1 /* stolen_chunk_of_toke.c - from perl 5.8.8 toke.c
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
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.
12 * "It all comes from here, the stench and the peril." --Frodo
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
20 /* the following #defines are stolen from assorted headers, not toke.c (mst) */
22 #define skipspace(a) S_skipspace(aTHX_ a)
23 #define incline(a) S_incline(aTHX_ a)
24 #define filter_gets(a,b,c) S_filter_gets(aTHX_ a,b,c)
25 #define scan_str(a,b,c) S_scan_str(aTHX_ a,b,c)
26 #define scan_word(a,b,c,d,e) S_scan_word(aTHX_ a,b,c,d,e)
28 STATIC void S_incline(pTHX_ char *s);
29 STATIC char* S_skipspace(pTHX_ char *s);
30 STATIC char * S_filter_gets(pTHX_ SV *sv, PerlIO *fp, STRLEN append);
31 STATIC char* S_scan_str(pTHX_ char *start, int keep_quoted, int keep_delims);
32 STATIC char* S_scan_word(pTHX_ char *s, char *dest, STRLEN destlen, int allow_package, STRLEN *slp);
34 #define DPTR2FPTR(t,p) ((t)PTR2nat(p)) /* data pointer to function pointer */
35 #define FPTR2DPTR(t,p) ((t)PTR2nat(p)) /* function pointer to data pointer */
36 #define PTR2nat(p) (PTRV)(p) /* pointer to integer of PTRSIZE */
37 #define MEM_WRAP_CHECK_(n,t) MEM_WRAP_CHECK(n,t),
39 /* conditionalise these two because as of 5.9.5 we already get them from
42 #define Newx(v,n,t) (v = (MEM_WRAP_CHECK_(n,t) (t*)safemalloc((MEM_SIZE)((n)*sizeof(t)))))
45 #define SvPVX_const(sv) ((const char*) (0 + SvPVX(sv)))
48 #define SvPV_renew(sv,n) \
49 STMT_START { SvLEN_set(sv, n); \
50 SvPV_set((sv), (MEM_WRAP_CHECK_(n,char) \
51 (char*)saferealloc((Malloc_t)SvPVX(sv), \
55 /* On MacOS, respect nonbreaking spaces */
56 #ifdef MACOS_TRADITIONAL
57 #define SPACE_OR_TAB(c) ((c)==' '||(c)=='\312'||(c)=='\t')
59 #define SPACE_OR_TAB(c) ((c)==' '||(c)=='\t')
62 #define CLINE (PL_copline = (CopLINE(PL_curcop) < PL_copline ? CopLINE(PL_curcop) : PL_copline))
64 #define LEX_NORMAL 10 /* normal code (ie not within "...") */
65 #define LEX_INTERPNORMAL 9 /* code within a string, eg "$foo[$x+1]" */
66 #define LEX_INTERPCASEMOD 8 /* expecting a \U, \Q or \E etc */
67 #define LEX_INTERPPUSH 7 /* starting a new sublex parse level */
68 #define LEX_INTERPSTART 6 /* expecting the start of a $var */
70 /* at end of code, eg "$x" followed by: */
71 #define LEX_INTERPEND 5 /* ... eg not one of [, { or -> */
72 #define LEX_INTERPENDMAYBE 4 /* ... eg one of [, { or -> */
74 #define LEX_INTERPCONCAT 3 /* expecting anything, eg at start of
75 string or after \E, $foo, etc */
76 #define LEX_INTERPCONST 2 /* NOT USED */
77 #define LEX_FORMLINE 1 /* expecting a format line */
78 #define LEX_KNOWNEXT 0 /* next token known; just return it */
80 /* and these two are my own madness (mst) */
82 #if PERL_REVISION == 5 && PERL_VERSION == 8 && PERL_SUBVERSION >= 8
83 #define PERL_5_8_8_PLUS
86 #if PERL_REVISION == 5 && PERL_VERSION > 8
91 /* 5.9+ moves a bunch of things to a PL_parser struct so we need to
92 declare the backcompat macros for things to still work (mst) */
94 /* XXX temporary backwards compatibility */
95 #define PL_lex_brackets (PL_parser->lex_brackets)
96 #define PL_lex_brackstack (PL_parser->lex_brackstack)
97 #define PL_lex_casemods (PL_parser->lex_casemods)
98 #define PL_lex_casestack (PL_parser->lex_casestack)
99 #define PL_lex_defer (PL_parser->lex_defer)
100 #define PL_lex_dojoin (PL_parser->lex_dojoin)
101 #define PL_lex_expect (PL_parser->lex_expect)
102 #define PL_lex_formbrack (PL_parser->lex_formbrack)
103 #define PL_lex_inpat (PL_parser->lex_inpat)
104 #define PL_lex_inwhat (PL_parser->lex_inwhat)
105 #define PL_lex_op (PL_parser->lex_op)
106 #define PL_lex_repl (PL_parser->lex_repl)
107 #define PL_lex_starts (PL_parser->lex_starts)
108 #define PL_lex_stuff (PL_parser->lex_stuff)
109 #define PL_multi_start (PL_parser->multi_start)
110 #define PL_multi_open (PL_parser->multi_open)
111 #define PL_multi_close (PL_parser->multi_close)
112 #define PL_pending_ident (PL_parser->pending_ident)
113 #define PL_preambled (PL_parser->preambled)
114 #define PL_sublex_info (PL_parser->sublex_info)
115 #define PL_linestr (PL_parser->linestr)
116 #define PL_sublex_info (PL_parser->sublex_info)
117 #define PL_linestr (PL_parser->linestr)
118 #define PL_expect (PL_parser->expect)
119 #define PL_copline (PL_parser->copline)
120 #define PL_bufptr (PL_parser->bufptr)
121 #define PL_oldbufptr (PL_parser->oldbufptr)
122 #define PL_oldoldbufptr (PL_parser->oldoldbufptr)
123 #define PL_linestart (PL_parser->linestart)
124 #define PL_bufend (PL_parser->bufend)
125 #define PL_last_uni (PL_parser->last_uni)
126 #define PL_last_lop (PL_parser->last_lop)
127 #define PL_last_lop_op (PL_parser->last_lop_op)
128 #define PL_lex_state (PL_parser->lex_state)
129 #define PL_rsfp (PL_parser->rsfp)
130 #define PL_rsfp_filters (PL_parser->rsfp_filters)
131 #define PL_in_my (PL_parser->in_my)
132 #define PL_in_my_stash (PL_parser->in_my_stash)
133 #define PL_tokenbuf (PL_parser->tokenbuf)
134 #define PL_multi_end (PL_parser->multi_end)
135 #define PL_error_count (PL_parser->error_count)
136 /* these three are from the non-PERL_MAD path but I don't -think- I need
137 the PERL_MAD stuff since my code isn't really populating things (mst) */
138 # define PL_nexttoke (PL_parser->nexttoke)
139 # define PL_nexttype (PL_parser->nexttype)
140 # define PL_nextval (PL_parser->nextval)
141 /* end of backcompat macros form 5.9 toke.c (mst) */
144 /* when ccflags include -DDEBUGGING we need this for earlier 5.8 perls */
145 #ifndef SvPV_nolen_const
146 #define SvPV_nolen_const SvPV_nolen
149 /* and now we're back to the toke.c stuff again (mst) */
151 static const char ident_too_long[] =
152 "Identifier too long";
153 static const char c_without_g[] =
154 "Use of /c modifier is meaningless without /g";
155 static const char c_in_subst[] =
156 "Use of /c modifier is meaningless in s///";
158 #ifdef USE_UTF8_SCRIPTS
159 # define UTF (!IN_BYTES)
161 # define UTF ((PL_linestr && DO_UTF8(PL_linestr)) || (PL_hints & HINT_UTF8))
164 /* Invoke the idxth filter function for the current rsfp. */
165 /* maxlen 0 = read one text line */
167 Perl_filter_read(pTHX_ int idx, SV *buf_sv, int maxlen)
172 if (!PL_rsfp_filters)
174 if (idx > AvFILLp(PL_rsfp_filters)) { /* Any more filters? */
175 /* Provide a default input filter to make life easy. */
176 /* Note that we append to the line. This is handy. */
177 DEBUG_P(PerlIO_printf(Perl_debug_log,
178 "filter_read %d: from rsfp\n", idx));
182 const int old_len = SvCUR(buf_sv);
184 /* ensure buf_sv is large enough */
185 SvGROW(buf_sv, (STRLEN)(old_len + maxlen)) ;
186 if ((len = PerlIO_read(PL_rsfp, SvPVX(buf_sv) + old_len, maxlen)) <= 0){
187 if (PerlIO_error(PL_rsfp))
188 return -1; /* error */
190 return 0 ; /* end of file */
192 SvCUR_set(buf_sv, old_len + len) ;
195 if (sv_gets(buf_sv, PL_rsfp, SvCUR(buf_sv)) == NULL) {
196 if (PerlIO_error(PL_rsfp))
197 return -1; /* error */
199 return 0 ; /* end of file */
202 return SvCUR(buf_sv);
204 /* Skip this filter slot if filter has been deleted */
205 if ( (datasv = FILTER_DATA(idx)) == &PL_sv_undef) {
206 DEBUG_P(PerlIO_printf(Perl_debug_log,
207 "filter_read %d: skipped (filter deleted)\n",
209 return FILTER_READ(idx+1, buf_sv, maxlen); /* recurse */
211 /* Get function pointer hidden within datasv */
212 funcp = DPTR2FPTR(filter_t, IoANY(datasv));
213 DEBUG_P(PerlIO_printf(Perl_debug_log,
214 "filter_read %d: via function %p (%s)\n",
215 idx, datasv, SvPV_nolen_const(datasv)));
216 /* Call function. The function is expected to */
217 /* call "FILTER_READ(idx+1, buf_sv)" first. */
218 /* Return: <0:error, =0:eof, >0:not eof */
219 return (*funcp)(aTHX_ idx, buf_sv, maxlen);
223 S_filter_gets(pTHX_ register SV *sv, register PerlIO *fp, STRLEN append)
225 #ifdef PERL_CR_FILTER
226 if (!PL_rsfp_filters) {
227 filter_add(S_cr_textfilter,NULL);
230 if (PL_rsfp_filters) {
232 SvCUR_set(sv, 0); /* start with empty line */
233 if (FILTER_READ(0, sv, 0) > 0)
234 return ( SvPVX(sv) ) ;
239 return (sv_gets(sv, fp, append));
244 * Called to gobble the appropriate amount and type of whitespace.
245 * Skips comments as well.
249 S_skipspace(pTHX_ register char *s)
251 if (PL_lex_formbrack && PL_lex_brackets <= PL_lex_formbrack) {
252 while (s < PL_bufend && SPACE_OR_TAB(*s))
258 SSize_t oldprevlen, oldoldprevlen;
259 SSize_t oldloplen = 0, oldunilen = 0;
260 while (s < PL_bufend && isSPACE(*s)) {
261 if (*s++ == '\n' && PL_in_eval && !PL_rsfp)
266 if (s < PL_bufend && *s == '#') {
267 while (s < PL_bufend && *s != '\n')
271 if (PL_in_eval && !PL_rsfp) {
278 /* only continue to recharge the buffer if we're at the end
279 * of the buffer, we're not reading from a source filter, and
280 * we're in normal lexing mode
282 if (s < PL_bufend || !PL_rsfp || PL_sublex_info.sub_inwhat ||
283 PL_lex_state == LEX_FORMLINE)
286 /* try to recharge the buffer */
287 if ((s = filter_gets(PL_linestr, PL_rsfp,
288 (prevlen = SvCUR(PL_linestr)))) == Nullch)
290 /* end of file. Add on the -p or -n magic */
293 ";}continue{print or die qq(-p destination: $!\\n);}");
294 PL_minus_n = PL_minus_p = 0;
296 else if (PL_minus_n) {
297 sv_setpvn(PL_linestr, ";}", 2);
301 sv_setpvn(PL_linestr,";", 1);
303 /* reset variables for next time we lex */
304 PL_oldoldbufptr = PL_oldbufptr = PL_bufptr = s = PL_linestart
306 PL_bufend = SvPVX(PL_linestr) + SvCUR(PL_linestr);
307 PL_last_lop = PL_last_uni = Nullch;
309 /* In perl versions previous to p4-rawid: //depot/perl@32954 -P
310 * preprocessors were supported here. We don't support -P at all, even
311 * on perls that support it, and use the following chunk from blead
315 /* Close the filehandle. Could be from
316 * STDIN, or a regular file. If we were reading code from
317 * STDIN (because the commandline held no -e or filename)
318 * then we don't close it, we reset it so the code can
319 * read from STDIN too.
322 if ((PerlIO*)PL_rsfp == PerlIO_stdin())
323 PerlIO_clearerr(PL_rsfp);
325 (void)PerlIO_close(PL_rsfp);
330 /* not at end of file, so we only read another line */
331 /* make corresponding updates to old pointers, for yyerror() */
332 oldprevlen = PL_oldbufptr - PL_bufend;
333 oldoldprevlen = PL_oldoldbufptr - PL_bufend;
335 oldunilen = PL_last_uni - PL_bufend;
337 oldloplen = PL_last_lop - PL_bufend;
338 PL_linestart = PL_bufptr = s + prevlen;
339 PL_bufend = s + SvCUR(PL_linestr);
341 PL_oldbufptr = s + oldprevlen;
342 PL_oldoldbufptr = s + oldoldprevlen;
344 PL_last_uni = s + oldunilen;
346 PL_last_lop = s + oldloplen;
349 /* debugger active and we're not compiling the debugger code,
350 * so store the line into the debugger's array of lines
352 if (PERLDB_LINE && PL_curstash != PL_debstash) {
353 SV * const sv = NEWSV(85,0);
355 sv_upgrade(sv, SVt_PVMG);
356 sv_setpvn(sv,PL_bufptr,PL_bufend-PL_bufptr);
359 av_store(CopFILEAV(PL_curcop),(I32)CopLINE(PL_curcop),sv);
365 S_scan_word(pTHX_ register char *s, char *dest, STRLEN destlen, int allow_package, STRLEN *slp)
367 register char *d = dest;
368 register char * const e = d + destlen - 3; /* two-character token, ending NUL */
371 Perl_croak(aTHX_ ident_too_long);
372 if (isALNUM(*s)) /* UTF handled below */
374 else if (*s == '\'' && allow_package && isIDFIRST_lazy_if(s+1,UTF)) {
379 else if (*s == ':' && s[1] == ':' && allow_package && s[2] != '$') {
383 else if (UTF && UTF8_IS_START(*s) && isALNUM_utf8((U8*)s)) {
384 char *t = s + UTF8SKIP(s);
385 while (UTF8_IS_CONTINUED(*t) && is_utf8_mark((U8*)t))
388 Perl_croak(aTHX_ ident_too_long);
389 Copy(s, d, t - s, char);
403 * This subroutine has nothing to do with tilting, whether at windmills
404 * or pinball tables. Its name is short for "increment line". It
405 * increments the current line number in CopLINE(PL_curcop) and checks
406 * to see whether the line starts with a comment of the form
407 * # line 500 "foo.pm"
408 * If so, it sets the current line number and file to the values in the comment.
412 S_incline(pTHX_ char *s)
419 CopLINE_inc(PL_curcop);
422 while (SPACE_OR_TAB(*s)) s++;
423 if (strnEQ(s, "line", 4))
427 if (SPACE_OR_TAB(*s))
431 while (SPACE_OR_TAB(*s)) s++;
437 while (SPACE_OR_TAB(*s))
439 if (*s == '"' && (t = strchr(s+1, '"'))) {
444 for (t = s; !isSPACE(*t); t++) ;
447 while (SPACE_OR_TAB(*e) || *e == '\r' || *e == '\f')
449 if (*e != '\n' && *e != '\0')
450 return; /* false alarm */
455 /* this chunk was added to S_incline during 5.8.8. I don't know why but I don't
456 honestly care since I probably want to be bug-compatible anyway (mst) */
458 /* ... my kingdom for a perl parser in perl ... (mst) */
460 #ifdef PERL_5_8_8_PLUS
462 const char *cf = CopFILE(PL_curcop);
463 if (cf && strlen(cf) > 7 && strnEQ(cf, "(eval ", 6)) {
464 /* must copy *{"::_<(eval N)[oldfilename:L]"}
465 * to *{"::_<newfilename"} */
466 char smallbuf[256], smallbuf2[256];
467 char *tmpbuf, *tmpbuf2;
469 STRLEN tmplen = strlen(cf);
470 STRLEN tmplen2 = strlen(s);
471 if (tmplen + 3 < sizeof smallbuf)
474 Newx(tmpbuf, tmplen + 3, char);
475 if (tmplen2 + 3 < sizeof smallbuf2)
478 Newx(tmpbuf2, tmplen2 + 3, char);
479 tmpbuf[0] = tmpbuf2[0] = '_';
480 tmpbuf[1] = tmpbuf2[1] = '<';
481 memcpy(tmpbuf + 2, cf, ++tmplen);
482 memcpy(tmpbuf2 + 2, s, ++tmplen2);
484 gvp = (GV**)hv_fetch(PL_defstash, tmpbuf, tmplen, FALSE);
486 gv2 = *(GV**)hv_fetch(PL_defstash, tmpbuf2, tmplen2, TRUE);
488 gv_init(gv2, PL_defstash, tmpbuf2, tmplen2, FALSE);
489 /* adjust ${"::_<newfilename"} to store the new file name */
490 GvSV(gv2) = newSVpvn(tmpbuf2 + 2, tmplen2 - 2);
491 GvHV(gv2) = (HV*)SvREFCNT_inc(GvHV(*gvp));
492 GvAV(gv2) = (AV*)SvREFCNT_inc(GvAV(*gvp));
494 if (tmpbuf != smallbuf) Safefree(tmpbuf);
495 if (tmpbuf2 != smallbuf2) Safefree(tmpbuf2);
499 /* second endif closes out the "are we 5.8.(8+)" conditional */
500 CopFILE_free(PL_curcop);
501 CopFILE_set(PL_curcop, s);
504 CopLINE_set(PL_curcop, atoi(n)-1);
508 takes: start position in buffer
509 keep_quoted preserve \ on the embedded delimiter(s)
510 keep_delims preserve the delimiters around the string
511 returns: position to continue reading from buffer
512 side-effects: multi_start, multi_close, lex_repl or lex_stuff, and
513 updates the read buffer.
515 This subroutine pulls a string out of the input. It is called for:
516 q single quotes q(literal text)
517 ' single quotes 'literal text'
518 qq double quotes qq(interpolate $here please)
519 " double quotes "interpolate $here please"
520 qx backticks qx(/bin/ls -l)
521 ` backticks `/bin/ls -l`
522 qw quote words @EXPORT_OK = qw( func() $spam )
523 m// regexp match m/this/
524 s/// regexp substitute s/this/that/
525 tr/// string transliterate tr/this/that/
526 y/// string transliterate y/this/that/
527 ($*@) sub prototypes sub foo ($)
528 (stuff) sub attr parameters sub foo : attr(stuff)
529 <> readline or globs <FOO>, <>, <$fh>, or <*.c>
531 In most of these cases (all but <>, patterns and transliterate)
532 yylex() calls scan_str(). m// makes yylex() call scan_pat() which
533 calls scan_str(). s/// makes yylex() call scan_subst() which calls
534 scan_str(). tr/// and y/// make yylex() call scan_trans() which
537 It skips whitespace before the string starts, and treats the first
538 character as the delimiter. If the delimiter is one of ([{< then
539 the corresponding "close" character )]}> is used as the closing
540 delimiter. It allows quoting of delimiters, and if the string has
541 balanced delimiters ([{<>}]) it allows nesting.
543 On success, the SV with the resulting string is put into lex_stuff or,
544 if that is already non-NULL, into lex_repl. The second case occurs only
545 when parsing the RHS of the special constructs s/// and tr/// (y///).
546 For convenience, the terminating delimiter character is stuffed into
551 S_scan_str(pTHX_ char *start, int keep_quoted, int keep_delims)
553 SV *sv; /* scalar value: string */
554 char *tmps; /* temp string, used for delimiter matching */
555 register char *s = start; /* current position in the buffer */
556 register char term; /* terminating character */
557 register char *to; /* current position in the sv's data */
558 I32 brackets = 1; /* bracket nesting level */
559 bool has_utf8 = FALSE; /* is there any utf8 content? */
560 I32 termcode; /* terminating char. code */
561 /* 5.8.7+ uses UTF8_MAXBYTES but also its utf8.h defs _MAXLEN to it so
562 I'm reasonably hopeful this won't destroy anything (mst) */
563 U8 termstr[UTF8_MAXLEN]; /* terminating string */
564 STRLEN termlen; /* length of terminating string */
565 char *last = NULL; /* last position for nesting bracket */
567 /* skip space before the delimiter */
571 /* mark where we are, in case we need to report errors */
574 /* after skipping whitespace, the next character is the terminator */
577 termcode = termstr[0] = term;
581 termcode = utf8_to_uvchr((U8*)s, &termlen);
582 Copy(s, termstr, termlen, U8);
583 if (!UTF8_IS_INVARIANT(term))
587 /* mark where we are */
588 PL_multi_start = CopLINE(PL_curcop);
589 PL_multi_open = term;
591 /* find corresponding closing delimiter */
592 if (term && (tmps = strchr("([{< )]}> )]}>",term)))
593 termcode = termstr[0] = term = tmps[5];
595 PL_multi_close = term;
597 /* create a new SV to hold the contents. 87 is leak category, I'm
598 assuming. 79 is the SV's initial length. What a random number. */
600 sv_upgrade(sv, SVt_PVIV);
601 SvIV_set(sv, termcode);
602 (void)SvPOK_only(sv); /* validate pointer */
604 /* move past delimiter and try to read a complete string */
606 sv_catpvn(sv, s, termlen);
609 if (PL_encoding && !UTF) {
613 int offset = s - SvPVX_const(PL_linestr);
614 const bool found = sv_cat_decode(sv, PL_encoding, PL_linestr,
615 &offset, (char*)termstr, termlen);
616 const char *ns = SvPVX_const(PL_linestr) + offset;
617 char *svlast = SvEND(sv) - 1;
619 for (; s < ns; s++) {
620 if (*s == '\n' && !PL_rsfp)
621 CopLINE_inc(PL_curcop);
626 /* handle quoted delimiters */
627 if (SvCUR(sv) > 1 && *(svlast-1) == '\\') {
629 for (t = svlast-2; t >= SvPVX_const(sv) && *t == '\\';)
631 if ((svlast-1 - t) % 2) {
635 SvCUR_set(sv, SvCUR(sv) - 1);
640 if (PL_multi_open == PL_multi_close) {
648 for (t = w = last; t < svlast; w++, t++) {
649 /* At here, all closes are "was quoted" one,
650 so we don't check PL_multi_close. */
652 if (!keep_quoted && *(t+1) == PL_multi_open)
657 else if (*t == PL_multi_open)
665 SvCUR_set(sv, w - SvPVX_const(sv));
674 SvCUR_set(sv, SvCUR(sv) - 1);
680 /* extend sv if need be */
681 SvGROW(sv, SvCUR(sv) + (PL_bufend - s) + 1);
682 /* set 'to' to the next character in the sv's string */
683 to = SvPVX(sv)+SvCUR(sv);
685 /* if open delimiter is the close delimiter read unbridle */
686 if (PL_multi_open == PL_multi_close) {
687 for (; s < PL_bufend; s++,to++) {
688 /* embedded newlines increment the current line number */
689 if (*s == '\n' && !PL_rsfp)
690 CopLINE_inc(PL_curcop);
691 /* handle quoted delimiters */
692 if (*s == '\\' && s+1 < PL_bufend && term != '\\') {
693 if (!keep_quoted && s[1] == term)
695 /* any other quotes are simply copied straight through */
699 /* terminate when run out of buffer (the for() condition), or
700 have found the terminator */
701 else if (*s == term) {
704 if (s+termlen <= PL_bufend && memEQ(s, (char*)termstr, termlen))
707 else if (!has_utf8 && !UTF8_IS_INVARIANT((U8)*s) && UTF)
713 /* if the terminator isn't the same as the start character (e.g.,
714 matched brackets), we have to allow more in the quoting, and
715 be prepared for nested brackets.
718 /* read until we run out of string, or we find the terminator */
719 for (; s < PL_bufend; s++,to++) {
720 /* embedded newlines increment the line count */
721 if (*s == '\n' && !PL_rsfp)
722 CopLINE_inc(PL_curcop);
723 /* backslashes can escape the open or closing characters */
724 if (*s == '\\' && s+1 < PL_bufend) {
726 ((s[1] == PL_multi_open) || (s[1] == PL_multi_close)))
731 /* allow nested opens and closes */
732 else if (*s == PL_multi_close && --brackets <= 0)
734 else if (*s == PL_multi_open)
736 else if (!has_utf8 && !UTF8_IS_INVARIANT((U8)*s) && UTF)
741 /* terminate the copied string and update the sv's end-of-string */
743 SvCUR_set(sv, to - SvPVX_const(sv));
746 * this next chunk reads more into the buffer if we're not done yet
750 break; /* handle case where we are done yet :-) */
752 #ifndef PERL_STRICT_CR
753 if (to - SvPVX_const(sv) >= 2) {
754 if ((to[-2] == '\r' && to[-1] == '\n') ||
755 (to[-2] == '\n' && to[-1] == '\r'))
759 SvCUR_set(sv, to - SvPVX_const(sv));
761 else if (to[-1] == '\r')
764 else if (to - SvPVX_const(sv) == 1 && to[-1] == '\r')
769 /* if we're out of file, or a read fails, bail and reset the current
770 line marker so we can report where the unterminated string began
773 !(PL_oldoldbufptr = PL_oldbufptr = s = PL_linestart = filter_gets(PL_linestr, PL_rsfp, 0))) {
775 CopLINE_set(PL_curcop, (line_t)PL_multi_start);
778 /* we read a line, so increment our line counter */
779 CopLINE_inc(PL_curcop);
781 /* update debugger info */
782 if (PERLDB_LINE && PL_curstash != PL_debstash) {
783 SV *sv = NEWSV(88,0);
785 sv_upgrade(sv, SVt_PVMG);
786 sv_setsv(sv,PL_linestr);
789 av_store(CopFILEAV(PL_curcop), (I32)CopLINE(PL_curcop), sv);
792 /* having changed the buffer, we must update PL_bufend */
793 PL_bufend = SvPVX(PL_linestr) + SvCUR(PL_linestr);
794 PL_last_lop = PL_last_uni = Nullch;
797 /* at this point, we have successfully read the delimited string */
799 if (!PL_encoding || UTF) {
801 sv_catpvn(sv, s, termlen);
804 if (has_utf8 || PL_encoding)
807 PL_multi_end = CopLINE(PL_curcop);
809 /* if we allocated too much space, give some back */
810 if (SvCUR(sv) + 5 < SvLEN(sv)) {
811 SvLEN_set(sv, SvCUR(sv) + 1);
812 /* 5.8.8 uses SvPV_renew, no prior version actually has the damn thing (mst) */
813 #ifdef PERL_5_8_8_PLUS
814 SvPV_renew(sv, SvLEN(sv));
816 Renew(SvPVX(sv), SvLEN(sv), char);
820 /* decide whether this is the first or second quoted string we've read
833 * When the lexer realizes it knows the next token (for instance,
834 * it is reordering tokens for the parser) then it can call S_force_next
835 * to know what token to return the next time the lexer is called. Caller
836 * will need to set PL_nextval[], and possibly PL_expect to ensure the lexer
837 * handles the token correctly.
841 S_force_next(pTHX_ I32 type)
843 PL_nexttype[PL_nexttoke] = type;
845 if (PL_lex_state != LEX_KNOWNEXT) {
846 PL_lex_defer = PL_lex_state;
847 PL_lex_expect = PL_expect;
848 PL_lex_state = LEX_KNOWNEXT;