Commit | Line | Data |
a0d0e21e |
1 | /* regexec.c |
2 | */ |
3 | |
4 | /* |
5 | * "One Ring to rule them all, One Ring to find them..." |
6 | */ |
7 | |
a687059c |
8 | /* NOTE: this is derived from Henry Spencer's regexp code, and should not |
9 | * confused with the original package (see point 3 below). Thanks, Henry! |
10 | */ |
11 | |
12 | /* Additional note: this code is very heavily munged from Henry's version |
13 | * in places. In some spots I've traded clarity for efficiency, so don't |
14 | * blame Henry for some of the lack of readability. |
15 | */ |
16 | |
e50aee73 |
17 | /* The names of the functions have been changed from regcomp and |
18 | * regexec to pregcomp and pregexec in order to avoid conflicts |
19 | * with the POSIX routines of the same names. |
20 | */ |
21 | |
b9d5759e |
22 | #ifdef PERL_EXT_RE_BUILD |
23 | /* need to replace pregcomp et al, so enable that */ |
24 | # ifndef PERL_IN_XSUB_RE |
25 | # define PERL_IN_XSUB_RE |
26 | # endif |
27 | /* need access to debugger hooks */ |
28 | # ifndef DEBUGGING |
29 | # define DEBUGGING |
30 | # endif |
31 | #endif |
32 | |
33 | #ifdef PERL_IN_XSUB_RE |
d06ea78c |
34 | /* We *really* need to overwrite these symbols: */ |
56953603 |
35 | # define Perl_regexec_flags my_regexec |
36 | # define Perl_regdump my_regdump |
37 | # define Perl_regprop my_regprop |
d06ea78c |
38 | /* *These* symbols are masked to allow static link. */ |
39 | # define Perl_pregexec my_pregexec |
56953603 |
40 | #endif |
41 | |
f0fcb552 |
42 | /*SUPPRESS 112*/ |
a687059c |
43 | /* |
e50aee73 |
44 | * pregcomp and pregexec -- regsub and regerror are not used in perl |
a687059c |
45 | * |
46 | * Copyright (c) 1986 by University of Toronto. |
47 | * Written by Henry Spencer. Not derived from licensed software. |
48 | * |
49 | * Permission is granted to anyone to use this software for any |
50 | * purpose on any computer system, and to redistribute it freely, |
51 | * subject to the following restrictions: |
52 | * |
53 | * 1. The author is not responsible for the consequences of use of |
54 | * this software, no matter how awful, even if they arise |
55 | * from defects in it. |
56 | * |
57 | * 2. The origin of this software must not be misrepresented, either |
58 | * by explicit claim or by omission. |
59 | * |
60 | * 3. Altered versions must be plainly marked as such, and must not |
61 | * be misrepresented as being the original software. |
62 | * |
63 | **** Alterations to Henry's code are... |
64 | **** |
9607fc9c |
65 | **** Copyright (c) 1991-1997, Larry Wall |
a687059c |
66 | **** |
9ef589d8 |
67 | **** You may distribute under the terms of either the GNU General Public |
68 | **** License or the Artistic License, as specified in the README file. |
a687059c |
69 | * |
70 | * Beware that some of this code is subtly aware of the way operator |
71 | * precedence is structured in regular expressions. Serious changes in |
72 | * regular-expression syntax might require a total rethink. |
73 | */ |
74 | #include "EXTERN.h" |
75 | #include "perl.h" |
76 | #include "regcomp.h" |
77 | |
c277df42 |
78 | #define RF_tainted 1 /* tainted information used? */ |
79 | #define RF_warned 2 /* warned about big count? */ |
ce862d02 |
80 | #define RF_evaled 4 /* Did an EVAL with setting? */ |
81 | |
82 | #define RS_init 1 /* eval environment created */ |
83 | #define RS_set 2 /* replsv value is set */ |
c277df42 |
84 | |
a687059c |
85 | #ifndef STATIC |
86 | #define STATIC static |
87 | #endif |
88 | |
76e3520e |
89 | #ifndef PERL_OBJECT |
a0d0e21e |
90 | typedef I32 CHECKPOINT; |
91 | |
c277df42 |
92 | /* |
93 | * Forwards. |
94 | */ |
95 | |
96 | static I32 regmatch _((regnode *prog)); |
97 | static I32 regrepeat _((regnode *p, I32 max)); |
98 | static I32 regrepeat_hard _((regnode *p, I32 max, I32 *lp)); |
99 | static I32 regtry _((regexp *prog, char *startpos)); |
ae5c130c |
100 | |
c277df42 |
101 | static bool reginclass _((char *p, I32 c)); |
55497cff |
102 | static CHECKPOINT regcppush _((I32 parenfloor)); |
103 | static char * regcppop _((void)); |
76e3520e |
104 | #endif |
ae5c130c |
105 | #define REGINCLASS(p,c) (*(p) ? reginclass(p,c) : ANYOF_TEST(p,c)) |
a0d0e21e |
106 | |
76e3520e |
107 | STATIC CHECKPOINT |
8ac85365 |
108 | regcppush(I32 parenfloor) |
a0d0e21e |
109 | { |
11343788 |
110 | dTHR; |
3280af22 |
111 | int retval = PL_savestack_ix; |
112 | int i = (PL_regsize - parenfloor) * 4; |
a0d0e21e |
113 | int p; |
114 | |
115 | SSCHECK(i + 5); |
3280af22 |
116 | for (p = PL_regsize; p > parenfloor; p--) { |
117 | SSPUSHPTR(PL_regendp[p]); |
118 | SSPUSHPTR(PL_regstartp[p]); |
119 | SSPUSHPTR(PL_reg_start_tmp[p]); |
a0d0e21e |
120 | SSPUSHINT(p); |
121 | } |
3280af22 |
122 | SSPUSHINT(PL_regsize); |
123 | SSPUSHINT(*PL_reglastparen); |
124 | SSPUSHPTR(PL_reginput); |
a0d0e21e |
125 | SSPUSHINT(i + 3); |
126 | SSPUSHINT(SAVEt_REGCONTEXT); |
127 | return retval; |
128 | } |
129 | |
c277df42 |
130 | /* These are needed since we do not localize EVAL nodes: */ |
c3464db5 |
131 | # define REGCP_SET DEBUG_r(PerlIO_printf(Perl_debug_log, \ |
132 | " Setting an EVAL scope, savestack=%i\n", \ |
3280af22 |
133 | PL_savestack_ix)); lastcp = PL_savestack_ix |
c3464db5 |
134 | |
3280af22 |
135 | # define REGCP_UNWIND DEBUG_r(lastcp != PL_savestack_ix ? \ |
c3464db5 |
136 | PerlIO_printf(Perl_debug_log, \ |
137 | " Clearing an EVAL scope, savestack=%i..%i\n", \ |
3280af22 |
138 | lastcp, PL_savestack_ix) : 0); regcpblow(lastcp) |
c277df42 |
139 | |
76e3520e |
140 | STATIC char * |
8ac85365 |
141 | regcppop(void) |
a0d0e21e |
142 | { |
11343788 |
143 | dTHR; |
a0d0e21e |
144 | I32 i = SSPOPINT; |
145 | U32 paren = 0; |
146 | char *input; |
147 | char *tmps; |
148 | assert(i == SAVEt_REGCONTEXT); |
149 | i = SSPOPINT; |
150 | input = (char *) SSPOPPTR; |
3280af22 |
151 | *PL_reglastparen = SSPOPINT; |
152 | PL_regsize = SSPOPINT; |
c277df42 |
153 | for (i -= 3; i > 0; i -= 4) { |
a0d0e21e |
154 | paren = (U32)SSPOPINT; |
3280af22 |
155 | PL_reg_start_tmp[paren] = (char *) SSPOPPTR; |
156 | PL_regstartp[paren] = (char *) SSPOPPTR; |
a0d0e21e |
157 | tmps = (char*)SSPOPPTR; |
3280af22 |
158 | if (paren <= *PL_reglastparen) |
159 | PL_regendp[paren] = tmps; |
c277df42 |
160 | DEBUG_r( |
c3464db5 |
161 | PerlIO_printf(Perl_debug_log, |
162 | " restoring \\%d to %d(%d)..%d%s\n", |
3280af22 |
163 | paren, PL_regstartp[paren] - PL_regbol, |
164 | PL_reg_start_tmp[paren] - PL_regbol, |
165 | PL_regendp[paren] - PL_regbol, |
166 | (paren > *PL_reglastparen ? "(no)" : "")); |
c277df42 |
167 | ); |
a0d0e21e |
168 | } |
c277df42 |
169 | DEBUG_r( |
3280af22 |
170 | if (*PL_reglastparen + 1 <= PL_regnpar) { |
c3464db5 |
171 | PerlIO_printf(Perl_debug_log, |
172 | " restoring \\%d..\\%d to undef\n", |
3280af22 |
173 | *PL_reglastparen + 1, PL_regnpar); |
c277df42 |
174 | } |
175 | ); |
3280af22 |
176 | for (paren = *PL_reglastparen + 1; paren <= PL_regnpar; paren++) { |
177 | if (paren > PL_regsize) |
178 | PL_regstartp[paren] = Nullch; |
179 | PL_regendp[paren] = Nullch; |
a0d0e21e |
180 | } |
181 | return input; |
182 | } |
183 | |
c277df42 |
184 | #define regcpblow(cp) LEAVE_SCOPE(cp) |
a0d0e21e |
185 | |
a687059c |
186 | /* |
e50aee73 |
187 | * pregexec and friends |
a687059c |
188 | */ |
189 | |
190 | /* |
c277df42 |
191 | - pregexec - match a regexp against a string |
a687059c |
192 | */ |
c277df42 |
193 | I32 |
c3464db5 |
194 | pregexec(register regexp *prog, char *stringarg, register char *strend, |
195 | char *strbeg, I32 minend, SV *screamer, U32 nosave) |
c277df42 |
196 | /* strend: pointer to null at end of string */ |
197 | /* strbeg: real beginning of string */ |
198 | /* minend: end of match must be >=minend after stringarg. */ |
199 | /* nosave: For optimizations. */ |
200 | { |
201 | return |
202 | regexec_flags(prog, stringarg, strend, strbeg, minend, screamer, NULL, |
203 | nosave ? 0 : REXEC_COPY_STR); |
204 | } |
205 | |
a687059c |
206 | /* |
c277df42 |
207 | - regexec_flags - match a regexp against a string |
a687059c |
208 | */ |
79072805 |
209 | I32 |
c3464db5 |
210 | regexec_flags(register regexp *prog, char *stringarg, register char *strend, |
211 | char *strbeg, I32 minend, SV *screamer, void *data, U32 flags) |
c277df42 |
212 | /* strend: pointer to null at end of string */ |
213 | /* strbeg: real beginning of string */ |
214 | /* minend: end of match must be >=minend after stringarg. */ |
215 | /* data: May be used for some additional optimizations. */ |
216 | /* nosave: For optimizations. */ |
a687059c |
217 | { |
5c0ca799 |
218 | dTHR; |
a0d0e21e |
219 | register char *s; |
c277df42 |
220 | register regnode *c; |
a0d0e21e |
221 | register char *startpos = stringarg; |
222 | register I32 tmp; |
c277df42 |
223 | I32 minlen; /* must match at least this many chars */ |
a0d0e21e |
224 | I32 dontbother = 0; /* how many characters not to try at end */ |
225 | CURCUR cc; |
c277df42 |
226 | I32 start_shift = 0; /* Offset of the start to find |
227 | constant substr. */ |
228 | I32 end_shift = 0; /* Same for the end. */ |
229 | I32 scream_pos = -1; /* Internal iterator of scream. */ |
230 | char *scream_olds; |
3280af22 |
231 | SV* oreplsv = GvSV(PL_replgv); |
a687059c |
232 | |
a0d0e21e |
233 | cc.cur = 0; |
4633a7c4 |
234 | cc.oldcc = 0; |
3280af22 |
235 | PL_regcc = &cc; |
a0d0e21e |
236 | |
3280af22 |
237 | PL_regprecomp = prog->precomp; /* Needed for error messages. */ |
a0d0e21e |
238 | #ifdef DEBUGGING |
3280af22 |
239 | PL_regnarrate = PL_debug & 512; |
240 | PL_regprogram = prog->program; |
a0d0e21e |
241 | #endif |
242 | |
243 | /* Be paranoid... */ |
244 | if (prog == NULL || startpos == NULL) { |
245 | croak("NULL regexp parameter"); |
246 | return 0; |
247 | } |
248 | |
c277df42 |
249 | minlen = prog->minlen; |
250 | if (strend - startpos < minlen) goto phooey; |
251 | |
a0d0e21e |
252 | if (startpos == strbeg) /* is ^ valid at stringarg? */ |
3280af22 |
253 | PL_regprev = '\n'; |
a0d0e21e |
254 | else { |
3280af22 |
255 | PL_regprev = stringarg[-1]; |
256 | if (!PL_multiline && PL_regprev == '\n') |
257 | PL_regprev = '\0'; /* force ^ to NOT match */ |
a0d0e21e |
258 | } |
bbce6d69 |
259 | |
a0d0e21e |
260 | /* Check validity of program. */ |
261 | if (UCHARAT(prog->program) != MAGIC) { |
262 | FAIL("corrupted regexp program"); |
263 | } |
264 | |
3280af22 |
265 | PL_regnpar = prog->nparens; |
266 | PL_reg_flags = 0; |
267 | PL_reg_eval_set = 0; |
a0d0e21e |
268 | |
269 | /* If there is a "must appear" string, look for it. */ |
270 | s = startpos; |
c277df42 |
271 | if (!(flags & REXEC_CHECKED) |
272 | && prog->check_substr != Nullsv && |
774d564b |
273 | !(prog->reganch & ROPT_ANCH_GPOS) && |
c277df42 |
274 | (!(prog->reganch & (ROPT_ANCH_BOL | ROPT_ANCH_MBOL)) |
3280af22 |
275 | || (PL_multiline && prog->check_substr == prog->anchored_substr)) ) |
a0d0e21e |
276 | { |
c277df42 |
277 | start_shift = prog->check_offset_min; |
278 | /* Should be nonnegative! */ |
279 | end_shift = minlen - start_shift - SvCUR(prog->check_substr); |
280 | if (screamer) { |
3280af22 |
281 | if (PL_screamfirst[BmRARE(prog->check_substr)] >= 0) |
c277df42 |
282 | s = screaminstr(screamer, prog->check_substr, |
283 | start_shift + (stringarg - strbeg), |
284 | end_shift, &scream_pos, 0); |
a0d0e21e |
285 | else |
286 | s = Nullch; |
c277df42 |
287 | scream_olds = s; |
0a12ae7d |
288 | } |
a0d0e21e |
289 | else |
c277df42 |
290 | s = fbm_instr((unsigned char*)s + start_shift, |
291 | (unsigned char*)strend - end_shift, |
411d5715 |
292 | prog->check_substr, 0); |
a0d0e21e |
293 | if (!s) { |
c277df42 |
294 | ++BmUSEFUL(prog->check_substr); /* hooray */ |
a0d0e21e |
295 | goto phooey; /* not present */ |
c277df42 |
296 | } else if ((s - stringarg) > prog->check_offset_max) { |
297 | ++BmUSEFUL(prog->check_substr); /* hooray/2 */ |
298 | s -= prog->check_offset_max; |
299 | } else if (!prog->naughty |
300 | && --BmUSEFUL(prog->check_substr) < 0 |
301 | && prog->check_substr == prog->float_substr) { /* boo */ |
302 | SvREFCNT_dec(prog->check_substr); |
303 | prog->check_substr = Nullsv; /* disable */ |
304 | prog->float_substr = Nullsv; /* clear */ |
a0d0e21e |
305 | s = startpos; |
c277df42 |
306 | } else s = startpos; |
a0d0e21e |
307 | } |
a687059c |
308 | |
c277df42 |
309 | /* Mark beginning of line for ^ and lookbehind. */ |
3280af22 |
310 | PL_regbol = startpos; |
311 | PL_bostr = strbeg; |
a687059c |
312 | |
a0d0e21e |
313 | /* Mark end of line for $ (and such) */ |
3280af22 |
314 | PL_regeol = strend; |
a687059c |
315 | |
a0d0e21e |
316 | /* see how far we have to get to not match where we matched before */ |
3280af22 |
317 | PL_regtill = startpos+minend; |
a687059c |
318 | |
c277df42 |
319 | DEBUG_r( |
320 | PerlIO_printf(Perl_debug_log, |
321 | "Matching `%.60s%s' against `%.*s%s'\n", |
322 | prog->precomp, |
323 | (strlen(prog->precomp) > 60 ? "..." : ""), |
324 | (strend - startpos > 60 ? 60 : strend - startpos), |
325 | startpos, |
326 | (strend - startpos > 60 ? "..." : "")) |
327 | ); |
328 | |
a0d0e21e |
329 | /* Simplest case: anchored match need be tried only once. */ |
774d564b |
330 | /* [unless only anchor is BOL and multiline is set] */ |
a0d0e21e |
331 | if (prog->reganch & ROPT_ANCH) { |
332 | if (regtry(prog, startpos)) |
333 | goto got_it; |
774d564b |
334 | else if (!(prog->reganch & ROPT_ANCH_GPOS) && |
3280af22 |
335 | (PL_multiline || (prog->reganch & ROPT_IMPLICIT) |
c277df42 |
336 | || (prog->reganch & ROPT_ANCH_MBOL))) |
774d564b |
337 | { |
a0d0e21e |
338 | if (minlen) |
339 | dontbother = minlen - 1; |
340 | strend -= dontbother; |
341 | /* for multiline we only have to try after newlines */ |
342 | if (s > startpos) |
343 | s--; |
344 | while (s < strend) { |
345 | if (*s++ == '\n') { |
346 | if (s < strend && regtry(prog, s)) |
347 | goto got_it; |
348 | } |
35c8bce7 |
349 | } |
35c8bce7 |
350 | } |
a0d0e21e |
351 | goto phooey; |
352 | } |
35c8bce7 |
353 | |
a0d0e21e |
354 | /* Messy cases: unanchored match. */ |
c277df42 |
355 | if (prog->anchored_substr && prog->reganch & ROPT_SKIP) { |
356 | /* we have /x+whatever/ */ |
357 | /* it must be a one character string */ |
358 | char ch = SvPVX(prog->anchored_substr)[0]; |
359 | while (s < strend) { |
360 | if (*s == ch) { |
361 | if (regtry(prog, s)) goto got_it; |
a0d0e21e |
362 | s++; |
c277df42 |
363 | while (s < strend && *s == ch) |
364 | s++; |
a0d0e21e |
365 | } |
c277df42 |
366 | s++; |
a687059c |
367 | } |
c277df42 |
368 | } |
369 | /*SUPPRESS 560*/ |
370 | else if (prog->anchored_substr != Nullsv |
371 | || (prog->float_substr != Nullsv |
372 | && prog->float_max_offset < strend - s)) { |
373 | SV *must = prog->anchored_substr |
374 | ? prog->anchored_substr : prog->float_substr; |
375 | I32 back_max = |
376 | prog->anchored_substr ? prog->anchored_offset : prog->float_max_offset; |
377 | I32 back_min = |
378 | prog->anchored_substr ? prog->anchored_offset : prog->float_min_offset; |
379 | I32 delta = back_max - back_min; |
380 | char *last = strend - SvCUR(must) - back_min; /* Cannot start after this */ |
381 | char *last1 = s - 1; /* Last position checked before */ |
382 | |
383 | /* XXXX check_substr already used to find `s', can optimize if |
384 | check_substr==must. */ |
385 | scream_pos = -1; |
386 | dontbother = end_shift; |
387 | strend -= dontbother; |
388 | while ( (s <= last) && |
389 | (screamer |
390 | ? (s = screaminstr(screamer, must, s + back_min - strbeg, |
391 | end_shift, &scream_pos, 0)) |
392 | : (s = fbm_instr((unsigned char*)s + back_min, |
411d5715 |
393 | (unsigned char*)strend, must, 0))) ) { |
c277df42 |
394 | if (s - back_max > last1) { |
395 | last1 = s - back_min; |
396 | s = s - back_max; |
397 | } else { |
398 | char *t = last1 + 1; |
399 | |
400 | last1 = s - back_min; |
401 | s = t; |
a0d0e21e |
402 | } |
c277df42 |
403 | while (s <= last1) { |
a0d0e21e |
404 | if (regtry(prog, s)) |
405 | goto got_it; |
406 | s++; |
407 | } |
408 | } |
409 | goto phooey; |
c277df42 |
410 | } else if (c = prog->regstclass) { |
a0d0e21e |
411 | I32 doevery = (prog->reganch & ROPT_SKIP) == 0; |
161b471a |
412 | char *Class; |
a687059c |
413 | |
a0d0e21e |
414 | if (minlen) |
415 | dontbother = minlen - 1; |
416 | strend -= dontbother; /* don't bother with what can't match */ |
417 | tmp = 1; |
418 | /* We know what class it must start with. */ |
419 | switch (OP(c)) { |
420 | case ANYOF: |
161b471a |
421 | Class = (char *) OPERAND(c); |
a0d0e21e |
422 | while (s < strend) { |
ae5c130c |
423 | if (REGINCLASS(Class, *s)) { |
a0d0e21e |
424 | if (tmp && regtry(prog, s)) |
425 | goto got_it; |
426 | else |
427 | tmp = doevery; |
a687059c |
428 | } |
a0d0e21e |
429 | else |
430 | tmp = 1; |
431 | s++; |
432 | } |
433 | break; |
bbce6d69 |
434 | case BOUNDL: |
3280af22 |
435 | PL_reg_flags |= RF_tainted; |
bbce6d69 |
436 | /* FALL THROUGH */ |
a0d0e21e |
437 | case BOUND: |
438 | if (minlen) |
439 | dontbother++,strend--; |
3280af22 |
440 | tmp = (s != startpos) ? UCHARAT(s - 1) : PL_regprev; |
95bac841 |
441 | tmp = ((OP(c) == BOUND ? isALNUM(tmp) : isALNUM_LC(tmp)) != 0); |
a0d0e21e |
442 | while (s < strend) { |
95bac841 |
443 | if (tmp == !(OP(c) == BOUND ? isALNUM(*s) : isALNUM_LC(*s))) { |
a0d0e21e |
444 | tmp = !tmp; |
445 | if (regtry(prog, s)) |
446 | goto got_it; |
a687059c |
447 | } |
a0d0e21e |
448 | s++; |
449 | } |
450 | if ((minlen || tmp) && regtry(prog,s)) |
451 | goto got_it; |
452 | break; |
bbce6d69 |
453 | case NBOUNDL: |
3280af22 |
454 | PL_reg_flags |= RF_tainted; |
bbce6d69 |
455 | /* FALL THROUGH */ |
a0d0e21e |
456 | case NBOUND: |
457 | if (minlen) |
458 | dontbother++,strend--; |
3280af22 |
459 | tmp = (s != startpos) ? UCHARAT(s - 1) : PL_regprev; |
95bac841 |
460 | tmp = ((OP(c) == NBOUND ? isALNUM(tmp) : isALNUM_LC(tmp)) != 0); |
a0d0e21e |
461 | while (s < strend) { |
95bac841 |
462 | if (tmp == !(OP(c) == NBOUND ? isALNUM(*s) : isALNUM_LC(*s))) |
a0d0e21e |
463 | tmp = !tmp; |
464 | else if (regtry(prog, s)) |
465 | goto got_it; |
466 | s++; |
467 | } |
468 | if ((minlen || !tmp) && regtry(prog,s)) |
469 | goto got_it; |
470 | break; |
471 | case ALNUM: |
472 | while (s < strend) { |
bbce6d69 |
473 | if (isALNUM(*s)) { |
474 | if (tmp && regtry(prog, s)) |
475 | goto got_it; |
476 | else |
477 | tmp = doevery; |
478 | } |
479 | else |
480 | tmp = 1; |
481 | s++; |
482 | } |
483 | break; |
484 | case ALNUML: |
3280af22 |
485 | PL_reg_flags |= RF_tainted; |
bbce6d69 |
486 | while (s < strend) { |
487 | if (isALNUM_LC(*s)) { |
a0d0e21e |
488 | if (tmp && regtry(prog, s)) |
489 | goto got_it; |
a687059c |
490 | else |
a0d0e21e |
491 | tmp = doevery; |
492 | } |
493 | else |
494 | tmp = 1; |
495 | s++; |
496 | } |
497 | break; |
498 | case NALNUM: |
499 | while (s < strend) { |
bbce6d69 |
500 | if (!isALNUM(*s)) { |
501 | if (tmp && regtry(prog, s)) |
502 | goto got_it; |
503 | else |
504 | tmp = doevery; |
505 | } |
506 | else |
507 | tmp = 1; |
508 | s++; |
509 | } |
510 | break; |
511 | case NALNUML: |
3280af22 |
512 | PL_reg_flags |= RF_tainted; |
bbce6d69 |
513 | while (s < strend) { |
514 | if (!isALNUM_LC(*s)) { |
a0d0e21e |
515 | if (tmp && regtry(prog, s)) |
516 | goto got_it; |
a687059c |
517 | else |
a0d0e21e |
518 | tmp = doevery; |
a687059c |
519 | } |
a0d0e21e |
520 | else |
521 | tmp = 1; |
522 | s++; |
523 | } |
524 | break; |
525 | case SPACE: |
526 | while (s < strend) { |
527 | if (isSPACE(*s)) { |
528 | if (tmp && regtry(prog, s)) |
529 | goto got_it; |
530 | else |
531 | tmp = doevery; |
2304df62 |
532 | } |
a0d0e21e |
533 | else |
534 | tmp = 1; |
535 | s++; |
536 | } |
537 | break; |
bbce6d69 |
538 | case SPACEL: |
3280af22 |
539 | PL_reg_flags |= RF_tainted; |
bbce6d69 |
540 | while (s < strend) { |
541 | if (isSPACE_LC(*s)) { |
542 | if (tmp && regtry(prog, s)) |
543 | goto got_it; |
544 | else |
545 | tmp = doevery; |
546 | } |
547 | else |
548 | tmp = 1; |
549 | s++; |
550 | } |
551 | break; |
a0d0e21e |
552 | case NSPACE: |
553 | while (s < strend) { |
554 | if (!isSPACE(*s)) { |
555 | if (tmp && regtry(prog, s)) |
556 | goto got_it; |
557 | else |
558 | tmp = doevery; |
a687059c |
559 | } |
a0d0e21e |
560 | else |
561 | tmp = 1; |
562 | s++; |
563 | } |
564 | break; |
bbce6d69 |
565 | case NSPACEL: |
3280af22 |
566 | PL_reg_flags |= RF_tainted; |
bbce6d69 |
567 | while (s < strend) { |
568 | if (!isSPACE_LC(*s)) { |
569 | if (tmp && regtry(prog, s)) |
570 | goto got_it; |
571 | else |
572 | tmp = doevery; |
573 | } |
574 | else |
575 | tmp = 1; |
576 | s++; |
577 | } |
578 | break; |
a0d0e21e |
579 | case DIGIT: |
580 | while (s < strend) { |
581 | if (isDIGIT(*s)) { |
582 | if (tmp && regtry(prog, s)) |
583 | goto got_it; |
584 | else |
585 | tmp = doevery; |
2b69d0c2 |
586 | } |
a0d0e21e |
587 | else |
588 | tmp = 1; |
589 | s++; |
590 | } |
591 | break; |
592 | case NDIGIT: |
593 | while (s < strend) { |
594 | if (!isDIGIT(*s)) { |
595 | if (tmp && regtry(prog, s)) |
596 | goto got_it; |
597 | else |
598 | tmp = doevery; |
a687059c |
599 | } |
a0d0e21e |
600 | else |
601 | tmp = 1; |
602 | s++; |
603 | } |
604 | break; |
a687059c |
605 | } |
a0d0e21e |
606 | } |
607 | else { |
c277df42 |
608 | dontbother = 0; |
609 | if (prog->float_substr != Nullsv) { /* Trim the end. */ |
610 | char *last; |
611 | I32 oldpos = scream_pos; |
612 | |
613 | if (screamer) { |
614 | last = screaminstr(screamer, prog->float_substr, s - strbeg, |
615 | end_shift, &scream_pos, 1); /* last one */ |
616 | if (!last) { |
617 | last = scream_olds; /* Only one occurence. */ |
618 | } |
619 | } else { |
620 | STRLEN len; |
621 | char *little = SvPV(prog->float_substr, len); |
19b4f81a |
622 | if (len) |
623 | last = rninstr(s, strend, little, little + len); |
624 | else |
625 | last = strend; /* matching `$' */ |
c277df42 |
626 | } |
627 | if (last == NULL) goto phooey; /* Should not happen! */ |
19b4f81a |
628 | dontbother = strend - last + prog->float_min_offset; |
c277df42 |
629 | } |
630 | if (minlen && (dontbother < minlen)) |
a0d0e21e |
631 | dontbother = minlen - 1; |
632 | strend -= dontbother; |
633 | /* We don't know much -- general case. */ |
634 | do { |
635 | if (regtry(prog, s)) |
636 | goto got_it; |
637 | } while (s++ < strend); |
638 | } |
639 | |
640 | /* Failure. */ |
641 | goto phooey; |
a687059c |
642 | |
a0d0e21e |
643 | got_it: |
644 | prog->subbeg = strbeg; |
19b4f81a |
645 | prog->subend = PL_regeol; /* strend may have been modified */ |
3280af22 |
646 | RX_MATCH_TAINTED_set(prog, PL_reg_flags & RF_tainted); |
5f05dabc |
647 | |
648 | /* make sure $`, $&, $', and $digit will work later */ |
c277df42 |
649 | if (strbeg != prog->subbase) { /* second+ //g match. */ |
650 | if (!(flags & REXEC_COPY_STR)) { |
137443ea |
651 | if (prog->subbase) { |
652 | Safefree(prog->subbase); |
653 | prog->subbase = Nullch; |
654 | } |
655 | } |
656 | else { |
19b4f81a |
657 | I32 i = PL_regeol - startpos + (stringarg - strbeg); |
137443ea |
658 | s = savepvn(strbeg, i); |
659 | Safefree(prog->subbase); |
660 | prog->subbase = s; |
661 | prog->subbeg = prog->subbase; |
662 | prog->subend = prog->subbase + i; |
663 | s = prog->subbase + (stringarg - strbeg); |
664 | for (i = 0; i <= prog->nparens; i++) { |
665 | if (prog->endp[i]) { |
666 | prog->startp[i] = s + (prog->startp[i] - startpos); |
667 | prog->endp[i] = s + (prog->endp[i] - startpos); |
668 | } |
a0d0e21e |
669 | } |
670 | } |
a0d0e21e |
671 | } |
ce862d02 |
672 | /* Preserve the current value of $^R */ |
3280af22 |
673 | if (oreplsv != GvSV(PL_replgv)) { |
674 | sv_setsv(oreplsv, GvSV(PL_replgv));/* So that when GvSV(replgv) is |
ce862d02 |
675 | restored, the value remains |
676 | the same. */ |
677 | } |
a0d0e21e |
678 | return 1; |
679 | |
680 | phooey: |
a0d0e21e |
681 | return 0; |
a687059c |
682 | } |
683 | |
684 | /* |
685 | - regtry - try match at specific point |
686 | */ |
76e3520e |
687 | STATIC I32 /* 0 failure, 1 success */ |
8ac85365 |
688 | regtry(regexp *prog, char *startpos) |
a687059c |
689 | { |
c277df42 |
690 | dTHR; |
a0d0e21e |
691 | register I32 i; |
692 | register char **sp; |
693 | register char **ep; |
c277df42 |
694 | CHECKPOINT lastcp; |
a0d0e21e |
695 | |
3280af22 |
696 | if ((prog->reganch & ROPT_EVAL_SEEN) && !PL_reg_eval_set) { |
697 | PL_reg_eval_set = RS_init; |
ce862d02 |
698 | DEBUG_r(DEBUG_s( |
c3464db5 |
699 | PerlIO_printf(Perl_debug_log, " setting stack tmpbase at %i\n", |
3280af22 |
700 | PL_stack_sp - PL_stack_base); |
ce862d02 |
701 | )); |
702 | SAVEINT(cxstack[cxstack_ix].blk_oldsp); |
3280af22 |
703 | cxstack[cxstack_ix].blk_oldsp = PL_stack_sp - PL_stack_base; |
ce862d02 |
704 | /* Otherwise OP_NEXTSTATE will free whatever on stack now. */ |
705 | SAVETMPS; |
706 | /* Apparently this is not needed, judging by wantarray. */ |
707 | /* SAVEINT(cxstack[cxstack_ix].blk_gimme); |
708 | cxstack[cxstack_ix].blk_gimme = G_SCALAR; */ |
709 | } |
3280af22 |
710 | PL_reginput = startpos; |
711 | PL_regstartp = prog->startp; |
712 | PL_regendp = prog->endp; |
713 | PL_reglastparen = &prog->lastparen; |
a0d0e21e |
714 | prog->lastparen = 0; |
3280af22 |
715 | PL_regsize = 0; |
716 | if (PL_reg_start_tmpl <= prog->nparens) { |
717 | PL_reg_start_tmpl = prog->nparens*3/2 + 3; |
718 | if(PL_reg_start_tmp) |
719 | Renew(PL_reg_start_tmp, PL_reg_start_tmpl, char*); |
c277df42 |
720 | else |
3280af22 |
721 | New(22,PL_reg_start_tmp, PL_reg_start_tmpl, char*); |
c277df42 |
722 | } |
a0d0e21e |
723 | |
724 | sp = prog->startp; |
725 | ep = prog->endp; |
3280af22 |
726 | PL_regdata = prog->data; |
a0d0e21e |
727 | if (prog->nparens) { |
728 | for (i = prog->nparens; i >= 0; i--) { |
729 | *sp++ = NULL; |
730 | *ep++ = NULL; |
a687059c |
731 | } |
a0d0e21e |
732 | } |
c277df42 |
733 | REGCP_SET; |
7e5428c5 |
734 | if (regmatch(prog->program + 1)) { |
a0d0e21e |
735 | prog->startp[0] = startpos; |
3280af22 |
736 | prog->endp[0] = PL_reginput; |
a0d0e21e |
737 | return 1; |
738 | } |
c277df42 |
739 | REGCP_UNWIND; |
740 | return 0; |
a687059c |
741 | } |
742 | |
743 | /* |
744 | - regmatch - main matching routine |
745 | * |
746 | * Conceptually the strategy is simple: check to see whether the current |
747 | * node matches, call self recursively to see whether the rest matches, |
748 | * and then act accordingly. In practice we make some effort to avoid |
749 | * recursion, in particular by going through "ordinary" nodes (that don't |
750 | * need to know whether the rest of the match failed) by a loop instead of |
751 | * by recursion. |
752 | */ |
753 | /* [lwall] I've hoisted the register declarations to the outer block in order to |
754 | * maybe save a little bit of pushing and popping on the stack. It also takes |
755 | * advantage of machines that use a register save mask on subroutine entry. |
756 | */ |
76e3520e |
757 | STATIC I32 /* 0 failure, 1 success */ |
c277df42 |
758 | regmatch(regnode *prog) |
a687059c |
759 | { |
c277df42 |
760 | dTHR; |
761 | register regnode *scan; /* Current node. */ |
762 | regnode *next; /* Next node. */ |
763 | regnode *inner; /* Next node in internal branch. */ |
c3464db5 |
764 | register I32 nextchr; /* renamed nextchr - nextchar colides with |
765 | function of same name */ |
a0d0e21e |
766 | register I32 n; /* no or next */ |
767 | register I32 ln; /* len or last */ |
768 | register char *s; /* operand or save */ |
3280af22 |
769 | register char *locinput = PL_reginput; |
c277df42 |
770 | register I32 c1, c2, paren; /* case fold search, parenth */ |
771 | int minmod = 0, sw = 0, logical = 0; |
4633a7c4 |
772 | #ifdef DEBUGGING |
3280af22 |
773 | PL_regindent++; |
4633a7c4 |
774 | #endif |
a0d0e21e |
775 | |
76e3520e |
776 | nextchr = UCHARAT(locinput); |
a0d0e21e |
777 | scan = prog; |
778 | while (scan != NULL) { |
c277df42 |
779 | #define sayNO_L (logical ? (logical = 0, sw = 0, goto cont) : sayNO) |
a687059c |
780 | #ifdef DEBUGGING |
c277df42 |
781 | # define sayYES goto yes |
782 | # define sayNO goto no |
783 | # define saySAME(x) if (x) goto yes; else goto no |
784 | # define REPORT_CODE_OFF 24 |
4633a7c4 |
785 | #else |
c277df42 |
786 | # define sayYES return 1 |
787 | # define sayNO return 0 |
788 | # define saySAME(x) return x |
a687059c |
789 | #endif |
c277df42 |
790 | DEBUG_r( { |
791 | SV *prop = sv_newmortal(); |
3280af22 |
792 | int docolor = *PL_colors[0]; |
c277df42 |
793 | int taill = (docolor ? 10 : 7); /* 3 chars for "> <" */ |
3280af22 |
794 | int l = (PL_regeol - locinput > taill ? taill : PL_regeol - locinput); |
795 | int pref_len = (locinput - PL_bostr > (5 + taill) - l |
796 | ? (5 + taill) - l : locinput - PL_bostr); |
c277df42 |
797 | |
3280af22 |
798 | if (l + pref_len < (5 + taill) && l < PL_regeol - locinput) |
799 | l = ( PL_regeol - locinput > (5 + taill) - pref_len |
800 | ? (5 + taill) - pref_len : PL_regeol - locinput); |
c277df42 |
801 | regprop(prop, scan); |
802 | PerlIO_printf(Perl_debug_log, |
54dc92de |
803 | "%4i <%s%.*s%s%s%s%.*s%s>%*s|%3d:%*s%s\n", |
3280af22 |
804 | locinput - PL_bostr, |
805 | PL_colors[2], pref_len, locinput - pref_len, PL_colors[3], |
c277df42 |
806 | (docolor ? "" : "> <"), |
3280af22 |
807 | PL_colors[0], l, locinput, PL_colors[1], |
c277df42 |
808 | 15 - l - pref_len + 1, |
809 | "", |
3280af22 |
810 | scan - PL_regprogram, PL_regindent*2, "", |
c277df42 |
811 | SvPVX(prop)); |
812 | } ); |
a687059c |
813 | |
c277df42 |
814 | next = scan + NEXT_OFF(scan); |
a0d0e21e |
815 | if (next == scan) |
816 | next = NULL; |
a687059c |
817 | |
a0d0e21e |
818 | switch (OP(scan)) { |
819 | case BOL: |
3280af22 |
820 | if (locinput == PL_bostr |
821 | ? PL_regprev == '\n' |
822 | : (PL_multiline && |
823 | (nextchr || locinput < PL_regeol) && locinput[-1] == '\n') ) |
a0d0e21e |
824 | { |
6b88bc9c |
825 | /* PL_regtill = PL_regbol; */ |
a0d0e21e |
826 | break; |
827 | } |
4633a7c4 |
828 | sayNO; |
a0d0e21e |
829 | case MBOL: |
3280af22 |
830 | if (locinput == PL_bostr |
831 | ? PL_regprev == '\n' |
832 | : ((nextchr || locinput < PL_regeol) && locinput[-1] == '\n') ) |
a0d0e21e |
833 | { |
834 | break; |
835 | } |
4633a7c4 |
836 | sayNO; |
a0d0e21e |
837 | case SBOL: |
3280af22 |
838 | if (locinput == PL_regbol && PL_regprev == '\n') |
a0d0e21e |
839 | break; |
4633a7c4 |
840 | sayNO; |
774d564b |
841 | case GPOS: |
3280af22 |
842 | if (locinput == PL_regbol) |
a0d0e21e |
843 | break; |
4633a7c4 |
844 | sayNO; |
a0d0e21e |
845 | case EOL: |
3280af22 |
846 | if (PL_multiline) |
a0d0e21e |
847 | goto meol; |
848 | else |
849 | goto seol; |
850 | case MEOL: |
851 | meol: |
3280af22 |
852 | if ((nextchr || locinput < PL_regeol) && nextchr != '\n') |
4633a7c4 |
853 | sayNO; |
a0d0e21e |
854 | break; |
855 | case SEOL: |
856 | seol: |
3280af22 |
857 | if ((nextchr || locinput < PL_regeol) && nextchr != '\n') |
4633a7c4 |
858 | sayNO; |
3280af22 |
859 | if (PL_regeol - locinput > 1) |
4633a7c4 |
860 | sayNO; |
a0d0e21e |
861 | break; |
b85d18e9 |
862 | case EOS: |
3280af22 |
863 | if (PL_regeol != locinput) |
b85d18e9 |
864 | sayNO; |
865 | break; |
a0d0e21e |
866 | case SANY: |
3280af22 |
867 | if (!nextchr && locinput >= PL_regeol) |
4633a7c4 |
868 | sayNO; |
76e3520e |
869 | nextchr = UCHARAT(++locinput); |
a0d0e21e |
870 | break; |
871 | case ANY: |
3280af22 |
872 | if (!nextchr && locinput >= PL_regeol || nextchr == '\n') |
4633a7c4 |
873 | sayNO; |
76e3520e |
874 | nextchr = UCHARAT(++locinput); |
a0d0e21e |
875 | break; |
bbce6d69 |
876 | case EXACT: |
161b471a |
877 | s = (char *) OPERAND(scan); |
c277df42 |
878 | ln = UCHARAT(s++); |
a0d0e21e |
879 | /* Inline the first character, for speed. */ |
76e3520e |
880 | if (UCHARAT(s) != nextchr) |
4633a7c4 |
881 | sayNO; |
3280af22 |
882 | if (PL_regeol - locinput < ln) |
4633a7c4 |
883 | sayNO; |
36477c24 |
884 | if (ln > 1 && memNE(s, locinput, ln)) |
4633a7c4 |
885 | sayNO; |
a0d0e21e |
886 | locinput += ln; |
76e3520e |
887 | nextchr = UCHARAT(locinput); |
bbce6d69 |
888 | break; |
889 | case EXACTFL: |
3280af22 |
890 | PL_reg_flags |= RF_tainted; |
bbce6d69 |
891 | /* FALL THROUGH */ |
892 | case EXACTF: |
161b471a |
893 | s = (char *) OPERAND(scan); |
c277df42 |
894 | ln = UCHARAT(s++); |
bbce6d69 |
895 | /* Inline the first character, for speed. */ |
76e3520e |
896 | if (UCHARAT(s) != nextchr && |
bbce6d69 |
897 | UCHARAT(s) != ((OP(scan) == EXACTF) |
76e3520e |
898 | ? fold : fold_locale)[nextchr]) |
bbce6d69 |
899 | sayNO; |
3280af22 |
900 | if (PL_regeol - locinput < ln) |
bbce6d69 |
901 | sayNO; |
5f05dabc |
902 | if (ln > 1 && (OP(scan) == EXACTF |
903 | ? ibcmp(s, locinput, ln) |
904 | : ibcmp_locale(s, locinput, ln))) |
bbce6d69 |
905 | sayNO; |
906 | locinput += ln; |
76e3520e |
907 | nextchr = UCHARAT(locinput); |
a0d0e21e |
908 | break; |
909 | case ANYOF: |
161b471a |
910 | s = (char *) OPERAND(scan); |
76e3520e |
911 | if (nextchr < 0) |
912 | nextchr = UCHARAT(locinput); |
873ef191 |
913 | if (!REGINCLASS(s, nextchr)) |
4633a7c4 |
914 | sayNO; |
3280af22 |
915 | if (!nextchr && locinput >= PL_regeol) |
4633a7c4 |
916 | sayNO; |
76e3520e |
917 | nextchr = UCHARAT(++locinput); |
a0d0e21e |
918 | break; |
bbce6d69 |
919 | case ALNUML: |
3280af22 |
920 | PL_reg_flags |= RF_tainted; |
bbce6d69 |
921 | /* FALL THROUGH */ |
a0d0e21e |
922 | case ALNUM: |
76e3520e |
923 | if (!nextchr) |
4633a7c4 |
924 | sayNO; |
bbce6d69 |
925 | if (!(OP(scan) == ALNUM |
76e3520e |
926 | ? isALNUM(nextchr) : isALNUM_LC(nextchr))) |
4633a7c4 |
927 | sayNO; |
76e3520e |
928 | nextchr = UCHARAT(++locinput); |
a0d0e21e |
929 | break; |
bbce6d69 |
930 | case NALNUML: |
3280af22 |
931 | PL_reg_flags |= RF_tainted; |
bbce6d69 |
932 | /* FALL THROUGH */ |
a0d0e21e |
933 | case NALNUM: |
3280af22 |
934 | if (!nextchr && locinput >= PL_regeol) |
4633a7c4 |
935 | sayNO; |
bbce6d69 |
936 | if (OP(scan) == NALNUM |
76e3520e |
937 | ? isALNUM(nextchr) : isALNUM_LC(nextchr)) |
4633a7c4 |
938 | sayNO; |
76e3520e |
939 | nextchr = UCHARAT(++locinput); |
a0d0e21e |
940 | break; |
bbce6d69 |
941 | case BOUNDL: |
942 | case NBOUNDL: |
3280af22 |
943 | PL_reg_flags |= RF_tainted; |
bbce6d69 |
944 | /* FALL THROUGH */ |
a0d0e21e |
945 | case BOUND: |
bbce6d69 |
946 | case NBOUND: |
947 | /* was last char in word? */ |
3280af22 |
948 | ln = (locinput != PL_regbol) ? UCHARAT(locinput - 1) : PL_regprev; |
bbce6d69 |
949 | if (OP(scan) == BOUND || OP(scan) == NBOUND) { |
950 | ln = isALNUM(ln); |
76e3520e |
951 | n = isALNUM(nextchr); |
bbce6d69 |
952 | } |
953 | else { |
954 | ln = isALNUM_LC(ln); |
76e3520e |
955 | n = isALNUM_LC(nextchr); |
bbce6d69 |
956 | } |
95bac841 |
957 | if (((!ln) == (!n)) == (OP(scan) == BOUND || OP(scan) == BOUNDL)) |
4633a7c4 |
958 | sayNO; |
a0d0e21e |
959 | break; |
bbce6d69 |
960 | case SPACEL: |
3280af22 |
961 | PL_reg_flags |= RF_tainted; |
bbce6d69 |
962 | /* FALL THROUGH */ |
a0d0e21e |
963 | case SPACE: |
3280af22 |
964 | if (!nextchr && locinput >= PL_regeol) |
4633a7c4 |
965 | sayNO; |
bbce6d69 |
966 | if (!(OP(scan) == SPACE |
76e3520e |
967 | ? isSPACE(nextchr) : isSPACE_LC(nextchr))) |
4633a7c4 |
968 | sayNO; |
76e3520e |
969 | nextchr = UCHARAT(++locinput); |
a0d0e21e |
970 | break; |
bbce6d69 |
971 | case NSPACEL: |
3280af22 |
972 | PL_reg_flags |= RF_tainted; |
bbce6d69 |
973 | /* FALL THROUGH */ |
a0d0e21e |
974 | case NSPACE: |
76e3520e |
975 | if (!nextchr) |
4633a7c4 |
976 | sayNO; |
bbce6d69 |
977 | if (OP(scan) == SPACE |
76e3520e |
978 | ? isSPACE(nextchr) : isSPACE_LC(nextchr)) |
4633a7c4 |
979 | sayNO; |
76e3520e |
980 | nextchr = UCHARAT(++locinput); |
a0d0e21e |
981 | break; |
982 | case DIGIT: |
76e3520e |
983 | if (!isDIGIT(nextchr)) |
4633a7c4 |
984 | sayNO; |
76e3520e |
985 | nextchr = UCHARAT(++locinput); |
a0d0e21e |
986 | break; |
987 | case NDIGIT: |
3280af22 |
988 | if (!nextchr && locinput >= PL_regeol) |
4633a7c4 |
989 | sayNO; |
76e3520e |
990 | if (isDIGIT(nextchr)) |
4633a7c4 |
991 | sayNO; |
76e3520e |
992 | nextchr = UCHARAT(++locinput); |
a0d0e21e |
993 | break; |
c8756f30 |
994 | case REFFL: |
3280af22 |
995 | PL_reg_flags |= RF_tainted; |
c8756f30 |
996 | /* FALL THROUGH */ |
c277df42 |
997 | case REF: |
c8756f30 |
998 | case REFF: |
c277df42 |
999 | n = ARG(scan); /* which paren pair */ |
3280af22 |
1000 | s = PL_regstartp[n]; |
1001 | if (*PL_reglastparen < n || !s) |
af3f8c16 |
1002 | sayNO; /* Do not match unless seen CLOSEn. */ |
3280af22 |
1003 | if (s == PL_regendp[n]) |
a0d0e21e |
1004 | break; |
1005 | /* Inline the first character, for speed. */ |
76e3520e |
1006 | if (UCHARAT(s) != nextchr && |
c8756f30 |
1007 | (OP(scan) == REF || |
1008 | (UCHARAT(s) != ((OP(scan) == REFF |
76e3520e |
1009 | ? fold : fold_locale)[nextchr])))) |
4633a7c4 |
1010 | sayNO; |
3280af22 |
1011 | ln = PL_regendp[n] - s; |
1012 | if (locinput + ln > PL_regeol) |
4633a7c4 |
1013 | sayNO; |
c8756f30 |
1014 | if (ln > 1 && (OP(scan) == REF |
1015 | ? memNE(s, locinput, ln) |
1016 | : (OP(scan) == REFF |
1017 | ? ibcmp(s, locinput, ln) |
1018 | : ibcmp_locale(s, locinput, ln)))) |
4633a7c4 |
1019 | sayNO; |
a0d0e21e |
1020 | locinput += ln; |
76e3520e |
1021 | nextchr = UCHARAT(locinput); |
a0d0e21e |
1022 | break; |
1023 | |
1024 | case NOTHING: |
c277df42 |
1025 | case TAIL: |
a0d0e21e |
1026 | break; |
1027 | case BACK: |
1028 | break; |
c277df42 |
1029 | case EVAL: |
1030 | { |
1031 | dSP; |
533c011a |
1032 | OP_4tree *oop = PL_op; |
3280af22 |
1033 | COP *ocurcop = PL_curcop; |
1034 | SV **ocurpad = PL_curpad; |
c277df42 |
1035 | SV *ret; |
1036 | |
1037 | n = ARG(scan); |
533c011a |
1038 | PL_op = (OP_4tree*)PL_regdata->data[n]; |
1039 | DEBUG_r( PerlIO_printf(Perl_debug_log, " re_eval 0x%x\n", PL_op) ); |
3280af22 |
1040 | PL_curpad = AvARRAY((AV*)PL_regdata->data[n + 1]); |
c277df42 |
1041 | |
76e3520e |
1042 | CALLRUNOPS(); /* Scalar context. */ |
c277df42 |
1043 | SPAGAIN; |
1044 | ret = POPs; |
1045 | PUTBACK; |
1046 | |
1047 | if (logical) { |
1048 | logical = 0; |
1049 | sw = SvTRUE(ret); |
ce862d02 |
1050 | } else |
3280af22 |
1051 | sv_setsv(save_scalar(PL_replgv), ret); |
533c011a |
1052 | PL_op = oop; |
3280af22 |
1053 | PL_curpad = ocurpad; |
1054 | PL_curcop = ocurcop; |
c277df42 |
1055 | break; |
1056 | } |
a0d0e21e |
1057 | case OPEN: |
c277df42 |
1058 | n = ARG(scan); /* which paren pair */ |
3280af22 |
1059 | PL_reg_start_tmp[n] = locinput; |
1060 | if (n > PL_regsize) |
1061 | PL_regsize = n; |
a0d0e21e |
1062 | break; |
1063 | case CLOSE: |
c277df42 |
1064 | n = ARG(scan); /* which paren pair */ |
3280af22 |
1065 | PL_regstartp[n] = PL_reg_start_tmp[n]; |
1066 | PL_regendp[n] = locinput; |
1067 | if (n > *PL_reglastparen) |
1068 | *PL_reglastparen = n; |
a0d0e21e |
1069 | break; |
c277df42 |
1070 | case GROUPP: |
1071 | n = ARG(scan); /* which paren pair */ |
3280af22 |
1072 | sw = (*PL_reglastparen >= n && PL_regendp[n] != NULL); |
c277df42 |
1073 | break; |
1074 | case IFTHEN: |
1075 | if (sw) |
1076 | next = NEXTOPER(NEXTOPER(scan)); |
1077 | else { |
1078 | next = scan + ARG(scan); |
1079 | if (OP(next) == IFTHEN) /* Fake one. */ |
1080 | next = NEXTOPER(NEXTOPER(next)); |
1081 | } |
1082 | break; |
1083 | case LOGICAL: |
1084 | logical = 1; |
1085 | break; |
a0d0e21e |
1086 | case CURLYX: { |
1087 | CURCUR cc; |
3280af22 |
1088 | CHECKPOINT cp = PL_savestack_ix; |
c277df42 |
1089 | |
1090 | if (OP(PREVOPER(next)) == NOTHING) /* LONGJMP */ |
1091 | next += ARG(next); |
3280af22 |
1092 | cc.oldcc = PL_regcc; |
1093 | PL_regcc = &cc; |
1094 | cc.parenfloor = *PL_reglastparen; |
a0d0e21e |
1095 | cc.cur = -1; |
1096 | cc.min = ARG1(scan); |
1097 | cc.max = ARG2(scan); |
c277df42 |
1098 | cc.scan = NEXTOPER(scan) + EXTRA_STEP_2ARGS; |
a0d0e21e |
1099 | cc.next = next; |
1100 | cc.minmod = minmod; |
1101 | cc.lastloc = 0; |
3280af22 |
1102 | PL_reginput = locinput; |
a0d0e21e |
1103 | n = regmatch(PREVOPER(next)); /* start on the WHILEM */ |
1104 | regcpblow(cp); |
3280af22 |
1105 | PL_regcc = cc.oldcc; |
4633a7c4 |
1106 | saySAME(n); |
a0d0e21e |
1107 | } |
1108 | /* NOT REACHED */ |
1109 | case WHILEM: { |
1110 | /* |
1111 | * This is really hard to understand, because after we match |
1112 | * what we're trying to match, we must make sure the rest of |
1113 | * the RE is going to match for sure, and to do that we have |
1114 | * to go back UP the parse tree by recursing ever deeper. And |
1115 | * if it fails, we have to reset our parent's current state |
1116 | * that we can try again after backing off. |
1117 | */ |
1118 | |
c277df42 |
1119 | CHECKPOINT cp, lastcp; |
3280af22 |
1120 | CURCUR* cc = PL_regcc; |
c277df42 |
1121 | char *lastloc = cc->lastloc; /* Detection of 0-len. */ |
1122 | |
4633a7c4 |
1123 | n = cc->cur + 1; /* how many we know we matched */ |
3280af22 |
1124 | PL_reginput = locinput; |
a0d0e21e |
1125 | |
c277df42 |
1126 | DEBUG_r( |
1127 | PerlIO_printf(Perl_debug_log, |
1128 | "%*s %ld out of %ld..%ld cc=%lx\n", |
3280af22 |
1129 | REPORT_CODE_OFF+PL_regindent*2, "", |
c277df42 |
1130 | (long)n, (long)cc->min, |
1131 | (long)cc->max, (long)cc) |
1132 | ); |
4633a7c4 |
1133 | |
a0d0e21e |
1134 | /* If degenerate scan matches "", assume scan done. */ |
1135 | |
579cf2c3 |
1136 | if (locinput == cc->lastloc && n >= cc->min) { |
3280af22 |
1137 | PL_regcc = cc->oldcc; |
1138 | ln = PL_regcc->cur; |
c277df42 |
1139 | DEBUG_r( |
c3464db5 |
1140 | PerlIO_printf(Perl_debug_log, |
1141 | "%*s empty match detected, try continuation...\n", |
3280af22 |
1142 | REPORT_CODE_OFF+PL_regindent*2, "") |
c277df42 |
1143 | ); |
a0d0e21e |
1144 | if (regmatch(cc->next)) |
4633a7c4 |
1145 | sayYES; |
c277df42 |
1146 | DEBUG_r( |
c3464db5 |
1147 | PerlIO_printf(Perl_debug_log, |
1148 | "%*s failed...\n", |
3280af22 |
1149 | REPORT_CODE_OFF+PL_regindent*2, "") |
c277df42 |
1150 | ); |
3280af22 |
1151 | PL_regcc->cur = ln; |
1152 | PL_regcc = cc; |
4633a7c4 |
1153 | sayNO; |
a0d0e21e |
1154 | } |
1155 | |
1156 | /* First just match a string of min scans. */ |
1157 | |
1158 | if (n < cc->min) { |
1159 | cc->cur = n; |
1160 | cc->lastloc = locinput; |
4633a7c4 |
1161 | if (regmatch(cc->scan)) |
1162 | sayYES; |
1163 | cc->cur = n - 1; |
c277df42 |
1164 | cc->lastloc = lastloc; |
1165 | DEBUG_r( |
c3464db5 |
1166 | PerlIO_printf(Perl_debug_log, |
1167 | "%*s failed...\n", |
3280af22 |
1168 | REPORT_CODE_OFF+PL_regindent*2, "") |
c277df42 |
1169 | ); |
4633a7c4 |
1170 | sayNO; |
a0d0e21e |
1171 | } |
1172 | |
1173 | /* Prefer next over scan for minimal matching. */ |
1174 | |
1175 | if (cc->minmod) { |
3280af22 |
1176 | PL_regcc = cc->oldcc; |
1177 | ln = PL_regcc->cur; |
5f05dabc |
1178 | cp = regcppush(cc->parenfloor); |
c277df42 |
1179 | REGCP_SET; |
5f05dabc |
1180 | if (regmatch(cc->next)) { |
c277df42 |
1181 | regcpblow(cp); |
4633a7c4 |
1182 | sayYES; /* All done. */ |
5f05dabc |
1183 | } |
c277df42 |
1184 | REGCP_UNWIND; |
5f05dabc |
1185 | regcppop(); |
3280af22 |
1186 | PL_regcc->cur = ln; |
1187 | PL_regcc = cc; |
a0d0e21e |
1188 | |
c277df42 |
1189 | if (n >= cc->max) { /* Maximum greed exceeded? */ |
3280af22 |
1190 | if (PL_dowarn && n >= REG_INFTY |
1191 | && !(PL_reg_flags & RF_warned)) { |
1192 | PL_reg_flags |= RF_warned; |
2f3ca594 |
1193 | warn("%s limit (%d) exceeded", |
1194 | "Complex regular subexpression recursion", |
1195 | REG_INFTY - 1); |
c277df42 |
1196 | } |
4633a7c4 |
1197 | sayNO; |
c277df42 |
1198 | } |
a687059c |
1199 | |
c277df42 |
1200 | DEBUG_r( |
c3464db5 |
1201 | PerlIO_printf(Perl_debug_log, |
1202 | "%*s trying longer...\n", |
3280af22 |
1203 | REPORT_CODE_OFF+PL_regindent*2, "") |
c277df42 |
1204 | ); |
a0d0e21e |
1205 | /* Try scanning more and see if it helps. */ |
3280af22 |
1206 | PL_reginput = locinput; |
a0d0e21e |
1207 | cc->cur = n; |
1208 | cc->lastloc = locinput; |
5f05dabc |
1209 | cp = regcppush(cc->parenfloor); |
c277df42 |
1210 | REGCP_SET; |
5f05dabc |
1211 | if (regmatch(cc->scan)) { |
c277df42 |
1212 | regcpblow(cp); |
4633a7c4 |
1213 | sayYES; |
5f05dabc |
1214 | } |
c277df42 |
1215 | DEBUG_r( |
c3464db5 |
1216 | PerlIO_printf(Perl_debug_log, |
1217 | "%*s failed...\n", |
3280af22 |
1218 | REPORT_CODE_OFF+PL_regindent*2, "") |
c277df42 |
1219 | ); |
1220 | REGCP_UNWIND; |
5f05dabc |
1221 | regcppop(); |
4633a7c4 |
1222 | cc->cur = n - 1; |
c277df42 |
1223 | cc->lastloc = lastloc; |
4633a7c4 |
1224 | sayNO; |
a0d0e21e |
1225 | } |
1226 | |
1227 | /* Prefer scan over next for maximal matching. */ |
1228 | |
1229 | if (n < cc->max) { /* More greed allowed? */ |
5f05dabc |
1230 | cp = regcppush(cc->parenfloor); |
a0d0e21e |
1231 | cc->cur = n; |
1232 | cc->lastloc = locinput; |
c277df42 |
1233 | REGCP_SET; |
5f05dabc |
1234 | if (regmatch(cc->scan)) { |
c277df42 |
1235 | regcpblow(cp); |
4633a7c4 |
1236 | sayYES; |
5f05dabc |
1237 | } |
c277df42 |
1238 | REGCP_UNWIND; |
a0d0e21e |
1239 | regcppop(); /* Restore some previous $<digit>s? */ |
3280af22 |
1240 | PL_reginput = locinput; |
c277df42 |
1241 | DEBUG_r( |
c3464db5 |
1242 | PerlIO_printf(Perl_debug_log, |
1243 | "%*s failed, try continuation...\n", |
3280af22 |
1244 | REPORT_CODE_OFF+PL_regindent*2, "") |
c277df42 |
1245 | ); |
1246 | } |
3280af22 |
1247 | if (PL_dowarn && n >= REG_INFTY && !(PL_reg_flags & RF_warned)) { |
1248 | PL_reg_flags |= RF_warned; |
cb5d145d |
1249 | warn("%s limit (%d) exceeded", |
1250 | "Complex regular subexpression recursion", |
1251 | REG_INFTY - 1); |
a0d0e21e |
1252 | } |
1253 | |
1254 | /* Failed deeper matches of scan, so see if this one works. */ |
3280af22 |
1255 | PL_regcc = cc->oldcc; |
1256 | ln = PL_regcc->cur; |
a0d0e21e |
1257 | if (regmatch(cc->next)) |
4633a7c4 |
1258 | sayYES; |
c277df42 |
1259 | DEBUG_r( |
c3464db5 |
1260 | PerlIO_printf(Perl_debug_log, "%*s failed...\n", |
3280af22 |
1261 | REPORT_CODE_OFF+PL_regindent*2, "") |
c277df42 |
1262 | ); |
3280af22 |
1263 | PL_regcc->cur = ln; |
1264 | PL_regcc = cc; |
4633a7c4 |
1265 | cc->cur = n - 1; |
c277df42 |
1266 | cc->lastloc = lastloc; |
4633a7c4 |
1267 | sayNO; |
a0d0e21e |
1268 | } |
1269 | /* NOT REACHED */ |
c277df42 |
1270 | case BRANCHJ: |
1271 | next = scan + ARG(scan); |
1272 | if (next == scan) |
1273 | next = NULL; |
1274 | inner = NEXTOPER(NEXTOPER(scan)); |
1275 | goto do_branch; |
1276 | case BRANCH: |
1277 | inner = NEXTOPER(scan); |
1278 | do_branch: |
1279 | { |
1280 | CHECKPOINT lastcp; |
1281 | c1 = OP(scan); |
1282 | if (OP(next) != c1) /* No choice. */ |
1283 | next = inner; /* Avoid recursion. */ |
a0d0e21e |
1284 | else { |
3280af22 |
1285 | int lastparen = *PL_reglastparen; |
c277df42 |
1286 | |
1287 | REGCP_SET; |
a0d0e21e |
1288 | do { |
3280af22 |
1289 | PL_reginput = locinput; |
c277df42 |
1290 | if (regmatch(inner)) |
4633a7c4 |
1291 | sayYES; |
c277df42 |
1292 | REGCP_UNWIND; |
3280af22 |
1293 | for (n = *PL_reglastparen; n > lastparen; n--) |
1294 | PL_regendp[n] = 0; |
1295 | *PL_reglastparen = n; |
c277df42 |
1296 | scan = next; |
a0d0e21e |
1297 | /*SUPPRESS 560*/ |
c277df42 |
1298 | if (n = (c1 == BRANCH ? NEXT_OFF(next) : ARG(next))) |
1299 | next += n; |
a0d0e21e |
1300 | else |
c277df42 |
1301 | next = NULL; |
c277df42 |
1302 | inner = NEXTOPER(scan); |
1303 | if (c1 == BRANCHJ) { |
1304 | inner = NEXTOPER(inner); |
1305 | } |
1306 | } while (scan != NULL && OP(scan) == c1); |
4633a7c4 |
1307 | sayNO; |
a0d0e21e |
1308 | /* NOTREACHED */ |
a687059c |
1309 | } |
a0d0e21e |
1310 | } |
1311 | break; |
1312 | case MINMOD: |
1313 | minmod = 1; |
1314 | break; |
c277df42 |
1315 | case CURLYM: |
1316 | { |
00db4c45 |
1317 | I32 l = 0; |
c277df42 |
1318 | CHECKPOINT lastcp; |
1319 | |
1320 | /* We suppose that the next guy does not need |
1321 | backtracking: in particular, it is of constant length, |
1322 | and has no parenths to influence future backrefs. */ |
1323 | ln = ARG1(scan); /* min to match */ |
1324 | n = ARG2(scan); /* max to match */ |
c277df42 |
1325 | paren = scan->flags; |
1326 | if (paren) { |
3280af22 |
1327 | if (paren > PL_regsize) |
1328 | PL_regsize = paren; |
1329 | if (paren > *PL_reglastparen) |
1330 | *PL_reglastparen = paren; |
c277df42 |
1331 | } |
dc45a647 |
1332 | scan = NEXTOPER(scan) + NODE_STEP_REGNODE; |
c277df42 |
1333 | if (paren) |
1334 | scan += NEXT_OFF(scan); /* Skip former OPEN. */ |
3280af22 |
1335 | PL_reginput = locinput; |
c277df42 |
1336 | if (minmod) { |
1337 | minmod = 0; |
1338 | if (ln && regrepeat_hard(scan, ln, &l) < ln) |
1339 | sayNO; |
5f4b28b2 |
1340 | if (ln && l == 0 && n >= ln |
c277df42 |
1341 | /* In fact, this is tricky. If paren, then the |
1342 | fact that we did/didnot match may influence |
1343 | future execution. */ |
1344 | && !(paren && ln == 0)) |
1345 | ln = n; |
3280af22 |
1346 | locinput = PL_reginput; |
c277df42 |
1347 | if (regkind[(U8)OP(next)] == EXACT) { |
1348 | c1 = UCHARAT(OPERAND(next) + 1); |
1349 | if (OP(next) == EXACTF) |
1350 | c2 = fold[c1]; |
1351 | else if (OP(next) == EXACTFL) |
1352 | c2 = fold_locale[c1]; |
1353 | else |
1354 | c2 = c1; |
1355 | } else |
1356 | c1 = c2 = -1000; |
1357 | REGCP_SET; |
5f4b28b2 |
1358 | /* This may be improved if l == 0. */ |
c277df42 |
1359 | while (n >= ln || (n == REG_INFTY && ln > 0 && l)) { /* ln overflow ? */ |
1360 | /* If it could work, try it. */ |
1361 | if (c1 == -1000 || |
3280af22 |
1362 | UCHARAT(PL_reginput) == c1 || |
1363 | UCHARAT(PL_reginput) == c2) |
c277df42 |
1364 | { |
1365 | if (paren) { |
1366 | if (n) { |
3280af22 |
1367 | PL_regstartp[paren] = PL_reginput - l; |
1368 | PL_regendp[paren] = PL_reginput; |
c277df42 |
1369 | } else |
3280af22 |
1370 | PL_regendp[paren] = NULL; |
c277df42 |
1371 | } |
1372 | if (regmatch(next)) |
1373 | sayYES; |
1374 | REGCP_UNWIND; |
1375 | } |
1376 | /* Couldn't or didn't -- move forward. */ |
3280af22 |
1377 | PL_reginput = locinput; |
c277df42 |
1378 | if (regrepeat_hard(scan, 1, &l)) { |
1379 | ln++; |
3280af22 |
1380 | locinput = PL_reginput; |
c277df42 |
1381 | } |
1382 | else |
1383 | sayNO; |
1384 | } |
1385 | } else { |
1386 | n = regrepeat_hard(scan, n, &l); |
1387 | if (n != 0 && l == 0 |
1388 | /* In fact, this is tricky. If paren, then the |
1389 | fact that we did/didnot match may influence |
1390 | future execution. */ |
1391 | && !(paren && ln == 0)) |
1392 | ln = n; |
3280af22 |
1393 | locinput = PL_reginput; |
c277df42 |
1394 | DEBUG_r( |
5c0ca799 |
1395 | PerlIO_printf(Perl_debug_log, |
1396 | "%*s matched %ld times, len=%ld...\n", |
3280af22 |
1397 | REPORT_CODE_OFF+PL_regindent*2, "", n, l) |
c277df42 |
1398 | ); |
1399 | if (n >= ln) { |
1400 | if (regkind[(U8)OP(next)] == EXACT) { |
1401 | c1 = UCHARAT(OPERAND(next) + 1); |
1402 | if (OP(next) == EXACTF) |
1403 | c2 = fold[c1]; |
1404 | else if (OP(next) == EXACTFL) |
1405 | c2 = fold_locale[c1]; |
1406 | else |
1407 | c2 = c1; |
1408 | } else |
1409 | c1 = c2 = -1000; |
1410 | } |
1411 | REGCP_SET; |
1412 | while (n >= ln) { |
1413 | /* If it could work, try it. */ |
1414 | if (c1 == -1000 || |
3280af22 |
1415 | UCHARAT(PL_reginput) == c1 || |
1416 | UCHARAT(PL_reginput) == c2) |
c277df42 |
1417 | { |
1418 | DEBUG_r( |
c3464db5 |
1419 | PerlIO_printf(Perl_debug_log, |
1420 | "%*s trying tail with n=%ld...\n", |
3280af22 |
1421 | REPORT_CODE_OFF+PL_regindent*2, "", n) |
c277df42 |
1422 | ); |
1423 | if (paren) { |
1424 | if (n) { |
3280af22 |
1425 | PL_regstartp[paren] = PL_reginput - l; |
1426 | PL_regendp[paren] = PL_reginput; |
c277df42 |
1427 | } else |
3280af22 |
1428 | PL_regendp[paren] = NULL; |
c277df42 |
1429 | } |
1430 | if (regmatch(next)) |
1431 | sayYES; |
1432 | REGCP_UNWIND; |
1433 | } |
1434 | /* Couldn't or didn't -- back up. */ |
1435 | n--; |
1436 | locinput -= l; |
3280af22 |
1437 | PL_reginput = locinput; |
c277df42 |
1438 | } |
1439 | } |
1440 | sayNO; |
1441 | break; |
1442 | } |
1443 | case CURLYN: |
1444 | paren = scan->flags; /* Which paren to set */ |
3280af22 |
1445 | if (paren > PL_regsize) |
1446 | PL_regsize = paren; |
1447 | if (paren > *PL_reglastparen) |
1448 | *PL_reglastparen = paren; |
c277df42 |
1449 | ln = ARG1(scan); /* min to match */ |
1450 | n = ARG2(scan); /* max to match */ |
dc45a647 |
1451 | scan = regnext(NEXTOPER(scan) + NODE_STEP_REGNODE); |
c277df42 |
1452 | goto repeat; |
a0d0e21e |
1453 | case CURLY: |
c277df42 |
1454 | paren = 0; |
a0d0e21e |
1455 | ln = ARG1(scan); /* min to match */ |
1456 | n = ARG2(scan); /* max to match */ |
dc45a647 |
1457 | scan = NEXTOPER(scan) + NODE_STEP_REGNODE; |
a0d0e21e |
1458 | goto repeat; |
1459 | case STAR: |
1460 | ln = 0; |
c277df42 |
1461 | n = REG_INFTY; |
a0d0e21e |
1462 | scan = NEXTOPER(scan); |
c277df42 |
1463 | paren = 0; |
a0d0e21e |
1464 | goto repeat; |
1465 | case PLUS: |
c277df42 |
1466 | ln = 1; |
1467 | n = REG_INFTY; |
1468 | scan = NEXTOPER(scan); |
1469 | paren = 0; |
1470 | repeat: |
a0d0e21e |
1471 | /* |
1472 | * Lookahead to avoid useless match attempts |
1473 | * when we know what character comes next. |
1474 | */ |
bbce6d69 |
1475 | if (regkind[(U8)OP(next)] == EXACT) { |
1476 | c1 = UCHARAT(OPERAND(next) + 1); |
1477 | if (OP(next) == EXACTF) |
1478 | c2 = fold[c1]; |
1479 | else if (OP(next) == EXACTFL) |
1480 | c2 = fold_locale[c1]; |
1481 | else |
1482 | c2 = c1; |
1483 | } |
a0d0e21e |
1484 | else |
bbce6d69 |
1485 | c1 = c2 = -1000; |
3280af22 |
1486 | PL_reginput = locinput; |
a0d0e21e |
1487 | if (minmod) { |
c277df42 |
1488 | CHECKPOINT lastcp; |
a0d0e21e |
1489 | minmod = 0; |
1490 | if (ln && regrepeat(scan, ln) < ln) |
4633a7c4 |
1491 | sayNO; |
c277df42 |
1492 | REGCP_SET; |
1493 | while (n >= ln || (n == REG_INFTY && ln > 0)) { /* ln overflow ? */ |
a0d0e21e |
1494 | /* If it could work, try it. */ |
bbce6d69 |
1495 | if (c1 == -1000 || |
3280af22 |
1496 | UCHARAT(PL_reginput) == c1 || |
1497 | UCHARAT(PL_reginput) == c2) |
bbce6d69 |
1498 | { |
c277df42 |
1499 | if (paren) { |
1500 | if (n) { |
3280af22 |
1501 | PL_regstartp[paren] = PL_reginput - 1; |
1502 | PL_regendp[paren] = PL_reginput; |
c277df42 |
1503 | } else |
3280af22 |
1504 | PL_regendp[paren] = NULL; |
c277df42 |
1505 | } |
a0d0e21e |
1506 | if (regmatch(next)) |
4633a7c4 |
1507 | sayYES; |
c277df42 |
1508 | REGCP_UNWIND; |
bbce6d69 |
1509 | } |
c277df42 |
1510 | /* Couldn't or didn't -- move forward. */ |
3280af22 |
1511 | PL_reginput = locinput + ln; |
a0d0e21e |
1512 | if (regrepeat(scan, 1)) { |
1513 | ln++; |
3280af22 |
1514 | PL_reginput = locinput + ln; |
c277df42 |
1515 | } else |
4633a7c4 |
1516 | sayNO; |
a0d0e21e |
1517 | } |
1518 | } |
1519 | else { |
c277df42 |
1520 | CHECKPOINT lastcp; |
a0d0e21e |
1521 | n = regrepeat(scan, n); |
1522 | if (ln < n && regkind[(U8)OP(next)] == EOL && |
3280af22 |
1523 | (!PL_multiline || OP(next) == SEOL)) |
a0d0e21e |
1524 | ln = n; /* why back off? */ |
c277df42 |
1525 | REGCP_SET; |
1526 | if (paren) { |
1527 | while (n >= ln) { |
1528 | /* If it could work, try it. */ |
1529 | if (c1 == -1000 || |
3280af22 |
1530 | UCHARAT(PL_reginput) == c1 || |
1531 | UCHARAT(PL_reginput) == c2) |
c277df42 |
1532 | { |
1533 | if (paren && n) { |
1534 | if (n) { |
3280af22 |
1535 | PL_regstartp[paren] = PL_reginput - 1; |
1536 | PL_regendp[paren] = PL_reginput; |
c277df42 |
1537 | } else |
3280af22 |
1538 | PL_regendp[paren] = NULL; |
c277df42 |
1539 | } |
1540 | if (regmatch(next)) |
1541 | sayYES; |
1542 | REGCP_UNWIND; |
1543 | } |
1544 | /* Couldn't or didn't -- back up. */ |
1545 | n--; |
3280af22 |
1546 | PL_reginput = locinput + n; |
c277df42 |
1547 | } |
1548 | } else { |
1549 | while (n >= ln) { |
1550 | /* If it could work, try it. */ |
1551 | if (c1 == -1000 || |
3280af22 |
1552 | UCHARAT(PL_reginput) == c1 || |
1553 | UCHARAT(PL_reginput) == c2) |
c277df42 |
1554 | { |
1555 | if (regmatch(next)) |
1556 | sayYES; |
1557 | REGCP_UNWIND; |
1558 | } |
1559 | /* Couldn't or didn't -- back up. */ |
1560 | n--; |
3280af22 |
1561 | PL_reginput = locinput + n; |
bbce6d69 |
1562 | } |
a0d0e21e |
1563 | } |
1564 | } |
4633a7c4 |
1565 | sayNO; |
c277df42 |
1566 | break; |
a0d0e21e |
1567 | case END: |
3280af22 |
1568 | if (locinput < PL_regtill) |
7e5428c5 |
1569 | sayNO; /* Cannot match: too short. */ |
1570 | /* Fall through */ |
1571 | case SUCCEED: |
3280af22 |
1572 | PL_reginput = locinput; /* put where regtry can find it */ |
4633a7c4 |
1573 | sayYES; /* Success! */ |
c277df42 |
1574 | case SUSPEND: |
1575 | n = 1; |
1576 | goto do_ifmatch; |
a0d0e21e |
1577 | case UNLESSM: |
c277df42 |
1578 | n = 0; |
3280af22 |
1579 | if (locinput < PL_bostr + scan->flags) |
c277df42 |
1580 | goto say_yes; |
1581 | goto do_ifmatch; |
1582 | case IFMATCH: |
1583 | n = 1; |
3280af22 |
1584 | if (locinput < PL_bostr + scan->flags) |
c277df42 |
1585 | goto say_no; |
1586 | do_ifmatch: |
3280af22 |
1587 | PL_reginput = locinput - scan->flags; |
c277df42 |
1588 | inner = NEXTOPER(NEXTOPER(scan)); |
1589 | if (regmatch(inner) != n) { |
1590 | say_no: |
1591 | if (logical) { |
1592 | logical = 0; |
1593 | sw = 0; |
1594 | goto do_longjump; |
1595 | } else |
1596 | sayNO; |
1597 | } |
1598 | say_yes: |
1599 | if (logical) { |
1600 | logical = 0; |
1601 | sw = 1; |
1602 | } |
fe44a5e8 |
1603 | if (OP(scan) == SUSPEND) { |
3280af22 |
1604 | locinput = PL_reginput; |
565764a8 |
1605 | nextchr = UCHARAT(locinput); |
fe44a5e8 |
1606 | } |
c277df42 |
1607 | /* FALL THROUGH. */ |
1608 | case LONGJMP: |
1609 | do_longjump: |
1610 | next = scan + ARG(scan); |
1611 | if (next == scan) |
1612 | next = NULL; |
a0d0e21e |
1613 | break; |
1614 | default: |
c030ccd9 |
1615 | PerlIO_printf(PerlIO_stderr(), "%lx %d\n", |
c277df42 |
1616 | (unsigned long)scan, OP(scan)); |
a0d0e21e |
1617 | FAIL("regexp memory corruption"); |
a687059c |
1618 | } |
a0d0e21e |
1619 | scan = next; |
1620 | } |
a687059c |
1621 | |
a0d0e21e |
1622 | /* |
1623 | * We get here only if there's trouble -- normally "case END" is |
1624 | * the terminating point. |
1625 | */ |
1626 | FAIL("corrupted regexp pointers"); |
1627 | /*NOTREACHED*/ |
4633a7c4 |
1628 | sayNO; |
1629 | |
1630 | yes: |
1631 | #ifdef DEBUGGING |
3280af22 |
1632 | PL_regindent--; |
4633a7c4 |
1633 | #endif |
1634 | return 1; |
1635 | |
1636 | no: |
1637 | #ifdef DEBUGGING |
3280af22 |
1638 | PL_regindent--; |
4633a7c4 |
1639 | #endif |
a0d0e21e |
1640 | return 0; |
a687059c |
1641 | } |
1642 | |
1643 | /* |
1644 | - regrepeat - repeatedly match something simple, report how many |
1645 | */ |
1646 | /* |
1647 | * [This routine now assumes that it will only match on things of length 1. |
1648 | * That was true before, but now we assume scan - reginput is the count, |
1649 | * rather than incrementing count on every character.] |
1650 | */ |
76e3520e |
1651 | STATIC I32 |
c277df42 |
1652 | regrepeat(regnode *p, I32 max) |
a687059c |
1653 | { |
5c0ca799 |
1654 | dTHR; |
a0d0e21e |
1655 | register char *scan; |
1656 | register char *opnd; |
1657 | register I32 c; |
3280af22 |
1658 | register char *loceol = PL_regeol; |
a0d0e21e |
1659 | |
3280af22 |
1660 | scan = PL_reginput; |
c277df42 |
1661 | if (max != REG_INFTY && max < loceol - scan) |
a0d0e21e |
1662 | loceol = scan + max; |
161b471a |
1663 | opnd = (char *) OPERAND(p); |
a0d0e21e |
1664 | switch (OP(p)) { |
1665 | case ANY: |
1666 | while (scan < loceol && *scan != '\n') |
1667 | scan++; |
1668 | break; |
1669 | case SANY: |
1670 | scan = loceol; |
1671 | break; |
bbce6d69 |
1672 | case EXACT: /* length of string is 1 */ |
1673 | c = UCHARAT(++opnd); |
1674 | while (scan < loceol && UCHARAT(scan) == c) |
1675 | scan++; |
1676 | break; |
1677 | case EXACTF: /* length of string is 1 */ |
1678 | c = UCHARAT(++opnd); |
1679 | while (scan < loceol && |
1680 | (UCHARAT(scan) == c || UCHARAT(scan) == fold[c])) |
1681 | scan++; |
1682 | break; |
1683 | case EXACTFL: /* length of string is 1 */ |
3280af22 |
1684 | PL_reg_flags |= RF_tainted; |
bbce6d69 |
1685 | c = UCHARAT(++opnd); |
1686 | while (scan < loceol && |
1687 | (UCHARAT(scan) == c || UCHARAT(scan) == fold_locale[c])) |
a0d0e21e |
1688 | scan++; |
1689 | break; |
1690 | case ANYOF: |
ae5c130c |
1691 | while (scan < loceol && REGINCLASS(opnd, *scan)) |
a0d0e21e |
1692 | scan++; |
a0d0e21e |
1693 | break; |
1694 | case ALNUM: |
1695 | while (scan < loceol && isALNUM(*scan)) |
1696 | scan++; |
1697 | break; |
bbce6d69 |
1698 | case ALNUML: |
3280af22 |
1699 | PL_reg_flags |= RF_tainted; |
bbce6d69 |
1700 | while (scan < loceol && isALNUM_LC(*scan)) |
1701 | scan++; |
1702 | break; |
a0d0e21e |
1703 | case NALNUM: |
1704 | while (scan < loceol && !isALNUM(*scan)) |
1705 | scan++; |
1706 | break; |
bbce6d69 |
1707 | case NALNUML: |
3280af22 |
1708 | PL_reg_flags |= RF_tainted; |
bbce6d69 |
1709 | while (scan < loceol && !isALNUM_LC(*scan)) |
1710 | scan++; |
1711 | break; |
a0d0e21e |
1712 | case SPACE: |
1713 | while (scan < loceol && isSPACE(*scan)) |
1714 | scan++; |
1715 | break; |
bbce6d69 |
1716 | case SPACEL: |
3280af22 |
1717 | PL_reg_flags |= RF_tainted; |
bbce6d69 |
1718 | while (scan < loceol && isSPACE_LC(*scan)) |
1719 | scan++; |
1720 | break; |
a0d0e21e |
1721 | case NSPACE: |
1722 | while (scan < loceol && !isSPACE(*scan)) |
1723 | scan++; |
1724 | break; |
bbce6d69 |
1725 | case NSPACEL: |
3280af22 |
1726 | PL_reg_flags |= RF_tainted; |
bbce6d69 |
1727 | while (scan < loceol && !isSPACE_LC(*scan)) |
1728 | scan++; |
1729 | break; |
a0d0e21e |
1730 | case DIGIT: |
1731 | while (scan < loceol && isDIGIT(*scan)) |
1732 | scan++; |
1733 | break; |
1734 | case NDIGIT: |
1735 | while (scan < loceol && !isDIGIT(*scan)) |
1736 | scan++; |
1737 | break; |
1738 | default: /* Called on something of 0 width. */ |
1739 | break; /* So match right here or not at all. */ |
1740 | } |
a687059c |
1741 | |
3280af22 |
1742 | c = scan - PL_reginput; |
1743 | PL_reginput = scan; |
a687059c |
1744 | |
c277df42 |
1745 | DEBUG_r( |
1746 | { |
1747 | SV *prop = sv_newmortal(); |
1748 | |
1749 | regprop(prop, p); |
1750 | PerlIO_printf(Perl_debug_log, |
1751 | "%*s %s can match %ld times out of %ld...\n", |
1752 | REPORT_CODE_OFF+1, "", SvPVX(prop),c,max); |
1753 | }); |
1754 | |
a0d0e21e |
1755 | return(c); |
a687059c |
1756 | } |
1757 | |
1758 | /* |
c277df42 |
1759 | - regrepeat_hard - repeatedly match something, report total lenth and length |
1760 | * |
1761 | * The repeater is supposed to have constant length. |
1762 | */ |
1763 | |
76e3520e |
1764 | STATIC I32 |
c277df42 |
1765 | regrepeat_hard(regnode *p, I32 max, I32 *lp) |
1766 | { |
5c0ca799 |
1767 | dTHR; |
c277df42 |
1768 | register char *scan; |
1769 | register char *start; |
3280af22 |
1770 | register char *loceol = PL_regeol; |
c277df42 |
1771 | I32 l = -1; |
1772 | |
3280af22 |
1773 | start = PL_reginput; |
1774 | while (PL_reginput < loceol && (scan = PL_reginput, regmatch(p))) { |
c277df42 |
1775 | if (l == -1) { |
3280af22 |
1776 | *lp = l = PL_reginput - start; |
c277df42 |
1777 | if (max != REG_INFTY && l*max < loceol - scan) |
1778 | loceol = scan + l*max; |
1779 | if (l == 0) { |
1780 | return max; |
1781 | } |
1782 | } |
1783 | } |
3280af22 |
1784 | if (PL_reginput < loceol) |
1785 | PL_reginput = scan; |
c277df42 |
1786 | else |
3280af22 |
1787 | scan = PL_reginput; |
c277df42 |
1788 | |
1789 | return (scan - start)/l; |
1790 | } |
1791 | |
1792 | /* |
bbce6d69 |
1793 | - regclass - determine if a character falls into a character class |
1794 | */ |
1795 | |
76e3520e |
1796 | STATIC bool |
8ac85365 |
1797 | reginclass(register char *p, register I32 c) |
bbce6d69 |
1798 | { |
5c0ca799 |
1799 | dTHR; |
bbce6d69 |
1800 | char flags = *p; |
1801 | bool match = FALSE; |
1802 | |
1803 | c &= 0xFF; |
ae5c130c |
1804 | if (ANYOF_TEST(p, c)) |
bbce6d69 |
1805 | match = TRUE; |
1806 | else if (flags & ANYOF_FOLD) { |
1807 | I32 cf; |
1808 | if (flags & ANYOF_LOCALE) { |
3280af22 |
1809 | PL_reg_flags |= RF_tainted; |
bbce6d69 |
1810 | cf = fold_locale[c]; |
1811 | } |
1812 | else |
1813 | cf = fold[c]; |
ae5c130c |
1814 | if (ANYOF_TEST(p, cf)) |
bbce6d69 |
1815 | match = TRUE; |
1816 | } |
1817 | |
1818 | if (!match && (flags & ANYOF_ISA)) { |
3280af22 |
1819 | PL_reg_flags |= RF_tainted; |
bbce6d69 |
1820 | |
1821 | if (((flags & ANYOF_ALNUML) && isALNUM_LC(c)) || |
1822 | ((flags & ANYOF_NALNUML) && !isALNUM_LC(c)) || |
1823 | ((flags & ANYOF_SPACEL) && isSPACE_LC(c)) || |
1824 | ((flags & ANYOF_NSPACEL) && !isSPACE_LC(c))) |
1825 | { |
1826 | match = TRUE; |
1827 | } |
1828 | } |
1829 | |
ae5c130c |
1830 | return (flags & ANYOF_INVERT) ? !match : match; |
bbce6d69 |
1831 | } |
1832 | |
161b471a |
1833 | |
1834 | |