |
| } |
| |
| function scanNumericLiteral() { |
| var number, start, ch; |
| |
| ch = source[index]; |
| assert(isDecimalDigit(ch.charCodeAt(0)) || (ch === '.'), |
| 'Numeric literal must start with a decimal digit or a decimal point'); |
| |
| start = index; |
| number = ''; |
| if (ch !== '.') { |
| number = source[index++]; |
| ch = source[index]; |
| |
| // Hex number starts with '0x'. |
| // Octal number starts with '0'. |
| // Octal number in ES6 starts with '0o'. |
| // Binary number in ES6 starts with '0b'. |
| if (number === '0') { |
| if (ch === 'x' || ch === 'X') { |
| ++index; |
| return scanHexLiteral(start); |
| } |
| if (ch === 'b' || ch === 'B') { |
| ++index; |
| return scanBinaryLiteral(start); |
| } |
| if (ch === 'o' || ch === 'O') { |
| return scanOctalLiteral(ch, start); |
| } |
| |
| if (isOctalDigit(ch)) { |
| if (isImplicitOctalLiteral()) { |
| return scanOctalLiteral(ch, start); |
| } |
| } |
| } |
| |
| while (isDecimalDigit(source.charCodeAt(index))) { |
| number += source[index++]; |
| } |
| ch = source[index]; |
| } |
| |
| if (ch === '.') { |
| number += source[index++]; |
| while (isDecimalDigit(source.charCodeAt(index))) { |
| number += source[index++]; |
| } |
| ch = source[index]; |
| } |
| |
| if (ch === 'e' || ch === 'E') { |
| number += source[index++]; |
| |
| ch = source[index]; |
| if (ch === '+' || ch === '-') { |
| number += source[index++]; |
| } |
| if (isDecimalDigit(source.charCodeAt(index))) { |
| while (isDecimalDigit(source.charCodeAt(index))) { |
| number += source[index++]; |
| } |
| } else { |
| throwUnexpectedToken(); |
| } |
| } |
| |
| if (isIdentifierStart(source.charCodeAt(index))) { |
| throwUnexpectedToken(); |
| } |
| |
| return { |
| type: Token.NumericLiteral, |
| value: parseFloat(number), |
| lineNumber: lineNumber, |
| lineStart: lineStart, |
| start: start, |
| end: index |
| }; |
| } |
| |
| // 7.8.4 String Literals |
| |
| function scanStringLiteral() { |
| var str = '', quote, start, ch, unescaped, octToDec, octal = false; |
| |
| quote = source[index]; |
| assert((quote === '\'' || quote === '"'), |
| 'String literal must starts with a quote'); |
| |
| start = index; |
| ++index; |
| |
| while (index < length) { |
| ch = source[index++]; |
| |
| if (ch === quote) { |
| quote = ''; |
| break; |
| } else if (ch === '\\') { |
| ch = source[index++]; |
| if (!ch || !isLineTerminator(ch.charCodeAt(0))) { |
| switch (ch) { |
| case 'u': |
| case 'x': |
| if (source[index] === '{') { |
| ++index; |
| str += scanUnicodeCodePointEscape(); |
| } else { |
| unescaped = scanHexEscape(ch); |
| if (!unescaped) { |
| throw throwUnexpectedToken(); |
| } |
| str += unescaped; |
| } |
| break; |
| case 'n': |
| str += '\n'; |
| break; |
| case 'r': |
| str += '\r'; |
| break; |
| case 't': |
| str += '\t'; |
| break; |
| case 'b': |
| str += '\b'; |
| break; |
| case 'f': |
| str += '\f'; |
| break; |
| case 'v': |
| str += '\x0B'; |
| break; |
| case '8': |
| case '9': |
| throw throwUnexpectedToken(); |
| |
| default: |
| if (isOctalDigit(ch)) { |
| octToDec = octalToDecimal(ch); |
| |
| octal = octToDec.octal || octal; |
| str += String.fromCharCode(octToDec.code); |
| } else { |
| str += ch; |
| } |
| break; |
| } |
| } else { |
| ++lineNumber; |
| if (ch === '\r' && source[index] === '\n') { |
| ++index; |
| } |
| lineStart = index; |
| } |
| } else if (isLineTerminator(ch.charCodeAt(0))) { |
| break; |
| } else { |
| str += ch; |
| } |
| } |
| |
| if (quote !== '') { |
| throwUnexpectedToken(); |
| } |
| |
| return { |
| type: Token.StringLiteral, |
| value: str, |
| octal: octal, |
| lineNumber: startLineNumber, |
| lineStart: startLineStart, |
| start: start, |
| end: index |
| }; |
| } |
| |
| function scanTemplate() { |
| var cooked = '', ch, start, rawOffset, terminated, head, tail, restore, unescaped; |
| |
| terminated = false; |
| tail = false; |
| start = index; |
| head = (source[index] === '`'); |
| rawOffset = 2; |
| |
| ++index; |
| |
| while (index < length) { |
| ch = source[index++]; |
| if (ch === '`') { |
| rawOffset = 1; |
| tail = true; |
| terminated = true; |
| break; |
| } else if (ch === '$') { |
| if (source[index] === '{') { |
| state.curlyStack.push('${'); |
| ++index; |
| terminated = true; |
| break; |
| } |
| cooked += ch; |
| } else if (ch === '\\') { |
| ch = source[index++]; |
| if (!isLineTerminator(ch.charCodeAt(0))) { |
| switch (ch) { |
| case 'n': |
| cooked += '\n'; |
| break; |
| case 'r': |
| cooked += '\r'; |
| break; |
| case 't': |
| cooked += '\t'; |
| break; |
| case 'u': |
| case 'x': |
| if (source[index] === '{') { |
| ++index; |
| cooked += scanUnicodeCodePointEscape(); |
| } else { |
| restore = index; |
| unescaped = scanHexEscape(ch); |
| if (unescaped) { |
| cooked += unescaped; |
| } else { |
| index = restore; |
| cooked += ch; |
| } |
| } |
| break; |
| case 'b': |
| cooked += '\b'; |
| break; |
| case 'f': |
| cooked += '\f'; |
| break; |
| case 'v': |
| cooked += '\v'; |
| break; |
| |
| default: |
| if (ch === '0') { |
| if (isDecimalDigit(source.charCodeAt(index))) { |
| // Illegal: \01 \02 and so on |
| throwError(Messages.TemplateOctalLiteral); |
| } |
| cooked += '\0'; |
| } else if (isOctalDigit(ch)) { |
| // Illegal: \1 \2 |
| throwError(Messages.TemplateOctalLiteral); |
| } else { |
| cooked += ch; |
| } |
| break; |
| } |
| } else { |
| ++lineNumber; |
| if (ch === '\r' && source[index] === '\n') { |
| ++index; |
| } |
| lineStart = index; |
| } |
| } else if (isLineTerminator(ch.charCodeAt(0))) { |
| ++lineNumber; |
| if (ch === '\r' && source[index] === '\n') { |
| ++index; |
| } |
| lineStart = index; |
| cooked += '\n'; |
| } else { |
| cooked += ch; |
| } |
| } |
| |
| if (!terminated) { |
| throwUnexpectedToken(); |
| } |
| |
| if (!head) { |
| state.curlyStack.pop(); |
| } |
| |
| return { |
| type: Token.Template, |
| value: { |
| cooked: cooked, |
| raw: source.slice(start + 1, index - rawOffset) |
| }, |
| head: head, |
| tail: tail, |
| lineNumber: lineNumber, |
| lineStart: lineStart, |
| start: start, |
| end: index |
| }; |
| } |
| |
| function testRegExp(pattern, flags) { |
| // The BMP character to use as a replacement for astral symbols when |
| // translating an ES6 "u"-flagged pattern to an ES5-compatible |
| // approximation. |
| // Note: replacing with '\uFFFF' enables false positives in unlikely |
| // scenarios. For example, `[\u{1044f}-\u{10440}]` is an invalid |
| // pattern that would not be detected by this substitution. |
| var astralSubstitute = '\uFFFF', |
| tmp = pattern; |
| |
| if (flags.indexOf('u') >= 0) { |
| tmp = tmp |
| // Replace every Unicode escape sequence with the equivalent |
| // BMP character or a constant ASCII code point in the case of |
| // astral symbols. (See the above note on `astralSubstitute` |
| // for more information.) |
| .replace(/\\u\{([0-9a-fA-F]+)\}|\\u([a-fA-F0-9]{4})/g, function ($0, $1, $2) { |
| var codePoint = parseInt($1 || $2, 16); |
| if (codePoint > 0x10FFFF) { |
| throwUnexpectedToken(null, Messages.InvalidRegExp); |
| } |
| if (codePoint <= 0xFFFF) { |
| return String.fromCharCode(codePoint); |
| } |
| return astralSubstitute; |
| }) |
| // Replace each paired surrogate with a single ASCII symbol to |
| // avoid throwing on regular expressions that are only valid in |
| // combination with the "u" flag. |
| .replace( |
| /[\uD800-\uDBFF][\uDC00-\uDFFF]/g, |
| astralSubstitute |
| ); |
| } |
| |
| // First, detect invalid regular expressions. |
| try { |
| RegExp(tmp); |
| } catch (e) { |
| throwUnexpectedToken(null, Messages.InvalidRegExp); |
| } |
| |
| // Return a regular expression object for this pattern-flag pair, or |
| // `null` in case the current environment doesn't support the flags it |
| // uses. |
| try { |
| return new RegExp(pattern, flags); |
| } catch (exception) { |
| return null; |
| } |
| } |
| |
| function scanRegExpBody() { |
| var ch, str, classMarker, terminated, body; |
| |
| ch = source[index]; |
| assert(ch === '/', 'Regular expression literal must start with a slash'); |
| str = source[index++]; |
| |
| classMarker = false; |
| terminated = false; |
| while (index < length) { |
| ch = source[index++]; |
| str += ch; |
| if (ch === '\\') { |
| ch = source[index++]; |
| // ECMA-262 7.8.5 |
| if (isLineTerminator(ch.charCodeAt(0))) { |
| throwUnexpectedToken(null, Messages.UnterminatedRegExp); |
| } |
| str += ch; |
| } else if (isLineTerminator(ch.charCodeAt(0))) { |
| throwUnexpectedToken(null, Messages.UnterminatedRegExp); |
| } else if (classMarker) { |
| if (ch === ']') { |
| classMarker = false; |
| } |
| } else { |
| if (ch === '/') { |
| terminated = true; |
| break; |
| } else if (ch === '[') { |
| classMarker = true; |
| } |
| } |
| } |
| |
| if (!terminated) { |
| throwUnexpectedToken(null, Messages.UnterminatedRegExp); |
| } |
| |
| // Exclude leading and trailing slash. |
| body = str.substr(1, str.length - 2); |
| return { |
| value: body, |
| literal: str |
| }; |
| } |
| |
| function scanRegExpFlags() { |
| var ch, str, flags, restore; |
| |
| str = ''; |
| flags = ''; |
| while (index < length) { |
| ch = source[index]; |
| if (!isIdentifierPart(ch.charCodeAt(0))) { |
| break; |
| } |
| |
| ++index; |
| if (ch === '\\' && index < length) { |
| ch = source[index]; |
| if (ch === 'u') { |
| ++index; |
| restore = index; |
| ch = scanHexEscape('u'); |
| if (ch) { |
| flags += ch; |
| for (str += '\\u'; restore < index; ++restore) { |
| str += source[restore]; |
| } |
| } else { |
| index = restore; |
| flags += 'u'; |
| str += '\\u'; |
| } |
| tolerateUnexpectedToken(); |
| } else { |
| str += '\\'; |
| tolerateUnexpectedToken(); |
| } |
| } else { |
| flags += ch; |
| str += ch; |
| } |
| } |
| |
| return { |
| value: flags, |
| literal: str |
| }; |
| } |
| |
| function scanRegExp() { |
| scanning = true; |
| var start, body, flags, value; |
| |
| lookahead = null; |
| skipComment(); |
| start = index; |
| |
| body = scanRegExpBody(); |
| flags = scanRegExpFlags(); |
| value = testRegExp(body.value, flags.value); |
| scanning = false; |
| if (extra.tokenize) { |
| return { |
| type: Token.RegularExpression, |
| value: value, |
| regex: { |
| pattern: body.value, |
| flags: flags.value |
| }, |
| lineNumber: lineNumber, |
| lineStart: lineStart, |
| start: start, |
| end: index |
| }; |
| } |
| |
| return { |
| literal: body.literal + flags.literal, |
| value: value, |
| regex: { |
| pattern: body.value, |
| flags: flags.value |
| }, |
| start: start, |
| end: index |
| }; |
| } |
| |
| function collectRegex() { |
| var pos, loc, regex, token; |
| |
| skipComment(); |
| |
| pos = index; |
| loc = { |
| start: { |
| line: lineNumber, |
| column: index - lineStart |
| } |
| }; |
| |
| regex = scanRegExp(); |
| |
| loc.end = { |
| line: lineNumber, |
| column: index - lineStart |
| }; |
| |
| /* istanbul ignore next */ |
| if (!extra.tokenize) { |
| // 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, |
| regex: regex.regex, |
| range: [pos, index], |
| loc: loc |
| }); |
| } |
| |
| return regex; |
| } |
| |
| function isIdentifierName(token) { |
| return token.type === Token.Identifier || |
| token.type === Token.Keyword || |
| token.type === Token.BooleanLiteral || |
| token.type === Token.NullLiteral; |
| } |
| |
| function advanceSlash() { |
| var prevToken, |
| checkToken; |
| // Using the following algorithm: |
| // https://github.com/mozilla/sweet.js/wiki/design |
| prevToken = extra.tokens[extra.tokens.length - 1]; |
| if (!prevToken) { |
| // Nothing before that: it cannot be a division. |
| return collectRegex(); |
| } |
| if (prevToken.type === 'Punctuator') { |
| if (prevToken.value === ']') { |
| return scanPunctuator(); |
| } |
| if (prevToken.value === ')') { |
| checkToken = extra.tokens[extra.openParenToken - 1]; |
| if (checkToken && |
| checkToken.type === 'Keyword' && |
| (checkToken.value === 'if' || |
| checkToken.value === 'while' || |
| checkToken.value === 'for' || |
| checkToken.value === 'with')) { |
| return collectRegex(); |
| } |
| return scanPunctuator(); |
| } |
| if (prevToken.value === '}') { |
| // Dividing a function by anything makes little sense, |
| // but we have to check for that. |
| if (extra.tokens[extra.openCurlyToken - 3] && |
| extra.tokens[extra.openCurlyToken - 3].type === 'Keyword') { |
| // Anonymous function. |
| checkToken = extra.tokens[extra.openCurlyToken - 4]; |
| if (!checkToken) { |
| return scanPunctuator(); |
| } |
| } else if (extra.tokens[extra.openCurlyToken - 4] && |
| extra.tokens[extra.openCurlyToken - 4].type === 'Keyword') { |
| // Named function. |
| checkToken = extra.tokens[extra.openCurlyToken - 5]; |
| if (!checkToken) { |
| return collectRegex(); |
| } |
| } else { |
| return scanPunctuator(); |
| } |
| // checkToken determines whether the function is |
| // a declaration or an expression. |
| if (FnExprTokens.indexOf(checkToken.value) >= 0) { |
| // It is an expression. |
| return scanPunctuator(); |
| } |
| // It is a declaration. |
| return collectRegex(); |
| } |
| return collectRegex(); |
| } |
| if (prevToken.type === 'Keyword' && prevToken.value !== 'this') { |
| return collectRegex(); |
| } |
| return scanPunctuator(); |
| } |
| |
| function advance() { |
| var ch, token; |
| |
| if (index >= length) { |
| return { |
| type: Token.EOF, |
| lineNumber: lineNumber, |
| lineStart: lineStart, |
| start: index, |
| end: index |
| }; |
| } |
| |
| ch = source.charCodeAt(index); |
| |
| if (isIdentifierStart(ch)) { |
| token = scanIdentifier(); |
| if (strict && isStrictModeReservedWord(token.value)) { |
| token.type = Token.Keyword; |
| } |
| return token; |
| } |
| |
| // Very common: ( and ) and ; |
| if (ch === 0x28 || ch === 0x29 || ch === 0x3B) { |
| return scanPunctuator(); |
| } |
| |
| // String literal starts with single quote (U+0027) or double quote (U+0022). |
| if (ch === 0x27 || ch === 0x22) { |
| return scanStringLiteral(); |
| } |
| |
| // Dot (.) U+002E can also start a floating-point number, hence the need |
| // to check the next character. |
| if (ch === 0x2E) { |
| if (isDecimalDigit(source.charCodeAt(index + 1))) { |
| return scanNumericLiteral(); |
| } |
| return scanPunctuator(); |
| } |
| |
| if (isDecimalDigit(ch)) { |
| return scanNumericLiteral(); |
| } |
| |
| // Slash (/) U+002F can also start a regex. |
| if (extra.tokenize && ch === 0x2F) { |
| return advanceSlash(); |
| } |
| |
| // Template literals start with ` (U+0060) for template head |
| // or } (U+007D) for template middle or template tail. |
| if (ch === 0x60 || (ch === 0x7D && state.curlyStack[state.curlyStack.length - 1] === '${')) { |
| return scanTemplate(); |
| } |
| |
| return scanPunctuator(); |
| } |
| |
| function collectToken() { |
| var loc, token, value, entry; |
| |
| loc = { |
| start: { |
| line: lineNumber, |
| column: index - lineStart |
| } |
| }; |
| |
| token = advance(); |
| loc.end = { |
| line: lineNumber, |
| column: index - lineStart |
| }; |
| |
| if (token.type !== Token.EOF) { |
| value = source.slice(token.start, token.end); |
| entry = { |
| type: TokenName[token.type], |
| value: value, |
| range: [token.start, token.end], |
| loc: loc |
| }; |
| if (token.regex) { |
| entry.regex = { |
| pattern: token.regex.pattern, |
| flags: token.regex.flags |
| }; |
| } |
| extra.tokens.push(entry); |
| } |
| |
| return token; |
| } |
| |
| function lex() { |
| var token; |
| scanning = true; |
| |
| lastIndex = index; |
| lastLineNumber = lineNumber; |
| lastLineStart = lineStart; |
| |
| skipComment(); |
| |
| token = lookahead; |
| |
| startIndex = index; |
| startLineNumber = lineNumber; |
| startLineStart = lineStart; |
| |
| lookahead = (typeof extra.tokens !== 'undefined') ? collectToken() : advance(); |
| scanning = false; |
| return token; |
| } |
| |
| function peek() { |
| scanning = true; |
| |
| skipComment(); |
| |
| lastIndex = index; |
| lastLineNumber = lineNumber; |
| lastLineStart = lineStart; |
| |
| startIndex = index; |
| startLineNumber = lineNumber; |
| startLineStart = lineStart; |
| |
| lookahead = (typeof extra.tokens !== 'undefined') ? collectToken() : advance(); |
| scanning = false; |
| } |
| |
| function Position() { |
| this.line = startLineNumber; |
| this.column = startIndex - startLineStart; |
| } |
| |
| function SourceLocation() { |
| this.start = new Position(); |
| this.end = null; |
| } |
| |
| function WrappingSourceLocation(startToken) { |
| this.start = { |
| line: startToken.lineNumber, |
| column: startToken.start - startToken.lineStart |
| }; |
| this.end = null; |
| } |
| |
| function Node() { |
| if (extra.range) { |
| this.range = [startIndex, 0]; |
| } |
| if (extra.loc) { |
| this.loc = new SourceLocation(); |
| } |
| } |
| |
| function WrappingNode(startToken) { |
| if (extra.range) { |
| this.range = [startToken.start, 0]; |
| } |
| if (extra.loc) { |
| this.loc = new WrappingSourceLocation(startToken); |
| } |
| } |
| |
| WrappingNode.prototype = Node.prototype = { |
| |
| processComment: function () { |
| var lastChild, |
| leadingComments, |
| trailingComments, |
| bottomRight = extra.bottomRightStack, |
| i, |
| comment, |
| last = bottomRight[bottomRight.length - 1]; |
| |
| if (this.type === Syntax.Program) { |
| if (this.body.length > 0) { |
| return; |
| } |
| } |
| |
| if (extra.trailingComments.length > 0) { |
| trailingComments = []; |
| for (i = extra.trailingComments.length - 1; i >= 0; --i) { |
| comment = extra.trailingComments[i]; |
| if (comment.range[0] >= this.range[1]) { |
| trailingComments.unshift(comment); |
| extra.trailingComments.splice(i, 1); |
| } |
| } |
| extra.trailingComments = []; |
| } else { |
| if (last && last.trailingComments && last.trailingComments[0].range[0] >= this.range[1]) { |
| trailingComments = last.trailingComments; |
| delete last.trailingComments; |
| } |
| } |
| |
| // Eating the stack. |
| while (last && last.range[0] >= this.range[0]) { |
| lastChild = bottomRight.pop(); |
| last = bottomRight[bottomRight.length - 1]; |
| } |
| |
| if (lastChild) { |
| if (lastChild.leadingComments) { |
| leadingComments = []; |
| for (i = lastChild.leadingComments.length - 1; i >= 0; --i) { |
| comment = lastChild.leadingComments[i]; |
| if (comment.range[1] <= this.range[0]) { |
| leadingComments.unshift(comment); |
| lastChild.leadingComments.splice(i, 1); |
| } |
| } |
| |
| if (!lastChild.leadingComments.length) { |
| lastChild.leadingComments = undefined; |
| } |
| } |
| } else if (extra.leadingComments.length > 0) { |
| leadingComments = []; |
| for (i = extra.leadingComments.length - 1; i >= 0; --i) { |
| comment = extra.leadingComments[i]; |
| if (comment.range[1] <= this.range[0]) { |
| leadingComments.unshift(comment); |
| extra.leadingComments.splice(i, 1); |
| } |
| } |
| } |
| |
| |
| if (leadingComments && leadingComments.length > 0) { |
| this.leadingComments = leadingComments; |
| } |
| if (trailingComments && trailingComments.length > 0) { |
| this.trailingComments = trailingComments; |
| } |
| |
| bottomRight.push(this); |
| }, |
| |
| finish: function () { |
| if (extra.range) { |
| this.range[1] = lastIndex; |
| } |
| if (extra.loc) { |
| this.loc.end = { |
| line: lastLineNumber, |
| column: lastIndex - lastLineStart |
| }; |
| if (extra.source) { |
| this.loc.source = extra.source; |
| } |
| } |
| |
| if (extra.attachComment) { |
| this.processComment(); |
| } |
| }, |
| |
| finishArrayExpression: function (elements) { |
| this.type = Syntax.ArrayExpression; |
| this.elements = elements; |
| this.finish(); |
| return this; |
| }, |
| |
| finishArrayPattern: function (elements) { |
| this.type = Syntax.ArrayPattern; |
| this.elements = elements; |
| this.finish(); |
| return this; |
| }, |
| |
| finishArrowFunctionExpression: function (params, defaults, body, expression) { |
| this.type = Syntax.ArrowFunctionExpression; |
| this.id = null; |
| this.params = params; |
| this.defaults = defaults; |
| this.body = body; |
| this.generator = false; |
| this.expression = expression; |
| this.finish(); |
| return this; |
| }, |
| |
| finishAssignmentExpression: function (operator, left, right) { |
| this.type = Syntax.AssignmentExpression; |
| this.operator = operator; |
| this.left = left; |
| this.right = right; |
| this.finish(); |
| return this; |
| }, |
| |
| finishAssignmentPattern: function (left, right) { |
| this.type = Syntax.AssignmentPattern; |
| this.left = left; |
| this.right = right; |
| this.finish(); |
| return this; |
| }, |
| |
| finishBinaryExpression: function (operator, left, right) { |
| this.type = (operator === '||' || operator === '&&') ? Syntax.LogicalExpression : Syntax.BinaryExpression; |
| this.operator = operator; |
| this.left = left; |
| this.right = right; |
| this.finish(); |
| return this; |
| }, |
| |
| finishBlockStatement: function (body) { |
| this.type = Syntax.BlockStatement; |
| this.body = body; |
| this.finish(); |
| return this; |
| }, |
| |
| finishBreakStatement: function (label) { |
| this.type = Syntax.BreakStatement; |
| this.label = label; |
| this.finish(); |
| return this; |
| }, |
| |
| finishCallExpression: function (callee, args) { |
| this.type = Syntax.CallExpression; |
| this.callee = callee; |
| this.arguments = args; |
| this.finish(); |
| return this; |
| }, |
| |
| finishCatchClause: function (param, body) { |
| this.type = Syntax.CatchClause; |
| this.param = param; |
| this.body = body; |
| this.finish(); |
| return this; |
| }, |
| |
| finishClassBody: function (body) { |
| this.type = Syntax.ClassBody; |
| this.body = body; |
| this.finish(); |
| return this; |
| }, |
| |
| finishClassDeclaration: function (id, superClass, body) { |
| this.type = Syntax.ClassDeclaration; |
| this.id = id; |
| this.superClass = superClass; |
| this.body = body; |
| this.finish(); |
| return this; |
| }, |
| |
| finishClassExpression: function (id, superClass, body) { |
| this.type = Syntax.ClassExpression; |
| this.id = id; |
| this.superClass = superClass; |
| this.body = body; |
| this.finish(); |
| return this; |
| }, |
| |
| finishConditionalExpression: function (test, consequent, alternate) { |
| this.type = Syntax.ConditionalExpression; |
| this.test = test; |
| this.consequent = consequent; |
| this.alternate = alternate; |
| this.finish(); |
| return this; |
| }, |
| |
| finishContinueStatement: function (label) { |
| this.type = Syntax.ContinueStatement; |
| this.label = label; |
| this.finish(); |
| return this; |
| }, |
| |
| finishDebuggerStatement: function () { |
| this.type = Syntax.DebuggerStatement; |
| this.finish(); |
| return this; |
| }, |
| |
| finishDoWhileStatement: function (body, test) { |
| this.type = Syntax.DoWhileStatement; |
| this.body = body; |
| this.test = test; |
| this.finish(); |
| return this; |
| }, |
| |
| finishEmptyStatement: function () { |
| this.type = Syntax.EmptyStatement; |
| this.finish(); |
| return this; |
| }, |
| |
| finishExpressionStatement: function (expression) { |
| this.type = Syntax.ExpressionStatement; |
| this.expression = expression; |
| this.finish(); |
| return this; |
| }, |
| |
| finishForStatement: function (init, test, update, body) { |
| this.type = Syntax.ForStatement; |
| this.init = init; |
| this.test = test; |
| this.update = update; |
| this.body = body; |
| this.finish(); |
| return this; |
| }, |
| |
| finishForOfStatement: function (left, right, body) { |
| this.type = Syntax.ForOfStatement; |
| this.left = left; |
| this.right = right; |
| this.body = body; |
| this.finish(); |
| return this; |
| }, |
| |
| finishForInStatement: function (left, right, body) { |
| this.type = Syntax.ForInStatement; |
| this.left = left; |
| this.right = right; |
| this.body = body; |
| this.each = false; |
| this.finish(); |
| return this; |
| }, |
| |
| finishFunctionDeclaration: function (id, params, defaults, body, generator) { |
| this.type = Syntax.FunctionDeclaration; |
| this.id = id; |
| this.params = params; |
| this.defaults = defaults; |
| this.body = body; |
| this.generator = generator; |
| this.expression = false; |
| this.finish(); |
| return this; |
| }, |
| |
| finishFunctionExpression: function (id, params, defaults, body, generator) { |
| this.type = Syntax.FunctionExpression; |
| this.id = id; |
| this.params = params; |
| this.defaults = defaults; |
| this.body = body; |
| this.generator = generator; |
| this.expression = false; |
| this.finish(); |
| return this; |
| }, |
| |
| finishIdentifier: function (name) { |
| this.type = Syntax.Identifier; |
| this.name = name; |
| this.finish(); |
| return this; |
| }, |
| |
| finishIfStatement: function (test, consequent, alternate) { |
| this.type = Syntax.IfStatement; |
| this.test = test; |
| this.consequent = consequent; |
| this.alternate = alternate; |
| this.finish(); |
| return this; |
| }, |
| |
| finishLabeledStatement: function (label, body) { |
| this.type = Syntax.LabeledStatement; |
| this.label = label; |
| this.body = body; |
| this.finish(); |
| return this; |
| }, |
| |
| finishLiteral: function (token) { |
| this.type = Syntax.Literal; |
| this.value = token.value; |
| this.raw = source.slice(token.start, token.end); |
| if (token.regex) { |
| this.regex = token.regex; |
| } |
| this.finish(); |
| return this; |
| }, |
| |
| finishMemberExpression: function (accessor, object, property) { |
| this.type = Syntax.MemberExpression; |
| this.computed = accessor === '['; |
| this.object = object; |
| this.property = property; |
| this.finish(); |
| return this; |
| }, |
| |
| finishNewExpression: function (callee, args) { |
| this.type = Syntax.NewExpression; |
| this.callee = callee; |
| this.arguments = args; |
| this.finish(); |
| return this; |
| }, |
| |
| finishObjectExpression: function (properties) { |
| this.type = Syntax.ObjectExpression; |
| this.properties = properties; |
| this.finish(); |
| return this; |
| }, |
| |
| finishObjectPattern: function (properties) { |
| this.type = Syntax.ObjectPattern; |
| this.properties = properties; |
| this.finish(); |
| return this; |
| }, |
| |
| finishPostfixExpression: function (operator, argument) { |
| this.type = Syntax.UpdateExpression; |
| this.operator = operator; |
| this.argument = argument; |
| this.prefix = false; |
| this.finish(); |
| return this; |
| }, |
| |
| finishProgram: function (body) { |
| this.type = Syntax.Program; |
| this.body = body; |
| if (sourceType === 'module') { |
| // very restrictive for now |
| this.sourceType = sourceType; |
| } |
| this.finish(); |
| return this; |
| }, |
| |
| finishProperty: function (kind, key, computed, value, method, shorthand) { |
| this.type = Syntax.Property; |
| this.key = key; |
| this.computed = computed; |
| this.value = value; |
| this.kind = kind; |
| this.method = method; |
| this.shorthand = shorthand; |
| this.finish(); |
| return this; |
| }, |
| |
| finishRestElement: function (argument) { |
| this.type = Syntax.RestElement; |
| this.argument = argument; |
| this.finish(); |
| return this; |
| }, |
| |
| finishReturnStatement: function (argument) { |
| this.type = Syntax.ReturnStatement; |
| this.argument = argument; |
| this.finish(); |
| return this; |
| }, |
| |
| finishSequenceExpression: function (expressions) { |
| this.type = Syntax.SequenceExpression; |
| this.expressions = expressions; |
| this.finish(); |
| return this; |
| }, |
| |
| finishSpreadElement: function (argument) { |
| this.type = Syntax.SpreadElement; |
| this.argument = argument; |
| this.finish(); |
| return this; |
| }, |
| |
| finishSwitchCase: function (test, consequent) { |
| this.type = Syntax.SwitchCase; |
| this.test = test; |
| this.consequent = consequent; |
| this.finish(); |
| return this; |
| }, |
| |
| finishSuper: function () { |
| this.type = Syntax.Super; |
| this.finish(); |
| return this; |
| }, |
| |
| finishSwitchStatement: function (discriminant, cases) { |
| this.type = Syntax.SwitchStatement; |
| this.discriminant = discriminant; |
| this.cases = cases; |
| this.finish(); |
| return this; |
| }, |
| |
| finishTaggedTemplateExpression: function (tag, quasi) { |
| this.type = Syntax.TaggedTemplateExpression; |
| this.tag = tag; |
| this.quasi = quasi; |
| this.finish(); |
| return this; |
| }, |
| |
| finishTemplateElement: function (value, tail) { |
| this.type = Syntax.TemplateElement; |
| this.value = value; |
| this.tail = tail; |
| this.finish(); |
| return this; |
| }, |
| |
| finishTemplateLiteral: function (quasis, expressions) { |
| this.type = Syntax.TemplateLiteral; |
| this.quasis = quasis; |
| this.expressions = expressions; |
| this.finish(); |
| return this; |
| }, |
| |
| finishThisExpression: function () { |
| this.type = Syntax.ThisExpression; |
| this.finish(); |
| return this; |
| }, |
| |
| finishThrowStatement: function (argument) { |
| this.type = Syntax.ThrowStatement; |
| this.argument = argument; |
| this.finish(); |
| return this; |
| }, |
| |
| finishTryStatement: function (block, handler, finalizer) { |
| this.type = Syntax.TryStatement; |
| this.block = block; |
| this.guardedHandlers = []; |
| this.handlers = handler ? [ handler ] : []; |
| this.handler = handler; |
| this.finalizer = finalizer; |
| this.finish(); |
| return this; |
| }, |
| |
| finishUnaryExpression: function (operator, argument) { |
| this.type = (operator === '++' || operator === '--') ? Syntax.UpdateExpression : Syntax.UnaryExpression; |
| this.operator = operator; |
| this.argument = argument; |
| this.prefix = true; |
| this.finish(); |
| return this; |
| }, |
| |
| finishVariableDeclaration: function (declarations) { |
| this.type = Syntax.VariableDeclaration; |
| this.declarations = declarations; |
| this.kind = 'var'; |
| this.finish(); |
| return this; |
| }, |
| |
| finishLexicalDeclaration: function (declarations, kind) { |
| this.type = Syntax.VariableDeclaration; |
| this.declarations = declarations; |
| this.kind = kind; |
| this.finish(); |
| return this; |
| }, |
| |
| finishVariableDeclarator: function (id, init) { |
| this.type = Syntax.VariableDeclarator; |
| this.id = id; |
| this.init = init; |
| this.finish(); |
| return this; |
| }, |
| |
| finishWhileStatement: function (test, body) { |
| this.type = Syntax.WhileStatement; |
| this.test = test; |
| this.body = body; |
| this.finish(); |
| return this; |
| }, |
| |
| finishWithStatement: function (object, body) { |
| this.type = Syntax.WithStatement; |
| this.object = object; |
| this.body = body; |
| this.finish(); |
| return this; |
| }, |
| |
| finishExportSpecifier: function (local, exported) { |
| this.type = Syntax.ExportSpecifier; |
| this.exported = exported || local; |
| this.local = local; |
| this.finish(); |
| return this; |
| }, |
| |
| finishImportDefaultSpecifier: function (local) { |
| this.type = Syntax.ImportDefaultSpecifier; |
| this.local = local; |
| this.finish(); |
| return this; |
| }, |
| |
| finishImportNamespaceSpecifier: function (local) { |
| this.type = Syntax.ImportNamespaceSpecifier; |
| this.local = local; |
| this.finish(); |
| return this; |
| }, |
| |
| finishExportNamedDeclaration: function (declaration, specifiers, src) { |
| this.type = Syntax.ExportNamedDeclaration; |
| this.declaration = declaration; |
| this.specifiers = specifiers; |
| this.source = src; |
| this.finish(); |
| return this; |
| }, |
| |
| finishExportDefaultDeclaration: function (declaration) { |
| this.type = Syntax.ExportDefaultDeclaration; |
| this.declaration = declaration; |
| this.finish(); |
| return this; |
| }, |
| |
| finishExportAllDeclaration: function (src) { |
| this.type = Syntax.ExportAllDeclaration; |
| this.source = src; |
| this.finish(); |
| return this; |
| }, |
| |
| finishImportSpecifier: function (local, imported) { |
| this.type = Syntax.ImportSpecifier; |
| this.local = local || imported; |
| this.imported = imported; |
| this.finish(); |
| return this; |
| }, |
| |
| finishImportDeclaration: function (specifiers, src) { |
| this.type = Syntax.ImportDeclaration; |
| this.specifiers = specifiers; |
| this.source = src; |
| this.finish(); |
| return this; |
| }, |
| |
| finishYieldExpression: function (argument, delegate) { |
| this.type = Syntax.YieldExpression; |
| this.argument = argument; |
| this.delegate = delegate; |
| this.finish(); |
| return this; |
| } |
| }; |
| |
| |
| function recordError(error) { |
| var e, existing; |
| |
| for (e = 0; e < extra.errors.length; e++) { |
| existing = extra.errors[e]; |
| // Prevent duplicated error. |
| /* istanbul ignore next */ |
| if (existing.index === error.index && existing.message === error.message) { |
| return; |
| } |
| } |
| |
| extra.errors.push(error); |
| } |
| |
| function createError(line, pos, description) { |
| var error = new Error('Line ' + line + ': ' + description); |
| error.index = pos; |
| error.lineNumber = line; |
| error.column = pos - (scanning ? lineStart : lastLineStart) + 1; |
| error.description = description; |
| return error; |
| } |
| |
| // Throw an exception |
| |
| function throwError(messageFormat) { |
| var args, msg; |
| |
| args = Array.prototype.slice.call(arguments, 1); |
| msg = messageFormat.replace(/%(\d)/g, |
| function (whole, idx) { |
| assert(idx < args.length, 'Message reference must be in range'); |
| return args[idx]; |
| } |
| ); |
| |
| throw createError(lastLineNumber, lastIndex, msg); |
| } |
| |
| function tolerateError(messageFormat) { |
| var args, msg, error; |
| |
| args = Array.prototype.slice.call(arguments, 1); |
| /* istanbul ignore next */ |
| msg = messageFormat.replace(/%(\d)/g, |
| function (whole, idx) { |
| assert(idx < args.length, 'Message reference must be in range'); |
| return args[idx]; |
| } |
| ); |
| |
| error = createError(lineNumber, lastIndex, msg); |
| if (extra.errors) { |
| recordError(error); |
| } else { |
| throw error; |
| } |
| } |
| |
| // Throw an exception because of the token. |
| |
| function unexpectedTokenError(token, message) { |
| var value, msg = message || Messages.UnexpectedToken; |
| |
| if (token) { |
| if (!message) { |
| msg = (token.type === Token.EOF) ? Messages.UnexpectedEOS : |
| (token.type === Token.Identifier) ? Messages.UnexpectedIdentifier : |
| (token.type === Token.NumericLiteral) ? Messages.UnexpectedNumber : |
| (token.type === Token.StringLiteral) ? Messages.UnexpectedString : |
| (token.type === Token.Template) ? Messages.UnexpectedTemplate : |
| Messages.UnexpectedToken; |
| |
| if (token.type === Token.Keyword) { |
| if (isFutureReservedWord(token.value)) { |
| msg = Messages.UnexpectedReserved; |
| } else if (strict && isStrictModeReservedWord(token.value)) { |
| msg = Messages.StrictReservedWord; |
| } |
| } |
| } |
| |
| value = (token.type === Token.Template) ? token.value.raw : token.value; |
| } else { |
| value = 'ILLEGAL'; |
| } |
| |
| msg = msg.replace('%0', value); |
| |
| return (token && typeof token.lineNumber === 'number') ? |
| createError(token.lineNumber, token.start, msg) : |
| createError(scanning ? lineNumber : lastLineNumber, scanning ? index : lastIndex, msg); |
| } |
| |
| function throwUnexpectedToken(token, message) { |
| throw unexpectedTokenError(token, message); |
| } |
| |
| function tolerateUnexpectedToken(token, message) { |
| var error = unexpectedTokenError(token, message); |
| if (extra.errors) { |
| recordError(error); |
| } else { |
| throw error; |
| } |
| } |
| |
| // 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) { |
| throwUnexpectedToken(token); |
| } |
| } |
| |
| /** |
| * @name expectCommaSeparator |
| * @description Quietly expect a comma when in tolerant mode, otherwise delegates |
| * to <code>expect(value)</code> |
| * @since 2.0 |
| */ |
| function expectCommaSeparator() { |
| var token; |
| |
| if (extra.errors) { |
| token = lookahead; |
| if (token.type === Token.Punctuator && token.value === ',') { |
| lex(); |
| } else if (token.type === Token.Punctuator && token.value === ';') { |
| lex(); |
| tolerateUnexpectedToken(token); |
| } else { |
| tolerateUnexpectedToken(token, Messages.UnexpectedToken); |
| } |
| } else { |
| expect(','); |
| } |
| } |
| |
| // 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) { |
| throwUnexpectedToken(token); |
| } |
| } |
| |
| // Return true if the next token matches the specified punctuator. |
| |
| function match(value) { |
| return lookahead.type === Token.Punctuator && lookahead.value === value; |
| } |
| |
| // Return true if the next token matches the specified keyword |
| |
| function matchKeyword(keyword) { |
| return lookahead.type === Token.Keyword && lookahead.value === keyword; |
| } |
| |
| // Return true if the next token matches the specified contextual keyword |
| // (where an identifier is sometimes a keyword depending on the context) |
| |
| function matchContextualKeyword(keyword) { |
| return lookahead.type === Token.Identifier && lookahead.value === keyword; |
| } |
| |
| // Return true if the next token is an assignment operator |
| |
| function matchAssign() { |
| var op; |
| |
| if (lookahead.type !== Token.Punctuator) { |
| return false; |
| } |
| op = lookahead.value; |
| return op === '=' || |
| op === '*=' || |
| op === '/=' || |
| op === '%=' || |
| op === '+=' || |
| op === '-=' || |
| op === '<<=' || |
| op === '>>=' || |
| op === '>>>=' || |
| op === '&=' || |
| op === '^=' || |
| op === '|='; |
| } |
| |
| function consumeSemicolon() { |
| // Catch the very common case first: immediately a semicolon (U+003B). |
| if (source.charCodeAt(startIndex) === 0x3B || match(';')) { |
| lex(); |
| return; |
| } |
| |
| if (hasLineTerminator) { |
| return; |
| } |
| |
| // FIXME(ikarienator): this is seemingly an issue in the previous location info convention. |
| lastIndex = startIndex; |
| lastLineNumber = startLineNumber; |
| lastLineStart = startLineStart; |
| |
| if (lookahead.type !== Token.EOF && !match('}')) { |
| throwUnexpectedToken(lookahead); |
| } |
| } |
| |
| // Cover grammar support. |
| // |
| // When an assignment expression position starts with an left parenthesis, the determination of the type |
| // of the syntax is to be deferred arbitrarily long until the end of the parentheses pair (plus a lookahead) |
| // or the first comma. This situation also defers the determination of all the expressions nested in the pair. |
| // |
| // There are three productions that can be parsed in a parentheses pair that needs to be determined |
| // after the outermost pair is closed. They are: |
| // |
| // 1. AssignmentExpression |
| // 2. BindingElements |
| // 3. AssignmentTargets |
| // |
| // In order to avoid exponential backtracking, we use two flags to denote if the production can be |
| // binding element or assignment target. |
| // |
| // The three productions have the relationship: |
| // |
| // BindingElements ⊆ AssignmentTargets ⊆ AssignmentExpression |
| // |
| // with a single exception that CoverInitializedName when used directly in an Expression, generates |
| // an early error. Therefore, we need the third state, firstCoverInitializedNameError, to track the |
| // first usage of CoverInitializedName and report it when we reached the end of the parentheses pair. |
| // |
| // isolateCoverGrammar function runs the given parser function with a new cover grammar context, and it does not |
| // effect the current flags. This means the production the parser parses is only used as an expression. Therefore |
| // the CoverInitializedName check is conducted. |
| // |
| // inheritCoverGrammar function runs the given parse function with a new cover grammar context, and it propagates |
| // the flags outside of the parser. This means the production the parser parses is used as a part of a potential |
| // pattern. The CoverInitializedName check is deferred. |
| function isolateCoverGrammar(parser) { |
| var oldIsBindingElement = isBindingElement, |
| oldIsAssignmentTarget = isAssignmentTarget, |
| oldFirstCoverInitializedNameError = firstCoverInitializedNameError, |
| result; |
| isBindingElement = true; |
| isAssignmentTarget = true; |
| firstCoverInitializedNameError = null; |
| result = parser(); |
| if (firstCoverInitializedNameError !== null) { |
| throwUnexpectedToken(firstCoverInitializedNameError); |
| } |
| isBindingElement = oldIsBindingElement; |
| isAssignmentTarget = oldIsAssignmentTarget; |
| firstCoverInitializedNameError = oldFirstCoverInitializedNameError; |
| return result; |
| } |
| |
| function inheritCoverGrammar(parser) { |
| var oldIsBindingElement = isBindingElement, |
| oldIsAssignmentTarget = isAssignmentTarget, |
| oldFirstCoverInitializedNameError = firstCoverInitializedNameError, |
| result; |
| isBindingElement = true; |
| isAssignmentTarget = true; |
| firstCoverInitializedNameError = null; |
| result = parser(); |
| isBindingElement = isBindingElement && oldIsBindingElement; |
| isAssignmentTarget = isAssignmentTarget && oldIsAssignmentTarget; |
| firstCoverInitializedNameError = oldFirstCoverInitializedNameError || firstCoverInitializedNameError; |
| return result; |
| } |
| |
| function parseArrayPattern(params) { |
| var node = new Node(), elements = [], rest, restNode; |
| expect('['); |
| |
| while (!match(']')) { |
| if (match(',')) { |
| lex(); |
| elements.push(null); |
| } else { |
| if (match('...')) { |
| restNode = new Node(); |
| lex(); |
| params.push(lookahead); |
| rest = parseVariableIdentifier(params); |
| elements.push(restNode.finishRestElement(rest)); |
| break; |
| } else { |
| elements.push(parsePatternWithDefault(params)); |
| } |
| if (!match(']')) { |
| expect(','); |
| } |
| } |
| |
| } |
| |
| expect(']'); |
| |
| return node.finishArrayPattern(elements); |
| } |
| |
| function parsePropertyPattern(params) { |
| var node = new Node(), key, keyToken, computed = match('['), init; |
| if (lookahead.type === Token.Identifier) { |
| keyToken = lookahead; |
| key = parseVariableIdentifier(); |
| if (match('=')) { |
| params.push(keyToken); |
| lex(); |
| init = parseAssignmentExpression(); |
| |
| return node.finishProperty( |
| 'init', key, false, |
| new WrappingNode(keyToken).finishAssignmentPattern(key, init), false, false); |
| } else if (!match(':')) { |
| params.push(keyToken); |
| return node.finishProperty('init', key, false, key, false, true); |
| } |
| } else { |
| key = parseObjectPropertyKey(params); |
| } |
| expect(':'); |
| init = parsePatternWithDefault(params); |
| return node.finishProperty('init', key, computed, init, false, false); |
| } |
| |
| function parseObjectPattern(params) { |
| var node = new Node(), properties = []; |
| |
| expect('{'); |
| |
| while (!match('}')) { |
| properties.push(parsePropertyPattern(params)); |
| if (!match('}')) { |
| expect(','); |
| } |
| } |
| |
| lex(); |
| |
| return node.finishObjectPattern(properties); |
| } |
| |
| function parsePattern(params) { |
| var identifier; |
| if (lookahead.type === Token.Identifier) { |
| params.push(lookahead); |
| identifier = parseVariableIdentifier(); |
| return identifier; |
| } else if (match('[')) { |
| return parseArrayPattern(params); |
| } else if (match('{')) { |
| return parseObjectPattern(params); |
| } |
| throwUnexpectedToken(lookahead); |
| } |
| |
| function parsePatternWithDefault(params) { |
| var startToken = lookahead, pattern, right; |
| pattern = parsePattern(params); |
| if (match('=')) { |
| lex(); |
| right = isolateCoverGrammar(parseAssignmentExpression); |
| pattern = new WrappingNode(startToken).finishAssignmentPattern(pattern, right); |
| } |
| return pattern; |
| } |
| |
| // 11.1.4 Array Initialiser |
| |
| function parseArrayInitialiser() { |
| var elements = [], node = new Node(), restSpread; |
| |
| expect('['); |
| |
| while (!match(']')) { |
| if (match(',')) { |
| lex(); |
| elements.push(null); |
| } else if (match('...')) { |
| restSpread = new Node(); |
| lex(); |
| restSpread.finishSpreadElement(inheritCoverGrammar(parseAssignmentExpression)); |
| |
| if (!match(']')) { |
| isAssignmentTarget = isBindingElement = false; |
| expect(','); |
| } |
| elements.push(restSpread); |
| } else { |
| elements.push(inheritCoverGrammar(parseAssignmentExpression)); |
| |
| if (!match(']')) { |
| expect(','); |
| } |
| } |
| } |
| |
| lex(); |
| |
| return node.finishArrayExpression(elements); |
| } |
| |
| // 11.1.5 Object Initialiser |
| |
| function parsePropertyFunction(node, paramInfo, isGenerator) { |
| var previousStrict, body; |
| |
| isAssignmentTarget = isBindingElement = false; |
| |
| previousStrict = strict; |
| body = isolateCoverGrammar(parseFunctionSourceElements); |
| |
| if (strict && paramInfo.firstRestricted) { |
| tolerateUnexpectedToken(paramInfo.firstRestricted, paramInfo.message); |
| } |
| if (strict && paramInfo.stricted) { |
| tolerateUnexpectedToken(paramInfo.stricted, paramInfo.message); |
| } |
| |
| strict = previousStrict; |
| return node.finishFunctionExpression(null, paramInfo.params, paramInfo.defaults, body, isGenerator); |
| } |
| |
| function parsePropertyMethodFunction() { |
| var params, method, node = new Node(), |
| previousAllowYield = state.allowYield; |
| |
| state.allowYield = false; |
| params = parseParams(); |
| state.allowYield = previousAllowYield; |
| |
| state.allowYield = false; |
| method = parsePropertyFunction(node, params, false); |
| state.allowYield = previousAllowYield; |
| |
| return method; |
| } |
| |
| function parseObjectPropertyKey() { |
| var token, node = new Node(), expr; |
| |
| token = lex(); |
| |
| // Note: This function is called only from parseObjectProperty(), where |
| // EOF and Punctuator tokens are already filtered out. |
| |
| switch (token.type) { |
| case Token.StringLiteral: |
| case Token.NumericLiteral: |
| if (strict && token.octal) { |
| tolerateUnexpectedToken(token, Messages.StrictOctalLiteral); |
| } |
| return node.finishLiteral(token); |
| case Token.Identifier: |
| case Token.BooleanLiteral: |
| case Token.NullLiteral: |
| case Token.Keyword: |
| return node.finishIdentifier(token.value); |
| case Token.Punctuator: |
| if (token.value === '[') { |
| expr = isolateCoverGrammar(parseAssignmentExpression); |
| expect(']'); |
| return expr; |
| } |
| break; |
| } |
| throwUnexpectedToken(token); |
| } |
| |
| function lookaheadPropertyName() { |
| switch (lookahead.type) { |
| case Token.Identifier: |
| case Token.StringLiteral: |
| case Token.BooleanLiteral: |
| case Token.NullLiteral: |
| case Token.NumericLiteral: |
| case Token.Keyword: |
| return true; |
| case Token.Punctuator: |
| return lookahead.value === '['; |
| } |
| return false; |
| } |
| |
| // This function is to try to parse a MethodDefinition as defined in 14.3. But in the case of object literals, |
| // it might be called at a position where there is in fact a short hand identifier pattern or a data property. |
| // This can only be determined after we consumed up to the left parentheses. |
| // |
| // In order to avoid back tracking, it returns `null` if the position is not a MethodDefinition and the caller |
| // is responsible to visit other options. |
| function tryParseMethodDefinition(token, key, computed, node) { |
| var value, options, methodNode, params, |
| previousAllowYield = state.allowYield; |
| |
| if (token.type === Token.Identifier) { |
| // check for `get` and `set`; |
| |
| if (token.value === 'get' && lookaheadPropertyName()) { |
| computed = match('['); |
| key = parseObjectPropertyKey(); |
| methodNode = new Node(); |
| expect('('); |
| expect(')'); |
| |
| state.allowYield = false; |
| value = parsePropertyFunction(methodNode, { |
| params: [], |
| defaults: [], |
| stricted: null, |
| firstRestricted: null, |
| message: null |
| }, false); |
| state.allowYield = previousAllowYield; |
| |
| return node.finishProperty('get', key, computed, value, false, false); |
| } else if (token.value === 'set' && lookaheadPropertyName()) { |
| computed = match('['); |
| key = parseObjectPropertyKey(); |
| methodNode = new Node(); |
| expect('('); |
| |
| options = { |
| params: [], |
| defaultCount: 0, |
| defaults: [], |
| firstRestricted: null, |
| paramSet: {} |
| }; |
| if (match(')')) { |
| tolerateUnexpectedToken(lookahead); |
| } else { |
| state.allowYield = false; |
| parseParam(options); |
| state.allowYield = previousAllowYield; |
| if (options.defaultCount === 0) { |
| options.defaults = []; |
| } |
| } |
| expect(')'); |
| |
| state.allowYield = false; |
| value = parsePropertyFunction(methodNode, options, false); |
| state.allowYield = previousAllowYield; |
| |
| return node.finishProperty('set', key, computed, value, false, false); |
| } |
| } else if (token.type === Token.Punctuator && token.value === '*' && lookaheadPropertyName()) { |
| computed = match('['); |
| key = parseObjectPropertyKey(); |
| methodNode = new Node(); |
| |
| state.allowYield = false; |
| params = parseParams(); |
| state.allowYield = previousAllowYield; |
| |
| state.allowYield = true; |
| value = parsePropertyFunction(methodNode, params, true); |
| state.allowYield = previousAllowYield; |
| |
| return node.finishProperty('init', key, computed, value, true, false); |
| } |
| |
| if (key && match('(')) { |
| value = parsePropertyMethodFunction(); |
| return node.finishProperty('init', key, computed, value, true, false); |
| } |
| |
| // Not a MethodDefinition. |
| return null; |
| } |
| |
| function checkProto(key, computed, hasProto) { |
| if (computed === false && (key.type === Syntax.Identifier && key.name === '__proto__' || |
| key.type === Syntax.Literal && key.value === '__proto__')) { |
| if (hasProto.value) { |
| tolerateError(Messages.DuplicateProtoProperty); |
| } else { |
| hasProto.value = true; |
| } |
| } |
| } |
| |
| function parseObjectProperty(hasProto) { |
| var token = lookahead, node = new Node(), computed, key, maybeMethod, value; |
| |
| computed = match('['); |
| if (match('*')) { |
| lex(); |
| } else { |
| key = parseObjectPropertyKey(); |
| } |
| maybeMethod = tryParseMethodDefinition(token, key, computed, node); |
| |
| if (maybeMethod) { |
| checkProto(maybeMethod.key, maybeMethod.computed, hasProto); |
| // finished |
| return maybeMethod; |
| } |
| |
| if (!key) { |
| throwUnexpectedToken(lookahead); |
| } |
| |
| // init property or short hand property. |
| checkProto(key, computed, hasProto); |
| |
| if (match(':')) { |
| lex(); |
| value = inheritCoverGrammar(parseAssignmentExpression); |
| return node.finishProperty('init', key, computed, value, false, false); |
| } |
| |
| if (token.type === Token.Identifier) { |
| if (match('=')) { |
| firstCoverInitializedNameError = lookahead; |
| lex(); |
| value = isolateCoverGrammar(parseAssignmentExpression); |
| return node.finishProperty('init', key, computed, |
| new WrappingNode(token).finishAssignmentPattern(key, value), false, true); |
| } |
| return node.finishProperty('init', key, computed, key, false, true); |
| } |
| |
| throwUnexpectedToken(lookahead); |
| } |
| |
| function parseObjectInitialiser() { |
| var properties = [], hasProto = {value: false}, node = new Node(); |
| |
| expect('{'); |
| |
| while (!match('}')) { |
| properties.push(parseObjectProperty(hasProto)); |
| |
| if (!match('}')) { |
| expectCommaSeparator(); |
| } |
| } |
| |
| expect('}'); |
| |
| return node.finishObjectExpression(properties); |
| } |
| |
| function reinterpretExpressionAsPattern(expr) { |
| var i; |
| switch (expr.type) { |
| case Syntax.Identifier: |
| case Syntax.MemberExpression: |
| case Syntax.RestElement: |
| case Syntax.AssignmentPattern: |
| break; |
| case Syntax.SpreadElement: |
| expr.type = Syntax.RestElement; |
| reinterpretExpressionAsPattern(expr.argument); |
| break; |
| case Syntax.ArrayExpression: |
| expr.type = Syntax.ArrayPattern; |
| for (i = 0; i < expr.elements.length; i++) { |
| if (expr.elements[i] !== null) { |
| reinterpretExpressionAsPattern(expr.elements[i]); |
| } |
| } |
| break; |
| case Syntax.ObjectExpression: |
| expr.type = Syntax.ObjectPattern; |
| for (i = 0; i < expr.properties.length; i++) { |
| reinterpretExpressionAsPattern(expr.properties[i].value); |
| } |
| break; |
| case Syntax.AssignmentExpression: |
| expr.type = Syntax.AssignmentPattern; |
| reinterpretExpressionAsPattern(expr.left); |
| break; |
| default: |
| // Allow other node type for tolerant parsing. |
| break; |
| } |
| } |
| |
| function parseTemplateElement(option) { |
| var node, token; |
| |
| if (lookahead.type !== Token.Template || (option.head && !lookahead.head)) { |
| throwUnexpectedToken(); |
| } |
| |
| node = new Node(); |
| token = lex(); |
| |
| return node.finishTemplateElement({ raw: token.value.raw, cooked: token.value.cooked }, token.tail); |
| } |
| |
| function parseTemplateLiteral() { |
| var quasi, quasis, expressions, node = new Node(); |
| |
| quasi = parseTemplateElement({ head: true }); |
| quasis = [ quasi ]; |
| expressions = []; |
| |
| while (!quasi.tail) { |
| expressions.push(parseExpression()); |
| quasi = parseTemplateElement({ head: false }); |
| quasis.push(quasi); |
| } |
| |
| return node.finishTemplateLiteral(quasis, expressions); |
| } |
| |
| // 11.1.6 The Grouping Operator |
| |
| function parseGroupExpression() { |
| var expr, expressions, startToken, i, params = []; |
| |
| expect('('); |
| |
| if (match(')')) { |
| lex(); |
| if (!match('=>')) { |
| expect('=>'); |
| } |
| return { |
| type: PlaceHolders.ArrowParameterPlaceHolder, |
| params: [], |
| rawParams: [] |
| }; |
| } |
| |
| startToken = lookahead; |
| if (match('...')) { |
| expr = parseRestElement(params); |
| expect(')'); |
| if (!match('=>')) { |
| expect('=>'); |
| } |
| return { |
| type: PlaceHolders.ArrowParameterPlaceHolder, |
| params: [expr] |
| }; |
| } |
| |
| isBindingElement = true; |
| expr = inheritCoverGrammar(parseAssignmentExpression); |
| |
| if (match(',')) { |
| isAssignmentTarget = false; |
| expressions = [expr]; |
| |
| while (startIndex < length) { |
| if (!match(',')) { |
| break; |
| } |
| lex(); |
| |
| if (match('...')) { |
| if (!isBindingElement) { |
| throwUnexpectedToken(lookahead); |
| } |
| expressions.push(parseRestElement(params)); |
| expect(')'); |
| if (!match('=>')) { |
| expect('=>'); |
| } |
| isBindingElement = false; |
| for (i = 0; i < expressions.length; i++) { |
| reinterpretExpressionAsPattern(expressions[i]); |
| } |
| return { |
| type: PlaceHolders.ArrowParameterPlaceHolder, |
| params: expressions |
| }; |
| } |
| |
| expressions.push(inheritCoverGrammar(parseAssignmentExpression)); |
| } |
| |
| expr = new WrappingNode(startToken).finishSequenceExpression(expressions); |
| } |
| |
| |
| expect(')'); |
| |
| if (match('=>')) { |
| if (!isBindingElement) { |
| throwUnexpectedToken(lookahead); |
| } |
| |
| if (expr.type === Syntax.SequenceExpression) { |
| for (i = 0; i < expr.expressions.length; i++) { |
| reinterpretExpressionAsPattern(expr.expressions[i]); |
| } |
| } else { |
| reinterpretExpressionAsPattern(expr); |
| } |
| |
| expr = { |
| type: PlaceHolders.ArrowParameterPlaceHolder, |
| params: expr.type === Syntax.SequenceExpression ? expr.expressions : [expr] |
| }; |
| } |
| isBindingElement = false; |
| return expr; |
| } |
| |
| |
| // 11.1 Primary Expressions |
| |
| function parsePrimaryExpression() { |
| var type, token, expr, node; |
| |
| if (match('(')) { |
| isBindingElement = false; |
| return inheritCoverGrammar(parseGroupExpression); |
| } |
| |
| if (match('[')) { |
| return inheritCoverGrammar(parseArrayInitialiser); |
| } |
| |
| if (match('{')) { |
| return inheritCoverGrammar(parseObjectInitialiser); |
| } |
| |
| type = lookahead.type; |
| node = new Node(); |
| |
| if (type === Token.Identifier) { |
| expr = node.finishIdentifier(lex().value); |
| } else if (type === Token.StringLiteral || type === Token.NumericLiteral) { |
| isAssignmentTarget = isBindingElement = false; |
| if (strict && lookahead.octal) { |
| tolerateUnexpectedToken(lookahead, Messages.StrictOctalLiteral); |
| } |
| expr = node.finishLiteral(lex()); |
| } else if (type === Token.Keyword) { |
| isAssignmentTarget = isBindingElement = false; |
| if (matchKeyword('function')) { |
| return parseFunctionExpression(); |
| } |
| if (matchKeyword('this')) { |
| lex(); |
| return node.finishThisExpression(); |
| } |
| if (matchKeyword('class')) { |
| return parseClassExpression(); |
| } |
| throwUnexpectedToken(lex()); |
| } else if (type === Token.BooleanLiteral) { |
| isAssignmentTarget = isBindingElement = false; |
| token = lex(); |
| token.value = (token.value === 'true'); |
| expr = node.finishLiteral(token); |
| } else if (type === Token.NullLiteral) { |
| isAssignmentTarget = isBindingElement = false; |
| token = lex(); |
| token.value = null; |
| expr = node.finishLiteral(token); |
| } else if (match('/') || match('/=')) { |
| isAssignmentTarget = isBindingElement = false; |
| index = startIndex; |
| |
| if (typeof extra.tokens !== 'undefined') { |
| token = collectRegex(); |
| } else { |
| token = scanRegExp(); |
| } |
| lex(); |
| expr = node.finishLiteral(token); |
| } else if (type === Token.Template) { |
| expr = parseTemplateLiteral(); |
| } else { |
| throwUnexpectedToken(lex()); |
| } |
| |
| return expr; |
| } |
| |
| // 11.2 Left-Hand-Side Expressions |
| |
| function parseArguments() { |
| var args = [], expr; |
| |
| expect('('); |
| |
| if (!match(')')) { |
| while (startIndex < length) { |
| if (match('...')) { |
| expr = new Node(); |
| lex(); |
| expr.finishSpreadElement(isolateCoverGrammar(parseAssignmentExpression)); |
| } else { |
| expr = isolateCoverGrammar(parseAssignmentExpression); |
| } |
| args.push(expr); |
| if (match(')')) { |
| break; |
| } |
| expectCommaSeparator(); |
| } |
| } |
| |
| expect(')'); |
| |
| return args; |
| } |
| |
| function parseNonComputedProperty() { |
| var token, node = new Node(); |
| |
| token = lex(); |
| |
| if (!isIdentifierName(token)) { |
| throwUnexpectedToken(token); |
| } |
| |
| return node.finishIdentifier(token.value); |
| } |
| |
| function parseNonComputedMember() { |
| expect('.'); |
| |
| return parseNonComputedProperty(); |
| } |
| |
| function parseComputedMember() { |
| var expr; |
| |
| expect('['); |
| |
| expr = isolateCoverGrammar(parseExpression); |
| |
| expect(']'); |
| |
| return expr; |
| } |
| |
| function parseNewExpression() { |
| var callee, args, node = new Node(); |
| |
| expectKeyword('new'); |
| callee = isolateCoverGrammar(parseLeftHandSideExpression); |
| args = match('(') ? parseArguments() : []; |
| |
| isAssignmentTarget = isBindingElement = false; |
| |
| return node.finishNewExpression(callee, args); |
| } |
| |
| function parseLeftHandSideExpressionAllowCall() { |
| var quasi, expr, args, property, startToken, previousAllowIn = state.allowIn; |
| |
| startToken = lookahead; |
| state.allowIn = true; |
| |
| if (matchKeyword('super') && state.inFunctionBody) { |
| expr = new Node(); |
| lex(); |
| expr = expr.finishSuper(); |
| if (!match('(') && !match('.') && !match('[')) { |
| throwUnexpectedToken(lookahead); |
| } |
| } else { |
| expr = inheritCoverGrammar(matchKeyword('new') ? parseNewExpression : parsePrimaryExpression); |
| } |
| |
| for (;;) { |
| if (match('.')) { |
| isBindingElement = false; |
| isAssignmentTarget = true; |
| property = parseNonComputedMember(); |
| expr = new WrappingNode(startToken).finishMemberExpression('.', expr, property); |
| } else if (match('(')) { |
| isBindingElement = false; |
| isAssignmentTarget = false; |
| args = parseArguments(); |
| expr = new WrappingNode(startToken).finishCallExpression(expr, args); |
| } else if (match('[')) { |
| isBindingElement = false; |
| isAssignmentTarget = true; |
| property = parseComputedMember(); |
| expr = new WrappingNode(startToken).finishMemberExpression('[', expr, property); |
| } else if (lookahead.type === Token.Template && lookahead.head) { |
| quasi = parseTemplateLiteral(); |
| expr = new WrappingNode(startToken).finishTaggedTemplateExpression(expr, quasi); |
| } else { |
| break; |
| } |
| } |
| state.allowIn = previousAllowIn; |
| |
| return expr; |
| } |
| |
| function parseLeftHandSideExpression() { |
| var quasi, expr, property, startToken; |
| assert(state.allowIn, 'callee of new expression always allow in keyword.'); |
| |
| startToken = lookahead; |
| |
| if (matchKeyword('super') && state.inFunctionBody) { |
| expr = new Node(); |
| lex(); |
| expr = expr.finishSuper(); |
| if (!match('[') && !match('.')) { |
| throwUnexpectedToken(lookahead); |
| } |
| } else { |
| expr = inheritCoverGrammar(matchKeyword('new') ? parseNewExpression : parsePrimaryExpression); |
| } |
| |
| for (;;) { |
| if (match('[')) { |
| isBindingElement = false; |
| isAssignmentTarget = true; |
| property = parseComputedMember(); |
| expr = new WrappingNode(startToken).finishMemberExpression('[', expr, property); |
| } else if (match('.')) { |
| isBindingElement = false; |
| isAssignmentTarget = true; |
| property = parseNonComputedMember(); |
| expr = new WrappingNode(startToken).finishMemberExpression('.', expr, property); |
| } else if (lookahead.type === Token.Template && lookahead.head) { |
| quasi = parseTemplateLiteral(); |
| expr = new WrappingNode(startToken).finishTaggedTemplateExpression(expr, quasi); |
| } else { |
| break; |
| } |
| } |
| return expr; |
| } |
| |
| // 11.3 Postfix Expressions |
| |
| function parsePostfixExpression() { |
| var expr, token, startToken = lookahead; |
| |
| expr = inheritCoverGrammar(parseLeftHandSideExpressionAllowCall); |
| |
| if (!hasLineTerminator && lookahead.type === Token.Punctuator) { |
| if (match('++') || match('--')) { |
| // 11.3.1, 11.3.2 |
| if (strict && expr.type === Syntax.Identifier && isRestrictedWord(expr.name)) { |
| tolerateError(Messages.StrictLHSPostfix); |
| } |
| |
| if (!isAssignmentTarget) { |
| tolerateError(Messages.InvalidLHSInAssignment); |
| } |
| |
| isAssignmentTarget = isBindingElement = false; |
| |
| token = lex(); |
| expr = new WrappingNode(startToken).finishPostfixExpression(token.value, expr); |
| } |
| } |
| |
| return expr; |
| } |
| |
| // 11.4 Unary Operators |
| |
| function parseUnaryExpression() { |
| var token, expr, startToken; |
| |
| if (lookahead.type !== Token.Punctuator && lookahead.type !== Token.Keyword) { |
| expr = parsePostfixExpression(); |
| } else if (match('++') || match('--')) { |
| startToken = lookahead; |
| token = lex(); |
| expr = inheritCoverGrammar(parseUnaryExpression); |
| // 11.4.4, 11.4.5 |
| if (strict && expr.type === Syntax.Identifier && isRestrictedWord(expr.name)) { |
| tolerateError(Messages.StrictLHSPrefix); |
| } |
| |
| if (!isAssignmentTarget) { |
| tolerateError(Messages.InvalidLHSInAssignment); |
| } |
| expr = new WrappingNode(startToken).finishUnaryExpression(token.value, expr); |
| isAssignmentTarget = isBindingElement = false; |
| } else if (match('+') || match('-') || match('~') || match('!')) { |
| startToken = lookahead; |
| token = lex(); |
| expr = inheritCoverGrammar(parseUnaryExpression); |
| expr = new WrappingNode(startToken).finishUnaryExpression(token.value, expr); |
| isAssignmentTarget = isBindingElement = false; |
| } else if (matchKeyword('delete') || matchKeyword('void') || matchKeyword('typeof')) { |
| startToken = lookahead; |
| token = lex(); |
| expr = inheritCoverGrammar(parseUnaryExpression); |
| expr = new WrappingNode(startToken).finishUnaryExpression(token.value, expr); |
| if (strict && expr.operator === 'delete' && expr.argument.type === Syntax.Identifier) { |
| tolerateError(Messages.StrictDelete); |
| } |
| isAssignmentTarget = isBindingElement = false; |
| } else { |
| expr = parsePostfixExpression(); |
| } |
| |
| return expr; |
| } |
| |
| function binaryPrecedence(token, allowIn) { |
| var prec = 0; |
| |
| if (token.type !== Token.Punctuator && token.type !== Token.Keyword) { |
| return 0; |
| } |
| |
| switch (token.value) { |
| case '||': |
| prec = 1; |
| break; |
| |
| case '&&': |
| prec = 2; |
| break; |
| |
| case '|': |
| prec = 3; |
| break; |
| |
| case '^': |
| prec = 4; |
| break; |
| |
| case '&': |
| prec = 5; |
| break; |
| |
| case '==': |
| case '!=': |
| case '===': |
| case '!==': |
| prec = 6; |
| break; |
| |
| case '<': |
| case '>': |
| case '<=': |
| case '>=': |
| case 'instanceof': |
| prec = 7; |
| break; |
| |
| case 'in': |
| prec = allowIn ? 7 : 0; |
| break; |
| |
| case '<<': |
| case '>>': |
| case '>>>': |
| prec = 8; |
| break; |
| |
| case '+': |
| case '-': |
| prec = 9; |
| break; |
| |
| case '*': |
| case '/': |
| case '%': |
| prec = 11; |
| break; |
| |
| default: |
| break; |
| } |
| |
| return prec; |
| } |
| |
| // 11.5 Multiplicative Operators |
| // 11.6 Additive Operators |
| // 11.7 Bitwise Shift Operators |
| // 11.8 Relational Operators |
| // 11.9 Equality Operators |
| // 11.10 Binary Bitwise Operators |
| // 11.11 Binary Logical Operators |
| |
| function parseBinaryExpression() { |
| var marker, markers, expr, token, prec, stack, right, operator, left, i; |
| |
| marker = lookahead; |
| left = inheritCoverGrammar(parseUnaryExpression); |
| |
| token = lookahead; |
| prec = binaryPrecedence(token, state.allowIn); |
| if (prec === 0) { |
| return left; |
| } |
| isAssignmentTarget = isBindingElement = false; |
| token.prec = prec; |
| lex(); |
| |
| markers = [marker, lookahead]; |
| right = isolateCoverGrammar(parseUnaryExpression); |
| |
| stack = [left, token, right]; |
| |
| while ((prec = binaryPrecedence(lookahead, state.allowIn)) > 0) { |
| |
| // Reduce: make a binary expression from the three topmost entries. |
| while ((stack.length > 2) && (prec <= stack[stack.length - 2].prec)) { |
| right = stack.pop(); |
| operator = stack.pop().value; |
| left = stack.pop(); |
| markers.pop(); |
| expr = new WrappingNode(markers[markers.length - 1]).finishBinaryExpression(operator, left, right); |
| stack.push(expr); |
| } |
| |
| // Shift. |
| token = lex(); |
| token.prec = prec; |
| stack.push(token); |
| markers.push(lookahead); |
| expr = isolateCoverGrammar(parseUnaryExpression); |
| stack.push(expr); |
| } |
| |
| // Final reduce to clean-up the stack. |
| i = stack.length - 1; |
| expr = stack[i]; |
| markers.pop(); |
| while (i > 1) { |
| expr = new WrappingNode(markers.pop()).finishBinaryExpression(stack[i - 1].value, stack[i - 2], expr); |
| i -= 2; |
| } |
| |
| return expr; |
| } |
| |
| |
| // 11.12 Conditional Operator |
| |
| function parseConditionalExpression() { |
| var expr, previousAllowIn, consequent, alternate, startToken; |
| |
| startToken = lookahead; |
| |
| expr = inheritCoverGrammar(parseBinaryExpression); |
| if (match('?')) { |
| lex(); |
| previousAllowIn = state.allowIn; |
| state.allowIn = true; |
| consequent = isolateCoverGrammar(parseAssignmentExpression); |
| state.allowIn = previousAllowIn; |
| expect(':'); |
| alternate = isolateCoverGrammar(parseAssignmentExpression); |
| |
| expr = new WrappingNode(startToken).finishConditionalExpression(expr, consequent, alternate); |
| isAssignmentTarget = isBindingElement = false; |
| } |
| |
| return expr; |
| } |
| |
| // [ES6] 14.2 Arrow Function |
| |
| function parseConciseBody() { |
| if (match('{')) { |
| return parseFunctionSourceElements(); |
| } |
| return isolateCoverGrammar(parseAssignmentExpression); |
| } |
| |
| function checkPatternParam(options, param) { |
| var i; |
| switch (param.type) { |
| case Syntax.Identifier: |
| validateParam(options, param, param.name); |
| break; |
| case Syntax.RestElement: |
| checkPatternParam(options, param.argument); |
| break; |
| case Syntax.AssignmentPattern: |
| checkPatternParam(options, param.left); |
| break; |
| case Syntax.ArrayPattern: |
| for (i = 0; i < param.elements.length; i++) { |
| if (param.elements[i] !== null) { |
| checkPatternParam(options, param.elements[i]); |
| } |
| } |
| break; |
| default: |
| assert(param.type === Syntax.ObjectPattern, 'Invalid type'); |
| for (i = 0; i < param.properties.length; i++) { |
| checkPatternParam(options, param.properties[i].value); |
| } |
| break; |
| } |
| } |
| function reinterpretAsCoverFormalsList(expr) { |
| var i, len, param, params, defaults, defaultCount, options, token; |
| |
| defaults = []; |
| defaultCount = 0; |
| params = [expr]; |
| |
| switch (expr.type) { |
| case Syntax.Identifier: |
| break; |
| case PlaceHolders.ArrowParameterPlaceHolder: |
| params = expr.params; |
| break; |
| default: |
| return null; |
| } |
| |
| options = { |
| paramSet: {} |
| }; |
| |
| for (i = 0, len = params.length; i < len; i += 1) { |
| param = params[i]; |
| switch (param.type) { |
| case Syntax.AssignmentPattern: |
| params[i] = param.left; |
| defaults.push(param.right); |
| ++defaultCount; |
| checkPatternParam(options, param.left); |
| break; |
| default: |
| checkPatternParam(options, param); |
| params[i] = param; |
| defaults.push(null); |
| break; |
| } |
| } |
| |
| if (options.message === Messages.StrictParamDupe) { |
| token = strict ? options.stricted : options.firstRestricted; |
| throwUnexpectedToken(token, options.message); |
| } |
| |
| if (defaultCount === 0) { |
| defaults = []; |
| } |
| |
| return { |
| params: params, |
| defaults: defaults, |
| stricted: options.stricted, |
| firstRestricted: options.firstRestricted, |
| message: options.message |
| }; |
| } |
| |
| function parseArrowFunctionExpression(options, node) { |
| var previousStrict, body; |
| |
| if (hasLineTerminator) { |
| tolerateUnexpectedToken(lookahead); |
| } |
| expect('=>'); |
| previousStrict = strict; |
| |
| body = parseConciseBody(); |
| |
| if (strict && options.firstRestricted) { |
| throwUnexpectedToken(options.firstRestricted, options.message); |
| } |
| if (strict && options.stricted) { |
| tolerateUnexpectedToken(options.stricted, options.message); |
| } |
| |
| strict = previousStrict; |
| |
| return node.finishArrowFunctionExpression(options.params, options.defaults, body, body.type !== Syntax.BlockStatement); |
| } |
| |
| // [ES6] 14.4 Yield expression |
| |
| function parseYieldExpression() { |
| var argument, expr, delegate; |
| |
| expr = new Node(); |
| |
| if (!state.allowYield) { |
| tolerateUnexpectedToken(lookahead, Messages.IllegalYield); |
| } |
| |
| expectKeyword('yield'); |
| |
| if (!hasLineTerminator) { |
| delegate = match('*'); |
| if (delegate) { |
| lex(); |
| argument = parseExpression(); |
| } else { |
| if (!match(';') && !match('}') && lookahead.type !== Token.EOF) { |
| argument = parseExpression(); |
| } |
| } |
| } |
| |
| return expr.finishYieldExpression(argument, delegate); |
| } |
| |
| // 11.13 Assignment Operators |
| |
| function parseAssignmentExpression() { |
| var token, expr, right, list, startToken; |
| |
| startToken = lookahead; |
| token = lookahead; |
| |
| if (matchKeyword('yield')) { |
| return parseYieldExpression(); |
| } |
| |
| expr = parseConditionalExpression(); |
| |
| if (expr.type === PlaceHolders.ArrowParameterPlaceHolder || match('=>')) { |
| isAssignmentTarget = isBindingElement = false; |
| list = reinterpretAsCoverFormalsList(expr); |
| |
| if (list) { |
| firstCoverInitializedNameError = null; |
| return parseArrowFunctionExpression(list, new WrappingNode(startToken)); |
| } |
| |
| return expr; |
| } |
| |
| if (matchAssign()) { |
| if (!isAssignmentTarget) { |
| tolerateError(Messages.InvalidLHSInAssignment); |
| } |
| |
| // 11.13.1 |
| if (strict && expr.type === Syntax.Identifier && isRestrictedWord(expr.name)) { |
| tolerateUnexpectedToken(token, Messages.StrictLHSAssignment); |
| } |
| |
| if (!match('=')) { |
| isAssignmentTarget = isBindingElement = false; |
| } else { |
| reinterpretExpressionAsPattern(expr); |
| } |
| |
| token = lex(); |
| right = isolateCoverGrammar(parseAssignmentExpression); |
| expr = new WrappingNode(startToken).finishAssignmentExpression(token.value, expr, right); |
| firstCoverInitializedNameError = null; |
| } |
| |
| return expr; |
| } |
| |
| // 11.14 Comma Operator |
| |
| function parseExpression() { |
| var expr, startToken = lookahead, expressions; |
| |
| expr = isolateCoverGrammar(parseAssignmentExpression); |
| |
| if (match(',')) { |
| expressions = [expr]; |
| |
| while (startIndex < length) { |
| if (!match(',')) { |
| break; |
| } |
| lex(); |
| expressions.push(isolateCoverGrammar(parseAssignmentExpression)); |
| } |
| |
| expr = new WrappingNode(startToken).finishSequenceExpression(expressions); |
| } |
| |
| return expr; |
| } |
| |
| // 12.1 Block |
| |
| function parseStatementListItem() { |
| if (lookahead.type === Token.Keyword) { |
| switch (lookahead.value) { |
| case 'export': |
| if (sourceType !== 'module') { |
| tolerateUnexpectedToken(lookahead, Messages.IllegalExportDeclaration); |
| } |
| return parseExportDeclaration(); |
| case 'import': |
| if (sourceType !== 'module') { |
| tolerateUnexpectedToken(lookahead, Messages.IllegalImportDeclaration); |
| } |
| return parseImportDeclaration(); |
| case 'const': |
| case 'let': |
| return parseLexicalDeclaration({inFor: false}); |
| case 'function': |
| return parseFunctionDeclaration(new Node()); |
| case 'class': |
| return parseClassDeclaration(); |
| } |
| } |
| |
| return parseStatement(); |
| } |
| |
| function parseStatementList() { |
| var list = []; |
| while (startIndex < length) { |
| if (match('}')) { |
| break; |
| } |
| list.push(parseStatementListItem()); |
| } |
| |
| return list; |
| } |
| |
| function parseBlock() { |
| var block, node = new Node(); |
| |
| expect('{'); |
| |
| block = parseStatementList(); |
| |
| expect('}'); |
| |
| return node.finishBlockStatement(block); |
| } |
| |
| // 12.2 Variable Statement |
| |
| function parseVariableIdentifier() { |
| var token, node = new Node(); |
| |
| token = lex(); |
| |
| if (token.type !== Token.Identifier) { |
| if (strict && token.type === Token.Keyword && isStrictModeReservedWord(token.value)) { |
| tolerateUnexpectedToken(token, Messages.StrictReservedWord); |
| } else { |
| throwUnexpectedToken(token); |
| } |
| } |
| |
| return node.finishIdentifier(token.value); |
| } |
| |
| function parseVariableDeclaration() { |
| var init = null, id, node = new Node(), params = []; |
| |
| id = parsePattern(params); |
| |
| // 12.2.1 |
| if (strict && isRestrictedWord(id.name)) { |
| tolerateError(Messages.StrictVarName); |
| } |
| |
| if (match('=')) { |
| lex(); |
| init = isolateCoverGrammar(parseAssignmentExpression); |
| } else if (id.type !== Syntax.Identifier) { |
| expect('='); |
| } |
| |
| return node.finishVariableDeclarator(id, init); |
| } |
| |
| function parseVariableDeclarationList() { |
| var list = []; |
| |
| do { |
| list.push(parseVariableDeclaration()); |
| if (!match(',')) { |
| break; |
| } |
| lex(); |
| } while (startIndex < length); |
| |
| return list; |
| } |
| |
| function parseVariableStatement(node) { |
| var declarations; |
| |
| expectKeyword('var'); |
| |
| declarations = parseVariableDeclarationList(); |
| |
| consumeSemicolon(); |
| |
| return node.finishVariableDeclaration(declarations); |
| } |
| |
| function parseLexicalBinding(kind, options) { |
| var init = null, id, node = new Node(), params = []; |
| |
| id = parsePattern(params); |
| |
| // 12.2.1 |
| if (strict && id.type === Syntax.Identifier && isRestrictedWord(id.name)) { |
| tolerateError(Messages.StrictVarName); |
| } |
| |
| if (kind === 'const') { |
| if (!matchKeyword('in') && !matchContextualKeyword('of')) { |
| expect('='); |
| init = isolateCoverGrammar(parseAssignmentExpression); |
| } |
| } else if ((!options.inFor && id.type !== Syntax.Identifier) || match('=')) { |
| expect('='); |
| init = isolateCoverGrammar(parseAssignmentExpression); |
| } |
| |
| return node.finishVariableDeclarator(id, init); |
| } |
| |
| function parseBindingList(kind, options) { |
| var list = []; |
| |
| do { |
| list.push(parseLexicalBinding(kind, options)); |
| if (!match(',')) { |
| break; |
| } |
| lex(); |
| } while (startIndex < length); |
| |
| return list; |
| } |
| |
| function parseLexicalDeclaration(options) { |
| var kind, declarations, node = new Node(); |
| |
| kind = lex().value; |
| assert(kind === 'let' || kind === 'const', 'Lexical declaration must be either let or const'); |
| |
| declarations = parseBindingList(kind, options); |
| |
| consumeSemicolon(); |
| |
| return node.finishLexicalDeclaration(declarations, kind); |
| } |
| |
| function parseRestElement(params) { |
| var param, node = new Node(); |
| |
| lex(); |
| |
| if (match('{')) { |
| throwError(Messages.ObjectPatternAsRestParameter); |
| } |
| |
| params.push(lookahead); |
| |
| param = parseVariableIdentifier(); |
| |
| if (match('=')) { |
| throwError(Messages.DefaultRestParameter); |
| } |
| |
| if (!match(')')) { |
| throwError(Messages.ParameterAfterRestParameter); |
| } |
| |
| return node.finishRestElement(param); |
| } |
| |
| // 12.3 Empty Statement |
| |
| function parseEmptyStatement(node) { |
| expect(';'); |
| return node.finishEmptyStatement(); |
| } |
| |
| // 12.4 Expression Statement |
| |
| function parseExpressionStatement(node) { |
| var expr = parseExpression(); |
| consumeSemicolon(); |
| return node.finishExpressionStatement(expr); |
| } |
| |
| // 12.5 If statement |
| |
| function parseIfStatement(node) { |
| var test, consequent, alternate; |
| |
| expectKeyword('if'); |
| |
| expect('('); |
| |
| test = parseExpression(); |
| |
| expect(')'); |
| |
| consequent = parseStatement(); |
| |
| if (matchKeyword('else')) { |
| lex(); |
| alternate = parseStatement(); |
| } else { |
| alternate = null; |
| } |
| |
| return node.finishIfStatement(test, consequent, alternate); |
| } |
| |
| // 12.6 Iteration Statements |
| |
| function parseDoWhileStatement(node) { |
| 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 node.finishDoWhileStatement(body, test); |
| } |
| |
| function parseWhileStatement(node) { |
| var test, body, oldInIteration; |
| |
| expectKeyword('while'); |
| |
| expect('('); |
| |
| test = parseExpression(); |
| |
| expect(')'); |
| |
| oldInIteration = state.inIteration; |
| state.inIteration = true; |
| |
| body = parseStatement(); |
| |
| state.inIteration = oldInIteration; |
| |
| return node.finishWhileStatement(test, body); |
| } |
| |
| function parseForStatement(node) { |
| var init, forIn, initSeq, initStartToken, test, update, left, right, kind, declarations, |
| body, oldInIteration, previousAllowIn = state.allowIn; |
| |
| init = test = update = null; |
| forIn = true; |
| |
| expectKeyword('for'); |
| |
| expect('('); |
| |
| if (match(';')) { |
| lex(); |
| } else { |
| if (matchKeyword('var')) { |
| init = new Node(); |
| lex(); |
| |
| state.allowIn = false; |
| init = init.finishVariableDeclaration(parseVariableDeclarationList()); |
| state.allowIn = previousAllowIn; |
| |
| if (init.declarations.length === 1 && matchKeyword('in')) { |
| lex(); |
| left = init; |
| right = parseExpression(); |
| init = null; |
| } else if (init.declarations.length === 1 && init.declarations[0].init === null && matchContextualKeyword('of')) { |
| lex(); |
| left = init; |
| right = parseAssignmentExpression(); |
| init = null; |
| forIn = false; |
| } else { |
| expect(';'); |
| } |
| } else if (matchKeyword('const') || matchKeyword('let')) { |
| init = new Node(); |
| kind = lex().value; |
| |
| state.allowIn = false; |
| declarations = parseBindingList(kind, {inFor: true}); |
| state.allowIn = previousAllowIn; |
| |
| if (declarations.length === 1 && declarations[0].init === null && matchKeyword('in')) { |
| init = init.finishLexicalDeclaration(declarations, kind); |
| lex(); |
| left = init; |
| right = parseExpression(); |
| init = null; |
| } else if (declarations.length === 1 && declarations[0].init === null && matchContextualKeyword('of')) { |
| init = init.finishLexicalDeclaration(declarations, kind); |
| lex(); |
| left = init; |
| right = parseAssignmentExpression(); |
| init = null; |
| forIn = false; |
| } else { |
| consumeSemicolon(); |
| init = init.finishLexicalDeclaration(declarations, kind); |
| } |
| } else { |
| initStartToken = lookahead; |
| state.allowIn = false; |
| init = inheritCoverGrammar(parseAssignmentExpression); |
| state.allowIn = previousAllowIn; |
| |
| if (matchKeyword('in')) { |
| if (!isAssignmentTarget) { |
| tolerateError(Messages.InvalidLHSInForIn); |
| } |
| |
| lex(); |
| reinterpretExpressionAsPattern(init); |
| left = init; |
| right = parseExpression(); |
| init = null; |
| } else if (matchContextualKeyword('of')) { |
| if (!isAssignmentTarget) { |
| tolerateError(Messages.InvalidLHSInForLoop); |
| } |
| |
| lex(); |
| reinterpretExpressionAsPattern(init); |
| left = init; |
| right = parseAssignmentExpression(); |
| init = null; |
| forIn = false; |
| } else { |
| if (match(',')) { |
| initSeq = [init]; |
| while (match(',')) { |
| lex(); |
| initSeq.push(isolateCoverGrammar(parseAssignmentExpression)); |
| } |
| init = new WrappingNode(initStartToken).finishSequenceExpression(initSeq); |
| } |
| expect(';'); |
| } |
| } |
| } |
| |
| if (typeof left === 'undefined') { |
| |
| if (!match(';')) { |
| test = parseExpression(); |
| } |
| expect(';'); |
| |
| if (!match(')')) { |
| update = parseExpression(); |
| } |
| } |
| |
| expect(')'); |
| |
| oldInIteration = state.inIteration; |
| state.inIteration = true; |
| |
| body = isolateCoverGrammar(parseStatement); |
| |
| state.inIteration = oldInIteration; |
| |
| return (typeof left === 'undefined') ? |
| node.finishForStatement(init, test, update, body) : |
| forIn ? node.finishForInStatement(left, right, body) : |
| node.finishForOfStatement(left, right, body); |
| } |
| |
| // 12.7 The continue statement |
| |
| function parseContinueStatement(node) { |
| var label = null, key; |
| |
| expectKeyword('continue'); |
| |
| // Optimize the most common form: 'continue;'. |
| if (source.charCodeAt(startIndex) === 0x3B) { |
| lex(); |
| |
| if (!state.inIteration) { |
| throwError(Messages.IllegalContinue); |
| } |
| |
| return node.finishContinueStatement(null); |
| } |
| |
| if (hasLineTerminator) { |
| if (!state.inIteration) { |
| throwError(Messages.IllegalContinue); |
| } |
| |
| return node.finishContinueStatement(null); |
| } |
| |
| if (lookahead.type === Token.Identifier) { |
| label = parseVariableIdentifier(); |
| |
| key = '$' + label.name; |
| if (!Object.prototype.hasOwnProperty.call(state.labelSet, key)) { |
| throwError(Messages.UnknownLabel, label.name); |
| } |
| } |
| |
| consumeSemicolon(); |
| |
| if (label === null && !state.inIteration) { |
| throwError(Messages.IllegalContinue); |
| } |
| |
| return node.finishContinueStatement(label); |
| } |
| |
| // 12.8 The break statement |
| |
| function parseBreakStatement(node) { |
| var label = null, key; |
| |
| expectKeyword('break'); |
| |
| // Catch the very common case first: immediately a semicolon (U+003B). |
| if (source.charCodeAt(lastIndex) === 0x3B) { |
| lex(); |
| |
| if (!(state.inIteration || state.inSwitch)) { |
| throwError(Messages.IllegalBreak); |
| } |
| |
| return node.finishBreakStatement(null); |
| } |
| |
| if (hasLineTerminator) { |
| if (!(state.inIteration || state.inSwitch)) { |
| throwError(Messages.IllegalBreak); |
| } |
| |
| return node.finishBreakStatement(null); |
| } |
| |
| if (lookahead.type === Token.Identifier) { |
| label = parseVariableIdentifier(); |
| |
| key = '$' + label.name; |
| if (!Object.prototype.hasOwnProperty.call(state.labelSet, key)) { |
| throwError(Messages.UnknownLabel, label.name); |
| } |
| } |
| |
| consumeSemicolon(); |
| |
| if (label === null && !(state.inIteration || state.inSwitch)) { |
| throwError(Messages.IllegalBreak); |
| } |
| |
| return node.finishBreakStatement(label); |
| } |
| |
| // 12.9 The return statement |
| |
| function parseReturnStatement(node) { |
| var argument = null; |
| |
| expectKeyword('return'); |
| |
| if (!state.inFunctionBody) { |
| tolerateError(Messages.IllegalReturn); |
| } |
| |
| // 'return' followed by a space and an identifier is very common. |
| if (source.charCodeAt(lastIndex) === 0x20) { |
| if (isIdentifierStart(source.charCodeAt(lastIndex + 1))) { |
| argument = parseExpression(); |
| consumeSemicolon(); |
| return node.finishReturnStatement(argument); |
| } |
| } |
| |
| if (hasLineTerminator) { |
| // HACK |
| return node.finishReturnStatement(null); |
| } |
| |
| if (!match(';')) { |
| if (!match('}') && lookahead.type !== Token.EOF) { |
| argument = parseExpression(); |
| } |
| } |
| |
| consumeSemicolon(); |
| |
| return node.finishReturnStatement(argument); |
| } |
| |
| // 12.10 The with statement |
| |
| function parseWithStatement(node) { |
| var object, body; |
| |
| if (strict) { |
| tolerateError(Messages.StrictModeWith); |
| } |
| |
| expectKeyword('with'); |
| |
| expect('('); |
| |
| object = parseExpression(); |
| |
| expect(')'); |
| |
| body = parseStatement(); |
| |
| return node.finishWithStatement(object, body); |
| } |
| |
| // 12.10 The swith statement |
| |
| function parseSwitchCase() { |
| var test, consequent = [], statement, node = new Node(); |
| |
| if (matchKeyword('default')) { |
| lex(); |
| test = null; |
| } else { |
| expectKeyword('case'); |
| test = parseExpression(); |
| } |
| expect(':'); |
| |
| while (startIndex < length) { |
| if (match('}') || matchKeyword('default') || matchKeyword('case')) { |
| break; |
| } |
| statement = parseStatementListItem(); |
| consequent.push(statement); |
| } |
| |
| return node.finishSwitchCase(test, consequent); |
| } |
| |
| function parseSwitchStatement(node) { |
| var discriminant, cases, clause, oldInSwitch, defaultFound; |
| |
| expectKeyword('switch'); |
| |
| expect('('); |
| |
| discriminant = parseExpression(); |
| |
| expect(')'); |
| |
| expect('{'); |
| |
| cases = []; |
| |
| if (match('}')) { |
| lex(); |
| return node.finishSwitchStatement(discriminant, cases); |
| } |
| |
| oldInSwitch = state.inSwitch; |
| state.inSwitch = true; |
| defaultFound = false; |
| |
| while (startIndex < length) { |
| if (match('}')) { |
| break; |
| } |
| clause = parseSwitchCase(); |
| if (clause.test === null) { |
| if (defaultFound) { |
| throwError(Messages.MultipleDefaultsInSwitch); |
| } |
| defaultFound = true; |
| } |
| cases.push(clause); |
| } |
| |
| state.inSwitch = oldInSwitch; |
| |
| expect('}'); |
| |
| return node.finishSwitchStatement(discriminant, cases); |
| } |
| |
| // 12.13 The throw statement |
| |
| function parseThrowStatement(node) { |
| var argument; |
| |
| expectKeyword('throw'); |
| |
| if (hasLineTerminator) { |
| throwError(Messages.NewlineAfterThrow); |
| } |
| |
| argument = parseExpression(); |
| |
| consumeSemicolon(); |
| |
| return node.finishThrowStatement(argument); |
| } |
| |
| // 12.14 The try statement |
| |
| function parseCatchClause() { |
| var param, params = [], paramMap = {}, key, i, body, node = new Node(); |
| |
| expectKeyword('catch'); |
| |
| expect('('); |
| if (match(')')) { |
| throwUnexpectedToken(lookahead); |
| } |
| |
| param = parsePattern(params); |
| for (i = 0; i < params.length; i++) { |
| key = '$' + params[i].value; |
| if (Object.prototype.hasOwnProperty.call(paramMap, key)) { |
| tolerateError(Messages.DuplicateBinding, params[i].value); |
| } |
| paramMap[key] = true; |
| } |
| |
| // 12.14.1 |
| if (strict && isRestrictedWord(param.name)) { |
| tolerateError(Messages.StrictCatchVariable); |
| } |
| |
| expect(')'); |
| body = parseBlock(); |
| return node.finishCatchClause(param, body); |
| } |
| |
| function parseTryStatement(node) { |
| var block, handler = null, finalizer = null; |
| |
| expectKeyword('try'); |
| |
| block = parseBlock(); |
| |
| if (matchKeyword('catch')) { |
| handler = parseCatchClause(); |
| } |
| |
| if (matchKeyword('finally')) { |
| lex(); |
| finalizer = parseBlock(); |
| } |
| |
| if (!handler && !finalizer) { |
| throwError(Messages.NoCatchOrFinally); |
| } |
| |
| return node.finishTryStatement(block, handler, finalizer); |
| } |
| |
| // 12.15 The debugger statement |
| |
| function parseDebuggerStatement(node) { |
| expectKeyword('debugger'); |
| |
| consumeSemicolon(); |
| |
| return node.finishDebuggerStatement(); |
| } |
| |
| // 12 Statements |
| |
| function parseStatement() { |
| var type = lookahead.type, |
| expr, |
| labeledBody, |
| key, |
| node; |
| |
| if (type === Token.EOF) { |
| throwUnexpectedToken(lookahead); |
| } |
| |
| if (type === Token.Punctuator && lookahead.value === '{') { |
| return parseBlock(); |
| } |
| isAssignmentTarget = isBindingElement = true; |
| node = new Node(); |
| |
| if (type === Token.Punctuator) { |
| switch (lookahead.value) { |
| case ';': |
| return parseEmptyStatement(node); |
| case '(': |
| return parseExpressionStatement(node); |
| default: |
| break; |
| } |
| } else if (type === Token.Keyword) { |
| switch (lookahead.value) { |
| case 'break': |
| return parseBreakStatement(node); |
| case 'continue': |
| return parseContinueStatement(node); |
| case 'debugger': |
| return parseDebuggerStatement(node); |
| case 'do': |
| return parseDoWhileStatement(node); |
| case 'for': |
| return parseForStatement(node); |
| case 'function': |
| return parseFunctionDeclaration(node); |
| case 'if': |
| return parseIfStatement(node); |
| case 'return': |
| return parseReturnStatement(node); |
| case 'switch': |
| return parseSwitchStatement(node); |
| case 'throw': |
| return parseThrowStatement(node); |
| case 'try': |
| return parseTryStatement(node); |
| case 'var': |
| return parseVariableStatement(node); |
| case 'while': |
| return parseWhileStatement(node); |
| case 'with': |
| return parseWithStatement(node); |
| default: |
| break; |
| } |
| } |
| |
| expr = parseExpression(); |
| |
| // 12.12 Labelled Statements |
| if ((expr.type === Syntax.Identifier) && match(':')) { |
| lex(); |
| |
| key = '$' + expr.name; |
| if (Object.prototype.hasOwnProperty.call(state.labelSet, key)) { |
| throwError(Messages.Redeclaration, 'Label', expr.name); |
| } |
| |
| state.labelSet[key] = true; |
| labeledBody = parseStatement(); |
| delete state.labelSet[key]; |
| return node.finishLabeledStatement(expr, labeledBody); |
| } |
| |
| consumeSemicolon(); |
| |
| return node.finishExpressionStatement(expr); |
| } |
| |
| // 13 Function Definition |
| |
| function parseFunctionSourceElements() { |
| var statement, body = [], token, directive, firstRestricted, |
| oldLabelSet, oldInIteration, oldInSwitch, oldInFunctionBody, oldParenthesisCount, |
| node = new Node(); |
| |
| expect('{'); |
| |
| while (startIndex < length) { |
| if (lookahead.type !== Token.StringLiteral) { |
| break; |
| } |
| token = lookahead; |
| |
| statement = parseStatementListItem(); |
| body.push(statement); |
| if (statement.expression.type !== Syntax.Literal) { |
| // this is not directive |
| break; |
| } |
| directive = source.slice(token.start + 1, token.end - 1); |
| if (directive === 'use strict') { |
| strict = true; |
| if (firstRestricted) { |
| tolerateUnexpectedToken(firstRestricted, Messages.StrictOctalLiteral); |
| } |
| } else { |
| if (!firstRestricted && token.octal) { |
| firstRestricted = token; |
| } |
| } |
| } |
| |
| oldLabelSet = state.labelSet; |
| oldInIteration = state.inIteration; |
| oldInSwitch = state.inSwitch; |
| oldInFunctionBody = state.inFunctionBody; |
| oldParenthesisCount = state.parenthesizedCount; |
| |
| state.labelSet = {}; |
| state.inIteration = false; |
| state.inSwitch = false; |
| state.inFunctionBody = true; |
| state.parenthesizedCount = 0; |
| |
| while (startIndex < length) { |
| if (match('}')) { |
| break; |
| } |
| body.push(parseStatementListItem()); |
| } |
| |
| expect('}'); |
| |
| state.labelSet = oldLabelSet; |
| state.inIteration = oldInIteration; |
| state.inSwitch = oldInSwitch; |
| state.inFunctionBody = oldInFunctionBody; |
| state.parenthesizedCount = oldParenthesisCount; |
| |
| return node.finishBlockStatement(body); |
| } |
| |
| function validateParam(options, param, name) { |
| var key = '$' + name; |
| if (strict) { |
| if (isRestrictedWord(name)) { |
| options.stricted = param; |
| options.message = Messages.StrictParamName; |
| } |
| if (Object.prototype.hasOwnProperty.call(options.paramSet, key)) { |
| options.stricted = param; |
| options.message = Messages.StrictParamDupe; |
| } |
| } else if (!options.firstRestricted) { |
| if (isRestrictedWord(name)) { |
| options.firstRestricted = param; |
| options.message = Messages.StrictParamName; |
| } else if (isStrictModeReservedWord(name)) { |
| options.firstRestricted = param; |
| options.message = Messages.StrictReservedWord; |
| } else if (Object.prototype.hasOwnProperty.call(options.paramSet, key)) { |
| options.stricted = param; |
| options.message = Messages.StrictParamDupe; |
| } |
| } |
| options.paramSet[key] = true; |
| } |
| |
| function parseParam(options) { |
| var token, param, params = [], i, def; |
| |
| token = lookahead; |
| if (token.value === '...') { |
| param = parseRestElement(params); |
| validateParam(options, param.argument, param.argument.name); |
| options.params.push(param); |
| options.defaults.push(null); |
| return false; |
| } |
| |
| param = parsePatternWithDefault(params); |
| for (i = 0; i < params.length; i++) { |
| validateParam(options, params[i], params[i].value); |
| } |
| |
| if (param.type === Syntax.AssignmentPattern) { |
| def = param.right; |
| param = param.left; |
| ++options.defaultCount; |
| } |
| |
| options.params.push(param); |
| options.defaults.push(def); |
| |
| return !match(')'); |
| } |
| |
| function parseParams(firstRestricted) { |
| var options; |
| |
| options = { |
| params: [], |
| defaultCount: 0, |
| defaults: [], |
| firstRestricted: firstRestricted |
| }; |
| |
| expect('('); |
| |
| if (!match(')')) { |
| options.paramSet = {}; |
| while (startIndex < length) { |
| if (!parseParam(options)) { |
| break; |
| } |
| expect(','); |
| } |
| } |
| |
| expect(')'); |
| |
| if (options.defaultCount === 0) { |
| options.defaults = []; |
| } |
| |
| return { |
| params: options.params, |
| defaults: options.defaults, |
| stricted: options.stricted, |
| firstRestricted: options.firstRestricted, |
| message: options.message |
| }; |
| } |
| |
| function parseFunctionDeclaration(node, identifierIsOptional) { |
| var id = null, params = [], defaults = [], body, token, stricted, tmp, firstRestricted, message, previousStrict, |
| isGenerator, previousAllowYield; |
| |
| expectKeyword('function'); |
| |
| isGenerator = match('*'); |
| if (isGenerator) { |
| lex(); |
| } |
| |
| if (!identifierIsOptional || !match('(')) { |
| token = lookahead; |
| id = parseVariableIdentifier(); |
| if (strict) { |
| if (isRestrictedWord(token.value)) { |
| tolerateUnexpectedToken(token, Messages.StrictFunctionName); |
| } |
| } else { |
| if (isRestrictedWord(token.value)) { |
| firstRestricted = token; |
| message = Messages.StrictFunctionName; |
| } else if (isStrictModeReservedWord(token.value)) { |
| firstRestricted = token; |
| message = Messages.StrictReservedWord; |
| } |
| } |
| } |
| |
| previousAllowYield = state.allowYield; |
| state.allowYield = false; |
| tmp = parseParams(firstRestricted); |
| state.allowYield = previousAllowYield; |
| |
| params = tmp.params; |
| defaults = tmp.defaults; |
| stricted = tmp.stricted; |
| firstRestricted = tmp.firstRestricted; |
| if (tmp.message) { |
| message = tmp.message; |
| } |
| |
| previousAllowYield = state.allowYield; |
| previousStrict = strict; |
| state.allowYield = isGenerator; |
| body = parseFunctionSourceElements(); |
| if (strict && firstRestricted) { |
| throwUnexpectedToken(firstRestricted, message); |
| } |
| if (strict && stricted) { |
| tolerateUnexpectedToken(stricted, message); |
| } |
| strict = previousStrict; |
| state.allowYield = previousAllowYield; |
| |
| return node.finishFunctionDeclaration(id, params, defaults, body, isGenerator); |
| } |
| |
| function parseFunctionExpression() { |
| var token, id = null, stricted, firstRestricted, message, tmp, |
| params = [], defaults = [], body, previousStrict, node = new Node(), |
| isGenerator, previousAllowYield; |
| |
| expectKeyword('function'); |
| |
| isGenerator = match('*'); |
| if (isGenerator) { |
| lex(); |
| } |
| |
| if (!match('(')) { |
| token = lookahead; |
| id = parseVariableIdentifier(); |
| if (strict) { |
| if (isRestrictedWord(token.value)) { |
| tolerateUnexpectedToken(token, Messages.StrictFunctionName); |
| } |
| } else { |
| if (isRestrictedWord(token.value)) { |
| firstRestricted = token; |
| message = Messages.StrictFunctionName; |
| } else if (isStrictModeReservedWord(token.value)) { |
| firstRestricted = token; |
| message = Messages.StrictReservedWord; |
| } |
| } |
| } |
| |
| previousAllowYield = state.allowYield; |
| state.allowYield = false; |
| tmp = parseParams(firstRestricted); |
| state.allowYield = previousAllowYield; |
| |
| params = tmp.params; |
| defaults = tmp.defaults; |
| stricted = tmp.stricted; |
| firstRestricted = tmp.firstRestricted; |
| if (tmp.message) { |
| message = tmp.message; |
| } |
| |
| previousStrict = strict; |
| previousAllowYield = state.allowYield; |
| state.allowYield = isGenerator; |
| body = parseFunctionSourceElements(); |
| |
| if (strict && firstRestricted) { |
| throwUnexpectedToken(firstRestricted, message); |
| } |
| if (strict && stricted) { |
| tolerateUnexpectedToken(stricted, message); |
| } |
| strict = previousStrict; |
| state.allowYield = previousAllowYield; |
| |
| return node.finishFunctionExpression(id, params, defaults, body, isGenerator); |
| } |
| |
| |
| function parseClassBody() { |
| var classBody, token, isStatic, hasConstructor = false, body, method, computed, key; |
| |
| classBody = new Node(); |
| |
| expect('{'); |
| body = []; |
| while (!match('}')) { |
| if (match(';')) { |
| lex(); |
| } else { |
| method = new Node(); |
| token = lookahead; |
| isStatic = false; |
| computed = match('['); |
| if (match('*')) { |
| lex(); |
| } else { |
| key = parseObjectPropertyKey(); |
| if (key.name === 'static' && (lookaheadPropertyName() || match('*'))) { |
| token = lookahead; |
| isStatic = true; |
| computed = match('['); |
| if (match('*')) { |
| lex(); |
| } else { |
| key = parseObjectPropertyKey(); |
| } |
| } |
| } |
| method = tryParseMethodDefinition(token, key, computed, method); |
| if (method) { |
| method['static'] = isStatic; |
| if (method.kind === 'init') { |
| method.kind = 'method'; |
| } |
| if (!isStatic) { |
| if (!method.computed && (method.key.name || method.key.value.toString()) === 'constructor') { |
| if (method.kind !== 'method' || !method.method || method.value.generator) { |
| throwUnexpectedToken(token, Messages.ConstructorSpecialMethod); |
| } |
| if (hasConstructor) { |
| throwUnexpectedToken(token, Messages.DuplicateConstructor); |
| } else { |
| hasConstructor = true; |
| } |
| method.kind = 'constructor'; |
| } |
| } else { |
| if (!method.computed && (method.key.name || method.key.value.toString()) === 'prototype') { |
| throwUnexpectedToken(token, Messages.StaticPrototype); |
| } |
| } |
| method.type = Syntax.MethodDefinition; |
| delete method.method; |
| delete method.shorthand; |
| body.push(method); |
| } else { |
| throwUnexpectedToken(lookahead); |
| } |
| } |
| } |
| lex(); |
| return classBody.finishClassBody(body); |
| } |
| |
| function parseClassDeclaration(identifierIsOptional) { |
| var id = null, superClass = null, classNode = new Node(), classBody, previousStrict = strict; |
| strict = true; |
| |
| expectKeyword('class'); |
| |
| if (!identifierIsOptional || lookahead.type === Token.Identifier) { |
| id = parseVariableIdentifier(); |
| } |
| |
| if (matchKeyword('extends')) { |
| lex(); |
| superClass = isolateCoverGrammar(parseLeftHandSideExpressionAllowCall); |
| } |
| classBody = parseClassBody(); |
| strict = previousStrict; |
| |
| return classNode.finishClassDeclaration(id, superClass, classBody); |
| } |
| |
| function parseClassExpression() { |
| var id = null, superClass = null, classNode = new Node(), classBody, previousStrict = strict; |
| strict = true; |
| |
| expectKeyword('class'); |
| |
| if (lookahead.type === Token.Identifier) { |
| id = parseVariableIdentifier(); |
| } |
| |
| if (matchKeyword('extends')) { |
| lex(); |
| superClass = isolateCoverGrammar(parseLeftHandSideExpressionAllowCall); |
| } |
| classBody = parseClassBody(); |
| strict = previousStrict; |
| |
| return classNode.finishClassExpression(id, superClass, classBody); |
| } |
| |
| // Modules grammar from: |
| // people.mozilla.org/~jorendorff/es6-draft.html |
| |
| function parseModuleSpecifier() { |
| var node = new Node(); |
| |
| if (lookahead.type !== Token.StringLiteral) { |
| throwError(Messages.InvalidModuleSpecifier); |
| } |
| return node.finishLiteral(lex()); |
| } |
| |
| function parseExportSpecifier() { |
| var exported, local, node = new Node(), def; |
| if (matchKeyword('default')) { |
| // export {default} from 'something'; |
| def = new Node(); |
| lex(); |
| local = def.finishIdentifier('default'); |
| } else { |
| local = parseVariableIdentifier(); |
| } |
| if (matchContextualKeyword('as')) { |
| lex(); |
| exported = parseNonComputedProperty(); |
| } |
| return node.finishExportSpecifier(local, exported); |
| } |
| |
| function parseExportNamedDeclaration(node) { |
| var declaration = null, |
| isExportFromIdentifier, |
| src = null, specifiers = []; |
| |
| // non-default export |
| if (lookahead.type === Token.Keyword) { |
| // covers: |
| // export var f = 1; |
| switch (lookahead.value) { |
| case 'let': |
| case 'const': |
| case 'var': |
| case 'class': |
| case 'function': |
| declaration = parseStatementListItem(); |
| return node.finishExportNamedDeclaration(declaration, specifiers, null); |
| } |
| } |
| |
| expect('{'); |
| if (!match('}')) { |
| do { |
| isExportFromIdentifier = isExportFromIdentifier || matchKeyword('default'); |
| specifiers.push(parseExportSpecifier()); |
| } while (match(',') && lex()); |
| } |
| expect('}'); |
| |
| if (matchContextualKeyword('from')) { |
| // covering: |
| // export {default} from 'foo'; |
| // export {foo} from 'foo'; |
| lex(); |
| src = parseModuleSpecifier(); |
| consumeSemicolon(); |
| } else if (isExportFromIdentifier) { |
| // covering: |
| // export {default}; // missing fromClause |
| throwError(lookahead.value ? |
| Messages.UnexpectedToken : Messages.MissingFromClause, lookahead.value); |
| } else { |
| // cover |
| // export {foo}; |
| consumeSemicolon(); |
| } |
| return node.finishExportNamedDeclaration(declaration, specifiers, src); |
| } |
| |
| function parseExportDefaultDeclaration(node) { |
| var declaration = null, |
| expression = null; |
| |
| // covers: |
| // export default ... |
| expectKeyword('default'); |
| |
| if (matchKeyword('function')) { |
| // covers: |
| // export default function foo () {} |
| // export default function () {} |
| declaration = parseFunctionDeclaration(new Node(), true); |
| return node.finishExportDefaultDeclaration(declaration); |
| } |
| if (matchKeyword('class')) { |
| declaration = parseClassDeclaration(true); |
| return node.finishExportDefaultDeclaration(declaration); |
| } |
| |
| if (matchContextualKeyword('from')) { |
| throwError(Messages.UnexpectedToken, lookahead.value); |
| } |
| |
| // covers: |
| // export default {}; |
| // export default []; |
| // export default (1 + 2); |
| if (match('{')) { |
| expression = parseObjectInitialiser(); |
| } else if (match('[')) { |
| expression = parseArrayInitialiser(); |
| } else { |
| expression = parseAssignmentExpression(); |
| } |
| consumeSemicolon(); |
| return node.finishExportDefaultDeclaration(expression); |
| } |
| |
| function parseExportAllDeclaration(node) { |
| var src; |
| |
| // covers: |
| // export * from 'foo'; |
| expect('*'); |
| if (!matchContextualKeyword('from')) { |
| throwError(lookahead.value ? |
| Messages.UnexpectedToken : Messages.MissingFromClause, lookahead.value); |
| } |
| lex(); |
| src = parseModuleSpecifier(); |
| consumeSemicolon(); |
| |
| return node.finishExportAllDeclaration(src); |
| } |
| |
| function parseExportDeclaration() { |
| var node = new Node(); |
| if (state.inFunctionBody) { |
| throwError(Messages.IllegalExportDeclaration); |
| } |
| |
| expectKeyword('export'); |
| |
| if (matchKeyword('default')) { |
| return parseExportDefaultDeclaration(node); |
| } |
| if (match('*')) { |
| return parseExportAllDeclaration(node); |
| } |
| return parseExportNamedDeclaration(node); |
| } |
| |
| function parseImportSpecifier() { |
| // import {<foo as bar>} ...; |
| var local, imported, node = new Node(); |
| |
| imported = parseNonComputedProperty(); |
| if (matchContextualKeyword('as')) { |
| lex(); |
| local = parseVariableIdentifier(); |
| } |
| |
| return node.finishImportSpecifier(local, imported); |
| } |
| |
| function parseNamedImports() { |
| var specifiers = []; |
| // {foo, bar as bas} |
| expect('{'); |
| if (!match('}')) { |
| do { |
| specifiers.push(parseImportSpecifier()); |
| } while (match(',') && lex()); |
| } |
| expect('}'); |
| return specifiers; |
| } |
| |
| function parseImportDefaultSpecifier() { |
| // import <foo> ...; |
| var local, node = new Node(); |
| |
| local = parseNonComputedProperty(); |
| |
| return node.finishImportDefaultSpecifier(local); |
| } |
| |
| function parseImportNamespaceSpecifier() { |
| // import <* as foo> ...; |
| var local, node = new Node(); |
| |
| expect('*'); |
| if (!matchContextualKeyword('as')) { |
| throwError(Messages.NoAsAfterImportNamespace); |
| } |
| lex(); |
| local = parseNonComputedProperty(); |
| |
| return node.finishImportNamespaceSpecifier(local); |
| } |
| |
| function parseImportDeclaration() { |
| var specifiers, src, node = new Node(); |
| |
| if (state.inFunctionBody) { |
| throwError(Messages.IllegalImportDeclaration); |
| } |
| |
| expectKeyword('import'); |
| specifiers = []; |
| |
| if (lookahead.type === Token.StringLiteral) { |
| // covers: |
| // import 'foo'; |
| src = parseModuleSpecifier(); |
| consumeSemicolon(); |
| return node.finishImportDeclaration(specifiers, src); |
| } |
| |
| if (!matchKeyword('default') && isIdentifierName(lookahead)) { |
| // covers: |
| // import foo |
| // import foo, ... |
| specifiers.push(parseImportDefaultSpecifier()); |
| if (match(',')) { |
| lex(); |
| } |
| } |
| if (match('*')) { |
| // covers: |
| // import foo, * as foo |
| // import * as foo |
| specifiers.push(parseImportNamespaceSpecifier()); |
| } else if (match('{')) { |
| // covers: |
| // import foo, {bar} |
| // import {bar} |
| specifiers = specifiers.concat(parseNamedImports()); |
| } |
| |
| if (!matchContextualKeyword('from')) { |
| throwError(lookahead.value ? |
| Messages.UnexpectedToken : Messages.MissingFromClause, lookahead.value); |
| } |
| lex(); |
| src = parseModuleSpecifier(); |
| consumeSemicolon(); |
| |
| return node.finishImportDeclaration(specifiers, src); |
| } |
| |
| // 14 Program |
| |
| function parseScriptBody() { |
| var statement, body = [], token, directive, firstRestricted; |
| |
| while (startIndex < length) { |
| token = lookahead; |
| if (token.type !== Token.StringLiteral) { |
| break; |
| } |
| |
| statement = parseStatementListItem(); |
| body.push(statement); |
| if (statement.expression.type !== Syntax.Literal) { |
| // this is not directive |
| break; |
| } |
| directive = source.slice(token.start + 1, token.end - 1); |
| if (directive === 'use strict') { |
| strict = true; |
| if (firstRestricted) { |
| tolerateUnexpectedToken(firstRestricted, Messages.StrictOctalLiteral); |
| } |
| } else { |
| if (!firstRestricted && token.octal) { |
| firstRestricted = token; |
| } |
| } |
| } |
| |
| while (startIndex < length) { |
| statement = parseStatementListItem(); |
| /* istanbul ignore if */ |
| if (typeof statement === 'undefined') { |
| break; |
| } |
| body.push(statement); |
| } |
| return body; |
| } |
| |
| function parseProgram() { |
| var body, node; |
| |
| peek(); |
| node = new Node(); |
| |
| body = parseScriptBody(); |
| return node.finishProgram(body); |
| } |
| |
| function filterTokenLocation() { |
| var i, entry, token, tokens = []; |
| |
| for (i = 0; i < extra.tokens.length; ++i) { |
| entry = extra.tokens[i]; |
| token = { |
| type: entry.type, |
| value: entry.value |
| }; |
| if (entry.regex) { |
| token.regex = { |
| pattern: entry.regex.pattern, |
| flags: entry.regex.flags |
| }; |
| } |
| if (extra.range) { |
| token.range = entry.range; |
| } |
| if (extra.loc) { |
| token.loc = entry.loc; |
| } |
| tokens.push(token); |
| } |
| |
| extra.tokens = tokens; |
| } |
| |
| function tokenize(code, options) { |
| var toString, |
| tokens; |
| |
| toString = String; |
| if (typeof code !== 'string' && !(code instanceof String)) { |
| code = toString(code); |
| } |
| |
| source = code; |
| index = 0; |
| lineNumber = (source.length > 0) ? 1 : 0; |
| lineStart = 0; |
| startIndex = index; |
| startLineNumber = lineNumber; |
| startLineStart = lineStart; |
| length = source.length; |
| lookahead = null; |
| state = { |
| allowIn: true, |
| allowYield: false, |
| labelSet: {}, |
| inFunctionBody: false, |
| inIteration: false, |
| inSwitch: false, |
| lastCommentStart: -1, |
| curlyStack: [] |
| }; |
| |
| extra = {}; |
| |
| // Options matching. |
| options = options || {}; |
| |
| // Of course we collect tokens here. |
| options.tokens = true; |
| extra.tokens = []; |
| extra.tokenize = true; |
| // The following two fields are necessary to compute the Regex tokens. |
| extra.openParenToken = -1; |
| extra.openCurlyToken = -1; |
| |
| extra.range = (typeof options.range === 'boolean') && options.range; |
| extra.loc = (typeof options.loc === 'boolean') && options.loc; |
| |
| if (typeof options.comment === 'boolean' && options.comment) { |
| extra.comments = []; |
| } |
| if (typeof options.tolerant === 'boolean' && options.tolerant) { |
| extra.errors = []; |
| } |
| |
| try { |
| peek(); |
| if (lookahead.type === Token.EOF) { |
| return extra.tokens; |
| } |
| |
| lex(); |
| while (lookahead.type !== Token.EOF) { |
| try { |
| lex(); |
| } catch (lexError) { |
| if (extra.errors) { |
| recordError(lexError); |
| // We have to break on the first error |
| // to avoid infinite loops. |
| break; |
| } else { |
| throw lexError; |
| } |
| } |
| } |
| |
| filterTokenLocation(); |
| tokens = extra.tokens; |
| if (typeof extra.comments !== 'undefined') { |
| tokens.comments = extra.comments; |
| } |
| if (typeof extra.errors !== 'undefined') { |
| tokens.errors = extra.errors; |
| } |
| } catch (e) { |
| throw e; |
| } finally { |
| extra = {}; |
| } |
| return tokens; |
| } |
| |
| 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; |
| startIndex = index; |
| startLineNumber = lineNumber; |
| startLineStart = lineStart; |
| length = source.length; |
| lookahead = null; |
| state = { |
| allowIn: true, |
| allowYield: false, |
| labelSet: {}, |
| inFunctionBody: false, |
| inIteration: false, |
| inSwitch: false, |
| lastCommentStart: -1, |
| curlyStack: [] |
| }; |
| sourceType = 'script'; |
| strict = false; |
| |
| extra = {}; |
| if (typeof options !== 'undefined') { |
| extra.range = (typeof options.range === 'boolean') && options.range; |
| extra.loc = (typeof options.loc === 'boolean') && options.loc; |
| extra.attachComment = (typeof options.attachComment === 'boolean') && options.attachComment; |
| |
| if (extra.loc && options.source !== null && options.source !== undefined) { |
| extra.source = toString(options.source); |
| } |
| |
| if (typeof options.tokens === 'boolean' && options.tokens) { |
| extra.tokens = []; |
| } |
| if (typeof options.comment === 'boolean' && options.comment) { |
| extra.comments = []; |
| } |
| if (typeof options.tolerant === 'boolean' && options.tolerant) { |
| extra.errors = []; |
| } |
| if (extra.attachComment) { |
| extra.range = true; |
| extra.comments = []; |
| extra.bottomRightStack = []; |
| extra.trailingComments = []; |
| extra.leadingComments = []; |
| } |
| if (options.sourceType === 'module') { |
| // very restrictive condition for now |
| sourceType = options.sourceType; |
| strict = true; |
| } |
| } |
| |
| try { |
| program = parseProgram(); |
| if (typeof extra.comments !== 'undefined') { |
| program.comments = extra.comments; |
| } |
| if (typeof extra.tokens !== 'undefined') { |
| filterTokenLocation(); |
| program.tokens = extra.tokens; |
| } |
| if (typeof extra.errors !== 'undefined') { |
| program.errors = extra.errors; |
| } |
| } catch (e) { |
| throw e; |
| } finally { |
| extra = {}; |
| } |
| |
| return program; |
| } |
| |
| // Sync with *.json manifests. |
| exports.version = '2.4.1'; |
| |
| exports.tokenize = tokenize; |
| |
| exports.parse = parse; |
| |
| // Deep copy. |
| /* istanbul ignore next */ |
| 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; |
| }()); |
| |
| })); |
| /* vim: set sw=4 ts=4 et tw=80 : */ |
