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lexer.h
1 /*
2  * This file is part of the KDE libraries
3  * Copyright (C) 1999-2000 Harri Porten (porten@kde.org)
4  *
5  * This library is free software; you can redistribute it and/or
6  * modify it under the terms of the GNU Library General Public
7  * License as published by the Free Software Foundation; either
8  * version 2 of the License, or (at your option) any later version.
9  *
10  * This library is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13  * Library General Public License for more details.
14  *
15  * You should have received a copy of the GNU Library General Public License
16  * along with this library; see the file COPYING.LIB. If not, write to
17  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
18  * Boston, MA 02110-1301, USA.
19  *
20  */
21 
22 #ifndef _KJSLEXER_H_
23 #define _KJSLEXER_H_
24 
25 #include "ustring.h"
26 
27 
28 namespace KJS {
29 
30  class Identifier;
31 
32  class RegExp;
33 
34  class Lexer {
35  public:
36  Lexer();
37  ~Lexer();
38  static Lexer *curr();
39 
40  void setCode(const UChar *c, unsigned int len);
41  int lex();
42 
43  int lineNo() const { return yylineno + 1; }
44 
45  bool prevTerminator() const { return terminator; }
46 
47  enum State { Start,
48  IdentifierOrKeyword,
49  Identifier,
50  InIdentifierOrKeyword,
51  InIdentifier,
52  InIdentifierUnicodeEscapeStart,
53  InIdentifierUnicodeEscape,
54  InSingleLineComment,
55  InMultiLineComment,
56  InNum,
57  InNum0,
58  InHex,
59  InOctal,
60  InDecimal,
61  InExponentIndicator,
62  InExponent,
63  Hex,
64  Octal,
65  Number,
66  String,
67  Eof,
68  InString,
69  InEscapeSequence,
70  InHexEscape,
71  InUnicodeEscape,
72  Other,
73  Bad };
74 
75  bool scanRegExp();
76  UString pattern, flags;
77  bool hadError() const { return foundBad; }
78 
79  static bool isWhiteSpace(unsigned short c);
80  static bool isIdentLetter(unsigned short c);
81  static bool isDecimalDigit(unsigned short c);
82  static bool isHexDigit(unsigned short c);
83  static bool isOctalDigit(unsigned short c);
84 
85  private:
86  int yylineno;
87  bool done;
88  char *buffer8;
89  UChar *buffer16;
90  unsigned int size8, size16;
91  unsigned int pos8, pos16;
92  bool terminator;
93  bool restrKeyword;
94  // encountered delimiter like "'" and "}" on last run
95  bool delimited;
96  bool skipLF;
97  bool skipCR;
98  bool convertNextIdentifier;
99  int stackToken;
100  int lastToken;
101  bool foundBad;
102 
103  State state;
104  void setDone(State s);
105  unsigned int pos;
106  void shift(unsigned int p);
107  void nextLine();
108  int lookupKeyword(const char *);
109 
110  int matchPunctuator(unsigned short c1, unsigned short c2,
111  unsigned short c3, unsigned short c4);
112  unsigned short singleEscape(unsigned short c) const;
113  unsigned short convertOctal(unsigned short c1, unsigned short c2,
114  unsigned short c3) const;
115  public:
116  static unsigned char convertHex(unsigned short c1);
117  static unsigned char convertHex(unsigned short c1, unsigned short c2);
118  static UChar convertUnicode(unsigned short c1, unsigned short c2,
119  unsigned short c3, unsigned short c4);
120 
121 #ifdef KJS_DEBUG_MEM
125  static void globalClear();
126 #endif
127 
128  void doneParsing();
129 
130  private:
131 
132  void record8(unsigned short c);
133  void record16(int c);
134  void record16(UChar c);
135 
136  KJS::Identifier *makeIdentifier(UChar *buffer, unsigned int pos);
137  UString *makeUString(UChar *buffer, unsigned int pos);
138 
139  const UChar *code;
140  unsigned int length;
141  int yycolumn;
142 #ifndef KJS_PURE_ECMA
143  int bol; // begin of line
144 #endif
145 
146  // current and following unicode characters (int to allow for -1 for end-of-file marker)
147  int current, next1, next2, next3;
148 
149  UString **strings;
150  unsigned int numStrings;
151  unsigned int stringsCapacity;
152 
153  KJS::Identifier **identifiers;
154  unsigned int numIdentifiers;
155  unsigned int identifiersCapacity;
156 
157  // for future extensions
158  class LexerPrivate;
159  LexerPrivate *priv;
160  };
161 
162 } // namespace
163 
164 #endif
KJS::Identifier
Represents an Identifier for a Javascript object.
Definition: identifier.h:32

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