source: webkit/trunk/JavaScriptCore/kjs/lexer.cpp@ 34607

Last change on this file since 34607 was 34607, checked in by [email protected], 17 years ago

Reviewed by Geoff Garen.

Make Identifier construction use an explicitly passed IdentifierTable.

No change on SunSpider total.
  • Property svn:eol-style set to native
File size: 22.3 KB
Line 
1/*
2 * Copyright (C) 1999-2000 Harri Porten ([email protected])
3 * Copyright (C) 2006, 2007, 2008 Apple Inc. All Rights Reserved.
4 * Copyright (C) 2007 Cameron Zwarich ([email protected])
5 *
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Library General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
10 *
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Library General Public License for more details.
15 *
16 * You should have received a copy of the GNU Library General Public License
17 * along with this library; see the file COPYING.LIB. If not, write to
18 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
19 * Boston, MA 02110-1301, USA.
20 *
21 */
22
23#include "config.h"
24#include "lexer.h"
25
26#include "dtoa.h"
27#include "JSFunction.h"
28#include "nodes.h"
29#include "NodeInfo.h"
30#include <ctype.h>
31#include <limits.h>
32#include <string.h>
33#include <wtf/Assertions.h>
34#include <wtf/unicode/Unicode.h>
35
36using namespace WTF;
37using namespace Unicode;
38
39// we can't specify the namespace in yacc's C output, so do it here
40using namespace KJS;
41
42#ifndef KDE_USE_FINAL
43#include "grammar.h"
44#endif
45
46#include "lookup.h"
47#include "lexer.lut.h"
48
49// a bridge for yacc from the C world to C++
50int kjsyylex(void* lvalp, void* llocp, void* globalData)
51{
52 return static_cast<JSGlobalData*>(globalData)->lexer->lex(lvalp, llocp);
53}
54
55namespace KJS {
56
57static bool isDecimalDigit(int);
58
59static const size_t initialReadBufferCapacity = 32;
60static const size_t initialStringTableCapacity = 64;
61
62Lexer::Lexer(JSGlobalData* globalData)
63 : yylineno(1)
64 , restrKeyword(false)
65 , eatNextIdentifier(false)
66 , stackToken(-1)
67 , lastToken(-1)
68 , pos(0)
69 , code(0)
70 , length(0)
71 , atLineStart(true)
72 , current(0)
73 , next1(0)
74 , next2(0)
75 , next3(0)
76 , m_globalData(globalData)
77 , mainTable(KJS::mainTable)
78{
79 m_buffer8.reserveCapacity(initialReadBufferCapacity);
80 m_buffer16.reserveCapacity(initialReadBufferCapacity);
81 m_strings.reserveCapacity(initialStringTableCapacity);
82 m_identifiers.reserveCapacity(initialStringTableCapacity);
83}
84
85Lexer::~Lexer()
86{
87 delete[] mainTable.table;
88}
89
90void Lexer::setCode(int startingLineNumber, PassRefPtr<SourceProvider> source)
91{
92 yylineno = startingLineNumber;
93 restrKeyword = false;
94 delimited = false;
95 eatNextIdentifier = false;
96 stackToken = -1;
97 lastToken = -1;
98
99 pos = 0;
100 m_source = source;
101 code = m_source->data();
102 length = m_source->length();
103 skipLF = false;
104 skipCR = false;
105 error = false;
106 atLineStart = true;
107
108 // read first characters
109 shift(4);
110}
111
112void Lexer::shift(unsigned p)
113{
114 // ECMA-262 calls for stripping Cf characters here, but we only do this for BOM,
115 // see <https://bugs.webkit.org/show_bug.cgi?id=4931>.
116
117 while (p--) {
118 current = next1;
119 next1 = next2;
120 next2 = next3;
121 do {
122 if (pos >= length) {
123 pos++;
124 next3 = -1;
125 break;
126 }
127 next3 = code[pos++];
128 } while (next3 == 0xFEFF);
129 }
130}
131
132// called on each new line
133void Lexer::nextLine()
134{
135 yylineno++;
136 atLineStart = true;
137}
138
139void Lexer::setDone(State s)
140{
141 state = s;
142 done = true;
143}
144
145int Lexer::lex(void* p1, void* p2)
146{
147 YYSTYPE* lvalp = static_cast<YYSTYPE*>(p1);
148 YYLTYPE* llocp = static_cast<YYLTYPE*>(p2);
149 int token = 0;
150 state = Start;
151 unsigned short stringType = 0; // either single or double quotes
152 m_buffer8.clear();
153 m_buffer16.clear();
154 done = false;
155 terminator = false;
156 skipLF = false;
157 skipCR = false;
158
159 // did we push a token on the stack previously ?
160 // (after an automatic semicolon insertion)
161 if (stackToken >= 0) {
162 setDone(Other);
163 token = stackToken;
164 stackToken = 0;
165 }
166
167 while (!done) {
168 if (skipLF && current != '\n') // found \r but not \n afterwards
169 skipLF = false;
170 if (skipCR && current != '\r') // found \n but not \r afterwards
171 skipCR = false;
172 if (skipLF || skipCR) // found \r\n or \n\r -> eat the second one
173 {
174 skipLF = false;
175 skipCR = false;
176 shift(1);
177 }
178 switch (state) {
179 case Start:
180 if (isWhiteSpace()) {
181 // do nothing
182 } else if (current == '/' && next1 == '/') {
183 shift(1);
184 state = InSingleLineComment;
185 } else if (current == '/' && next1 == '*') {
186 shift(1);
187 state = InMultiLineComment;
188 } else if (current == -1) {
189 if (!terminator && !delimited) {
190 // automatic semicolon insertion if program incomplete
191 token = ';';
192 stackToken = 0;
193 setDone(Other);
194 } else
195 setDone(Eof);
196 } else if (isLineTerminator()) {
197 nextLine();
198 terminator = true;
199 if (restrKeyword) {
200 token = ';';
201 setDone(Other);
202 }
203 } else if (current == '"' || current == '\'') {
204 state = InString;
205 stringType = static_cast<unsigned short>(current);
206 } else if (isIdentStart(current)) {
207 record16(current);
208 state = InIdentifierOrKeyword;
209 } else if (current == '\\') {
210 state = InIdentifierStartUnicodeEscapeStart;
211 } else if (current == '0') {
212 record8(current);
213 state = InNum0;
214 } else if (isDecimalDigit(current)) {
215 record8(current);
216 state = InNum;
217 } else if (current == '.' && isDecimalDigit(next1)) {
218 record8(current);
219 state = InDecimal;
220 // <!-- marks the beginning of a line comment (for www usage)
221 } else if (current == '<' && next1 == '!' &&
222 next2 == '-' && next3 == '-') {
223 shift(3);
224 state = InSingleLineComment;
225 // same for -->
226 } else if (atLineStart && current == '-' && next1 == '-' && next2 == '>') {
227 shift(2);
228 state = InSingleLineComment;
229 } else {
230 token = matchPunctuator(lvalp->intValue, current, next1, next2, next3);
231 if (token != -1) {
232 setDone(Other);
233 } else {
234 // cerr << "encountered unknown character" << endl;
235 setDone(Bad);
236 }
237 }
238 break;
239 case InString:
240 if (current == stringType) {
241 shift(1);
242 setDone(String);
243 } else if (isLineTerminator() || current == -1) {
244 setDone(Bad);
245 } else if (current == '\\') {
246 state = InEscapeSequence;
247 } else {
248 record16(current);
249 }
250 break;
251 // Escape Sequences inside of strings
252 case InEscapeSequence:
253 if (isOctalDigit(current)) {
254 if (current >= '0' && current <= '3' &&
255 isOctalDigit(next1) && isOctalDigit(next2)) {
256 record16(convertOctal(current, next1, next2));
257 shift(2);
258 state = InString;
259 } else if (isOctalDigit(current) && isOctalDigit(next1)) {
260 record16(convertOctal('0', current, next1));
261 shift(1);
262 state = InString;
263 } else if (isOctalDigit(current)) {
264 record16(convertOctal('0', '0', current));
265 state = InString;
266 } else {
267 setDone(Bad);
268 }
269 } else if (current == 'x')
270 state = InHexEscape;
271 else if (current == 'u')
272 state = InUnicodeEscape;
273 else if (isLineTerminator()) {
274 nextLine();
275 state = InString;
276 } else {
277 record16(singleEscape(static_cast<unsigned short>(current)));
278 state = InString;
279 }
280 break;
281 case InHexEscape:
282 if (isHexDigit(current) && isHexDigit(next1)) {
283 state = InString;
284 record16(convertHex(current, next1));
285 shift(1);
286 } else if (current == stringType) {
287 record16('x');
288 shift(1);
289 setDone(String);
290 } else {
291 record16('x');
292 record16(current);
293 state = InString;
294 }
295 break;
296 case InUnicodeEscape:
297 if (isHexDigit(current) && isHexDigit(next1) && isHexDigit(next2) && isHexDigit(next3)) {
298 record16(convertUnicode(current, next1, next2, next3));
299 shift(3);
300 state = InString;
301 } else if (current == stringType) {
302 record16('u');
303 shift(1);
304 setDone(String);
305 } else {
306 setDone(Bad);
307 }
308 break;
309 case InSingleLineComment:
310 if (isLineTerminator()) {
311 nextLine();
312 terminator = true;
313 if (restrKeyword) {
314 token = ';';
315 setDone(Other);
316 } else
317 state = Start;
318 } else if (current == -1) {
319 setDone(Eof);
320 }
321 break;
322 case InMultiLineComment:
323 if (current == -1) {
324 setDone(Bad);
325 } else if (isLineTerminator()) {
326 nextLine();
327 } else if (current == '*' && next1 == '/') {
328 state = Start;
329 shift(1);
330 }
331 break;
332 case InIdentifierOrKeyword:
333 case InIdentifier:
334 if (isIdentPart(current))
335 record16(current);
336 else if (current == '\\')
337 state = InIdentifierPartUnicodeEscapeStart;
338 else
339 setDone(state == InIdentifierOrKeyword ? IdentifierOrKeyword : Identifier);
340 break;
341 case InNum0:
342 if (current == 'x' || current == 'X') {
343 record8(current);
344 state = InHex;
345 } else if (current == '.') {
346 record8(current);
347 state = InDecimal;
348 } else if (current == 'e' || current == 'E') {
349 record8(current);
350 state = InExponentIndicator;
351 } else if (isOctalDigit(current)) {
352 record8(current);
353 state = InOctal;
354 } else if (isDecimalDigit(current)) {
355 record8(current);
356 state = InDecimal;
357 } else {
358 setDone(Number);
359 }
360 break;
361 case InHex:
362 if (isHexDigit(current)) {
363 record8(current);
364 } else {
365 setDone(Hex);
366 }
367 break;
368 case InOctal:
369 if (isOctalDigit(current)) {
370 record8(current);
371 }
372 else if (isDecimalDigit(current)) {
373 record8(current);
374 state = InDecimal;
375 } else
376 setDone(Octal);
377 break;
378 case InNum:
379 if (isDecimalDigit(current)) {
380 record8(current);
381 } else if (current == '.') {
382 record8(current);
383 state = InDecimal;
384 } else if (current == 'e' || current == 'E') {
385 record8(current);
386 state = InExponentIndicator;
387 } else
388 setDone(Number);
389 break;
390 case InDecimal:
391 if (isDecimalDigit(current)) {
392 record8(current);
393 } else if (current == 'e' || current == 'E') {
394 record8(current);
395 state = InExponentIndicator;
396 } else
397 setDone(Number);
398 break;
399 case InExponentIndicator:
400 if (current == '+' || current == '-') {
401 record8(current);
402 } else if (isDecimalDigit(current)) {
403 record8(current);
404 state = InExponent;
405 } else
406 setDone(Bad);
407 break;
408 case InExponent:
409 if (isDecimalDigit(current)) {
410 record8(current);
411 } else
412 setDone(Number);
413 break;
414 case InIdentifierStartUnicodeEscapeStart:
415 if (current == 'u')
416 state = InIdentifierStartUnicodeEscape;
417 else
418 setDone(Bad);
419 break;
420 case InIdentifierPartUnicodeEscapeStart:
421 if (current == 'u')
422 state = InIdentifierPartUnicodeEscape;
423 else
424 setDone(Bad);
425 break;
426 case InIdentifierStartUnicodeEscape:
427 if (!isHexDigit(current) || !isHexDigit(next1) || !isHexDigit(next2) || !isHexDigit(next3)) {
428 setDone(Bad);
429 break;
430 }
431 token = convertUnicode(current, next1, next2, next3);
432 shift(3);
433 if (!isIdentStart(token)) {
434 setDone(Bad);
435 break;
436 }
437 record16(token);
438 state = InIdentifier;
439 break;
440 case InIdentifierPartUnicodeEscape:
441 if (!isHexDigit(current) || !isHexDigit(next1) || !isHexDigit(next2) || !isHexDigit(next3)) {
442 setDone(Bad);
443 break;
444 }
445 token = convertUnicode(current, next1, next2, next3);
446 shift(3);
447 if (!isIdentPart(token)) {
448 setDone(Bad);
449 break;
450 }
451 record16(token);
452 state = InIdentifier;
453 break;
454 default:
455 ASSERT(!"Unhandled state in switch statement");
456 }
457
458 // move on to the next character
459 if (!done)
460 shift(1);
461 if (state != Start && state != InSingleLineComment)
462 atLineStart = false;
463 }
464
465 // no identifiers allowed directly after numeric literal, e.g. "3in" is bad
466 if ((state == Number || state == Octal || state == Hex) && isIdentStart(current))
467 state = Bad;
468
469 // terminate string
470 m_buffer8.append('\0');
471
472#ifdef KJS_DEBUG_LEX
473 fprintf(stderr, "line: %d ", lineNo());
474 fprintf(stderr, "yytext (%x): ", m_buffer8[0]);
475 fprintf(stderr, "%s ", buffer8.data());
476#endif
477
478 double dval = 0;
479 if (state == Number) {
480 dval = strtod(m_buffer8.data(), 0L);
481 } else if (state == Hex) { // scan hex numbers
482 const char* p = m_buffer8.data() + 2;
483 while (char c = *p++) {
484 dval *= 16;
485 dval += convertHex(c);
486 }
487
488 if (dval >= mantissaOverflowLowerBound)
489 dval = parseIntOverflow(m_buffer8.data() + 2, p - (m_buffer8.data() + 3), 16);
490
491 state = Number;
492 } else if (state == Octal) { // scan octal number
493 const char* p = m_buffer8.data() + 1;
494 while (char c = *p++) {
495 dval *= 8;
496 dval += c - '0';
497 }
498
499 if (dval >= mantissaOverflowLowerBound)
500 dval = parseIntOverflow(m_buffer8.data() + 1, p - (m_buffer8.data() + 2), 8);
501
502 state = Number;
503 }
504
505#ifdef KJS_DEBUG_LEX
506 switch (state) {
507 case Eof:
508 printf("(EOF)\n");
509 break;
510 case Other:
511 printf("(Other)\n");
512 break;
513 case Identifier:
514 printf("(Identifier)/(Keyword)\n");
515 break;
516 case String:
517 printf("(String)\n");
518 break;
519 case Number:
520 printf("(Number)\n");
521 break;
522 default:
523 printf("(unknown)");
524 }
525#endif
526
527 if (state != Identifier)
528 eatNextIdentifier = false;
529
530 restrKeyword = false;
531 delimited = false;
532 llocp->first_line = yylineno; // ???
533 llocp->last_line = yylineno;
534
535 switch (state) {
536 case Eof:
537 token = 0;
538 break;
539 case Other:
540 if (token == '}' || token == ';')
541 delimited = true;
542 break;
543 case Identifier:
544 // Apply anonymous-function hack below (eat the identifier).
545 if (eatNextIdentifier) {
546 eatNextIdentifier = false;
547 token = lex(lvalp, llocp);
548 break;
549 }
550 lvalp->ident = makeIdentifier(m_buffer16);
551 token = IDENT;
552 break;
553 case IdentifierOrKeyword: {
554 lvalp->ident = makeIdentifier(m_buffer16);
555 const HashEntry* entry = mainTable.entry(m_globalData, *lvalp->ident);
556 if (!entry) {
557 // Lookup for keyword failed, means this is an identifier.
558 token = IDENT;
559 break;
560 }
561 token = entry->integerValue;
562 // Hack for "f = function somename() { ... }"; too hard to get into the grammar.
563 eatNextIdentifier = token == FUNCTION && lastToken == '=';
564 if (token == CONTINUE || token == BREAK || token == RETURN || token == THROW)
565 restrKeyword = true;
566 break;
567 }
568 case String:
569 lvalp->string = makeUString(m_buffer16);
570 token = STRING;
571 break;
572 case Number:
573 lvalp->doubleValue = dval;
574 token = NUMBER;
575 break;
576 case Bad:
577#ifdef KJS_DEBUG_LEX
578 fprintf(stderr, "yylex: ERROR.\n");
579#endif
580 error = true;
581 return -1;
582 default:
583 ASSERT(!"unhandled numeration value in switch");
584 error = true;
585 return -1;
586 }
587 lastToken = token;
588 return token;
589}
590
591bool Lexer::isWhiteSpace() const
592{
593 return current == '\t' || current == 0x0b || current == 0x0c || isSeparatorSpace(current);
594}
595
596bool Lexer::isLineTerminator()
597{
598 bool cr = (current == '\r');
599 bool lf = (current == '\n');
600 if (cr)
601 skipLF = true;
602 else if (lf)
603 skipCR = true;
604 return cr || lf || current == 0x2028 || current == 0x2029;
605}
606
607bool Lexer::isIdentStart(int c)
608{
609 return (category(c) & (Letter_Uppercase | Letter_Lowercase | Letter_Titlecase | Letter_Modifier | Letter_Other))
610 || c == '$' || c == '_';
611}
612
613bool Lexer::isIdentPart(int c)
614{
615 return (category(c) & (Letter_Uppercase | Letter_Lowercase | Letter_Titlecase | Letter_Modifier | Letter_Other
616 | Mark_NonSpacing | Mark_SpacingCombining | Number_DecimalDigit | Punctuation_Connector))
617 || c == '$' || c == '_';
618}
619
620static bool isDecimalDigit(int c)
621{
622 return (c >= '0' && c <= '9');
623}
624
625bool Lexer::isHexDigit(int c)
626{
627 return (c >= '0' && c <= '9' ||
628 c >= 'a' && c <= 'f' ||
629 c >= 'A' && c <= 'F');
630}
631
632bool Lexer::isOctalDigit(int c)
633{
634 return (c >= '0' && c <= '7');
635}
636
637int Lexer::matchPunctuator(int& charPos, int c1, int c2, int c3, int c4)
638{
639 if (c1 == '>' && c2 == '>' && c3 == '>' && c4 == '=') {
640 shift(4);
641 return URSHIFTEQUAL;
642 } else if (c1 == '=' && c2 == '=' && c3 == '=') {
643 shift(3);
644 return STREQ;
645 } else if (c1 == '!' && c2 == '=' && c3 == '=') {
646 shift(3);
647 return STRNEQ;
648 } else if (c1 == '>' && c2 == '>' && c3 == '>') {
649 shift(3);
650 return URSHIFT;
651 } else if (c1 == '<' && c2 == '<' && c3 == '=') {
652 shift(3);
653 return LSHIFTEQUAL;
654 } else if (c1 == '>' && c2 == '>' && c3 == '=') {
655 shift(3);
656 return RSHIFTEQUAL;
657 } else if (c1 == '<' && c2 == '=') {
658 shift(2);
659 return LE;
660 } else if (c1 == '>' && c2 == '=') {
661 shift(2);
662 return GE;
663 } else if (c1 == '!' && c2 == '=') {
664 shift(2);
665 return NE;
666 } else if (c1 == '+' && c2 == '+') {
667 shift(2);
668 if (terminator)
669 return AUTOPLUSPLUS;
670 else
671 return PLUSPLUS;
672 } else if (c1 == '-' && c2 == '-') {
673 shift(2);
674 if (terminator)
675 return AUTOMINUSMINUS;
676 else
677 return MINUSMINUS;
678 } else if (c1 == '=' && c2 == '=') {
679 shift(2);
680 return EQEQ;
681 } else if (c1 == '+' && c2 == '=') {
682 shift(2);
683 return PLUSEQUAL;
684 } else if (c1 == '-' && c2 == '=') {
685 shift(2);
686 return MINUSEQUAL;
687 } else if (c1 == '*' && c2 == '=') {
688 shift(2);
689 return MULTEQUAL;
690 } else if (c1 == '/' && c2 == '=') {
691 shift(2);
692 return DIVEQUAL;
693 } else if (c1 == '&' && c2 == '=') {
694 shift(2);
695 return ANDEQUAL;
696 } else if (c1 == '^' && c2 == '=') {
697 shift(2);
698 return XOREQUAL;
699 } else if (c1 == '%' && c2 == '=') {
700 shift(2);
701 return MODEQUAL;
702 } else if (c1 == '|' && c2 == '=') {
703 shift(2);
704 return OREQUAL;
705 } else if (c1 == '<' && c2 == '<') {
706 shift(2);
707 return LSHIFT;
708 } else if (c1 == '>' && c2 == '>') {
709 shift(2);
710 return RSHIFT;
711 } else if (c1 == '&' && c2 == '&') {
712 shift(2);
713 return AND;
714 } else if (c1 == '|' && c2 == '|') {
715 shift(2);
716 return OR;
717 }
718
719 switch(c1) {
720 case '=':
721 case '>':
722 case '<':
723 case ',':
724 case '!':
725 case '~':
726 case '?':
727 case ':':
728 case '.':
729 case '+':
730 case '-':
731 case '*':
732 case '/':
733 case '&':
734 case '|':
735 case '^':
736 case '%':
737 case '(':
738 case ')':
739 case '[':
740 case ']':
741 case ';':
742 shift(1);
743 return static_cast<int>(c1);
744 case '{':
745 charPos = pos - 4;
746 shift(1);
747 return OPENBRACE;
748 case '}':
749 charPos = pos - 4;
750 shift(1);
751 return CLOSEBRACE;
752 default:
753 return -1;
754 }
755}
756
757unsigned short Lexer::singleEscape(unsigned short c)
758{
759 switch(c) {
760 case 'b':
761 return 0x08;
762 case 't':
763 return 0x09;
764 case 'n':
765 return 0x0A;
766 case 'v':
767 return 0x0B;
768 case 'f':
769 return 0x0C;
770 case 'r':
771 return 0x0D;
772 case '"':
773 return 0x22;
774 case '\'':
775 return 0x27;
776 case '\\':
777 return 0x5C;
778 default:
779 return c;
780 }
781}
782
783unsigned short Lexer::convertOctal(int c1, int c2, int c3)
784{
785 return static_cast<unsigned short>((c1 - '0') * 64 + (c2 - '0') * 8 + c3 - '0');
786}
787
788unsigned char Lexer::convertHex(int c)
789{
790 if (c >= '0' && c <= '9')
791 return static_cast<unsigned char>(c - '0');
792 if (c >= 'a' && c <= 'f')
793 return static_cast<unsigned char>(c - 'a' + 10);
794 return static_cast<unsigned char>(c - 'A' + 10);
795}
796
797unsigned char Lexer::convertHex(int c1, int c2)
798{
799 return ((convertHex(c1) << 4) + convertHex(c2));
800}
801
802UChar Lexer::convertUnicode(int c1, int c2, int c3, int c4)
803{
804 unsigned char highByte = (convertHex(c1) << 4) + convertHex(c2);
805 unsigned char lowByte = (convertHex(c3) << 4) + convertHex(c4);
806 return (highByte << 8 | lowByte);
807}
808
809void Lexer::record8(int c)
810{
811 ASSERT(c >= 0);
812 ASSERT(c <= 0xff);
813 m_buffer8.append(static_cast<char>(c));
814}
815
816void Lexer::record16(int c)
817{
818 ASSERT(c >= 0);
819 ASSERT(c <= USHRT_MAX);
820 record16(UChar(static_cast<unsigned short>(c)));
821}
822
823void Lexer::record16(UChar c)
824{
825 m_buffer16.append(c);
826}
827
828bool Lexer::scanRegExp()
829{
830 m_buffer16.clear();
831 bool lastWasEscape = false;
832 bool inBrackets = false;
833
834 while (1) {
835 if (isLineTerminator() || current == -1)
836 return false;
837 else if (current != '/' || lastWasEscape == true || inBrackets == true)
838 {
839 // keep track of '[' and ']'
840 if (!lastWasEscape) {
841 if ( current == '[' && !inBrackets )
842 inBrackets = true;
843 if ( current == ']' && inBrackets )
844 inBrackets = false;
845 }
846 record16(current);
847 lastWasEscape =
848 !lastWasEscape && (current == '\\');
849 } else { // end of regexp
850 m_pattern = UString(m_buffer16);
851 m_buffer16.clear();
852 shift(1);
853 break;
854 }
855 shift(1);
856 }
857
858 while (isIdentPart(current)) {
859 record16(current);
860 shift(1);
861 }
862 m_flags = UString(m_buffer16);
863
864 return true;
865}
866
867void Lexer::clear()
868{
869 deleteAllValues(m_strings);
870 Vector<UString*> newStrings;
871 newStrings.reserveCapacity(initialStringTableCapacity);
872 m_strings.swap(newStrings);
873
874 deleteAllValues(m_identifiers);
875 Vector<KJS::Identifier*> newIdentifiers;
876 newIdentifiers.reserveCapacity(initialStringTableCapacity);
877 m_identifiers.swap(newIdentifiers);
878
879 Vector<char> newBuffer8;
880 newBuffer8.reserveCapacity(initialReadBufferCapacity);
881 m_buffer8.swap(newBuffer8);
882
883 Vector<UChar> newBuffer16;
884 newBuffer16.reserveCapacity(initialReadBufferCapacity);
885 m_buffer16.swap(newBuffer16);
886
887 m_pattern = 0;
888 m_flags = 0;
889}
890
891Identifier* Lexer::makeIdentifier(const Vector<UChar>& buffer)
892{
893 KJS::Identifier* identifier = new KJS::Identifier(m_globalData, buffer.data(), buffer.size());
894 m_identifiers.append(identifier);
895 return identifier;
896}
897
898UString* Lexer::makeUString(const Vector<UChar>& buffer)
899{
900 UString* string = new UString(buffer);
901 m_strings.append(string);
902 return string;
903}
904
905} // namespace KJS
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