/* | |
* Copyright (C) 2009 Apple Inc. All rights reserved. | |
* | |
* Redistribution and use in source and binary forms, with or without | |
* modification, are permitted provided that the following conditions | |
* are met: | |
* 1. Redistributions of source code must retain the above copyright | |
* notice, this list of conditions and the following disclaimer. | |
* 2. 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 APPLE INC. ``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 APPLE INC. OR | |
* CONTRIBUTORS 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. | |
*/ | |
#ifndef LiteralParser_h | |
#define LiteralParser_h | |
#include "JSGlobalObjectFunctions.h" | |
#include "JSValue.h" | |
#include "UString.h" | |
namespace JSC { | |
class LiteralParser { | |
public: | |
typedef enum { StrictJSON, NonStrictJSON } ParserMode; | |
LiteralParser(ExecState* exec, const UString& s, ParserMode mode) | |
: m_exec(exec) | |
, m_lexer(s, mode) | |
, m_mode(mode) | |
{ | |
} | |
JSValue tryLiteralParse() | |
{ | |
m_lexer.next(); | |
JSValue result = parse(m_mode == StrictJSON ? StartParseExpression : StartParseStatement); | |
if (m_lexer.currentToken().type != TokEnd) | |
return JSValue(); | |
return result; | |
} | |
private: | |
enum ParserState { StartParseObject, StartParseArray, StartParseExpression, | |
StartParseStatement, StartParseStatementEndStatement, | |
DoParseObjectStartExpression, DoParseObjectEndExpression, | |
DoParseArrayStartExpression, DoParseArrayEndExpression }; | |
enum TokenType { TokLBracket, TokRBracket, TokLBrace, TokRBrace, | |
TokString, TokIdentifier, TokNumber, TokColon, | |
TokLParen, TokRParen, TokComma, TokTrue, TokFalse, | |
TokNull, TokEnd, TokError }; | |
class Lexer { | |
public: | |
struct LiteralParserToken { | |
TokenType type; | |
const UChar* start; | |
const UChar* end; | |
UString stringToken; | |
double numberToken; | |
}; | |
Lexer(const UString& s, ParserMode mode) | |
: m_string(s) | |
, m_mode(mode) | |
, m_ptr(s.data()) | |
, m_end(s.data() + s.size()) | |
{ | |
} | |
TokenType next() | |
{ | |
return lex(m_currentToken); | |
} | |
const LiteralParserToken& currentToken() | |
{ | |
return m_currentToken; | |
} | |
private: | |
TokenType lex(LiteralParserToken&); | |
template <ParserMode mode> TokenType lexString(LiteralParserToken&); | |
TokenType lexNumber(LiteralParserToken&); | |
LiteralParserToken m_currentToken; | |
UString m_string; | |
ParserMode m_mode; | |
const UChar* m_ptr; | |
const UChar* m_end; | |
}; | |
class StackGuard; | |
JSValue parse(ParserState); | |
ExecState* m_exec; | |
LiteralParser::Lexer m_lexer; | |
ParserMode m_mode; | |
}; | |
} | |
#endif |