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2 | ** |
3 | ** Copyright (C) 2015 The Qt Company Ltd. |
4 | ** Contact: http://www.qt.io/licensing/ |
5 | ** |
6 | ** This file is part of the QtScript module of the Qt Toolkit. |
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8 | ** $QT_BEGIN_LICENSE:LGPL$ |
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17 | ** GNU Lesser General Public License Usage |
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26 | ** Alternatively, this file may be used under the terms of the GNU |
27 | ** General Public License version 2.0 or (at your option) the GNU General |
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38 | ****************************************************************************/ |
39 | |
40 | #ifndef QSCRIPTLEXER_P_H |
41 | #define QSCRIPTLEXER_P_H |
42 | |
43 | // |
44 | // W A R N I N G |
45 | // ------------- |
46 | // |
47 | // This file is not part of the Qt API. It exists purely as an |
48 | // implementation detail. This header file may change from version to |
49 | // version without notice, or even be removed. |
50 | // |
51 | // We mean it. |
52 | // |
53 | |
54 | #include <QtCore/qstring.h> |
55 | |
56 | QT_BEGIN_NAMESPACE |
57 | |
58 | class QScriptEnginePrivate; |
59 | class QScriptNameIdImpl; |
60 | |
61 | namespace QScript { |
62 | |
63 | class Lexer |
64 | { |
65 | public: |
66 | Lexer(QScriptEnginePrivate *eng); |
67 | ~Lexer(); |
68 | |
69 | void setCode(const QString &c, int lineno); |
70 | int lex(); |
71 | |
72 | int currentLineNo() const { return yylineno; } |
73 | int currentColumnNo() const { return yycolumn; } |
74 | |
75 | int startLineNo() const { return startlineno; } |
76 | int startColumnNo() const { return startcolumn; } |
77 | |
78 | int endLineNo() const { return currentLineNo(); } |
79 | int endColumnNo() const |
80 | { int col = currentColumnNo(); return (col > 0) ? col - 1 : col; } |
81 | |
82 | bool prevTerminator() const { return terminator; } |
83 | |
84 | enum State { Start, |
85 | Identifier, |
86 | InIdentifier, |
87 | , |
88 | , |
89 | InNum, |
90 | InNum0, |
91 | InHex, |
92 | InOctal, |
93 | InDecimal, |
94 | InExponentIndicator, |
95 | InExponent, |
96 | Hex, |
97 | Octal, |
98 | Number, |
99 | String, |
100 | Eof, |
101 | InString, |
102 | InEscapeSequence, |
103 | InHexEscape, |
104 | InUnicodeEscape, |
105 | Other, |
106 | Bad }; |
107 | |
108 | enum Error { |
109 | NoError, |
110 | IllegalCharacter, |
111 | UnclosedStringLiteral, |
112 | IllegalEscapeSequence, |
113 | IllegalUnicodeEscapeSequence, |
114 | , |
115 | IllegalExponentIndicator, |
116 | IllegalIdentifier |
117 | }; |
118 | |
119 | enum ParenthesesState { |
120 | IgnoreParentheses, |
121 | CountParentheses, |
122 | BalancedParentheses |
123 | }; |
124 | |
125 | enum RegExpBodyPrefix { |
126 | NoPrefix, |
127 | EqualPrefix |
128 | }; |
129 | |
130 | bool scanRegExp(RegExpBodyPrefix prefix = NoPrefix); |
131 | |
132 | QScriptNameIdImpl *pattern; |
133 | int flags; |
134 | |
135 | State lexerState() const |
136 | { return state; } |
137 | |
138 | QString errorMessage() const |
139 | { return errmsg; } |
140 | void setErrorMessage(const QString &err) |
141 | { errmsg = err; } |
142 | void setErrorMessage(const char *err) |
143 | { setErrorMessage(QString::fromLatin1(str: err)); } |
144 | |
145 | Error error() const |
146 | { return err; } |
147 | void clearError() |
148 | { err = NoError; } |
149 | |
150 | private: |
151 | QScriptEnginePrivate *driver; |
152 | int yylineno; |
153 | bool done; |
154 | char *buffer8; |
155 | QChar *buffer16; |
156 | uint size8, size16; |
157 | uint pos8, pos16; |
158 | bool terminator; |
159 | bool restrKeyword; |
160 | // encountered delimiter like "'" and "}" on last run |
161 | bool delimited; |
162 | int stackToken; |
163 | |
164 | State state; |
165 | void setDone(State s); |
166 | uint pos; |
167 | void shift(uint p); |
168 | int lookupKeyword(const char *); |
169 | |
170 | bool isWhiteSpace() const; |
171 | bool isLineTerminator() const; |
172 | bool isHexDigit(ushort c) const; |
173 | bool isOctalDigit(ushort c) const; |
174 | |
175 | int matchPunctuator(ushort c1, ushort c2, |
176 | ushort c3, ushort c4); |
177 | ushort singleEscape(ushort c) const; |
178 | ushort convertOctal(ushort c1, ushort c2, |
179 | ushort c3) const; |
180 | public: |
181 | static unsigned char convertHex(ushort c1); |
182 | static unsigned char convertHex(ushort c1, ushort c2); |
183 | static QChar convertUnicode(ushort c1, ushort c2, |
184 | ushort c3, ushort c4); |
185 | static bool isIdentLetter(ushort c); |
186 | static bool isDecimalDigit(ushort c); |
187 | |
188 | inline int ival() const { return qsyylval.ival; } |
189 | inline double dval() const { return qsyylval.dval; } |
190 | inline QScriptNameIdImpl *ustr() const { return qsyylval.ustr; } |
191 | |
192 | const QChar *characterBuffer() const { return buffer16; } |
193 | int characterCount() const { return pos16; } |
194 | |
195 | private: |
196 | void record8(ushort c); |
197 | void record16(QChar c); |
198 | void recordStartPos(); |
199 | |
200 | int findReservedWord(const QChar *buffer, int size) const; |
201 | |
202 | void syncProhibitAutomaticSemicolon(); |
203 | |
204 | const QChar *code; |
205 | uint length; |
206 | int yycolumn; |
207 | int startlineno; |
208 | int startcolumn; |
209 | int bol; // begin of line |
210 | |
211 | union { |
212 | int ival; |
213 | double dval; |
214 | QScriptNameIdImpl *ustr; |
215 | } qsyylval; |
216 | |
217 | // current and following unicode characters |
218 | ushort current, next1, next2, next3; |
219 | |
220 | struct keyword { |
221 | const char *name; |
222 | int token; |
223 | }; |
224 | |
225 | QString errmsg; |
226 | Error err; |
227 | |
228 | bool wantRx; |
229 | bool check_reserved; |
230 | |
231 | ParenthesesState parenthesesState; |
232 | int parenthesesCount; |
233 | bool prohibitAutomaticSemicolon; |
234 | }; |
235 | |
236 | } // namespace QScript |
237 | |
238 | QT_END_NAMESPACE |
239 | |
240 | #endif |
241 | |