projects / p5sagit/Devel-Declare.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | history | HEAD
compiles against 5.8.1 (no threads, no multiplicity)
[p5sagit/Devel-Declare.git] / stolen_chunk_of_toke.c
CommitLineData
e807ee50 1/* stolen_chunk_of_toke.c - from perl 5.8.8 toke.c
2 *
3 * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
4 * 2000, 2001, 2002, 2003, 2004, 2005, 2006, by Larry Wall and others
5 *
6 * You may distribute under the terms of either the GNU General Public
7 * License or the Artistic License, as specified in the README file.
8 *
9 */
10
11/*
12 * "It all comes from here, the stench and the peril." --Frodo
13 */
14
15/*
16 * this is all blatantly stolen. I sincerely hopes it doesn't fuck anything
17 * up but if it does blame me (Matt S Trout), not the poor original authors
18 */
19
71511651 20/* the following #defines are stolen from assorted headers, not toke.c (mst) */
e807ee50 21
22#define DPTR2FPTR(t,p) ((t)PTR2nat(p)) /* data pointer to function pointer */
23#define FPTR2DPTR(t,p) ((t)PTR2nat(p)) /* function pointer to data pointer */
c630715a 24#define PTR2nat(p) (PTRV)(p) /* pointer to integer of PTRSIZE */
e807ee50 25#define MEM_WRAP_CHECK_(n,t) MEM_WRAP_CHECK(n,t),
26#define Newx(v,n,t) (v = (MEM_WRAP_CHECK_(n,t) (t*)safemalloc((MEM_SIZE)((n)*sizeof(t)))))
0ba8c7aa 27#define SvPVX_const(sv) ((const char*) (0 + SvPVX(sv)))
28#define SvPV_renew(sv,n) \
29 STMT_START { SvLEN_set(sv, n); \
30 SvPV_set((sv), (MEM_WRAP_CHECK_(n,char) \
31 (char*)saferealloc((Malloc_t)SvPVX(sv), \
32 (MEM_SIZE)((n))))); \
33 } STMT_END
e807ee50 34
c630715a 35/* On MacOS, respect nonbreaking spaces */
36#ifdef MACOS_TRADITIONAL
37#define SPACE_OR_TAB(c) ((c)==' '||(c)=='\312'||(c)=='\t')
38#else
39#define SPACE_OR_TAB(c) ((c)==' '||(c)=='\t')
40#endif
e807ee50 41
0ba8c7aa 42#define CLINE (PL_copline = (CopLINE(PL_curcop) < PL_copline ? CopLINE(PL_curcop) : PL_copline))
43
e807ee50 44#define LEX_NORMAL 10 /* normal code (ie not within "...") */
45#define LEX_INTERPNORMAL 9 /* code within a string, eg "$foo[$x+1]" */
46#define LEX_INTERPCASEMOD 8 /* expecting a \U, \Q or \E etc */
47#define LEX_INTERPPUSH 7 /* starting a new sublex parse level */
48#define LEX_INTERPSTART 6 /* expecting the start of a $var */
49
50 /* at end of code, eg "$x" followed by: */
51#define LEX_INTERPEND 5 /* ... eg not one of [, { or -> */
52#define LEX_INTERPENDMAYBE 4 /* ... eg one of [, { or -> */
53
54#define LEX_INTERPCONCAT 3 /* expecting anything, eg at start of
55 string or after \E, $foo, etc */
56#define LEX_INTERPCONST 2 /* NOT USED */
57#define LEX_FORMLINE 1 /* expecting a format line */
58#define LEX_KNOWNEXT 0 /* next token known; just return it */
59
71511651 60/* and this one is my own madness (mst) */
61
62#if PERL_REVISION == 5 && PERL_VERSION == 8 && PERL_SUBVERSION >= 8
63#define PERL_5_8_8_PLUS
64#endif
65
66/* and now we're back to the toke.c stuff again (mst) */
67
e807ee50 68static const char ident_too_long[] =
69 "Identifier too long";
70static const char c_without_g[] =
71 "Use of /c modifier is meaningless without /g";
72static const char c_in_subst[] =
73 "Use of /c modifier is meaningless in s///";
74
75#ifdef USE_UTF8_SCRIPTS
76# define UTF (!IN_BYTES)
77#else
78# define UTF ((PL_linestr && DO_UTF8(PL_linestr)) || (PL_hints & HINT_UTF8))
79#endif
80
81/* Invoke the idxth filter function for the current rsfp. */
82/* maxlen 0 = read one text line */
83I32
84Perl_filter_read(pTHX_ int idx, SV *buf_sv, int maxlen)
85{
86 filter_t funcp;
87 SV *datasv = NULL;
88
89 if (!PL_rsfp_filters)
90 return -1;
91 if (idx > AvFILLp(PL_rsfp_filters)) { /* Any more filters? */
92 /* Provide a default input filter to make life easy. */
93 /* Note that we append to the line. This is handy. */
94 DEBUG_P(PerlIO_printf(Perl_debug_log,
95 "filter_read %d: from rsfp\n", idx));
96 if (maxlen) {
97 /* Want a block */
98 int len ;
99 const int old_len = SvCUR(buf_sv);
100
101 /* ensure buf_sv is large enough */
102 SvGROW(buf_sv, (STRLEN)(old_len + maxlen)) ;
103 if ((len = PerlIO_read(PL_rsfp, SvPVX(buf_sv) + old_len, maxlen)) <= 0){
104 if (PerlIO_error(PL_rsfp))
105 return -1; /* error */
106 else
107 return 0 ; /* end of file */
108 }
109 SvCUR_set(buf_sv, old_len + len) ;
110 } else {
111 /* Want a line */
112 if (sv_gets(buf_sv, PL_rsfp, SvCUR(buf_sv)) == NULL) {
113 if (PerlIO_error(PL_rsfp))
114 return -1; /* error */
115 else
116 return 0 ; /* end of file */
117 }
118 }
119 return SvCUR(buf_sv);
120 }
121 /* Skip this filter slot if filter has been deleted */
122 if ( (datasv = FILTER_DATA(idx)) == &PL_sv_undef) {
123 DEBUG_P(PerlIO_printf(Perl_debug_log,
124 "filter_read %d: skipped (filter deleted)\n",
125 idx));
126 return FILTER_READ(idx+1, buf_sv, maxlen); /* recurse */
127 }
128 /* Get function pointer hidden within datasv */
129 funcp = DPTR2FPTR(filter_t, IoANY(datasv));
130 DEBUG_P(PerlIO_printf(Perl_debug_log,
131 "filter_read %d: via function %p (%s)\n",
132 idx, datasv, SvPV_nolen_const(datasv)));
133 /* Call function. The function is expected to */
134 /* call "FILTER_READ(idx+1, buf_sv)" first. */
135 /* Return: <0:error, =0:eof, >0:not eof */
136 return (*funcp)(aTHX_ idx, buf_sv, maxlen);
137}
138
139STATIC char *
140S_filter_gets(pTHX_ register SV *sv, register PerlIO *fp, STRLEN append)
141{
142#ifdef PERL_CR_FILTER
143 if (!PL_rsfp_filters) {
144 filter_add(S_cr_textfilter,NULL);
145 }
146#endif
147 if (PL_rsfp_filters) {
148 if (!append)
149 SvCUR_set(sv, 0); /* start with empty line */
150 if (FILTER_READ(0, sv, 0) > 0)
151 return ( SvPVX(sv) ) ;
152 else
153 return Nullch ;
154 }
155 else
156 return (sv_gets(sv, fp, append));
157}
158
159/*
160 * S_skipspace
161 * Called to gobble the appropriate amount and type of whitespace.
162 * Skips comments as well.
163 */
164
165STATIC char *
166S_skipspace(pTHX_ register char *s)
167{
168 if (PL_lex_formbrack && PL_lex_brackets <= PL_lex_formbrack) {
169 while (s < PL_bufend && SPACE_OR_TAB(*s))
170 s++;
171 return s;
172 }
173 for (;;) {
174 STRLEN prevlen;
175 SSize_t oldprevlen, oldoldprevlen;
176 SSize_t oldloplen = 0, oldunilen = 0;
177 while (s < PL_bufend && isSPACE(*s)) {
178 if (*s++ == '\n' && PL_in_eval && !PL_rsfp)
179 incline(s);
180 }
181
182 /* comment */
183 if (s < PL_bufend && *s == '#') {
184 while (s < PL_bufend && *s != '\n')
185 s++;
186 if (s < PL_bufend) {
187 s++;
188 if (PL_in_eval && !PL_rsfp) {
189 incline(s);
190 continue;
191 }
192 }
193 }
194
195 /* only continue to recharge the buffer if we're at the end
196 * of the buffer, we're not reading from a source filter, and
197 * we're in normal lexing mode
198 */
199 if (s < PL_bufend || !PL_rsfp || PL_sublex_info.sub_inwhat ||
200 PL_lex_state == LEX_FORMLINE)
201 return s;
202
203 /* try to recharge the buffer */
204 if ((s = filter_gets(PL_linestr, PL_rsfp,
205 (prevlen = SvCUR(PL_linestr)))) == Nullch)
206 {
207 /* end of file. Add on the -p or -n magic */
208 if (PL_minus_p) {
209 sv_setpv(PL_linestr,
210 ";}continue{print or die qq(-p destination: $!\\n);}");
211 PL_minus_n = PL_minus_p = 0;
212 }
213 else if (PL_minus_n) {
214 sv_setpvn(PL_linestr, ";}", 2);
215 PL_minus_n = 0;
216 }
217 else
218 sv_setpvn(PL_linestr,";", 1);
219
220 /* reset variables for next time we lex */
221 PL_oldoldbufptr = PL_oldbufptr = PL_bufptr = s = PL_linestart
222 = SvPVX(PL_linestr);
223 PL_bufend = SvPVX(PL_linestr) + SvCUR(PL_linestr);
224 PL_last_lop = PL_last_uni = Nullch;
225
226 /* Close the filehandle. Could be from -P preprocessor,
227 * STDIN, or a regular file. If we were reading code from
228 * STDIN (because the commandline held no -e or filename)
229 * then we don't close it, we reset it so the code can
230 * read from STDIN too.
231 */
232
233 if (PL_preprocess && !PL_in_eval)
234 (void)PerlProc_pclose(PL_rsfp);
235 else if ((PerlIO*)PL_rsfp == PerlIO_stdin())
236 PerlIO_clearerr(PL_rsfp);
237 else
238 (void)PerlIO_close(PL_rsfp);
239 PL_rsfp = Nullfp;
240 return s;
241 }
242
243 /* not at end of file, so we only read another line */
244 /* make corresponding updates to old pointers, for yyerror() */
245 oldprevlen = PL_oldbufptr - PL_bufend;
246 oldoldprevlen = PL_oldoldbufptr - PL_bufend;
247 if (PL_last_uni)
248 oldunilen = PL_last_uni - PL_bufend;
249 if (PL_last_lop)
250 oldloplen = PL_last_lop - PL_bufend;
251 PL_linestart = PL_bufptr = s + prevlen;
252 PL_bufend = s + SvCUR(PL_linestr);
253 s = PL_bufptr;
254 PL_oldbufptr = s + oldprevlen;
255 PL_oldoldbufptr = s + oldoldprevlen;
256 if (PL_last_uni)
257 PL_last_uni = s + oldunilen;
258 if (PL_last_lop)
259 PL_last_lop = s + oldloplen;
260 incline(s);
261
262 /* debugger active and we're not compiling the debugger code,
263 * so store the line into the debugger's array of lines
264 */
265 if (PERLDB_LINE && PL_curstash != PL_debstash) {
266 SV * const sv = NEWSV(85,0);
267
268 sv_upgrade(sv, SVt_PVMG);
269 sv_setpvn(sv,PL_bufptr,PL_bufend-PL_bufptr);
270 (void)SvIOK_on(sv);
271 SvIV_set(sv, 0);
272 av_store(CopFILEAV(PL_curcop),(I32)CopLINE(PL_curcop),sv);
273 }
274 }
275}
276
277STATIC char *
278S_scan_word(pTHX_ register char *s, char *dest, STRLEN destlen, int allow_package, STRLEN *slp)
279{
280 register char *d = dest;
281 register char * const e = d + destlen - 3; /* two-character token, ending NUL */
282 for (;;) {
283 if (d >= e)
284 Perl_croak(aTHX_ ident_too_long);
285 if (isALNUM(*s)) /* UTF handled below */
286 *d++ = *s++;
287 else if (*s == '\'' && allow_package && isIDFIRST_lazy_if(s+1,UTF)) {
288 *d++ = ':';
289 *d++ = ':';
290 s++;
291 }
292 else if (*s == ':' && s[1] == ':' && allow_package && s[2] != '$') {
293 *d++ = *s++;
294 *d++ = *s++;
295 }
296 else if (UTF && UTF8_IS_START(*s) && isALNUM_utf8((U8*)s)) {
297 char *t = s + UTF8SKIP(s);
298 while (UTF8_IS_CONTINUED(*t) && is_utf8_mark((U8*)t))
299 t += UTF8SKIP(t);
300 if (d + (t - s) > e)
301 Perl_croak(aTHX_ ident_too_long);
302 Copy(s, d, t - s, char);
303 d += t - s;
304 s = t;
305 }
306 else {
307 *d = '\0';
308 *slp = d - dest;
309 return s;
310 }
311 }
312}
313
314/*
315 * S_incline
316 * This subroutine has nothing to do with tilting, whether at windmills
317 * or pinball tables. Its name is short for "increment line". It
318 * increments the current line number in CopLINE(PL_curcop) and checks
319 * to see whether the line starts with a comment of the form
320 * # line 500 "foo.pm"
321 * If so, it sets the current line number and file to the values in the comment.
322 */
323
324STATIC void
325S_incline(pTHX_ char *s)
326{
327 char *t;
328 char *n;
329 char *e;
330 char ch;
331
332 CopLINE_inc(PL_curcop);
333 if (*s++ != '#')
334 return;
335 while (SPACE_OR_TAB(*s)) s++;
336 if (strnEQ(s, "line", 4))
337 s += 4;
338 else
339 return;
340 if (SPACE_OR_TAB(*s))
341 s++;
342 else
343 return;
344 while (SPACE_OR_TAB(*s)) s++;
345 if (!isDIGIT(*s))
346 return;
347 n = s;
348 while (isDIGIT(*s))
349 s++;
350 while (SPACE_OR_TAB(*s))
351 s++;
352 if (*s == '"' && (t = strchr(s+1, '"'))) {
353 s++;
354 e = t + 1;
355 }
356 else {
357 for (t = s; !isSPACE(*t); t++) ;
358 e = t;
359 }
360 while (SPACE_OR_TAB(*e) || *e == '\r' || *e == '\f')
361 e++;
362 if (*e != '\n' && *e != '\0')
363 return; /* false alarm */
364
365 ch = *t;
366 *t = '\0';
367 if (t - s > 0) {
71511651 368/* this chunk was added to S_incline during 5.8.8. I don't know why but I don't
369 honestly care since I probably want to be bug-compatible anyway (mst) */
370
371/* ... my kingdom for a perl parser in perl ... (mst) */
372
373#ifdef PERL_5_8_8_PLUS
e807ee50 374#ifndef USE_ITHREADS
375 const char *cf = CopFILE(PL_curcop);
376 if (cf && strlen(cf) > 7 && strnEQ(cf, "(eval ", 6)) {
377 /* must copy *{"::_<(eval N)[oldfilename:L]"}
378 * to *{"::_<newfilename"} */
379 char smallbuf[256], smallbuf2[256];
380 char *tmpbuf, *tmpbuf2;
381 GV **gvp, *gv2;
382 STRLEN tmplen = strlen(cf);
383 STRLEN tmplen2 = strlen(s);
384 if (tmplen + 3 < sizeof smallbuf)
385 tmpbuf = smallbuf;
386 else
387 Newx(tmpbuf, tmplen + 3, char);
388 if (tmplen2 + 3 < sizeof smallbuf2)
389 tmpbuf2 = smallbuf2;
390 else
391 Newx(tmpbuf2, tmplen2 + 3, char);
392 tmpbuf[0] = tmpbuf2[0] = '_';
393 tmpbuf[1] = tmpbuf2[1] = '<';
394 memcpy(tmpbuf + 2, cf, ++tmplen);
395 memcpy(tmpbuf2 + 2, s, ++tmplen2);
396 ++tmplen; ++tmplen2;
397 gvp = (GV**)hv_fetch(PL_defstash, tmpbuf, tmplen, FALSE);
398 if (gvp) {
399 gv2 = *(GV**)hv_fetch(PL_defstash, tmpbuf2, tmplen2, TRUE);
400 if (!isGV(gv2))
401 gv_init(gv2, PL_defstash, tmpbuf2, tmplen2, FALSE);
402 /* adjust ${"::_<newfilename"} to store the new file name */
403 GvSV(gv2) = newSVpvn(tmpbuf2 + 2, tmplen2 - 2);
404 GvHV(gv2) = (HV*)SvREFCNT_inc(GvHV(*gvp));
405 GvAV(gv2) = (AV*)SvREFCNT_inc(GvAV(*gvp));
406 }
407 if (tmpbuf != smallbuf) Safefree(tmpbuf);
408 if (tmpbuf2 != smallbuf2) Safefree(tmpbuf2);
409 }
410#endif
71511651 411#endif
412/* second endif closes out the "are we 5.8.(8+)" conditional */
e807ee50 413 CopFILE_free(PL_curcop);
414 CopFILE_set(PL_curcop, s);
415 }
416 *t = ch;
417 CopLINE_set(PL_curcop, atoi(n)-1);
418}
0ba8c7aa 419
420/* scan_str
421 takes: start position in buffer
422 keep_quoted preserve \ on the embedded delimiter(s)
423 keep_delims preserve the delimiters around the string
424 returns: position to continue reading from buffer
425 side-effects: multi_start, multi_close, lex_repl or lex_stuff, and
426 updates the read buffer.
427
428 This subroutine pulls a string out of the input. It is called for:
429 q single quotes q(literal text)
430 ' single quotes 'literal text'
431 qq double quotes qq(interpolate $here please)
432 " double quotes "interpolate $here please"
433 qx backticks qx(/bin/ls -l)
434 ` backticks `/bin/ls -l`
435 qw quote words @EXPORT_OK = qw( func() $spam )
436 m// regexp match m/this/
437 s/// regexp substitute s/this/that/
438 tr/// string transliterate tr/this/that/
439 y/// string transliterate y/this/that/
440 ($*@) sub prototypes sub foo ($)
441 (stuff) sub attr parameters sub foo : attr(stuff)
442 <> readline or globs <FOO>, <>, <$fh>, or <*.c>
443
444 In most of these cases (all but <>, patterns and transliterate)
445 yylex() calls scan_str(). m// makes yylex() call scan_pat() which
446 calls scan_str(). s/// makes yylex() call scan_subst() which calls
447 scan_str(). tr/// and y/// make yylex() call scan_trans() which
448 calls scan_str().
449
450 It skips whitespace before the string starts, and treats the first
451 character as the delimiter. If the delimiter is one of ([{< then
452 the corresponding "close" character )]}> is used as the closing
453 delimiter. It allows quoting of delimiters, and if the string has
454 balanced delimiters ([{<>}]) it allows nesting.
455
456 On success, the SV with the resulting string is put into lex_stuff or,
457 if that is already non-NULL, into lex_repl. The second case occurs only
458 when parsing the RHS of the special constructs s/// and tr/// (y///).
459 For convenience, the terminating delimiter character is stuffed into
460 SvIVX of the SV.
461*/
462
463STATIC char *
464S_scan_str(pTHX_ char *start, int keep_quoted, int keep_delims)
465{
466 SV *sv; /* scalar value: string */
467 char *tmps; /* temp string, used for delimiter matching */
468 register char *s = start; /* current position in the buffer */
469 register char term; /* terminating character */
470 register char *to; /* current position in the sv's data */
471 I32 brackets = 1; /* bracket nesting level */
472 bool has_utf8 = FALSE; /* is there any utf8 content? */
473 I32 termcode; /* terminating char. code */
71511651 474 /* 5.8.7+ uses UTF8_MAXBYTES but also its utf8.h defs _MAXLEN to it so
475 I'm reasonably hopeful this won't destroy anything (mst) */
476 U8 termstr[UTF8_MAXLEN]; /* terminating string */
0ba8c7aa 477 STRLEN termlen; /* length of terminating string */
478 char *last = NULL; /* last position for nesting bracket */
479
480 /* skip space before the delimiter */
481 if (isSPACE(*s))
482 s = skipspace(s);
483
484 /* mark where we are, in case we need to report errors */
485 CLINE;
486
487 /* after skipping whitespace, the next character is the terminator */
488 term = *s;
489 if (!UTF) {
490 termcode = termstr[0] = term;
491 termlen = 1;
492 }
493 else {
494 termcode = utf8_to_uvchr((U8*)s, &termlen);
495 Copy(s, termstr, termlen, U8);
496 if (!UTF8_IS_INVARIANT(term))
497 has_utf8 = TRUE;
498 }
499
500 /* mark where we are */
501 PL_multi_start = CopLINE(PL_curcop);
502 PL_multi_open = term;
503
504 /* find corresponding closing delimiter */
505 if (term && (tmps = strchr("([{< )]}> )]}>",term)))
506 termcode = termstr[0] = term = tmps[5];
507
508 PL_multi_close = term;
509
510 /* create a new SV to hold the contents. 87 is leak category, I'm
511 assuming. 79 is the SV's initial length. What a random number. */
512 sv = NEWSV(87,79);
513 sv_upgrade(sv, SVt_PVIV);
514 SvIV_set(sv, termcode);
515 (void)SvPOK_only(sv); /* validate pointer */
516
517 /* move past delimiter and try to read a complete string */
518 if (keep_delims)
519 sv_catpvn(sv, s, termlen);
520 s += termlen;
521 for (;;) {
522 if (PL_encoding && !UTF) {
523 bool cont = TRUE;
524
525 while (cont) {
526 int offset = s - SvPVX_const(PL_linestr);
527 const bool found = sv_cat_decode(sv, PL_encoding, PL_linestr,
528 &offset, (char*)termstr, termlen);
529 const char *ns = SvPVX_const(PL_linestr) + offset;
530 char *svlast = SvEND(sv) - 1;
531
532 for (; s < ns; s++) {
533 if (*s == '\n' && !PL_rsfp)
534 CopLINE_inc(PL_curcop);
535 }
536 if (!found)
537 goto read_more_line;
538 else {
539 /* handle quoted delimiters */
540 if (SvCUR(sv) > 1 && *(svlast-1) == '\\') {
541 const char *t;
542 for (t = svlast-2; t >= SvPVX_const(sv) && *t == '\\';)
543 t--;
544 if ((svlast-1 - t) % 2) {
545 if (!keep_quoted) {
546 *(svlast-1) = term;
547 *svlast = '\0';
548 SvCUR_set(sv, SvCUR(sv) - 1);
549 }
550 continue;
551 }
552 }
553 if (PL_multi_open == PL_multi_close) {
554 cont = FALSE;
555 }
556 else {
557 const char *t;
558 char *w;
559 if (!last)
560 last = SvPVX(sv);
561 for (t = w = last; t < svlast; w++, t++) {
562 /* At here, all closes are "was quoted" one,
563 so we don't check PL_multi_close. */
564 if (*t == '\\') {
565 if (!keep_quoted && *(t+1) == PL_multi_open)
566 t++;
567 else
568 *w++ = *t++;
569 }
570 else if (*t == PL_multi_open)
571 brackets++;
572
573 *w = *t;
574 }
575 if (w < t) {
576 *w++ = term;
577 *w = '\0';
578 SvCUR_set(sv, w - SvPVX_const(sv));
579 }
580 last = w;
581 if (--brackets <= 0)
582 cont = FALSE;
583 }
584 }
585 }
586 if (!keep_delims) {
587 SvCUR_set(sv, SvCUR(sv) - 1);
588 *SvEND(sv) = '\0';
589 }
590 break;
591 }
592
593 /* extend sv if need be */
594 SvGROW(sv, SvCUR(sv) + (PL_bufend - s) + 1);
595 /* set 'to' to the next character in the sv's string */
596 to = SvPVX(sv)+SvCUR(sv);
597
598 /* if open delimiter is the close delimiter read unbridle */
599 if (PL_multi_open == PL_multi_close) {
600 for (; s < PL_bufend; s++,to++) {
601 /* embedded newlines increment the current line number */
602 if (*s == '\n' && !PL_rsfp)
603 CopLINE_inc(PL_curcop);
604 /* handle quoted delimiters */
605 if (*s == '\\' && s+1 < PL_bufend && term != '\\') {
606 if (!keep_quoted && s[1] == term)
607 s++;
608 /* any other quotes are simply copied straight through */
609 else
610 *to++ = *s++;
611 }
612 /* terminate when run out of buffer (the for() condition), or
613 have found the terminator */
614 else if (*s == term) {
615 if (termlen == 1)
616 break;
617 if (s+termlen <= PL_bufend && memEQ(s, (char*)termstr, termlen))
618 break;
619 }
620 else if (!has_utf8 && !UTF8_IS_INVARIANT((U8)*s) && UTF)
621 has_utf8 = TRUE;
622 *to = *s;
623 }
624 }
625
626 /* if the terminator isn't the same as the start character (e.g.,
627 matched brackets), we have to allow more in the quoting, and
628 be prepared for nested brackets.
629 */
630 else {
631 /* read until we run out of string, or we find the terminator */
632 for (; s < PL_bufend; s++,to++) {
633 /* embedded newlines increment the line count */
634 if (*s == '\n' && !PL_rsfp)
635 CopLINE_inc(PL_curcop);
636 /* backslashes can escape the open or closing characters */
637 if (*s == '\\' && s+1 < PL_bufend) {
638 if (!keep_quoted &&
639 ((s[1] == PL_multi_open) || (s[1] == PL_multi_close)))
640 s++;
641 else
642 *to++ = *s++;
643 }
644 /* allow nested opens and closes */
645 else if (*s == PL_multi_close && --brackets <= 0)
646 break;
647 else if (*s == PL_multi_open)
648 brackets++;
649 else if (!has_utf8 && !UTF8_IS_INVARIANT((U8)*s) && UTF)
650 has_utf8 = TRUE;
651 *to = *s;
652 }
653 }
654 /* terminate the copied string and update the sv's end-of-string */
655 *to = '\0';
656 SvCUR_set(sv, to - SvPVX_const(sv));
657
658 /*
659 * this next chunk reads more into the buffer if we're not done yet
660 */
661
662 if (s < PL_bufend)
663 break; /* handle case where we are done yet :-) */
664
665#ifndef PERL_STRICT_CR
666 if (to - SvPVX_const(sv) >= 2) {
667 if ((to[-2] == '\r' && to[-1] == '\n') ||
668 (to[-2] == '\n' && to[-1] == '\r'))
669 {
670 to[-2] = '\n';
671 to--;
672 SvCUR_set(sv, to - SvPVX_const(sv));
673 }
674 else if (to[-1] == '\r')
675 to[-1] = '\n';
676 }
677 else if (to - SvPVX_const(sv) == 1 && to[-1] == '\r')
678 to[-1] = '\n';
679#endif
680
681 read_more_line:
682 /* if we're out of file, or a read fails, bail and reset the current
683 line marker so we can report where the unterminated string began
684 */
685 if (!PL_rsfp ||
686 !(PL_oldoldbufptr = PL_oldbufptr = s = PL_linestart = filter_gets(PL_linestr, PL_rsfp, 0))) {
687 sv_free(sv);
688 CopLINE_set(PL_curcop, (line_t)PL_multi_start);
689 return Nullch;
690 }
691 /* we read a line, so increment our line counter */
692 CopLINE_inc(PL_curcop);
693
694 /* update debugger info */
695 if (PERLDB_LINE && PL_curstash != PL_debstash) {
696 SV *sv = NEWSV(88,0);
697
698 sv_upgrade(sv, SVt_PVMG);
699 sv_setsv(sv,PL_linestr);
700 (void)SvIOK_on(sv);
701 SvIV_set(sv, 0);
702 av_store(CopFILEAV(PL_curcop), (I32)CopLINE(PL_curcop), sv);
703 }
704
705 /* having changed the buffer, we must update PL_bufend */
706 PL_bufend = SvPVX(PL_linestr) + SvCUR(PL_linestr);
707 PL_last_lop = PL_last_uni = Nullch;
708 }
709
710 /* at this point, we have successfully read the delimited string */
711
712 if (!PL_encoding || UTF) {
713 if (keep_delims)
714 sv_catpvn(sv, s, termlen);
715 s += termlen;
716 }
717 if (has_utf8 || PL_encoding)
718 SvUTF8_on(sv);
719
720 PL_multi_end = CopLINE(PL_curcop);
721
722 /* if we allocated too much space, give some back */
723 if (SvCUR(sv) + 5 < SvLEN(sv)) {
724 SvLEN_set(sv, SvCUR(sv) + 1);
71511651 725/* 5.8.8 uses SvPV_renew, no prior version actually has the damn thing (mst) */
726#ifdef PERL_5_8_8_PLUS
0ba8c7aa 727 SvPV_renew(sv, SvLEN(sv));
71511651 728#else
729 Renew(SvPVX(sv), SvLEN(sv), char);
730#endif
0ba8c7aa 731 }
732
733 /* decide whether this is the first or second quoted string we've read
734 for this op
735 */
736
737 if (PL_lex_stuff)
738 PL_lex_repl = sv;
739 else
740 PL_lex_stuff = sv;
741 return s;
742}
743
744/*
745 * S_force_next
746 * When the lexer realizes it knows the next token (for instance,
747 * it is reordering tokens for the parser) then it can call S_force_next
748 * to know what token to return the next time the lexer is called. Caller
749 * will need to set PL_nextval[], and possibly PL_expect to ensure the lexer
750 * handles the token correctly.
751 */
752
753STATIC void
754S_force_next(pTHX_ I32 type)
755{
756 PL_nexttype[PL_nexttoke] = type;
757 PL_nexttoke++;
758 if (PL_lex_state != LEX_KNOWNEXT) {
759 PL_lex_defer = PL_lex_state;
760 PL_lex_expect = PL_expect;
761 PL_lex_state = LEX_KNOWNEXT;
762 }
763}
Unnamed repository; edit this file to name it for gitweb.