1 /* 2 * Copyright (C) 2009 Apple Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY 14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR 17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26 #ifndef LiteralParser_h 27 #define LiteralParser_h 28 29 #include "JSGlobalObjectFunctions.h" 30 #include "JSValue.h" 31 #include "UString.h" 32 33 namespace JSC { 34 35 class LiteralParser { 36 public: 37 typedef enum { StrictJSON, NonStrictJSON } ParserMode; LiteralParser(ExecState * exec,const UString & s,ParserMode mode)38 LiteralParser(ExecState* exec, const UString& s, ParserMode mode) 39 : m_exec(exec) 40 , m_lexer(s, mode) 41 , m_mode(mode) 42 { 43 } 44 tryLiteralParse()45 JSValue tryLiteralParse() 46 { 47 m_lexer.next(); 48 JSValue result = parse(m_mode == StrictJSON ? StartParseExpression : StartParseStatement); 49 if (m_lexer.currentToken().type != TokEnd) 50 return JSValue(); 51 return result; 52 } 53 private: 54 enum ParserState { StartParseObject, StartParseArray, StartParseExpression, 55 StartParseStatement, StartParseStatementEndStatement, 56 DoParseObjectStartExpression, DoParseObjectEndExpression, 57 DoParseArrayStartExpression, DoParseArrayEndExpression }; 58 enum TokenType { TokLBracket, TokRBracket, TokLBrace, TokRBrace, 59 TokString, TokIdentifier, TokNumber, TokColon, 60 TokLParen, TokRParen, TokComma, TokTrue, TokFalse, 61 TokNull, TokEnd, TokError }; 62 63 class Lexer { 64 public: 65 struct LiteralParserToken { 66 TokenType type; 67 const UChar* start; 68 const UChar* end; 69 UString stringToken; 70 double numberToken; 71 }; Lexer(const UString & s,ParserMode mode)72 Lexer(const UString& s, ParserMode mode) 73 : m_string(s) 74 , m_mode(mode) 75 , m_ptr(s.characters()) 76 , m_end(s.characters() + s.length()) 77 { 78 } 79 next()80 TokenType next() 81 { 82 return lex(m_currentToken); 83 } 84 currentToken()85 const LiteralParserToken& currentToken() 86 { 87 return m_currentToken; 88 } 89 90 private: 91 TokenType lex(LiteralParserToken&); 92 template <ParserMode mode> TokenType lexString(LiteralParserToken&); 93 TokenType lexNumber(LiteralParserToken&); 94 LiteralParserToken m_currentToken; 95 UString m_string; 96 ParserMode m_mode; 97 const UChar* m_ptr; 98 const UChar* m_end; 99 }; 100 101 class StackGuard; 102 JSValue parse(ParserState); 103 104 ExecState* m_exec; 105 LiteralParser::Lexer m_lexer; 106 ParserMode m_mode; 107 }; 108 } 109 110 #endif 111