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
33namespace JSC {
34
35 class LiteralParser {
36 public:
37 typedef enum { StrictJSON, NonStrictJSON } ParserMode;
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
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 };
72 Lexer(const UString& s, ParserMode mode)
73 : m_string(s)
74 , m_mode(mode)
75 , m_ptr(s.data())
76 , m_end(s.data() + s.size())
77 {
78 }
79
80 TokenType next()
81 {
82 return lex(m_currentToken);
83 }
84
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

source code of qtscript/src/3rdparty/javascriptcore/JavaScriptCore/runtime/LiteralParser.h