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Update mojo sdk to rev 1dc8a9a5db73d3718d99917fadf31f5fb2ebad4f
[chromium-blink-merge.git] / third_party / libxml / src / xmlregexp.c
blobfeae87460ed5b58923b78c9dd76ed3deb98a4999
1 /*
2 * regexp.c: generic and extensible Regular Expression engine
3 *
4 * Basically designed with the purpose of compiling regexps for
5 * the variety of validation/shemas mechanisms now available in
6 * XML related specifications these include:
7 * - XML-1.0 DTD validation
8 * - XML Schemas structure part 1
9 * - XML Schemas Datatypes part 2 especially Appendix F
10 * - RELAX-NG/TREX i.e. the counter proposal
11 *
12 * See Copyright for the status of this software.
13 *
14 * Daniel Veillard <veillard@redhat.com>
15 */
16
17 #define IN_LIBXML
18 #include "libxml.h"
19
20 #ifdef LIBXML_REGEXP_ENABLED
21
22 /* #define DEBUG_ERR */
23
24 #include <stdio.h>
25 #include <string.h>
26 #ifdef HAVE_LIMITS_H
27 #include <limits.h>
28 #endif
29
30 #include <libxml/tree.h>
31 #include <libxml/parserInternals.h>
32 #include <libxml/xmlregexp.h>
33 #include <libxml/xmlautomata.h>
34 #include <libxml/xmlunicode.h>
35
36 #ifndef INT_MAX
37 #define INT_MAX 123456789 /* easy to flag and big enough for our needs */
38 #endif
39
40 /* #define DEBUG_REGEXP_GRAPH */
41 /* #define DEBUG_REGEXP_EXEC */
42 /* #define DEBUG_PUSH */
43 /* #define DEBUG_COMPACTION */
44
45 #define MAX_PUSH 10000000
46
47 #define ERROR(str) \
48 ctxt->error = XML_REGEXP_COMPILE_ERROR; \
49 xmlRegexpErrCompile(ctxt, str);
50 #define NEXT ctxt->cur++
51 #define CUR (*(ctxt->cur))
52 #define NXT(index) (ctxt->cur[index])
53
54 #define CUR_SCHAR(s, l) xmlStringCurrentChar(NULL, s, &l)
55 #define NEXTL(l) ctxt->cur += l;
56 #define XML_REG_STRING_SEPARATOR '|'
57 /*
58 * Need PREV to check on a '-' within a Character Group. May only be used
59 * when it's guaranteed that cur is not at the beginning of ctxt->string!
60 */
61 #define PREV (ctxt->cur[-1])
62
63 /**
64 * TODO:
65 *
66 * macro to flag unimplemented blocks
67 */
68 #define TODO \
69 xmlGenericError(xmlGenericErrorContext, \
70 "Unimplemented block at %s:%d\n", \
71 __FILE__, __LINE__);
72
73 /************************************************************************
74 * *
75 * Datatypes and structures *
76 * *
77 ************************************************************************/
78
79 /*
80 * Note: the order of the enums below is significant, do not shuffle
81 */
82 typedef enum {
83 XML_REGEXP_EPSILON = 1,
84 XML_REGEXP_CHARVAL,
85 XML_REGEXP_RANGES,
86 XML_REGEXP_SUBREG, /* used for () sub regexps */
87 XML_REGEXP_STRING,
88 XML_REGEXP_ANYCHAR, /* . */
89 XML_REGEXP_ANYSPACE, /* \s */
90 XML_REGEXP_NOTSPACE, /* \S */
91 XML_REGEXP_INITNAME, /* \l */
92 XML_REGEXP_NOTINITNAME, /* \L */
93 XML_REGEXP_NAMECHAR, /* \c */
94 XML_REGEXP_NOTNAMECHAR, /* \C */
95 XML_REGEXP_DECIMAL, /* \d */
96 XML_REGEXP_NOTDECIMAL, /* \D */
97 XML_REGEXP_REALCHAR, /* \w */
98 XML_REGEXP_NOTREALCHAR, /* \W */
99 XML_REGEXP_LETTER = 100,
100 XML_REGEXP_LETTER_UPPERCASE,
101 XML_REGEXP_LETTER_LOWERCASE,
102 XML_REGEXP_LETTER_TITLECASE,
103 XML_REGEXP_LETTER_MODIFIER,
104 XML_REGEXP_LETTER_OTHERS,
105 XML_REGEXP_MARK,
106 XML_REGEXP_MARK_NONSPACING,
107 XML_REGEXP_MARK_SPACECOMBINING,
108 XML_REGEXP_MARK_ENCLOSING,
109 XML_REGEXP_NUMBER,
110 XML_REGEXP_NUMBER_DECIMAL,
111 XML_REGEXP_NUMBER_LETTER,
112 XML_REGEXP_NUMBER_OTHERS,
113 XML_REGEXP_PUNCT,
114 XML_REGEXP_PUNCT_CONNECTOR,
115 XML_REGEXP_PUNCT_DASH,
116 XML_REGEXP_PUNCT_OPEN,
117 XML_REGEXP_PUNCT_CLOSE,
118 XML_REGEXP_PUNCT_INITQUOTE,
119 XML_REGEXP_PUNCT_FINQUOTE,
120 XML_REGEXP_PUNCT_OTHERS,
121 XML_REGEXP_SEPAR,
122 XML_REGEXP_SEPAR_SPACE,
123 XML_REGEXP_SEPAR_LINE,
124 XML_REGEXP_SEPAR_PARA,
125 XML_REGEXP_SYMBOL,
126 XML_REGEXP_SYMBOL_MATH,
127 XML_REGEXP_SYMBOL_CURRENCY,
128 XML_REGEXP_SYMBOL_MODIFIER,
129 XML_REGEXP_SYMBOL_OTHERS,
130 XML_REGEXP_OTHER,
131 XML_REGEXP_OTHER_CONTROL,
132 XML_REGEXP_OTHER_FORMAT,
133 XML_REGEXP_OTHER_PRIVATE,
134 XML_REGEXP_OTHER_NA,
135 XML_REGEXP_BLOCK_NAME
136 } xmlRegAtomType;
137
138 typedef enum {
139 XML_REGEXP_QUANT_EPSILON = 1,
140 XML_REGEXP_QUANT_ONCE,
141 XML_REGEXP_QUANT_OPT,
142 XML_REGEXP_QUANT_MULT,
143 XML_REGEXP_QUANT_PLUS,
144 XML_REGEXP_QUANT_ONCEONLY,
145 XML_REGEXP_QUANT_ALL,
146 XML_REGEXP_QUANT_RANGE
147 } xmlRegQuantType;
148
149 typedef enum {
150 XML_REGEXP_START_STATE = 1,
151 XML_REGEXP_FINAL_STATE,
152 XML_REGEXP_TRANS_STATE,
153 XML_REGEXP_SINK_STATE,
154 XML_REGEXP_UNREACH_STATE
155 } xmlRegStateType;
156
157 typedef enum {
158 XML_REGEXP_MARK_NORMAL = 0,
159 XML_REGEXP_MARK_START,
160 XML_REGEXP_MARK_VISITED
161 } xmlRegMarkedType;
162
163 typedef struct _xmlRegRange xmlRegRange;
164 typedef xmlRegRange *xmlRegRangePtr;
165
166 struct _xmlRegRange {
167 int neg; /* 0 normal, 1 not, 2 exclude */
168 xmlRegAtomType type;
169 int start;
170 int end;
171 xmlChar *blockName;
172 };
173
174 typedef struct _xmlRegAtom xmlRegAtom;
175 typedef xmlRegAtom *xmlRegAtomPtr;
176
177 typedef struct _xmlAutomataState xmlRegState;
178 typedef xmlRegState *xmlRegStatePtr;
179
180 struct _xmlRegAtom {
181 int no;
182 xmlRegAtomType type;
183 xmlRegQuantType quant;
184 int min;
185 int max;
186
187 void *valuep;
188 void *valuep2;
189 int neg;
190 int codepoint;
191 xmlRegStatePtr start;
192 xmlRegStatePtr start0;
193 xmlRegStatePtr stop;
194 int maxRanges;
195 int nbRanges;
196 xmlRegRangePtr *ranges;
197 void *data;
198 };
199
200 typedef struct _xmlRegCounter xmlRegCounter;
201 typedef xmlRegCounter *xmlRegCounterPtr;
202
203 struct _xmlRegCounter {
204 int min;
205 int max;
206 };
207
208 typedef struct _xmlRegTrans xmlRegTrans;
209 typedef xmlRegTrans *xmlRegTransPtr;
210
211 struct _xmlRegTrans {
212 xmlRegAtomPtr atom;
213 int to;
214 int counter;
215 int count;
216 int nd;
217 };
218
219 struct _xmlAutomataState {
220 xmlRegStateType type;
221 xmlRegMarkedType mark;
222 xmlRegMarkedType reached;
223 int no;
224 int maxTrans;
225 int nbTrans;
226 xmlRegTrans *trans;
227 /* knowing states ponting to us can speed things up */
228 int maxTransTo;
229 int nbTransTo;
230 int *transTo;
231 };
232
233 typedef struct _xmlAutomata xmlRegParserCtxt;
234 typedef xmlRegParserCtxt *xmlRegParserCtxtPtr;
235
236 #define AM_AUTOMATA_RNG 1
237
238 struct _xmlAutomata {
239 xmlChar *string;
240 xmlChar *cur;
241
242 int error;
243 int neg;
244
245 xmlRegStatePtr start;
246 xmlRegStatePtr end;
247 xmlRegStatePtr state;
248
249 xmlRegAtomPtr atom;
250
251 int maxAtoms;
252 int nbAtoms;
253 xmlRegAtomPtr *atoms;
254
255 int maxStates;
256 int nbStates;
257 xmlRegStatePtr *states;
258
259 int maxCounters;
260 int nbCounters;
261 xmlRegCounter *counters;
262
263 int determinist;
264 int negs;
265 int flags;
266 };
267
268 struct _xmlRegexp {
269 xmlChar *string;
270 int nbStates;
271 xmlRegStatePtr *states;
272 int nbAtoms;
273 xmlRegAtomPtr *atoms;
274 int nbCounters;
275 xmlRegCounter *counters;
276 int determinist;
277 int flags;
278 /*
279 * That's the compact form for determinists automatas
280 */
281 int nbstates;
282 int *compact;
283 void **transdata;
284 int nbstrings;
285 xmlChar **stringMap;
286 };
287
288 typedef struct _xmlRegExecRollback xmlRegExecRollback;
289 typedef xmlRegExecRollback *xmlRegExecRollbackPtr;
290
291 struct _xmlRegExecRollback {
292 xmlRegStatePtr state;/* the current state */
293 int index; /* the index in the input stack */
294 int nextbranch; /* the next transition to explore in that state */
295 int *counts; /* save the automata state if it has some */
296 };
297
298 typedef struct _xmlRegInputToken xmlRegInputToken;
299 typedef xmlRegInputToken *xmlRegInputTokenPtr;
300
301 struct _xmlRegInputToken {
302 xmlChar *value;
303 void *data;
304 };
305
306 struct _xmlRegExecCtxt {
307 int status; /* execution status != 0 indicate an error */
308 int determinist; /* did we find an indeterministic behaviour */
309 xmlRegexpPtr comp; /* the compiled regexp */
310 xmlRegExecCallbacks callback;
311 void *data;
312
313 xmlRegStatePtr state;/* the current state */
314 int transno; /* the current transition on that state */
315 int transcount; /* the number of chars in char counted transitions */
316
317 /*
318 * A stack of rollback states
319 */
320 int maxRollbacks;
321 int nbRollbacks;
322 xmlRegExecRollback *rollbacks;
323
324 /*
325 * The state of the automata if any
326 */
327 int *counts;
328
329 /*
330 * The input stack
331 */
332 int inputStackMax;
333 int inputStackNr;
334 int index;
335 int *charStack;
336 const xmlChar *inputString; /* when operating on characters */
337 xmlRegInputTokenPtr inputStack;/* when operating on strings */
338
339 /*
340 * error handling
341 */
342 int errStateNo; /* the error state number */
343 xmlRegStatePtr errState; /* the error state */
344 xmlChar *errString; /* the string raising the error */
345 int *errCounts; /* counters at the error state */
346 int nbPush;
347 };
348
349 #define REGEXP_ALL_COUNTER 0x123456
350 #define REGEXP_ALL_LAX_COUNTER 0x123457
351
352 static void xmlFAParseRegExp(xmlRegParserCtxtPtr ctxt, int top);
353 static void xmlRegFreeState(xmlRegStatePtr state);
354 static void xmlRegFreeAtom(xmlRegAtomPtr atom);
355 static int xmlRegStrEqualWildcard(const xmlChar *expStr, const xmlChar *valStr);
356 static int xmlRegCheckCharacter(xmlRegAtomPtr atom, int codepoint);
357 static int xmlRegCheckCharacterRange(xmlRegAtomType type, int codepoint,
358 int neg, int start, int end, const xmlChar *blockName);
359
360 void xmlAutomataSetFlags(xmlAutomataPtr am, int flags);
361
362 /************************************************************************
363 * *
364 * Regexp memory error handler *
365 * *
366 ************************************************************************/
367 /**
368 * xmlRegexpErrMemory:
369 * @extra: extra information
370 *
371 * Handle an out of memory condition
372 */
373 static void
374 xmlRegexpErrMemory(xmlRegParserCtxtPtr ctxt, const char *extra)
375 {
376 const char *regexp = NULL;
377 if (ctxt != NULL) {
378 regexp = (const char *) ctxt->string;
379 ctxt->error = XML_ERR_NO_MEMORY;
380 }
381 __xmlRaiseError(NULL, NULL, NULL, NULL, NULL, XML_FROM_REGEXP,
382 XML_ERR_NO_MEMORY, XML_ERR_FATAL, NULL, 0, extra,
383 regexp, NULL, 0, 0,
384 "Memory allocation failed : %s\n", extra);
385 }
386
387 /**
388 * xmlRegexpErrCompile:
389 * @extra: extra information
390 *
391 * Handle a compilation failure
392 */
393 static void
394 xmlRegexpErrCompile(xmlRegParserCtxtPtr ctxt, const char *extra)
395 {
396 const char *regexp = NULL;
397 int idx = 0;
398
399 if (ctxt != NULL) {
400 regexp = (const char *) ctxt->string;
401 idx = ctxt->cur - ctxt->string;
402 ctxt->error = XML_REGEXP_COMPILE_ERROR;
403 }
404 __xmlRaiseError(NULL, NULL, NULL, NULL, NULL, XML_FROM_REGEXP,
405 XML_REGEXP_COMPILE_ERROR, XML_ERR_FATAL, NULL, 0, extra,
406 regexp, NULL, idx, 0,
407 "failed to compile: %s\n", extra);
408 }
409
410 /************************************************************************
411 * *
412 * Allocation/Deallocation *
413 * *
414 ************************************************************************/
415
416 static int xmlFAComputesDeterminism(xmlRegParserCtxtPtr ctxt);
417 /**
418 * xmlRegEpxFromParse:
419 * @ctxt: the parser context used to build it
420 *
421 * Allocate a new regexp and fill it with the result from the parser
422 *
423 * Returns the new regexp or NULL in case of error
424 */
425 static xmlRegexpPtr
426 xmlRegEpxFromParse(xmlRegParserCtxtPtr ctxt) {
427 xmlRegexpPtr ret;
428
429 ret = (xmlRegexpPtr) xmlMalloc(sizeof(xmlRegexp));
430 if (ret == NULL) {
431 xmlRegexpErrMemory(ctxt, "compiling regexp");
432 return(NULL);
433 }
434 memset(ret, 0, sizeof(xmlRegexp));
435 ret->string = ctxt->string;
436 ret->nbStates = ctxt->nbStates;
437 ret->states = ctxt->states;
438 ret->nbAtoms = ctxt->nbAtoms;
439 ret->atoms = ctxt->atoms;
440 ret->nbCounters = ctxt->nbCounters;
441 ret->counters = ctxt->counters;
442 ret->determinist = ctxt->determinist;
443 ret->flags = ctxt->flags;
444 if (ret->determinist == -1) {
445 xmlRegexpIsDeterminist(ret);
446 }
447
448 if ((ret->determinist != 0) &&
449 (ret->nbCounters == 0) &&
450 (ctxt->negs == 0) &&
451 (ret->atoms != NULL) &&
452 (ret->atoms[0] != NULL) &&
453 (ret->atoms[0]->type == XML_REGEXP_STRING)) {
454 int i, j, nbstates = 0, nbatoms = 0;
455 int *stateRemap;
456 int *stringRemap;
457 int *transitions;
458 void **transdata;
459 xmlChar **stringMap;
460 xmlChar *value;
461
462 /*
463 * Switch to a compact representation
464 * 1/ counting the effective number of states left
465 * 2/ counting the unique number of atoms, and check that
466 * they are all of the string type
467 * 3/ build a table state x atom for the transitions
468 */
469
470 stateRemap = xmlMalloc(ret->nbStates * sizeof(int));
471 if (stateRemap == NULL) {
472 xmlRegexpErrMemory(ctxt, "compiling regexp");
473 xmlFree(ret);
474 return(NULL);
475 }
476 for (i = 0;i < ret->nbStates;i++) {
477 if (ret->states[i] != NULL) {
478 stateRemap[i] = nbstates;
479 nbstates++;
480 } else {
481 stateRemap[i] = -1;
482 }
483 }
484 #ifdef DEBUG_COMPACTION
485 printf("Final: %d states\n", nbstates);
486 #endif
487 stringMap = xmlMalloc(ret->nbAtoms * sizeof(char *));
488 if (stringMap == NULL) {
489 xmlRegexpErrMemory(ctxt, "compiling regexp");
490 xmlFree(stateRemap);
491 xmlFree(ret);
492 return(NULL);
493 }
494 stringRemap = xmlMalloc(ret->nbAtoms * sizeof(int));
495 if (stringRemap == NULL) {
496 xmlRegexpErrMemory(ctxt, "compiling regexp");
497 xmlFree(stringMap);
498 xmlFree(stateRemap);
499 xmlFree(ret);
500 return(NULL);
501 }
502 for (i = 0;i < ret->nbAtoms;i++) {
503 if ((ret->atoms[i]->type == XML_REGEXP_STRING) &&
504 (ret->atoms[i]->quant == XML_REGEXP_QUANT_ONCE)) {
505 value = ret->atoms[i]->valuep;
506 for (j = 0;j < nbatoms;j++) {
507 if (xmlStrEqual(stringMap[j], value)) {
508 stringRemap[i] = j;
509 break;
510 }
511 }
512 if (j >= nbatoms) {
513 stringRemap[i] = nbatoms;
514 stringMap[nbatoms] = xmlStrdup(value);
515 if (stringMap[nbatoms] == NULL) {
516 for (i = 0;i < nbatoms;i++)
517 xmlFree(stringMap[i]);
518 xmlFree(stringRemap);
519 xmlFree(stringMap);
520 xmlFree(stateRemap);
521 xmlFree(ret);
522 return(NULL);
523 }
524 nbatoms++;
525 }
526 } else {
527 xmlFree(stateRemap);
528 xmlFree(stringRemap);
529 for (i = 0;i < nbatoms;i++)
530 xmlFree(stringMap[i]);
531 xmlFree(stringMap);
532 xmlFree(ret);
533 return(NULL);
534 }
535 }
536 #ifdef DEBUG_COMPACTION
537 printf("Final: %d atoms\n", nbatoms);
538 #endif
539 transitions = (int *) xmlMalloc((nbstates + 1) *
540 (nbatoms + 1) * sizeof(int));
541 if (transitions == NULL) {
542 xmlFree(stateRemap);
543 xmlFree(stringRemap);
544 xmlFree(stringMap);
545 xmlFree(ret);
546 return(NULL);
547 }
548 memset(transitions, 0, (nbstates + 1) * (nbatoms + 1) * sizeof(int));
549
550 /*
551 * Allocate the transition table. The first entry for each
552 * state corresponds to the state type.
553 */
554 transdata = NULL;
555
556 for (i = 0;i < ret->nbStates;i++) {
557 int stateno, atomno, targetno, prev;
558 xmlRegStatePtr state;
559 xmlRegTransPtr trans;
560
561 stateno = stateRemap[i];
562 if (stateno == -1)
563 continue;
564 state = ret->states[i];
565
566 transitions[stateno * (nbatoms + 1)] = state->type;
567
568 for (j = 0;j < state->nbTrans;j++) {
569 trans = &(state->trans[j]);
570 if ((trans->to == -1) || (trans->atom == NULL))
571 continue;
572 atomno = stringRemap[trans->atom->no];
573 if ((trans->atom->data != NULL) && (transdata == NULL)) {
574 transdata = (void **) xmlMalloc(nbstates * nbatoms *
575 sizeof(void *));
576 if (transdata != NULL)
577 memset(transdata, 0,
578 nbstates * nbatoms * sizeof(void *));
579 else {
580 xmlRegexpErrMemory(ctxt, "compiling regexp");
581 break;
582 }
583 }
584 targetno = stateRemap[trans->to];
585 /*
586 * if the same atom can generate transitions to 2 different
587 * states then it means the automata is not determinist and
588 * the compact form can't be used !
589 */
590 prev = transitions[stateno * (nbatoms + 1) + atomno + 1];
591 if (prev != 0) {
592 if (prev != targetno + 1) {
593 ret->determinist = 0;
594 #ifdef DEBUG_COMPACTION
595 printf("Indet: state %d trans %d, atom %d to %d : %d to %d\n",
596 i, j, trans->atom->no, trans->to, atomno, targetno);
597 printf(" previous to is %d\n", prev);
598 #endif
599 if (transdata != NULL)
600 xmlFree(transdata);
601 xmlFree(transitions);
602 xmlFree(stateRemap);
603 xmlFree(stringRemap);
604 for (i = 0;i < nbatoms;i++)
605 xmlFree(stringMap[i]);
606 xmlFree(stringMap);
607 goto not_determ;
608 }
609 } else {
610 #if 0
611 printf("State %d trans %d: atom %d to %d : %d to %d\n",
612 i, j, trans->atom->no, trans->to, atomno, targetno);
613 #endif
614 transitions[stateno * (nbatoms + 1) + atomno + 1] =
615 targetno + 1; /* to avoid 0 */
616 if (transdata != NULL)
617 transdata[stateno * nbatoms + atomno] =
618 trans->atom->data;
619 }
620 }
621 }
622 ret->determinist = 1;
623 #ifdef DEBUG_COMPACTION
624 /*
625 * Debug
626 */
627 for (i = 0;i < nbstates;i++) {
628 for (j = 0;j < nbatoms + 1;j++) {
629 printf("%02d ", transitions[i * (nbatoms + 1) + j]);
630 }
631 printf("\n");
632 }
633 printf("\n");
634 #endif
635 /*
636 * Cleanup of the old data
637 */
638 if (ret->states != NULL) {
639 for (i = 0;i < ret->nbStates;i++)
640 xmlRegFreeState(ret->states[i]);
641 xmlFree(ret->states);
642 }
643 ret->states = NULL;
644 ret->nbStates = 0;
645 if (ret->atoms != NULL) {
646 for (i = 0;i < ret->nbAtoms;i++)
647 xmlRegFreeAtom(ret->atoms[i]);
648 xmlFree(ret->atoms);
649 }
650 ret->atoms = NULL;
651 ret->nbAtoms = 0;
652
653 ret->compact = transitions;
654 ret->transdata = transdata;
655 ret->stringMap = stringMap;
656 ret->nbstrings = nbatoms;
657 ret->nbstates = nbstates;
658 xmlFree(stateRemap);
659 xmlFree(stringRemap);
660 }
661 not_determ:
662 ctxt->string = NULL;
663 ctxt->nbStates = 0;
664 ctxt->states = NULL;
665 ctxt->nbAtoms = 0;
666 ctxt->atoms = NULL;
667 ctxt->nbCounters = 0;
668 ctxt->counters = NULL;
669 return(ret);
670 }
671
672 /**
673 * xmlRegNewParserCtxt:
674 * @string: the string to parse
675 *
676 * Allocate a new regexp parser context
677 *
678 * Returns the new context or NULL in case of error
679 */
680 static xmlRegParserCtxtPtr
681 xmlRegNewParserCtxt(const xmlChar *string) {
682 xmlRegParserCtxtPtr ret;
683
684 ret = (xmlRegParserCtxtPtr) xmlMalloc(sizeof(xmlRegParserCtxt));
685 if (ret == NULL)
686 return(NULL);
687 memset(ret, 0, sizeof(xmlRegParserCtxt));
688 if (string != NULL)
689 ret->string = xmlStrdup(string);
690 ret->cur = ret->string;
691 ret->neg = 0;
692 ret->negs = 0;
693 ret->error = 0;
694 ret->determinist = -1;
695 return(ret);
696 }
697
698 /**
699 * xmlRegNewRange:
700 * @ctxt: the regexp parser context
701 * @neg: is that negative
702 * @type: the type of range
703 * @start: the start codepoint
704 * @end: the end codepoint
705 *
706 * Allocate a new regexp range
707 *
708 * Returns the new range or NULL in case of error
709 */
710 static xmlRegRangePtr
711 xmlRegNewRange(xmlRegParserCtxtPtr ctxt,
712 int neg, xmlRegAtomType type, int start, int end) {
713 xmlRegRangePtr ret;
714
715 ret = (xmlRegRangePtr) xmlMalloc(sizeof(xmlRegRange));
716 if (ret == NULL) {
717 xmlRegexpErrMemory(ctxt, "allocating range");
718 return(NULL);
719 }
720 ret->neg = neg;
721 ret->type = type;
722 ret->start = start;
723 ret->end = end;
724 return(ret);
725 }
726
727 /**
728 * xmlRegFreeRange:
729 * @range: the regexp range
730 *
731 * Free a regexp range
732 */
733 static void
734 xmlRegFreeRange(xmlRegRangePtr range) {
735 if (range == NULL)
736 return;
737
738 if (range->blockName != NULL)
739 xmlFree(range->blockName);
740 xmlFree(range);
741 }
742
743 /**
744 * xmlRegCopyRange:
745 * @range: the regexp range
746 *
747 * Copy a regexp range
748 *
749 * Returns the new copy or NULL in case of error.
750 */
751 static xmlRegRangePtr
752 xmlRegCopyRange(xmlRegParserCtxtPtr ctxt, xmlRegRangePtr range) {
753 xmlRegRangePtr ret;
754
755 if (range == NULL)
756 return(NULL);
757
758 ret = xmlRegNewRange(ctxt, range->neg, range->type, range->start,
759 range->end);
760 if (ret == NULL)
761 return(NULL);
762 if (range->blockName != NULL) {
763 ret->blockName = xmlStrdup(range->blockName);
764 if (ret->blockName == NULL) {
765 xmlRegexpErrMemory(ctxt, "allocating range");
766 xmlRegFreeRange(ret);
767 return(NULL);
768 }
769 }
770 return(ret);
771 }
772
773 /**
774 * xmlRegNewAtom:
775 * @ctxt: the regexp parser context
776 * @type: the type of atom
777 *
778 * Allocate a new atom
779 *
780 * Returns the new atom or NULL in case of error
781 */
782 static xmlRegAtomPtr
783 xmlRegNewAtom(xmlRegParserCtxtPtr ctxt, xmlRegAtomType type) {
784 xmlRegAtomPtr ret;
785
786 ret = (xmlRegAtomPtr) xmlMalloc(sizeof(xmlRegAtom));
787 if (ret == NULL) {
788 xmlRegexpErrMemory(ctxt, "allocating atom");
789 return(NULL);
790 }
791 memset(ret, 0, sizeof(xmlRegAtom));
792 ret->type = type;
793 ret->quant = XML_REGEXP_QUANT_ONCE;
794 ret->min = 0;
795 ret->max = 0;
796 return(ret);
797 }
798
799 /**
800 * xmlRegFreeAtom:
801 * @atom: the regexp atom
802 *
803 * Free a regexp atom
804 */
805 static void
806 xmlRegFreeAtom(xmlRegAtomPtr atom) {
807 int i;
808
809 if (atom == NULL)
810 return;
811
812 for (i = 0;i < atom->nbRanges;i++)
813 xmlRegFreeRange(atom->ranges[i]);
814 if (atom->ranges != NULL)
815 xmlFree(atom->ranges);
816 if ((atom->type == XML_REGEXP_STRING) && (atom->valuep != NULL))
817 xmlFree(atom->valuep);
818 if ((atom->type == XML_REGEXP_STRING) && (atom->valuep2 != NULL))
819 xmlFree(atom->valuep2);
820 if ((atom->type == XML_REGEXP_BLOCK_NAME) && (atom->valuep != NULL))
821 xmlFree(atom->valuep);
822 xmlFree(atom);
823 }
824
825 /**
826 * xmlRegCopyAtom:
827 * @ctxt: the regexp parser context
828 * @atom: the oiginal atom
829 *
830 * Allocate a new regexp range
831 *
832 * Returns the new atom or NULL in case of error
833 */
834 static xmlRegAtomPtr
835 xmlRegCopyAtom(xmlRegParserCtxtPtr ctxt, xmlRegAtomPtr atom) {
836 xmlRegAtomPtr ret;
837
838 ret = (xmlRegAtomPtr) xmlMalloc(sizeof(xmlRegAtom));
839 if (ret == NULL) {
840 xmlRegexpErrMemory(ctxt, "copying atom");
841 return(NULL);
842 }
843 memset(ret, 0, sizeof(xmlRegAtom));
844 ret->type = atom->type;
845 ret->quant = atom->quant;
846 ret->min = atom->min;
847 ret->max = atom->max;
848 if (atom->nbRanges > 0) {
849 int i;
850
851 ret->ranges = (xmlRegRangePtr *) xmlMalloc(sizeof(xmlRegRangePtr) *
852 atom->nbRanges);
853 if (ret->ranges == NULL) {
854 xmlRegexpErrMemory(ctxt, "copying atom");
855 goto error;
856 }
857 for (i = 0;i < atom->nbRanges;i++) {
858 ret->ranges[i] = xmlRegCopyRange(ctxt, atom->ranges[i]);
859 if (ret->ranges[i] == NULL)
860 goto error;
861 ret->nbRanges = i + 1;
862 }
863 }
864 return(ret);
865
866 error:
867 xmlRegFreeAtom(ret);
868 return(NULL);
869 }
870
871 static xmlRegStatePtr
872 xmlRegNewState(xmlRegParserCtxtPtr ctxt) {
873 xmlRegStatePtr ret;
874
875 ret = (xmlRegStatePtr) xmlMalloc(sizeof(xmlRegState));
876 if (ret == NULL) {
877 xmlRegexpErrMemory(ctxt, "allocating state");
878 return(NULL);
879 }
880 memset(ret, 0, sizeof(xmlRegState));
881 ret->type = XML_REGEXP_TRANS_STATE;
882 ret->mark = XML_REGEXP_MARK_NORMAL;
883 return(ret);
884 }
885
886 /**
887 * xmlRegFreeState:
888 * @state: the regexp state
889 *
890 * Free a regexp state
891 */
892 static void
893 xmlRegFreeState(xmlRegStatePtr state) {
894 if (state == NULL)
895 return;
896
897 if (state->trans != NULL)
898 xmlFree(state->trans);
899 if (state->transTo != NULL)
900 xmlFree(state->transTo);
901 xmlFree(state);
902 }
903
904 /**
905 * xmlRegFreeParserCtxt:
906 * @ctxt: the regexp parser context
907 *
908 * Free a regexp parser context
909 */
910 static void
911 xmlRegFreeParserCtxt(xmlRegParserCtxtPtr ctxt) {
912 int i;
913 if (ctxt == NULL)
914 return;
915
916 if (ctxt->string != NULL)
917 xmlFree(ctxt->string);
918 if (ctxt->states != NULL) {
919 for (i = 0;i < ctxt->nbStates;i++)
920 xmlRegFreeState(ctxt->states[i]);
921 xmlFree(ctxt->states);
922 }
923 if (ctxt->atoms != NULL) {
924 for (i = 0;i < ctxt->nbAtoms;i++)
925 xmlRegFreeAtom(ctxt->atoms[i]);
926 xmlFree(ctxt->atoms);
927 }
928 if (ctxt->counters != NULL)
929 xmlFree(ctxt->counters);
930 xmlFree(ctxt);
931 }
932
933 /************************************************************************
934 * *
935 * Display of Data structures *
936 * *
937 ************************************************************************/
938
939 static void
940 xmlRegPrintAtomType(FILE *output, xmlRegAtomType type) {
941 switch (type) {
942 case XML_REGEXP_EPSILON:
943 fprintf(output, "epsilon "); break;
944 case XML_REGEXP_CHARVAL:
945 fprintf(output, "charval "); break;
946 case XML_REGEXP_RANGES:
947 fprintf(output, "ranges "); break;
948 case XML_REGEXP_SUBREG:
949 fprintf(output, "subexpr "); break;
950 case XML_REGEXP_STRING:
951 fprintf(output, "string "); break;
952 case XML_REGEXP_ANYCHAR:
953 fprintf(output, "anychar "); break;
954 case XML_REGEXP_ANYSPACE:
955 fprintf(output, "anyspace "); break;
956 case XML_REGEXP_NOTSPACE:
957 fprintf(output, "notspace "); break;
958 case XML_REGEXP_INITNAME:
959 fprintf(output, "initname "); break;
960 case XML_REGEXP_NOTINITNAME:
961 fprintf(output, "notinitname "); break;
962 case XML_REGEXP_NAMECHAR:
963 fprintf(output, "namechar "); break;
964 case XML_REGEXP_NOTNAMECHAR:
965 fprintf(output, "notnamechar "); break;
966 case XML_REGEXP_DECIMAL:
967 fprintf(output, "decimal "); break;
968 case XML_REGEXP_NOTDECIMAL:
969 fprintf(output, "notdecimal "); break;
970 case XML_REGEXP_REALCHAR:
971 fprintf(output, "realchar "); break;
972 case XML_REGEXP_NOTREALCHAR:
973 fprintf(output, "notrealchar "); break;
974 case XML_REGEXP_LETTER:
975 fprintf(output, "LETTER "); break;
976 case XML_REGEXP_LETTER_UPPERCASE:
977 fprintf(output, "LETTER_UPPERCASE "); break;
978 case XML_REGEXP_LETTER_LOWERCASE:
979 fprintf(output, "LETTER_LOWERCASE "); break;
980 case XML_REGEXP_LETTER_TITLECASE:
981 fprintf(output, "LETTER_TITLECASE "); break;
982 case XML_REGEXP_LETTER_MODIFIER:
983 fprintf(output, "LETTER_MODIFIER "); break;
984 case XML_REGEXP_LETTER_OTHERS:
985 fprintf(output, "LETTER_OTHERS "); break;
986 case XML_REGEXP_MARK:
987 fprintf(output, "MARK "); break;
988 case XML_REGEXP_MARK_NONSPACING:
989 fprintf(output, "MARK_NONSPACING "); break;
990 case XML_REGEXP_MARK_SPACECOMBINING:
991 fprintf(output, "MARK_SPACECOMBINING "); break;
992 case XML_REGEXP_MARK_ENCLOSING:
993 fprintf(output, "MARK_ENCLOSING "); break;
994 case XML_REGEXP_NUMBER:
995 fprintf(output, "NUMBER "); break;
996 case XML_REGEXP_NUMBER_DECIMAL:
997 fprintf(output, "NUMBER_DECIMAL "); break;
998 case XML_REGEXP_NUMBER_LETTER:
999 fprintf(output, "NUMBER_LETTER "); break;
1000 case XML_REGEXP_NUMBER_OTHERS:
1001 fprintf(output, "NUMBER_OTHERS "); break;
1002 case XML_REGEXP_PUNCT:
1003 fprintf(output, "PUNCT "); break;
1004 case XML_REGEXP_PUNCT_CONNECTOR:
1005 fprintf(output, "PUNCT_CONNECTOR "); break;
1006 case XML_REGEXP_PUNCT_DASH:
1007 fprintf(output, "PUNCT_DASH "); break;
1008 case XML_REGEXP_PUNCT_OPEN:
1009 fprintf(output, "PUNCT_OPEN "); break;
1010 case XML_REGEXP_PUNCT_CLOSE:
1011 fprintf(output, "PUNCT_CLOSE "); break;
1012 case XML_REGEXP_PUNCT_INITQUOTE:
1013 fprintf(output, "PUNCT_INITQUOTE "); break;
1014 case XML_REGEXP_PUNCT_FINQUOTE:
1015 fprintf(output, "PUNCT_FINQUOTE "); break;
1016 case XML_REGEXP_PUNCT_OTHERS:
1017 fprintf(output, "PUNCT_OTHERS "); break;
1018 case XML_REGEXP_SEPAR:
1019 fprintf(output, "SEPAR "); break;
1020 case XML_REGEXP_SEPAR_SPACE:
1021 fprintf(output, "SEPAR_SPACE "); break;
1022 case XML_REGEXP_SEPAR_LINE:
1023 fprintf(output, "SEPAR_LINE "); break;
1024 case XML_REGEXP_SEPAR_PARA:
1025 fprintf(output, "SEPAR_PARA "); break;
1026 case XML_REGEXP_SYMBOL:
1027 fprintf(output, "SYMBOL "); break;
1028 case XML_REGEXP_SYMBOL_MATH:
1029 fprintf(output, "SYMBOL_MATH "); break;
1030 case XML_REGEXP_SYMBOL_CURRENCY:
1031 fprintf(output, "SYMBOL_CURRENCY "); break;
1032 case XML_REGEXP_SYMBOL_MODIFIER:
1033 fprintf(output, "SYMBOL_MODIFIER "); break;
1034 case XML_REGEXP_SYMBOL_OTHERS:
1035 fprintf(output, "SYMBOL_OTHERS "); break;
1036 case XML_REGEXP_OTHER:
1037 fprintf(output, "OTHER "); break;
1038 case XML_REGEXP_OTHER_CONTROL:
1039 fprintf(output, "OTHER_CONTROL "); break;
1040 case XML_REGEXP_OTHER_FORMAT:
1041 fprintf(output, "OTHER_FORMAT "); break;
1042 case XML_REGEXP_OTHER_PRIVATE:
1043 fprintf(output, "OTHER_PRIVATE "); break;
1044 case XML_REGEXP_OTHER_NA:
1045 fprintf(output, "OTHER_NA "); break;
1046 case XML_REGEXP_BLOCK_NAME:
1047 fprintf(output, "BLOCK "); break;
1048 }
1049 }
1050
1051 static void
1052 xmlRegPrintQuantType(FILE *output, xmlRegQuantType type) {
1053 switch (type) {
1054 case XML_REGEXP_QUANT_EPSILON:
1055 fprintf(output, "epsilon "); break;
1056 case XML_REGEXP_QUANT_ONCE:
1057 fprintf(output, "once "); break;
1058 case XML_REGEXP_QUANT_OPT:
1059 fprintf(output, "? "); break;
1060 case XML_REGEXP_QUANT_MULT:
1061 fprintf(output, "* "); break;
1062 case XML_REGEXP_QUANT_PLUS:
1063 fprintf(output, "+ "); break;
1064 case XML_REGEXP_QUANT_RANGE:
1065 fprintf(output, "range "); break;
1066 case XML_REGEXP_QUANT_ONCEONLY:
1067 fprintf(output, "onceonly "); break;
1068 case XML_REGEXP_QUANT_ALL:
1069 fprintf(output, "all "); break;
1070 }
1071 }
1072 static void
1073 xmlRegPrintRange(FILE *output, xmlRegRangePtr range) {
1074 fprintf(output, " range: ");
1075 if (range->neg)
1076 fprintf(output, "negative ");
1077 xmlRegPrintAtomType(output, range->type);
1078 fprintf(output, "%c - %c\n", range->start, range->end);
1079 }
1080
1081 static void
1082 xmlRegPrintAtom(FILE *output, xmlRegAtomPtr atom) {
1083 fprintf(output, " atom: ");
1084 if (atom == NULL) {
1085 fprintf(output, "NULL\n");
1086 return;
1087 }
1088 if (atom->neg)
1089 fprintf(output, "not ");
1090 xmlRegPrintAtomType(output, atom->type);
1091 xmlRegPrintQuantType(output, atom->quant);
1092 if (atom->quant == XML_REGEXP_QUANT_RANGE)
1093 fprintf(output, "%d-%d ", atom->min, atom->max);
1094 if (atom->type == XML_REGEXP_STRING)
1095 fprintf(output, "'%s' ", (char *) atom->valuep);
1096 if (atom->type == XML_REGEXP_CHARVAL)
1097 fprintf(output, "char %c\n", atom->codepoint);
1098 else if (atom->type == XML_REGEXP_RANGES) {
1099 int i;
1100 fprintf(output, "%d entries\n", atom->nbRanges);
1101 for (i = 0; i < atom->nbRanges;i++)
1102 xmlRegPrintRange(output, atom->ranges[i]);
1103 } else if (atom->type == XML_REGEXP_SUBREG) {
1104 fprintf(output, "start %d end %d\n", atom->start->no, atom->stop->no);
1105 } else {
1106 fprintf(output, "\n");
1107 }
1108 }
1109
1110 static void
1111 xmlRegPrintTrans(FILE *output, xmlRegTransPtr trans) {
1112 fprintf(output, " trans: ");
1113 if (trans == NULL) {
1114 fprintf(output, "NULL\n");
1115 return;
1116 }
1117 if (trans->to < 0) {
1118 fprintf(output, "removed\n");
1119 return;
1120 }
1121 if (trans->nd != 0) {
1122 if (trans->nd == 2)
1123 fprintf(output, "last not determinist, ");
1124 else
1125 fprintf(output, "not determinist, ");
1126 }
1127 if (trans->counter >= 0) {
1128 fprintf(output, "counted %d, ", trans->counter);
1129 }
1130 if (trans->count == REGEXP_ALL_COUNTER) {
1131 fprintf(output, "all transition, ");
1132 } else if (trans->count >= 0) {
1133 fprintf(output, "count based %d, ", trans->count);
1134 }
1135 if (trans->atom == NULL) {
1136 fprintf(output, "epsilon to %d\n", trans->to);
1137 return;
1138 }
1139 if (trans->atom->type == XML_REGEXP_CHARVAL)
1140 fprintf(output, "char %c ", trans->atom->codepoint);
1141 fprintf(output, "atom %d, to %d\n", trans->atom->no, trans->to);
1142 }
1143
1144 static void
1145 xmlRegPrintState(FILE *output, xmlRegStatePtr state) {
1146 int i;
1147
1148 fprintf(output, " state: ");
1149 if (state == NULL) {
1150 fprintf(output, "NULL\n");
1151 return;
1152 }
1153 if (state->type == XML_REGEXP_START_STATE)
1154 fprintf(output, "START ");
1155 if (state->type == XML_REGEXP_FINAL_STATE)
1156 fprintf(output, "FINAL ");
1157
1158 fprintf(output, "%d, %d transitions:\n", state->no, state->nbTrans);
1159 for (i = 0;i < state->nbTrans; i++) {
1160 xmlRegPrintTrans(output, &(state->trans[i]));
1161 }
1162 }
1163
1164 #ifdef DEBUG_REGEXP_GRAPH
1165 static void
1166 xmlRegPrintCtxt(FILE *output, xmlRegParserCtxtPtr ctxt) {
1167 int i;
1168
1169 fprintf(output, " ctxt: ");
1170 if (ctxt == NULL) {
1171 fprintf(output, "NULL\n");
1172 return;
1173 }
1174 fprintf(output, "'%s' ", ctxt->string);
1175 if (ctxt->error)
1176 fprintf(output, "error ");
1177 if (ctxt->neg)
1178 fprintf(output, "neg ");
1179 fprintf(output, "\n");
1180 fprintf(output, "%d atoms:\n", ctxt->nbAtoms);
1181 for (i = 0;i < ctxt->nbAtoms; i++) {
1182 fprintf(output, " %02d ", i);
1183 xmlRegPrintAtom(output, ctxt->atoms[i]);
1184 }
1185 if (ctxt->atom != NULL) {
1186 fprintf(output, "current atom:\n");
1187 xmlRegPrintAtom(output, ctxt->atom);
1188 }
1189 fprintf(output, "%d states:", ctxt->nbStates);
1190 if (ctxt->start != NULL)
1191 fprintf(output, " start: %d", ctxt->start->no);
1192 if (ctxt->end != NULL)
1193 fprintf(output, " end: %d", ctxt->end->no);
1194 fprintf(output, "\n");
1195 for (i = 0;i < ctxt->nbStates; i++) {
1196 xmlRegPrintState(output, ctxt->states[i]);
1197 }
1198 fprintf(output, "%d counters:\n", ctxt->nbCounters);
1199 for (i = 0;i < ctxt->nbCounters; i++) {
1200 fprintf(output, " %d: min %d max %d\n", i, ctxt->counters[i].min,
1201 ctxt->counters[i].max);
1202 }
1203 }
1204 #endif
1205
1206 /************************************************************************
1207 * *
1208 * Finite Automata structures manipulations *
1209 * *
1210 ************************************************************************/
1211
1212 static void
1213 xmlRegAtomAddRange(xmlRegParserCtxtPtr ctxt, xmlRegAtomPtr atom,
1214 int neg, xmlRegAtomType type, int start, int end,
1215 xmlChar *blockName) {
1216 xmlRegRangePtr range;
1217
1218 if (atom == NULL) {
1219 ERROR("add range: atom is NULL");
1220 return;
1221 }
1222 if (atom->type != XML_REGEXP_RANGES) {
1223 ERROR("add range: atom is not ranges");
1224 return;
1225 }
1226 if (atom->maxRanges == 0) {
1227 atom->maxRanges = 4;
1228 atom->ranges = (xmlRegRangePtr *) xmlMalloc(atom->maxRanges *
1229 sizeof(xmlRegRangePtr));
1230 if (atom->ranges == NULL) {
1231 xmlRegexpErrMemory(ctxt, "adding ranges");
1232 atom->maxRanges = 0;
1233 return;
1234 }
1235 } else if (atom->nbRanges >= atom->maxRanges) {
1236 xmlRegRangePtr *tmp;
1237 atom->maxRanges *= 2;
1238 tmp = (xmlRegRangePtr *) xmlRealloc(atom->ranges, atom->maxRanges *
1239 sizeof(xmlRegRangePtr));
1240 if (tmp == NULL) {
1241 xmlRegexpErrMemory(ctxt, "adding ranges");
1242 atom->maxRanges /= 2;
1243 return;
1244 }
1245 atom->ranges = tmp;
1246 }
1247 range = xmlRegNewRange(ctxt, neg, type, start, end);
1248 if (range == NULL)
1249 return;
1250 range->blockName = blockName;
1251 atom->ranges[atom->nbRanges++] = range;
1252
1253 }
1254
1255 static int
1256 xmlRegGetCounter(xmlRegParserCtxtPtr ctxt) {
1257 if (ctxt->maxCounters == 0) {
1258 ctxt->maxCounters = 4;
1259 ctxt->counters = (xmlRegCounter *) xmlMalloc(ctxt->maxCounters *
1260 sizeof(xmlRegCounter));
1261 if (ctxt->counters == NULL) {
1262 xmlRegexpErrMemory(ctxt, "allocating counter");
1263 ctxt->maxCounters = 0;
1264 return(-1);
1265 }
1266 } else if (ctxt->nbCounters >= ctxt->maxCounters) {
1267 xmlRegCounter *tmp;
1268 ctxt->maxCounters *= 2;
1269 tmp = (xmlRegCounter *) xmlRealloc(ctxt->counters, ctxt->maxCounters *
1270 sizeof(xmlRegCounter));
1271 if (tmp == NULL) {
1272 xmlRegexpErrMemory(ctxt, "allocating counter");
1273 ctxt->maxCounters /= 2;
1274 return(-1);
1275 }
1276 ctxt->counters = tmp;
1277 }
1278 ctxt->counters[ctxt->nbCounters].min = -1;
1279 ctxt->counters[ctxt->nbCounters].max = -1;
1280 return(ctxt->nbCounters++);
1281 }
1282
1283 static int
1284 xmlRegAtomPush(xmlRegParserCtxtPtr ctxt, xmlRegAtomPtr atom) {
1285 if (atom == NULL) {
1286 ERROR("atom push: atom is NULL");
1287 return(-1);
1288 }
1289 if (ctxt->maxAtoms == 0) {
1290 ctxt->maxAtoms = 4;
1291 ctxt->atoms = (xmlRegAtomPtr *) xmlMalloc(ctxt->maxAtoms *
1292 sizeof(xmlRegAtomPtr));
1293 if (ctxt->atoms == NULL) {
1294 xmlRegexpErrMemory(ctxt, "pushing atom");
1295 ctxt->maxAtoms = 0;
1296 return(-1);
1297 }
1298 } else if (ctxt->nbAtoms >= ctxt->maxAtoms) {
1299 xmlRegAtomPtr *tmp;
1300 ctxt->maxAtoms *= 2;
1301 tmp = (xmlRegAtomPtr *) xmlRealloc(ctxt->atoms, ctxt->maxAtoms *
1302 sizeof(xmlRegAtomPtr));
1303 if (tmp == NULL) {
1304 xmlRegexpErrMemory(ctxt, "allocating counter");
1305 ctxt->maxAtoms /= 2;
1306 return(-1);
1307 }
1308 ctxt->atoms = tmp;
1309 }
1310 atom->no = ctxt->nbAtoms;
1311 ctxt->atoms[ctxt->nbAtoms++] = atom;
1312 return(0);
1313 }
1314
1315 static void
1316 xmlRegStateAddTransTo(xmlRegParserCtxtPtr ctxt, xmlRegStatePtr target,
1317 int from) {
1318 if (target->maxTransTo == 0) {
1319 target->maxTransTo = 8;
1320 target->transTo = (int *) xmlMalloc(target->maxTransTo *
1321 sizeof(int));
1322 if (target->transTo == NULL) {
1323 xmlRegexpErrMemory(ctxt, "adding transition");
1324 target->maxTransTo = 0;
1325 return;
1326 }
1327 } else if (target->nbTransTo >= target->maxTransTo) {
1328 int *tmp;
1329 target->maxTransTo *= 2;
1330 tmp = (int *) xmlRealloc(target->transTo, target->maxTransTo *
1331 sizeof(int));
1332 if (tmp == NULL) {
1333 xmlRegexpErrMemory(ctxt, "adding transition");
1334 target->maxTransTo /= 2;
1335 return;
1336 }
1337 target->transTo = tmp;
1338 }
1339 target->transTo[target->nbTransTo] = from;
1340 target->nbTransTo++;
1341 }
1342
1343 static void
1344 xmlRegStateAddTrans(xmlRegParserCtxtPtr ctxt, xmlRegStatePtr state,
1345 xmlRegAtomPtr atom, xmlRegStatePtr target,
1346 int counter, int count) {
1347
1348 int nrtrans;
1349
1350 if (state == NULL) {
1351 ERROR("add state: state is NULL");
1352 return;
1353 }
1354 if (target == NULL) {
1355 ERROR("add state: target is NULL");
1356 return;
1357 }
1358 /*
1359 * Other routines follow the philosophy 'When in doubt, add a transition'
1360 * so we check here whether such a transition is already present and, if
1361 * so, silently ignore this request.
1362 */
1363
1364 for (nrtrans = state->nbTrans - 1; nrtrans >= 0; nrtrans--) {
1365 xmlRegTransPtr trans = &(state->trans[nrtrans]);
1366 if ((trans->atom == atom) &&
1367 (trans->to == target->no) &&
1368 (trans->counter == counter) &&
1369 (trans->count == count)) {
1370 #ifdef DEBUG_REGEXP_GRAPH
1371 printf("Ignoring duplicate transition from %d to %d\n",
1372 state->no, target->no);
1373 #endif
1374 return;
1375 }
1376 }
1377
1378 if (state->maxTrans == 0) {
1379 state->maxTrans = 8;
1380 state->trans = (xmlRegTrans *) xmlMalloc(state->maxTrans *
1381 sizeof(xmlRegTrans));
1382 if (state->trans == NULL) {
1383 xmlRegexpErrMemory(ctxt, "adding transition");
1384 state->maxTrans = 0;
1385 return;
1386 }
1387 } else if (state->nbTrans >= state->maxTrans) {
1388 xmlRegTrans *tmp;
1389 state->maxTrans *= 2;
1390 tmp = (xmlRegTrans *) xmlRealloc(state->trans, state->maxTrans *
1391 sizeof(xmlRegTrans));
1392 if (tmp == NULL) {
1393 xmlRegexpErrMemory(ctxt, "adding transition");
1394 state->maxTrans /= 2;
1395 return;
1396 }
1397 state->trans = tmp;
1398 }
1399 #ifdef DEBUG_REGEXP_GRAPH
1400 printf("Add trans from %d to %d ", state->no, target->no);
1401 if (count == REGEXP_ALL_COUNTER)
1402 printf("all transition\n");
1403 else if (count >= 0)
1404 printf("count based %d\n", count);
1405 else if (counter >= 0)
1406 printf("counted %d\n", counter);
1407 else if (atom == NULL)
1408 printf("epsilon transition\n");
1409 else if (atom != NULL)
1410 xmlRegPrintAtom(stdout, atom);
1411 #endif
1412
1413 state->trans[state->nbTrans].atom = atom;
1414 state->trans[state->nbTrans].to = target->no;
1415 state->trans[state->nbTrans].counter = counter;
1416 state->trans[state->nbTrans].count = count;
1417 state->trans[state->nbTrans].nd = 0;
1418 state->nbTrans++;
1419 xmlRegStateAddTransTo(ctxt, target, state->no);
1420 }
1421
1422 static int
1423 xmlRegStatePush(xmlRegParserCtxtPtr ctxt, xmlRegStatePtr state) {
1424 if (state == NULL) return(-1);
1425 if (ctxt->maxStates == 0) {
1426 ctxt->maxStates = 4;
1427 ctxt->states = (xmlRegStatePtr *) xmlMalloc(ctxt->maxStates *
1428 sizeof(xmlRegStatePtr));
1429 if (ctxt->states == NULL) {
1430 xmlRegexpErrMemory(ctxt, "adding state");
1431 ctxt->maxStates = 0;
1432 return(-1);
1433 }
1434 } else if (ctxt->nbStates >= ctxt->maxStates) {
1435 xmlRegStatePtr *tmp;
1436 ctxt->maxStates *= 2;
1437 tmp = (xmlRegStatePtr *) xmlRealloc(ctxt->states, ctxt->maxStates *
1438 sizeof(xmlRegStatePtr));
1439 if (tmp == NULL) {
1440 xmlRegexpErrMemory(ctxt, "adding state");
1441 ctxt->maxStates /= 2;
1442 return(-1);
1443 }
1444 ctxt->states = tmp;
1445 }
1446 state->no = ctxt->nbStates;
1447 ctxt->states[ctxt->nbStates++] = state;
1448 return(0);
1449 }
1450
1451 /**
1452 * xmlFAGenerateAllTransition:
1453 * @ctxt: a regexp parser context
1454 * @from: the from state
1455 * @to: the target state or NULL for building a new one
1456 * @lax:
1457 *
1458 */
1459 static void
1460 xmlFAGenerateAllTransition(xmlRegParserCtxtPtr ctxt,
1461 xmlRegStatePtr from, xmlRegStatePtr to,
1462 int lax) {
1463 if (to == NULL) {
1464 to = xmlRegNewState(ctxt);
1465 xmlRegStatePush(ctxt, to);
1466 ctxt->state = to;
1467 }
1468 if (lax)
1469 xmlRegStateAddTrans(ctxt, from, NULL, to, -1, REGEXP_ALL_LAX_COUNTER);
1470 else
1471 xmlRegStateAddTrans(ctxt, from, NULL, to, -1, REGEXP_ALL_COUNTER);
1472 }
1473
1474 /**
1475 * xmlFAGenerateEpsilonTransition:
1476 * @ctxt: a regexp parser context
1477 * @from: the from state
1478 * @to: the target state or NULL for building a new one
1479 *
1480 */
1481 static void
1482 xmlFAGenerateEpsilonTransition(xmlRegParserCtxtPtr ctxt,
1483 xmlRegStatePtr from, xmlRegStatePtr to) {
1484 if (to == NULL) {
1485 to = xmlRegNewState(ctxt);
1486 xmlRegStatePush(ctxt, to);
1487 ctxt->state = to;
1488 }
1489 xmlRegStateAddTrans(ctxt, from, NULL, to, -1, -1);
1490 }
1491
1492 /**
1493 * xmlFAGenerateCountedEpsilonTransition:
1494 * @ctxt: a regexp parser context
1495 * @from: the from state
1496 * @to: the target state or NULL for building a new one
1497 * counter: the counter for that transition
1498 *
1499 */
1500 static void
1501 xmlFAGenerateCountedEpsilonTransition(xmlRegParserCtxtPtr ctxt,
1502 xmlRegStatePtr from, xmlRegStatePtr to, int counter) {
1503 if (to == NULL) {
1504 to = xmlRegNewState(ctxt);
1505 xmlRegStatePush(ctxt, to);
1506 ctxt->state = to;
1507 }
1508 xmlRegStateAddTrans(ctxt, from, NULL, to, counter, -1);
1509 }
1510
1511 /**
1512 * xmlFAGenerateCountedTransition:
1513 * @ctxt: a regexp parser context
1514 * @from: the from state
1515 * @to: the target state or NULL for building a new one
1516 * counter: the counter for that transition
1517 *
1518 */
1519 static void
1520 xmlFAGenerateCountedTransition(xmlRegParserCtxtPtr ctxt,
1521 xmlRegStatePtr from, xmlRegStatePtr to, int counter) {
1522 if (to == NULL) {
1523 to = xmlRegNewState(ctxt);
1524 xmlRegStatePush(ctxt, to);
1525 ctxt->state = to;
1526 }
1527 xmlRegStateAddTrans(ctxt, from, NULL, to, -1, counter);
1528 }
1529
1530 /**
1531 * xmlFAGenerateTransitions:
1532 * @ctxt: a regexp parser context
1533 * @from: the from state
1534 * @to: the target state or NULL for building a new one
1535 * @atom: the atom generating the transition
1536 *
1537 * Returns 0 if success and -1 in case of error.
1538 */
1539 static int
1540 xmlFAGenerateTransitions(xmlRegParserCtxtPtr ctxt, xmlRegStatePtr from,
1541 xmlRegStatePtr to, xmlRegAtomPtr atom) {
1542 xmlRegStatePtr end;
1543
1544 if (atom == NULL) {
1545 ERROR("genrate transition: atom == NULL");
1546 return(-1);
1547 }
1548 if (atom->type == XML_REGEXP_SUBREG) {
1549 /*
1550 * this is a subexpression handling one should not need to
1551 * create a new node except for XML_REGEXP_QUANT_RANGE.
1552 */
1553 if (xmlRegAtomPush(ctxt, atom) < 0) {
1554 return(-1);
1555 }
1556 if ((to != NULL) && (atom->stop != to) &&
1557 (atom->quant != XML_REGEXP_QUANT_RANGE)) {
1558 /*
1559 * Generate an epsilon transition to link to the target
1560 */
1561 xmlFAGenerateEpsilonTransition(ctxt, atom->stop, to);
1562 #ifdef DV
1563 } else if ((to == NULL) && (atom->quant != XML_REGEXP_QUANT_RANGE) &&
1564 (atom->quant != XML_REGEXP_QUANT_ONCE)) {
1565 to = xmlRegNewState(ctxt);
1566 xmlRegStatePush(ctxt, to);
1567 ctxt->state = to;
1568 xmlFAGenerateEpsilonTransition(ctxt, atom->stop, to);
1569 #endif
1570 }
1571 switch (atom->quant) {
1572 case XML_REGEXP_QUANT_OPT:
1573 atom->quant = XML_REGEXP_QUANT_ONCE;
1574 /*
1575 * transition done to the state after end of atom.
1576 * 1. set transition from atom start to new state
1577 * 2. set transition from atom end to this state.
1578 */
1579 if (to == NULL) {
1580 xmlFAGenerateEpsilonTransition(ctxt, atom->start, 0);
1581 xmlFAGenerateEpsilonTransition(ctxt, atom->stop,
1582 ctxt->state);
1583 } else {
1584 xmlFAGenerateEpsilonTransition(ctxt, atom->start, to);
1585 }
1586 break;
1587 case XML_REGEXP_QUANT_MULT:
1588 atom->quant = XML_REGEXP_QUANT_ONCE;
1589 xmlFAGenerateEpsilonTransition(ctxt, atom->start, atom->stop);
1590 xmlFAGenerateEpsilonTransition(ctxt, atom->stop, atom->start);
1591 break;
1592 case XML_REGEXP_QUANT_PLUS:
1593 atom->quant = XML_REGEXP_QUANT_ONCE;
1594 xmlFAGenerateEpsilonTransition(ctxt, atom->stop, atom->start);
1595 break;
1596 case XML_REGEXP_QUANT_RANGE: {
1597 int counter;
1598 xmlRegStatePtr inter, newstate;
1599
1600 /*
1601 * create the final state now if needed
1602 */
1603 if (to != NULL) {
1604 newstate = to;
1605 } else {
1606 newstate = xmlRegNewState(ctxt);
1607 xmlRegStatePush(ctxt, newstate);
1608 }
1609
1610 /*
1611 * The principle here is to use counted transition
1612 * to avoid explosion in the number of states in the
1613 * graph. This is clearly more complex but should not
1614 * be exploitable at runtime.
1615 */
1616 if ((atom->min == 0) && (atom->start0 == NULL)) {
1617 xmlRegAtomPtr copy;
1618 /*
1619 * duplicate a transition based on atom to count next
1620 * occurences after 1. We cannot loop to atom->start
1621 * directly because we need an epsilon transition to
1622 * newstate.
1623 */
1624 /* ???? For some reason it seems we never reach that
1625 case, I suppose this got optimized out before when
1626 building the automata */
1627 copy = xmlRegCopyAtom(ctxt, atom);
1628 if (copy == NULL)
1629 return(-1);
1630 copy->quant = XML_REGEXP_QUANT_ONCE;
1631 copy->min = 0;
1632 copy->max = 0;
1633
1634 if (xmlFAGenerateTransitions(ctxt, atom->start, NULL, copy)
1635 < 0)
1636 return(-1);
1637 inter = ctxt->state;
1638 counter = xmlRegGetCounter(ctxt);
1639 ctxt->counters[counter].min = atom->min - 1;
1640 ctxt->counters[counter].max = atom->max - 1;
1641 /* count the number of times we see it again */
1642 xmlFAGenerateCountedEpsilonTransition(ctxt, inter,
1643 atom->stop, counter);
1644 /* allow a way out based on the count */
1645 xmlFAGenerateCountedTransition(ctxt, inter,
1646 newstate, counter);
1647 /* and also allow a direct exit for 0 */
1648 xmlFAGenerateEpsilonTransition(ctxt, atom->start,
1649 newstate);
1650 } else {
1651 /*
1652 * either we need the atom at least once or there
1653 * is an atom->start0 allowing to easilly plug the
1654 * epsilon transition.
1655 */
1656 counter = xmlRegGetCounter(ctxt);
1657 ctxt->counters[counter].min = atom->min - 1;
1658 ctxt->counters[counter].max = atom->max - 1;
1659 /* count the number of times we see it again */
1660 xmlFAGenerateCountedEpsilonTransition(ctxt, atom->stop,
1661 atom->start, counter);
1662 /* allow a way out based on the count */
1663 xmlFAGenerateCountedTransition(ctxt, atom->stop,
1664 newstate, counter);
1665 /* and if needed allow a direct exit for 0 */
1666 if (atom->min == 0)
1667 xmlFAGenerateEpsilonTransition(ctxt, atom->start0,
1668 newstate);
1669
1670 }
1671 atom->min = 0;
1672 atom->max = 0;
1673 atom->quant = XML_REGEXP_QUANT_ONCE;
1674 ctxt->state = newstate;
1675 }
1676 default:
1677 break;
1678 }
1679 return(0);
1680 }
1681 if ((atom->min == 0) && (atom->max == 0) &&
1682 (atom->quant == XML_REGEXP_QUANT_RANGE)) {
1683 /*
1684 * we can discard the atom and generate an epsilon transition instead
1685 */
1686 if (to == NULL) {
1687 to = xmlRegNewState(ctxt);
1688 if (to != NULL)
1689 xmlRegStatePush(ctxt, to);
1690 else {
1691 return(-1);
1692 }
1693 }
1694 xmlFAGenerateEpsilonTransition(ctxt, from, to);
1695 ctxt->state = to;
1696 xmlRegFreeAtom(atom);
1697 return(0);
1698 }
1699 if (to == NULL) {
1700 to = xmlRegNewState(ctxt);
1701 if (to != NULL)
1702 xmlRegStatePush(ctxt, to);
1703 else {
1704 return(-1);
1705 }
1706 }
1707 end = to;
1708 if ((atom->quant == XML_REGEXP_QUANT_MULT) ||
1709 (atom->quant == XML_REGEXP_QUANT_PLUS)) {
1710 /*
1711 * Do not pollute the target state by adding transitions from
1712 * it as it is likely to be the shared target of multiple branches.
1713 * So isolate with an epsilon transition.
1714 */
1715 xmlRegStatePtr tmp;
1716
1717 tmp = xmlRegNewState(ctxt);
1718 if (tmp != NULL)
1719 xmlRegStatePush(ctxt, tmp);
1720 else {
1721 return(-1);
1722 }
1723 xmlFAGenerateEpsilonTransition(ctxt, tmp, to);
1724 to = tmp;
1725 }
1726 if (xmlRegAtomPush(ctxt, atom) < 0) {
1727 return(-1);
1728 }
1729 xmlRegStateAddTrans(ctxt, from, atom, to, -1, -1);
1730 ctxt->state = end;
1731 switch (atom->quant) {
1732 case XML_REGEXP_QUANT_OPT:
1733 atom->quant = XML_REGEXP_QUANT_ONCE;
1734 xmlFAGenerateEpsilonTransition(ctxt, from, to);
1735 break;
1736 case XML_REGEXP_QUANT_MULT:
1737 atom->quant = XML_REGEXP_QUANT_ONCE;
1738 xmlFAGenerateEpsilonTransition(ctxt, from, to);
1739 xmlRegStateAddTrans(ctxt, to, atom, to, -1, -1);
1740 break;
1741 case XML_REGEXP_QUANT_PLUS:
1742 atom->quant = XML_REGEXP_QUANT_ONCE;
1743 xmlRegStateAddTrans(ctxt, to, atom, to, -1, -1);
1744 break;
1745 case XML_REGEXP_QUANT_RANGE:
1746 #if DV_test
1747 if (atom->min == 0) {
1748 xmlFAGenerateEpsilonTransition(ctxt, from, to);
1749 }
1750 #endif
1751 break;
1752 default:
1753 break;
1754 }
1755 return(0);
1756 }
1757
1758 /**
1759 * xmlFAReduceEpsilonTransitions:
1760 * @ctxt: a regexp parser context
1761 * @fromnr: the from state
1762 * @tonr: the to state
1763 * @counter: should that transition be associated to a counted
1764 *
1765 */
1766 static void
1767 xmlFAReduceEpsilonTransitions(xmlRegParserCtxtPtr ctxt, int fromnr,
1768 int tonr, int counter) {
1769 int transnr;
1770 xmlRegStatePtr from;
1771 xmlRegStatePtr to;
1772
1773 #ifdef DEBUG_REGEXP_GRAPH
1774 printf("xmlFAReduceEpsilonTransitions(%d, %d)\n", fromnr, tonr);
1775 #endif
1776 from = ctxt->states[fromnr];
1777 if (from == NULL)
1778 return;
1779 to = ctxt->states[tonr];
1780 if (to == NULL)
1781 return;
1782 if ((to->mark == XML_REGEXP_MARK_START) ||
1783 (to->mark == XML_REGEXP_MARK_VISITED))
1784 return;
1785
1786 to->mark = XML_REGEXP_MARK_VISITED;
1787 if (to->type == XML_REGEXP_FINAL_STATE) {
1788 #ifdef DEBUG_REGEXP_GRAPH
1789 printf("State %d is final, so %d becomes final\n", tonr, fromnr);
1790 #endif
1791 from->type = XML_REGEXP_FINAL_STATE;
1792 }
1793 for (transnr = 0;transnr < to->nbTrans;transnr++) {
1794 if (to->trans[transnr].to < 0)
1795 continue;
1796 if (to->trans[transnr].atom == NULL) {
1797 /*
1798 * Don't remove counted transitions
1799 * Don't loop either
1800 */
1801 if (to->trans[transnr].to != fromnr) {
1802 if (to->trans[transnr].count >= 0) {
1803 int newto = to->trans[transnr].to;
1804
1805 xmlRegStateAddTrans(ctxt, from, NULL,
1806 ctxt->states[newto],
1807 -1, to->trans[transnr].count);
1808 } else {
1809 #ifdef DEBUG_REGEXP_GRAPH
1810 printf("Found epsilon trans %d from %d to %d\n",
1811 transnr, tonr, to->trans[transnr].to);
1812 #endif
1813 if (to->trans[transnr].counter >= 0) {
1814 xmlFAReduceEpsilonTransitions(ctxt, fromnr,
1815 to->trans[transnr].to,
1816 to->trans[transnr].counter);
1817 } else {
1818 xmlFAReduceEpsilonTransitions(ctxt, fromnr,
1819 to->trans[transnr].to,
1820 counter);
1821 }
1822 }
1823 }
1824 } else {
1825 int newto = to->trans[transnr].to;
1826
1827 if (to->trans[transnr].counter >= 0) {
1828 xmlRegStateAddTrans(ctxt, from, to->trans[transnr].atom,
1829 ctxt->states[newto],
1830 to->trans[transnr].counter, -1);
1831 } else {
1832 xmlRegStateAddTrans(ctxt, from, to->trans[transnr].atom,
1833 ctxt->states[newto], counter, -1);
1834 }
1835 }
1836 }
1837 to->mark = XML_REGEXP_MARK_NORMAL;
1838 }
1839
1840 /**
1841 * xmlFAEliminateSimpleEpsilonTransitions:
1842 * @ctxt: a regexp parser context
1843 *
1844 * Eliminating general epsilon transitions can get costly in the general
1845 * algorithm due to the large amount of generated new transitions and
1846 * associated comparisons. However for simple epsilon transition used just
1847 * to separate building blocks when generating the automata this can be
1848 * reduced to state elimination:
1849 * - if there exists an epsilon from X to Y
1850 * - if there is no other transition from X
1851 * then X and Y are semantically equivalent and X can be eliminated
1852 * If X is the start state then make Y the start state, else replace the
1853 * target of all transitions to X by transitions to Y.
1854 */
1855 static void
1856 xmlFAEliminateSimpleEpsilonTransitions(xmlRegParserCtxtPtr ctxt) {
1857 int statenr, i, j, newto;
1858 xmlRegStatePtr state, tmp;
1859
1860 for (statenr = 0;statenr < ctxt->nbStates;statenr++) {
1861 state = ctxt->states[statenr];
1862 if (state == NULL)
1863 continue;
1864 if (state->nbTrans != 1)
1865 continue;
1866 if (state->type == XML_REGEXP_UNREACH_STATE)
1867 continue;
1868 /* is the only transition out a basic transition */
1869 if ((state->trans[0].atom == NULL) &&
1870 (state->trans[0].to >= 0) &&
1871 (state->trans[0].to != statenr) &&
1872 (state->trans[0].counter < 0) &&
1873 (state->trans[0].count < 0)) {
1874 newto = state->trans[0].to;
1875
1876 if (state->type == XML_REGEXP_START_STATE) {
1877 #ifdef DEBUG_REGEXP_GRAPH
1878 printf("Found simple epsilon trans from start %d to %d\n",
1879 statenr, newto);
1880 #endif
1881 } else {
1882 #ifdef DEBUG_REGEXP_GRAPH
1883 printf("Found simple epsilon trans from %d to %d\n",
1884 statenr, newto);
1885 #endif
1886 for (i = 0;i < state->nbTransTo;i++) {
1887 tmp = ctxt->states[state->transTo[i]];
1888 for (j = 0;j < tmp->nbTrans;j++) {
1889 if (tmp->trans[j].to == statenr) {
1890 #ifdef DEBUG_REGEXP_GRAPH
1891 printf("Changed transition %d on %d to go to %d\n",
1892 j, tmp->no, newto);
1893 #endif
1894 tmp->trans[j].to = -1;
1895 xmlRegStateAddTrans(ctxt, tmp, tmp->trans[j].atom,
1896 ctxt->states[newto],
1897 tmp->trans[j].counter,
1898 tmp->trans[j].count);
1899 }
1900 }
1901 }
1902 if (state->type == XML_REGEXP_FINAL_STATE)
1903 ctxt->states[newto]->type = XML_REGEXP_FINAL_STATE;
1904 /* eliminate the transition completely */
1905 state->nbTrans = 0;
1906
1907 state->type = XML_REGEXP_UNREACH_STATE;
1908
1909 }
1910
1911 }
1912 }
1913 }
1914 /**
1915 * xmlFAEliminateEpsilonTransitions:
1916 * @ctxt: a regexp parser context
1917 *
1918 */
1919 static void
1920 xmlFAEliminateEpsilonTransitions(xmlRegParserCtxtPtr ctxt) {
1921 int statenr, transnr;
1922 xmlRegStatePtr state;
1923 int has_epsilon;
1924
1925 if (ctxt->states == NULL) return;
1926
1927 /*
1928 * Eliminate simple epsilon transition and the associated unreachable
1929 * states.
1930 */
1931 xmlFAEliminateSimpleEpsilonTransitions(ctxt);
1932 for (statenr = 0;statenr < ctxt->nbStates;statenr++) {
1933 state = ctxt->states[statenr];
1934 if ((state != NULL) && (state->type == XML_REGEXP_UNREACH_STATE)) {
1935 #ifdef DEBUG_REGEXP_GRAPH
1936 printf("Removed unreachable state %d\n", statenr);
1937 #endif
1938 xmlRegFreeState(state);
1939 ctxt->states[statenr] = NULL;
1940 }
1941 }
1942
1943 has_epsilon = 0;
1944
1945 /*
1946 * Build the completed transitions bypassing the epsilons
1947 * Use a marking algorithm to avoid loops
1948 * Mark sink states too.
1949 * Process from the latests states backward to the start when
1950 * there is long cascading epsilon chains this minimize the
1951 * recursions and transition compares when adding the new ones
1952 */
1953 for (statenr = ctxt->nbStates - 1;statenr >= 0;statenr--) {
1954 state = ctxt->states[statenr];
1955 if (state == NULL)
1956 continue;
1957 if ((state->nbTrans == 0) &&
1958 (state->type != XML_REGEXP_FINAL_STATE)) {
1959 state->type = XML_REGEXP_SINK_STATE;
1960 }
1961 for (transnr = 0;transnr < state->nbTrans;transnr++) {
1962 if ((state->trans[transnr].atom == NULL) &&
1963 (state->trans[transnr].to >= 0)) {
1964 if (state->trans[transnr].to == statenr) {
1965 state->trans[transnr].to = -1;
1966 #ifdef DEBUG_REGEXP_GRAPH
1967 printf("Removed loopback epsilon trans %d on %d\n",
1968 transnr, statenr);
1969 #endif
1970 } else if (state->trans[transnr].count < 0) {
1971 int newto = state->trans[transnr].to;
1972
1973 #ifdef DEBUG_REGEXP_GRAPH
1974 printf("Found epsilon trans %d from %d to %d\n",
1975 transnr, statenr, newto);
1976 #endif
1977 has_epsilon = 1;
1978 state->trans[transnr].to = -2;
1979 state->mark = XML_REGEXP_MARK_START;
1980 xmlFAReduceEpsilonTransitions(ctxt, statenr,
1981 newto, state->trans[transnr].counter);
1982 state->mark = XML_REGEXP_MARK_NORMAL;
1983 #ifdef DEBUG_REGEXP_GRAPH
1984 } else {
1985 printf("Found counted transition %d on %d\n",
1986 transnr, statenr);
1987 #endif
1988 }
1989 }
1990 }
1991 }
1992 /*
1993 * Eliminate the epsilon transitions
1994 */
1995 if (has_epsilon) {
1996 for (statenr = 0;statenr < ctxt->nbStates;statenr++) {
1997 state = ctxt->states[statenr];
1998 if (state == NULL)
1999 continue;
2000 for (transnr = 0;transnr < state->nbTrans;transnr++) {
2001 xmlRegTransPtr trans = &(state->trans[transnr]);
2002 if ((trans->atom == NULL) &&
2003 (trans->count < 0) &&
2004 (trans->to >= 0)) {
2005 trans->to = -1;
2006 }
2007 }
2008 }
2009 }
2010
2011 /*
2012 * Use this pass to detect unreachable states too
2013 */
2014 for (statenr = 0;statenr < ctxt->nbStates;statenr++) {
2015 state = ctxt->states[statenr];
2016 if (state != NULL)
2017 state->reached = XML_REGEXP_MARK_NORMAL;
2018 }
2019 state = ctxt->states[0];
2020 if (state != NULL)
2021 state->reached = XML_REGEXP_MARK_START;
2022 while (state != NULL) {
2023 xmlRegStatePtr target = NULL;
2024 state->reached = XML_REGEXP_MARK_VISITED;
2025 /*
2026 * Mark all states reachable from the current reachable state
2027 */
2028 for (transnr = 0;transnr < state->nbTrans;transnr++) {
2029 if ((state->trans[transnr].to >= 0) &&
2030 ((state->trans[transnr].atom != NULL) ||
2031 (state->trans[transnr].count >= 0))) {
2032 int newto = state->trans[transnr].to;
2033
2034 if (ctxt->states[newto] == NULL)
2035 continue;
2036 if (ctxt->states[newto]->reached == XML_REGEXP_MARK_NORMAL) {
2037 ctxt->states[newto]->reached = XML_REGEXP_MARK_START;
2038 target = ctxt->states[newto];
2039 }
2040 }
2041 }
2042
2043 /*
2044 * find the next accessible state not explored
2045 */
2046 if (target == NULL) {
2047 for (statenr = 1;statenr < ctxt->nbStates;statenr++) {
2048 state = ctxt->states[statenr];
2049 if ((state != NULL) && (state->reached ==
2050 XML_REGEXP_MARK_START)) {
2051 target = state;
2052 break;
2053 }
2054 }
2055 }
2056 state = target;
2057 }
2058 for (statenr = 0;statenr < ctxt->nbStates;statenr++) {
2059 state = ctxt->states[statenr];
2060 if ((state != NULL) && (state->reached == XML_REGEXP_MARK_NORMAL)) {
2061 #ifdef DEBUG_REGEXP_GRAPH
2062 printf("Removed unreachable state %d\n", statenr);
2063 #endif
2064 xmlRegFreeState(state);
2065 ctxt->states[statenr] = NULL;
2066 }
2067 }
2068
2069 }
2070
2071 static int
2072 xmlFACompareRanges(xmlRegRangePtr range1, xmlRegRangePtr range2) {
2073 int ret = 0;
2074
2075 if ((range1->type == XML_REGEXP_RANGES) ||
2076 (range2->type == XML_REGEXP_RANGES) ||
2077 (range2->type == XML_REGEXP_SUBREG) ||
2078 (range1->type == XML_REGEXP_SUBREG) ||
2079 (range1->type == XML_REGEXP_STRING) ||
2080 (range2->type == XML_REGEXP_STRING))
2081 return(-1);
2082
2083 /* put them in order */
2084 if (range1->type > range2->type) {
2085 xmlRegRangePtr tmp;
2086
2087 tmp = range1;
2088 range1 = range2;
2089 range2 = tmp;
2090 }
2091 if ((range1->type == XML_REGEXP_ANYCHAR) ||
2092 (range2->type == XML_REGEXP_ANYCHAR)) {
2093 ret = 1;
2094 } else if ((range1->type == XML_REGEXP_EPSILON) ||
2095 (range2->type == XML_REGEXP_EPSILON)) {
2096 return(0);
2097 } else if (range1->type == range2->type) {
2098 if (range1->type != XML_REGEXP_CHARVAL)
2099 ret = 1;
2100 else if ((range1->end < range2->start) ||
2101 (range2->end < range1->start))
2102 ret = 0;
2103 else
2104 ret = 1;
2105 } else if (range1->type == XML_REGEXP_CHARVAL) {
2106 int codepoint;
2107 int neg = 0;
2108
2109 /*
2110 * just check all codepoints in the range for acceptance,
2111 * this is usually way cheaper since done only once at
2112 * compilation than testing over and over at runtime or
2113 * pushing too many states when evaluating.
2114 */
2115 if (((range1->neg == 0) && (range2->neg != 0)) ||
2116 ((range1->neg != 0) && (range2->neg == 0)))
2117 neg = 1;
2118
2119 for (codepoint = range1->start;codepoint <= range1->end ;codepoint++) {
2120 ret = xmlRegCheckCharacterRange(range2->type, codepoint,
2121 0, range2->start, range2->end,
2122 range2->blockName);
2123 if (ret < 0)
2124 return(-1);
2125 if (((neg == 1) && (ret == 0)) ||
2126 ((neg == 0) && (ret == 1)))
2127 return(1);
2128 }
2129 return(0);
2130 } else if ((range1->type == XML_REGEXP_BLOCK_NAME) ||
2131 (range2->type == XML_REGEXP_BLOCK_NAME)) {
2132 if (range1->type == range2->type) {
2133 ret = xmlStrEqual(range1->blockName, range2->blockName);
2134 } else {
2135 /*
2136 * comparing a block range with anything else is way
2137 * too costly, and maintining the table is like too much
2138 * memory too, so let's force the automata to save state
2139 * here.
2140 */
2141 return(1);
2142 }
2143 } else if ((range1->type < XML_REGEXP_LETTER) ||
2144 (range2->type < XML_REGEXP_LETTER)) {
2145 if ((range1->type == XML_REGEXP_ANYSPACE) &&
2146 (range2->type == XML_REGEXP_NOTSPACE))
2147 ret = 0;
2148 else if ((range1->type == XML_REGEXP_INITNAME) &&
2149 (range2->type == XML_REGEXP_NOTINITNAME))
2150 ret = 0;
2151 else if ((range1->type == XML_REGEXP_NAMECHAR) &&
2152 (range2->type == XML_REGEXP_NOTNAMECHAR))
2153 ret = 0;
2154 else if ((range1->type == XML_REGEXP_DECIMAL) &&
2155 (range2->type == XML_REGEXP_NOTDECIMAL))
2156 ret = 0;
2157 else if ((range1->type == XML_REGEXP_REALCHAR) &&
2158 (range2->type == XML_REGEXP_NOTREALCHAR))
2159 ret = 0;
2160 else {
2161 /* same thing to limit complexity */
2162 return(1);
2163 }
2164 } else {
2165 ret = 0;
2166 /* range1->type < range2->type here */
2167 switch (range1->type) {
2168 case XML_REGEXP_LETTER:
2169 /* all disjoint except in the subgroups */
2170 if ((range2->type == XML_REGEXP_LETTER_UPPERCASE) ||
2171 (range2->type == XML_REGEXP_LETTER_LOWERCASE) ||
2172 (range2->type == XML_REGEXP_LETTER_TITLECASE) ||
2173 (range2->type == XML_REGEXP_LETTER_MODIFIER) ||
2174 (range2->type == XML_REGEXP_LETTER_OTHERS))
2175 ret = 1;
2176 break;
2177 case XML_REGEXP_MARK:
2178 if ((range2->type == XML_REGEXP_MARK_NONSPACING) ||
2179 (range2->type == XML_REGEXP_MARK_SPACECOMBINING) ||
2180 (range2->type == XML_REGEXP_MARK_ENCLOSING))
2181 ret = 1;
2182 break;
2183 case XML_REGEXP_NUMBER:
2184 if ((range2->type == XML_REGEXP_NUMBER_DECIMAL) ||
2185 (range2->type == XML_REGEXP_NUMBER_LETTER) ||
2186 (range2->type == XML_REGEXP_NUMBER_OTHERS))
2187 ret = 1;
2188 break;
2189 case XML_REGEXP_PUNCT:
2190 if ((range2->type == XML_REGEXP_PUNCT_CONNECTOR) ||
2191 (range2->type == XML_REGEXP_PUNCT_DASH) ||
2192 (range2->type == XML_REGEXP_PUNCT_OPEN) ||
2193 (range2->type == XML_REGEXP_PUNCT_CLOSE) ||
2194 (range2->type == XML_REGEXP_PUNCT_INITQUOTE) ||
2195 (range2->type == XML_REGEXP_PUNCT_FINQUOTE) ||
2196 (range2->type == XML_REGEXP_PUNCT_OTHERS))
2197 ret = 1;
2198 break;
2199 case XML_REGEXP_SEPAR:
2200 if ((range2->type == XML_REGEXP_SEPAR_SPACE) ||
2201 (range2->type == XML_REGEXP_SEPAR_LINE) ||
2202 (range2->type == XML_REGEXP_SEPAR_PARA))
2203 ret = 1;
2204 break;
2205 case XML_REGEXP_SYMBOL:
2206 if ((range2->type == XML_REGEXP_SYMBOL_MATH) ||
2207 (range2->type == XML_REGEXP_SYMBOL_CURRENCY) ||
2208 (range2->type == XML_REGEXP_SYMBOL_MODIFIER) ||
2209 (range2->type == XML_REGEXP_SYMBOL_OTHERS))
2210 ret = 1;
2211 break;
2212 case XML_REGEXP_OTHER:
2213 if ((range2->type == XML_REGEXP_OTHER_CONTROL) ||
2214 (range2->type == XML_REGEXP_OTHER_FORMAT) ||
2215 (range2->type == XML_REGEXP_OTHER_PRIVATE))
2216 ret = 1;
2217 break;
2218 default:
2219 if ((range2->type >= XML_REGEXP_LETTER) &&
2220 (range2->type < XML_REGEXP_BLOCK_NAME))
2221 ret = 0;
2222 else {
2223 /* safety net ! */
2224 return(1);
2225 }
2226 }
2227 }
2228 if (((range1->neg == 0) && (range2->neg != 0)) ||
2229 ((range1->neg != 0) && (range2->neg == 0)))
2230 ret = !ret;
2231 return(ret);
2232 }
2233
2234 /**
2235 * xmlFACompareAtomTypes:
2236 * @type1: an atom type
2237 * @type2: an atom type
2238 *
2239 * Compares two atoms type to check whether they intersect in some ways,
2240 * this is used by xmlFACompareAtoms only
2241 *
2242 * Returns 1 if they may intersect and 0 otherwise
2243 */
2244 static int
2245 xmlFACompareAtomTypes(xmlRegAtomType type1, xmlRegAtomType type2) {
2246 if ((type1 == XML_REGEXP_EPSILON) ||
2247 (type1 == XML_REGEXP_CHARVAL) ||
2248 (type1 == XML_REGEXP_RANGES) ||
2249 (type1 == XML_REGEXP_SUBREG) ||
2250 (type1 == XML_REGEXP_STRING) ||
2251 (type1 == XML_REGEXP_ANYCHAR))
2252 return(1);
2253 if ((type2 == XML_REGEXP_EPSILON) ||
2254 (type2 == XML_REGEXP_CHARVAL) ||
2255 (type2 == XML_REGEXP_RANGES) ||
2256 (type2 == XML_REGEXP_SUBREG) ||
2257 (type2 == XML_REGEXP_STRING) ||
2258 (type2 == XML_REGEXP_ANYCHAR))
2259 return(1);
2260
2261 if (type1 == type2) return(1);
2262
2263 /* simplify subsequent compares by making sure type1 < type2 */
2264 if (type1 > type2) {
2265 xmlRegAtomType tmp = type1;
2266 type1 = type2;
2267 type2 = tmp;
2268 }
2269 switch (type1) {
2270 case XML_REGEXP_ANYSPACE: /* \s */
2271 /* can't be a letter, number, mark, pontuation, symbol */
2272 if ((type2 == XML_REGEXP_NOTSPACE) ||
2273 ((type2 >= XML_REGEXP_LETTER) &&
2274 (type2 <= XML_REGEXP_LETTER_OTHERS)) ||
2275 ((type2 >= XML_REGEXP_NUMBER) &&
2276 (type2 <= XML_REGEXP_NUMBER_OTHERS)) ||
2277 ((type2 >= XML_REGEXP_MARK) &&
2278 (type2 <= XML_REGEXP_MARK_ENCLOSING)) ||
2279 ((type2 >= XML_REGEXP_PUNCT) &&
2280 (type2 <= XML_REGEXP_PUNCT_OTHERS)) ||
2281 ((type2 >= XML_REGEXP_SYMBOL) &&
2282 (type2 <= XML_REGEXP_SYMBOL_OTHERS))
2283 ) return(0);
2284 break;
2285 case XML_REGEXP_NOTSPACE: /* \S */
2286 break;
2287 case XML_REGEXP_INITNAME: /* \l */
2288 /* can't be a number, mark, separator, pontuation, symbol or other */
2289 if ((type2 == XML_REGEXP_NOTINITNAME) ||
2290 ((type2 >= XML_REGEXP_NUMBER) &&
2291 (type2 <= XML_REGEXP_NUMBER_OTHERS)) ||
2292 ((type2 >= XML_REGEXP_MARK) &&
2293 (type2 <= XML_REGEXP_MARK_ENCLOSING)) ||
2294 ((type2 >= XML_REGEXP_SEPAR) &&
2295 (type2 <= XML_REGEXP_SEPAR_PARA)) ||
2296 ((type2 >= XML_REGEXP_PUNCT) &&
2297 (type2 <= XML_REGEXP_PUNCT_OTHERS)) ||
2298 ((type2 >= XML_REGEXP_SYMBOL) &&
2299 (type2 <= XML_REGEXP_SYMBOL_OTHERS)) ||
2300 ((type2 >= XML_REGEXP_OTHER) &&
2301 (type2 <= XML_REGEXP_OTHER_NA))
2302 ) return(0);
2303 break;
2304 case XML_REGEXP_NOTINITNAME: /* \L */
2305 break;
2306 case XML_REGEXP_NAMECHAR: /* \c */
2307 /* can't be a mark, separator, pontuation, symbol or other */
2308 if ((type2 == XML_REGEXP_NOTNAMECHAR) ||
2309 ((type2 >= XML_REGEXP_MARK) &&
2310 (type2 <= XML_REGEXP_MARK_ENCLOSING)) ||
2311 ((type2 >= XML_REGEXP_PUNCT) &&
2312 (type2 <= XML_REGEXP_PUNCT_OTHERS)) ||
2313 ((type2 >= XML_REGEXP_SEPAR) &&
2314 (type2 <= XML_REGEXP_SEPAR_PARA)) ||
2315 ((type2 >= XML_REGEXP_SYMBOL) &&
2316 (type2 <= XML_REGEXP_SYMBOL_OTHERS)) ||
2317 ((type2 >= XML_REGEXP_OTHER) &&
2318 (type2 <= XML_REGEXP_OTHER_NA))
2319 ) return(0);
2320 break;
2321 case XML_REGEXP_NOTNAMECHAR: /* \C */
2322 break;
2323 case XML_REGEXP_DECIMAL: /* \d */
2324 /* can't be a letter, mark, separator, pontuation, symbol or other */
2325 if ((type2 == XML_REGEXP_NOTDECIMAL) ||
2326 (type2 == XML_REGEXP_REALCHAR) ||
2327 ((type2 >= XML_REGEXP_LETTER) &&
2328 (type2 <= XML_REGEXP_LETTER_OTHERS)) ||
2329 ((type2 >= XML_REGEXP_MARK) &&
2330 (type2 <= XML_REGEXP_MARK_ENCLOSING)) ||
2331 ((type2 >= XML_REGEXP_PUNCT) &&
2332 (type2 <= XML_REGEXP_PUNCT_OTHERS)) ||
2333 ((type2 >= XML_REGEXP_SEPAR) &&
2334 (type2 <= XML_REGEXP_SEPAR_PARA)) ||
2335 ((type2 >= XML_REGEXP_SYMBOL) &&
2336 (type2 <= XML_REGEXP_SYMBOL_OTHERS)) ||
2337 ((type2 >= XML_REGEXP_OTHER) &&
2338 (type2 <= XML_REGEXP_OTHER_NA))
2339 )return(0);
2340 break;
2341 case XML_REGEXP_NOTDECIMAL: /* \D */
2342 break;
2343 case XML_REGEXP_REALCHAR: /* \w */
2344 /* can't be a mark, separator, pontuation, symbol or other */
2345 if ((type2 == XML_REGEXP_NOTDECIMAL) ||
2346 ((type2 >= XML_REGEXP_MARK) &&
2347 (type2 <= XML_REGEXP_MARK_ENCLOSING)) ||
2348 ((type2 >= XML_REGEXP_PUNCT) &&
2349 (type2 <= XML_REGEXP_PUNCT_OTHERS)) ||
2350 ((type2 >= XML_REGEXP_SEPAR) &&
2351 (type2 <= XML_REGEXP_SEPAR_PARA)) ||
2352 ((type2 >= XML_REGEXP_SYMBOL) &&
2353 (type2 <= XML_REGEXP_SYMBOL_OTHERS)) ||
2354 ((type2 >= XML_REGEXP_OTHER) &&
2355 (type2 <= XML_REGEXP_OTHER_NA))
2356 )return(0);
2357 break;
2358 case XML_REGEXP_NOTREALCHAR: /* \W */
2359 break;
2360 /*
2361 * at that point we know both type 1 and type2 are from
2362 * character categories are ordered and are different,
2363 * it becomes simple because this is a partition
2364 */
2365 case XML_REGEXP_LETTER:
2366 if (type2 <= XML_REGEXP_LETTER_OTHERS)
2367 return(1);
2368 return(0);
2369 case XML_REGEXP_LETTER_UPPERCASE:
2370 case XML_REGEXP_LETTER_LOWERCASE:
2371 case XML_REGEXP_LETTER_TITLECASE:
2372 case XML_REGEXP_LETTER_MODIFIER:
2373 case XML_REGEXP_LETTER_OTHERS:
2374 return(0);
2375 case XML_REGEXP_MARK:
2376 if (type2 <= XML_REGEXP_MARK_ENCLOSING)
2377 return(1);
2378 return(0);
2379 case XML_REGEXP_MARK_NONSPACING:
2380 case XML_REGEXP_MARK_SPACECOMBINING:
2381 case XML_REGEXP_MARK_ENCLOSING:
2382 return(0);
2383 case XML_REGEXP_NUMBER:
2384 if (type2 <= XML_REGEXP_NUMBER_OTHERS)
2385 return(1);
2386 return(0);
2387 case XML_REGEXP_NUMBER_DECIMAL:
2388 case XML_REGEXP_NUMBER_LETTER:
2389 case XML_REGEXP_NUMBER_OTHERS:
2390 return(0);
2391 case XML_REGEXP_PUNCT:
2392 if (type2 <= XML_REGEXP_PUNCT_OTHERS)
2393 return(1);
2394 return(0);
2395 case XML_REGEXP_PUNCT_CONNECTOR:
2396 case XML_REGEXP_PUNCT_DASH:
2397 case XML_REGEXP_PUNCT_OPEN:
2398 case XML_REGEXP_PUNCT_CLOSE:
2399 case XML_REGEXP_PUNCT_INITQUOTE:
2400 case XML_REGEXP_PUNCT_FINQUOTE:
2401 case XML_REGEXP_PUNCT_OTHERS:
2402 return(0);
2403 case XML_REGEXP_SEPAR:
2404 if (type2 <= XML_REGEXP_SEPAR_PARA)
2405 return(1);
2406 return(0);
2407 case XML_REGEXP_SEPAR_SPACE:
2408 case XML_REGEXP_SEPAR_LINE:
2409 case XML_REGEXP_SEPAR_PARA:
2410 return(0);
2411 case XML_REGEXP_SYMBOL:
2412 if (type2 <= XML_REGEXP_SYMBOL_OTHERS)
2413 return(1);
2414 return(0);
2415 case XML_REGEXP_SYMBOL_MATH:
2416 case XML_REGEXP_SYMBOL_CURRENCY:
2417 case XML_REGEXP_SYMBOL_MODIFIER:
2418 case XML_REGEXP_SYMBOL_OTHERS:
2419 return(0);
2420 case XML_REGEXP_OTHER:
2421 if (type2 <= XML_REGEXP_OTHER_NA)
2422 return(1);
2423 return(0);
2424 case XML_REGEXP_OTHER_CONTROL:
2425 case XML_REGEXP_OTHER_FORMAT:
2426 case XML_REGEXP_OTHER_PRIVATE:
2427 case XML_REGEXP_OTHER_NA:
2428 return(0);
2429 default:
2430 break;
2431 }
2432 return(1);
2433 }
2434
2435 /**
2436 * xmlFAEqualAtoms:
2437 * @atom1: an atom
2438 * @atom2: an atom
2439 * @deep: if not set only compare string pointers
2440 *
2441 * Compares two atoms to check whether they are the same exactly
2442 * this is used to remove equivalent transitions
2443 *
2444 * Returns 1 if same and 0 otherwise
2445 */
2446 static int
2447 xmlFAEqualAtoms(xmlRegAtomPtr atom1, xmlRegAtomPtr atom2, int deep) {
2448 int ret = 0;
2449
2450 if (atom1 == atom2)
2451 return(1);
2452 if ((atom1 == NULL) || (atom2 == NULL))
2453 return(0);
2454
2455 if (atom1->type != atom2->type)
2456 return(0);
2457 switch (atom1->type) {
2458 case XML_REGEXP_EPSILON:
2459 ret = 0;
2460 break;
2461 case XML_REGEXP_STRING:
2462 if (!deep)
2463 ret = (atom1->valuep == atom2->valuep);
2464 else
2465 ret = xmlStrEqual((xmlChar *)atom1->valuep,
2466 (xmlChar *)atom2->valuep);
2467 break;
2468 case XML_REGEXP_CHARVAL:
2469 ret = (atom1->codepoint == atom2->codepoint);
2470 break;
2471 case XML_REGEXP_RANGES:
2472 /* too hard to do in the general case */
2473 ret = 0;
2474 default:
2475 break;
2476 }
2477 return(ret);
2478 }
2479
2480 /**
2481 * xmlFACompareAtoms:
2482 * @atom1: an atom
2483 * @atom2: an atom
2484 * @deep: if not set only compare string pointers
2485 *
2486 * Compares two atoms to check whether they intersect in some ways,
2487 * this is used by xmlFAComputesDeterminism and xmlFARecurseDeterminism only
2488 *
2489 * Returns 1 if yes and 0 otherwise
2490 */
2491 static int
2492 xmlFACompareAtoms(xmlRegAtomPtr atom1, xmlRegAtomPtr atom2, int deep) {
2493 int ret = 1;
2494
2495 if (atom1 == atom2)
2496 return(1);
2497 if ((atom1 == NULL) || (atom2 == NULL))
2498 return(0);
2499
2500 if ((atom1->type == XML_REGEXP_ANYCHAR) ||
2501 (atom2->type == XML_REGEXP_ANYCHAR))
2502 return(1);
2503
2504 if (atom1->type > atom2->type) {
2505 xmlRegAtomPtr tmp;
2506 tmp = atom1;
2507 atom1 = atom2;
2508 atom2 = tmp;
2509 }
2510 if (atom1->type != atom2->type) {
2511 ret = xmlFACompareAtomTypes(atom1->type, atom2->type);
2512 /* if they can't intersect at the type level break now */
2513 if (ret == 0)
2514 return(0);
2515 }
2516 switch (atom1->type) {
2517 case XML_REGEXP_STRING:
2518 if (!deep)
2519 ret = (atom1->valuep != atom2->valuep);
2520 else
2521 ret = xmlRegStrEqualWildcard((xmlChar *)atom1->valuep,
2522 (xmlChar *)atom2->valuep);
2523 break;
2524 case XML_REGEXP_EPSILON:
2525 goto not_determinist;
2526 case XML_REGEXP_CHARVAL:
2527 if (atom2->type == XML_REGEXP_CHARVAL) {
2528 ret = (atom1->codepoint == atom2->codepoint);
2529 } else {
2530 ret = xmlRegCheckCharacter(atom2, atom1->codepoint);
2531 if (ret < 0)
2532 ret = 1;
2533 }
2534 break;
2535 case XML_REGEXP_RANGES:
2536 if (atom2->type == XML_REGEXP_RANGES) {
2537 int i, j, res;
2538 xmlRegRangePtr r1, r2;
2539
2540 /*
2541 * need to check that none of the ranges eventually matches
2542 */
2543 for (i = 0;i < atom1->nbRanges;i++) {
2544 for (j = 0;j < atom2->nbRanges;j++) {
2545 r1 = atom1->ranges[i];
2546 r2 = atom2->ranges[j];
2547 res = xmlFACompareRanges(r1, r2);
2548 if (res == 1) {
2549 ret = 1;
2550 goto done;
2551 }
2552 }
2553 }
2554 ret = 0;
2555 }
2556 break;
2557 default:
2558 goto not_determinist;
2559 }
2560 done:
2561 if (atom1->neg != atom2->neg) {
2562 ret = !ret;
2563 }
2564 if (ret == 0)
2565 return(0);
2566 not_determinist:
2567 return(1);
2568 }
2569
2570 /**
2571 * xmlFARecurseDeterminism:
2572 * @ctxt: a regexp parser context
2573 *
2574 * Check whether the associated regexp is determinist,
2575 * should be called after xmlFAEliminateEpsilonTransitions()
2576 *
2577 */
2578 static int
2579 xmlFARecurseDeterminism(xmlRegParserCtxtPtr ctxt, xmlRegStatePtr state,
2580 int to, xmlRegAtomPtr atom) {
2581 int ret = 1;
2582 int res;
2583 int transnr, nbTrans;
2584 xmlRegTransPtr t1;
2585 int deep = 1;
2586
2587 if (state == NULL)
2588 return(ret);
2589
2590 if (ctxt->flags & AM_AUTOMATA_RNG)
2591 deep = 0;
2592
2593 /*
2594 * don't recurse on transitions potentially added in the course of
2595 * the elimination.
2596 */
2597 nbTrans = state->nbTrans;
2598 for (transnr = 0;transnr < nbTrans;transnr++) {
2599 t1 = &(state->trans[transnr]);
2600 /*
2601 * check transitions conflicting with the one looked at
2602 */
2603 if (t1->atom == NULL) {
2604 if (t1->to < 0)
2605 continue;
2606 res = xmlFARecurseDeterminism(ctxt, ctxt->states[t1->to],
2607 to, atom);
2608 if (res == 0) {
2609 ret = 0;
2610 /* t1->nd = 1; */
2611 }
2612 continue;
2613 }
2614 if (t1->to != to)
2615 continue;
2616 if (xmlFACompareAtoms(t1->atom, atom, deep)) {
2617 ret = 0;
2618 /* mark the transition as non-deterministic */
2619 t1->nd = 1;
2620 }
2621 }
2622 return(ret);
2623 }
2624
2625 /**
2626 * xmlFAComputesDeterminism:
2627 * @ctxt: a regexp parser context
2628 *
2629 * Check whether the associated regexp is determinist,
2630 * should be called after xmlFAEliminateEpsilonTransitions()
2631 *
2632 */
2633 static int
2634 xmlFAComputesDeterminism(xmlRegParserCtxtPtr ctxt) {
2635 int statenr, transnr;
2636 xmlRegStatePtr state;
2637 xmlRegTransPtr t1, t2, last;
2638 int i;
2639 int ret = 1;
2640 int deep = 1;
2641
2642 #ifdef DEBUG_REGEXP_GRAPH
2643 printf("xmlFAComputesDeterminism\n");
2644 xmlRegPrintCtxt(stdout, ctxt);
2645 #endif
2646 if (ctxt->determinist != -1)
2647 return(ctxt->determinist);
2648
2649 if (ctxt->flags & AM_AUTOMATA_RNG)
2650 deep = 0;
2651
2652 /*
2653 * First cleanup the automata removing cancelled transitions
2654 */
2655 for (statenr = 0;statenr < ctxt->nbStates;statenr++) {
2656 state = ctxt->states[statenr];
2657 if (state == NULL)
2658 continue;
2659 if (state->nbTrans < 2)
2660 continue;
2661 for (transnr = 0;transnr < state->nbTrans;transnr++) {
2662 t1 = &(state->trans[transnr]);
2663 /*
2664 * Determinism checks in case of counted or all transitions
2665 * will have to be handled separately
2666 */
2667 if (t1->atom == NULL) {
2668 /* t1->nd = 1; */
2669 continue;
2670 }
2671 if (t1->to == -1) /* eliminated */
2672 continue;
2673 for (i = 0;i < transnr;i++) {
2674 t2 = &(state->trans[i]);
2675 if (t2->to == -1) /* eliminated */
2676 continue;
2677 if (t2->atom != NULL) {
2678 if (t1->to == t2->to) {
2679 /*
2680 * Here we use deep because we want to keep the
2681 * transitions which indicate a conflict
2682 */
2683 if (xmlFAEqualAtoms(t1->atom, t2->atom, deep) &&
2684 (t1->counter == t2->counter) &&
2685 (t1->count == t2->count))
2686 t2->to = -1; /* eliminated */
2687 }
2688 }
2689 }
2690 }
2691 }
2692
2693 /*
2694 * Check for all states that there aren't 2 transitions
2695 * with the same atom and a different target.
2696 */
2697 for (statenr = 0;statenr < ctxt->nbStates;statenr++) {
2698 state = ctxt->states[statenr];
2699 if (state == NULL)
2700 continue;
2701 if (state->nbTrans < 2)
2702 continue;
2703 last = NULL;
2704 for (transnr = 0;transnr < state->nbTrans;transnr++) {
2705 t1 = &(state->trans[transnr]);
2706 /*
2707 * Determinism checks in case of counted or all transitions
2708 * will have to be handled separately
2709 */
2710 if (t1->atom == NULL) {
2711 continue;
2712 }
2713 if (t1->to == -1) /* eliminated */
2714 continue;
2715 for (i = 0;i < transnr;i++) {
2716 t2 = &(state->trans[i]);
2717 if (t2->to == -1) /* eliminated */
2718 continue;
2719 if (t2->atom != NULL) {
2720 /*
2721 * But here we don't use deep because we want to
2722 * find transitions which indicate a conflict
2723 */
2724 if (xmlFACompareAtoms(t1->atom, t2->atom, 1)) {
2725 ret = 0;
2726 /* mark the transitions as non-deterministic ones */
2727 t1->nd = 1;
2728 t2->nd = 1;
2729 last = t1;
2730 }
2731 } else if (t1->to != -1) {
2732 /*
2733 * do the closure in case of remaining specific
2734 * epsilon transitions like choices or all
2735 */
2736 ret = xmlFARecurseDeterminism(ctxt, ctxt->states[t1->to],
2737 t2->to, t2->atom);
2738 /* don't shortcut the computation so all non deterministic
2739 transition get marked down
2740 if (ret == 0)
2741 return(0);
2742 */
2743 if (ret == 0) {
2744 t1->nd = 1;
2745 /* t2->nd = 1; */
2746 last = t1;
2747 }
2748 }
2749 }
2750 /* don't shortcut the computation so all non deterministic
2751 transition get marked down
2752 if (ret == 0)
2753 break; */
2754 }
2755
2756 /*
2757 * mark specifically the last non-deterministic transition
2758 * from a state since there is no need to set-up rollback
2759 * from it
2760 */
2761 if (last != NULL) {
2762 last->nd = 2;
2763 }
2764
2765 /* don't shortcut the computation so all non deterministic
2766 transition get marked down
2767 if (ret == 0)
2768 break; */
2769 }
2770
2771 ctxt->determinist = ret;
2772 return(ret);
2773 }
2774
2775 /************************************************************************
2776 * *
2777 * Routines to check input against transition atoms *
2778 * *
2779 ************************************************************************/
2780
2781 static int
2782 xmlRegCheckCharacterRange(xmlRegAtomType type, int codepoint, int neg,
2783 int start, int end, const xmlChar *blockName) {
2784 int ret = 0;
2785
2786 switch (type) {
2787 case XML_REGEXP_STRING:
2788 case XML_REGEXP_SUBREG:
2789 case XML_REGEXP_RANGES:
2790 case XML_REGEXP_EPSILON:
2791 return(-1);
2792 case XML_REGEXP_ANYCHAR:
2793 ret = ((codepoint != '\n') && (codepoint != '\r'));
2794 break;
2795 case XML_REGEXP_CHARVAL:
2796 ret = ((codepoint >= start) && (codepoint <= end));
2797 break;
2798 case XML_REGEXP_NOTSPACE:
2799 neg = !neg;
2800 case XML_REGEXP_ANYSPACE:
2801 ret = ((codepoint == '\n') || (codepoint == '\r') ||
2802 (codepoint == '\t') || (codepoint == ' '));
2803 break;
2804 case XML_REGEXP_NOTINITNAME:
2805 neg = !neg;
2806 case XML_REGEXP_INITNAME:
2807 ret = (IS_LETTER(codepoint) ||
2808 (codepoint == '_') || (codepoint == ':'));
2809 break;
2810 case XML_REGEXP_NOTNAMECHAR:
2811 neg = !neg;
2812 case XML_REGEXP_NAMECHAR:
2813 ret = (IS_LETTER(codepoint) || IS_DIGIT(codepoint) ||
2814 (codepoint == '.') || (codepoint == '-') ||
2815 (codepoint == '_') || (codepoint == ':') ||
2816 IS_COMBINING(codepoint) || IS_EXTENDER(codepoint));
2817 break;
2818 case XML_REGEXP_NOTDECIMAL:
2819 neg = !neg;
2820 case XML_REGEXP_DECIMAL:
2821 ret = xmlUCSIsCatNd(codepoint);
2822 break;
2823 case XML_REGEXP_REALCHAR:
2824 neg = !neg;
2825 case XML_REGEXP_NOTREALCHAR:
2826 ret = xmlUCSIsCatP(codepoint);
2827 if (ret == 0)
2828 ret = xmlUCSIsCatZ(codepoint);
2829 if (ret == 0)
2830 ret = xmlUCSIsCatC(codepoint);
2831 break;
2832 case XML_REGEXP_LETTER:
2833 ret = xmlUCSIsCatL(codepoint);
2834 break;
2835 case XML_REGEXP_LETTER_UPPERCASE:
2836 ret = xmlUCSIsCatLu(codepoint);
2837 break;
2838 case XML_REGEXP_LETTER_LOWERCASE:
2839 ret = xmlUCSIsCatLl(codepoint);
2840 break;
2841 case XML_REGEXP_LETTER_TITLECASE:
2842 ret = xmlUCSIsCatLt(codepoint);
2843 break;
2844 case XML_REGEXP_LETTER_MODIFIER:
2845 ret = xmlUCSIsCatLm(codepoint);
2846 break;
2847 case XML_REGEXP_LETTER_OTHERS:
2848 ret = xmlUCSIsCatLo(codepoint);
2849 break;
2850 case XML_REGEXP_MARK:
2851 ret = xmlUCSIsCatM(codepoint);
2852 break;
2853 case XML_REGEXP_MARK_NONSPACING:
2854 ret = xmlUCSIsCatMn(codepoint);
2855 break;
2856 case XML_REGEXP_MARK_SPACECOMBINING:
2857 ret = xmlUCSIsCatMc(codepoint);
2858 break;
2859 case XML_REGEXP_MARK_ENCLOSING:
2860 ret = xmlUCSIsCatMe(codepoint);
2861 break;
2862 case XML_REGEXP_NUMBER:
2863 ret = xmlUCSIsCatN(codepoint);
2864 break;
2865 case XML_REGEXP_NUMBER_DECIMAL:
2866 ret = xmlUCSIsCatNd(codepoint);
2867 break;
2868 case XML_REGEXP_NUMBER_LETTER:
2869 ret = xmlUCSIsCatNl(codepoint);
2870 break;
2871 case XML_REGEXP_NUMBER_OTHERS:
2872 ret = xmlUCSIsCatNo(codepoint);
2873 break;
2874 case XML_REGEXP_PUNCT:
2875 ret = xmlUCSIsCatP(codepoint);
2876 break;
2877 case XML_REGEXP_PUNCT_CONNECTOR:
2878 ret = xmlUCSIsCatPc(codepoint);
2879 break;
2880 case XML_REGEXP_PUNCT_DASH:
2881 ret = xmlUCSIsCatPd(codepoint);
2882 break;
2883 case XML_REGEXP_PUNCT_OPEN:
2884 ret = xmlUCSIsCatPs(codepoint);
2885 break;
2886 case XML_REGEXP_PUNCT_CLOSE:
2887 ret = xmlUCSIsCatPe(codepoint);
2888 break;
2889 case XML_REGEXP_PUNCT_INITQUOTE:
2890 ret = xmlUCSIsCatPi(codepoint);
2891 break;
2892 case XML_REGEXP_PUNCT_FINQUOTE:
2893 ret = xmlUCSIsCatPf(codepoint);
2894 break;
2895 case XML_REGEXP_PUNCT_OTHERS:
2896 ret = xmlUCSIsCatPo(codepoint);
2897 break;
2898 case XML_REGEXP_SEPAR:
2899 ret = xmlUCSIsCatZ(codepoint);
2900 break;
2901 case XML_REGEXP_SEPAR_SPACE:
2902 ret = xmlUCSIsCatZs(codepoint);
2903 break;
2904 case XML_REGEXP_SEPAR_LINE:
2905 ret = xmlUCSIsCatZl(codepoint);
2906 break;
2907 case XML_REGEXP_SEPAR_PARA:
2908 ret = xmlUCSIsCatZp(codepoint);
2909 break;
2910 case XML_REGEXP_SYMBOL:
2911 ret = xmlUCSIsCatS(codepoint);
2912 break;
2913 case XML_REGEXP_SYMBOL_MATH:
2914 ret = xmlUCSIsCatSm(codepoint);
2915 break;
2916 case XML_REGEXP_SYMBOL_CURRENCY:
2917 ret = xmlUCSIsCatSc(codepoint);
2918 break;
2919 case XML_REGEXP_SYMBOL_MODIFIER:
2920 ret = xmlUCSIsCatSk(codepoint);
2921 break;
2922 case XML_REGEXP_SYMBOL_OTHERS:
2923 ret = xmlUCSIsCatSo(codepoint);
2924 break;
2925 case XML_REGEXP_OTHER:
2926 ret = xmlUCSIsCatC(codepoint);
2927 break;
2928 case XML_REGEXP_OTHER_CONTROL:
2929 ret = xmlUCSIsCatCc(codepoint);
2930 break;
2931 case XML_REGEXP_OTHER_FORMAT:
2932 ret = xmlUCSIsCatCf(codepoint);
2933 break;
2934 case XML_REGEXP_OTHER_PRIVATE:
2935 ret = xmlUCSIsCatCo(codepoint);
2936 break;
2937 case XML_REGEXP_OTHER_NA:
2938 /* ret = xmlUCSIsCatCn(codepoint); */
2939 /* Seems it doesn't exist anymore in recent Unicode releases */
2940 ret = 0;
2941 break;
2942 case XML_REGEXP_BLOCK_NAME:
2943 ret = xmlUCSIsBlock(codepoint, (const char *) blockName);
2944 break;
2945 }
2946 if (neg)
2947 return(!ret);
2948 return(ret);
2949 }
2950
2951 static int
2952 xmlRegCheckCharacter(xmlRegAtomPtr atom, int codepoint) {
2953 int i, ret = 0;
2954 xmlRegRangePtr range;
2955
2956 if ((atom == NULL) || (!IS_CHAR(codepoint)))
2957 return(-1);
2958
2959 switch (atom->type) {
2960 case XML_REGEXP_SUBREG:
2961 case XML_REGEXP_EPSILON:
2962 return(-1);
2963 case XML_REGEXP_CHARVAL:
2964 return(codepoint == atom->codepoint);
2965 case XML_REGEXP_RANGES: {
2966 int accept = 0;
2967
2968 for (i = 0;i < atom->nbRanges;i++) {
2969 range = atom->ranges[i];
2970 if (range->neg == 2) {
2971 ret = xmlRegCheckCharacterRange(range->type, codepoint,
2972 0, range->start, range->end,
2973 range->blockName);
2974 if (ret != 0)
2975 return(0); /* excluded char */
2976 } else if (range->neg) {
2977 ret = xmlRegCheckCharacterRange(range->type, codepoint,
2978 0, range->start, range->end,
2979 range->blockName);
2980 if (ret == 0)
2981 accept = 1;
2982 else
2983 return(0);
2984 } else {
2985 ret = xmlRegCheckCharacterRange(range->type, codepoint,
2986 0, range->start, range->end,
2987 range->blockName);
2988 if (ret != 0)
2989 accept = 1; /* might still be excluded */
2990 }
2991 }
2992 return(accept);
2993 }
2994 case XML_REGEXP_STRING:
2995 printf("TODO: XML_REGEXP_STRING\n");
2996 return(-1);
2997 case XML_REGEXP_ANYCHAR:
2998 case XML_REGEXP_ANYSPACE:
2999 case XML_REGEXP_NOTSPACE:
3000 case XML_REGEXP_INITNAME:
3001 case XML_REGEXP_NOTINITNAME:
3002 case XML_REGEXP_NAMECHAR:
3003 case XML_REGEXP_NOTNAMECHAR:
3004 case XML_REGEXP_DECIMAL:
3005 case XML_REGEXP_NOTDECIMAL:
3006 case XML_REGEXP_REALCHAR:
3007 case XML_REGEXP_NOTREALCHAR:
3008 case XML_REGEXP_LETTER:
3009 case XML_REGEXP_LETTER_UPPERCASE:
3010 case XML_REGEXP_LETTER_LOWERCASE:
3011 case XML_REGEXP_LETTER_TITLECASE:
3012 case XML_REGEXP_LETTER_MODIFIER:
3013 case XML_REGEXP_LETTER_OTHERS:
3014 case XML_REGEXP_MARK:
3015 case XML_REGEXP_MARK_NONSPACING:
3016 case XML_REGEXP_MARK_SPACECOMBINING:
3017 case XML_REGEXP_MARK_ENCLOSING:
3018 case XML_REGEXP_NUMBER:
3019 case XML_REGEXP_NUMBER_DECIMAL:
3020 case XML_REGEXP_NUMBER_LETTER:
3021 case XML_REGEXP_NUMBER_OTHERS:
3022 case XML_REGEXP_PUNCT:
3023 case XML_REGEXP_PUNCT_CONNECTOR:
3024 case XML_REGEXP_PUNCT_DASH:
3025 case XML_REGEXP_PUNCT_OPEN:
3026 case XML_REGEXP_PUNCT_CLOSE:
3027 case XML_REGEXP_PUNCT_INITQUOTE:
3028 case XML_REGEXP_PUNCT_FINQUOTE:
3029 case XML_REGEXP_PUNCT_OTHERS:
3030 case XML_REGEXP_SEPAR:
3031 case XML_REGEXP_SEPAR_SPACE:
3032 case XML_REGEXP_SEPAR_LINE:
3033 case XML_REGEXP_SEPAR_PARA:
3034 case XML_REGEXP_SYMBOL:
3035 case XML_REGEXP_SYMBOL_MATH:
3036 case XML_REGEXP_SYMBOL_CURRENCY:
3037 case XML_REGEXP_SYMBOL_MODIFIER:
3038 case XML_REGEXP_SYMBOL_OTHERS:
3039 case XML_REGEXP_OTHER:
3040 case XML_REGEXP_OTHER_CONTROL:
3041 case XML_REGEXP_OTHER_FORMAT:
3042 case XML_REGEXP_OTHER_PRIVATE:
3043 case XML_REGEXP_OTHER_NA:
3044 case XML_REGEXP_BLOCK_NAME:
3045 ret = xmlRegCheckCharacterRange(atom->type, codepoint, 0, 0, 0,
3046 (const xmlChar *)atom->valuep);
3047 if (atom->neg)
3048 ret = !ret;
3049 break;
3050 }
3051 return(ret);
3052 }
3053
3054 /************************************************************************
3055 * *
3056 * Saving and restoring state of an execution context *
3057 * *
3058 ************************************************************************/
3059
3060 #ifdef DEBUG_REGEXP_EXEC
3061 static void
3062 xmlFARegDebugExec(xmlRegExecCtxtPtr exec) {
3063 printf("state: %d:%d:idx %d", exec->state->no, exec->transno, exec->index);
3064 if (exec->inputStack != NULL) {
3065 int i;
3066 printf(": ");
3067 for (i = 0;(i < 3) && (i < exec->inputStackNr);i++)
3068 printf("%s ", (const char *)
3069 exec->inputStack[exec->inputStackNr - (i + 1)].value);
3070 } else {
3071 printf(": %s", &(exec->inputString[exec->index]));
3072 }
3073 printf("\n");
3074 }
3075 #endif
3076
3077 static void
3078 xmlFARegExecSave(xmlRegExecCtxtPtr exec) {
3079 #ifdef DEBUG_REGEXP_EXEC
3080 printf("saving ");
3081 exec->transno++;
3082 xmlFARegDebugExec(exec);
3083 exec->transno--;
3084 #endif
3085 #ifdef MAX_PUSH
3086 if (exec->nbPush > MAX_PUSH) {
3087 return;
3088 }
3089 exec->nbPush++;
3090 #endif
3091
3092 if (exec->maxRollbacks == 0) {
3093 exec->maxRollbacks = 4;
3094 exec->rollbacks = (xmlRegExecRollback *) xmlMalloc(exec->maxRollbacks *
3095 sizeof(xmlRegExecRollback));
3096 if (exec->rollbacks == NULL) {
3097 xmlRegexpErrMemory(NULL, "saving regexp");
3098 exec->maxRollbacks = 0;
3099 return;
3100 }
3101 memset(exec->rollbacks, 0,
3102 exec->maxRollbacks * sizeof(xmlRegExecRollback));
3103 } else if (exec->nbRollbacks >= exec->maxRollbacks) {
3104 xmlRegExecRollback *tmp;
3105 int len = exec->maxRollbacks;
3106
3107 exec->maxRollbacks *= 2;
3108 tmp = (xmlRegExecRollback *) xmlRealloc(exec->rollbacks,
3109 exec->maxRollbacks * sizeof(xmlRegExecRollback));
3110 if (tmp == NULL) {
3111 xmlRegexpErrMemory(NULL, "saving regexp");
3112 exec->maxRollbacks /= 2;
3113 return;
3114 }
3115 exec->rollbacks = tmp;
3116 tmp = &exec->rollbacks[len];
3117 memset(tmp, 0, (exec->maxRollbacks - len) * sizeof(xmlRegExecRollback));
3118 }
3119 exec->rollbacks[exec->nbRollbacks].state = exec->state;
3120 exec->rollbacks[exec->nbRollbacks].index = exec->index;
3121 exec->rollbacks[exec->nbRollbacks].nextbranch = exec->transno + 1;
3122 if (exec->comp->nbCounters > 0) {
3123 if (exec->rollbacks[exec->nbRollbacks].counts == NULL) {
3124 exec->rollbacks[exec->nbRollbacks].counts = (int *)
3125 xmlMalloc(exec->comp->nbCounters * sizeof(int));
3126 if (exec->rollbacks[exec->nbRollbacks].counts == NULL) {
3127 xmlRegexpErrMemory(NULL, "saving regexp");
3128 exec->status = -5;
3129 return;
3130 }
3131 }
3132 memcpy(exec->rollbacks[exec->nbRollbacks].counts, exec->counts,
3133 exec->comp->nbCounters * sizeof(int));
3134 }
3135 exec->nbRollbacks++;
3136 }
3137
3138 static void
3139 xmlFARegExecRollBack(xmlRegExecCtxtPtr exec) {
3140 if (exec->nbRollbacks <= 0) {
3141 exec->status = -1;
3142 #ifdef DEBUG_REGEXP_EXEC
3143 printf("rollback failed on empty stack\n");
3144 #endif
3145 return;
3146 }
3147 exec->nbRollbacks--;
3148 exec->state = exec->rollbacks[exec->nbRollbacks].state;
3149 exec->index = exec->rollbacks[exec->nbRollbacks].index;
3150 exec->transno = exec->rollbacks[exec->nbRollbacks].nextbranch;
3151 if (exec->comp->nbCounters > 0) {
3152 if (exec->rollbacks[exec->nbRollbacks].counts == NULL) {
3153 fprintf(stderr, "exec save: allocation failed");
3154 exec->status = -6;
3155 return;
3156 }
3157 memcpy(exec->counts, exec->rollbacks[exec->nbRollbacks].counts,
3158 exec->comp->nbCounters * sizeof(int));
3159 }
3160
3161 #ifdef DEBUG_REGEXP_EXEC
3162 printf("restored ");
3163 xmlFARegDebugExec(exec);
3164 #endif
3165 }
3166
3167 /************************************************************************
3168 * *
3169 * Verifier, running an input against a compiled regexp *
3170 * *
3171 ************************************************************************/
3172
3173 static int
3174 xmlFARegExec(xmlRegexpPtr comp, const xmlChar *content) {
3175 xmlRegExecCtxt execval;
3176 xmlRegExecCtxtPtr exec = &execval;
3177 int ret, codepoint = 0, len, deter;
3178
3179 exec->inputString = content;
3180 exec->index = 0;
3181 exec->nbPush = 0;
3182 exec->determinist = 1;
3183 exec->maxRollbacks = 0;
3184 exec->nbRollbacks = 0;
3185 exec->rollbacks = NULL;
3186 exec->status = 0;
3187 exec->comp = comp;
3188 exec->state = comp->states[0];
3189 exec->transno = 0;
3190 exec->transcount = 0;
3191 exec->inputStack = NULL;
3192 exec->inputStackMax = 0;
3193 if (comp->nbCounters > 0) {
3194 exec->counts = (int *) xmlMalloc(comp->nbCounters * sizeof(int));
3195 if (exec->counts == NULL) {
3196 xmlRegexpErrMemory(NULL, "running regexp");
3197 return(-1);
3198 }
3199 memset(exec->counts, 0, comp->nbCounters * sizeof(int));
3200 } else
3201 exec->counts = NULL;
3202 while ((exec->status == 0) &&
3203 ((exec->inputString[exec->index] != 0) ||
3204 ((exec->state != NULL) &&
3205 (exec->state->type != XML_REGEXP_FINAL_STATE)))) {
3206 xmlRegTransPtr trans;
3207 xmlRegAtomPtr atom;
3208
3209 /*
3210 * If end of input on non-terminal state, rollback, however we may
3211 * still have epsilon like transition for counted transitions
3212 * on counters, in that case don't break too early. Additionally,
3213 * if we are working on a range like "AB{0,2}", where B is not present,
3214 * we don't want to break.
3215 */
3216 len = 1;
3217 if ((exec->inputString[exec->index] == 0) && (exec->counts == NULL)) {
3218 /*
3219 * if there is a transition, we must check if
3220 * atom allows minOccurs of 0
3221 */
3222 if (exec->transno < exec->state->nbTrans) {
3223 trans = &exec->state->trans[exec->transno];
3224 if (trans->to >=0) {
3225 atom = trans->atom;
3226 if (!((atom->min == 0) && (atom->max > 0)))
3227 goto rollback;
3228 }
3229 } else
3230 goto rollback;
3231 }
3232
3233 exec->transcount = 0;
3234 for (;exec->transno < exec->state->nbTrans;exec->transno++) {
3235 trans = &exec->state->trans[exec->transno];
3236 if (trans->to < 0)
3237 continue;
3238 atom = trans->atom;
3239 ret = 0;
3240 deter = 1;
3241 if (trans->count >= 0) {
3242 int count;
3243 xmlRegCounterPtr counter;
3244
3245 if (exec->counts == NULL) {
3246 exec->status = -1;
3247 goto error;
3248 }
3249 /*
3250 * A counted transition.
3251 */
3252
3253 count = exec->counts[trans->count];
3254 counter = &exec->comp->counters[trans->count];
3255 #ifdef DEBUG_REGEXP_EXEC
3256 printf("testing count %d: val %d, min %d, max %d\n",
3257 trans->count, count, counter->min, counter->max);
3258 #endif
3259 ret = ((count >= counter->min) && (count <= counter->max));
3260 if ((ret) && (counter->min != counter->max))
3261 deter = 0;
3262 } else if (atom == NULL) {
3263 fprintf(stderr, "epsilon transition left at runtime\n");
3264 exec->status = -2;
3265 break;
3266 } else if (exec->inputString[exec->index] != 0) {
3267 codepoint = CUR_SCHAR(&(exec->inputString[exec->index]), len);
3268 ret = xmlRegCheckCharacter(atom, codepoint);
3269 if ((ret == 1) && (atom->min >= 0) && (atom->max > 0)) {
3270 xmlRegStatePtr to = comp->states[trans->to];
3271
3272 /*
3273 * this is a multiple input sequence
3274 * If there is a counter associated increment it now.
3275 * before potentially saving and rollback
3276 * do not increment if the counter is already over the
3277 * maximum limit in which case get to next transition
3278 */
3279 if (trans->counter >= 0) {
3280 xmlRegCounterPtr counter;
3281
3282 if ((exec->counts == NULL) ||
3283 (exec->comp == NULL) ||
3284 (exec->comp->counters == NULL)) {
3285 exec->status = -1;
3286 goto error;
3287 }
3288 counter = &exec->comp->counters[trans->counter];
3289 if (exec->counts[trans->counter] >= counter->max)
3290 continue; /* for loop on transitions */
3291
3292 #ifdef DEBUG_REGEXP_EXEC
3293 printf("Increasing count %d\n", trans->counter);
3294 #endif
3295 exec->counts[trans->counter]++;
3296 }
3297 if (exec->state->nbTrans > exec->transno + 1) {
3298 xmlFARegExecSave(exec);
3299 }
3300 exec->transcount = 1;
3301 do {
3302 /*
3303 * Try to progress as much as possible on the input
3304 */
3305 if (exec->transcount == atom->max) {
3306 break;
3307 }
3308 exec->index += len;
3309 /*
3310 * End of input: stop here
3311 */
3312 if (exec->inputString[exec->index] == 0) {
3313 exec->index -= len;
3314 break;
3315 }
3316 if (exec->transcount >= atom->min) {
3317 int transno = exec->transno;
3318 xmlRegStatePtr state = exec->state;
3319
3320 /*
3321 * The transition is acceptable save it
3322 */
3323 exec->transno = -1; /* trick */
3324 exec->state = to;
3325 xmlFARegExecSave(exec);
3326 exec->transno = transno;
3327 exec->state = state;
3328 }
3329 codepoint = CUR_SCHAR(&(exec->inputString[exec->index]),
3330 len);
3331 ret = xmlRegCheckCharacter(atom, codepoint);
3332 exec->transcount++;
3333 } while (ret == 1);
3334 if (exec->transcount < atom->min)
3335 ret = 0;
3336
3337 /*
3338 * If the last check failed but one transition was found
3339 * possible, rollback
3340 */
3341 if (ret < 0)
3342 ret = 0;
3343 if (ret == 0) {
3344 goto rollback;
3345 }
3346 if (trans->counter >= 0) {
3347 if (exec->counts == NULL) {
3348 exec->status = -1;
3349 goto error;
3350 }
3351 #ifdef DEBUG_REGEXP_EXEC
3352 printf("Decreasing count %d\n", trans->counter);
3353 #endif
3354 exec->counts[trans->counter]--;
3355 }
3356 } else if ((ret == 0) && (atom->min == 0) && (atom->max > 0)) {
3357 /*
3358 * we don't match on the codepoint, but minOccurs of 0
3359 * says that's ok. Setting len to 0 inhibits stepping
3360 * over the codepoint.
3361 */
3362 exec->transcount = 1;
3363 len = 0;
3364 ret = 1;
3365 }
3366 } else if ((atom->min == 0) && (atom->max > 0)) {
3367 /* another spot to match when minOccurs is 0 */
3368 exec->transcount = 1;
3369 len = 0;
3370 ret = 1;
3371 }
3372 if (ret == 1) {
3373 if ((trans->nd == 1) ||
3374 ((trans->count >= 0) && (deter == 0) &&
3375 (exec->state->nbTrans > exec->transno + 1))) {
3376 #ifdef DEBUG_REGEXP_EXEC
3377 if (trans->nd == 1)
3378 printf("Saving on nd transition atom %d for %c at %d\n",
3379 trans->atom->no, codepoint, exec->index);
3380 else
3381 printf("Saving on counted transition count %d for %c at %d\n",
3382 trans->count, codepoint, exec->index);
3383 #endif
3384 xmlFARegExecSave(exec);
3385 }
3386 if (trans->counter >= 0) {
3387 xmlRegCounterPtr counter;
3388
3389 /* make sure we don't go over the counter maximum value */
3390 if ((exec->counts == NULL) ||
3391 (exec->comp == NULL) ||
3392 (exec->comp->counters == NULL)) {
3393 exec->status = -1;
3394 goto error;
3395 }
3396 counter = &exec->comp->counters[trans->counter];
3397 if (exec->counts[trans->counter] >= counter->max)
3398 continue; /* for loop on transitions */
3399 #ifdef DEBUG_REGEXP_EXEC
3400 printf("Increasing count %d\n", trans->counter);
3401 #endif
3402 exec->counts[trans->counter]++;
3403 }
3404 if ((trans->count >= 0) &&
3405 (trans->count < REGEXP_ALL_COUNTER)) {
3406 if (exec->counts == NULL) {
3407 exec->status = -1;
3408 goto error;
3409 }
3410 #ifdef DEBUG_REGEXP_EXEC
3411 printf("resetting count %d on transition\n",
3412 trans->count);
3413 #endif
3414 exec->counts[trans->count] = 0;
3415 }
3416 #ifdef DEBUG_REGEXP_EXEC
3417 printf("entering state %d\n", trans->to);
3418 #endif
3419 exec->state = comp->states[trans->to];
3420 exec->transno = 0;
3421 if (trans->atom != NULL) {
3422 exec->index += len;
3423 }
3424 goto progress;
3425 } else if (ret < 0) {
3426 exec->status = -4;
3427 break;
3428 }
3429 }
3430 if ((exec->transno != 0) || (exec->state->nbTrans == 0)) {
3431 rollback:
3432 /*
3433 * Failed to find a way out
3434 */
3435 exec->determinist = 0;
3436 #ifdef DEBUG_REGEXP_EXEC
3437 printf("rollback from state %d on %d:%c\n", exec->state->no,
3438 codepoint,codepoint);
3439 #endif
3440 xmlFARegExecRollBack(exec);
3441 }
3442 progress:
3443 continue;
3444 }
3445 error:
3446 if (exec->rollbacks != NULL) {
3447 if (exec->counts != NULL) {
3448 int i;
3449
3450 for (i = 0;i < exec->maxRollbacks;i++)
3451 if (exec->rollbacks[i].counts != NULL)
3452 xmlFree(exec->rollbacks[i].counts);
3453 }
3454 xmlFree(exec->rollbacks);
3455 }
3456 if (exec->counts != NULL)
3457 xmlFree(exec->counts);
3458 if (exec->status == 0)
3459 return(1);
3460 if (exec->status == -1) {
3461 if (exec->nbPush > MAX_PUSH)
3462 return(-1);
3463 return(0);
3464 }
3465 return(exec->status);
3466 }
3467
3468 /************************************************************************
3469 * *
3470 * Progressive interface to the verifier one atom at a time *
3471 * *
3472 ************************************************************************/
3473 #ifdef DEBUG_ERR
3474 static void testerr(xmlRegExecCtxtPtr exec);
3475 #endif
3476
3477 /**
3478 * xmlRegNewExecCtxt:
3479 * @comp: a precompiled regular expression
3480 * @callback: a callback function used for handling progresses in the
3481 * automata matching phase
3482 * @data: the context data associated to the callback in this context
3483 *
3484 * Build a context used for progressive evaluation of a regexp.
3485 *
3486 * Returns the new context
3487 */
3488 xmlRegExecCtxtPtr
3489 xmlRegNewExecCtxt(xmlRegexpPtr comp, xmlRegExecCallbacks callback, void *data) {
3490 xmlRegExecCtxtPtr exec;
3491
3492 if (comp == NULL)
3493 return(NULL);
3494 if ((comp->compact == NULL) && (comp->states == NULL))
3495 return(NULL);
3496 exec = (xmlRegExecCtxtPtr) xmlMalloc(sizeof(xmlRegExecCtxt));
3497 if (exec == NULL) {
3498 xmlRegexpErrMemory(NULL, "creating execution context");
3499 return(NULL);
3500 }
3501 memset(exec, 0, sizeof(xmlRegExecCtxt));
3502 exec->inputString = NULL;
3503 exec->index = 0;
3504 exec->determinist = 1;
3505 exec->maxRollbacks = 0;
3506 exec->nbRollbacks = 0;
3507 exec->rollbacks = NULL;
3508 exec->status = 0;
3509 exec->comp = comp;
3510 if (comp->compact == NULL)
3511 exec->state = comp->states[0];
3512 exec->transno = 0;
3513 exec->transcount = 0;
3514 exec->callback = callback;
3515 exec->data = data;
3516 if (comp->nbCounters > 0) {
3517 /*
3518 * For error handling, exec->counts is allocated twice the size
3519 * the second half is used to store the data in case of rollback
3520 */
3521 exec->counts = (int *) xmlMalloc(comp->nbCounters * sizeof(int)
3522 * 2);
3523 if (exec->counts == NULL) {
3524 xmlRegexpErrMemory(NULL, "creating execution context");
3525 xmlFree(exec);
3526 return(NULL);
3527 }
3528 memset(exec->counts, 0, comp->nbCounters * sizeof(int) * 2);
3529 exec->errCounts = &exec->counts[comp->nbCounters];
3530 } else {
3531 exec->counts = NULL;
3532 exec->errCounts = NULL;
3533 }
3534 exec->inputStackMax = 0;
3535 exec->inputStackNr = 0;
3536 exec->inputStack = NULL;
3537 exec->errStateNo = -1;
3538 exec->errString = NULL;
3539 exec->nbPush = 0;
3540 return(exec);
3541 }
3542
3543 /**
3544 * xmlRegFreeExecCtxt:
3545 * @exec: a regular expression evaulation context
3546 *
3547 * Free the structures associated to a regular expression evaulation context.
3548 */
3549 void
3550 xmlRegFreeExecCtxt(xmlRegExecCtxtPtr exec) {
3551 if (exec == NULL)
3552 return;
3553
3554 if (exec->rollbacks != NULL) {
3555 if (exec->counts != NULL) {
3556 int i;
3557
3558 for (i = 0;i < exec->maxRollbacks;i++)
3559 if (exec->rollbacks[i].counts != NULL)
3560 xmlFree(exec->rollbacks[i].counts);
3561 }
3562 xmlFree(exec->rollbacks);
3563 }
3564 if (exec->counts != NULL)
3565 xmlFree(exec->counts);
3566 if (exec->inputStack != NULL) {
3567 int i;
3568
3569 for (i = 0;i < exec->inputStackNr;i++) {
3570 if (exec->inputStack[i].value != NULL)
3571 xmlFree(exec->inputStack[i].value);
3572 }
3573 xmlFree(exec->inputStack);
3574 }
3575 if (exec->errString != NULL)
3576 xmlFree(exec->errString);
3577 xmlFree(exec);
3578 }
3579
3580 static void
3581 xmlFARegExecSaveInputString(xmlRegExecCtxtPtr exec, const xmlChar *value,
3582 void *data) {
3583 #ifdef DEBUG_PUSH
3584 printf("saving value: %d:%s\n", exec->inputStackNr, value);
3585 #endif
3586 if (exec->inputStackMax == 0) {
3587 exec->inputStackMax = 4;
3588 exec->inputStack = (xmlRegInputTokenPtr)
3589 xmlMalloc(exec->inputStackMax * sizeof(xmlRegInputToken));
3590 if (exec->inputStack == NULL) {
3591 xmlRegexpErrMemory(NULL, "pushing input string");
3592 exec->inputStackMax = 0;
3593 return;
3594 }
3595 } else if (exec->inputStackNr + 1 >= exec->inputStackMax) {
3596 xmlRegInputTokenPtr tmp;
3597
3598 exec->inputStackMax *= 2;
3599 tmp = (xmlRegInputTokenPtr) xmlRealloc(exec->inputStack,
3600 exec->inputStackMax * sizeof(xmlRegInputToken));
3601 if (tmp == NULL) {
3602 xmlRegexpErrMemory(NULL, "pushing input string");
3603 exec->inputStackMax /= 2;
3604 return;
3605 }
3606 exec->inputStack = tmp;
3607 }
3608 exec->inputStack[exec->inputStackNr].value = xmlStrdup(value);
3609 exec->inputStack[exec->inputStackNr].data = data;
3610 exec->inputStackNr++;
3611 exec->inputStack[exec->inputStackNr].value = NULL;
3612 exec->inputStack[exec->inputStackNr].data = NULL;
3613 }
3614
3615 /**
3616 * xmlRegStrEqualWildcard:
3617 * @expStr: the string to be evaluated
3618 * @valStr: the validation string
3619 *
3620 * Checks if both strings are equal or have the same content. "*"
3621 * can be used as a wildcard in @valStr; "|" is used as a seperator of
3622 * substrings in both @expStr and @valStr.
3623 *
3624 * Returns 1 if the comparison is satisfied and the number of substrings
3625 * is equal, 0 otherwise.
3626 */
3627
3628 static int
3629 xmlRegStrEqualWildcard(const xmlChar *expStr, const xmlChar *valStr) {
3630 if (expStr == valStr) return(1);
3631 if (expStr == NULL) return(0);
3632 if (valStr == NULL) return(0);
3633 do {
3634 /*
3635 * Eval if we have a wildcard for the current item.
3636 */
3637 if (*expStr != *valStr) {
3638 /* if one of them starts with a wildcard make valStr be it */
3639 if (*valStr == '*') {
3640 const xmlChar *tmp;
3641
3642 tmp = valStr;
3643 valStr = expStr;
3644 expStr = tmp;
3645 }
3646 if ((*valStr != 0) && (*expStr != 0) && (*expStr++ == '*')) {
3647 do {
3648 if (*valStr == XML_REG_STRING_SEPARATOR)
3649 break;
3650 valStr++;
3651 } while (*valStr != 0);
3652 continue;
3653 } else
3654 return(0);
3655 }
3656 expStr++;
3657 valStr++;
3658 } while (*valStr != 0);
3659 if (*expStr != 0)
3660 return (0);
3661 else
3662 return (1);
3663 }
3664
3665 /**
3666 * xmlRegCompactPushString:
3667 * @exec: a regexp execution context
3668 * @comp: the precompiled exec with a compact table
3669 * @value: a string token input
3670 * @data: data associated to the token to reuse in callbacks
3671 *
3672 * Push one input token in the execution context
3673 *
3674 * Returns: 1 if the regexp reached a final state, 0 if non-final, and
3675 * a negative value in case of error.
3676 */
3677 static int
3678 xmlRegCompactPushString(xmlRegExecCtxtPtr exec,
3679 xmlRegexpPtr comp,
3680 const xmlChar *value,
3681 void *data) {
3682 int state = exec->index;
3683 int i, target;
3684
3685 if ((comp == NULL) || (comp->compact == NULL) || (comp->stringMap == NULL))
3686 return(-1);
3687
3688 if (value == NULL) {
3689 /*
3690 * are we at a final state ?
3691 */
3692 if (comp->compact[state * (comp->nbstrings + 1)] ==
3693 XML_REGEXP_FINAL_STATE)
3694 return(1);
3695 return(0);
3696 }
3697
3698 #ifdef DEBUG_PUSH
3699 printf("value pushed: %s\n", value);
3700 #endif
3701
3702 /*
3703 * Examine all outside transitions from current state
3704 */
3705 for (i = 0;i < comp->nbstrings;i++) {
3706 target = comp->compact[state * (comp->nbstrings + 1) + i + 1];
3707 if ((target > 0) && (target <= comp->nbstates)) {
3708 target--; /* to avoid 0 */
3709 if (xmlRegStrEqualWildcard(comp->stringMap[i], value)) {
3710 exec->index = target;
3711 if ((exec->callback != NULL) && (comp->transdata != NULL)) {
3712 exec->callback(exec->data, value,
3713 comp->transdata[state * comp->nbstrings + i], data);
3714 }
3715 #ifdef DEBUG_PUSH
3716 printf("entering state %d\n", target);
3717 #endif
3718 if (comp->compact[target * (comp->nbstrings + 1)] ==
3719 XML_REGEXP_SINK_STATE)
3720 goto error;
3721
3722 if (comp->compact[target * (comp->nbstrings + 1)] ==
3723 XML_REGEXP_FINAL_STATE)
3724 return(1);
3725 return(0);
3726 }
3727 }
3728 }
3729 /*
3730 * Failed to find an exit transition out from current state for the
3731 * current token
3732 */
3733 #ifdef DEBUG_PUSH
3734 printf("failed to find a transition for %s on state %d\n", value, state);
3735 #endif
3736 error:
3737 if (exec->errString != NULL)
3738 xmlFree(exec->errString);
3739 exec->errString = xmlStrdup(value);
3740 exec->errStateNo = state;
3741 exec->status = -1;
3742 #ifdef DEBUG_ERR
3743 testerr(exec);
3744 #endif
3745 return(-1);
3746 }
3747
3748 /**
3749 * xmlRegExecPushStringInternal:
3750 * @exec: a regexp execution context or NULL to indicate the end
3751 * @value: a string token input
3752 * @data: data associated to the token to reuse in callbacks
3753 * @compound: value was assembled from 2 strings
3754 *
3755 * Push one input token in the execution context
3756 *
3757 * Returns: 1 if the regexp reached a final state, 0 if non-final, and
3758 * a negative value in case of error.
3759 */
3760 static int
3761 xmlRegExecPushStringInternal(xmlRegExecCtxtPtr exec, const xmlChar *value,
3762 void *data, int compound) {
3763 xmlRegTransPtr trans;
3764 xmlRegAtomPtr atom;
3765 int ret;
3766 int final = 0;
3767 int progress = 1;
3768
3769 if (exec == NULL)
3770 return(-1);
3771 if (exec->comp == NULL)
3772 return(-1);
3773 if (exec->status != 0)
3774 return(exec->status);
3775
3776 if (exec->comp->compact != NULL)
3777 return(xmlRegCompactPushString(exec, exec->comp, value, data));
3778
3779 if (value == NULL) {
3780 if (exec->state->type == XML_REGEXP_FINAL_STATE)
3781 return(1);
3782 final = 1;
3783 }
3784
3785 #ifdef DEBUG_PUSH
3786 printf("value pushed: %s\n", value);
3787 #endif
3788 /*
3789 * If we have an active rollback stack push the new value there
3790 * and get back to where we were left
3791 */
3792 if ((value != NULL) && (exec->inputStackNr > 0)) {
3793 xmlFARegExecSaveInputString(exec, value, data);
3794 value = exec->inputStack[exec->index].value;
3795 data = exec->inputStack[exec->index].data;
3796 #ifdef DEBUG_PUSH
3797 printf("value loaded: %s\n", value);
3798 #endif
3799 }
3800
3801 while ((exec->status == 0) &&
3802 ((value != NULL) ||
3803 ((final == 1) &&
3804 (exec->state->type != XML_REGEXP_FINAL_STATE)))) {
3805
3806 /*
3807 * End of input on non-terminal state, rollback, however we may
3808 * still have epsilon like transition for counted transitions
3809 * on counters, in that case don't break too early.
3810 */
3811 if ((value == NULL) && (exec->counts == NULL))
3812 goto rollback;
3813
3814 exec->transcount = 0;
3815 for (;exec->transno < exec->state->nbTrans;exec->transno++) {
3816 trans = &exec->state->trans[exec->transno];
3817 if (trans->to < 0)
3818 continue;
3819 atom = trans->atom;
3820 ret = 0;
3821 if (trans->count == REGEXP_ALL_LAX_COUNTER) {
3822 int i;
3823 int count;
3824 xmlRegTransPtr t;
3825 xmlRegCounterPtr counter;
3826
3827 ret = 0;
3828
3829 #ifdef DEBUG_PUSH
3830 printf("testing all lax %d\n", trans->count);
3831 #endif
3832 /*
3833 * Check all counted transitions from the current state
3834 */
3835 if ((value == NULL) && (final)) {
3836 ret = 1;
3837 } else if (value != NULL) {
3838 for (i = 0;i < exec->state->nbTrans;i++) {
3839 t = &exec->state->trans[i];
3840 if ((t->counter < 0) || (t == trans))
3841 continue;
3842 counter = &exec->comp->counters[t->counter];
3843 count = exec->counts[t->counter];
3844 if ((count < counter->max) &&
3845 (t->atom != NULL) &&
3846 (xmlStrEqual(value, t->atom->valuep))) {
3847 ret = 0;
3848 break;
3849 }
3850 if ((count >= counter->min) &&
3851 (count < counter->max) &&
3852 (t->atom != NULL) &&
3853 (xmlStrEqual(value, t->atom->valuep))) {
3854 ret = 1;
3855 break;
3856 }
3857 }
3858 }
3859 } else if (trans->count == REGEXP_ALL_COUNTER) {
3860 int i;
3861 int count;
3862 xmlRegTransPtr t;
3863 xmlRegCounterPtr counter;
3864
3865 ret = 1;
3866
3867 #ifdef DEBUG_PUSH
3868 printf("testing all %d\n", trans->count);
3869 #endif
3870 /*
3871 * Check all counted transitions from the current state
3872 */
3873 for (i = 0;i < exec->state->nbTrans;i++) {
3874 t = &exec->state->trans[i];
3875 if ((t->counter < 0) || (t == trans))
3876 continue;
3877 counter = &exec->comp->counters[t->counter];
3878 count = exec->counts[t->counter];
3879 if ((count < counter->min) || (count > counter->max)) {
3880 ret = 0;
3881 break;
3882 }
3883 }
3884 } else if (trans->count >= 0) {
3885 int count;
3886 xmlRegCounterPtr counter;
3887
3888 /*
3889 * A counted transition.
3890 */
3891
3892 count = exec->counts[trans->count];
3893 counter = &exec->comp->counters[trans->count];
3894 #ifdef DEBUG_PUSH
3895 printf("testing count %d: val %d, min %d, max %d\n",
3896 trans->count, count, counter->min, counter->max);
3897 #endif
3898 ret = ((count >= counter->min) && (count <= counter->max));
3899 } else if (atom == NULL) {
3900 fprintf(stderr, "epsilon transition left at runtime\n");
3901 exec->status = -2;
3902 break;
3903 } else if (value != NULL) {
3904 ret = xmlRegStrEqualWildcard(atom->valuep, value);
3905 if (atom->neg) {
3906 ret = !ret;
3907 if (!compound)
3908 ret = 0;
3909 }
3910 if ((ret == 1) && (trans->counter >= 0)) {
3911 xmlRegCounterPtr counter;
3912 int count;
3913
3914 count = exec->counts[trans->counter];
3915 counter = &exec->comp->counters[trans->counter];
3916 if (count >= counter->max)
3917 ret = 0;
3918 }
3919
3920 if ((ret == 1) && (atom->min > 0) && (atom->max > 0)) {
3921 xmlRegStatePtr to = exec->comp->states[trans->to];
3922
3923 /*
3924 * this is a multiple input sequence
3925 */
3926 if (exec->state->nbTrans > exec->transno + 1) {
3927 if (exec->inputStackNr <= 0) {
3928 xmlFARegExecSaveInputString(exec, value, data);
3929 }
3930 xmlFARegExecSave(exec);
3931 }
3932 exec->transcount = 1;
3933 do {
3934 /*
3935 * Try to progress as much as possible on the input
3936 */
3937 if (exec->transcount == atom->max) {
3938 break;
3939 }
3940 exec->index++;
3941 value = exec->inputStack[exec->index].value;
3942 data = exec->inputStack[exec->index].data;
3943 #ifdef DEBUG_PUSH
3944 printf("value loaded: %s\n", value);
3945 #endif
3946
3947 /*
3948 * End of input: stop here
3949 */
3950 if (value == NULL) {
3951 exec->index --;
3952 break;
3953 }
3954 if (exec->transcount >= atom->min) {
3955 int transno = exec->transno;
3956 xmlRegStatePtr state = exec->state;
3957
3958 /*
3959 * The transition is acceptable save it
3960 */
3961 exec->transno = -1; /* trick */
3962 exec->state = to;
3963 if (exec->inputStackNr <= 0) {
3964 xmlFARegExecSaveInputString(exec, value, data);
3965 }
3966 xmlFARegExecSave(exec);
3967 exec->transno = transno;
3968 exec->state = state;
3969 }
3970 ret = xmlStrEqual(value, atom->valuep);
3971 exec->transcount++;
3972 } while (ret == 1);
3973 if (exec->transcount < atom->min)
3974 ret = 0;
3975
3976 /*
3977 * If the last check failed but one transition was found
3978 * possible, rollback
3979 */
3980 if (ret < 0)
3981 ret = 0;
3982 if (ret == 0) {
3983 goto rollback;
3984 }
3985 }
3986 }
3987 if (ret == 1) {
3988 if ((exec->callback != NULL) && (atom != NULL) &&
3989 (data != NULL)) {
3990 exec->callback(exec->data, atom->valuep,
3991 atom->data, data);
3992 }
3993 if (exec->state->nbTrans > exec->transno + 1) {
3994 if (exec->inputStackNr <= 0) {
3995 xmlFARegExecSaveInputString(exec, value, data);
3996 }
3997 xmlFARegExecSave(exec);
3998 }
3999 if (trans->counter >= 0) {
4000 #ifdef DEBUG_PUSH
4001 printf("Increasing count %d\n", trans->counter);
4002 #endif
4003 exec->counts[trans->counter]++;
4004 }
4005 if ((trans->count >= 0) &&
4006 (trans->count < REGEXP_ALL_COUNTER)) {
4007 #ifdef DEBUG_REGEXP_EXEC
4008 printf("resetting count %d on transition\n",
4009 trans->count);
4010 #endif
4011 exec->counts[trans->count] = 0;
4012 }
4013 #ifdef DEBUG_PUSH
4014 printf("entering state %d\n", trans->to);
4015 #endif
4016 if ((exec->comp->states[trans->to] != NULL) &&
4017 (exec->comp->states[trans->to]->type ==
4018 XML_REGEXP_SINK_STATE)) {
4019 /*
4020 * entering a sink state, save the current state as error
4021 * state.
4022 */
4023 if (exec->errString != NULL)
4024 xmlFree(exec->errString);
4025 exec->errString = xmlStrdup(value);
4026 exec->errState = exec->state;
4027 memcpy(exec->errCounts, exec->counts,
4028 exec->comp->nbCounters * sizeof(int));
4029 }
4030 exec->state = exec->comp->states[trans->to];
4031 exec->transno = 0;
4032 if (trans->atom != NULL) {
4033 if (exec->inputStack != NULL) {
4034 exec->index++;
4035 if (exec->index < exec->inputStackNr) {
4036 value = exec->inputStack[exec->index].value;
4037 data = exec->inputStack[exec->index].data;
4038 #ifdef DEBUG_PUSH
4039 printf("value loaded: %s\n", value);
4040 #endif
4041 } else {
4042 value = NULL;
4043 data = NULL;
4044 #ifdef DEBUG_PUSH
4045 printf("end of input\n");
4046 #endif
4047 }
4048 } else {
4049 value = NULL;
4050 data = NULL;
4051 #ifdef DEBUG_PUSH
4052 printf("end of input\n");
4053 #endif
4054 }
4055 }
4056 goto progress;
4057 } else if (ret < 0) {
4058 exec->status = -4;
4059 break;
4060 }
4061 }
4062 if ((exec->transno != 0) || (exec->state->nbTrans == 0)) {
4063 rollback:
4064 /*
4065 * if we didn't yet rollback on the current input
4066 * store the current state as the error state.
4067 */
4068 if ((progress) && (exec->state != NULL) &&
4069 (exec->state->type != XML_REGEXP_SINK_STATE)) {
4070 progress = 0;
4071 if (exec->errString != NULL)
4072 xmlFree(exec->errString);
4073 exec->errString = xmlStrdup(value);
4074 exec->errState = exec->state;
4075 memcpy(exec->errCounts, exec->counts,
4076 exec->comp->nbCounters * sizeof(int));
4077 }
4078
4079 /*
4080 * Failed to find a way out
4081 */
4082 exec->determinist = 0;
4083 xmlFARegExecRollBack(exec);
4084 if (exec->status == 0) {
4085 value = exec->inputStack[exec->index].value;
4086 data = exec->inputStack[exec->index].data;
4087 #ifdef DEBUG_PUSH
4088 printf("value loaded: %s\n", value);
4089 #endif
4090 }
4091 }
4092 continue;
4093 progress:
4094 progress = 1;
4095 continue;
4096 }
4097 if (exec->status == 0) {
4098 return(exec->state->type == XML_REGEXP_FINAL_STATE);
4099 }
4100 #ifdef DEBUG_ERR
4101 if (exec->status < 0) {
4102 testerr(exec);
4103 }
4104 #endif
4105 return(exec->status);
4106 }
4107
4108 /**
4109 * xmlRegExecPushString:
4110 * @exec: a regexp execution context or NULL to indicate the end
4111 * @value: a string token input
4112 * @data: data associated to the token to reuse in callbacks
4113 *
4114 * Push one input token in the execution context
4115 *
4116 * Returns: 1 if the regexp reached a final state, 0 if non-final, and
4117 * a negative value in case of error.
4118 */
4119 int
4120 xmlRegExecPushString(xmlRegExecCtxtPtr exec, const xmlChar *value,
4121 void *data) {
4122 return(xmlRegExecPushStringInternal(exec, value, data, 0));
4123 }
4124
4125 /**
4126 * xmlRegExecPushString2:
4127 * @exec: a regexp execution context or NULL to indicate the end
4128 * @value: the first string token input
4129 * @value2: the second string token input
4130 * @data: data associated to the token to reuse in callbacks
4131 *
4132 * Push one input token in the execution context
4133 *
4134 * Returns: 1 if the regexp reached a final state, 0 if non-final, and
4135 * a negative value in case of error.
4136 */
4137 int
4138 xmlRegExecPushString2(xmlRegExecCtxtPtr exec, const xmlChar *value,
4139 const xmlChar *value2, void *data) {
4140 xmlChar buf[150];
4141 int lenn, lenp, ret;
4142 xmlChar *str;
4143
4144 if (exec == NULL)
4145 return(-1);
4146 if (exec->comp == NULL)
4147 return(-1);
4148 if (exec->status != 0)
4149 return(exec->status);
4150
4151 if (value2 == NULL)
4152 return(xmlRegExecPushString(exec, value, data));
4153
4154 lenn = strlen((char *) value2);
4155 lenp = strlen((char *) value);
4156
4157 if (150 < lenn + lenp + 2) {
4158 str = (xmlChar *) xmlMallocAtomic(lenn + lenp + 2);
4159 if (str == NULL) {
4160 exec->status = -1;
4161 return(-1);
4162 }
4163 } else {
4164 str = buf;
4165 }
4166 memcpy(&str[0], value, lenp);
4167 str[lenp] = XML_REG_STRING_SEPARATOR;
4168 memcpy(&str[lenp + 1], value2, lenn);
4169 str[lenn + lenp + 1] = 0;
4170
4171 if (exec->comp->compact != NULL)
4172 ret = xmlRegCompactPushString(exec, exec->comp, str, data);
4173 else
4174 ret = xmlRegExecPushStringInternal(exec, str, data, 1);
4175
4176 if (str != buf)
4177 xmlFree(str);
4178 return(ret);
4179 }
4180
4181 /**
4182 * xmlRegExecGetValues:
4183 * @exec: a regexp execution context
4184 * @err: error extraction or normal one
4185 * @nbval: pointer to the number of accepted values IN/OUT
4186 * @nbneg: return number of negative transitions
4187 * @values: pointer to the array of acceptable values
4188 * @terminal: return value if this was a terminal state
4189 *
4190 * Extract informations from the regexp execution, internal routine to
4191 * implement xmlRegExecNextValues() and xmlRegExecErrInfo()
4192 *
4193 * Returns: 0 in case of success or -1 in case of error.
4194 */
4195 static int
4196 xmlRegExecGetValues(xmlRegExecCtxtPtr exec, int err,
4197 int *nbval, int *nbneg,
4198 xmlChar **values, int *terminal) {
4199 int maxval;
4200 int nb = 0;
4201
4202 if ((exec == NULL) || (nbval == NULL) || (nbneg == NULL) ||
4203 (values == NULL) || (*nbval <= 0))
4204 return(-1);
4205
4206 maxval = *nbval;
4207 *nbval = 0;
4208 *nbneg = 0;
4209 if ((exec->comp != NULL) && (exec->comp->compact != NULL)) {
4210 xmlRegexpPtr comp;
4211 int target, i, state;
4212
4213 comp = exec->comp;
4214
4215 if (err) {
4216 if (exec->errStateNo == -1) return(-1);
4217 state = exec->errStateNo;
4218 } else {
4219 state = exec->index;
4220 }
4221 if (terminal != NULL) {
4222 if (comp->compact[state * (comp->nbstrings + 1)] ==
4223 XML_REGEXP_FINAL_STATE)
4224 *terminal = 1;
4225 else
4226 *terminal = 0;
4227 }
4228 for (i = 0;(i < comp->nbstrings) && (nb < maxval);i++) {
4229 target = comp->compact[state * (comp->nbstrings + 1) + i + 1];
4230 if ((target > 0) && (target <= comp->nbstates) &&
4231 (comp->compact[(target - 1) * (comp->nbstrings + 1)] !=
4232 XML_REGEXP_SINK_STATE)) {
4233 values[nb++] = comp->stringMap[i];
4234 (*nbval)++;
4235 }
4236 }
4237 for (i = 0;(i < comp->nbstrings) && (nb < maxval);i++) {
4238 target = comp->compact[state * (comp->nbstrings + 1) + i + 1];
4239 if ((target > 0) && (target <= comp->nbstates) &&
4240 (comp->compact[(target - 1) * (comp->nbstrings + 1)] ==
4241 XML_REGEXP_SINK_STATE)) {
4242 values[nb++] = comp->stringMap[i];
4243 (*nbneg)++;
4244 }
4245 }
4246 } else {
4247 int transno;
4248 xmlRegTransPtr trans;
4249 xmlRegAtomPtr atom;
4250 xmlRegStatePtr state;
4251
4252 if (terminal != NULL) {
4253 if (exec->state->type == XML_REGEXP_FINAL_STATE)
4254 *terminal = 1;
4255 else
4256 *terminal = 0;
4257 }
4258
4259 if (err) {
4260 if (exec->errState == NULL) return(-1);
4261 state = exec->errState;
4262 } else {
4263 if (exec->state == NULL) return(-1);
4264 state = exec->state;
4265 }
4266 for (transno = 0;
4267 (transno < state->nbTrans) && (nb < maxval);
4268 transno++) {
4269 trans = &state->trans[transno];
4270 if (trans->to < 0)
4271 continue;
4272 atom = trans->atom;
4273 if ((atom == NULL) || (atom->valuep == NULL))
4274 continue;
4275 if (trans->count == REGEXP_ALL_LAX_COUNTER) {
4276 /* this should not be reached but ... */
4277 TODO;
4278 } else if (trans->count == REGEXP_ALL_COUNTER) {
4279 /* this should not be reached but ... */
4280 TODO;
4281 } else if (trans->counter >= 0) {
4282 xmlRegCounterPtr counter = NULL;
4283 int count;
4284
4285 if (err)
4286 count = exec->errCounts[trans->counter];
4287 else
4288 count = exec->counts[trans->counter];
4289 if (exec->comp != NULL)
4290 counter = &exec->comp->counters[trans->counter];
4291 if ((counter == NULL) || (count < counter->max)) {
4292 if (atom->neg)
4293 values[nb++] = (xmlChar *) atom->valuep2;
4294 else
4295 values[nb++] = (xmlChar *) atom->valuep;
4296 (*nbval)++;
4297 }
4298 } else {
4299 if ((exec->comp->states[trans->to] != NULL) &&
4300 (exec->comp->states[trans->to]->type !=
4301 XML_REGEXP_SINK_STATE)) {
4302 if (atom->neg)
4303 values[nb++] = (xmlChar *) atom->valuep2;
4304 else
4305 values[nb++] = (xmlChar *) atom->valuep;
4306 (*nbval)++;
4307 }
4308 }
4309 }
4310 for (transno = 0;
4311 (transno < state->nbTrans) && (nb < maxval);
4312 transno++) {
4313 trans = &state->trans[transno];
4314 if (trans->to < 0)
4315 continue;
4316 atom = trans->atom;
4317 if ((atom == NULL) || (atom->valuep == NULL))
4318 continue;
4319 if (trans->count == REGEXP_ALL_LAX_COUNTER) {
4320 continue;
4321 } else if (trans->count == REGEXP_ALL_COUNTER) {
4322 continue;
4323 } else if (trans->counter >= 0) {
4324 continue;
4325 } else {
4326 if ((exec->comp->states[trans->to] != NULL) &&
4327 (exec->comp->states[trans->to]->type ==
4328 XML_REGEXP_SINK_STATE)) {
4329 if (atom->neg)
4330 values[nb++] = (xmlChar *) atom->valuep2;
4331 else
4332 values[nb++] = (xmlChar *) atom->valuep;
4333 (*nbneg)++;
4334 }
4335 }
4336 }
4337 }
4338 return(0);
4339 }
4340
4341 /**
4342 * xmlRegExecNextValues:
4343 * @exec: a regexp execution context
4344 * @nbval: pointer to the number of accepted values IN/OUT
4345 * @nbneg: return number of negative transitions
4346 * @values: pointer to the array of acceptable values
4347 * @terminal: return value if this was a terminal state
4348 *
4349 * Extract informations from the regexp execution,
4350 * the parameter @values must point to an array of @nbval string pointers
4351 * on return nbval will contain the number of possible strings in that
4352 * state and the @values array will be updated with them. The string values
4353 * returned will be freed with the @exec context and don't need to be
4354 * deallocated.
4355 *
4356 * Returns: 0 in case of success or -1 in case of error.
4357 */
4358 int
4359 xmlRegExecNextValues(xmlRegExecCtxtPtr exec, int *nbval, int *nbneg,
4360 xmlChar **values, int *terminal) {
4361 return(xmlRegExecGetValues(exec, 0, nbval, nbneg, values, terminal));
4362 }
4363
4364 /**
4365 * xmlRegExecErrInfo:
4366 * @exec: a regexp execution context generating an error
4367 * @string: return value for the error string
4368 * @nbval: pointer to the number of accepted values IN/OUT
4369 * @nbneg: return number of negative transitions
4370 * @values: pointer to the array of acceptable values
4371 * @terminal: return value if this was a terminal state
4372 *
4373 * Extract error informations from the regexp execution, the parameter
4374 * @string will be updated with the value pushed and not accepted,
4375 * the parameter @values must point to an array of @nbval string pointers
4376 * on return nbval will contain the number of possible strings in that
4377 * state and the @values array will be updated with them. The string values
4378 * returned will be freed with the @exec context and don't need to be
4379 * deallocated.
4380 *
4381 * Returns: 0 in case of success or -1 in case of error.
4382 */
4383 int
4384 xmlRegExecErrInfo(xmlRegExecCtxtPtr exec, const xmlChar **string,
4385 int *nbval, int *nbneg, xmlChar **values, int *terminal) {
4386 if (exec == NULL)
4387 return(-1);
4388 if (string != NULL) {
4389 if (exec->status != 0)
4390 *string = exec->errString;
4391 else
4392 *string = NULL;
4393 }
4394 return(xmlRegExecGetValues(exec, 1, nbval, nbneg, values, terminal));
4395 }
4396
4397 #ifdef DEBUG_ERR
4398 static void testerr(xmlRegExecCtxtPtr exec) {
4399 const xmlChar *string;
4400 xmlChar *values[5];
4401 int nb = 5;
4402 int nbneg;
4403 int terminal;
4404 xmlRegExecErrInfo(exec, &string, &nb, &nbneg, &values[0], &terminal);
4405 }
4406 #endif
4407
4408 #if 0
4409 static int
4410 xmlRegExecPushChar(xmlRegExecCtxtPtr exec, int UCS) {
4411 xmlRegTransPtr trans;
4412 xmlRegAtomPtr atom;
4413 int ret;
4414 int codepoint, len;
4415
4416 if (exec == NULL)
4417 return(-1);
4418 if (exec->status != 0)
4419 return(exec->status);
4420
4421 while ((exec->status == 0) &&
4422 ((exec->inputString[exec->index] != 0) ||
4423 (exec->state->type != XML_REGEXP_FINAL_STATE))) {
4424
4425 /*
4426 * End of input on non-terminal state, rollback, however we may
4427 * still have epsilon like transition for counted transitions
4428 * on counters, in that case don't break too early.
4429 */
4430 if ((exec->inputString[exec->index] == 0) && (exec->counts == NULL))
4431 goto rollback;
4432
4433 exec->transcount = 0;
4434 for (;exec->transno < exec->state->nbTrans;exec->transno++) {
4435 trans = &exec->state->trans[exec->transno];
4436 if (trans->to < 0)
4437 continue;
4438 atom = trans->atom;
4439 ret = 0;
4440 if (trans->count >= 0) {
4441 int count;
4442 xmlRegCounterPtr counter;
4443
4444 /*
4445 * A counted transition.
4446 */
4447
4448 count = exec->counts[trans->count];
4449 counter = &exec->comp->counters[trans->count];
4450 #ifdef DEBUG_REGEXP_EXEC
4451 printf("testing count %d: val %d, min %d, max %d\n",
4452 trans->count, count, counter->min, counter->max);
4453 #endif
4454 ret = ((count >= counter->min) && (count <= counter->max));
4455 } else if (atom == NULL) {
4456 fprintf(stderr, "epsilon transition left at runtime\n");
4457 exec->status = -2;
4458 break;
4459 } else if (exec->inputString[exec->index] != 0) {
4460 codepoint = CUR_SCHAR(&(exec->inputString[exec->index]), len);
4461 ret = xmlRegCheckCharacter(atom, codepoint);
4462 if ((ret == 1) && (atom->min > 0) && (atom->max > 0)) {
4463 xmlRegStatePtr to = exec->comp->states[trans->to];
4464
4465 /*
4466 * this is a multiple input sequence
4467 */
4468 if (exec->state->nbTrans > exec->transno + 1) {
4469 xmlFARegExecSave(exec);
4470 }
4471 exec->transcount = 1;
4472 do {
4473 /*
4474 * Try to progress as much as possible on the input
4475 */
4476 if (exec->transcount == atom->max) {
4477 break;
4478 }
4479 exec->index += len;
4480 /*
4481 * End of input: stop here
4482 */
4483 if (exec->inputString[exec->index] == 0) {
4484 exec->index -= len;
4485 break;
4486 }
4487 if (exec->transcount >= atom->min) {
4488 int transno = exec->transno;
4489 xmlRegStatePtr state = exec->state;
4490
4491 /*
4492 * The transition is acceptable save it
4493 */
4494 exec->transno = -1; /* trick */
4495 exec->state = to;
4496 xmlFARegExecSave(exec);
4497 exec->transno = transno;
4498 exec->state = state;
4499 }
4500 codepoint = CUR_SCHAR(&(exec->inputString[exec->index]),
4501 len);
4502 ret = xmlRegCheckCharacter(atom, codepoint);
4503 exec->transcount++;
4504 } while (ret == 1);
4505 if (exec->transcount < atom->min)
4506 ret = 0;
4507
4508 /*
4509 * If the last check failed but one transition was found
4510 * possible, rollback
4511 */
4512 if (ret < 0)
4513 ret = 0;
4514 if (ret == 0) {
4515 goto rollback;
4516 }
4517 }
4518 }
4519 if (ret == 1) {
4520 if (exec->state->nbTrans > exec->transno + 1) {
4521 xmlFARegExecSave(exec);
4522 }
4523 /*
4524 * restart count for expressions like this ((abc){2})*
4525 */
4526 if (trans->count >= 0) {
4527 #ifdef DEBUG_REGEXP_EXEC
4528 printf("Reset count %d\n", trans->count);
4529 #endif
4530 exec->counts[trans->count] = 0;
4531 }
4532 if (trans->counter >= 0) {
4533 #ifdef DEBUG_REGEXP_EXEC
4534 printf("Increasing count %d\n", trans->counter);
4535 #endif
4536 exec->counts[trans->counter]++;
4537 }
4538 #ifdef DEBUG_REGEXP_EXEC
4539 printf("entering state %d\n", trans->to);
4540 #endif
4541 exec->state = exec->comp->states[trans->to];
4542 exec->transno = 0;
4543 if (trans->atom != NULL) {
4544 exec->index += len;
4545 }
4546 goto progress;
4547 } else if (ret < 0) {
4548 exec->status = -4;
4549 break;
4550 }
4551 }
4552 if ((exec->transno != 0) || (exec->state->nbTrans == 0)) {
4553 rollback:
4554 /*
4555 * Failed to find a way out
4556 */
4557 exec->determinist = 0;
4558 xmlFARegExecRollBack(exec);
4559 }
4560 progress:
4561 continue;
4562 }
4563 }
4564 #endif
4565 /************************************************************************
4566 * *
4567 * Parser for the Schemas Datatype Regular Expressions *
4568 * http://www.w3.org/TR/2001/REC-xmlschema-2-20010502/#regexs *
4569 * *
4570 ************************************************************************/
4571
4572 /**
4573 * xmlFAIsChar:
4574 * @ctxt: a regexp parser context
4575 *
4576 * [10] Char ::= [^.\?*+()|#x5B#x5D]
4577 */
4578 static int
4579 xmlFAIsChar(xmlRegParserCtxtPtr ctxt) {
4580 int cur;
4581 int len;
4582
4583 cur = CUR_SCHAR(ctxt->cur, len);
4584 if ((cur == '.') || (cur == '\\') || (cur == '?') ||
4585 (cur == '*') || (cur == '+') || (cur == '(') ||
4586 (cur == ')') || (cur == '|') || (cur == 0x5B) ||
4587 (cur == 0x5D) || (cur == 0))
4588 return(-1);
4589 return(cur);
4590 }
4591
4592 /**
4593 * xmlFAParseCharProp:
4594 * @ctxt: a regexp parser context
4595 *
4596 * [27] charProp ::= IsCategory | IsBlock
4597 * [28] IsCategory ::= Letters | Marks | Numbers | Punctuation |
4598 * Separators | Symbols | Others
4599 * [29] Letters ::= 'L' [ultmo]?
4600 * [30] Marks ::= 'M' [nce]?
4601 * [31] Numbers ::= 'N' [dlo]?
4602 * [32] Punctuation ::= 'P' [cdseifo]?
4603 * [33] Separators ::= 'Z' [slp]?
4604 * [34] Symbols ::= 'S' [mcko]?
4605 * [35] Others ::= 'C' [cfon]?
4606 * [36] IsBlock ::= 'Is' [a-zA-Z0-9#x2D]+
4607 */
4608 static void
4609 xmlFAParseCharProp(xmlRegParserCtxtPtr ctxt) {
4610 int cur;
4611 xmlRegAtomType type = (xmlRegAtomType) 0;
4612 xmlChar *blockName = NULL;
4613
4614 cur = CUR;
4615 if (cur == 'L') {
4616 NEXT;
4617 cur = CUR;
4618 if (cur == 'u') {
4619 NEXT;
4620 type = XML_REGEXP_LETTER_UPPERCASE;
4621 } else if (cur == 'l') {
4622 NEXT;
4623 type = XML_REGEXP_LETTER_LOWERCASE;
4624 } else if (cur == 't') {
4625 NEXT;
4626 type = XML_REGEXP_LETTER_TITLECASE;
4627 } else if (cur == 'm') {
4628 NEXT;
4629 type = XML_REGEXP_LETTER_MODIFIER;
4630 } else if (cur == 'o') {
4631 NEXT;
4632 type = XML_REGEXP_LETTER_OTHERS;
4633 } else {
4634 type = XML_REGEXP_LETTER;
4635 }
4636 } else if (cur == 'M') {
4637 NEXT;
4638 cur = CUR;
4639 if (cur == 'n') {
4640 NEXT;
4641 /* nonspacing */
4642 type = XML_REGEXP_MARK_NONSPACING;
4643 } else if (cur == 'c') {
4644 NEXT;
4645 /* spacing combining */
4646 type = XML_REGEXP_MARK_SPACECOMBINING;
4647 } else if (cur == 'e') {
4648 NEXT;
4649 /* enclosing */
4650 type = XML_REGEXP_MARK_ENCLOSING;
4651 } else {
4652 /* all marks */
4653 type = XML_REGEXP_MARK;
4654 }
4655 } else if (cur == 'N') {
4656 NEXT;
4657 cur = CUR;
4658 if (cur == 'd') {
4659 NEXT;
4660 /* digital */
4661 type = XML_REGEXP_NUMBER_DECIMAL;
4662 } else if (cur == 'l') {
4663 NEXT;
4664 /* letter */
4665 type = XML_REGEXP_NUMBER_LETTER;
4666 } else if (cur == 'o') {
4667 NEXT;
4668 /* other */
4669 type = XML_REGEXP_NUMBER_OTHERS;
4670 } else {
4671 /* all numbers */
4672 type = XML_REGEXP_NUMBER;
4673 }
4674 } else if (cur == 'P') {
4675 NEXT;
4676 cur = CUR;
4677 if (cur == 'c') {
4678 NEXT;
4679 /* connector */
4680 type = XML_REGEXP_PUNCT_CONNECTOR;
4681 } else if (cur == 'd') {
4682 NEXT;
4683 /* dash */
4684 type = XML_REGEXP_PUNCT_DASH;
4685 } else if (cur == 's') {
4686 NEXT;
4687 /* open */
4688 type = XML_REGEXP_PUNCT_OPEN;
4689 } else if (cur == 'e') {
4690 NEXT;
4691 /* close */
4692 type = XML_REGEXP_PUNCT_CLOSE;
4693 } else if (cur == 'i') {
4694 NEXT;
4695 /* initial quote */
4696 type = XML_REGEXP_PUNCT_INITQUOTE;
4697 } else if (cur == 'f') {
4698 NEXT;
4699 /* final quote */
4700 type = XML_REGEXP_PUNCT_FINQUOTE;
4701 } else if (cur == 'o') {
4702 NEXT;
4703 /* other */
4704 type = XML_REGEXP_PUNCT_OTHERS;
4705 } else {
4706 /* all punctuation */
4707 type = XML_REGEXP_PUNCT;
4708 }
4709 } else if (cur == 'Z') {
4710 NEXT;
4711 cur = CUR;
4712 if (cur == 's') {
4713 NEXT;
4714 /* space */
4715 type = XML_REGEXP_SEPAR_SPACE;
4716 } else if (cur == 'l') {
4717 NEXT;
4718 /* line */
4719 type = XML_REGEXP_SEPAR_LINE;
4720 } else if (cur == 'p') {
4721 NEXT;
4722 /* paragraph */
4723 type = XML_REGEXP_SEPAR_PARA;
4724 } else {
4725 /* all separators */
4726 type = XML_REGEXP_SEPAR;
4727 }
4728 } else if (cur == 'S') {
4729 NEXT;
4730 cur = CUR;
4731 if (cur == 'm') {
4732 NEXT;
4733 type = XML_REGEXP_SYMBOL_MATH;
4734 /* math */
4735 } else if (cur == 'c') {
4736 NEXT;
4737 type = XML_REGEXP_SYMBOL_CURRENCY;
4738 /* currency */
4739 } else if (cur == 'k') {
4740 NEXT;
4741 type = XML_REGEXP_SYMBOL_MODIFIER;
4742 /* modifiers */
4743 } else if (cur == 'o') {
4744 NEXT;
4745 type = XML_REGEXP_SYMBOL_OTHERS;
4746 /* other */
4747 } else {
4748 /* all symbols */
4749 type = XML_REGEXP_SYMBOL;
4750 }
4751 } else if (cur == 'C') {
4752 NEXT;
4753 cur = CUR;
4754 if (cur == 'c') {
4755 NEXT;
4756 /* control */
4757 type = XML_REGEXP_OTHER_CONTROL;
4758 } else if (cur == 'f') {
4759 NEXT;
4760 /* format */
4761 type = XML_REGEXP_OTHER_FORMAT;
4762 } else if (cur == 'o') {
4763 NEXT;
4764 /* private use */
4765 type = XML_REGEXP_OTHER_PRIVATE;
4766 } else if (cur == 'n') {
4767 NEXT;
4768 /* not assigned */
4769 type = XML_REGEXP_OTHER_NA;
4770 } else {
4771 /* all others */
4772 type = XML_REGEXP_OTHER;
4773 }
4774 } else if (cur == 'I') {
4775 const xmlChar *start;
4776 NEXT;
4777 cur = CUR;
4778 if (cur != 's') {
4779 ERROR("IsXXXX expected");
4780 return;
4781 }
4782 NEXT;
4783 start = ctxt->cur;
4784 cur = CUR;
4785 if (((cur >= 'a') && (cur <= 'z')) ||
4786 ((cur >= 'A') && (cur <= 'Z')) ||
4787 ((cur >= '0') && (cur <= '9')) ||
4788 (cur == 0x2D)) {
4789 NEXT;
4790 cur = CUR;
4791 while (((cur >= 'a') && (cur <= 'z')) ||
4792 ((cur >= 'A') && (cur <= 'Z')) ||
4793 ((cur >= '0') && (cur <= '9')) ||
4794 (cur == 0x2D)) {
4795 NEXT;
4796 cur = CUR;
4797 }
4798 }
4799 type = XML_REGEXP_BLOCK_NAME;
4800 blockName = xmlStrndup(start, ctxt->cur - start);
4801 } else {
4802 ERROR("Unknown char property");
4803 return;
4804 }
4805 if (ctxt->atom == NULL) {
4806 ctxt->atom = xmlRegNewAtom(ctxt, type);
4807 if (ctxt->atom != NULL)
4808 ctxt->atom->valuep = blockName;
4809 } else if (ctxt->atom->type == XML_REGEXP_RANGES) {
4810 xmlRegAtomAddRange(ctxt, ctxt->atom, ctxt->neg,
4811 type, 0, 0, blockName);
4812 }
4813 }
4814
4815 /**
4816 * xmlFAParseCharClassEsc:
4817 * @ctxt: a regexp parser context
4818 *
4819 * [23] charClassEsc ::= ( SingleCharEsc | MultiCharEsc | catEsc | complEsc )
4820 * [24] SingleCharEsc ::= '\' [nrt\|.?*+(){}#x2D#x5B#x5D#x5E]
4821 * [25] catEsc ::= '\p{' charProp '}'
4822 * [26] complEsc ::= '\P{' charProp '}'
4823 * [37] MultiCharEsc ::= '.' | ('\' [sSiIcCdDwW])
4824 */
4825 static void
4826 xmlFAParseCharClassEsc(xmlRegParserCtxtPtr ctxt) {
4827 int cur;
4828
4829 if (CUR == '.') {
4830 if (ctxt->atom == NULL) {
4831 ctxt->atom = xmlRegNewAtom(ctxt, XML_REGEXP_ANYCHAR);
4832 } else if (ctxt->atom->type == XML_REGEXP_RANGES) {
4833 xmlRegAtomAddRange(ctxt, ctxt->atom, ctxt->neg,
4834 XML_REGEXP_ANYCHAR, 0, 0, NULL);
4835 }
4836 NEXT;
4837 return;
4838 }
4839 if (CUR != '\\') {
4840 ERROR("Escaped sequence: expecting \\");
4841 return;
4842 }
4843 NEXT;
4844 cur = CUR;
4845 if (cur == 'p') {
4846 NEXT;
4847 if (CUR != '{') {
4848 ERROR("Expecting '{'");
4849 return;
4850 }
4851 NEXT;
4852 xmlFAParseCharProp(ctxt);
4853 if (CUR != '}') {
4854 ERROR("Expecting '}'");
4855 return;
4856 }
4857 NEXT;
4858 } else if (cur == 'P') {
4859 NEXT;
4860 if (CUR != '{') {
4861 ERROR("Expecting '{'");
4862 return;
4863 }
4864 NEXT;
4865 xmlFAParseCharProp(ctxt);
4866 ctxt->atom->neg = 1;
4867 if (CUR != '}') {
4868 ERROR("Expecting '}'");
4869 return;
4870 }
4871 NEXT;
4872 } else if ((cur == 'n') || (cur == 'r') || (cur == 't') || (cur == '\\') ||
4873 (cur == '|') || (cur == '.') || (cur == '?') || (cur == '*') ||
4874 (cur == '+') || (cur == '(') || (cur == ')') || (cur == '{') ||
4875 (cur == '}') || (cur == 0x2D) || (cur == 0x5B) || (cur == 0x5D) ||
4876 (cur == 0x5E)) {
4877 if (ctxt->atom == NULL) {
4878 ctxt->atom = xmlRegNewAtom(ctxt, XML_REGEXP_CHARVAL);
4879 if (ctxt->atom != NULL) {
4880 switch (cur) {
4881 case 'n':
4882 ctxt->atom->codepoint = '\n';
4883 break;
4884 case 'r':
4885 ctxt->atom->codepoint = '\r';
4886 break;
4887 case 't':
4888 ctxt->atom->codepoint = '\t';
4889 break;
4890 default:
4891 ctxt->atom->codepoint = cur;
4892 }
4893 }
4894 } else if (ctxt->atom->type == XML_REGEXP_RANGES) {
4895 switch (cur) {
4896 case 'n':
4897 cur = '\n';
4898 break;
4899 case 'r':
4900 cur = '\r';
4901 break;
4902 case 't':
4903 cur = '\t';
4904 break;
4905 }
4906 xmlRegAtomAddRange(ctxt, ctxt->atom, ctxt->neg,
4907 XML_REGEXP_CHARVAL, cur, cur, NULL);
4908 }
4909 NEXT;
4910 } else if ((cur == 's') || (cur == 'S') || (cur == 'i') || (cur == 'I') ||
4911 (cur == 'c') || (cur == 'C') || (cur == 'd') || (cur == 'D') ||
4912 (cur == 'w') || (cur == 'W')) {
4913 xmlRegAtomType type = XML_REGEXP_ANYSPACE;
4914
4915 switch (cur) {
4916 case 's':
4917 type = XML_REGEXP_ANYSPACE;
4918 break;
4919 case 'S':
4920 type = XML_REGEXP_NOTSPACE;
4921 break;
4922 case 'i':
4923 type = XML_REGEXP_INITNAME;
4924 break;
4925 case 'I':
4926 type = XML_REGEXP_NOTINITNAME;
4927 break;
4928 case 'c':
4929 type = XML_REGEXP_NAMECHAR;
4930 break;
4931 case 'C':
4932 type = XML_REGEXP_NOTNAMECHAR;
4933 break;
4934 case 'd':
4935 type = XML_REGEXP_DECIMAL;
4936 break;
4937 case 'D':
4938 type = XML_REGEXP_NOTDECIMAL;
4939 break;
4940 case 'w':
4941 type = XML_REGEXP_REALCHAR;
4942 break;
4943 case 'W':
4944 type = XML_REGEXP_NOTREALCHAR;
4945 break;
4946 }
4947 NEXT;
4948 if (ctxt->atom == NULL) {
4949 ctxt->atom = xmlRegNewAtom(ctxt, type);
4950 } else if (ctxt->atom->type == XML_REGEXP_RANGES) {
4951 xmlRegAtomAddRange(ctxt, ctxt->atom, ctxt->neg,
4952 type, 0, 0, NULL);
4953 }
4954 } else {
4955 ERROR("Wrong escape sequence, misuse of character '\\'");
4956 }
4957 }
4958
4959 /**
4960 * xmlFAParseCharRange:
4961 * @ctxt: a regexp parser context
4962 *
4963 * [17] charRange ::= seRange | XmlCharRef | XmlCharIncDash
4964 * [18] seRange ::= charOrEsc '-' charOrEsc
4965 * [20] charOrEsc ::= XmlChar | SingleCharEsc
4966 * [21] XmlChar ::= [^\#x2D#x5B#x5D]
4967 * [22] XmlCharIncDash ::= [^\#x5B#x5D]
4968 */
4969 static void
4970 xmlFAParseCharRange(xmlRegParserCtxtPtr ctxt) {
4971 int cur, len;
4972 int start = -1;
4973 int end = -1;
4974
4975 if (CUR == '\0') {
4976 ERROR("Expecting ']'");
4977 return;
4978 }
4979
4980 cur = CUR;
4981 if (cur == '\\') {
4982 NEXT;
4983 cur = CUR;
4984 switch (cur) {
4985 case 'n': start = 0xA; break;
4986 case 'r': start = 0xD; break;
4987 case 't': start = 0x9; break;
4988 case '\\': case '|': case '.': case '-': case '^': case '?':
4989 case '*': case '+': case '{': case '}': case '(': case ')':
4990 case '[': case ']':
4991 start = cur; break;
4992 default:
4993 ERROR("Invalid escape value");
4994 return;
4995 }
4996 end = start;
4997 len = 1;
4998 } else if ((cur != 0x5B) && (cur != 0x5D)) {
4999 end = start = CUR_SCHAR(ctxt->cur, len);
5000 } else {
5001 ERROR("Expecting a char range");
5002 return;
5003 }
5004 /*
5005 * Since we are "inside" a range, we can assume ctxt->cur is past
5006 * the start of ctxt->string, and PREV should be safe
5007 */
5008 if ((start == '-') && (NXT(1) != ']') && (PREV != '[') && (PREV != '^')) {
5009 NEXTL(len);
5010 return;
5011 }
5012 NEXTL(len);
5013 cur = CUR;
5014 if ((cur != '-') || (NXT(1) == ']')) {
5015 xmlRegAtomAddRange(ctxt, ctxt->atom, ctxt->neg,
5016 XML_REGEXP_CHARVAL, start, end, NULL);
5017 return;
5018 }
5019 NEXT;
5020 cur = CUR;
5021 if (cur == '\\') {
5022 NEXT;
5023 cur = CUR;
5024 switch (cur) {
5025 case 'n': end = 0xA; break;
5026 case 'r': end = 0xD; break;
5027 case 't': end = 0x9; break;
5028 case '\\': case '|': case '.': case '-': case '^': case '?':
5029 case '*': case '+': case '{': case '}': case '(': case ')':
5030 case '[': case ']':
5031 end = cur; break;
5032 default:
5033 ERROR("Invalid escape value");
5034 return;
5035 }
5036 len = 1;
5037 } else if ((cur != 0x5B) && (cur != 0x5D)) {
5038 end = CUR_SCHAR(ctxt->cur, len);
5039 } else {
5040 ERROR("Expecting the end of a char range");
5041 return;
5042 }
5043 NEXTL(len);
5044 /* TODO check that the values are acceptable character ranges for XML */
5045 if (end < start) {
5046 ERROR("End of range is before start of range");
5047 } else {
5048 xmlRegAtomAddRange(ctxt, ctxt->atom, ctxt->neg,
5049 XML_REGEXP_CHARVAL, start, end, NULL);
5050 }
5051 return;
5052 }
5053
5054 /**
5055 * xmlFAParsePosCharGroup:
5056 * @ctxt: a regexp parser context
5057 *
5058 * [14] posCharGroup ::= ( charRange | charClassEsc )+
5059 */
5060 static void
5061 xmlFAParsePosCharGroup(xmlRegParserCtxtPtr ctxt) {
5062 do {
5063 if (CUR == '\\') {
5064 xmlFAParseCharClassEsc(ctxt);
5065 } else {
5066 xmlFAParseCharRange(ctxt);
5067 }
5068 } while ((CUR != ']') && (CUR != '^') && (CUR != '-') &&
5069 (CUR != 0) && (ctxt->error == 0));
5070 }
5071
5072 /**
5073 * xmlFAParseCharGroup:
5074 * @ctxt: a regexp parser context
5075 *
5076 * [13] charGroup ::= posCharGroup | negCharGroup | charClassSub
5077 * [15] negCharGroup ::= '^' posCharGroup
5078 * [16] charClassSub ::= ( posCharGroup | negCharGroup ) '-' charClassExpr
5079 * [12] charClassExpr ::= '[' charGroup ']'
5080 */
5081 static void
5082 xmlFAParseCharGroup(xmlRegParserCtxtPtr ctxt) {
5083 int n = ctxt->neg;
5084 while ((CUR != ']') && (ctxt->error == 0)) {
5085 if (CUR == '^') {
5086 int neg = ctxt->neg;
5087
5088 NEXT;
5089 ctxt->neg = !ctxt->neg;
5090 xmlFAParsePosCharGroup(ctxt);
5091 ctxt->neg = neg;
5092 } else if ((CUR == '-') && (NXT(1) == '[')) {
5093 int neg = ctxt->neg;
5094 ctxt->neg = 2;
5095 NEXT; /* eat the '-' */
5096 NEXT; /* eat the '[' */
5097 xmlFAParseCharGroup(ctxt);
5098 if (CUR == ']') {
5099 NEXT;
5100 } else {
5101 ERROR("charClassExpr: ']' expected");
5102 break;
5103 }
5104 ctxt->neg = neg;
5105 break;
5106 } else if (CUR != ']') {
5107 xmlFAParsePosCharGroup(ctxt);
5108 }
5109 }
5110 ctxt->neg = n;
5111 }
5112
5113 /**
5114 * xmlFAParseCharClass:
5115 * @ctxt: a regexp parser context
5116 *
5117 * [11] charClass ::= charClassEsc | charClassExpr
5118 * [12] charClassExpr ::= '[' charGroup ']'
5119 */
5120 static void
5121 xmlFAParseCharClass(xmlRegParserCtxtPtr ctxt) {
5122 if (CUR == '[') {
5123 NEXT;
5124 ctxt->atom = xmlRegNewAtom(ctxt, XML_REGEXP_RANGES);
5125 if (ctxt->atom == NULL)
5126 return;
5127 xmlFAParseCharGroup(ctxt);
5128 if (CUR == ']') {
5129 NEXT;
5130 } else {
5131 ERROR("xmlFAParseCharClass: ']' expected");
5132 }
5133 } else {
5134 xmlFAParseCharClassEsc(ctxt);
5135 }
5136 }
5137
5138 /**
5139 * xmlFAParseQuantExact:
5140 * @ctxt: a regexp parser context
5141 *
5142 * [8] QuantExact ::= [0-9]+
5143 *
5144 * Returns 0 if success or -1 in case of error
5145 */
5146 static int
5147 xmlFAParseQuantExact(xmlRegParserCtxtPtr ctxt) {
5148 int ret = 0;
5149 int ok = 0;
5150
5151 while ((CUR >= '0') && (CUR <= '9')) {
5152 ret = ret * 10 + (CUR - '0');
5153 ok = 1;
5154 NEXT;
5155 }
5156 if (ok != 1) {
5157 return(-1);
5158 }
5159 return(ret);
5160 }
5161
5162 /**
5163 * xmlFAParseQuantifier:
5164 * @ctxt: a regexp parser context
5165 *
5166 * [4] quantifier ::= [?*+] | ( '{' quantity '}' )
5167 * [5] quantity ::= quantRange | quantMin | QuantExact
5168 * [6] quantRange ::= QuantExact ',' QuantExact
5169 * [7] quantMin ::= QuantExact ','
5170 * [8] QuantExact ::= [0-9]+
5171 */
5172 static int
5173 xmlFAParseQuantifier(xmlRegParserCtxtPtr ctxt) {
5174 int cur;
5175
5176 cur = CUR;
5177 if ((cur == '?') || (cur == '*') || (cur == '+')) {
5178 if (ctxt->atom != NULL) {
5179 if (cur == '?')
5180 ctxt->atom->quant = XML_REGEXP_QUANT_OPT;
5181 else if (cur == '*')
5182 ctxt->atom->quant = XML_REGEXP_QUANT_MULT;
5183 else if (cur == '+')
5184 ctxt->atom->quant = XML_REGEXP_QUANT_PLUS;
5185 }
5186 NEXT;
5187 return(1);
5188 }
5189 if (cur == '{') {
5190 int min = 0, max = 0;
5191
5192 NEXT;
5193 cur = xmlFAParseQuantExact(ctxt);
5194 if (cur >= 0)
5195 min = cur;
5196 if (CUR == ',') {
5197 NEXT;
5198 if (CUR == '}')
5199 max = INT_MAX;
5200 else {
5201 cur = xmlFAParseQuantExact(ctxt);
5202 if (cur >= 0)
5203 max = cur;
5204 else {
5205 ERROR("Improper quantifier");
5206 }
5207 }
5208 }
5209 if (CUR == '}') {
5210 NEXT;
5211 } else {
5212 ERROR("Unterminated quantifier");
5213 }
5214 if (max == 0)
5215 max = min;
5216 if (ctxt->atom != NULL) {
5217 ctxt->atom->quant = XML_REGEXP_QUANT_RANGE;
5218 ctxt->atom->min = min;
5219 ctxt->atom->max = max;
5220 }
5221 return(1);
5222 }
5223 return(0);
5224 }
5225
5226 /**
5227 * xmlFAParseAtom:
5228 * @ctxt: a regexp parser context
5229 *
5230 * [9] atom ::= Char | charClass | ( '(' regExp ')' )
5231 */
5232 static int
5233 xmlFAParseAtom(xmlRegParserCtxtPtr ctxt) {
5234 int codepoint, len;
5235
5236 codepoint = xmlFAIsChar(ctxt);
5237 if (codepoint > 0) {
5238 ctxt->atom = xmlRegNewAtom(ctxt, XML_REGEXP_CHARVAL);
5239 if (ctxt->atom == NULL)
5240 return(-1);
5241 codepoint = CUR_SCHAR(ctxt->cur, len);
5242 ctxt->atom->codepoint = codepoint;
5243 NEXTL(len);
5244 return(1);
5245 } else if (CUR == '|') {
5246 return(0);
5247 } else if (CUR == 0) {
5248 return(0);
5249 } else if (CUR == ')') {
5250 return(0);
5251 } else if (CUR == '(') {
5252 xmlRegStatePtr start, oldend, start0;
5253
5254 NEXT;
5255 /*
5256 * this extra Epsilon transition is needed if we count with 0 allowed
5257 * unfortunately this can't be known at that point
5258 */
5259 xmlFAGenerateEpsilonTransition(ctxt, ctxt->state, NULL);
5260 start0 = ctxt->state;
5261 xmlFAGenerateEpsilonTransition(ctxt, ctxt->state, NULL);
5262 start = ctxt->state;
5263 oldend = ctxt->end;
5264 ctxt->end = NULL;
5265 ctxt->atom = NULL;
5266 xmlFAParseRegExp(ctxt, 0);
5267 if (CUR == ')') {
5268 NEXT;
5269 } else {
5270 ERROR("xmlFAParseAtom: expecting ')'");
5271 }
5272 ctxt->atom = xmlRegNewAtom(ctxt, XML_REGEXP_SUBREG);
5273 if (ctxt->atom == NULL)
5274 return(-1);
5275 ctxt->atom->start = start;
5276 ctxt->atom->start0 = start0;
5277 ctxt->atom->stop = ctxt->state;
5278 ctxt->end = oldend;
5279 return(1);
5280 } else if ((CUR == '[') || (CUR == '\\') || (CUR == '.')) {
5281 xmlFAParseCharClass(ctxt);
5282 return(1);
5283 }
5284 return(0);
5285 }
5286
5287 /**
5288 * xmlFAParsePiece:
5289 * @ctxt: a regexp parser context
5290 *
5291 * [3] piece ::= atom quantifier?
5292 */
5293 static int
5294 xmlFAParsePiece(xmlRegParserCtxtPtr ctxt) {
5295 int ret;
5296
5297 ctxt->atom = NULL;
5298 ret = xmlFAParseAtom(ctxt);
5299 if (ret == 0)
5300 return(0);
5301 if (ctxt->atom == NULL) {
5302 ERROR("internal: no atom generated");
5303 }
5304 xmlFAParseQuantifier(ctxt);
5305 return(1);
5306 }
5307
5308 /**
5309 * xmlFAParseBranch:
5310 * @ctxt: a regexp parser context
5311 * @to: optional target to the end of the branch
5312 *
5313 * @to is used to optimize by removing duplicate path in automata
5314 * in expressions like (a|b)(c|d)
5315 *
5316 * [2] branch ::= piece*
5317 */
5318 static int
5319 xmlFAParseBranch(xmlRegParserCtxtPtr ctxt, xmlRegStatePtr to) {
5320 xmlRegStatePtr previous;
5321 int ret;
5322
5323 previous = ctxt->state;
5324 ret = xmlFAParsePiece(ctxt);
5325 if (ret != 0) {
5326 if (xmlFAGenerateTransitions(ctxt, previous,
5327 (CUR=='|' || CUR==')') ? to : NULL, ctxt->atom) < 0)
5328 return(-1);
5329 previous = ctxt->state;
5330 ctxt->atom = NULL;
5331 }
5332 while ((ret != 0) && (ctxt->error == 0)) {
5333 ret = xmlFAParsePiece(ctxt);
5334 if (ret != 0) {
5335 if (xmlFAGenerateTransitions(ctxt, previous,
5336 (CUR=='|' || CUR==')') ? to : NULL, ctxt->atom) < 0)
5337 return(-1);
5338 previous = ctxt->state;
5339 ctxt->atom = NULL;
5340 }
5341 }
5342 return(0);
5343 }
5344
5345 /**
5346 * xmlFAParseRegExp:
5347 * @ctxt: a regexp parser context
5348 * @top: is this the top-level expression ?
5349 *
5350 * [1] regExp ::= branch ( '|' branch )*
5351 */
5352 static void
5353 xmlFAParseRegExp(xmlRegParserCtxtPtr ctxt, int top) {
5354 xmlRegStatePtr start, end;
5355
5356 /* if not top start should have been generated by an epsilon trans */
5357 start = ctxt->state;
5358 ctxt->end = NULL;
5359 xmlFAParseBranch(ctxt, NULL);
5360 if (top) {
5361 #ifdef DEBUG_REGEXP_GRAPH
5362 printf("State %d is final\n", ctxt->state->no);
5363 #endif
5364 ctxt->state->type = XML_REGEXP_FINAL_STATE;
5365 }
5366 if (CUR != '|') {
5367 ctxt->end = ctxt->state;
5368 return;
5369 }
5370 end = ctxt->state;
5371 while ((CUR == '|') && (ctxt->error == 0)) {
5372 NEXT;
5373 ctxt->state = start;
5374 ctxt->end = NULL;
5375 xmlFAParseBranch(ctxt, end);
5376 }
5377 if (!top) {
5378 ctxt->state = end;
5379 ctxt->end = end;
5380 }
5381 }
5382
5383 /************************************************************************
5384 * *
5385 * The basic API *
5386 * *
5387 ************************************************************************/
5388
5389 /**
5390 * xmlRegexpPrint:
5391 * @output: the file for the output debug
5392 * @regexp: the compiled regexp
5393 *
5394 * Print the content of the compiled regular expression
5395 */
5396 void
5397 xmlRegexpPrint(FILE *output, xmlRegexpPtr regexp) {
5398 int i;
5399
5400 if (output == NULL)
5401 return;
5402 fprintf(output, " regexp: ");
5403 if (regexp == NULL) {
5404 fprintf(output, "NULL\n");
5405 return;
5406 }
5407 fprintf(output, "'%s' ", regexp->string);
5408 fprintf(output, "\n");
5409 fprintf(output, "%d atoms:\n", regexp->nbAtoms);
5410 for (i = 0;i < regexp->nbAtoms; i++) {
5411 fprintf(output, " %02d ", i);
5412 xmlRegPrintAtom(output, regexp->atoms[i]);
5413 }
5414 fprintf(output, "%d states:", regexp->nbStates);
5415 fprintf(output, "\n");
5416 for (i = 0;i < regexp->nbStates; i++) {
5417 xmlRegPrintState(output, regexp->states[i]);
5418 }
5419 fprintf(output, "%d counters:\n", regexp->nbCounters);
5420 for (i = 0;i < regexp->nbCounters; i++) {
5421 fprintf(output, " %d: min %d max %d\n", i, regexp->counters[i].min,
5422 regexp->counters[i].max);
5423 }
5424 }
5425
5426 /**
5427 * xmlRegexpCompile:
5428 * @regexp: a regular expression string
5429 *
5430 * Parses a regular expression conforming to XML Schemas Part 2 Datatype
5431 * Appendix F and builds an automata suitable for testing strings against
5432 * that regular expression
5433 *
5434 * Returns the compiled expression or NULL in case of error
5435 */
5436 xmlRegexpPtr
5437 xmlRegexpCompile(const xmlChar *regexp) {
5438 xmlRegexpPtr ret;
5439 xmlRegParserCtxtPtr ctxt;
5440
5441 ctxt = xmlRegNewParserCtxt(regexp);
5442 if (ctxt == NULL)
5443 return(NULL);
5444
5445 /* initialize the parser */
5446 ctxt->end = NULL;
5447 ctxt->start = ctxt->state = xmlRegNewState(ctxt);
5448 xmlRegStatePush(ctxt, ctxt->start);
5449
5450 /* parse the expression building an automata */
5451 xmlFAParseRegExp(ctxt, 1);
5452 if (CUR != 0) {
5453 ERROR("xmlFAParseRegExp: extra characters");
5454 }
5455 if (ctxt->error != 0) {
5456 xmlRegFreeParserCtxt(ctxt);
5457 return(NULL);
5458 }
5459 ctxt->end = ctxt->state;
5460 ctxt->start->type = XML_REGEXP_START_STATE;
5461 ctxt->end->type = XML_REGEXP_FINAL_STATE;
5462
5463 /* remove the Epsilon except for counted transitions */
5464 xmlFAEliminateEpsilonTransitions(ctxt);
5465
5466
5467 if (ctxt->error != 0) {
5468 xmlRegFreeParserCtxt(ctxt);
5469 return(NULL);
5470 }
5471 ret = xmlRegEpxFromParse(ctxt);
5472 xmlRegFreeParserCtxt(ctxt);
5473 return(ret);
5474 }
5475
5476 /**
5477 * xmlRegexpExec:
5478 * @comp: the compiled regular expression
5479 * @content: the value to check against the regular expression
5480 *
5481 * Check if the regular expression generates the value
5482 *
5483 * Returns 1 if it matches, 0 if not and a negative value in case of error
5484 */
5485 int
5486 xmlRegexpExec(xmlRegexpPtr comp, const xmlChar *content) {
5487 if ((comp == NULL) || (content == NULL))
5488 return(-1);
5489 return(xmlFARegExec(comp, content));
5490 }
5491
5492 /**
5493 * xmlRegexpIsDeterminist:
5494 * @comp: the compiled regular expression
5495 *
5496 * Check if the regular expression is determinist
5497 *
5498 * Returns 1 if it yes, 0 if not and a negative value in case of error
5499 */
5500 int
5501 xmlRegexpIsDeterminist(xmlRegexpPtr comp) {
5502 xmlAutomataPtr am;
5503 int ret;
5504
5505 if (comp == NULL)
5506 return(-1);
5507 if (comp->determinist != -1)
5508 return(comp->determinist);
5509
5510 am = xmlNewAutomata();
5511 if (am->states != NULL) {
5512 int i;
5513
5514 for (i = 0;i < am->nbStates;i++)
5515 xmlRegFreeState(am->states[i]);
5516 xmlFree(am->states);
5517 }
5518 am->nbAtoms = comp->nbAtoms;
5519 am->atoms = comp->atoms;
5520 am->nbStates = comp->nbStates;
5521 am->states = comp->states;
5522 am->determinist = -1;
5523 am->flags = comp->flags;
5524 ret = xmlFAComputesDeterminism(am);
5525 am->atoms = NULL;
5526 am->states = NULL;
5527 xmlFreeAutomata(am);
5528 comp->determinist = ret;
5529 return(ret);
5530 }
5531
5532 /**
5533 * xmlRegFreeRegexp:
5534 * @regexp: the regexp
5535 *
5536 * Free a regexp
5537 */
5538 void
5539 xmlRegFreeRegexp(xmlRegexpPtr regexp) {
5540 int i;
5541 if (regexp == NULL)
5542 return;
5543
5544 if (regexp->string != NULL)
5545 xmlFree(regexp->string);
5546 if (regexp->states != NULL) {
5547 for (i = 0;i < regexp->nbStates;i++)
5548 xmlRegFreeState(regexp->states[i]);
5549 xmlFree(regexp->states);
5550 }
5551 if (regexp->atoms != NULL) {
5552 for (i = 0;i < regexp->nbAtoms;i++)
5553 xmlRegFreeAtom(regexp->atoms[i]);
5554 xmlFree(regexp->atoms);
5555 }
5556 if (regexp->counters != NULL)
5557 xmlFree(regexp->counters);
5558 if (regexp->compact != NULL)
5559 xmlFree(regexp->compact);
5560 if (regexp->transdata != NULL)
5561 xmlFree(regexp->transdata);
5562 if (regexp->stringMap != NULL) {
5563 for (i = 0; i < regexp->nbstrings;i++)
5564 xmlFree(regexp->stringMap[i]);
5565 xmlFree(regexp->stringMap);
5566 }
5567
5568 xmlFree(regexp);
5569 }
5570
5571 #ifdef LIBXML_AUTOMATA_ENABLED
5572 /************************************************************************
5573 * *
5574 * The Automata interface *
5575 * *
5576 ************************************************************************/
5577
5578 /**
5579 * xmlNewAutomata:
5580 *
5581 * Create a new automata
5582 *
5583 * Returns the new object or NULL in case of failure
5584 */
5585 xmlAutomataPtr
5586 xmlNewAutomata(void) {
5587 xmlAutomataPtr ctxt;
5588
5589 ctxt = xmlRegNewParserCtxt(NULL);
5590 if (ctxt == NULL)
5591 return(NULL);
5592
5593 /* initialize the parser */
5594 ctxt->end = NULL;
5595 ctxt->start = ctxt->state = xmlRegNewState(ctxt);
5596 if (ctxt->start == NULL) {
5597 xmlFreeAutomata(ctxt);
5598 return(NULL);
5599 }
5600 ctxt->start->type = XML_REGEXP_START_STATE;
5601 if (xmlRegStatePush(ctxt, ctxt->start) < 0) {
5602 xmlRegFreeState(ctxt->start);
5603 xmlFreeAutomata(ctxt);
5604 return(NULL);
5605 }
5606 ctxt->flags = 0;
5607
5608 return(ctxt);
5609 }
5610
5611 /**
5612 * xmlFreeAutomata:
5613 * @am: an automata
5614 *
5615 * Free an automata
5616 */
5617 void
5618 xmlFreeAutomata(xmlAutomataPtr am) {
5619 if (am == NULL)
5620 return;
5621 xmlRegFreeParserCtxt(am);
5622 }
5623
5624 /**
5625 * xmlAutomataSetFlags:
5626 * @am: an automata
5627 * @flags: a set of internal flags
5628 *
5629 * Set some flags on the automata
5630 */
5631 void
5632 xmlAutomataSetFlags(xmlAutomataPtr am, int flags) {
5633 if (am == NULL)
5634 return;
5635 am->flags |= flags;
5636 }
5637
5638 /**
5639 * xmlAutomataGetInitState:
5640 * @am: an automata
5641 *
5642 * Initial state lookup
5643 *
5644 * Returns the initial state of the automata
5645 */
5646 xmlAutomataStatePtr
5647 xmlAutomataGetInitState(xmlAutomataPtr am) {
5648 if (am == NULL)
5649 return(NULL);
5650 return(am->start);
5651 }
5652
5653 /**
5654 * xmlAutomataSetFinalState:
5655 * @am: an automata
5656 * @state: a state in this automata
5657 *
5658 * Makes that state a final state
5659 *
5660 * Returns 0 or -1 in case of error
5661 */
5662 int
5663 xmlAutomataSetFinalState(xmlAutomataPtr am, xmlAutomataStatePtr state) {
5664 if ((am == NULL) || (state == NULL))
5665 return(-1);
5666 state->type = XML_REGEXP_FINAL_STATE;
5667 return(0);
5668 }
5669
5670 /**
5671 * xmlAutomataNewTransition:
5672 * @am: an automata
5673 * @from: the starting point of the transition
5674 * @to: the target point of the transition or NULL
5675 * @token: the input string associated to that transition
5676 * @data: data passed to the callback function if the transition is activated
5677 *
5678 * If @to is NULL, this creates first a new target state in the automata
5679 * and then adds a transition from the @from state to the target state
5680 * activated by the value of @token
5681 *
5682 * Returns the target state or NULL in case of error
5683 */
5684 xmlAutomataStatePtr
5685 xmlAutomataNewTransition(xmlAutomataPtr am, xmlAutomataStatePtr from,
5686 xmlAutomataStatePtr to, const xmlChar *token,
5687 void *data) {
5688 xmlRegAtomPtr atom;
5689
5690 if ((am == NULL) || (from == NULL) || (token == NULL))
5691 return(NULL);
5692 atom = xmlRegNewAtom(am, XML_REGEXP_STRING);
5693 if (atom == NULL)
5694 return(NULL);
5695 atom->data = data;
5696 if (atom == NULL)
5697 return(NULL);
5698 atom->valuep = xmlStrdup(token);
5699
5700 if (xmlFAGenerateTransitions(am, from, to, atom) < 0) {
5701 xmlRegFreeAtom(atom);
5702 return(NULL);
5703 }
5704 if (to == NULL)
5705 return(am->state);
5706 return(to);
5707 }
5708
5709 /**
5710 * xmlAutomataNewTransition2:
5711 * @am: an automata
5712 * @from: the starting point of the transition
5713 * @to: the target point of the transition or NULL
5714 * @token: the first input string associated to that transition
5715 * @token2: the second input string associated to that transition
5716 * @data: data passed to the callback function if the transition is activated
5717 *
5718 * If @to is NULL, this creates first a new target state in the automata
5719 * and then adds a transition from the @from state to the target state
5720 * activated by the value of @token
5721 *
5722 * Returns the target state or NULL in case of error
5723 */
5724 xmlAutomataStatePtr
5725 xmlAutomataNewTransition2(xmlAutomataPtr am, xmlAutomataStatePtr from,
5726 xmlAutomataStatePtr to, const xmlChar *token,
5727 const xmlChar *token2, void *data) {
5728 xmlRegAtomPtr atom;
5729
5730 if ((am == NULL) || (from == NULL) || (token == NULL))
5731 return(NULL);
5732 atom = xmlRegNewAtom(am, XML_REGEXP_STRING);
5733 if (atom == NULL)
5734 return(NULL);
5735 atom->data = data;
5736 if ((token2 == NULL) || (*token2 == 0)) {
5737 atom->valuep = xmlStrdup(token);
5738 } else {
5739 int lenn, lenp;
5740 xmlChar *str;
5741
5742 lenn = strlen((char *) token2);
5743 lenp = strlen((char *) token);
5744
5745 str = (xmlChar *) xmlMallocAtomic(lenn + lenp + 2);
5746 if (str == NULL) {
5747 xmlRegFreeAtom(atom);
5748 return(NULL);
5749 }
5750 memcpy(&str[0], token, lenp);
5751 str[lenp] = '|';
5752 memcpy(&str[lenp + 1], token2, lenn);
5753 str[lenn + lenp + 1] = 0;
5754
5755 atom->valuep = str;
5756 }
5757
5758 if (xmlFAGenerateTransitions(am, from, to, atom) < 0) {
5759 xmlRegFreeAtom(atom);
5760 return(NULL);
5761 }
5762 if (to == NULL)
5763 return(am->state);
5764 return(to);
5765 }
5766
5767 /**
5768 * xmlAutomataNewNegTrans:
5769 * @am: an automata
5770 * @from: the starting point of the transition
5771 * @to: the target point of the transition or NULL
5772 * @token: the first input string associated to that transition
5773 * @token2: the second input string associated to that transition
5774 * @data: data passed to the callback function if the transition is activated
5775 *
5776 * If @to is NULL, this creates first a new target state in the automata
5777 * and then adds a transition from the @from state to the target state
5778 * activated by any value except (@token,@token2)
5779 * Note that if @token2 is not NULL, then (X, NULL) won't match to follow
5780 # the semantic of XSD ##other
5781 *
5782 * Returns the target state or NULL in case of error
5783 */
5784 xmlAutomataStatePtr
5785 xmlAutomataNewNegTrans(xmlAutomataPtr am, xmlAutomataStatePtr from,
5786 xmlAutomataStatePtr to, const xmlChar *token,
5787 const xmlChar *token2, void *data) {
5788 xmlRegAtomPtr atom;
5789 xmlChar err_msg[200];
5790
5791 if ((am == NULL) || (from == NULL) || (token == NULL))
5792 return(NULL);
5793 atom = xmlRegNewAtom(am, XML_REGEXP_STRING);
5794 if (atom == NULL)
5795 return(NULL);
5796 atom->data = data;
5797 atom->neg = 1;
5798 if ((token2 == NULL) || (*token2 == 0)) {
5799 atom->valuep = xmlStrdup(token);
5800 } else {
5801 int lenn, lenp;
5802 xmlChar *str;
5803
5804 lenn = strlen((char *) token2);
5805 lenp = strlen((char *) token);
5806
5807 str = (xmlChar *) xmlMallocAtomic(lenn + lenp + 2);
5808 if (str == NULL) {
5809 xmlRegFreeAtom(atom);
5810 return(NULL);
5811 }
5812 memcpy(&str[0], token, lenp);
5813 str[lenp] = '|';
5814 memcpy(&str[lenp + 1], token2, lenn);
5815 str[lenn + lenp + 1] = 0;
5816
5817 atom->valuep = str;
5818 }
5819 snprintf((char *) err_msg, 199, "not %s", (const char *) atom->valuep);
5820 err_msg[199] = 0;
5821 atom->valuep2 = xmlStrdup(err_msg);
5822
5823 if (xmlFAGenerateTransitions(am, from, to, atom) < 0) {
5824 xmlRegFreeAtom(atom);
5825 return(NULL);
5826 }
5827 am->negs++;
5828 if (to == NULL)
5829 return(am->state);
5830 return(to);
5831 }
5832
5833 /**
5834 * xmlAutomataNewCountTrans2:
5835 * @am: an automata
5836 * @from: the starting point of the transition
5837 * @to: the target point of the transition or NULL
5838 * @token: the input string associated to that transition
5839 * @token2: the second input string associated to that transition
5840 * @min: the minimum successive occurences of token
5841 * @max: the maximum successive occurences of token
5842 * @data: data associated to the transition
5843 *
5844 * If @to is NULL, this creates first a new target state in the automata
5845 * and then adds a transition from the @from state to the target state
5846 * activated by a succession of input of value @token and @token2 and
5847 * whose number is between @min and @max
5848 *
5849 * Returns the target state or NULL in case of error
5850 */
5851 xmlAutomataStatePtr
5852 xmlAutomataNewCountTrans2(xmlAutomataPtr am, xmlAutomataStatePtr from,
5853 xmlAutomataStatePtr to, const xmlChar *token,
5854 const xmlChar *token2,
5855 int min, int max, void *data) {
5856 xmlRegAtomPtr atom;
5857 int counter;
5858
5859 if ((am == NULL) || (from == NULL) || (token == NULL))
5860 return(NULL);
5861 if (min < 0)
5862 return(NULL);
5863 if ((max < min) || (max < 1))
5864 return(NULL);
5865 atom = xmlRegNewAtom(am, XML_REGEXP_STRING);
5866 if (atom == NULL)
5867 return(NULL);
5868 if ((token2 == NULL) || (*token2 == 0)) {
5869 atom->valuep = xmlStrdup(token);
5870 } else {
5871 int lenn, lenp;
5872 xmlChar *str;
5873
5874 lenn = strlen((char *) token2);
5875 lenp = strlen((char *) token);
5876
5877 str = (xmlChar *) xmlMallocAtomic(lenn + lenp + 2);
5878 if (str == NULL) {
5879 xmlRegFreeAtom(atom);
5880 return(NULL);
5881 }
5882 memcpy(&str[0], token, lenp);
5883 str[lenp] = '|';
5884 memcpy(&str[lenp + 1], token2, lenn);
5885 str[lenn + lenp + 1] = 0;
5886
5887 atom->valuep = str;
5888 }
5889 atom->data = data;
5890 if (min == 0)
5891 atom->min = 1;
5892 else
5893 atom->min = min;
5894 atom->max = max;
5895
5896 /*
5897 * associate a counter to the transition.
5898 */
5899 counter = xmlRegGetCounter(am);
5900 am->counters[counter].min = min;
5901 am->counters[counter].max = max;
5902
5903 /* xmlFAGenerateTransitions(am, from, to, atom); */
5904 if (to == NULL) {
5905 to = xmlRegNewState(am);
5906 xmlRegStatePush(am, to);
5907 }
5908 xmlRegStateAddTrans(am, from, atom, to, counter, -1);
5909 xmlRegAtomPush(am, atom);
5910 am->state = to;
5911
5912 if (to == NULL)
5913 to = am->state;
5914 if (to == NULL)
5915 return(NULL);
5916 if (min == 0)
5917 xmlFAGenerateEpsilonTransition(am, from, to);
5918 return(to);
5919 }
5920
5921 /**
5922 * xmlAutomataNewCountTrans:
5923 * @am: an automata
5924 * @from: the starting point of the transition
5925 * @to: the target point of the transition or NULL
5926 * @token: the input string associated to that transition
5927 * @min: the minimum successive occurences of token
5928 * @max: the maximum successive occurences of token
5929 * @data: data associated to the transition
5930 *
5931 * If @to is NULL, this creates first a new target state in the automata
5932 * and then adds a transition from the @from state to the target state
5933 * activated by a succession of input of value @token and whose number
5934 * is between @min and @max
5935 *
5936 * Returns the target state or NULL in case of error
5937 */
5938 xmlAutomataStatePtr
5939 xmlAutomataNewCountTrans(xmlAutomataPtr am, xmlAutomataStatePtr from,
5940 xmlAutomataStatePtr to, const xmlChar *token,
5941 int min, int max, void *data) {
5942 xmlRegAtomPtr atom;
5943 int counter;
5944
5945 if ((am == NULL) || (from == NULL) || (token == NULL))
5946 return(NULL);
5947 if (min < 0)
5948 return(NULL);
5949 if ((max < min) || (max < 1))
5950 return(NULL);
5951 atom = xmlRegNewAtom(am, XML_REGEXP_STRING);
5952 if (atom == NULL)
5953 return(NULL);
5954 atom->valuep = xmlStrdup(token);
5955 atom->data = data;
5956 if (min == 0)
5957 atom->min = 1;
5958 else
5959 atom->min = min;
5960 atom->max = max;
5961
5962 /*
5963 * associate a counter to the transition.
5964 */
5965 counter = xmlRegGetCounter(am);
5966 am->counters[counter].min = min;
5967 am->counters[counter].max = max;
5968
5969 /* xmlFAGenerateTransitions(am, from, to, atom); */
5970 if (to == NULL) {
5971 to = xmlRegNewState(am);
5972 xmlRegStatePush(am, to);
5973 }
5974 xmlRegStateAddTrans(am, from, atom, to, counter, -1);
5975 xmlRegAtomPush(am, atom);
5976 am->state = to;
5977
5978 if (to == NULL)
5979 to = am->state;
5980 if (to == NULL)
5981 return(NULL);
5982 if (min == 0)
5983 xmlFAGenerateEpsilonTransition(am, from, to);
5984 return(to);
5985 }
5986
5987 /**
5988 * xmlAutomataNewOnceTrans2:
5989 * @am: an automata
5990 * @from: the starting point of the transition
5991 * @to: the target point of the transition or NULL
5992 * @token: the input string associated to that transition
5993 * @token2: the second input string associated to that transition
5994 * @min: the minimum successive occurences of token
5995 * @max: the maximum successive occurences of token
5996 * @data: data associated to the transition
5997 *
5998 * If @to is NULL, this creates first a new target state in the automata
5999 * and then adds a transition from the @from state to the target state
6000 * activated by a succession of input of value @token and @token2 and whose
6001 * number is between @min and @max, moreover that transition can only be
6002 * crossed once.
6003 *
6004 * Returns the target state or NULL in case of error
6005 */
6006 xmlAutomataStatePtr
6007 xmlAutomataNewOnceTrans2(xmlAutomataPtr am, xmlAutomataStatePtr from,
6008 xmlAutomataStatePtr to, const xmlChar *token,
6009 const xmlChar *token2,
6010 int min, int max, void *data) {
6011 xmlRegAtomPtr atom;
6012 int counter;
6013
6014 if ((am == NULL) || (from == NULL) || (token == NULL))
6015 return(NULL);
6016 if (min < 1)
6017 return(NULL);
6018 if ((max < min) || (max < 1))
6019 return(NULL);
6020 atom = xmlRegNewAtom(am, XML_REGEXP_STRING);
6021 if (atom == NULL)
6022 return(NULL);
6023 if ((token2 == NULL) || (*token2 == 0)) {
6024 atom->valuep = xmlStrdup(token);
6025 } else {
6026 int lenn, lenp;
6027 xmlChar *str;
6028
6029 lenn = strlen((char *) token2);
6030 lenp = strlen((char *) token);
6031
6032 str = (xmlChar *) xmlMallocAtomic(lenn + lenp + 2);
6033 if (str == NULL) {
6034 xmlRegFreeAtom(atom);
6035 return(NULL);
6036 }
6037 memcpy(&str[0], token, lenp);
6038 str[lenp] = '|';
6039 memcpy(&str[lenp + 1], token2, lenn);
6040 str[lenn + lenp + 1] = 0;
6041
6042 atom->valuep = str;
6043 }
6044 atom->data = data;
6045 atom->quant = XML_REGEXP_QUANT_ONCEONLY;
6046 atom->min = min;
6047 atom->max = max;
6048 /*
6049 * associate a counter to the transition.
6050 */
6051 counter = xmlRegGetCounter(am);
6052 am->counters[counter].min = 1;
6053 am->counters[counter].max = 1;
6054
6055 /* xmlFAGenerateTransitions(am, from, to, atom); */
6056 if (to == NULL) {
6057 to = xmlRegNewState(am);
6058 xmlRegStatePush(am, to);
6059 }
6060 xmlRegStateAddTrans(am, from, atom, to, counter, -1);
6061 xmlRegAtomPush(am, atom);
6062 am->state = to;
6063 return(to);
6064 }
6065
6066
6067
6068 /**
6069 * xmlAutomataNewOnceTrans:
6070 * @am: an automata
6071 * @from: the starting point of the transition
6072 * @to: the target point of the transition or NULL
6073 * @token: the input string associated to that transition
6074 * @min: the minimum successive occurences of token
6075 * @max: the maximum successive occurences of token
6076 * @data: data associated to the transition
6077 *
6078 * If @to is NULL, this creates first a new target state in the automata
6079 * and then adds a transition from the @from state to the target state
6080 * activated by a succession of input of value @token and whose number
6081 * is between @min and @max, moreover that transition can only be crossed
6082 * once.
6083 *
6084 * Returns the target state or NULL in case of error
6085 */
6086 xmlAutomataStatePtr
6087 xmlAutomataNewOnceTrans(xmlAutomataPtr am, xmlAutomataStatePtr from,
6088 xmlAutomataStatePtr to, const xmlChar *token,
6089 int min, int max, void *data) {
6090 xmlRegAtomPtr atom;
6091 int counter;
6092
6093 if ((am == NULL) || (from == NULL) || (token == NULL))
6094 return(NULL);
6095 if (min < 1)
6096 return(NULL);
6097 if ((max < min) || (max < 1))
6098 return(NULL);
6099 atom = xmlRegNewAtom(am, XML_REGEXP_STRING);
6100 if (atom == NULL)
6101 return(NULL);
6102 atom->valuep = xmlStrdup(token);
6103 atom->data = data;
6104 atom->quant = XML_REGEXP_QUANT_ONCEONLY;
6105 atom->min = min;
6106 atom->max = max;
6107 /*
6108 * associate a counter to the transition.
6109 */
6110 counter = xmlRegGetCounter(am);
6111 am->counters[counter].min = 1;
6112 am->counters[counter].max = 1;
6113
6114 /* xmlFAGenerateTransitions(am, from, to, atom); */
6115 if (to == NULL) {
6116 to = xmlRegNewState(am);
6117 xmlRegStatePush(am, to);
6118 }
6119 xmlRegStateAddTrans(am, from, atom, to, counter, -1);
6120 xmlRegAtomPush(am, atom);
6121 am->state = to;
6122 return(to);
6123 }
6124
6125 /**
6126 * xmlAutomataNewState:
6127 * @am: an automata
6128 *
6129 * Create a new disconnected state in the automata
6130 *
6131 * Returns the new state or NULL in case of error
6132 */
6133 xmlAutomataStatePtr
6134 xmlAutomataNewState(xmlAutomataPtr am) {
6135 xmlAutomataStatePtr to;
6136
6137 if (am == NULL)
6138 return(NULL);
6139 to = xmlRegNewState(am);
6140 xmlRegStatePush(am, to);
6141 return(to);
6142 }
6143
6144 /**
6145 * xmlAutomataNewEpsilon:
6146 * @am: an automata
6147 * @from: the starting point of the transition
6148 * @to: the target point of the transition or NULL
6149 *
6150 * If @to is NULL, this creates first a new target state in the automata
6151 * and then adds an epsilon transition from the @from state to the
6152 * target state
6153 *
6154 * Returns the target state or NULL in case of error
6155 */
6156 xmlAutomataStatePtr
6157 xmlAutomataNewEpsilon(xmlAutomataPtr am, xmlAutomataStatePtr from,
6158 xmlAutomataStatePtr to) {
6159 if ((am == NULL) || (from == NULL))
6160 return(NULL);
6161 xmlFAGenerateEpsilonTransition(am, from, to);
6162 if (to == NULL)
6163 return(am->state);
6164 return(to);
6165 }
6166
6167 /**
6168 * xmlAutomataNewAllTrans:
6169 * @am: an automata
6170 * @from: the starting point of the transition
6171 * @to: the target point of the transition or NULL
6172 * @lax: allow to transition if not all all transitions have been activated
6173 *
6174 * If @to is NULL, this creates first a new target state in the automata
6175 * and then adds a an ALL transition from the @from state to the
6176 * target state. That transition is an epsilon transition allowed only when
6177 * all transitions from the @from node have been activated.
6178 *
6179 * Returns the target state or NULL in case of error
6180 */
6181 xmlAutomataStatePtr
6182 xmlAutomataNewAllTrans(xmlAutomataPtr am, xmlAutomataStatePtr from,
6183 xmlAutomataStatePtr to, int lax) {
6184 if ((am == NULL) || (from == NULL))
6185 return(NULL);
6186 xmlFAGenerateAllTransition(am, from, to, lax);
6187 if (to == NULL)
6188 return(am->state);
6189 return(to);
6190 }
6191
6192 /**
6193 * xmlAutomataNewCounter:
6194 * @am: an automata
6195 * @min: the minimal value on the counter
6196 * @max: the maximal value on the counter
6197 *
6198 * Create a new counter
6199 *
6200 * Returns the counter number or -1 in case of error
6201 */
6202 int
6203 xmlAutomataNewCounter(xmlAutomataPtr am, int min, int max) {
6204 int ret;
6205
6206 if (am == NULL)
6207 return(-1);
6208
6209 ret = xmlRegGetCounter(am);
6210 if (ret < 0)
6211 return(-1);
6212 am->counters[ret].min = min;
6213 am->counters[ret].max = max;
6214 return(ret);
6215 }
6216
6217 /**
6218 * xmlAutomataNewCountedTrans:
6219 * @am: an automata
6220 * @from: the starting point of the transition
6221 * @to: the target point of the transition or NULL
6222 * @counter: the counter associated to that transition
6223 *
6224 * If @to is NULL, this creates first a new target state in the automata
6225 * and then adds an epsilon transition from the @from state to the target state
6226 * which will increment the counter provided
6227 *
6228 * Returns the target state or NULL in case of error
6229 */
6230 xmlAutomataStatePtr
6231 xmlAutomataNewCountedTrans(xmlAutomataPtr am, xmlAutomataStatePtr from,
6232 xmlAutomataStatePtr to, int counter) {
6233 if ((am == NULL) || (from == NULL) || (counter < 0))
6234 return(NULL);
6235 xmlFAGenerateCountedEpsilonTransition(am, from, to, counter);
6236 if (to == NULL)
6237 return(am->state);
6238 return(to);
6239 }
6240
6241 /**
6242 * xmlAutomataNewCounterTrans:
6243 * @am: an automata
6244 * @from: the starting point of the transition
6245 * @to: the target point of the transition or NULL
6246 * @counter: the counter associated to that transition
6247 *
6248 * If @to is NULL, this creates first a new target state in the automata
6249 * and then adds an epsilon transition from the @from state to the target state
6250 * which will be allowed only if the counter is within the right range.
6251 *
6252 * Returns the target state or NULL in case of error
6253 */
6254 xmlAutomataStatePtr
6255 xmlAutomataNewCounterTrans(xmlAutomataPtr am, xmlAutomataStatePtr from,
6256 xmlAutomataStatePtr to, int counter) {
6257 if ((am == NULL) || (from == NULL) || (counter < 0))
6258 return(NULL);
6259 xmlFAGenerateCountedTransition(am, from, to, counter);
6260 if (to == NULL)
6261 return(am->state);
6262 return(to);
6263 }
6264
6265 /**
6266 * xmlAutomataCompile:
6267 * @am: an automata
6268 *
6269 * Compile the automata into a Reg Exp ready for being executed.
6270 * The automata should be free after this point.
6271 *
6272 * Returns the compiled regexp or NULL in case of error
6273 */
6274 xmlRegexpPtr
6275 xmlAutomataCompile(xmlAutomataPtr am) {
6276 xmlRegexpPtr ret;
6277
6278 if ((am == NULL) || (am->error != 0)) return(NULL);
6279 xmlFAEliminateEpsilonTransitions(am);
6280 /* xmlFAComputesDeterminism(am); */
6281 ret = xmlRegEpxFromParse(am);
6282
6283 return(ret);
6284 }
6285
6286 /**
6287 * xmlAutomataIsDeterminist:
6288 * @am: an automata
6289 *
6290 * Checks if an automata is determinist.
6291 *
6292 * Returns 1 if true, 0 if not, and -1 in case of error
6293 */
6294 int
6295 xmlAutomataIsDeterminist(xmlAutomataPtr am) {
6296 int ret;
6297
6298 if (am == NULL)
6299 return(-1);
6300
6301 ret = xmlFAComputesDeterminism(am);
6302 return(ret);
6303 }
6304 #endif /* LIBXML_AUTOMATA_ENABLED */
6305
6306 #ifdef LIBXML_EXPR_ENABLED
6307 /************************************************************************
6308 * *
6309 * Formal Expression handling code *
6310 * *
6311 ************************************************************************/
6312 /************************************************************************
6313 * *
6314 * Expression handling context *
6315 * *
6316 ************************************************************************/
6317
6318 struct _xmlExpCtxt {
6319 xmlDictPtr dict;
6320 xmlExpNodePtr *table;
6321 int size;
6322 int nbElems;
6323 int nb_nodes;
6324 int maxNodes;
6325 const char *expr;
6326 const char *cur;
6327 int nb_cons;
6328 int tabSize;
6329 };
6330
6331 /**
6332 * xmlExpNewCtxt:
6333 * @maxNodes: the maximum number of nodes
6334 * @dict: optional dictionnary to use internally
6335 *
6336 * Creates a new context for manipulating expressions
6337 *
6338 * Returns the context or NULL in case of error
6339 */
6340 xmlExpCtxtPtr
6341 xmlExpNewCtxt(int maxNodes, xmlDictPtr dict) {
6342 xmlExpCtxtPtr ret;
6343 int size = 256;
6344
6345 if (maxNodes <= 4096)
6346 maxNodes = 4096;
6347
6348 ret = (xmlExpCtxtPtr) xmlMalloc(sizeof(xmlExpCtxt));
6349 if (ret == NULL)
6350 return(NULL);
6351 memset(ret, 0, sizeof(xmlExpCtxt));
6352 ret->size = size;
6353 ret->nbElems = 0;
6354 ret->maxNodes = maxNodes;
6355 ret->table = xmlMalloc(size * sizeof(xmlExpNodePtr));
6356 if (ret->table == NULL) {
6357 xmlFree(ret);
6358 return(NULL);
6359 }
6360 memset(ret->table, 0, size * sizeof(xmlExpNodePtr));
6361 if (dict == NULL) {
6362 ret->dict = xmlDictCreate();
6363 if (ret->dict == NULL) {
6364 xmlFree(ret->table);
6365 xmlFree(ret);
6366 return(NULL);
6367 }
6368 } else {
6369 ret->dict = dict;
6370 xmlDictReference(ret->dict);
6371 }
6372 return(ret);
6373 }
6374
6375 /**
6376 * xmlExpFreeCtxt:
6377 * @ctxt: an expression context
6378 *
6379 * Free an expression context
6380 */
6381 void
6382 xmlExpFreeCtxt(xmlExpCtxtPtr ctxt) {
6383 if (ctxt == NULL)
6384 return;
6385 xmlDictFree(ctxt->dict);
6386 if (ctxt->table != NULL)
6387 xmlFree(ctxt->table);
6388 xmlFree(ctxt);
6389 }
6390
6391 /************************************************************************
6392 * *
6393 * Structure associated to an expression node *
6394 * *
6395 ************************************************************************/
6396 #define MAX_NODES 10000
6397
6398 /* #define DEBUG_DERIV */
6399
6400 /*
6401 * TODO:
6402 * - Wildcards
6403 * - public API for creation
6404 *
6405 * Started
6406 * - regression testing
6407 *
6408 * Done
6409 * - split into module and test tool
6410 * - memleaks
6411 */
6412
6413 typedef enum {
6414 XML_EXP_NILABLE = (1 << 0)
6415 } xmlExpNodeInfo;
6416
6417 #define IS_NILLABLE(node) ((node)->info & XML_EXP_NILABLE)
6418
6419 struct _xmlExpNode {
6420 unsigned char type;/* xmlExpNodeType */
6421 unsigned char info;/* OR of xmlExpNodeInfo */
6422 unsigned short key; /* the hash key */
6423 unsigned int ref; /* The number of references */
6424 int c_max; /* the maximum length it can consume */
6425 xmlExpNodePtr exp_left;
6426 xmlExpNodePtr next;/* the next node in the hash table or free list */
6427 union {
6428 struct {
6429 int f_min;
6430 int f_max;
6431 } count;
6432 struct {
6433 xmlExpNodePtr f_right;
6434 } children;
6435 const xmlChar *f_str;
6436 } field;
6437 };
6438
6439 #define exp_min field.count.f_min
6440 #define exp_max field.count.f_max
6441 /* #define exp_left field.children.f_left */
6442 #define exp_right field.children.f_right
6443 #define exp_str field.f_str
6444
6445 static xmlExpNodePtr xmlExpNewNode(xmlExpCtxtPtr ctxt, xmlExpNodeType type);
6446 static xmlExpNode forbiddenExpNode = {
6447 XML_EXP_FORBID, 0, 0, 0, 0, NULL, NULL, {{ 0, 0}}
6448 };
6449 xmlExpNodePtr forbiddenExp = &forbiddenExpNode;
6450 static xmlExpNode emptyExpNode = {
6451 XML_EXP_EMPTY, 1, 0, 0, 0, NULL, NULL, {{ 0, 0}}
6452 };
6453 xmlExpNodePtr emptyExp = &emptyExpNode;
6454
6455 /************************************************************************
6456 * *
6457 * The custom hash table for unicity and canonicalization *
6458 * of sub-expressions pointers *
6459 * *
6460 ************************************************************************/
6461 /*
6462 * xmlExpHashNameComputeKey:
6463 * Calculate the hash key for a token
6464 */
6465 static unsigned short
6466 xmlExpHashNameComputeKey(const xmlChar *name) {
6467 unsigned short value = 0L;
6468 char ch;
6469
6470 if (name != NULL) {
6471 value += 30 * (*name);
6472 while ((ch = *name++) != 0) {
6473 value = value ^ ((value << 5) + (value >> 3) + (unsigned short)ch);
6474 }
6475 }
6476 return (value);
6477 }
6478
6479 /*
6480 * xmlExpHashComputeKey:
6481 * Calculate the hash key for a compound expression
6482 */
6483 static unsigned short
6484 xmlExpHashComputeKey(xmlExpNodeType type, xmlExpNodePtr left,
6485 xmlExpNodePtr right) {
6486 unsigned long value;
6487 unsigned short ret;
6488
6489 switch (type) {
6490 case XML_EXP_SEQ:
6491 value = left->key;
6492 value += right->key;
6493 value *= 3;
6494 ret = (unsigned short) value;
6495 break;
6496 case XML_EXP_OR:
6497 value = left->key;
6498 value += right->key;
6499 value *= 7;
6500 ret = (unsigned short) value;
6501 break;
6502 case XML_EXP_COUNT:
6503 value = left->key;
6504 value += right->key;
6505 ret = (unsigned short) value;
6506 break;
6507 default:
6508 ret = 0;
6509 }
6510 return(ret);
6511 }
6512
6513
6514 static xmlExpNodePtr
6515 xmlExpNewNode(xmlExpCtxtPtr ctxt, xmlExpNodeType type) {
6516 xmlExpNodePtr ret;
6517
6518 if (ctxt->nb_nodes >= MAX_NODES)
6519 return(NULL);
6520 ret = (xmlExpNodePtr) xmlMalloc(sizeof(xmlExpNode));
6521 if (ret == NULL)
6522 return(NULL);
6523 memset(ret, 0, sizeof(xmlExpNode));
6524 ret->type = type;
6525 ret->next = NULL;
6526 ctxt->nb_nodes++;
6527 ctxt->nb_cons++;
6528 return(ret);
6529 }
6530
6531 /**
6532 * xmlExpHashGetEntry:
6533 * @table: the hash table
6534 *
6535 * Get the unique entry from the hash table. The entry is created if
6536 * needed. @left and @right are consumed, i.e. their ref count will
6537 * be decremented by the operation.
6538 *
6539 * Returns the pointer or NULL in case of error
6540 */
6541 static xmlExpNodePtr
6542 xmlExpHashGetEntry(xmlExpCtxtPtr ctxt, xmlExpNodeType type,
6543 xmlExpNodePtr left, xmlExpNodePtr right,
6544 const xmlChar *name, int min, int max) {
6545 unsigned short kbase, key;
6546 xmlExpNodePtr entry;
6547 xmlExpNodePtr insert;
6548
6549 if (ctxt == NULL)
6550 return(NULL);
6551
6552 /*
6553 * Check for duplicate and insertion location.
6554 */
6555 if (type == XML_EXP_ATOM) {
6556 kbase = xmlExpHashNameComputeKey(name);
6557 } else if (type == XML_EXP_COUNT) {
6558 /* COUNT reduction rule 1 */
6559 /* a{1} -> a */
6560 if (min == max) {
6561 if (min == 1) {
6562 return(left);
6563 }
6564 if (min == 0) {
6565 xmlExpFree(ctxt, left);
6566 return(emptyExp);
6567 }
6568 }
6569 if (min < 0) {
6570 xmlExpFree(ctxt, left);
6571 return(forbiddenExp);
6572 }
6573 if (max == -1)
6574 kbase = min + 79;
6575 else
6576 kbase = max - min;
6577 kbase += left->key;
6578 } else if (type == XML_EXP_OR) {
6579 /* Forbid reduction rules */
6580 if (left->type == XML_EXP_FORBID) {
6581 xmlExpFree(ctxt, left);
6582 return(right);
6583 }
6584 if (right->type == XML_EXP_FORBID) {
6585 xmlExpFree(ctxt, right);
6586 return(left);
6587 }
6588
6589 /* OR reduction rule 1 */
6590 /* a | a reduced to a */
6591 if (left == right) {
6592 left->ref--;
6593 return(left);
6594 }
6595 /* OR canonicalization rule 1 */
6596 /* linearize (a | b) | c into a | (b | c) */
6597 if ((left->type == XML_EXP_OR) && (right->type != XML_EXP_OR)) {
6598 xmlExpNodePtr tmp = left;
6599 left = right;
6600 right = tmp;
6601 }
6602 /* OR reduction rule 2 */
6603 /* a | (a | b) and b | (a | b) are reduced to a | b */
6604 if (right->type == XML_EXP_OR) {
6605 if ((left == right->exp_left) ||
6606 (left == right->exp_right)) {
6607 xmlExpFree(ctxt, left);
6608 return(right);
6609 }
6610 }
6611 /* OR canonicalization rule 2 */
6612 /* linearize (a | b) | c into a | (b | c) */
6613 if (left->type == XML_EXP_OR) {
6614 xmlExpNodePtr tmp;
6615
6616 /* OR canonicalization rule 2 */
6617 if ((left->exp_right->type != XML_EXP_OR) &&
6618 (left->exp_right->key < left->exp_left->key)) {
6619 tmp = left->exp_right;
6620 left->exp_right = left->exp_left;
6621 left->exp_left = tmp;
6622 }
6623 left->exp_right->ref++;
6624 tmp = xmlExpHashGetEntry(ctxt, XML_EXP_OR, left->exp_right, right,
6625 NULL, 0, 0);
6626 left->exp_left->ref++;
6627 tmp = xmlExpHashGetEntry(ctxt, XML_EXP_OR, left->exp_left, tmp,
6628 NULL, 0, 0);
6629
6630 xmlExpFree(ctxt, left);
6631 return(tmp);
6632 }
6633 if (right->type == XML_EXP_OR) {
6634 /* Ordering in the tree */
6635 /* C | (A | B) -> A | (B | C) */
6636 if (left->key > right->exp_right->key) {
6637 xmlExpNodePtr tmp;
6638 right->exp_right->ref++;
6639 tmp = xmlExpHashGetEntry(ctxt, XML_EXP_OR, right->exp_right,
6640 left, NULL, 0, 0);
6641 right->exp_left->ref++;
6642 tmp = xmlExpHashGetEntry(ctxt, XML_EXP_OR, right->exp_left,
6643 tmp, NULL, 0, 0);
6644 xmlExpFree(ctxt, right);
6645 return(tmp);
6646 }
6647 /* Ordering in the tree */
6648 /* B | (A | C) -> A | (B | C) */
6649 if (left->key > right->exp_left->key) {
6650 xmlExpNodePtr tmp;
6651 right->exp_right->ref++;
6652 tmp = xmlExpHashGetEntry(ctxt, XML_EXP_OR, left,
6653 right->exp_right, NULL, 0, 0);
6654 right->exp_left->ref++;
6655 tmp = xmlExpHashGetEntry(ctxt, XML_EXP_OR, right->exp_left,
6656 tmp, NULL, 0, 0);
6657 xmlExpFree(ctxt, right);
6658 return(tmp);
6659 }
6660 }
6661 /* we know both types are != XML_EXP_OR here */
6662 else if (left->key > right->key) {
6663 xmlExpNodePtr tmp = left;
6664 left = right;
6665 right = tmp;
6666 }
6667 kbase = xmlExpHashComputeKey(type, left, right);
6668 } else if (type == XML_EXP_SEQ) {
6669 /* Forbid reduction rules */
6670 if (left->type == XML_EXP_FORBID) {
6671 xmlExpFree(ctxt, right);
6672 return(left);
6673 }
6674 if (right->type == XML_EXP_FORBID) {
6675 xmlExpFree(ctxt, left);
6676 return(right);
6677 }
6678 /* Empty reduction rules */
6679 if (right->type == XML_EXP_EMPTY) {
6680 return(left);
6681 }
6682 if (left->type == XML_EXP_EMPTY) {
6683 return(right);
6684 }
6685 kbase = xmlExpHashComputeKey(type, left, right);
6686 } else
6687 return(NULL);
6688
6689 key = kbase % ctxt->size;
6690 if (ctxt->table[key] != NULL) {
6691 for (insert = ctxt->table[key]; insert != NULL;
6692 insert = insert->next) {
6693 if ((insert->key == kbase) &&
6694 (insert->type == type)) {
6695 if (type == XML_EXP_ATOM) {
6696 if (name == insert->exp_str) {
6697 insert->ref++;
6698 return(insert);
6699 }
6700 } else if (type == XML_EXP_COUNT) {
6701 if ((insert->exp_min == min) && (insert->exp_max == max) &&
6702 (insert->exp_left == left)) {
6703 insert->ref++;
6704 left->ref--;
6705 return(insert);
6706 }
6707 } else if ((insert->exp_left == left) &&
6708 (insert->exp_right == right)) {
6709 insert->ref++;
6710 left->ref--;
6711 right->ref--;
6712 return(insert);
6713 }
6714 }
6715 }
6716 }
6717
6718 entry = xmlExpNewNode(ctxt, type);
6719 if (entry == NULL)
6720 return(NULL);
6721 entry->key = kbase;
6722 if (type == XML_EXP_ATOM) {
6723 entry->exp_str = name;
6724 entry->c_max = 1;
6725 } else if (type == XML_EXP_COUNT) {
6726 entry->exp_min = min;
6727 entry->exp_max = max;
6728 entry->exp_left = left;
6729 if ((min == 0) || (IS_NILLABLE(left)))
6730 entry->info |= XML_EXP_NILABLE;
6731 if (max < 0)
6732 entry->c_max = -1;
6733 else
6734 entry->c_max = max * entry->exp_left->c_max;
6735 } else {
6736 entry->exp_left = left;
6737 entry->exp_right = right;
6738 if (type == XML_EXP_OR) {
6739 if ((IS_NILLABLE(left)) || (IS_NILLABLE(right)))
6740 entry->info |= XML_EXP_NILABLE;
6741 if ((entry->exp_left->c_max == -1) ||
6742 (entry->exp_right->c_max == -1))
6743 entry->c_max = -1;
6744 else if (entry->exp_left->c_max > entry->exp_right->c_max)
6745 entry->c_max = entry->exp_left->c_max;
6746 else
6747 entry->c_max = entry->exp_right->c_max;
6748 } else {
6749 if ((IS_NILLABLE(left)) && (IS_NILLABLE(right)))
6750 entry->info |= XML_EXP_NILABLE;
6751 if ((entry->exp_left->c_max == -1) ||
6752 (entry->exp_right->c_max == -1))
6753 entry->c_max = -1;
6754 else
6755 entry->c_max = entry->exp_left->c_max + entry->exp_right->c_max;
6756 }
6757 }
6758 entry->ref = 1;
6759 if (ctxt->table[key] != NULL)
6760 entry->next = ctxt->table[key];
6761
6762 ctxt->table[key] = entry;
6763 ctxt->nbElems++;
6764
6765 return(entry);
6766 }
6767
6768 /**
6769 * xmlExpFree:
6770 * @ctxt: the expression context
6771 * @exp: the expression
6772 *
6773 * Dereference the expression
6774 */
6775 void
6776 xmlExpFree(xmlExpCtxtPtr ctxt, xmlExpNodePtr exp) {
6777 if ((exp == NULL) || (exp == forbiddenExp) || (exp == emptyExp))
6778 return;
6779 exp->ref--;
6780 if (exp->ref == 0) {
6781 unsigned short key;
6782
6783 /* Unlink it first from the hash table */
6784 key = exp->key % ctxt->size;
6785 if (ctxt->table[key] == exp) {
6786 ctxt->table[key] = exp->next;
6787 } else {
6788 xmlExpNodePtr tmp;
6789
6790 tmp = ctxt->table[key];
6791 while (tmp != NULL) {
6792 if (tmp->next == exp) {
6793 tmp->next = exp->next;
6794 break;
6795 }
6796 tmp = tmp->next;
6797 }
6798 }
6799
6800 if ((exp->type == XML_EXP_SEQ) || (exp->type == XML_EXP_OR)) {
6801 xmlExpFree(ctxt, exp->exp_left);
6802 xmlExpFree(ctxt, exp->exp_right);
6803 } else if (exp->type == XML_EXP_COUNT) {
6804 xmlExpFree(ctxt, exp->exp_left);
6805 }
6806 xmlFree(exp);
6807 ctxt->nb_nodes--;
6808 }
6809 }
6810
6811 /**
6812 * xmlExpRef:
6813 * @exp: the expression
6814 *
6815 * Increase the reference count of the expression
6816 */
6817 void
6818 xmlExpRef(xmlExpNodePtr exp) {
6819 if (exp != NULL)
6820 exp->ref++;
6821 }
6822
6823 /**
6824 * xmlExpNewAtom:
6825 * @ctxt: the expression context
6826 * @name: the atom name
6827 * @len: the atom name lenght in byte (or -1);
6828 *
6829 * Get the atom associated to this name from that context
6830 *
6831 * Returns the node or NULL in case of error
6832 */
6833 xmlExpNodePtr
6834 xmlExpNewAtom(xmlExpCtxtPtr ctxt, const xmlChar *name, int len) {
6835 if ((ctxt == NULL) || (name == NULL))
6836 return(NULL);
6837 name = xmlDictLookup(ctxt->dict, name, len);
6838 if (name == NULL)
6839 return(NULL);
6840 return(xmlExpHashGetEntry(ctxt, XML_EXP_ATOM, NULL, NULL, name, 0, 0));
6841 }
6842
6843 /**
6844 * xmlExpNewOr:
6845 * @ctxt: the expression context
6846 * @left: left expression
6847 * @right: right expression
6848 *
6849 * Get the atom associated to the choice @left | @right
6850 * Note that @left and @right are consumed in the operation, to keep
6851 * an handle on them use xmlExpRef() and use xmlExpFree() to release them,
6852 * this is true even in case of failure (unless ctxt == NULL).
6853 *
6854 * Returns the node or NULL in case of error
6855 */
6856 xmlExpNodePtr
6857 xmlExpNewOr(xmlExpCtxtPtr ctxt, xmlExpNodePtr left, xmlExpNodePtr right) {
6858 if (ctxt == NULL)
6859 return(NULL);
6860 if ((left == NULL) || (right == NULL)) {
6861 xmlExpFree(ctxt, left);
6862 xmlExpFree(ctxt, right);
6863 return(NULL);
6864 }
6865 return(xmlExpHashGetEntry(ctxt, XML_EXP_OR, left, right, NULL, 0, 0));
6866 }
6867
6868 /**
6869 * xmlExpNewSeq:
6870 * @ctxt: the expression context
6871 * @left: left expression
6872 * @right: right expression
6873 *
6874 * Get the atom associated to the sequence @left , @right
6875 * Note that @left and @right are consumed in the operation, to keep
6876 * an handle on them use xmlExpRef() and use xmlExpFree() to release them,
6877 * this is true even in case of failure (unless ctxt == NULL).
6878 *
6879 * Returns the node or NULL in case of error
6880 */
6881 xmlExpNodePtr
6882 xmlExpNewSeq(xmlExpCtxtPtr ctxt, xmlExpNodePtr left, xmlExpNodePtr right) {
6883 if (ctxt == NULL)
6884 return(NULL);
6885 if ((left == NULL) || (right == NULL)) {
6886 xmlExpFree(ctxt, left);
6887 xmlExpFree(ctxt, right);
6888 return(NULL);
6889 }
6890 return(xmlExpHashGetEntry(ctxt, XML_EXP_SEQ, left, right, NULL, 0, 0));
6891 }
6892
6893 /**
6894 * xmlExpNewRange:
6895 * @ctxt: the expression context
6896 * @subset: the expression to be repeated
6897 * @min: the lower bound for the repetition
6898 * @max: the upper bound for the repetition, -1 means infinite
6899 *
6900 * Get the atom associated to the range (@subset){@min, @max}
6901 * Note that @subset is consumed in the operation, to keep
6902 * an handle on it use xmlExpRef() and use xmlExpFree() to release it,
6903 * this is true even in case of failure (unless ctxt == NULL).
6904 *
6905 * Returns the node or NULL in case of error
6906 */
6907 xmlExpNodePtr
6908 xmlExpNewRange(xmlExpCtxtPtr ctxt, xmlExpNodePtr subset, int min, int max) {
6909 if (ctxt == NULL)
6910 return(NULL);
6911 if ((subset == NULL) || (min < 0) || (max < -1) ||
6912 ((max >= 0) && (min > max))) {
6913 xmlExpFree(ctxt, subset);
6914 return(NULL);
6915 }
6916 return(xmlExpHashGetEntry(ctxt, XML_EXP_COUNT, subset,
6917 NULL, NULL, min, max));
6918 }
6919
6920 /************************************************************************
6921 * *
6922 * Public API for operations on expressions *
6923 * *
6924 ************************************************************************/
6925
6926 static int
6927 xmlExpGetLanguageInt(xmlExpCtxtPtr ctxt, xmlExpNodePtr exp,
6928 const xmlChar**list, int len, int nb) {
6929 int tmp, tmp2;
6930 tail:
6931 switch (exp->type) {
6932 case XML_EXP_EMPTY:
6933 return(0);
6934 case XML_EXP_ATOM:
6935 for (tmp = 0;tmp < nb;tmp++)
6936 if (list[tmp] == exp->exp_str)
6937 return(0);
6938 if (nb >= len)
6939 return(-2);
6940 list[nb] = exp->exp_str;
6941 return(1);
6942 case XML_EXP_COUNT:
6943 exp = exp->exp_left;
6944 goto tail;
6945 case XML_EXP_SEQ:
6946 case XML_EXP_OR:
6947 tmp = xmlExpGetLanguageInt(ctxt, exp->exp_left, list, len, nb);
6948 if (tmp < 0)
6949 return(tmp);
6950 tmp2 = xmlExpGetLanguageInt(ctxt, exp->exp_right, list, len,
6951 nb + tmp);
6952 if (tmp2 < 0)
6953 return(tmp2);
6954 return(tmp + tmp2);
6955 }
6956 return(-1);
6957 }
6958
6959 /**
6960 * xmlExpGetLanguage:
6961 * @ctxt: the expression context
6962 * @exp: the expression
6963 * @langList: where to store the tokens
6964 * @len: the allocated lenght of @list
6965 *
6966 * Find all the strings used in @exp and store them in @list
6967 *
6968 * Returns the number of unique strings found, -1 in case of errors and
6969 * -2 if there is more than @len strings
6970 */
6971 int
6972 xmlExpGetLanguage(xmlExpCtxtPtr ctxt, xmlExpNodePtr exp,
6973 const xmlChar**langList, int len) {
6974 if ((ctxt == NULL) || (exp == NULL) || (langList == NULL) || (len <= 0))
6975 return(-1);
6976 return(xmlExpGetLanguageInt(ctxt, exp, langList, len, 0));
6977 }
6978
6979 static int
6980 xmlExpGetStartInt(xmlExpCtxtPtr ctxt, xmlExpNodePtr exp,
6981 const xmlChar**list, int len, int nb) {
6982 int tmp, tmp2;
6983 tail:
6984 switch (exp->type) {
6985 case XML_EXP_FORBID:
6986 return(0);
6987 case XML_EXP_EMPTY:
6988 return(0);
6989 case XML_EXP_ATOM:
6990 for (tmp = 0;tmp < nb;tmp++)
6991 if (list[tmp] == exp->exp_str)
6992 return(0);
6993 if (nb >= len)
6994 return(-2);
6995 list[nb] = exp->exp_str;
6996 return(1);
6997 case XML_EXP_COUNT:
6998 exp = exp->exp_left;
6999 goto tail;
7000 case XML_EXP_SEQ:
7001 tmp = xmlExpGetStartInt(ctxt, exp->exp_left, list, len, nb);
7002 if (tmp < 0)
7003 return(tmp);
7004 if (IS_NILLABLE(exp->exp_left)) {
7005 tmp2 = xmlExpGetStartInt(ctxt, exp->exp_right, list, len,
7006 nb + tmp);
7007 if (tmp2 < 0)
7008 return(tmp2);
7009 tmp += tmp2;
7010 }
7011 return(tmp);
7012 case XML_EXP_OR:
7013 tmp = xmlExpGetStartInt(ctxt, exp->exp_left, list, len, nb);
7014 if (tmp < 0)
7015 return(tmp);
7016 tmp2 = xmlExpGetStartInt(ctxt, exp->exp_right, list, len,
7017 nb + tmp);
7018 if (tmp2 < 0)
7019 return(tmp2);
7020 return(tmp + tmp2);
7021 }
7022 return(-1);
7023 }
7024
7025 /**
7026 * xmlExpGetStart:
7027 * @ctxt: the expression context
7028 * @exp: the expression
7029 * @tokList: where to store the tokens
7030 * @len: the allocated lenght of @list
7031 *
7032 * Find all the strings that appears at the start of the languages
7033 * accepted by @exp and store them in @list. E.g. for (a, b) | c
7034 * it will return the list [a, c]
7035 *
7036 * Returns the number of unique strings found, -1 in case of errors and
7037 * -2 if there is more than @len strings
7038 */
7039 int
7040 xmlExpGetStart(xmlExpCtxtPtr ctxt, xmlExpNodePtr exp,
7041 const xmlChar**tokList, int len) {
7042 if ((ctxt == NULL) || (exp == NULL) || (tokList == NULL) || (len <= 0))
7043 return(-1);
7044 return(xmlExpGetStartInt(ctxt, exp, tokList, len, 0));
7045 }
7046
7047 /**
7048 * xmlExpIsNillable:
7049 * @exp: the expression
7050 *
7051 * Finds if the expression is nillable, i.e. if it accepts the empty sequqnce
7052 *
7053 * Returns 1 if nillable, 0 if not and -1 in case of error
7054 */
7055 int
7056 xmlExpIsNillable(xmlExpNodePtr exp) {
7057 if (exp == NULL)
7058 return(-1);
7059 return(IS_NILLABLE(exp) != 0);
7060 }
7061
7062 static xmlExpNodePtr
7063 xmlExpStringDeriveInt(xmlExpCtxtPtr ctxt, xmlExpNodePtr exp, const xmlChar *str)
7064 {
7065 xmlExpNodePtr ret;
7066
7067 switch (exp->type) {
7068 case XML_EXP_EMPTY:
7069 return(forbiddenExp);
7070 case XML_EXP_FORBID:
7071 return(forbiddenExp);
7072 case XML_EXP_ATOM:
7073 if (exp->exp_str == str) {
7074 #ifdef DEBUG_DERIV
7075 printf("deriv atom: equal => Empty\n");
7076 #endif
7077 ret = emptyExp;
7078 } else {
7079 #ifdef DEBUG_DERIV
7080 printf("deriv atom: mismatch => forbid\n");
7081 #endif
7082 /* TODO wildcards here */
7083 ret = forbiddenExp;
7084 }
7085 return(ret);
7086 case XML_EXP_OR: {
7087 xmlExpNodePtr tmp;
7088
7089 #ifdef DEBUG_DERIV
7090 printf("deriv or: => or(derivs)\n");
7091 #endif
7092 tmp = xmlExpStringDeriveInt(ctxt, exp->exp_left, str);
7093 if (tmp == NULL) {
7094 return(NULL);
7095 }
7096 ret = xmlExpStringDeriveInt(ctxt, exp->exp_right, str);
7097 if (ret == NULL) {
7098 xmlExpFree(ctxt, tmp);
7099 return(NULL);
7100 }
7101 ret = xmlExpHashGetEntry(ctxt, XML_EXP_OR, tmp, ret,
7102 NULL, 0, 0);
7103 return(ret);
7104 }
7105 case XML_EXP_SEQ:
7106 #ifdef DEBUG_DERIV
7107 printf("deriv seq: starting with left\n");
7108 #endif
7109 ret = xmlExpStringDeriveInt(ctxt, exp->exp_left, str);
7110 if (ret == NULL) {
7111 return(NULL);
7112 } else if (ret == forbiddenExp) {
7113 if (IS_NILLABLE(exp->exp_left)) {
7114 #ifdef DEBUG_DERIV
7115 printf("deriv seq: left failed but nillable\n");
7116 #endif
7117 ret = xmlExpStringDeriveInt(ctxt, exp->exp_right, str);
7118 }
7119 } else {
7120 #ifdef DEBUG_DERIV
7121 printf("deriv seq: left match => sequence\n");
7122 #endif
7123 exp->exp_right->ref++;
7124 ret = xmlExpHashGetEntry(ctxt, XML_EXP_SEQ, ret, exp->exp_right,
7125 NULL, 0, 0);
7126 }
7127 return(ret);
7128 case XML_EXP_COUNT: {
7129 int min, max;
7130 xmlExpNodePtr tmp;
7131
7132 if (exp->exp_max == 0)
7133 return(forbiddenExp);
7134 ret = xmlExpStringDeriveInt(ctxt, exp->exp_left, str);
7135 if (ret == NULL)
7136 return(NULL);
7137 if (ret == forbiddenExp) {
7138 #ifdef DEBUG_DERIV
7139 printf("deriv count: pattern mismatch => forbid\n");
7140 #endif
7141 return(ret);
7142 }
7143 if (exp->exp_max == 1)
7144 return(ret);
7145 if (exp->exp_max < 0) /* unbounded */
7146 max = -1;
7147 else
7148 max = exp->exp_max - 1;
7149 if (exp->exp_min > 0)
7150 min = exp->exp_min - 1;
7151 else
7152 min = 0;
7153 exp->exp_left->ref++;
7154 tmp = xmlExpHashGetEntry(ctxt, XML_EXP_COUNT, exp->exp_left, NULL,
7155 NULL, min, max);
7156 if (ret == emptyExp) {
7157 #ifdef DEBUG_DERIV
7158 printf("deriv count: match to empty => new count\n");
7159 #endif
7160 return(tmp);
7161 }
7162 #ifdef DEBUG_DERIV
7163 printf("deriv count: match => sequence with new count\n");
7164 #endif
7165 return(xmlExpHashGetEntry(ctxt, XML_EXP_SEQ, ret, tmp,
7166 NULL, 0, 0));
7167 }
7168 }
7169 return(NULL);
7170 }
7171
7172 /**
7173 * xmlExpStringDerive:
7174 * @ctxt: the expression context
7175 * @exp: the expression
7176 * @str: the string
7177 * @len: the string len in bytes if available
7178 *
7179 * Do one step of Brzozowski derivation of the expression @exp with
7180 * respect to the input string
7181 *
7182 * Returns the resulting expression or NULL in case of internal error
7183 */
7184 xmlExpNodePtr
7185 xmlExpStringDerive(xmlExpCtxtPtr ctxt, xmlExpNodePtr exp,
7186 const xmlChar *str, int len) {
7187 const xmlChar *input;
7188
7189 if ((exp == NULL) || (ctxt == NULL) || (str == NULL)) {
7190 return(NULL);
7191 }
7192 /*
7193 * check the string is in the dictionnary, if yes use an interned
7194 * copy, otherwise we know it's not an acceptable input
7195 */
7196 input = xmlDictExists(ctxt->dict, str, len);
7197 if (input == NULL) {
7198 return(forbiddenExp);
7199 }
7200 return(xmlExpStringDeriveInt(ctxt, exp, input));
7201 }
7202
7203 static int
7204 xmlExpCheckCard(xmlExpNodePtr exp, xmlExpNodePtr sub) {
7205 int ret = 1;
7206
7207 if (sub->c_max == -1) {
7208 if (exp->c_max != -1)
7209 ret = 0;
7210 } else if ((exp->c_max >= 0) && (exp->c_max < sub->c_max)) {
7211 ret = 0;
7212 }
7213 #if 0
7214 if ((IS_NILLABLE(sub)) && (!IS_NILLABLE(exp)))
7215 ret = 0;
7216 #endif
7217 return(ret);
7218 }
7219
7220 static xmlExpNodePtr xmlExpExpDeriveInt(xmlExpCtxtPtr ctxt, xmlExpNodePtr exp,
7221 xmlExpNodePtr sub);
7222 /**
7223 * xmlExpDivide:
7224 * @ctxt: the expressions context
7225 * @exp: the englobing expression
7226 * @sub: the subexpression
7227 * @mult: the multiple expression
7228 * @remain: the remain from the derivation of the multiple
7229 *
7230 * Check if exp is a multiple of sub, i.e. if there is a finite number n
7231 * so that sub{n} subsume exp
7232 *
7233 * Returns the multiple value if successful, 0 if it is not a multiple
7234 * and -1 in case of internel error.
7235 */
7236
7237 static int
7238 xmlExpDivide(xmlExpCtxtPtr ctxt, xmlExpNodePtr exp, xmlExpNodePtr sub,
7239 xmlExpNodePtr *mult, xmlExpNodePtr *remain) {
7240 int i;
7241 xmlExpNodePtr tmp, tmp2;
7242
7243 if (mult != NULL) *mult = NULL;
7244 if (remain != NULL) *remain = NULL;
7245 if (exp->c_max == -1) return(0);
7246 if (IS_NILLABLE(exp) && (!IS_NILLABLE(sub))) return(0);
7247
7248 for (i = 1;i <= exp->c_max;i++) {
7249 sub->ref++;
7250 tmp = xmlExpHashGetEntry(ctxt, XML_EXP_COUNT,
7251 sub, NULL, NULL, i, i);
7252 if (tmp == NULL) {
7253 return(-1);
7254 }
7255 if (!xmlExpCheckCard(tmp, exp)) {
7256 xmlExpFree(ctxt, tmp);
7257 continue;
7258 }
7259 tmp2 = xmlExpExpDeriveInt(ctxt, tmp, exp);
7260 if (tmp2 == NULL) {
7261 xmlExpFree(ctxt, tmp);
7262 return(-1);
7263 }
7264 if ((tmp2 != forbiddenExp) && (IS_NILLABLE(tmp2))) {
7265 if (remain != NULL)
7266 *remain = tmp2;
7267 else
7268 xmlExpFree(ctxt, tmp2);
7269 if (mult != NULL)
7270 *mult = tmp;
7271 else
7272 xmlExpFree(ctxt, tmp);
7273 #ifdef DEBUG_DERIV
7274 printf("Divide succeeded %d\n", i);
7275 #endif
7276 return(i);
7277 }
7278 xmlExpFree(ctxt, tmp);
7279 xmlExpFree(ctxt, tmp2);
7280 }
7281 #ifdef DEBUG_DERIV
7282 printf("Divide failed\n");
7283 #endif
7284 return(0);
7285 }
7286
7287 /**
7288 * xmlExpExpDeriveInt:
7289 * @ctxt: the expressions context
7290 * @exp: the englobing expression
7291 * @sub: the subexpression
7292 *
7293 * Try to do a step of Brzozowski derivation but at a higher level
7294 * the input being a subexpression.
7295 *
7296 * Returns the resulting expression or NULL in case of internal error
7297 */
7298 static xmlExpNodePtr
7299 xmlExpExpDeriveInt(xmlExpCtxtPtr ctxt, xmlExpNodePtr exp, xmlExpNodePtr sub) {
7300 xmlExpNodePtr ret, tmp, tmp2, tmp3;
7301 const xmlChar **tab;
7302 int len, i;
7303
7304 /*
7305 * In case of equality and if the expression can only consume a finite
7306 * amount, then the derivation is empty
7307 */
7308 if ((exp == sub) && (exp->c_max >= 0)) {
7309 #ifdef DEBUG_DERIV
7310 printf("Equal(exp, sub) and finite -> Empty\n");
7311 #endif
7312 return(emptyExp);
7313 }
7314 /*
7315 * decompose sub sequence first
7316 */
7317 if (sub->type == XML_EXP_EMPTY) {
7318 #ifdef DEBUG_DERIV
7319 printf("Empty(sub) -> Empty\n");
7320 #endif
7321 exp->ref++;
7322 return(exp);
7323 }
7324 if (sub->type == XML_EXP_SEQ) {
7325 #ifdef DEBUG_DERIV
7326 printf("Seq(sub) -> decompose\n");
7327 #endif
7328 tmp = xmlExpExpDeriveInt(ctxt, exp, sub->exp_left);
7329 if (tmp == NULL)
7330 return(NULL);
7331 if (tmp == forbiddenExp)
7332 return(tmp);
7333 ret = xmlExpExpDeriveInt(ctxt, tmp, sub->exp_right);
7334 xmlExpFree(ctxt, tmp);
7335 return(ret);
7336 }
7337 if (sub->type == XML_EXP_OR) {
7338 #ifdef DEBUG_DERIV
7339 printf("Or(sub) -> decompose\n");
7340 #endif
7341 tmp = xmlExpExpDeriveInt(ctxt, exp, sub->exp_left);
7342 if (tmp == forbiddenExp)
7343 return(tmp);
7344 if (tmp == NULL)
7345 return(NULL);
7346 ret = xmlExpExpDeriveInt(ctxt, exp, sub->exp_right);
7347 if ((ret == NULL) || (ret == forbiddenExp)) {
7348 xmlExpFree(ctxt, tmp);
7349 return(ret);
7350 }
7351 return(xmlExpHashGetEntry(ctxt, XML_EXP_OR, tmp, ret, NULL, 0, 0));
7352 }
7353 if (!xmlExpCheckCard(exp, sub)) {
7354 #ifdef DEBUG_DERIV
7355 printf("CheckCard(exp, sub) failed -> Forbid\n");
7356 #endif
7357 return(forbiddenExp);
7358 }
7359 switch (exp->type) {
7360 case XML_EXP_EMPTY:
7361 if (sub == emptyExp)
7362 return(emptyExp);
7363 #ifdef DEBUG_DERIV
7364 printf("Empty(exp) -> Forbid\n");
7365 #endif
7366 return(forbiddenExp);
7367 case XML_EXP_FORBID:
7368 #ifdef DEBUG_DERIV
7369 printf("Forbid(exp) -> Forbid\n");
7370 #endif
7371 return(forbiddenExp);
7372 case XML_EXP_ATOM:
7373 if (sub->type == XML_EXP_ATOM) {
7374 /* TODO: handle wildcards */
7375 if (exp->exp_str == sub->exp_str) {
7376 #ifdef DEBUG_DERIV
7377 printf("Atom match -> Empty\n");
7378 #endif
7379 return(emptyExp);
7380 }
7381 #ifdef DEBUG_DERIV
7382 printf("Atom mismatch -> Forbid\n");
7383 #endif
7384 return(forbiddenExp);
7385 }
7386 if ((sub->type == XML_EXP_COUNT) &&
7387 (sub->exp_max == 1) &&
7388 (sub->exp_left->type == XML_EXP_ATOM)) {
7389 /* TODO: handle wildcards */
7390 if (exp->exp_str == sub->exp_left->exp_str) {
7391 #ifdef DEBUG_DERIV
7392 printf("Atom match -> Empty\n");
7393 #endif
7394 return(emptyExp);
7395 }
7396 #ifdef DEBUG_DERIV
7397 printf("Atom mismatch -> Forbid\n");
7398 #endif
7399 return(forbiddenExp);
7400 }
7401 #ifdef DEBUG_DERIV
7402 printf("Compex exp vs Atom -> Forbid\n");
7403 #endif
7404 return(forbiddenExp);
7405 case XML_EXP_SEQ:
7406 /* try to get the sequence consumed only if possible */
7407 if (xmlExpCheckCard(exp->exp_left, sub)) {
7408 /* See if the sequence can be consumed directly */
7409 #ifdef DEBUG_DERIV
7410 printf("Seq trying left only\n");
7411 #endif
7412 ret = xmlExpExpDeriveInt(ctxt, exp->exp_left, sub);
7413 if ((ret != forbiddenExp) && (ret != NULL)) {
7414 #ifdef DEBUG_DERIV
7415 printf("Seq trying left only worked\n");
7416 #endif
7417 /*
7418 * TODO: assumption here that we are determinist
7419 * i.e. we won't get to a nillable exp left
7420 * subset which could be matched by the right
7421 * part too.
7422 * e.g.: (a | b)+,(a | c) and 'a+,a'
7423 */
7424 exp->exp_right->ref++;
7425 return(xmlExpHashGetEntry(ctxt, XML_EXP_SEQ, ret,
7426 exp->exp_right, NULL, 0, 0));
7427 }
7428 #ifdef DEBUG_DERIV
7429 } else {
7430 printf("Seq: left too short\n");
7431 #endif
7432 }
7433 /* Try instead to decompose */
7434 if (sub->type == XML_EXP_COUNT) {
7435 int min, max;
7436
7437 #ifdef DEBUG_DERIV
7438 printf("Seq: sub is a count\n");
7439 #endif
7440 ret = xmlExpExpDeriveInt(ctxt, exp->exp_left, sub->exp_left);
7441 if (ret == NULL)
7442 return(NULL);
7443 if (ret != forbiddenExp) {
7444 #ifdef DEBUG_DERIV
7445 printf("Seq , Count match on left\n");
7446 #endif
7447 if (sub->exp_max < 0)
7448 max = -1;
7449 else
7450 max = sub->exp_max -1;
7451 if (sub->exp_min > 0)
7452 min = sub->exp_min -1;
7453 else
7454 min = 0;
7455 exp->exp_right->ref++;
7456 tmp = xmlExpHashGetEntry(ctxt, XML_EXP_SEQ, ret,
7457 exp->exp_right, NULL, 0, 0);
7458 if (tmp == NULL)
7459 return(NULL);
7460
7461 sub->exp_left->ref++;
7462 tmp2 = xmlExpHashGetEntry(ctxt, XML_EXP_COUNT,
7463 sub->exp_left, NULL, NULL, min, max);
7464 if (tmp2 == NULL) {
7465 xmlExpFree(ctxt, tmp);
7466 return(NULL);
7467 }
7468 ret = xmlExpExpDeriveInt(ctxt, tmp, tmp2);
7469 xmlExpFree(ctxt, tmp);
7470 xmlExpFree(ctxt, tmp2);
7471 return(ret);
7472 }
7473 }
7474 /* we made no progress on structured operations */
7475 break;
7476 case XML_EXP_OR:
7477 #ifdef DEBUG_DERIV
7478 printf("Or , trying both side\n");
7479 #endif
7480 ret = xmlExpExpDeriveInt(ctxt, exp->exp_left, sub);
7481 if (ret == NULL)
7482 return(NULL);
7483 tmp = xmlExpExpDeriveInt(ctxt, exp->exp_right, sub);
7484 if (tmp == NULL) {
7485 xmlExpFree(ctxt, ret);
7486 return(NULL);
7487 }
7488 return(xmlExpHashGetEntry(ctxt, XML_EXP_OR, ret, tmp, NULL, 0, 0));
7489 case XML_EXP_COUNT: {
7490 int min, max;
7491
7492 if (sub->type == XML_EXP_COUNT) {
7493 /*
7494 * Try to see if the loop is completely subsumed
7495 */
7496 tmp = xmlExpExpDeriveInt(ctxt, exp->exp_left, sub->exp_left);
7497 if (tmp == NULL)
7498 return(NULL);
7499 if (tmp == forbiddenExp) {
7500 int mult;
7501
7502 #ifdef DEBUG_DERIV
7503 printf("Count, Count inner don't subsume\n");
7504 #endif
7505 mult = xmlExpDivide(ctxt, sub->exp_left, exp->exp_left,
7506 NULL, &tmp);
7507 if (mult <= 0) {
7508 #ifdef DEBUG_DERIV
7509 printf("Count, Count not multiple => forbidden\n");
7510 #endif
7511 return(forbiddenExp);
7512 }
7513 if (sub->exp_max == -1) {
7514 max = -1;
7515 if (exp->exp_max == -1) {
7516 if (exp->exp_min <= sub->exp_min * mult)
7517 min = 0;
7518 else
7519 min = exp->exp_min - sub->exp_min * mult;
7520 } else {
7521 #ifdef DEBUG_DERIV
7522 printf("Count, Count finite can't subsume infinite\n");
7523 #endif
7524 xmlExpFree(ctxt, tmp);
7525 return(forbiddenExp);
7526 }
7527 } else {
7528 if (exp->exp_max == -1) {
7529 #ifdef DEBUG_DERIV
7530 printf("Infinite loop consume mult finite loop\n");
7531 #endif
7532 if (exp->exp_min > sub->exp_min * mult) {
7533 max = -1;
7534 min = exp->exp_min - sub->exp_min * mult;
7535 } else {
7536 max = -1;
7537 min = 0;
7538 }
7539 } else {
7540 if (exp->exp_max < sub->exp_max * mult) {
7541 #ifdef DEBUG_DERIV
7542 printf("loops max mult mismatch => forbidden\n");
7543 #endif
7544 xmlExpFree(ctxt, tmp);
7545 return(forbiddenExp);
7546 }
7547 if (sub->exp_max * mult > exp->exp_min)
7548 min = 0;
7549 else
7550 min = exp->exp_min - sub->exp_max * mult;
7551 max = exp->exp_max - sub->exp_max * mult;
7552 }
7553 }
7554 } else if (!IS_NILLABLE(tmp)) {
7555 /*
7556 * TODO: loop here to try to grow if working on finite
7557 * blocks.
7558 */
7559 #ifdef DEBUG_DERIV
7560 printf("Count, Count remain not nillable => forbidden\n");
7561 #endif
7562 xmlExpFree(ctxt, tmp);
7563 return(forbiddenExp);
7564 } else if (sub->exp_max == -1) {
7565 if (exp->exp_max == -1) {
7566 if (exp->exp_min <= sub->exp_min) {
7567 #ifdef DEBUG_DERIV
7568 printf("Infinite loops Okay => COUNT(0,Inf)\n");
7569 #endif
7570 max = -1;
7571 min = 0;
7572 } else {
7573 #ifdef DEBUG_DERIV
7574 printf("Infinite loops min => Count(X,Inf)\n");
7575 #endif
7576 max = -1;
7577 min = exp->exp_min - sub->exp_min;
7578 }
7579 } else if (exp->exp_min > sub->exp_min) {
7580 #ifdef DEBUG_DERIV
7581 printf("loops min mismatch 1 => forbidden ???\n");
7582 #endif
7583 xmlExpFree(ctxt, tmp);
7584 return(forbiddenExp);
7585 } else {
7586 max = -1;
7587 min = 0;
7588 }
7589 } else {
7590 if (exp->exp_max == -1) {
7591 #ifdef DEBUG_DERIV
7592 printf("Infinite loop consume finite loop\n");
7593 #endif
7594 if (exp->exp_min > sub->exp_min) {
7595 max = -1;
7596 min = exp->exp_min - sub->exp_min;
7597 } else {
7598 max = -1;
7599 min = 0;
7600 }
7601 } else {
7602 if (exp->exp_max < sub->exp_max) {
7603 #ifdef DEBUG_DERIV
7604 printf("loops max mismatch => forbidden\n");
7605 #endif
7606 xmlExpFree(ctxt, tmp);
7607 return(forbiddenExp);
7608 }
7609 if (sub->exp_max > exp->exp_min)
7610 min = 0;
7611 else
7612 min = exp->exp_min - sub->exp_max;
7613 max = exp->exp_max - sub->exp_max;
7614 }
7615 }
7616 #ifdef DEBUG_DERIV
7617 printf("loops match => SEQ(COUNT())\n");
7618 #endif
7619 exp->exp_left->ref++;
7620 tmp2 = xmlExpHashGetEntry(ctxt, XML_EXP_COUNT, exp->exp_left,
7621 NULL, NULL, min, max);
7622 if (tmp2 == NULL) {
7623 return(NULL);
7624 }
7625 ret = xmlExpHashGetEntry(ctxt, XML_EXP_SEQ, tmp, tmp2,
7626 NULL, 0, 0);
7627 return(ret);
7628 }
7629 tmp = xmlExpExpDeriveInt(ctxt, exp->exp_left, sub);
7630 if (tmp == NULL)
7631 return(NULL);
7632 if (tmp == forbiddenExp) {
7633 #ifdef DEBUG_DERIV
7634 printf("loop mismatch => forbidden\n");
7635 #endif
7636 return(forbiddenExp);
7637 }
7638 if (exp->exp_min > 0)
7639 min = exp->exp_min - 1;
7640 else
7641 min = 0;
7642 if (exp->exp_max < 0)
7643 max = -1;
7644 else
7645 max = exp->exp_max - 1;
7646
7647 #ifdef DEBUG_DERIV
7648 printf("loop match => SEQ(COUNT())\n");
7649 #endif
7650 exp->exp_left->ref++;
7651 tmp2 = xmlExpHashGetEntry(ctxt, XML_EXP_COUNT, exp->exp_left,
7652 NULL, NULL, min, max);
7653 if (tmp2 == NULL)
7654 return(NULL);
7655 ret = xmlExpHashGetEntry(ctxt, XML_EXP_SEQ, tmp, tmp2,
7656 NULL, 0, 0);
7657 return(ret);
7658 }
7659 }
7660
7661 #ifdef DEBUG_DERIV
7662 printf("Fallback to derivative\n");
7663 #endif
7664 if (IS_NILLABLE(sub)) {
7665 if (!(IS_NILLABLE(exp)))
7666 return(forbiddenExp);
7667 else
7668 ret = emptyExp;
7669 } else
7670 ret = NULL;
7671 /*
7672 * here the structured derivation made no progress so
7673 * we use the default token based derivation to force one more step
7674 */
7675 if (ctxt->tabSize == 0)
7676 ctxt->tabSize = 40;
7677
7678 tab = (const xmlChar **) xmlMalloc(ctxt->tabSize *
7679 sizeof(const xmlChar *));
7680 if (tab == NULL) {
7681 return(NULL);
7682 }
7683
7684 /*
7685 * collect all the strings accepted by the subexpression on input
7686 */
7687 len = xmlExpGetStartInt(ctxt, sub, tab, ctxt->tabSize, 0);
7688 while (len < 0) {
7689 const xmlChar **temp;
7690 temp = (const xmlChar **) xmlRealloc((xmlChar **) tab, ctxt->tabSize * 2 *
7691 sizeof(const xmlChar *));
7692 if (temp == NULL) {
7693 xmlFree((xmlChar **) tab);
7694 return(NULL);
7695 }
7696 tab = temp;
7697 ctxt->tabSize *= 2;
7698 len = xmlExpGetStartInt(ctxt, sub, tab, ctxt->tabSize, 0);
7699 }
7700 for (i = 0;i < len;i++) {
7701 tmp = xmlExpStringDeriveInt(ctxt, exp, tab[i]);
7702 if ((tmp == NULL) || (tmp == forbiddenExp)) {
7703 xmlExpFree(ctxt, ret);
7704 xmlFree((xmlChar **) tab);
7705 return(tmp);
7706 }
7707 tmp2 = xmlExpStringDeriveInt(ctxt, sub, tab[i]);
7708 if ((tmp2 == NULL) || (tmp2 == forbiddenExp)) {
7709 xmlExpFree(ctxt, tmp);
7710 xmlExpFree(ctxt, ret);
7711 xmlFree((xmlChar **) tab);
7712 return(tmp);
7713 }
7714 tmp3 = xmlExpExpDeriveInt(ctxt, tmp, tmp2);
7715 xmlExpFree(ctxt, tmp);
7716 xmlExpFree(ctxt, tmp2);
7717
7718 if ((tmp3 == NULL) || (tmp3 == forbiddenExp)) {
7719 xmlExpFree(ctxt, ret);
7720 xmlFree((xmlChar **) tab);
7721 return(tmp3);
7722 }
7723
7724 if (ret == NULL)
7725 ret = tmp3;
7726 else {
7727 ret = xmlExpHashGetEntry(ctxt, XML_EXP_OR, ret, tmp3, NULL, 0, 0);
7728 if (ret == NULL) {
7729 xmlFree((xmlChar **) tab);
7730 return(NULL);
7731 }
7732 }
7733 }
7734 xmlFree((xmlChar **) tab);
7735 return(ret);
7736 }
7737
7738 /**
7739 * xmlExpExpDerive:
7740 * @ctxt: the expressions context
7741 * @exp: the englobing expression
7742 * @sub: the subexpression
7743 *
7744 * Evaluates the expression resulting from @exp consuming a sub expression @sub
7745 * Based on algebraic derivation and sometimes direct Brzozowski derivation
7746 * it usually tatkes less than linear time and can handle expressions generating
7747 * infinite languages.
7748 *
7749 * Returns the resulting expression or NULL in case of internal error, the
7750 * result must be freed
7751 */
7752 xmlExpNodePtr
7753 xmlExpExpDerive(xmlExpCtxtPtr ctxt, xmlExpNodePtr exp, xmlExpNodePtr sub) {
7754 if ((exp == NULL) || (ctxt == NULL) || (sub == NULL))
7755 return(NULL);
7756
7757 /*
7758 * O(1) speedups
7759 */
7760 if (IS_NILLABLE(sub) && (!IS_NILLABLE(exp))) {
7761 #ifdef DEBUG_DERIV
7762 printf("Sub nillable and not exp : can't subsume\n");
7763 #endif
7764 return(forbiddenExp);
7765 }
7766 if (xmlExpCheckCard(exp, sub) == 0) {
7767 #ifdef DEBUG_DERIV
7768 printf("sub generate longuer sequances than exp : can't subsume\n");
7769 #endif
7770 return(forbiddenExp);
7771 }
7772 return(xmlExpExpDeriveInt(ctxt, exp, sub));
7773 }
7774
7775 /**
7776 * xmlExpSubsume:
7777 * @ctxt: the expressions context
7778 * @exp: the englobing expression
7779 * @sub: the subexpression
7780 *
7781 * Check whether @exp accepts all the languages accexpted by @sub
7782 * the input being a subexpression.
7783 *
7784 * Returns 1 if true 0 if false and -1 in case of failure.
7785 */
7786 int
7787 xmlExpSubsume(xmlExpCtxtPtr ctxt, xmlExpNodePtr exp, xmlExpNodePtr sub) {
7788 xmlExpNodePtr tmp;
7789
7790 if ((exp == NULL) || (ctxt == NULL) || (sub == NULL))
7791 return(-1);
7792
7793 /*
7794 * TODO: speedup by checking the language of sub is a subset of the
7795 * language of exp
7796 */
7797 /*
7798 * O(1) speedups
7799 */
7800 if (IS_NILLABLE(sub) && (!IS_NILLABLE(exp))) {
7801 #ifdef DEBUG_DERIV
7802 printf("Sub nillable and not exp : can't subsume\n");
7803 #endif
7804 return(0);
7805 }
7806 if (xmlExpCheckCard(exp, sub) == 0) {
7807 #ifdef DEBUG_DERIV
7808 printf("sub generate longuer sequances than exp : can't subsume\n");
7809 #endif
7810 return(0);
7811 }
7812 tmp = xmlExpExpDeriveInt(ctxt, exp, sub);
7813 #ifdef DEBUG_DERIV
7814 printf("Result derivation :\n");
7815 PRINT_EXP(tmp);
7816 #endif
7817 if (tmp == NULL)
7818 return(-1);
7819 if (tmp == forbiddenExp)
7820 return(0);
7821 if (tmp == emptyExp)
7822 return(1);
7823 if ((tmp != NULL) && (IS_NILLABLE(tmp))) {
7824 xmlExpFree(ctxt, tmp);
7825 return(1);
7826 }
7827 xmlExpFree(ctxt, tmp);
7828 return(0);
7829 }
7830
7831 /************************************************************************
7832 * *
7833 * Parsing expression *
7834 * *
7835 ************************************************************************/
7836
7837 static xmlExpNodePtr xmlExpParseExpr(xmlExpCtxtPtr ctxt);
7838
7839 #undef CUR
7840 #define CUR (*ctxt->cur)
7841 #undef NEXT
7842 #define NEXT ctxt->cur++;
7843 #undef IS_BLANK
7844 #define IS_BLANK(c) ((c == ' ') || (c == '\n') || (c == '\r') || (c == '\t'))
7845 #define SKIP_BLANKS while (IS_BLANK(*ctxt->cur)) ctxt->cur++;
7846
7847 static int
7848 xmlExpParseNumber(xmlExpCtxtPtr ctxt) {
7849 int ret = 0;
7850
7851 SKIP_BLANKS
7852 if (CUR == '*') {
7853 NEXT
7854 return(-1);
7855 }
7856 if ((CUR < '0') || (CUR > '9'))
7857 return(-1);
7858 while ((CUR >= '0') && (CUR <= '9')) {
7859 ret = ret * 10 + (CUR - '0');
7860 NEXT
7861 }
7862 return(ret);
7863 }
7864
7865 static xmlExpNodePtr
7866 xmlExpParseOr(xmlExpCtxtPtr ctxt) {
7867 const char *base;
7868 xmlExpNodePtr ret;
7869 const xmlChar *val;
7870
7871 SKIP_BLANKS
7872 base = ctxt->cur;
7873 if (*ctxt->cur == '(') {
7874 NEXT
7875 ret = xmlExpParseExpr(ctxt);
7876 SKIP_BLANKS
7877 if (*ctxt->cur != ')') {
7878 fprintf(stderr, "unbalanced '(' : %s\n", base);
7879 xmlExpFree(ctxt, ret);
7880 return(NULL);
7881 }
7882 NEXT;
7883 SKIP_BLANKS
7884 goto parse_quantifier;
7885 }
7886 while ((CUR != 0) && (!(IS_BLANK(CUR))) && (CUR != '(') &&
7887 (CUR != ')') && (CUR != '|') && (CUR != ',') && (CUR != '{') &&
7888 (CUR != '*') && (CUR != '+') && (CUR != '?') && (CUR != '}'))
7889 NEXT;
7890 val = xmlDictLookup(ctxt->dict, BAD_CAST base, ctxt->cur - base);
7891 if (val == NULL)
7892 return(NULL);
7893 ret = xmlExpHashGetEntry(ctxt, XML_EXP_ATOM, NULL, NULL, val, 0, 0);
7894 if (ret == NULL)
7895 return(NULL);
7896 SKIP_BLANKS
7897 parse_quantifier:
7898 if (CUR == '{') {
7899 int min, max;
7900
7901 NEXT
7902 min = xmlExpParseNumber(ctxt);
7903 if (min < 0) {
7904 xmlExpFree(ctxt, ret);
7905 return(NULL);
7906 }
7907 SKIP_BLANKS
7908 if (CUR == ',') {
7909 NEXT
7910 max = xmlExpParseNumber(ctxt);
7911 SKIP_BLANKS
7912 } else
7913 max = min;
7914 if (CUR != '}') {
7915 xmlExpFree(ctxt, ret);
7916 return(NULL);
7917 }
7918 NEXT
7919 ret = xmlExpHashGetEntry(ctxt, XML_EXP_COUNT, ret, NULL, NULL,
7920 min, max);
7921 SKIP_BLANKS
7922 } else if (CUR == '?') {
7923 NEXT
7924 ret = xmlExpHashGetEntry(ctxt, XML_EXP_COUNT, ret, NULL, NULL,
7925 0, 1);
7926 SKIP_BLANKS
7927 } else if (CUR == '+') {
7928 NEXT
7929 ret = xmlExpHashGetEntry(ctxt, XML_EXP_COUNT, ret, NULL, NULL,
7930 1, -1);
7931 SKIP_BLANKS
7932 } else if (CUR == '*') {
7933 NEXT
7934 ret = xmlExpHashGetEntry(ctxt, XML_EXP_COUNT, ret, NULL, NULL,
7935 0, -1);
7936 SKIP_BLANKS
7937 }
7938 return(ret);
7939 }
7940
7941
7942 static xmlExpNodePtr
7943 xmlExpParseSeq(xmlExpCtxtPtr ctxt) {
7944 xmlExpNodePtr ret, right;
7945
7946 ret = xmlExpParseOr(ctxt);
7947 SKIP_BLANKS
7948 while (CUR == '|') {
7949 NEXT
7950 right = xmlExpParseOr(ctxt);
7951 if (right == NULL) {
7952 xmlExpFree(ctxt, ret);
7953 return(NULL);
7954 }
7955 ret = xmlExpHashGetEntry(ctxt, XML_EXP_OR, ret, right, NULL, 0, 0);
7956 if (ret == NULL)
7957 return(NULL);
7958 }
7959 return(ret);
7960 }
7961
7962 static xmlExpNodePtr
7963 xmlExpParseExpr(xmlExpCtxtPtr ctxt) {
7964 xmlExpNodePtr ret, right;
7965
7966 ret = xmlExpParseSeq(ctxt);
7967 SKIP_BLANKS
7968 while (CUR == ',') {
7969 NEXT
7970 right = xmlExpParseSeq(ctxt);
7971 if (right == NULL) {
7972 xmlExpFree(ctxt, ret);
7973 return(NULL);
7974 }
7975 ret = xmlExpHashGetEntry(ctxt, XML_EXP_SEQ, ret, right, NULL, 0, 0);
7976 if (ret == NULL)
7977 return(NULL);
7978 }
7979 return(ret);
7980 }
7981
7982 /**
7983 * xmlExpParse:
7984 * @ctxt: the expressions context
7985 * @expr: the 0 terminated string
7986 *
7987 * Minimal parser for regexps, it understand the following constructs
7988 * - string terminals
7989 * - choice operator |
7990 * - sequence operator ,
7991 * - subexpressions (...)
7992 * - usual cardinality operators + * and ?
7993 * - finite sequences { min, max }
7994 * - infinite sequences { min, * }
7995 * There is minimal checkings made especially no checking on strings values
7996 *
7997 * Returns a new expression or NULL in case of failure
7998 */
7999 xmlExpNodePtr
8000 xmlExpParse(xmlExpCtxtPtr ctxt, const char *expr) {
8001 xmlExpNodePtr ret;
8002
8003 ctxt->expr = expr;
8004 ctxt->cur = expr;
8005
8006 ret = xmlExpParseExpr(ctxt);
8007 SKIP_BLANKS
8008 if (*ctxt->cur != 0) {
8009 xmlExpFree(ctxt, ret);
8010 return(NULL);
8011 }
8012 return(ret);
8013 }
8014
8015 static void
8016 xmlExpDumpInt(xmlBufferPtr buf, xmlExpNodePtr expr, int glob) {
8017 xmlExpNodePtr c;
8018
8019 if (expr == NULL) return;
8020 if (glob) xmlBufferWriteChar(buf, "(");
8021 switch (expr->type) {
8022 case XML_EXP_EMPTY:
8023 xmlBufferWriteChar(buf, "empty");
8024 break;
8025 case XML_EXP_FORBID:
8026 xmlBufferWriteChar(buf, "forbidden");
8027 break;
8028 case XML_EXP_ATOM:
8029 xmlBufferWriteCHAR(buf, expr->exp_str);
8030 break;
8031 case XML_EXP_SEQ:
8032 c = expr->exp_left;
8033 if ((c->type == XML_EXP_SEQ) || (c->type == XML_EXP_OR))
8034 xmlExpDumpInt(buf, c, 1);
8035 else
8036 xmlExpDumpInt(buf, c, 0);
8037 xmlBufferWriteChar(buf, " , ");
8038 c = expr->exp_right;
8039 if ((c->type == XML_EXP_SEQ) || (c->type == XML_EXP_OR))
8040 xmlExpDumpInt(buf, c, 1);
8041 else
8042 xmlExpDumpInt(buf, c, 0);
8043 break;
8044 case XML_EXP_OR:
8045 c = expr->exp_left;
8046 if ((c->type == XML_EXP_SEQ) || (c->type == XML_EXP_OR))
8047 xmlExpDumpInt(buf, c, 1);
8048 else
8049 xmlExpDumpInt(buf, c, 0);
8050 xmlBufferWriteChar(buf, " | ");
8051 c = expr->exp_right;
8052 if ((c->type == XML_EXP_SEQ) || (c->type == XML_EXP_OR))
8053 xmlExpDumpInt(buf, c, 1);
8054 else
8055 xmlExpDumpInt(buf, c, 0);
8056 break;
8057 case XML_EXP_COUNT: {
8058 char rep[40];
8059
8060 c = expr->exp_left;
8061 if ((c->type == XML_EXP_SEQ) || (c->type == XML_EXP_OR))
8062 xmlExpDumpInt(buf, c, 1);
8063 else
8064 xmlExpDumpInt(buf, c, 0);
8065 if ((expr->exp_min == 0) && (expr->exp_max == 1)) {
8066 rep[0] = '?';
8067 rep[1] = 0;
8068 } else if ((expr->exp_min == 0) && (expr->exp_max == -1)) {
8069 rep[0] = '*';
8070 rep[1] = 0;
8071 } else if ((expr->exp_min == 1) && (expr->exp_max == -1)) {
8072 rep[0] = '+';
8073 rep[1] = 0;
8074 } else if (expr->exp_max == expr->exp_min) {
8075 snprintf(rep, 39, "{%d}", expr->exp_min);
8076 } else if (expr->exp_max < 0) {
8077 snprintf(rep, 39, "{%d,inf}", expr->exp_min);
8078 } else {
8079 snprintf(rep, 39, "{%d,%d}", expr->exp_min, expr->exp_max);
8080 }
8081 rep[39] = 0;
8082 xmlBufferWriteChar(buf, rep);
8083 break;
8084 }
8085 default:
8086 fprintf(stderr, "Error in tree\n");
8087 }
8088 if (glob)
8089 xmlBufferWriteChar(buf, ")");
8090 }
8091 /**
8092 * xmlExpDump:
8093 * @buf: a buffer to receive the output
8094 * @expr: the compiled expression
8095 *
8096 * Serialize the expression as compiled to the buffer
8097 */
8098 void
8099 xmlExpDump(xmlBufferPtr buf, xmlExpNodePtr expr) {
8100 if ((buf == NULL) || (expr == NULL))
8101 return;
8102 xmlExpDumpInt(buf, expr, 0);
8103 }
8104
8105 /**
8106 * xmlExpMaxToken:
8107 * @expr: a compiled expression
8108 *
8109 * Indicate the maximum number of input a expression can accept
8110 *
8111 * Returns the maximum length or -1 in case of error
8112 */
8113 int
8114 xmlExpMaxToken(xmlExpNodePtr expr) {
8115 if (expr == NULL)
8116 return(-1);
8117 return(expr->c_max);
8118 }
8119
8120 /**
8121 * xmlExpCtxtNbNodes:
8122 * @ctxt: an expression context
8123 *
8124 * Debugging facility provides the number of allocated nodes at a that point
8125 *
8126 * Returns the number of nodes in use or -1 in case of error
8127 */
8128 int
8129 xmlExpCtxtNbNodes(xmlExpCtxtPtr ctxt) {
8130 if (ctxt == NULL)
8131 return(-1);
8132 return(ctxt->nb_nodes);
8133 }
8134
8135 /**
8136 * xmlExpCtxtNbCons:
8137 * @ctxt: an expression context
8138 *
8139 * Debugging facility provides the number of allocated nodes over lifetime
8140 *
8141 * Returns the number of nodes ever allocated or -1 in case of error
8142 */
8143 int
8144 xmlExpCtxtNbCons(xmlExpCtxtPtr ctxt) {
8145 if (ctxt == NULL)
8146 return(-1);
8147 return(ctxt->nb_cons);
8148 }
8149
8150 #endif /* LIBXML_EXPR_ENABLED */
8151 #define bottom_xmlregexp
8152 #include "elfgcchack.h"
8153 #endif /* LIBXML_REGEXP_ENABLED */