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; |
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 | |