1 /* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
2 *
3 * ***** BEGIN LICENSE BLOCK *****
4 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
5 *
6 * The contents of this file are subject to the Mozilla Public License Version
7 * 1.1 (the "License"); you may not use this file except in compliance with
8 * the License. You may obtain a copy of the License at
9 * http://www.mozilla.org/MPL/
10 *
11 * Software distributed under the License is distributed on an "AS IS" basis,
12 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
13 * for the specific language governing rights and limitations under the
14 * License.
15 *
16 * The Original Code is Mozilla Communicator client code, released
17 * March 31, 1998.
18 *
19 * The Initial Developer of the Original Code is
20 * Netscape Communications Corporation.
21 * Portions created by the Initial Developer are Copyright (C) 1998
22 * the Initial Developer. All Rights Reserved.
23 *
24 * Contributor(s):
25 *
26 * Alternatively, the contents of this file may be used under the terms of
27 * either of the GNU General Public License Version 2 or later (the "GPL"),
28 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
29 * in which case the provisions of the GPL or the LGPL are applicable instead
30 * of those above. If you wish to allow use of your version of this file only
31 * under the terms of either the GPL or the LGPL, and not to allow others to
32 * use your version of this file under the terms of the MPL, indicate your
33 * decision by deleting the provisions above and replace them with the notice
34 * and other provisions required by the GPL or the LGPL. If you do not delete
35 * the provisions above, a recipient may use your version of this file under
36 * the terms of any one of the MPL, the GPL or the LGPL.
37 *
38 * ***** END LICENSE BLOCK ***** */
40 /*
41 * JS lexical scanner.
42 */
43 #include "jsstddef.h"
44 #include <stdio.h> /* first to avoid trouble on some systems */
45 #include <errno.h>
46 #include <limits.h>
47 #include <math.h>
48 #ifdef HAVE_MEMORY_H
49 #include <memory.h>
50 #endif
51 #include <stdarg.h>
52 #include <stdlib.h>
53 #include <string.h>
54 #include "jstypes.h"
55 #include "jsarena.h" /* Added by JSIFY */
56 #include "jsutil.h" /* Added by JSIFY */
57 #include "jsdtoa.h"
58 #include "jsprf.h"
59 #include "jsapi.h"
60 #include "jsatom.h"
61 #include "jscntxt.h"
62 #include "jsconfig.h"
63 #include "jsemit.h"
64 #include "jsexn.h"
65 #include "jsnum.h"
66 #include "jsopcode.h"
67 #include "jsregexp.h"
68 #include "jsscan.h"
70 #define RESERVE_JAVA_KEYWORDS
71 #define RESERVE_ECMA_KEYWORDS
73 static struct keyword {
74 const char *name;
75 JSTokenType tokentype; /* JSTokenType */
76 JSOp op; /* JSOp */
77 JSVersion version; /* JSVersion */
78 } keywords[] = {
79 {"break", TOK_BREAK, JSOP_NOP, JSVERSION_DEFAULT},
80 {"case", TOK_CASE, JSOP_NOP, JSVERSION_DEFAULT},
81 {"continue", TOK_CONTINUE, JSOP_NOP, JSVERSION_DEFAULT},
82 {"default", TOK_DEFAULT, JSOP_NOP, JSVERSION_DEFAULT},
83 {js_delete_str, TOK_DELETE, JSOP_NOP, JSVERSION_DEFAULT},
84 {"do", TOK_DO, JSOP_NOP, JSVERSION_DEFAULT},
85 {"else", TOK_ELSE, JSOP_NOP, JSVERSION_DEFAULT},
86 {"export", TOK_EXPORT, JSOP_NOP, JSVERSION_1_2},
87 {js_false_str, TOK_PRIMARY, JSOP_FALSE, JSVERSION_DEFAULT},
88 {"for", TOK_FOR, JSOP_NOP, JSVERSION_DEFAULT},
89 {js_function_str, TOK_FUNCTION, JSOP_NOP, JSVERSION_DEFAULT},
90 {"if", TOK_IF, JSOP_NOP, JSVERSION_DEFAULT},
91 {js_in_str, TOK_IN, JSOP_IN, JSVERSION_DEFAULT},
92 {js_new_str, TOK_NEW, JSOP_NEW, JSVERSION_DEFAULT},
93 {js_null_str, TOK_PRIMARY, JSOP_NULL, JSVERSION_DEFAULT},
94 {"return", TOK_RETURN, JSOP_NOP, JSVERSION_DEFAULT},
95 {"switch", TOK_SWITCH, JSOP_NOP, JSVERSION_DEFAULT},
96 {js_this_str, TOK_PRIMARY, JSOP_THIS, JSVERSION_DEFAULT},
97 {js_true_str, TOK_PRIMARY, JSOP_TRUE, JSVERSION_DEFAULT},
98 {js_typeof_str, TOK_UNARYOP, JSOP_TYPEOF,JSVERSION_DEFAULT},
99 {"var", TOK_VAR, JSOP_DEFVAR,JSVERSION_DEFAULT},
100 {js_void_str, TOK_UNARYOP, JSOP_VOID, JSVERSION_DEFAULT},
101 {"while", TOK_WHILE, JSOP_NOP, JSVERSION_DEFAULT},
102 {"with", TOK_WITH, JSOP_NOP, JSVERSION_DEFAULT},
104 #if JS_HAS_CONST
105 {js_const_str, TOK_VAR, JSOP_DEFCONST,JSVERSION_DEFAULT},
106 #else
107 {js_const_str, TOK_RESERVED, JSOP_NOP, JSVERSION_DEFAULT},
108 #endif
110 #if JS_HAS_EXCEPTIONS
111 {"try", TOK_TRY, JSOP_NOP, JSVERSION_DEFAULT},
112 {"catch", TOK_CATCH, JSOP_NOP, JSVERSION_DEFAULT},
113 {"finally", TOK_FINALLY, JSOP_NOP, JSVERSION_DEFAULT},
114 {"throw", TOK_THROW, JSOP_NOP, JSVERSION_DEFAULT},
115 #else
116 {"try", TOK_RESERVED, JSOP_NOP, JSVERSION_DEFAULT},
117 {"catch", TOK_RESERVED, JSOP_NOP, JSVERSION_DEFAULT},
118 {"finally", TOK_RESERVED, JSOP_NOP, JSVERSION_DEFAULT},
119 {"throw", TOK_RESERVED, JSOP_NOP, JSVERSION_DEFAULT},
120 #endif
122 #if JS_HAS_INSTANCEOF
123 {js_instanceof_str, TOK_INSTANCEOF, JSOP_INSTANCEOF,JSVERSION_1_4},
124 #else
125 {js_instanceof_str, TOK_RESERVED, JSOP_NOP, JSVERSION_1_4},
126 #endif
128 #ifdef RESERVE_JAVA_KEYWORDS
129 {"abstract", TOK_RESERVED, JSOP_NOP, JSVERSION_DEFAULT},
130 {"boolean", TOK_RESERVED, JSOP_NOP, JSVERSION_DEFAULT},
131 {"byte", TOK_RESERVED, JSOP_NOP, JSVERSION_DEFAULT},
132 {"char", TOK_RESERVED, JSOP_NOP, JSVERSION_DEFAULT},
133 {"class", TOK_RESERVED, JSOP_NOP, JSVERSION_DEFAULT},
134 {"double", TOK_RESERVED, JSOP_NOP, JSVERSION_DEFAULT},
135 {"extends", TOK_RESERVED, JSOP_NOP, JSVERSION_DEFAULT},
136 {"final", TOK_RESERVED, JSOP_NOP, JSVERSION_DEFAULT},
137 {"float", TOK_RESERVED, JSOP_NOP, JSVERSION_DEFAULT},
138 {"goto", TOK_RESERVED, JSOP_NOP, JSVERSION_DEFAULT},
139 {"implements", TOK_RESERVED, JSOP_NOP, JSVERSION_DEFAULT},
140 {"import", TOK_IMPORT, JSOP_NOP, JSVERSION_DEFAULT},
141 {"int", TOK_RESERVED, JSOP_NOP, JSVERSION_DEFAULT},
142 {"interface", TOK_RESERVED, JSOP_NOP, JSVERSION_DEFAULT},
143 {"long", TOK_RESERVED, JSOP_NOP, JSVERSION_DEFAULT},
144 {"native", TOK_RESERVED, JSOP_NOP, JSVERSION_DEFAULT},
145 {"package", TOK_RESERVED, JSOP_NOP, JSVERSION_DEFAULT},
146 {"private", TOK_RESERVED, JSOP_NOP, JSVERSION_DEFAULT},
147 {"protected", TOK_RESERVED, JSOP_NOP, JSVERSION_DEFAULT},
148 {"public", TOK_RESERVED, JSOP_NOP, JSVERSION_DEFAULT},
149 {"short", TOK_RESERVED, JSOP_NOP, JSVERSION_DEFAULT},
150 {"static", TOK_RESERVED, JSOP_NOP, JSVERSION_DEFAULT},
151 {"super", TOK_RESERVED, JSOP_NOP, JSVERSION_DEFAULT},
152 {"synchronized", TOK_RESERVED, JSOP_NOP, JSVERSION_DEFAULT},
153 {"throws", TOK_RESERVED, JSOP_NOP, JSVERSION_DEFAULT},
154 {"transient", TOK_RESERVED, JSOP_NOP, JSVERSION_DEFAULT},
155 {"volatile", TOK_RESERVED, JSOP_NOP, JSVERSION_DEFAULT},
156 #endif
158 #ifdef RESERVE_ECMA_KEYWORDS
159 {"enum", TOK_RESERVED, JSOP_NOP, JSVERSION_1_3},
160 #endif
162 #if JS_HAS_DEBUGGER_KEYWORD
163 {"debugger", TOK_DEBUGGER, JSOP_NOP, JSVERSION_1_3},
164 #elif defined(RESERVE_ECMA_KEYWORDS)
165 {"debugger", TOK_RESERVED, JSOP_NOP, JSVERSION_1_3},
166 #endif
167 {0, TOK_EOF, JSOP_NOP, JSVERSION_DEFAULT}
168 };
170 JSBool
171 js_InitScanner(JSContext *cx)
172 {
173 struct keyword *kw;
174 JSAtom *atom;
176 for (kw = keywords; kw->name; kw++) {
177 atom = js_Atomize(cx, kw->name, strlen(kw->name), ATOM_PINNED);
178 if (!atom)
179 return JS_FALSE;
180 ATOM_SET_KEYWORD(atom, kw);
181 }
182 return JS_TRUE;
183 }
185 JS_FRIEND_API(void)
186 js_MapKeywords(void (*mapfun)(const char *))
187 {
188 struct keyword *kw;
190 for (kw = keywords; kw->name; kw++)
191 mapfun(kw->name);
192 }
194 JSTokenStream *
195 js_NewTokenStream(JSContext *cx, const jschar *base, size_t length,
196 const char *filename, uintN lineno,
197 JSPrincipals *principals)
198 {
199 JSTokenStream *ts;
201 ts = js_NewBufferTokenStream(cx, base, length);
202 if (!ts)
203 return NULL;
204 ts->filename = filename;
205 ts->lineno = lineno;
206 if (principals)
207 JSPRINCIPALS_HOLD(cx, principals);
208 ts->principals = principals;
209 return ts;
210 }
212 JS_FRIEND_API(JSTokenStream *)
213 js_NewBufferTokenStream(JSContext *cx, const jschar *base, size_t length)
214 {
215 size_t nb;
216 JSTokenStream *ts;
218 nb = sizeof(JSTokenStream) + JS_LINE_LIMIT * sizeof(jschar);
219 JS_ARENA_ALLOCATE_CAST(ts, JSTokenStream *, &cx->tempPool, nb);
220 if (!ts) {
221 JS_ReportOutOfMemory(cx);
222 return NULL;
223 }
224 memset(ts, 0, nb);
225 ts->lineno = 1;
226 ts->linebuf.base = ts->linebuf.limit = ts->linebuf.ptr = (jschar *)(ts + 1);
227 ts->userbuf.base = (jschar *)base;
228 ts->userbuf.limit = (jschar *)base + length;
229 ts->userbuf.ptr = (jschar *)base;
230 ts->listener = cx->runtime->sourceHandler;
231 ts->listenerData = cx->runtime->sourceHandlerData;
232 return ts;
233 }
235 JS_FRIEND_API(JSTokenStream *)
236 js_NewFileTokenStream(JSContext *cx, const char *filename, FILE *defaultfp)
237 {
238 jschar *base;
239 JSTokenStream *ts;
240 FILE *file;
242 JS_ARENA_ALLOCATE_CAST(base, jschar *, &cx->tempPool,
243 JS_LINE_LIMIT * sizeof(jschar));
244 if (!base)
245 return NULL;
246 ts = js_NewBufferTokenStream(cx, base, JS_LINE_LIMIT);
247 if (!ts)
248 return NULL;
249 if (!filename || strcmp(filename, "-") == 0) {
250 file = defaultfp;
251 } else {
252 file = fopen(filename, "r");
253 if (!file) {
254 JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_CANT_OPEN,
255 filename, "No such file or directory");
256 return NULL;
257 }
258 }
259 ts->userbuf.ptr = ts->userbuf.limit;
260 ts->file = file;
261 ts->filename = filename;
262 return ts;
263 }
265 JS_FRIEND_API(JSBool)
266 js_CloseTokenStream(JSContext *cx, JSTokenStream *ts)
267 {
268 if (ts->flags & TSF_OWNFILENAME)
269 JS_free(cx, (void *) ts->filename);
270 if (ts->principals)
271 JSPRINCIPALS_DROP(cx, ts->principals);
272 return !ts->file || fclose(ts->file) == 0;
273 }
275 static int
276 my_fgets(char *buf, int size, FILE *file)
277 {
278 int n, i, c;
279 JSBool crflag;
281 n = size - 1;
282 if (n < 0)
283 return -1;
285 crflag = JS_FALSE;
286 for (i = 0; i < n && (c = getc(file)) != EOF; i++) {
287 buf[i] = c;
288 if (c == '\n') { /* any \n ends a line */
289 i++; /* keep the \n; we know there is room for \0 */
290 break;
291 }
292 if (crflag) { /* \r not followed by \n ends line at the \r */
293 ungetc(c, file);
294 break; /* and overwrite c in buf with \0 */
295 }
296 crflag = (c == '\r');
297 }
299 buf[i] = '\0';
300 return i;
301 }
303 static int32
304 GetChar(JSTokenStream *ts)
305 {
306 int32 c;
307 ptrdiff_t i, j, len, olen;
308 JSBool crflag;
309 char cbuf[JS_LINE_LIMIT];
310 jschar *ubuf, *nl;
312 if (ts->ungetpos != 0) {
313 c = ts->ungetbuf[--ts->ungetpos];
314 } else {
315 do {
316 if (ts->linebuf.ptr == ts->linebuf.limit) {
317 len = PTRDIFF(ts->userbuf.limit, ts->userbuf.ptr, jschar);
318 if (len <= 0) {
319 if (!ts->file) {
320 ts->flags |= TSF_EOF;
321 return EOF;
322 }
324 /* Fill ts->userbuf so that \r and \r\n convert to \n. */
325 crflag = (ts->flags & TSF_CRFLAG) != 0;
326 len = my_fgets(cbuf, JS_LINE_LIMIT - crflag, ts->file);
327 if (len <= 0) {
328 ts->flags |= TSF_EOF;
329 return EOF;
330 }
331 olen = len;
332 ubuf = ts->userbuf.base;
333 i = 0;
334 if (crflag) {
335 ts->flags &= ~TSF_CRFLAG;
336 if (cbuf[0] != '\n') {
337 ubuf[i++] = '\n';
338 len++;
339 ts->linepos--;
340 }
341 }
342 for (j = 0; i < len; i++, j++)
343 ubuf[i] = (jschar) (unsigned char) cbuf[j];
344 ts->userbuf.limit = ubuf + len;
345 ts->userbuf.ptr = ubuf;
346 }
347 if (ts->listener) {
348 ts->listener(ts->filename, ts->lineno, ts->userbuf.ptr, len,
349 &ts->listenerTSData, ts->listenerData);
350 }
352 nl = ts->saveEOL;
353 if (!nl) {
354 /*
355 * Any one of \n, \r, or \r\n ends a line (the longest
356 * match wins). Also allow the Unicode line and paragraph
357 * separators.
358 */
359 for (nl = ts->userbuf.ptr; nl < ts->userbuf.limit; nl++) {
360 /*
361 * Try to prevent value-testing on most characters by
362 * filtering out characters that aren't 000x or 202x.
363 */
364 if ((*nl & 0xDFD0) == 0) {
365 if (*nl == '\n')
366 break;
367 if (*nl == '\r') {
368 if (nl + 1 < ts->userbuf.limit && nl[1] == '\n')
369 nl++;
370 break;
371 }
372 if (*nl == LINE_SEPARATOR || *nl == PARA_SEPARATOR)
373 break;
374 }
375 }
376 }
378 /*
379 * If there was a line terminator, copy thru it into linebuf.
380 * Else copy JS_LINE_LIMIT-1 bytes into linebuf.
381 */
382 if (nl < ts->userbuf.limit)
383 len = PTRDIFF(nl, ts->userbuf.ptr, jschar) + 1;
384 if (len >= JS_LINE_LIMIT) {
385 len = JS_LINE_LIMIT - 1;
386 ts->saveEOL = nl;
387 } else {
388 ts->saveEOL = NULL;
389 }
390 js_strncpy(ts->linebuf.base, ts->userbuf.ptr, len);
391 ts->userbuf.ptr += len;
392 olen = len;
394 /*
395 * Make sure linebuf contains \n for EOL (don't do this in
396 * userbuf because the user's string might be readonly).
397 */
398 if (nl < ts->userbuf.limit) {
399 if (*nl == '\r') {
400 if (ts->linebuf.base[len-1] == '\r') {
401 /*
402 * Does the line segment end in \r? We must check
403 * for a \n at the front of the next segment before
404 * storing a \n into linebuf. This case matters
405 * only when we're reading from a file.
406 */
407 if (nl + 1 == ts->userbuf.limit && ts->file) {
408 len--;
409 ts->flags |= TSF_CRFLAG; /* clear NLFLAG? */
410 if (len == 0) {
411 /*
412 * This can happen when a segment ends in
413 * \r\r. Start over. ptr == limit in this
414 * case, so we'll fall into buffer-filling
415 * code.
416 */
417 return GetChar(ts);
418 }
419 } else {
420 ts->linebuf.base[len-1] = '\n';
421 }
422 }
423 } else if (*nl == '\n') {
424 if (nl > ts->userbuf.base &&
425 nl[-1] == '\r' &&
426 ts->linebuf.base[len-2] == '\r') {
427 len--;
428 JS_ASSERT(ts->linebuf.base[len] == '\n');
429 ts->linebuf.base[len-1] = '\n';
430 }
431 } else if (*nl == LINE_SEPARATOR || *nl == PARA_SEPARATOR) {
432 ts->linebuf.base[len-1] = '\n';
433 }
434 }
436 /* Reset linebuf based on adjusted segment length. */
437 ts->linebuf.limit = ts->linebuf.base + len;
438 ts->linebuf.ptr = ts->linebuf.base;
440 /* Update position of linebuf within physical userbuf line. */
441 if (!(ts->flags & TSF_NLFLAG))
442 ts->linepos += ts->linelen;
443 else
444 ts->linepos = 0;
445 if (ts->linebuf.limit[-1] == '\n')
446 ts->flags |= TSF_NLFLAG;
447 else
448 ts->flags &= ~TSF_NLFLAG;
450 /* Update linelen from original segment length. */
451 ts->linelen = olen;
452 }
453 c = *ts->linebuf.ptr++;
454 } while (JS_ISFORMAT(c));
455 }
456 if (c == '\n')
457 ts->lineno++;
458 return c;
459 }
461 static void
462 UngetChar(JSTokenStream *ts, int32 c)
463 {
464 if (c == EOF)
465 return;
466 JS_ASSERT(ts->ungetpos < sizeof ts->ungetbuf / sizeof ts->ungetbuf[0]);
467 if (c == '\n')
468 ts->lineno--;
469 ts->ungetbuf[ts->ungetpos++] = (jschar)c;
470 }
472 static int32
473 PeekChar(JSTokenStream *ts)
474 {
475 int32 c;
477 c = GetChar(ts);
478 UngetChar(ts, c);
479 return c;
480 }
482 static JSBool
483 PeekChars(JSTokenStream *ts, intN n, jschar *cp)
484 {
485 intN i, j;
486 int32 c;
488 for (i = 0; i < n; i++) {
489 c = GetChar(ts);
490 if (c == EOF)
491 break;
492 cp[i] = (jschar)c;
493 }
494 for (j = i - 1; j >= 0; j--)
495 UngetChar(ts, cp[j]);
496 return i == n;
497 }
499 static void
500 SkipChars(JSTokenStream *ts, intN n)
501 {
502 while (--n >= 0)
503 GetChar(ts);
504 }
506 static JSBool
507 MatchChar(JSTokenStream *ts, int32 expect)
508 {
509 int32 c;
511 c = GetChar(ts);
512 if (c == expect)
513 return JS_TRUE;
514 UngetChar(ts, c);
515 return JS_FALSE;
516 }
518 JSBool
519 js_ReportCompileErrorNumber(JSContext *cx, JSTokenStream *ts,
520 JSCodeGenerator *cg, uintN flags,
521 const uintN errorNumber, ...)
522 {
523 va_list ap;
524 JSErrorReporter onError;
525 JSErrorReport report;
526 jschar *tokenptr;
527 JSString *linestr = NULL;
528 char *message;
529 JSBool warning;
531 if ((flags & JSREPORT_STRICT) && !JS_HAS_STRICT_OPTION(cx))
532 return JS_TRUE;
534 memset(&report, 0, sizeof (struct JSErrorReport));
535 report.flags = flags;
536 report.errorNumber = errorNumber;
537 message = NULL;
539 va_start(ap, errorNumber);
540 if (!js_ExpandErrorArguments(cx, js_GetErrorMessage, NULL,
541 errorNumber, &message, &report, &warning,
542 JS_TRUE, ap)) {
543 return JS_FALSE;
544 }
545 va_end(ap);
547 js_AddRoot(cx, &linestr, "error line buffer");
549 JS_ASSERT(!ts || ts->linebuf.limit < ts->linebuf.base + JS_LINE_LIMIT);
550 onError = cx->errorReporter;
551 if (onError) {
552 /*
553 * We are typically called with non-null ts and null cg from jsparse.c.
554 * We can be called with null ts from the regexp compilation functions.
555 * The code generator (jsemit.c) may pass null ts and non-null cg.
556 */
557 if (ts) {
558 report.filename = ts->filename;
559 report.lineno = ts->lineno;
560 linestr = js_NewStringCopyN(cx, ts->linebuf.base,
561 ts->linebuf.limit - ts->linebuf.base,
562 0);
563 report.linebuf = linestr
564 ? JS_GetStringBytes(linestr)
565 : NULL;
566 tokenptr =
567 ts->tokens[(ts->cursor + ts->lookahead) & NTOKENS_MASK].ptr;
568 report.tokenptr = linestr
569 ? report.linebuf + (tokenptr - ts->linebuf.base)
570 : NULL;
571 report.uclinebuf = linestr
572 ? JS_GetStringChars(linestr)
573 : NULL;
574 report.uctokenptr = linestr
575 ? report.uclinebuf + (tokenptr - ts->linebuf.base)
576 : NULL;
577 } else if (cg) {
578 report.filename = cg->filename;
579 report.lineno = CG_CURRENT_LINE(cg);
580 }
582 #if JS_HAS_ERROR_EXCEPTIONS
583 /*
584 * If there's a runtime exception type associated with this error
585 * number, set that as the pending exception. For errors occuring at
586 * compile time, this is very likely to be a JSEXN_SYNTAXERR.
587 *
588 * If an exception is thrown but not caught, the JSREPORT_EXCEPTION
589 * flag will be set in report.flags. Proper behavior for an error
590 * reporter is to ignore a report with this flag for all but top-level
591 * compilation errors. The exception will remain pending, and so long
592 * as the non-top-level "load", "eval", or "compile" native function
593 * returns false, the top-level reporter will eventually receive the
594 * uncaught exception report.
595 *
596 * XXX it'd probably be best if there was only one call to this
597 * function, but there seem to be two error reporter call points.
598 */
600 /*
601 * Only try to raise an exception if there isn't one already set -
602 * otherwise the exception will describe only the last compile error,
603 * which is likely spurious.
604 */
605 if (!(ts && (ts->flags & TSF_ERROR)))
606 if (js_ErrorToException(cx, message, &report))
607 onError = NULL;
609 /*
610 * Suppress any compiletime errors that don't occur at the top level.
611 * This may still fail, as interplevel may be zero in contexts where we
612 * don't really want to call the error reporter, as when js is called
613 * by other code which could catch the error.
614 */
615 if (cx->interpLevel != 0)
616 onError = NULL;
617 #endif
618 if (cx->runtime->debugErrorHook && onError) {
619 JSDebugErrorHook hook = cx->runtime->debugErrorHook;
620 /* test local in case debugErrorHook changed on another thread */
621 if (hook && !hook(cx, message, &report,
622 cx->runtime->debugErrorHookData)) {
623 onError = NULL;
624 }
625 }
626 if (onError)
627 (*onError)(cx, message, &report);
628 }
629 if (message)
630 JS_free(cx, message);
631 if (report.messageArgs) {
632 int i = 0;
633 while (report.messageArgs[i])
634 JS_free(cx, (void *)report.messageArgs[i++]);
635 JS_free(cx, (void *)report.messageArgs);
636 }
637 if (report.ucmessage)
638 JS_free(cx, (void *)report.ucmessage);
640 js_RemoveRoot(cx->runtime, &linestr);
642 if (ts && !JSREPORT_IS_WARNING(flags)) {
643 /* Set the error flag to suppress spurious reports. */
644 ts->flags |= TSF_ERROR;
645 }
646 return warning;
647 }
649 JSTokenType
650 js_PeekToken(JSContext *cx, JSTokenStream *ts)
651 {
652 JSTokenType tt;
654 if (ts->lookahead != 0) {
655 tt = ts->tokens[(ts->cursor + ts->lookahead) & NTOKENS_MASK].type;
656 } else {
657 tt = js_GetToken(cx, ts);
658 js_UngetToken(ts);
659 }
660 return tt;
661 }
663 JSTokenType
664 js_PeekTokenSameLine(JSContext *cx, JSTokenStream *ts)
665 {
666 JSTokenType tt;
668 JS_ASSERT(ts->lookahead == 0 ||
669 ON_CURRENT_LINE(ts, CURRENT_TOKEN(ts).pos));
670 ts->flags |= TSF_NEWLINES;
671 tt = js_PeekToken(cx, ts);
672 ts->flags &= ~TSF_NEWLINES;
673 return tt;
674 }
676 #define TBMIN 64
678 static JSBool
679 GrowTokenBuf(JSContext *cx, JSTokenBuf *tb)
680 {
681 jschar *base;
682 ptrdiff_t offset, length;
683 size_t tbsize;
684 JSArenaPool *pool;
686 base = tb->base;
687 offset = PTRDIFF(tb->ptr, base, jschar);
688 pool = &cx->tempPool;
689 if (!base) {
690 tbsize = TBMIN * sizeof(jschar);
691 length = TBMIN;
692 JS_ARENA_ALLOCATE_CAST(base, jschar *, pool, tbsize);
693 } else {
694 length = PTRDIFF(tb->limit, base, jschar);
695 tbsize = length * sizeof(jschar);
696 length <<= 1;
697 JS_ARENA_GROW_CAST(base, jschar *, pool, tbsize, tbsize);
698 }
699 if (!base) {
700 JS_ReportOutOfMemory(cx);
701 return JS_FALSE;
702 }
703 tb->base = base;
704 tb->limit = base + length;
705 tb->ptr = base + offset;
706 return JS_TRUE;
707 }
709 static JSBool
710 AddToTokenBuf(JSContext *cx, JSTokenBuf *tb, jschar c)
711 {
712 if (tb->ptr == tb->limit && !GrowTokenBuf(cx, tb))
713 return JS_FALSE;
714 *tb->ptr++ = c;
715 return JS_TRUE;
716 }
718 /*
719 * We have encountered a '\': check for a Unicode escape sequence after it,
720 * returning the character code value if we found a Unicode escape sequence.
721 * Otherwise, non-destructively return the original '\'.
722 */
723 static int32
724 GetUnicodeEscape(JSTokenStream *ts)
725 {
726 jschar cp[5];
727 int32 c;
729 if (PeekChars(ts, 5, cp) && cp[0] == 'u' &&
730 JS7_ISHEX(cp[1]) && JS7_ISHEX(cp[2]) &&
731 JS7_ISHEX(cp[3]) && JS7_ISHEX(cp[4]))
732 {
733 c = (((((JS7_UNHEX(cp[1]) << 4)
734 + JS7_UNHEX(cp[2])) << 4)
735 + JS7_UNHEX(cp[3])) << 4)
736 + JS7_UNHEX(cp[4]);
737 SkipChars(ts, 5);
738 return c;
739 }
740 return '\\';
741 }
743 static JSToken *
744 NewToken(JSTokenStream *ts)
745 {
746 JSToken *tp;
748 ts->cursor = (ts->cursor + 1) & NTOKENS_MASK;
749 tp = &CURRENT_TOKEN(ts);
750 tp->ptr = ts->linebuf.ptr - 1;
751 tp->pos.begin.index = ts->linepos + (tp->ptr - ts->linebuf.base);
752 tp->pos.begin.lineno = tp->pos.end.lineno = (uint16)ts->lineno;
753 return tp;
754 }
756 JSTokenType
757 js_GetToken(JSContext *cx, JSTokenStream *ts)
758 {
759 JSTokenType tt;
760 int32 c, qc;
761 JSToken *tp;
762 JSAtom *atom;
763 JSBool hadUnicodeEscape;
765 #define INIT_TOKENBUF() (ts->tokenbuf.ptr = ts->tokenbuf.base)
766 #define TRIM_TOKENBUF(i) (ts->tokenbuf.ptr = ts->tokenbuf.base + i)
767 #define TOKENBUF_LENGTH() (ts->tokenbuf.ptr - ts->tokenbuf.base)
768 #define TOKENBUF_BASE() (ts->tokenbuf.base)
769 #define TOKENBUF_CHAR(i) (ts->tokenbuf.base[i])
770 #define TOKENBUF_TO_ATOM() (js_AtomizeChars(cx, \
771 TOKENBUF_BASE(), \
772 TOKENBUF_LENGTH(), \
773 0))
775 #define ADD_TO_TOKENBUF(c) \
776 JS_BEGIN_MACRO \
777 if (!AddToTokenBuf(cx, &ts->tokenbuf, (jschar)c)) \
778 goto error; \
779 JS_END_MACRO
781 /* If there was a fatal error, keep returning TOK_ERROR. */
782 if (ts->flags & TSF_ERROR)
783 return TOK_ERROR;
785 /* Check for a pushed-back token resulting from mismatching lookahead. */
786 while (ts->lookahead != 0) {
787 ts->lookahead--;
788 ts->cursor = (ts->cursor + 1) & NTOKENS_MASK;
789 tt = CURRENT_TOKEN(ts).type;
790 if (tt != TOK_EOL || (ts->flags & TSF_NEWLINES))
791 return tt;
792 }
794 retry:
795 do {
796 c = GetChar(ts);
797 if (c == '\n') {
798 ts->flags &= ~TSF_DIRTYLINE;
799 if (ts->flags & TSF_NEWLINES)
800 break;
801 }
802 } while (JS_ISSPACE(c));
804 tp = NewToken(ts);
805 if (c == EOF) {
806 tt = TOK_EOF;
807 goto out;
808 }
810 if (c != '-' && c != '\n')
811 ts->flags |= TSF_DIRTYLINE;
813 hadUnicodeEscape = JS_FALSE;
814 if (JS_ISIDENT_START(c) ||
815 (c == '\\' &&
816 (c = GetUnicodeEscape(ts),
817 hadUnicodeEscape = JS_ISIDENT_START(c)))) {
818 INIT_TOKENBUF();
819 for (;;) {
820 ADD_TO_TOKENBUF(c);
821 c = GetChar(ts);
822 if (c == '\\') {
823 c = GetUnicodeEscape(ts);
824 if (!JS_ISIDENT(c))
825 break;
826 hadUnicodeEscape = JS_TRUE;
827 } else {
828 if (!JS_ISIDENT(c))
829 break;
830 }
831 }
832 UngetChar(ts, c);
834 atom = TOKENBUF_TO_ATOM();
835 if (!atom)
836 goto error;
837 if (!hadUnicodeEscape && ATOM_KEYWORD(atom)) {
838 struct keyword *kw = ATOM_KEYWORD(atom);
840 if (JSVERSION_IS_ECMA(cx->version) || kw->version <= cx->version) {
841 tp->t_op = (JSOp) kw->op;
842 tt = kw->tokentype;
843 goto out;
844 }
845 }
846 tp->t_op = JSOP_NAME;
847 tp->t_atom = atom;
848 tt = TOK_NAME;
849 goto out;
850 }
852 if (JS7_ISDEC(c) || (c == '.' && JS7_ISDEC(PeekChar(ts)))) {
853 jsint radix;
854 const jschar *endptr;
855 jsdouble dval;
857 radix = 10;
858 INIT_TOKENBUF();
860 if (c == '0') {
861 ADD_TO_TOKENBUF(c);
862 c = GetChar(ts);
863 if (JS_TOLOWER(c) == 'x') {
864 ADD_TO_TOKENBUF(c);
865 c = GetChar(ts);
866 radix = 16;
867 } else if (JS7_ISDEC(c)) {
868 radix = 8;
869 }
870 }
872 while (JS7_ISHEX(c)) {
873 if (radix < 16) {
874 if (JS7_ISLET(c))
875 break;
877 /*
878 * We permit 08 and 09 as decimal numbers, which makes our
879 * behaviour a superset of the ECMA numeric grammar. We might
880 * not always be so permissive, so we warn about it.
881 */
882 if (radix == 8 && c >= '8') {
883 if (!js_ReportCompileErrorNumber(cx, ts, NULL,
884 JSREPORT_WARNING,
885 JSMSG_BAD_OCTAL,
886 c == '8' ? "08" : "09")) {
887 goto error;
888 }
889 radix = 10;
890 }
891 }
892 ADD_TO_TOKENBUF(c);
893 c = GetChar(ts);
894 }
896 if (radix == 10 && (c == '.' || JS_TOLOWER(c) == 'e')) {
897 if (c == '.') {
898 do {
899 ADD_TO_TOKENBUF(c);
900 c = GetChar(ts);
901 } while (JS7_ISDEC(c));
902 }
903 if (JS_TOLOWER(c) == 'e') {
904 ADD_TO_TOKENBUF(c);
905 c = GetChar(ts);
906 if (c == '+' || c == '-') {
907 ADD_TO_TOKENBUF(c);
908 c = GetChar(ts);
909 }
910 if (!JS7_ISDEC(c)) {
911 js_ReportCompileErrorNumber(cx, ts, NULL, JSREPORT_ERROR,
912 JSMSG_MISSING_EXPONENT);
913 goto error;
914 }
915 do {
916 ADD_TO_TOKENBUF(c);
917 c = GetChar(ts);
918 } while (JS7_ISDEC(c));
919 }
920 }
922 /* Put back the next char and NUL-terminate tokenbuf for js_strto*. */
923 UngetChar(ts, c);
924 ADD_TO_TOKENBUF(0);
926 if (radix == 10) {
927 if (!js_strtod(cx, TOKENBUF_BASE(), &endptr, &dval)) {
928 js_ReportCompileErrorNumber(cx, ts, NULL, JSREPORT_ERROR,
929 JSMSG_OUT_OF_MEMORY);
930 goto error;
931 }
932 } else {
933 if (!js_strtointeger(cx, TOKENBUF_BASE(), &endptr, radix, &dval)) {
934 js_ReportCompileErrorNumber(cx, ts, NULL, JSREPORT_ERROR,
935 JSMSG_OUT_OF_MEMORY);
936 goto error;
937 }
938 }
939 tp->t_dval = dval;
940 tt = TOK_NUMBER;
941 goto out;
942 }
944 if (c == '"' || c == '\'') {
945 qc = c;
946 INIT_TOKENBUF();
947 while ((c = GetChar(ts)) != qc) {
948 if (c == '\n' || c == EOF) {
949 UngetChar(ts, c);
950 js_ReportCompileErrorNumber(cx, ts, NULL, JSREPORT_ERROR,
951 JSMSG_UNTERMINATED_STRING);
952 goto error;
953 }
954 if (c == '\\') {
955 switch (c = GetChar(ts)) {
956 case 'b': c = '\b'; break;
957 case 'f': c = '\f'; break;
958 case 'n': c = '\n'; break;
959 case 'r': c = '\r'; break;
960 case 't': c = '\t'; break;
961 case 'v': c = '\v'; break;
963 default:
964 if ('0' <= c && c < '8') {
965 int32 val = JS7_UNDEC(c);
967 c = PeekChar(ts);
968 if ('0' <= c && c < '8') {
969 val = 8 * val + JS7_UNDEC(c);
970 GetChar(ts);
971 c = PeekChar(ts);
972 if ('0' <= c && c < '8') {
973 int32 save = val;
974 val = 8 * val + JS7_UNDEC(c);
975 if (val <= 0377)
976 GetChar(ts);
977 else
978 val = save;
979 }
980 }
982 c = (jschar)val;
983 } else if (c == 'u') {
984 jschar cp[4];
985 if (PeekChars(ts, 4, cp) &&
986 JS7_ISHEX(cp[0]) && JS7_ISHEX(cp[1]) &&
987 JS7_ISHEX(cp[2]) && JS7_ISHEX(cp[3])) {
988 c = (((((JS7_UNHEX(cp[0]) << 4)
989 + JS7_UNHEX(cp[1])) << 4)
990 + JS7_UNHEX(cp[2])) << 4)
991 + JS7_UNHEX(cp[3]);
992 SkipChars(ts, 4);
993 }
994 } else if (c == 'x') {
995 jschar cp[2];
996 if (PeekChars(ts, 2, cp) &&
997 JS7_ISHEX(cp[0]) && JS7_ISHEX(cp[1])) {
998 c = (JS7_UNHEX(cp[0]) << 4) + JS7_UNHEX(cp[1]);
999 SkipChars(ts, 2);
1000 }
1001 } else if (c == '\n' && JSVERSION_IS_ECMA(cx->version)) {
1002 /* ECMA follows C by removing escaped newlines. */
1003 continue;
1004 }
1005 break;
1006 }
1007 }
1008 ADD_TO_TOKENBUF(c);
1009 }
1010 atom = TOKENBUF_TO_ATOM();
1011 if (!atom)
1012 goto error;
1013 tp->pos.end.lineno = (uint16)ts->lineno;
1014 tp->t_op = JSOP_STRING;
1015 tp->t_atom = atom;
1016 tt = TOK_STRING;
1017 goto out;
1018 }
1020 switch (c) {
1021 case '\n':
1022 tt = TOK_EOL;
1023 break;
1025 case ';': tt = TOK_SEMI; break;
1026 case '[': tt = TOK_LB; break;
1027 case ']': tt = TOK_RB; break;
1028 case '{': tt = TOK_LC; break;
1029 case '}': tt = TOK_RC; break;
1030 case '(': tt = TOK_LP; break;
1031 case ')': tt = TOK_RP; break;
1032 case ',': tt = TOK_COMMA; break;
1033 case '?': tt = TOK_HOOK; break;
1035 case '.':
1036 tt = TOK_DOT;
1037 break;
1039 case ':':
1040 /*
1041 * Default so compiler can modify to JSOP_GETTER if 'p getter: v' in an
1042 * object initializer, likewise for setter.
1043 */
1044 tp->t_op = JSOP_NOP;
1045 tt = TOK_COLON;
1046 break;
1048 case '|':
1049 if (MatchChar(ts, c)) {
1050 tt = TOK_OR;
1051 } else if (MatchChar(ts, '=')) {
1052 tp->t_op = JSOP_BITOR;
1053 tt = TOK_ASSIGN;
1054 } else {
1055 tt = TOK_BITOR;
1056 }
1057 break;
1059 case '^':
1060 if (MatchChar(ts, '=')) {
1061 tp->t_op = JSOP_BITXOR;
1062 tt = TOK_ASSIGN;
1063 } else {
1064 tt = TOK_BITXOR;
1065 }
1066 break;
1068 case '&':
1069 if (MatchChar(ts, c)) {
1070 tt = TOK_AND;
1071 } else if (MatchChar(ts, '=')) {
1072 tp->t_op = JSOP_BITAND;
1073 tt = TOK_ASSIGN;
1074 } else {
1075 tt = TOK_BITAND;
1076 }
1077 break;
1079 case '=':
1080 if (MatchChar(ts, c)) {
1081 #if JS_HAS_TRIPLE_EQOPS
1082 tp->t_op = MatchChar(ts, c) ? JSOP_NEW_EQ : (JSOp)cx->jsop_eq;
1083 #else
1084 tp->t_op = cx->jsop_eq;
1085 #endif
1086 tt = TOK_EQOP;
1087 } else {
1088 tp->t_op = JSOP_NOP;
1089 tt = TOK_ASSIGN;
1090 }
1091 break;
1093 case '!':
1094 if (MatchChar(ts, '=')) {
1095 #if JS_HAS_TRIPLE_EQOPS
1096 tp->t_op = MatchChar(ts, '=') ? JSOP_NEW_NE : (JSOp)cx->jsop_ne;
1097 #else
1098 tp->t_op = cx->jsop_ne;
1099 #endif
1100 tt = TOK_EQOP;
1101 } else {
1102 tp->t_op = JSOP_NOT;
1103 tt = TOK_UNARYOP;
1104 }
1105 break;
1107 case '<':
1108 /* NB: treat HTML begin-comment as comment-till-end-of-line */
1109 if (MatchChar(ts, '!')) {
1110 if (MatchChar(ts, '-')) {
1111 if (MatchChar(ts, '-'))
1112 goto skipline;
1113 UngetChar(ts, '-');
1114 }
1115 UngetChar(ts, '!');
1116 }
1117 if (MatchChar(ts, c)) {
1118 tp->t_op = JSOP_LSH;
1119 tt = MatchChar(ts, '=') ? TOK_ASSIGN : TOK_SHOP;
1120 } else {
1121 tp->t_op = MatchChar(ts, '=') ? JSOP_LE : JSOP_LT;
1122 tt = TOK_RELOP;
1123 }
1124 break;
1126 case '>':
1127 if (MatchChar(ts, c)) {
1128 tp->t_op = MatchChar(ts, c) ? JSOP_URSH : JSOP_RSH;
1129 tt = MatchChar(ts, '=') ? TOK_ASSIGN : TOK_SHOP;
1130 } else {
1131 tp->t_op = MatchChar(ts, '=') ? JSOP_GE : JSOP_GT;
1132 tt = TOK_RELOP;
1133 }
1134 break;
1136 case '*':
1137 tp->t_op = JSOP_MUL;
1138 tt = MatchChar(ts, '=') ? TOK_ASSIGN : TOK_STAR;
1139 break;
1141 case '/':
1142 if (MatchChar(ts, '/')) {
1143 /*
1144 * Hack for source filters such as the Mozilla XUL preprocessor:
1145 * "//@line 123\n" sets the number of the *next* line after the
1146 * comment to 123.
1147 */
1148 if (JS_HAS_ATLINE_OPTION(cx)) {
1149 jschar cp[5];
1150 uintN i, line, temp;
1151 char filename[1024];
1153 if (PeekChars(ts, 5, cp) &&
1154 cp[0] == '@' &&
1155 cp[1] == 'l' &&
1156 cp[2] == 'i' &&
1157 cp[3] == 'n' &&
1158 cp[4] == 'e') {
1159 SkipChars(ts, 5);
1160 while ((c = GetChar(ts)) != '\n' && JS_ISSPACE(c))
1161 continue;
1162 if (JS7_ISDEC(c)) {
1163 line = JS7_UNDEC(c);
1164 while ((c = GetChar(ts)) != EOF && JS7_ISDEC(c)) {
1165 temp = 10 * line + JS7_UNDEC(c);
1166 if (temp < line) {
1167 /* Ignore overlarge line numbers. */
1168 goto skipline;
1169 }
1170 line = temp;
1171 }
1172 while (c != '\n' && JS_ISSPACE(c))
1173 c = GetChar(ts);
1174 i = 0;
1175 if (c == '"') {
1176 while ((c = GetChar(ts)) != EOF && c != '"') {
1177 if (c == '\n') {
1178 UngetChar(ts, c);
1179 goto skipline;
1180 }
1181 if ((c >> 8) != 0 || i >= sizeof filename - 1)
1182 goto skipline;
1183 filename[i++] = (char) c;
1184 }
1185 if (c == '"') {
1186 while ((c = GetChar(ts)) != '\n' &&
1187 JS_ISSPACE(c)) {
1188 continue;
1189 }
1190 }
1191 }
1192 filename[i] = '\0';
1193 if (c == '\n') {
1194 if (i > 0) {
1195 if (ts->flags & TSF_OWNFILENAME)
1196 JS_free(cx, (void *) ts->filename);
1197 ts->filename = JS_strdup(cx, filename);
1198 if (!ts->filename)
1199 goto error;
1200 ts->flags |= TSF_OWNFILENAME;
1201 }
1202 ts->lineno = line;
1203 }
1204 }
1205 UngetChar(ts, c);
1206 }
1207 }
1209 skipline:
1210 while ((c = GetChar(ts)) != EOF && c != '\n')
1211 continue;
1212 UngetChar(ts, c);
1213 goto retry;
1214 }
1215 if (MatchChar(ts, '*')) {
1216 while ((c = GetChar(ts)) != EOF &&
1217 !(c == '*' && MatchChar(ts, '/'))) {
1218 /* Ignore all characters until comment close. */
1219 }
1220 if (c == EOF) {
1221 js_ReportCompileErrorNumber(cx, ts, NULL, JSREPORT_ERROR,
1222 JSMSG_UNTERMINATED_COMMENT);
1223 goto error;
1224 }
1225 goto retry;
1226 }
1228 #if JS_HAS_REGEXPS
1229 if (ts->flags & TSF_OPERAND) {
1230 JSObject *obj;
1231 uintN flags;
1233 INIT_TOKENBUF();
1234 while ((c = GetChar(ts)) != '/') {
1235 if (c == '\n' || c == EOF) {
1236 UngetChar(ts, c);
1237 js_ReportCompileErrorNumber(cx, ts, NULL, JSREPORT_ERROR,
1238 JSMSG_UNTERMINATED_REGEXP);
1239 goto error;
1240 }
1241 if (c == '\\') {
1242 ADD_TO_TOKENBUF(c);
1243 c = GetChar(ts);
1244 }
1245 ADD_TO_TOKENBUF(c);
1246 }
1247 for (flags = 0; ; ) {
1248 if (MatchChar(ts, 'g'))
1249 flags |= JSREG_GLOB;
1250 else if (MatchChar(ts, 'i'))
1251 flags |= JSREG_FOLD;
1252 else if (MatchChar(ts, 'm'))
1253 flags |= JSREG_MULTILINE;
1254 else
1255 break;
1256 }
1257 c = PeekChar(ts);
1258 if (JS7_ISLET(c)) {
1259 tp->ptr = ts->linebuf.ptr - 1;
1260 js_ReportCompileErrorNumber(cx, ts, NULL, JSREPORT_ERROR,
1261 JSMSG_BAD_REGEXP_FLAG);
1262 (void) GetChar(ts);
1263 goto error;
1264 }
1265 obj = js_NewRegExpObject(cx, ts,
1266 TOKENBUF_BASE(),
1267 TOKENBUF_LENGTH(),
1268 flags);
1269 if (!obj)
1270 goto error;
1271 atom = js_AtomizeObject(cx, obj, 0);
1272 if (!atom)
1273 goto error;
1275 /*
1276 * If the regexp's script is one-shot, we can avoid the extra
1277 * fork-on-exec costs of JSOP_REGEXP by selecting JSOP_OBJECT.
1278 * Otherwise, to avoid incorrect proto, parent, and lastIndex
1279 * sharing among threads and sequentially across re-execution,
1280 * select JSOP_REGEXP.
1281 */
1282 tp->t_op = (cx->fp->flags & (JSFRAME_EVAL | JSFRAME_COMPILE_N_GO))
1283 ? JSOP_OBJECT
1284 : JSOP_REGEXP;
1285 tp->t_atom = atom;
1286 tt = TOK_OBJECT;
1287 break;
1288 }
1289 #endif /* JS_HAS_REGEXPS */
1291 tp->t_op = JSOP_DIV;
1292 tt = MatchChar(ts, '=') ? TOK_ASSIGN : TOK_DIVOP;
1293 break;
1295 case '%':
1296 tp->t_op = JSOP_MOD;
1297 tt = MatchChar(ts, '=') ? TOK_ASSIGN : TOK_DIVOP;
1298 break;
1300 case '~':
1301 tp->t_op = JSOP_BITNOT;
1302 tt = TOK_UNARYOP;
1303 break;
1305 case '+':
1306 if (MatchChar(ts, '=')) {
1307 tp->t_op = JSOP_ADD;
1308 tt = TOK_ASSIGN;
1309 } else if (MatchChar(ts, c)) {
1310 tt = TOK_INC;
1311 } else {
1312 tp->t_op = JSOP_POS;
1313 tt = TOK_PLUS;
1314 }
1315 break;
1317 case '-':
1318 if (MatchChar(ts, '=')) {
1319 tp->t_op = JSOP_SUB;
1320 tt = TOK_ASSIGN;
1321 } else if (MatchChar(ts, c)) {
1322 if (PeekChar(ts) == '>' && !(ts->flags & TSF_DIRTYLINE))
1323 goto skipline;
1324 tt = TOK_DEC;
1325 } else {
1326 tp->t_op = JSOP_NEG;
1327 tt = TOK_MINUS;
1328 }
1329 ts->flags |= TSF_DIRTYLINE;
1330 break;
1332 #if JS_HAS_SHARP_VARS
1333 case '#':
1334 {
1335 uint32 n;
1337 c = GetChar(ts);
1338 if (!JS7_ISDEC(c)) {
1339 UngetChar(ts, c);
1340 goto badchar;
1341 }
1342 n = (uint32)JS7_UNDEC(c);
1343 for (;;) {
1344 c = GetChar(ts);
1345 if (!JS7_ISDEC(c))
1346 break;
1347 n = 10 * n + JS7_UNDEC(c);
1348 if (n >= ATOM_INDEX_LIMIT) {
1349 js_ReportCompileErrorNumber(cx, ts, NULL, JSREPORT_ERROR,
1350 JSMSG_SHARPVAR_TOO_BIG);
1351 goto error;
1352 }
1353 }
1354 tp->t_dval = (jsdouble) n;
1355 if (JS_HAS_STRICT_OPTION(cx) &&
1356 (c == '=' || c == '#')) {
1357 char buf[20];
1358 JS_snprintf(buf, sizeof buf, "#%u%c", n, c);
1359 if (!js_ReportCompileErrorNumber(cx, ts, NULL,
1360 JSREPORT_WARNING |
1361 JSREPORT_STRICT,
1362 JSMSG_DEPRECATED_USAGE,
1363 buf)) {
1364 goto error;
1365 }
1366 }
1367 if (c == '=')
1368 tt = TOK_DEFSHARP;
1369 else if (c == '#')
1370 tt = TOK_USESHARP;
1371 else
1372 goto badchar;
1373 break;
1374 }
1376 badchar:
1377 #endif /* JS_HAS_SHARP_VARS */
1379 default:
1380 js_ReportCompileErrorNumber(cx, ts, NULL, JSREPORT_ERROR,
1381 JSMSG_ILLEGAL_CHARACTER);
1382 goto error;
1383 }
1385 out:
1386 JS_ASSERT(tt < TOK_LIMIT);
1387 tp->pos.end.index = ts->linepos +
1388 (ts->linebuf.ptr - ts->linebuf.base) -
1389 ts->ungetpos;
1390 tp->type = tt;
1391 return tt;
1393 error:
1394 tt = TOK_ERROR;
1395 ts->flags |= TSF_ERROR;
1396 goto out;
1398 #undef INIT_TOKENBUF
1399 #undef TRIM_TOKENBUF
1400 #undef TOKENBUF_LENGTH
1401 #undef TOKENBUF_BASE
1402 #undef TOKENBUF_CHAR
1403 #undef TOKENBUF_TO_ATOM
1404 #undef ADD_TO_TOKENBUF
1405 }
1407 void
1408 js_UngetToken(JSTokenStream *ts)
1409 {
1410 JS_ASSERT(ts->lookahead < NTOKENS_MASK);
1411 if (ts->flags & TSF_ERROR)
1412 return;
1413 ts->lookahead++;
1414 ts->cursor = (ts->cursor - 1) & NTOKENS_MASK;
1415 }
1417 JSBool
1418 js_MatchToken(JSContext *cx, JSTokenStream *ts, JSTokenType tt)
1419 {
1420 if (js_GetToken(cx, ts) == tt)
1421 return JS_TRUE;
1422 js_UngetToken(ts);
1423 return JS_FALSE;
1424 }