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)
27 #define scan_ident(a,b,c,d,e) S_scan_ident(aTHX_ a,b,c,d,e)
29 STATIC void S_incline(pTHX_ char *s);
30 STATIC char* S_skipspace(pTHX_ char *s);
31 STATIC char * S_filter_gets(pTHX_ SV *sv, PerlIO *fp, STRLEN append);
32 STATIC char* S_scan_str(pTHX_ char *start, int keep_quoted, int keep_delims);
33 STATIC char* S_scan_word(pTHX_ char *s, char *dest, STRLEN destlen, int allow_package, STRLEN *slp);
35 #define DPTR2FPTR(t,p) ((t)PTR2nat(p)) /* data pointer to function pointer */
36 #define FPTR2DPTR(t,p) ((t)PTR2nat(p)) /* function pointer to data pointer */
37 #define PTR2nat(p) (PTRV)(p) /* pointer to integer of PTRSIZE */
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)))
47 #ifndef MEM_WRAP_CHECK_
48 #define MEM_WRAP_CHECK_(n,t) MEM_WRAP_CHECK(n,t),
51 #define SvPV_renew(sv,n) \
52 STMT_START { SvLEN_set(sv, n); \
53 SvPV_set((sv), (MEM_WRAP_CHECK_(n,char) \
54 (char*)saferealloc((Malloc_t)SvPVX(sv), \
58 #define isCONTROLVAR(x) (isUPPER(x) || strchr("[\\]^_?", (x)))
60 /* On MacOS, respect nonbreaking spaces */
61 #ifdef MACOS_TRADITIONAL
62 #define SPACE_OR_TAB(c) ((c)==' '||(c)=='\312'||(c)=='\t')
64 #define SPACE_OR_TAB(c) ((c)==' '||(c)=='\t')
67 #define CLINE (PL_copline = (CopLINE(PL_curcop) < PL_copline ? CopLINE(PL_curcop) : PL_copline))
69 #define LEX_NORMAL 10 /* normal code (ie not within "...") */
70 #define LEX_INTERPNORMAL 9 /* code within a string, eg "$foo[$x+1]" */
71 #define LEX_INTERPCASEMOD 8 /* expecting a \U, \Q or \E etc */
72 #define LEX_INTERPPUSH 7 /* starting a new sublex parse level */
73 #define LEX_INTERPSTART 6 /* expecting the start of a $var */
75 /* at end of code, eg "$x" followed by: */
76 #define LEX_INTERPEND 5 /* ... eg not one of [, { or -> */
77 #define LEX_INTERPENDMAYBE 4 /* ... eg one of [, { or -> */
79 #define LEX_INTERPCONCAT 3 /* expecting anything, eg at start of
80 string or after \E, $foo, etc */
81 #define LEX_INTERPCONST 2 /* NOT USED */
82 #define LEX_FORMLINE 1 /* expecting a format line */
83 #define LEX_KNOWNEXT 0 /* next token known; just return it */
85 /* and these two are my own madness (mst) */
87 #if PERL_REVISION == 5 && PERL_VERSION == 8 && PERL_SUBVERSION >= 8
88 #define PERL_5_8_8_PLUS
91 #if PERL_REVISION == 5 && PERL_VERSION > 8
96 /* 5.9+ moves a bunch of things to a PL_parser struct so we need to
97 declare the backcompat macros for things to still work (mst) */
99 /* XXX temporary backwards compatibility */
100 #define PL_lex_brackets (PL_parser->lex_brackets)
101 #define PL_lex_brackstack (PL_parser->lex_brackstack)
102 #define PL_lex_casemods (PL_parser->lex_casemods)
103 #define PL_lex_casestack (PL_parser->lex_casestack)
104 #define PL_lex_defer (PL_parser->lex_defer)
105 #define PL_lex_dojoin (PL_parser->lex_dojoin)
106 #define PL_lex_expect (PL_parser->lex_expect)
107 #define PL_lex_formbrack (PL_parser->lex_formbrack)
108 #define PL_lex_inpat (PL_parser->lex_inpat)
109 #define PL_lex_inwhat (PL_parser->lex_inwhat)
110 #define PL_lex_op (PL_parser->lex_op)
111 #define PL_lex_repl (PL_parser->lex_repl)
112 #define PL_lex_starts (PL_parser->lex_starts)
113 #define PL_lex_stuff (PL_parser->lex_stuff)
114 #define PL_multi_start (PL_parser->multi_start)
115 #define PL_multi_open (PL_parser->multi_open)
116 #define PL_multi_close (PL_parser->multi_close)
117 #define PL_pending_ident (PL_parser->pending_ident)
118 #define PL_preambled (PL_parser->preambled)
119 #define PL_sublex_info (PL_parser->sublex_info)
120 #define PL_linestr (PL_parser->linestr)
121 #define PL_sublex_info (PL_parser->sublex_info)
122 #define PL_linestr (PL_parser->linestr)
123 #define PL_expect (PL_parser->expect)
124 #define PL_copline (PL_parser->copline)
125 #define PL_bufptr (PL_parser->bufptr)
126 #define PL_oldbufptr (PL_parser->oldbufptr)
127 #define PL_oldoldbufptr (PL_parser->oldoldbufptr)
128 #define PL_linestart (PL_parser->linestart)
129 #define PL_bufend (PL_parser->bufend)
130 #define PL_last_uni (PL_parser->last_uni)
131 #define PL_last_lop (PL_parser->last_lop)
132 #define PL_last_lop_op (PL_parser->last_lop_op)
133 #define PL_lex_state (PL_parser->lex_state)
134 #define PL_rsfp (PL_parser->rsfp)
135 #define PL_rsfp_filters (PL_parser->rsfp_filters)
136 #define PL_in_my (PL_parser->in_my)
137 #define PL_in_my_stash (PL_parser->in_my_stash)
138 #define PL_tokenbuf (PL_parser->tokenbuf)
139 #define PL_multi_end (PL_parser->multi_end)
140 #define PL_error_count (PL_parser->error_count)
141 #define PL_nexttoke (PL_parser->nexttoke)
142 /* these are from the non-PERL_MAD path but I don't -think- I need
143 the PERL_MAD stuff since my code isn't really populating things (mst) */
145 # define PL_curforce (PL_parser->curforce)
146 # define PL_lasttoke (PL_parser->lasttoke)
148 # define PL_nexttype (PL_parser->nexttype)
149 # define PL_nextval (PL_parser->nextval)
151 /* end of backcompat macros from 5.9 toke.c (mst) */
154 /* when ccflags include -DDEBUGGING we need this for earlier 5.8 perls */
155 #ifndef SvPV_nolen_const
156 #define SvPV_nolen_const SvPV_nolen
159 /* and now we're back to the toke.c stuff again (mst) */
161 static const char ident_too_long[] =
162 "Identifier too long";
163 static const char c_without_g[] =
164 "Use of /c modifier is meaningless without /g";
165 static const char c_in_subst[] =
166 "Use of /c modifier is meaningless in s///";
168 #ifdef USE_UTF8_SCRIPTS
169 # define UTF (!IN_BYTES)
171 # define UTF ((PL_linestr && DO_UTF8(PL_linestr)) || (PL_hints & HINT_UTF8))
174 /* Invoke the idxth filter function for the current rsfp. */
175 /* maxlen 0 = read one text line */
177 Perl_filter_read(pTHX_ int idx, SV *buf_sv, int maxlen)
182 if (!PL_rsfp_filters)
184 if (idx > AvFILLp(PL_rsfp_filters)) { /* Any more filters? */
185 /* Provide a default input filter to make life easy. */
186 /* Note that we append to the line. This is handy. */
187 DEBUG_P(PerlIO_printf(Perl_debug_log,
188 "filter_read %d: from rsfp\n", idx));
192 const int old_len = SvCUR(buf_sv);
194 /* ensure buf_sv is large enough */
195 SvGROW(buf_sv, (STRLEN)(old_len + maxlen)) ;
196 if ((len = PerlIO_read(PL_rsfp, SvPVX(buf_sv) + old_len, maxlen)) <= 0){
197 if (PerlIO_error(PL_rsfp))
198 return -1; /* error */
200 return 0 ; /* end of file */
202 SvCUR_set(buf_sv, old_len + len) ;
205 if (sv_gets(buf_sv, PL_rsfp, SvCUR(buf_sv)) == NULL) {
206 if (PerlIO_error(PL_rsfp))
207 return -1; /* error */
209 return 0 ; /* end of file */
212 return SvCUR(buf_sv);
214 /* Skip this filter slot if filter has been deleted */
215 if ( (datasv = FILTER_DATA(idx)) == &PL_sv_undef) {
216 DEBUG_P(PerlIO_printf(Perl_debug_log,
217 "filter_read %d: skipped (filter deleted)\n",
219 return FILTER_READ(idx+1, buf_sv, maxlen); /* recurse */
221 /* Get function pointer hidden within datasv */
222 funcp = DPTR2FPTR(filter_t, IoANY(datasv));
223 DEBUG_P(PerlIO_printf(Perl_debug_log,
224 "filter_read %d: via function %p (%s)\n",
225 idx, datasv, SvPV_nolen_const(datasv)));
226 /* Call function. The function is expected to */
227 /* call "FILTER_READ(idx+1, buf_sv)" first. */
228 /* Return: <0:error, =0:eof, >0:not eof */
229 return (*funcp)(aTHX_ idx, buf_sv, maxlen);
233 S_filter_gets(pTHX_ register SV *sv, register PerlIO *fp, STRLEN append)
235 #ifdef PERL_CR_FILTER
236 if (!PL_rsfp_filters) {
237 filter_add(S_cr_textfilter,NULL);
240 if (PL_rsfp_filters) {
242 SvCUR_set(sv, 0); /* start with empty line */
243 if (FILTER_READ(0, sv, 0) > 0)
244 return ( SvPVX(sv) ) ;
249 return (sv_gets(sv, fp, append));
254 * Called to gobble the appropriate amount and type of whitespace.
255 * Skips comments as well.
259 S_skipspace(pTHX_ register char *s)
261 if (PL_lex_formbrack && PL_lex_brackets <= PL_lex_formbrack) {
262 while (s < PL_bufend && SPACE_OR_TAB(*s))
268 SSize_t oldprevlen, oldoldprevlen;
269 SSize_t oldloplen = 0, oldunilen = 0;
270 while (s < PL_bufend && isSPACE(*s)) {
271 if (*s++ == '\n' && PL_in_eval && !PL_rsfp)
276 if (s < PL_bufend && *s == '#') {
277 while (s < PL_bufend && *s != '\n')
281 if (PL_in_eval && !PL_rsfp) {
288 /* only continue to recharge the buffer if we're at the end
289 * of the buffer, we're not reading from a source filter, and
290 * we're in normal lexing mode
292 if (s < PL_bufend || !PL_rsfp || PL_sublex_info.sub_inwhat ||
293 PL_lex_state == LEX_FORMLINE)
296 /* try to recharge the buffer */
297 if ((s = filter_gets(PL_linestr, PL_rsfp,
298 (prevlen = SvCUR(PL_linestr)))) == Nullch)
300 /* end of file. Add on the -p or -n magic */
303 ";}continue{print or die qq(-p destination: $!\\n);}");
304 PL_minus_n = PL_minus_p = 0;
306 else if (PL_minus_n) {
307 sv_setpvn(PL_linestr, ";}", 2);
311 sv_setpvn(PL_linestr,";", 1);
313 /* reset variables for next time we lex */
314 PL_oldoldbufptr = PL_oldbufptr = PL_bufptr = s = PL_linestart
316 PL_bufend = SvPVX(PL_linestr) + SvCUR(PL_linestr);
317 PL_last_lop = PL_last_uni = Nullch;
319 /* In perl versions previous to p4-rawid: //depot/perl@32954 -P
320 * preprocessors were supported here. We don't support -P at all, even
321 * on perls that support it, and use the following chunk from blead
325 /* Close the filehandle. Could be from
326 * STDIN, or a regular file. If we were reading code from
327 * STDIN (because the commandline held no -e or filename)
328 * then we don't close it, we reset it so the code can
329 * read from STDIN too.
332 if ((PerlIO*)PL_rsfp == PerlIO_stdin())
333 PerlIO_clearerr(PL_rsfp);
335 (void)PerlIO_close(PL_rsfp);
340 /* not at end of file, so we only read another line */
341 /* make corresponding updates to old pointers, for yyerror() */
342 oldprevlen = PL_oldbufptr - PL_bufend;
343 oldoldprevlen = PL_oldoldbufptr - PL_bufend;
345 oldunilen = PL_last_uni - PL_bufend;
347 oldloplen = PL_last_lop - PL_bufend;
348 PL_linestart = PL_bufptr = s + prevlen;
349 PL_bufend = s + SvCUR(PL_linestr);
351 PL_oldbufptr = s + oldprevlen;
352 PL_oldoldbufptr = s + oldoldprevlen;
354 PL_last_uni = s + oldunilen;
356 PL_last_lop = s + oldloplen;
359 /* debugger active and we're not compiling the debugger code,
360 * so store the line into the debugger's array of lines
362 if (PERLDB_LINE && PL_curstash != PL_debstash) {
363 SV * const sv = NEWSV(85,0);
365 sv_upgrade(sv, SVt_PVMG);
366 sv_setpvn(sv,PL_bufptr,PL_bufend-PL_bufptr);
369 av_store(CopFILEAV(PL_curcop),(I32)CopLINE(PL_curcop),sv);
375 S_scan_word(pTHX_ register char *s, char *dest, STRLEN destlen, int allow_package, STRLEN *slp)
377 register char *d = dest;
378 register char * const e = d + destlen - 3; /* two-character token, ending NUL */
381 Perl_croak(aTHX_ ident_too_long);
382 if (isALNUM(*s)) /* UTF handled below */
384 else if (*s == '\'' && allow_package && isIDFIRST_lazy_if(s+1,UTF)) {
389 else if (*s == ':' && s[1] == ':' && allow_package && s[2] != '$') {
393 else if (UTF && UTF8_IS_START(*s) && isALNUM_utf8((U8*)s)) {
394 char *t = s + UTF8SKIP(s);
395 while (UTF8_IS_CONTINUED(*t) && is_utf8_mark((U8*)t))
398 Perl_croak(aTHX_ ident_too_long);
399 Copy(s, d, t - s, char);
413 * This subroutine has nothing to do with tilting, whether at windmills
414 * or pinball tables. Its name is short for "increment line". It
415 * increments the current line number in CopLINE(PL_curcop) and checks
416 * to see whether the line starts with a comment of the form
417 * # line 500 "foo.pm"
418 * If so, it sets the current line number and file to the values in the comment.
422 S_incline(pTHX_ char *s)
429 CopLINE_inc(PL_curcop);
432 while (SPACE_OR_TAB(*s)) s++;
433 if (strnEQ(s, "line", 4))
437 if (SPACE_OR_TAB(*s))
441 while (SPACE_OR_TAB(*s)) s++;
447 while (SPACE_OR_TAB(*s))
449 if (*s == '"' && (t = strchr(s+1, '"'))) {
454 for (t = s; !isSPACE(*t); t++) ;
457 while (SPACE_OR_TAB(*e) || *e == '\r' || *e == '\f')
459 if (*e != '\n' && *e != '\0')
460 return; /* false alarm */
465 /* this chunk was added to S_incline during 5.8.8. I don't know why but I don't
466 honestly care since I probably want to be bug-compatible anyway (mst) */
468 /* ... my kingdom for a perl parser in perl ... (mst) */
470 #ifdef PERL_5_8_8_PLUS
472 const char *cf = CopFILE(PL_curcop);
473 if (cf && strlen(cf) > 7 && strnEQ(cf, "(eval ", 6)) {
474 /* must copy *{"::_<(eval N)[oldfilename:L]"}
475 * to *{"::_<newfilename"} */
476 char smallbuf[256], smallbuf2[256];
477 char *tmpbuf, *tmpbuf2;
479 STRLEN tmplen = strlen(cf);
480 STRLEN tmplen2 = strlen(s);
481 if (tmplen + 3 < sizeof smallbuf)
484 Newx(tmpbuf, tmplen + 3, char);
485 if (tmplen2 + 3 < sizeof smallbuf2)
488 Newx(tmpbuf2, tmplen2 + 3, char);
489 tmpbuf[0] = tmpbuf2[0] = '_';
490 tmpbuf[1] = tmpbuf2[1] = '<';
491 memcpy(tmpbuf + 2, cf, ++tmplen);
492 memcpy(tmpbuf2 + 2, s, ++tmplen2);
494 gvp = (GV**)hv_fetch(PL_defstash, tmpbuf, tmplen, FALSE);
496 gv2 = *(GV**)hv_fetch(PL_defstash, tmpbuf2, tmplen2, TRUE);
498 gv_init(gv2, PL_defstash, tmpbuf2, tmplen2, FALSE);
499 /* adjust ${"::_<newfilename"} to store the new file name */
500 GvSV(gv2) = newSVpvn(tmpbuf2 + 2, tmplen2 - 2);
501 GvHV(gv2) = (HV*)SvREFCNT_inc(GvHV(*gvp));
502 GvAV(gv2) = (AV*)SvREFCNT_inc(GvAV(*gvp));
504 if (tmpbuf != smallbuf) Safefree(tmpbuf);
505 if (tmpbuf2 != smallbuf2) Safefree(tmpbuf2);
509 /* second endif closes out the "are we 5.8.(8+)" conditional */
510 CopFILE_free(PL_curcop);
511 CopFILE_set(PL_curcop, s);
514 CopLINE_set(PL_curcop, atoi(n)-1);
518 takes: start position in buffer
519 keep_quoted preserve \ on the embedded delimiter(s)
520 keep_delims preserve the delimiters around the string
521 returns: position to continue reading from buffer
522 side-effects: multi_start, multi_close, lex_repl or lex_stuff, and
523 updates the read buffer.
525 This subroutine pulls a string out of the input. It is called for:
526 q single quotes q(literal text)
527 ' single quotes 'literal text'
528 qq double quotes qq(interpolate $here please)
529 " double quotes "interpolate $here please"
530 qx backticks qx(/bin/ls -l)
531 ` backticks `/bin/ls -l`
532 qw quote words @EXPORT_OK = qw( func() $spam )
533 m// regexp match m/this/
534 s/// regexp substitute s/this/that/
535 tr/// string transliterate tr/this/that/
536 y/// string transliterate y/this/that/
537 ($*@) sub prototypes sub foo ($)
538 (stuff) sub attr parameters sub foo : attr(stuff)
539 <> readline or globs <FOO>, <>, <$fh>, or <*.c>
541 In most of these cases (all but <>, patterns and transliterate)
542 yylex() calls scan_str(). m// makes yylex() call scan_pat() which
543 calls scan_str(). s/// makes yylex() call scan_subst() which calls
544 scan_str(). tr/// and y/// make yylex() call scan_trans() which
547 It skips whitespace before the string starts, and treats the first
548 character as the delimiter. If the delimiter is one of ([{< then
549 the corresponding "close" character )]}> is used as the closing
550 delimiter. It allows quoting of delimiters, and if the string has
551 balanced delimiters ([{<>}]) it allows nesting.
553 On success, the SV with the resulting string is put into lex_stuff or,
554 if that is already non-NULL, into lex_repl. The second case occurs only
555 when parsing the RHS of the special constructs s/// and tr/// (y///).
556 For convenience, the terminating delimiter character is stuffed into
561 S_scan_str(pTHX_ char *start, int keep_quoted, int keep_delims)
563 SV *sv; /* scalar value: string */
564 char *tmps; /* temp string, used for delimiter matching */
565 register char *s = start; /* current position in the buffer */
566 register char term; /* terminating character */
567 register char *to; /* current position in the sv's data */
568 I32 brackets = 1; /* bracket nesting level */
569 bool has_utf8 = FALSE; /* is there any utf8 content? */
570 I32 termcode; /* terminating char. code */
571 /* 5.8.7+ uses UTF8_MAXBYTES but also its utf8.h defs _MAXLEN to it so
572 I'm reasonably hopeful this won't destroy anything (mst) */
573 U8 termstr[UTF8_MAXLEN]; /* terminating string */
574 STRLEN termlen; /* length of terminating string */
575 char *last = NULL; /* last position for nesting bracket */
577 /* skip space before the delimiter */
581 /* mark where we are, in case we need to report errors */
584 /* after skipping whitespace, the next character is the terminator */
587 termcode = termstr[0] = term;
591 termcode = utf8_to_uvchr((U8*)s, &termlen);
592 Copy(s, termstr, termlen, U8);
593 if (!UTF8_IS_INVARIANT(term))
597 /* mark where we are */
598 PL_multi_start = CopLINE(PL_curcop);
599 PL_multi_open = term;
601 /* find corresponding closing delimiter */
602 if (term && (tmps = strchr("([{< )]}> )]}>",term)))
603 termcode = termstr[0] = term = tmps[5];
605 PL_multi_close = term;
607 /* create a new SV to hold the contents. 87 is leak category, I'm
608 assuming. 79 is the SV's initial length. What a random number. */
610 sv_upgrade(sv, SVt_PVIV);
611 SvIV_set(sv, termcode);
612 (void)SvPOK_only(sv); /* validate pointer */
614 /* move past delimiter and try to read a complete string */
616 sv_catpvn(sv, s, termlen);
619 if (PL_encoding && !UTF) {
623 int offset = s - SvPVX_const(PL_linestr);
624 const bool found = sv_cat_decode(sv, PL_encoding, PL_linestr,
625 &offset, (char*)termstr, termlen);
626 const char *ns = SvPVX_const(PL_linestr) + offset;
627 char *svlast = SvEND(sv) - 1;
629 for (; s < ns; s++) {
630 if (*s == '\n' && !PL_rsfp)
631 CopLINE_inc(PL_curcop);
636 /* handle quoted delimiters */
637 if (SvCUR(sv) > 1 && *(svlast-1) == '\\') {
639 for (t = svlast-2; t >= SvPVX_const(sv) && *t == '\\';)
641 if ((svlast-1 - t) % 2) {
645 SvCUR_set(sv, SvCUR(sv) - 1);
650 if (PL_multi_open == PL_multi_close) {
658 for (t = w = last; t < svlast; w++, t++) {
659 /* At here, all closes are "was quoted" one,
660 so we don't check PL_multi_close. */
662 if (!keep_quoted && *(t+1) == PL_multi_open)
667 else if (*t == PL_multi_open)
675 SvCUR_set(sv, w - SvPVX_const(sv));
684 SvCUR_set(sv, SvCUR(sv) - 1);
690 /* extend sv if need be */
691 SvGROW(sv, SvCUR(sv) + (PL_bufend - s) + 1);
692 /* set 'to' to the next character in the sv's string */
693 to = SvPVX(sv)+SvCUR(sv);
695 /* if open delimiter is the close delimiter read unbridle */
696 if (PL_multi_open == PL_multi_close) {
697 for (; s < PL_bufend; s++,to++) {
698 /* embedded newlines increment the current line number */
699 if (*s == '\n' && !PL_rsfp)
700 CopLINE_inc(PL_curcop);
701 /* handle quoted delimiters */
702 if (*s == '\\' && s+1 < PL_bufend && term != '\\') {
703 if (!keep_quoted && s[1] == term)
705 /* any other quotes are simply copied straight through */
709 /* terminate when run out of buffer (the for() condition), or
710 have found the terminator */
711 else if (*s == term) {
714 if (s+termlen <= PL_bufend && memEQ(s, (char*)termstr, termlen))
717 else if (!has_utf8 && !UTF8_IS_INVARIANT((U8)*s) && UTF)
723 /* if the terminator isn't the same as the start character (e.g.,
724 matched brackets), we have to allow more in the quoting, and
725 be prepared for nested brackets.
728 /* read until we run out of string, or we find the terminator */
729 for (; s < PL_bufend; s++,to++) {
730 /* embedded newlines increment the line count */
731 if (*s == '\n' && !PL_rsfp)
732 CopLINE_inc(PL_curcop);
733 /* backslashes can escape the open or closing characters */
734 if (*s == '\\' && s+1 < PL_bufend) {
736 ((s[1] == PL_multi_open) || (s[1] == PL_multi_close)))
741 /* allow nested opens and closes */
742 else if (*s == PL_multi_close && --brackets <= 0)
744 else if (*s == PL_multi_open)
746 else if (!has_utf8 && !UTF8_IS_INVARIANT((U8)*s) && UTF)
751 /* terminate the copied string and update the sv's end-of-string */
753 SvCUR_set(sv, to - SvPVX_const(sv));
756 * this next chunk reads more into the buffer if we're not done yet
760 break; /* handle case where we are done yet :-) */
762 #ifndef PERL_STRICT_CR
763 if (to - SvPVX_const(sv) >= 2) {
764 if ((to[-2] == '\r' && to[-1] == '\n') ||
765 (to[-2] == '\n' && to[-1] == '\r'))
769 SvCUR_set(sv, to - SvPVX_const(sv));
771 else if (to[-1] == '\r')
774 else if (to - SvPVX_const(sv) == 1 && to[-1] == '\r')
779 /* if we're out of file, or a read fails, bail and reset the current
780 line marker so we can report where the unterminated string began
783 !(PL_oldoldbufptr = PL_oldbufptr = s = PL_linestart = filter_gets(PL_linestr, PL_rsfp, 0))) {
785 CopLINE_set(PL_curcop, (line_t)PL_multi_start);
788 /* we read a line, so increment our line counter */
789 CopLINE_inc(PL_curcop);
791 /* update debugger info */
792 if (PERLDB_LINE && PL_curstash != PL_debstash) {
793 SV *sv = NEWSV(88,0);
795 sv_upgrade(sv, SVt_PVMG);
796 sv_setsv(sv,PL_linestr);
799 av_store(CopFILEAV(PL_curcop), (I32)CopLINE(PL_curcop), sv);
802 /* having changed the buffer, we must update PL_bufend */
803 PL_bufend = SvPVX(PL_linestr) + SvCUR(PL_linestr);
804 PL_last_lop = PL_last_uni = Nullch;
807 /* at this point, we have successfully read the delimited string */
809 if (!PL_encoding || UTF) {
811 sv_catpvn(sv, s, termlen);
814 if (has_utf8 || PL_encoding)
817 PL_multi_end = CopLINE(PL_curcop);
819 /* if we allocated too much space, give some back */
820 if (SvCUR(sv) + 5 < SvLEN(sv)) {
821 SvLEN_set(sv, SvCUR(sv) + 1);
822 /* 5.8.8 uses SvPV_renew, no prior version actually has the damn thing (mst) */
823 #ifdef PERL_5_8_8_PLUS
824 SvPV_renew(sv, SvLEN(sv));
826 Renew(SvPVX(sv), SvLEN(sv), char);
830 /* decide whether this is the first or second quoted string we've read
843 * When the lexer realizes it knows the next token (for instance,
844 * it is reordering tokens for the parser) then it can call S_force_next
845 * to know what token to return the next time the lexer is called. Caller
846 * will need to set PL_nextval[], and possibly PL_expect to ensure the lexer
847 * handles the token correctly.
851 S_force_next(pTHX_ I32 type)
856 start_force(PL_lasttoke);
857 PL_nexttoke[PL_curforce].next_type = type;
858 if (PL_lex_state != LEX_KNOWNEXT)
859 PL_lex_defer = PL_lex_state;
860 PL_lex_state = LEX_KNOWNEXT;
861 PL_lex_expect = PL_expect;
864 PL_nexttype[PL_nexttoke] = type;
866 if (PL_lex_state != LEX_KNOWNEXT) {
867 PL_lex_defer = PL_lex_state;
868 PL_lex_expect = PL_expect;
869 PL_lex_state = LEX_KNOWNEXT;
874 #define XFAKEBRACK 128
877 S_scan_ident(pTHX_ register char *s, register const char *send, char *dest, STRLEN destlen, I32 ck_uni)
881 char *bracket = Nullch;
887 e = d + destlen - 3; /* two-character token, ending NUL */
889 while (isDIGIT(*s)) {
891 Perl_croak(aTHX_ ident_too_long);
898 Perl_croak(aTHX_ ident_too_long);
899 if (isALNUM(*s)) /* UTF handled below */
901 else if (*s == '\'' && isIDFIRST_lazy_if(s+1,UTF)) {
906 else if (*s == ':' && s[1] == ':') {
910 else if (UTF && UTF8_IS_START(*s) && isALNUM_utf8((U8*)s)) {
911 char *t = s + UTF8SKIP(s);
912 while (UTF8_IS_CONTINUED(*t) && is_utf8_mark((U8*)t))
915 Perl_croak(aTHX_ ident_too_long);
916 Copy(s, d, t - s, char);
927 if (PL_lex_state != LEX_NORMAL)
928 PL_lex_state = LEX_INTERPENDMAYBE;
931 if (*s == '$' && s[1] &&
932 (isALNUM_lazy_if(s+1,UTF) || s[1] == '$' || s[1] == '{' || strnEQ(s+1,"::",2)) )
940 /* we always call this with ck_uni == 0 (rafl) */
948 if (*d == '^' && *s && isCONTROLVAR(*s)) {
953 if (isSPACE(s[-1])) {
955 const char ch = *s++;
956 if (!SPACE_OR_TAB(ch)) {
962 if (isIDFIRST_lazy_if(d,UTF)) {
966 while ((e < send && isALNUM_lazy_if(e,UTF)) || *e == ':') {
968 while (e < send && UTF8_IS_CONTINUED(*e) && is_utf8_mark((U8*)e))
971 Copy(s, d, e - s, char);
976 while ((isALNUM(*s) || *s == ':') && d < e)
979 Perl_croak(aTHX_ ident_too_long);
982 while (s < send && SPACE_OR_TAB(*s)) s++;
983 if ((*s == '[' || (*s == '{' && strNE(dest, "sub")))) {
984 /* we don't want perl to guess what is meant. the keyword
985 * parser decides that later. (rafl)
988 if (ckWARN(WARN_AMBIGUOUS) && keyword(dest, d - dest)) {
989 const char *brack = *s == '[' ? "[...]" : "{...}";
990 Perl_warner(aTHX_ packWARN(WARN_AMBIGUOUS),
991 "Ambiguous use of %c{%s%s} resolved to %c%s%s",
992 funny, dest, brack, funny, dest, brack);
996 PL_lex_brackstack[PL_lex_brackets++] = (char)(XOPERATOR | XFAKEBRACK);
1000 /* Handle extended ${^Foo} variables
1001 * 1999-02-27 mjd-perl-patch@plover.com */
1002 else if (!isALNUM(*d) && !isPRINT(*d) /* isCTRL(d) */
1006 while (isALNUM(*s) && d < e) {
1010 Perl_croak(aTHX_ ident_too_long);
1015 if (PL_lex_state == LEX_INTERPNORMAL && !PL_lex_brackets) {
1016 PL_lex_state = LEX_INTERPEND;
1021 /* we don't want perl to guess what is meant. the keyword
1022 * parser decides that later. (rafl)
1025 if (PL_lex_state == LEX_NORMAL) {
1026 if (ckWARN(WARN_AMBIGUOUS) &&
1027 (keyword(dest, d - dest) || get_cv(dest, FALSE)))
1029 Perl_warner(aTHX_ packWARN(WARN_AMBIGUOUS),
1030 "Ambiguous use of %c{%s} resolved to %c%s",
1031 funny, dest, funny, dest);
1037 s = bracket; /* let the parser handle it */
1041 /* don't intuit. we really just want the string. (rafl) */
1043 else if (PL_lex_state == LEX_INTERPNORMAL && !PL_lex_brackets && !intuit_more(s))
1044 PL_lex_state = LEX_INTERPEND;