1 | /* |
2 | * xpointer.c : Code to handle XML Pointer |
3 | * |
4 | * Base implementation was made accordingly to |
5 | * W3C Candidate Recommendation 7 June 2000 |
6 | * http://www.w3.org/TR/2000/CR-xptr-20000607 |
7 | * |
8 | * Added support for the element() scheme described in: |
9 | * W3C Proposed Recommendation 13 November 2002 |
10 | * http://www.w3.org/TR/2002/PR-xptr-element-20021113/ |
11 | * |
12 | * See Copyright for the status of this software. |
13 | * |
14 | * daniel@veillard.com |
15 | */ |
16 | |
17 | /* To avoid EBCDIC trouble when parsing on zOS */ |
18 | #if defined(__MVS__) |
19 | #pragma convert("ISO8859-1") |
20 | #endif |
21 | |
22 | #define IN_LIBXML |
23 | #include "libxml.h" |
24 | |
25 | /* |
26 | * TODO: better handling of error cases, the full expression should |
27 | * be parsed beforehand instead of a progressive evaluation |
28 | * TODO: Access into entities references are not supported now ... |
29 | * need a start to be able to pop out of entities refs since |
30 | * parent is the endity declaration, not the ref. |
31 | */ |
32 | |
33 | #include <string.h> |
34 | #include <libxml/xpointer.h> |
35 | #include <libxml/xmlmemory.h> |
36 | #include <libxml/parserInternals.h> |
37 | #include <libxml/uri.h> |
38 | #include <libxml/xpath.h> |
39 | #include <libxml/xpathInternals.h> |
40 | #include <libxml/xmlerror.h> |
41 | #include <libxml/globals.h> |
42 | |
43 | #ifdef LIBXML_XPTR_ENABLED |
44 | |
45 | /* Add support of the xmlns() xpointer scheme to initialize the namespaces */ |
46 | #define XPTR_XMLNS_SCHEME |
47 | |
48 | /* #define DEBUG_RANGES */ |
49 | #ifdef DEBUG_RANGES |
50 | #ifdef LIBXML_DEBUG_ENABLED |
51 | #include <libxml/debugXML.h> |
52 | #endif |
53 | #endif |
54 | |
55 | #define TODO \ |
56 | xmlGenericError(xmlGenericErrorContext, \ |
57 | "Unimplemented block at %s:%d\n", \ |
58 | __FILE__, __LINE__); |
59 | |
60 | #define STRANGE \ |
61 | xmlGenericError(xmlGenericErrorContext, \ |
62 | "Internal error at %s:%d\n", \ |
63 | __FILE__, __LINE__); |
64 | |
65 | /************************************************************************ |
66 | * * |
67 | * Some factorized error routines * |
68 | * * |
69 | ************************************************************************/ |
70 | |
71 | /** |
72 | * xmlXPtrErrMemory: |
73 | * @extra: extra informations |
74 | * |
75 | * Handle a redefinition of attribute error |
76 | */ |
77 | static void |
78 | xmlXPtrErrMemory(const char *) |
79 | { |
80 | __xmlRaiseError(NULL, NULL, NULL, NULL, NULL, XML_FROM_XPOINTER, |
81 | XML_ERR_NO_MEMORY, XML_ERR_ERROR, NULL, 0, extra, |
82 | NULL, NULL, 0, 0, |
83 | "Memory allocation failed : %s\n" , extra); |
84 | } |
85 | |
86 | /** |
87 | * xmlXPtrErr: |
88 | * @ctxt: an XPTR evaluation context |
89 | * @extra: extra informations |
90 | * |
91 | * Handle a redefinition of attribute error |
92 | */ |
93 | static void LIBXML_ATTR_FORMAT(3,0) |
94 | xmlXPtrErr(xmlXPathParserContextPtr ctxt, int error, |
95 | const char * msg, const xmlChar *) |
96 | { |
97 | if (ctxt != NULL) |
98 | ctxt->error = error; |
99 | if ((ctxt == NULL) || (ctxt->context == NULL)) { |
100 | __xmlRaiseError(NULL, NULL, NULL, |
101 | NULL, NULL, XML_FROM_XPOINTER, error, |
102 | XML_ERR_ERROR, NULL, 0, |
103 | (const char *) extra, NULL, NULL, 0, 0, |
104 | msg, extra); |
105 | return; |
106 | } |
107 | |
108 | /* cleanup current last error */ |
109 | xmlResetError(&ctxt->context->lastError); |
110 | |
111 | ctxt->context->lastError.domain = XML_FROM_XPOINTER; |
112 | ctxt->context->lastError.code = error; |
113 | ctxt->context->lastError.level = XML_ERR_ERROR; |
114 | ctxt->context->lastError.str1 = (char *) xmlStrdup(ctxt->base); |
115 | ctxt->context->lastError.int1 = ctxt->cur - ctxt->base; |
116 | ctxt->context->lastError.node = ctxt->context->debugNode; |
117 | if (ctxt->context->error != NULL) { |
118 | ctxt->context->error(ctxt->context->userData, |
119 | &ctxt->context->lastError); |
120 | } else { |
121 | __xmlRaiseError(NULL, NULL, NULL, |
122 | NULL, ctxt->context->debugNode, XML_FROM_XPOINTER, |
123 | error, XML_ERR_ERROR, NULL, 0, |
124 | (const char *) extra, (const char *) ctxt->base, NULL, |
125 | ctxt->cur - ctxt->base, 0, |
126 | msg, extra); |
127 | } |
128 | } |
129 | |
130 | /************************************************************************ |
131 | * * |
132 | * A few helper functions for child sequences * |
133 | * * |
134 | ************************************************************************/ |
135 | /* xmlXPtrAdvanceNode is a private function, but used by xinclude.c */ |
136 | xmlNodePtr xmlXPtrAdvanceNode(xmlNodePtr cur, int *level); |
137 | /** |
138 | * xmlXPtrGetArity: |
139 | * @cur: the node |
140 | * |
141 | * Returns the number of child for an element, -1 in case of error |
142 | */ |
143 | static int |
144 | xmlXPtrGetArity(xmlNodePtr cur) { |
145 | int i; |
146 | if ((cur == NULL) || (cur->type == XML_NAMESPACE_DECL)) |
147 | return(-1); |
148 | cur = cur->children; |
149 | for (i = 0;cur != NULL;cur = cur->next) { |
150 | if ((cur->type == XML_ELEMENT_NODE) || |
151 | (cur->type == XML_DOCUMENT_NODE) || |
152 | (cur->type == XML_HTML_DOCUMENT_NODE)) { |
153 | i++; |
154 | } |
155 | } |
156 | return(i); |
157 | } |
158 | |
159 | /** |
160 | * xmlXPtrGetIndex: |
161 | * @cur: the node |
162 | * |
163 | * Returns the index of the node in its parent children list, -1 |
164 | * in case of error |
165 | */ |
166 | static int |
167 | xmlXPtrGetIndex(xmlNodePtr cur) { |
168 | int i; |
169 | if ((cur == NULL) || (cur->type == XML_NAMESPACE_DECL)) |
170 | return(-1); |
171 | for (i = 1;cur != NULL;cur = cur->prev) { |
172 | if ((cur->type == XML_ELEMENT_NODE) || |
173 | (cur->type == XML_DOCUMENT_NODE) || |
174 | (cur->type == XML_HTML_DOCUMENT_NODE)) { |
175 | i++; |
176 | } |
177 | } |
178 | return(i); |
179 | } |
180 | |
181 | /** |
182 | * xmlXPtrGetNthChild: |
183 | * @cur: the node |
184 | * @no: the child number |
185 | * |
186 | * Returns the @no'th element child of @cur or NULL |
187 | */ |
188 | static xmlNodePtr |
189 | xmlXPtrGetNthChild(xmlNodePtr cur, int no) { |
190 | int i; |
191 | if ((cur == NULL) || (cur->type == XML_NAMESPACE_DECL)) |
192 | return(cur); |
193 | cur = cur->children; |
194 | for (i = 0;i <= no;cur = cur->next) { |
195 | if (cur == NULL) |
196 | return(cur); |
197 | if ((cur->type == XML_ELEMENT_NODE) || |
198 | (cur->type == XML_DOCUMENT_NODE) || |
199 | (cur->type == XML_HTML_DOCUMENT_NODE)) { |
200 | i++; |
201 | if (i == no) |
202 | break; |
203 | } |
204 | } |
205 | return(cur); |
206 | } |
207 | |
208 | /************************************************************************ |
209 | * * |
210 | * Handling of XPointer specific types * |
211 | * * |
212 | ************************************************************************/ |
213 | |
214 | /** |
215 | * xmlXPtrCmpPoints: |
216 | * @node1: the first node |
217 | * @index1: the first index |
218 | * @node2: the second node |
219 | * @index2: the second index |
220 | * |
221 | * Compare two points w.r.t document order |
222 | * |
223 | * Returns -2 in case of error 1 if first point < second point, 0 if |
224 | * that's the same point, -1 otherwise |
225 | */ |
226 | static int |
227 | xmlXPtrCmpPoints(xmlNodePtr node1, int index1, xmlNodePtr node2, int index2) { |
228 | if ((node1 == NULL) || (node2 == NULL)) |
229 | return(-2); |
230 | /* |
231 | * a couple of optimizations which will avoid computations in most cases |
232 | */ |
233 | if (node1 == node2) { |
234 | if (index1 < index2) |
235 | return(1); |
236 | if (index1 > index2) |
237 | return(-1); |
238 | return(0); |
239 | } |
240 | return(xmlXPathCmpNodes(node1, node2)); |
241 | } |
242 | |
243 | /** |
244 | * xmlXPtrNewPoint: |
245 | * @node: the xmlNodePtr |
246 | * @indx: the indx within the node |
247 | * |
248 | * Create a new xmlXPathObjectPtr of type point |
249 | * |
250 | * Returns the newly created object. |
251 | */ |
252 | static xmlXPathObjectPtr |
253 | xmlXPtrNewPoint(xmlNodePtr node, int indx) { |
254 | xmlXPathObjectPtr ret; |
255 | |
256 | if (node == NULL) |
257 | return(NULL); |
258 | if (indx < 0) |
259 | return(NULL); |
260 | |
261 | ret = (xmlXPathObjectPtr) xmlMalloc(sizeof(xmlXPathObject)); |
262 | if (ret == NULL) { |
263 | xmlXPtrErrMemory("allocating point" ); |
264 | return(NULL); |
265 | } |
266 | memset(ret, 0 , (size_t) sizeof(xmlXPathObject)); |
267 | ret->type = XPATH_POINT; |
268 | ret->user = (void *) node; |
269 | ret->index = indx; |
270 | return(ret); |
271 | } |
272 | |
273 | /** |
274 | * xmlXPtrRangeCheckOrder: |
275 | * @range: an object range |
276 | * |
277 | * Make sure the points in the range are in the right order |
278 | */ |
279 | static void |
280 | xmlXPtrRangeCheckOrder(xmlXPathObjectPtr range) { |
281 | int tmp; |
282 | xmlNodePtr tmp2; |
283 | if (range == NULL) |
284 | return; |
285 | if (range->type != XPATH_RANGE) |
286 | return; |
287 | if (range->user2 == NULL) |
288 | return; |
289 | tmp = xmlXPtrCmpPoints(range->user, range->index, |
290 | range->user2, range->index2); |
291 | if (tmp == -1) { |
292 | tmp2 = range->user; |
293 | range->user = range->user2; |
294 | range->user2 = tmp2; |
295 | tmp = range->index; |
296 | range->index = range->index2; |
297 | range->index2 = tmp; |
298 | } |
299 | } |
300 | |
301 | /** |
302 | * xmlXPtrRangesEqual: |
303 | * @range1: the first range |
304 | * @range2: the second range |
305 | * |
306 | * Compare two ranges |
307 | * |
308 | * Returns 1 if equal, 0 otherwise |
309 | */ |
310 | static int |
311 | xmlXPtrRangesEqual(xmlXPathObjectPtr range1, xmlXPathObjectPtr range2) { |
312 | if (range1 == range2) |
313 | return(1); |
314 | if ((range1 == NULL) || (range2 == NULL)) |
315 | return(0); |
316 | if (range1->type != range2->type) |
317 | return(0); |
318 | if (range1->type != XPATH_RANGE) |
319 | return(0); |
320 | if (range1->user != range2->user) |
321 | return(0); |
322 | if (range1->index != range2->index) |
323 | return(0); |
324 | if (range1->user2 != range2->user2) |
325 | return(0); |
326 | if (range1->index2 != range2->index2) |
327 | return(0); |
328 | return(1); |
329 | } |
330 | |
331 | /** |
332 | * xmlXPtrNewRangeInternal: |
333 | * @start: the starting node |
334 | * @startindex: the start index |
335 | * @end: the ending point |
336 | * @endindex: the ending index |
337 | * |
338 | * Internal function to create a new xmlXPathObjectPtr of type range |
339 | * |
340 | * Returns the newly created object. |
341 | */ |
342 | static xmlXPathObjectPtr |
343 | xmlXPtrNewRangeInternal(xmlNodePtr start, int startindex, |
344 | xmlNodePtr end, int endindex) { |
345 | xmlXPathObjectPtr ret; |
346 | |
347 | /* |
348 | * Namespace nodes must be copied (see xmlXPathNodeSetDupNs). |
349 | * Disallow them for now. |
350 | */ |
351 | if ((start != NULL) && (start->type == XML_NAMESPACE_DECL)) |
352 | return(NULL); |
353 | if ((end != NULL) && (end->type == XML_NAMESPACE_DECL)) |
354 | return(NULL); |
355 | |
356 | ret = (xmlXPathObjectPtr) xmlMalloc(sizeof(xmlXPathObject)); |
357 | if (ret == NULL) { |
358 | xmlXPtrErrMemory("allocating range" ); |
359 | return(NULL); |
360 | } |
361 | memset(ret, 0, sizeof(xmlXPathObject)); |
362 | ret->type = XPATH_RANGE; |
363 | ret->user = start; |
364 | ret->index = startindex; |
365 | ret->user2 = end; |
366 | ret->index2 = endindex; |
367 | return(ret); |
368 | } |
369 | |
370 | /** |
371 | * xmlXPtrNewRange: |
372 | * @start: the starting node |
373 | * @startindex: the start index |
374 | * @end: the ending point |
375 | * @endindex: the ending index |
376 | * |
377 | * Create a new xmlXPathObjectPtr of type range |
378 | * |
379 | * Returns the newly created object. |
380 | */ |
381 | xmlXPathObjectPtr |
382 | xmlXPtrNewRange(xmlNodePtr start, int startindex, |
383 | xmlNodePtr end, int endindex) { |
384 | xmlXPathObjectPtr ret; |
385 | |
386 | if (start == NULL) |
387 | return(NULL); |
388 | if (end == NULL) |
389 | return(NULL); |
390 | if (startindex < 0) |
391 | return(NULL); |
392 | if (endindex < 0) |
393 | return(NULL); |
394 | |
395 | ret = xmlXPtrNewRangeInternal(start, startindex, end, endindex); |
396 | xmlXPtrRangeCheckOrder(ret); |
397 | return(ret); |
398 | } |
399 | |
400 | /** |
401 | * xmlXPtrNewRangePoints: |
402 | * @start: the starting point |
403 | * @end: the ending point |
404 | * |
405 | * Create a new xmlXPathObjectPtr of type range using 2 Points |
406 | * |
407 | * Returns the newly created object. |
408 | */ |
409 | xmlXPathObjectPtr |
410 | xmlXPtrNewRangePoints(xmlXPathObjectPtr start, xmlXPathObjectPtr end) { |
411 | xmlXPathObjectPtr ret; |
412 | |
413 | if (start == NULL) |
414 | return(NULL); |
415 | if (end == NULL) |
416 | return(NULL); |
417 | if (start->type != XPATH_POINT) |
418 | return(NULL); |
419 | if (end->type != XPATH_POINT) |
420 | return(NULL); |
421 | |
422 | ret = xmlXPtrNewRangeInternal(start->user, start->index, end->user, |
423 | end->index); |
424 | xmlXPtrRangeCheckOrder(ret); |
425 | return(ret); |
426 | } |
427 | |
428 | /** |
429 | * xmlXPtrNewRangePointNode: |
430 | * @start: the starting point |
431 | * @end: the ending node |
432 | * |
433 | * Create a new xmlXPathObjectPtr of type range from a point to a node |
434 | * |
435 | * Returns the newly created object. |
436 | */ |
437 | xmlXPathObjectPtr |
438 | xmlXPtrNewRangePointNode(xmlXPathObjectPtr start, xmlNodePtr end) { |
439 | xmlXPathObjectPtr ret; |
440 | |
441 | if (start == NULL) |
442 | return(NULL); |
443 | if (end == NULL) |
444 | return(NULL); |
445 | if (start->type != XPATH_POINT) |
446 | return(NULL); |
447 | |
448 | ret = xmlXPtrNewRangeInternal(start->user, start->index, end, -1); |
449 | xmlXPtrRangeCheckOrder(ret); |
450 | return(ret); |
451 | } |
452 | |
453 | /** |
454 | * xmlXPtrNewRangeNodePoint: |
455 | * @start: the starting node |
456 | * @end: the ending point |
457 | * |
458 | * Create a new xmlXPathObjectPtr of type range from a node to a point |
459 | * |
460 | * Returns the newly created object. |
461 | */ |
462 | xmlXPathObjectPtr |
463 | xmlXPtrNewRangeNodePoint(xmlNodePtr start, xmlXPathObjectPtr end) { |
464 | xmlXPathObjectPtr ret; |
465 | |
466 | if (start == NULL) |
467 | return(NULL); |
468 | if (end == NULL) |
469 | return(NULL); |
470 | if (end->type != XPATH_POINT) |
471 | return(NULL); |
472 | |
473 | ret = xmlXPtrNewRangeInternal(start, -1, end->user, end->index); |
474 | xmlXPtrRangeCheckOrder(ret); |
475 | return(ret); |
476 | } |
477 | |
478 | /** |
479 | * xmlXPtrNewRangeNodes: |
480 | * @start: the starting node |
481 | * @end: the ending node |
482 | * |
483 | * Create a new xmlXPathObjectPtr of type range using 2 nodes |
484 | * |
485 | * Returns the newly created object. |
486 | */ |
487 | xmlXPathObjectPtr |
488 | xmlXPtrNewRangeNodes(xmlNodePtr start, xmlNodePtr end) { |
489 | xmlXPathObjectPtr ret; |
490 | |
491 | if (start == NULL) |
492 | return(NULL); |
493 | if (end == NULL) |
494 | return(NULL); |
495 | |
496 | ret = xmlXPtrNewRangeInternal(start, -1, end, -1); |
497 | xmlXPtrRangeCheckOrder(ret); |
498 | return(ret); |
499 | } |
500 | |
501 | /** |
502 | * xmlXPtrNewCollapsedRange: |
503 | * @start: the starting and ending node |
504 | * |
505 | * Create a new xmlXPathObjectPtr of type range using a single nodes |
506 | * |
507 | * Returns the newly created object. |
508 | */ |
509 | xmlXPathObjectPtr |
510 | xmlXPtrNewCollapsedRange(xmlNodePtr start) { |
511 | xmlXPathObjectPtr ret; |
512 | |
513 | if (start == NULL) |
514 | return(NULL); |
515 | |
516 | ret = xmlXPtrNewRangeInternal(start, -1, NULL, -1); |
517 | return(ret); |
518 | } |
519 | |
520 | /** |
521 | * xmlXPtrNewRangeNodeObject: |
522 | * @start: the starting node |
523 | * @end: the ending object |
524 | * |
525 | * Create a new xmlXPathObjectPtr of type range from a not to an object |
526 | * |
527 | * Returns the newly created object. |
528 | */ |
529 | xmlXPathObjectPtr |
530 | xmlXPtrNewRangeNodeObject(xmlNodePtr start, xmlXPathObjectPtr end) { |
531 | xmlNodePtr endNode; |
532 | int endIndex; |
533 | xmlXPathObjectPtr ret; |
534 | |
535 | if (start == NULL) |
536 | return(NULL); |
537 | if (end == NULL) |
538 | return(NULL); |
539 | switch (end->type) { |
540 | case XPATH_POINT: |
541 | endNode = end->user; |
542 | endIndex = end->index; |
543 | break; |
544 | case XPATH_RANGE: |
545 | endNode = end->user2; |
546 | endIndex = end->index2; |
547 | break; |
548 | case XPATH_NODESET: |
549 | /* |
550 | * Empty set ... |
551 | */ |
552 | if ((end->nodesetval == NULL) || (end->nodesetval->nodeNr <= 0)) |
553 | return(NULL); |
554 | endNode = end->nodesetval->nodeTab[end->nodesetval->nodeNr - 1]; |
555 | endIndex = -1; |
556 | break; |
557 | default: |
558 | /* TODO */ |
559 | return(NULL); |
560 | } |
561 | |
562 | ret = xmlXPtrNewRangeInternal(start, -1, endNode, endIndex); |
563 | xmlXPtrRangeCheckOrder(ret); |
564 | return(ret); |
565 | } |
566 | |
567 | #define XML_RANGESET_DEFAULT 10 |
568 | |
569 | /** |
570 | * xmlXPtrLocationSetCreate: |
571 | * @val: an initial xmlXPathObjectPtr, or NULL |
572 | * |
573 | * Create a new xmlLocationSetPtr of type double and of value @val |
574 | * |
575 | * Returns the newly created object. |
576 | */ |
577 | xmlLocationSetPtr |
578 | xmlXPtrLocationSetCreate(xmlXPathObjectPtr val) { |
579 | xmlLocationSetPtr ret; |
580 | |
581 | ret = (xmlLocationSetPtr) xmlMalloc(sizeof(xmlLocationSet)); |
582 | if (ret == NULL) { |
583 | xmlXPtrErrMemory("allocating locationset" ); |
584 | return(NULL); |
585 | } |
586 | memset(ret, 0 , (size_t) sizeof(xmlLocationSet)); |
587 | if (val != NULL) { |
588 | ret->locTab = (xmlXPathObjectPtr *) xmlMalloc(XML_RANGESET_DEFAULT * |
589 | sizeof(xmlXPathObjectPtr)); |
590 | if (ret->locTab == NULL) { |
591 | xmlXPtrErrMemory("allocating locationset" ); |
592 | xmlFree(ret); |
593 | return(NULL); |
594 | } |
595 | memset(ret->locTab, 0 , |
596 | XML_RANGESET_DEFAULT * (size_t) sizeof(xmlXPathObjectPtr)); |
597 | ret->locMax = XML_RANGESET_DEFAULT; |
598 | ret->locTab[ret->locNr++] = val; |
599 | } |
600 | return(ret); |
601 | } |
602 | |
603 | /** |
604 | * xmlXPtrLocationSetAdd: |
605 | * @cur: the initial range set |
606 | * @val: a new xmlXPathObjectPtr |
607 | * |
608 | * add a new xmlXPathObjectPtr to an existing LocationSet |
609 | * If the location already exist in the set @val is freed. |
610 | */ |
611 | void |
612 | xmlXPtrLocationSetAdd(xmlLocationSetPtr cur, xmlXPathObjectPtr val) { |
613 | int i; |
614 | |
615 | if ((cur == NULL) || (val == NULL)) return; |
616 | |
617 | /* |
618 | * check against doublons |
619 | */ |
620 | for (i = 0;i < cur->locNr;i++) { |
621 | if (xmlXPtrRangesEqual(cur->locTab[i], val)) { |
622 | xmlXPathFreeObject(val); |
623 | return; |
624 | } |
625 | } |
626 | |
627 | /* |
628 | * grow the locTab if needed |
629 | */ |
630 | if (cur->locMax == 0) { |
631 | cur->locTab = (xmlXPathObjectPtr *) xmlMalloc(XML_RANGESET_DEFAULT * |
632 | sizeof(xmlXPathObjectPtr)); |
633 | if (cur->locTab == NULL) { |
634 | xmlXPtrErrMemory("adding location to set" ); |
635 | return; |
636 | } |
637 | memset(cur->locTab, 0 , |
638 | XML_RANGESET_DEFAULT * (size_t) sizeof(xmlXPathObjectPtr)); |
639 | cur->locMax = XML_RANGESET_DEFAULT; |
640 | } else if (cur->locNr == cur->locMax) { |
641 | xmlXPathObjectPtr *temp; |
642 | |
643 | cur->locMax *= 2; |
644 | temp = (xmlXPathObjectPtr *) xmlRealloc(cur->locTab, cur->locMax * |
645 | sizeof(xmlXPathObjectPtr)); |
646 | if (temp == NULL) { |
647 | xmlXPtrErrMemory("adding location to set" ); |
648 | return; |
649 | } |
650 | cur->locTab = temp; |
651 | } |
652 | cur->locTab[cur->locNr++] = val; |
653 | } |
654 | |
655 | /** |
656 | * xmlXPtrLocationSetMerge: |
657 | * @val1: the first LocationSet |
658 | * @val2: the second LocationSet |
659 | * |
660 | * Merges two rangesets, all ranges from @val2 are added to @val1 |
661 | * |
662 | * Returns val1 once extended or NULL in case of error. |
663 | */ |
664 | xmlLocationSetPtr |
665 | xmlXPtrLocationSetMerge(xmlLocationSetPtr val1, xmlLocationSetPtr val2) { |
666 | int i; |
667 | |
668 | if (val1 == NULL) return(NULL); |
669 | if (val2 == NULL) return(val1); |
670 | |
671 | /* |
672 | * !!!!! this can be optimized a lot, knowing that both |
673 | * val1 and val2 already have unicity of their values. |
674 | */ |
675 | |
676 | for (i = 0;i < val2->locNr;i++) |
677 | xmlXPtrLocationSetAdd(val1, val2->locTab[i]); |
678 | |
679 | return(val1); |
680 | } |
681 | |
682 | /** |
683 | * xmlXPtrLocationSetDel: |
684 | * @cur: the initial range set |
685 | * @val: an xmlXPathObjectPtr |
686 | * |
687 | * Removes an xmlXPathObjectPtr from an existing LocationSet |
688 | */ |
689 | void |
690 | xmlXPtrLocationSetDel(xmlLocationSetPtr cur, xmlXPathObjectPtr val) { |
691 | int i; |
692 | |
693 | if (cur == NULL) return; |
694 | if (val == NULL) return; |
695 | |
696 | /* |
697 | * check against doublons |
698 | */ |
699 | for (i = 0;i < cur->locNr;i++) |
700 | if (cur->locTab[i] == val) break; |
701 | |
702 | if (i >= cur->locNr) { |
703 | #ifdef DEBUG |
704 | xmlGenericError(xmlGenericErrorContext, |
705 | "xmlXPtrLocationSetDel: Range wasn't found in RangeList\n" ); |
706 | #endif |
707 | return; |
708 | } |
709 | cur->locNr--; |
710 | for (;i < cur->locNr;i++) |
711 | cur->locTab[i] = cur->locTab[i + 1]; |
712 | cur->locTab[cur->locNr] = NULL; |
713 | } |
714 | |
715 | /** |
716 | * xmlXPtrLocationSetRemove: |
717 | * @cur: the initial range set |
718 | * @val: the index to remove |
719 | * |
720 | * Removes an entry from an existing LocationSet list. |
721 | */ |
722 | void |
723 | xmlXPtrLocationSetRemove(xmlLocationSetPtr cur, int val) { |
724 | if (cur == NULL) return; |
725 | if (val >= cur->locNr) return; |
726 | cur->locNr--; |
727 | for (;val < cur->locNr;val++) |
728 | cur->locTab[val] = cur->locTab[val + 1]; |
729 | cur->locTab[cur->locNr] = NULL; |
730 | } |
731 | |
732 | /** |
733 | * xmlXPtrFreeLocationSet: |
734 | * @obj: the xmlLocationSetPtr to free |
735 | * |
736 | * Free the LocationSet compound (not the actual ranges !). |
737 | */ |
738 | void |
739 | xmlXPtrFreeLocationSet(xmlLocationSetPtr obj) { |
740 | int i; |
741 | |
742 | if (obj == NULL) return; |
743 | if (obj->locTab != NULL) { |
744 | for (i = 0;i < obj->locNr; i++) { |
745 | xmlXPathFreeObject(obj->locTab[i]); |
746 | } |
747 | xmlFree(obj->locTab); |
748 | } |
749 | xmlFree(obj); |
750 | } |
751 | |
752 | /** |
753 | * xmlXPtrNewLocationSetNodes: |
754 | * @start: the start NodePtr value |
755 | * @end: the end NodePtr value or NULL |
756 | * |
757 | * Create a new xmlXPathObjectPtr of type LocationSet and initialize |
758 | * it with the single range made of the two nodes @start and @end |
759 | * |
760 | * Returns the newly created object. |
761 | */ |
762 | xmlXPathObjectPtr |
763 | xmlXPtrNewLocationSetNodes(xmlNodePtr start, xmlNodePtr end) { |
764 | xmlXPathObjectPtr ret; |
765 | |
766 | ret = (xmlXPathObjectPtr) xmlMalloc(sizeof(xmlXPathObject)); |
767 | if (ret == NULL) { |
768 | xmlXPtrErrMemory("allocating locationset" ); |
769 | return(NULL); |
770 | } |
771 | memset(ret, 0 , (size_t) sizeof(xmlXPathObject)); |
772 | ret->type = XPATH_LOCATIONSET; |
773 | if (end == NULL) |
774 | ret->user = xmlXPtrLocationSetCreate(xmlXPtrNewCollapsedRange(start)); |
775 | else |
776 | ret->user = xmlXPtrLocationSetCreate(xmlXPtrNewRangeNodes(start,end)); |
777 | return(ret); |
778 | } |
779 | |
780 | /** |
781 | * xmlXPtrNewLocationSetNodeSet: |
782 | * @set: a node set |
783 | * |
784 | * Create a new xmlXPathObjectPtr of type LocationSet and initialize |
785 | * it with all the nodes from @set |
786 | * |
787 | * Returns the newly created object. |
788 | */ |
789 | xmlXPathObjectPtr |
790 | xmlXPtrNewLocationSetNodeSet(xmlNodeSetPtr set) { |
791 | xmlXPathObjectPtr ret; |
792 | |
793 | ret = (xmlXPathObjectPtr) xmlMalloc(sizeof(xmlXPathObject)); |
794 | if (ret == NULL) { |
795 | xmlXPtrErrMemory("allocating locationset" ); |
796 | return(NULL); |
797 | } |
798 | memset(ret, 0 , (size_t) sizeof(xmlXPathObject)); |
799 | ret->type = XPATH_LOCATIONSET; |
800 | if (set != NULL) { |
801 | int i; |
802 | xmlLocationSetPtr newset; |
803 | |
804 | newset = xmlXPtrLocationSetCreate(NULL); |
805 | if (newset == NULL) |
806 | return(ret); |
807 | |
808 | for (i = 0;i < set->nodeNr;i++) |
809 | xmlXPtrLocationSetAdd(newset, |
810 | xmlXPtrNewCollapsedRange(set->nodeTab[i])); |
811 | |
812 | ret->user = (void *) newset; |
813 | } |
814 | return(ret); |
815 | } |
816 | |
817 | /** |
818 | * xmlXPtrWrapLocationSet: |
819 | * @val: the LocationSet value |
820 | * |
821 | * Wrap the LocationSet @val in a new xmlXPathObjectPtr |
822 | * |
823 | * Returns the newly created object. |
824 | */ |
825 | xmlXPathObjectPtr |
826 | xmlXPtrWrapLocationSet(xmlLocationSetPtr val) { |
827 | xmlXPathObjectPtr ret; |
828 | |
829 | ret = (xmlXPathObjectPtr) xmlMalloc(sizeof(xmlXPathObject)); |
830 | if (ret == NULL) { |
831 | xmlXPtrErrMemory("allocating locationset" ); |
832 | return(NULL); |
833 | } |
834 | memset(ret, 0 , (size_t) sizeof(xmlXPathObject)); |
835 | ret->type = XPATH_LOCATIONSET; |
836 | ret->user = (void *) val; |
837 | return(ret); |
838 | } |
839 | |
840 | /************************************************************************ |
841 | * * |
842 | * The parser * |
843 | * * |
844 | ************************************************************************/ |
845 | |
846 | static void xmlXPtrEvalChildSeq(xmlXPathParserContextPtr ctxt, xmlChar *name); |
847 | |
848 | /* |
849 | * Macros for accessing the content. Those should be used only by the parser, |
850 | * and not exported. |
851 | * |
852 | * Dirty macros, i.e. one need to make assumption on the context to use them |
853 | * |
854 | * CUR_PTR return the current pointer to the xmlChar to be parsed. |
855 | * CUR returns the current xmlChar value, i.e. a 8 bit value |
856 | * in ISO-Latin or UTF-8. |
857 | * This should be used internally by the parser |
858 | * only to compare to ASCII values otherwise it would break when |
859 | * running with UTF-8 encoding. |
860 | * NXT(n) returns the n'th next xmlChar. Same as CUR is should be used only |
861 | * to compare on ASCII based substring. |
862 | * SKIP(n) Skip n xmlChar, and must also be used only to skip ASCII defined |
863 | * strings within the parser. |
864 | * CURRENT Returns the current char value, with the full decoding of |
865 | * UTF-8 if we are using this mode. It returns an int. |
866 | * NEXT Skip to the next character, this does the proper decoding |
867 | * in UTF-8 mode. It also pop-up unfinished entities on the fly. |
868 | * It returns the pointer to the current xmlChar. |
869 | */ |
870 | |
871 | #define CUR (*ctxt->cur) |
872 | #define SKIP(val) ctxt->cur += (val) |
873 | #define NXT(val) ctxt->cur[(val)] |
874 | #define CUR_PTR ctxt->cur |
875 | |
876 | #define SKIP_BLANKS \ |
877 | while (IS_BLANK_CH(*(ctxt->cur))) NEXT |
878 | |
879 | #define CURRENT (*ctxt->cur) |
880 | #define NEXT ((*ctxt->cur) ? ctxt->cur++: ctxt->cur) |
881 | |
882 | /* |
883 | * xmlXPtrGetChildNo: |
884 | * @ctxt: the XPointer Parser context |
885 | * @index: the child number |
886 | * |
887 | * Move the current node of the nodeset on the stack to the |
888 | * given child if found |
889 | */ |
890 | static void |
891 | xmlXPtrGetChildNo(xmlXPathParserContextPtr ctxt, int indx) { |
892 | xmlNodePtr cur = NULL; |
893 | xmlXPathObjectPtr obj; |
894 | xmlNodeSetPtr oldset; |
895 | |
896 | CHECK_TYPE(XPATH_NODESET); |
897 | obj = valuePop(ctxt); |
898 | oldset = obj->nodesetval; |
899 | if ((indx <= 0) || (oldset == NULL) || (oldset->nodeNr != 1)) { |
900 | xmlXPathFreeObject(obj); |
901 | valuePush(ctxt, xmlXPathNewNodeSet(NULL)); |
902 | return; |
903 | } |
904 | cur = xmlXPtrGetNthChild(oldset->nodeTab[0], indx); |
905 | if (cur == NULL) { |
906 | xmlXPathFreeObject(obj); |
907 | valuePush(ctxt, xmlXPathNewNodeSet(NULL)); |
908 | return; |
909 | } |
910 | oldset->nodeTab[0] = cur; |
911 | valuePush(ctxt, obj); |
912 | } |
913 | |
914 | /** |
915 | * xmlXPtrEvalXPtrPart: |
916 | * @ctxt: the XPointer Parser context |
917 | * @name: the preparsed Scheme for the XPtrPart |
918 | * |
919 | * XPtrPart ::= 'xpointer' '(' XPtrExpr ')' |
920 | * | Scheme '(' SchemeSpecificExpr ')' |
921 | * |
922 | * Scheme ::= NCName - 'xpointer' [VC: Non-XPointer schemes] |
923 | * |
924 | * SchemeSpecificExpr ::= StringWithBalancedParens |
925 | * |
926 | * StringWithBalancedParens ::= |
927 | * [^()]* ('(' StringWithBalancedParens ')' [^()]*)* |
928 | * [VC: Parenthesis escaping] |
929 | * |
930 | * XPtrExpr ::= Expr [VC: Parenthesis escaping] |
931 | * |
932 | * VC: Parenthesis escaping: |
933 | * The end of an XPointer part is signaled by the right parenthesis ")" |
934 | * character that is balanced with the left parenthesis "(" character |
935 | * that began the part. Any unbalanced parenthesis character inside the |
936 | * expression, even within literals, must be escaped with a circumflex (^) |
937 | * character preceding it. If the expression contains any literal |
938 | * occurrences of the circumflex, each must be escaped with an additional |
939 | * circumflex (that is, ^^). If the unescaped parentheses in the expression |
940 | * are not balanced, a syntax error results. |
941 | * |
942 | * Parse and evaluate an XPtrPart. Basically it generates the unescaped |
943 | * string and if the scheme is 'xpointer' it will call the XPath interpreter. |
944 | * |
945 | * TODO: there is no new scheme registration mechanism |
946 | */ |
947 | |
948 | static void |
949 | xmlXPtrEvalXPtrPart(xmlXPathParserContextPtr ctxt, xmlChar *name) { |
950 | xmlChar *buffer, *cur; |
951 | int len; |
952 | int level; |
953 | |
954 | if (name == NULL) |
955 | name = xmlXPathParseName(ctxt); |
956 | if (name == NULL) |
957 | XP_ERROR(XPATH_EXPR_ERROR); |
958 | |
959 | if (CUR != '(') { |
960 | xmlFree(name); |
961 | XP_ERROR(XPATH_EXPR_ERROR); |
962 | } |
963 | NEXT; |
964 | level = 1; |
965 | |
966 | len = xmlStrlen(ctxt->cur); |
967 | len++; |
968 | buffer = (xmlChar *) xmlMallocAtomic(len * sizeof (xmlChar)); |
969 | if (buffer == NULL) { |
970 | xmlXPtrErrMemory("allocating buffer" ); |
971 | xmlFree(name); |
972 | return; |
973 | } |
974 | |
975 | cur = buffer; |
976 | while (CUR != 0) { |
977 | if (CUR == ')') { |
978 | level--; |
979 | if (level == 0) { |
980 | NEXT; |
981 | break; |
982 | } |
983 | } else if (CUR == '(') { |
984 | level++; |
985 | } else if (CUR == '^') { |
986 | if ((NXT(1) == ')') || (NXT(1) == '(') || (NXT(1) == '^')) { |
987 | NEXT; |
988 | } |
989 | } |
990 | *cur++ = CUR; |
991 | NEXT; |
992 | } |
993 | *cur = 0; |
994 | |
995 | if ((level != 0) && (CUR == 0)) { |
996 | xmlFree(name); |
997 | xmlFree(buffer); |
998 | XP_ERROR(XPTR_SYNTAX_ERROR); |
999 | } |
1000 | |
1001 | if (xmlStrEqual(name, (xmlChar *) "xpointer" )) { |
1002 | const xmlChar *left = CUR_PTR; |
1003 | |
1004 | CUR_PTR = buffer; |
1005 | /* |
1006 | * To evaluate an xpointer scheme element (4.3) we need: |
1007 | * context initialized to the root |
1008 | * context position initalized to 1 |
1009 | * context size initialized to 1 |
1010 | */ |
1011 | ctxt->context->node = (xmlNodePtr)ctxt->context->doc; |
1012 | ctxt->context->proximityPosition = 1; |
1013 | ctxt->context->contextSize = 1; |
1014 | xmlXPathEvalExpr(ctxt); |
1015 | CUR_PTR=left; |
1016 | } else if (xmlStrEqual(name, (xmlChar *) "element" )) { |
1017 | const xmlChar *left = CUR_PTR; |
1018 | xmlChar *name2; |
1019 | |
1020 | CUR_PTR = buffer; |
1021 | if (buffer[0] == '/') { |
1022 | xmlXPathRoot(ctxt); |
1023 | xmlXPtrEvalChildSeq(ctxt, NULL); |
1024 | } else { |
1025 | name2 = xmlXPathParseName(ctxt); |
1026 | if (name2 == NULL) { |
1027 | CUR_PTR = left; |
1028 | xmlFree(buffer); |
1029 | xmlFree(name); |
1030 | XP_ERROR(XPATH_EXPR_ERROR); |
1031 | } |
1032 | xmlXPtrEvalChildSeq(ctxt, name2); |
1033 | } |
1034 | CUR_PTR = left; |
1035 | #ifdef XPTR_XMLNS_SCHEME |
1036 | } else if (xmlStrEqual(name, (xmlChar *) "xmlns" )) { |
1037 | const xmlChar *left = CUR_PTR; |
1038 | xmlChar *prefix; |
1039 | xmlChar *URI; |
1040 | xmlURIPtr value; |
1041 | |
1042 | CUR_PTR = buffer; |
1043 | prefix = xmlXPathParseNCName(ctxt); |
1044 | if (prefix == NULL) { |
1045 | xmlFree(buffer); |
1046 | xmlFree(name); |
1047 | XP_ERROR(XPTR_SYNTAX_ERROR); |
1048 | } |
1049 | SKIP_BLANKS; |
1050 | if (CUR != '=') { |
1051 | xmlFree(prefix); |
1052 | xmlFree(buffer); |
1053 | xmlFree(name); |
1054 | XP_ERROR(XPTR_SYNTAX_ERROR); |
1055 | } |
1056 | NEXT; |
1057 | SKIP_BLANKS; |
1058 | /* @@ check escaping in the XPointer WD */ |
1059 | |
1060 | value = xmlParseURI((const char *)ctxt->cur); |
1061 | if (value == NULL) { |
1062 | xmlFree(prefix); |
1063 | xmlFree(buffer); |
1064 | xmlFree(name); |
1065 | XP_ERROR(XPTR_SYNTAX_ERROR); |
1066 | } |
1067 | URI = xmlSaveUri(value); |
1068 | xmlFreeURI(value); |
1069 | if (URI == NULL) { |
1070 | xmlFree(prefix); |
1071 | xmlFree(buffer); |
1072 | xmlFree(name); |
1073 | XP_ERROR(XPATH_MEMORY_ERROR); |
1074 | } |
1075 | |
1076 | xmlXPathRegisterNs(ctxt->context, prefix, URI); |
1077 | CUR_PTR = left; |
1078 | xmlFree(URI); |
1079 | xmlFree(prefix); |
1080 | #endif /* XPTR_XMLNS_SCHEME */ |
1081 | } else { |
1082 | xmlXPtrErr(ctxt, XML_XPTR_UNKNOWN_SCHEME, |
1083 | "unsupported scheme '%s'\n" , name); |
1084 | } |
1085 | xmlFree(buffer); |
1086 | xmlFree(name); |
1087 | } |
1088 | |
1089 | /** |
1090 | * xmlXPtrEvalFullXPtr: |
1091 | * @ctxt: the XPointer Parser context |
1092 | * @name: the preparsed Scheme for the first XPtrPart |
1093 | * |
1094 | * FullXPtr ::= XPtrPart (S? XPtrPart)* |
1095 | * |
1096 | * As the specs says: |
1097 | * ----------- |
1098 | * When multiple XPtrParts are provided, they must be evaluated in |
1099 | * left-to-right order. If evaluation of one part fails, the nexti |
1100 | * is evaluated. The following conditions cause XPointer part failure: |
1101 | * |
1102 | * - An unknown scheme |
1103 | * - A scheme that does not locate any sub-resource present in the resource |
1104 | * - A scheme that is not applicable to the media type of the resource |
1105 | * |
1106 | * The XPointer application must consume a failed XPointer part and |
1107 | * attempt to evaluate the next one, if any. The result of the first |
1108 | * XPointer part whose evaluation succeeds is taken to be the fragment |
1109 | * located by the XPointer as a whole. If all the parts fail, the result |
1110 | * for the XPointer as a whole is a sub-resource error. |
1111 | * ----------- |
1112 | * |
1113 | * Parse and evaluate a Full XPtr i.e. possibly a cascade of XPath based |
1114 | * expressions or other schemes. |
1115 | */ |
1116 | static void |
1117 | xmlXPtrEvalFullXPtr(xmlXPathParserContextPtr ctxt, xmlChar *name) { |
1118 | if (name == NULL) |
1119 | name = xmlXPathParseName(ctxt); |
1120 | if (name == NULL) |
1121 | XP_ERROR(XPATH_EXPR_ERROR); |
1122 | while (name != NULL) { |
1123 | ctxt->error = XPATH_EXPRESSION_OK; |
1124 | xmlXPtrEvalXPtrPart(ctxt, name); |
1125 | |
1126 | /* in case of syntax error, break here */ |
1127 | if ((ctxt->error != XPATH_EXPRESSION_OK) && |
1128 | (ctxt->error != XML_XPTR_UNKNOWN_SCHEME)) |
1129 | return; |
1130 | |
1131 | /* |
1132 | * If the returned value is a non-empty nodeset |
1133 | * or location set, return here. |
1134 | */ |
1135 | if (ctxt->value != NULL) { |
1136 | xmlXPathObjectPtr obj = ctxt->value; |
1137 | |
1138 | switch (obj->type) { |
1139 | case XPATH_LOCATIONSET: { |
1140 | xmlLocationSetPtr loc = ctxt->value->user; |
1141 | if ((loc != NULL) && (loc->locNr > 0)) |
1142 | return; |
1143 | break; |
1144 | } |
1145 | case XPATH_NODESET: { |
1146 | xmlNodeSetPtr loc = ctxt->value->nodesetval; |
1147 | if ((loc != NULL) && (loc->nodeNr > 0)) |
1148 | return; |
1149 | break; |
1150 | } |
1151 | default: |
1152 | break; |
1153 | } |
1154 | |
1155 | /* |
1156 | * Evaluating to improper values is equivalent to |
1157 | * a sub-resource error, clean-up the stack |
1158 | */ |
1159 | do { |
1160 | obj = valuePop(ctxt); |
1161 | if (obj != NULL) { |
1162 | xmlXPathFreeObject(obj); |
1163 | } |
1164 | } while (obj != NULL); |
1165 | } |
1166 | |
1167 | /* |
1168 | * Is there another XPointer part. |
1169 | */ |
1170 | SKIP_BLANKS; |
1171 | name = xmlXPathParseName(ctxt); |
1172 | } |
1173 | } |
1174 | |
1175 | /** |
1176 | * xmlXPtrEvalChildSeq: |
1177 | * @ctxt: the XPointer Parser context |
1178 | * @name: a possible ID name of the child sequence |
1179 | * |
1180 | * ChildSeq ::= '/1' ('/' [0-9]*)* |
1181 | * | Name ('/' [0-9]*)+ |
1182 | * |
1183 | * Parse and evaluate a Child Sequence. This routine also handle the |
1184 | * case of a Bare Name used to get a document ID. |
1185 | */ |
1186 | static void |
1187 | xmlXPtrEvalChildSeq(xmlXPathParserContextPtr ctxt, xmlChar *name) { |
1188 | /* |
1189 | * XPointer don't allow by syntax to address in mutirooted trees |
1190 | * this might prove useful in some cases, warn about it. |
1191 | */ |
1192 | if ((name == NULL) && (CUR == '/') && (NXT(1) != '1')) { |
1193 | xmlXPtrErr(ctxt, XML_XPTR_CHILDSEQ_START, |
1194 | "warning: ChildSeq not starting by /1\n" , NULL); |
1195 | } |
1196 | |
1197 | if (name != NULL) { |
1198 | valuePush(ctxt, xmlXPathNewString(name)); |
1199 | xmlFree(name); |
1200 | xmlXPathIdFunction(ctxt, 1); |
1201 | CHECK_ERROR; |
1202 | } |
1203 | |
1204 | while (CUR == '/') { |
1205 | int child = 0; |
1206 | NEXT; |
1207 | |
1208 | while ((CUR >= '0') && (CUR <= '9')) { |
1209 | child = child * 10 + (CUR - '0'); |
1210 | NEXT; |
1211 | } |
1212 | xmlXPtrGetChildNo(ctxt, child); |
1213 | } |
1214 | } |
1215 | |
1216 | |
1217 | /** |
1218 | * xmlXPtrEvalXPointer: |
1219 | * @ctxt: the XPointer Parser context |
1220 | * |
1221 | * XPointer ::= Name |
1222 | * | ChildSeq |
1223 | * | FullXPtr |
1224 | * |
1225 | * Parse and evaluate an XPointer |
1226 | */ |
1227 | static void |
1228 | xmlXPtrEvalXPointer(xmlXPathParserContextPtr ctxt) { |
1229 | if (ctxt->valueTab == NULL) { |
1230 | /* Allocate the value stack */ |
1231 | ctxt->valueTab = (xmlXPathObjectPtr *) |
1232 | xmlMalloc(10 * sizeof(xmlXPathObjectPtr)); |
1233 | if (ctxt->valueTab == NULL) { |
1234 | xmlXPtrErrMemory("allocating evaluation context" ); |
1235 | return; |
1236 | } |
1237 | ctxt->valueNr = 0; |
1238 | ctxt->valueMax = 10; |
1239 | ctxt->value = NULL; |
1240 | ctxt->valueFrame = 0; |
1241 | } |
1242 | SKIP_BLANKS; |
1243 | if (CUR == '/') { |
1244 | xmlXPathRoot(ctxt); |
1245 | xmlXPtrEvalChildSeq(ctxt, NULL); |
1246 | } else { |
1247 | xmlChar *name; |
1248 | |
1249 | name = xmlXPathParseName(ctxt); |
1250 | if (name == NULL) |
1251 | XP_ERROR(XPATH_EXPR_ERROR); |
1252 | if (CUR == '(') { |
1253 | xmlXPtrEvalFullXPtr(ctxt, name); |
1254 | /* Short evaluation */ |
1255 | return; |
1256 | } else { |
1257 | /* this handle both Bare Names and Child Sequences */ |
1258 | xmlXPtrEvalChildSeq(ctxt, name); |
1259 | } |
1260 | } |
1261 | SKIP_BLANKS; |
1262 | if (CUR != 0) |
1263 | XP_ERROR(XPATH_EXPR_ERROR); |
1264 | } |
1265 | |
1266 | |
1267 | /************************************************************************ |
1268 | * * |
1269 | * General routines * |
1270 | * * |
1271 | ************************************************************************/ |
1272 | |
1273 | static |
1274 | void xmlXPtrStringRangeFunction(xmlXPathParserContextPtr ctxt, int nargs); |
1275 | static |
1276 | void xmlXPtrStartPointFunction(xmlXPathParserContextPtr ctxt, int nargs); |
1277 | static |
1278 | void xmlXPtrEndPointFunction(xmlXPathParserContextPtr ctxt, int nargs); |
1279 | static |
1280 | void xmlXPtrHereFunction(xmlXPathParserContextPtr ctxt, int nargs); |
1281 | static |
1282 | void xmlXPtrOriginFunction(xmlXPathParserContextPtr ctxt, int nargs); |
1283 | static |
1284 | void xmlXPtrRangeInsideFunction(xmlXPathParserContextPtr ctxt, int nargs); |
1285 | static |
1286 | void xmlXPtrRangeFunction(xmlXPathParserContextPtr ctxt, int nargs); |
1287 | |
1288 | /** |
1289 | * xmlXPtrNewContext: |
1290 | * @doc: the XML document |
1291 | * @here: the node that directly contains the XPointer being evaluated or NULL |
1292 | * @origin: the element from which a user or program initiated traversal of |
1293 | * the link, or NULL. |
1294 | * |
1295 | * Create a new XPointer context |
1296 | * |
1297 | * Returns the xmlXPathContext just allocated. |
1298 | */ |
1299 | xmlXPathContextPtr |
1300 | xmlXPtrNewContext(xmlDocPtr doc, xmlNodePtr here, xmlNodePtr origin) { |
1301 | xmlXPathContextPtr ret; |
1302 | |
1303 | ret = xmlXPathNewContext(doc); |
1304 | if (ret == NULL) |
1305 | return(ret); |
1306 | ret->xptr = 1; |
1307 | ret->here = here; |
1308 | ret->origin = origin; |
1309 | |
1310 | xmlXPathRegisterFunc(ret, (xmlChar *)"range" , |
1311 | xmlXPtrRangeFunction); |
1312 | xmlXPathRegisterFunc(ret, (xmlChar *)"range-inside" , |
1313 | xmlXPtrRangeInsideFunction); |
1314 | xmlXPathRegisterFunc(ret, (xmlChar *)"string-range" , |
1315 | xmlXPtrStringRangeFunction); |
1316 | xmlXPathRegisterFunc(ret, (xmlChar *)"start-point" , |
1317 | xmlXPtrStartPointFunction); |
1318 | xmlXPathRegisterFunc(ret, (xmlChar *)"end-point" , |
1319 | xmlXPtrEndPointFunction); |
1320 | xmlXPathRegisterFunc(ret, (xmlChar *)"here" , |
1321 | xmlXPtrHereFunction); |
1322 | xmlXPathRegisterFunc(ret, (xmlChar *)" origin" , |
1323 | xmlXPtrOriginFunction); |
1324 | |
1325 | return(ret); |
1326 | } |
1327 | |
1328 | /** |
1329 | * xmlXPtrEval: |
1330 | * @str: the XPointer expression |
1331 | * @ctx: the XPointer context |
1332 | * |
1333 | * Evaluate the XPath Location Path in the given context. |
1334 | * |
1335 | * Returns the xmlXPathObjectPtr resulting from the evaluation or NULL. |
1336 | * the caller has to free the object. |
1337 | */ |
1338 | xmlXPathObjectPtr |
1339 | xmlXPtrEval(const xmlChar *str, xmlXPathContextPtr ctx) { |
1340 | xmlXPathParserContextPtr ctxt; |
1341 | xmlXPathObjectPtr res = NULL, tmp; |
1342 | xmlXPathObjectPtr init = NULL; |
1343 | int stack = 0; |
1344 | |
1345 | xmlXPathInit(); |
1346 | |
1347 | if ((ctx == NULL) || (str == NULL)) |
1348 | return(NULL); |
1349 | |
1350 | ctxt = xmlXPathNewParserContext(str, ctx); |
1351 | if (ctxt == NULL) |
1352 | return(NULL); |
1353 | ctxt->xptr = 1; |
1354 | xmlXPtrEvalXPointer(ctxt); |
1355 | |
1356 | if ((ctxt->value != NULL) && |
1357 | (ctxt->value->type != XPATH_NODESET) && |
1358 | (ctxt->value->type != XPATH_LOCATIONSET)) { |
1359 | xmlXPtrErr(ctxt, XML_XPTR_EVAL_FAILED, |
1360 | "xmlXPtrEval: evaluation failed to return a node set\n" , |
1361 | NULL); |
1362 | } else { |
1363 | res = valuePop(ctxt); |
1364 | } |
1365 | |
1366 | do { |
1367 | tmp = valuePop(ctxt); |
1368 | if (tmp != NULL) { |
1369 | if (tmp != init) { |
1370 | if (tmp->type == XPATH_NODESET) { |
1371 | /* |
1372 | * Evaluation may push a root nodeset which is unused |
1373 | */ |
1374 | xmlNodeSetPtr set; |
1375 | set = tmp->nodesetval; |
1376 | if ((set == NULL) || (set->nodeNr != 1) || |
1377 | (set->nodeTab[0] != (xmlNodePtr) ctx->doc)) |
1378 | stack++; |
1379 | } else |
1380 | stack++; |
1381 | } |
1382 | xmlXPathFreeObject(tmp); |
1383 | } |
1384 | } while (tmp != NULL); |
1385 | if (stack != 0) { |
1386 | xmlXPtrErr(ctxt, XML_XPTR_EXTRA_OBJECTS, |
1387 | "xmlXPtrEval: object(s) left on the eval stack\n" , |
1388 | NULL); |
1389 | } |
1390 | if (ctxt->error != XPATH_EXPRESSION_OK) { |
1391 | xmlXPathFreeObject(res); |
1392 | res = NULL; |
1393 | } |
1394 | |
1395 | xmlXPathFreeParserContext(ctxt); |
1396 | return(res); |
1397 | } |
1398 | |
1399 | /** |
1400 | * xmlXPtrBuildRangeNodeList: |
1401 | * @range: a range object |
1402 | * |
1403 | * Build a node list tree copy of the range |
1404 | * |
1405 | * Returns an xmlNodePtr list or NULL. |
1406 | * the caller has to free the node tree. |
1407 | */ |
1408 | static xmlNodePtr |
1409 | xmlXPtrBuildRangeNodeList(xmlXPathObjectPtr range) { |
1410 | /* pointers to generated nodes */ |
1411 | xmlNodePtr list = NULL, last = NULL, parent = NULL, tmp; |
1412 | /* pointers to traversal nodes */ |
1413 | xmlNodePtr start, cur, end; |
1414 | int index1, index2; |
1415 | |
1416 | if (range == NULL) |
1417 | return(NULL); |
1418 | if (range->type != XPATH_RANGE) |
1419 | return(NULL); |
1420 | start = (xmlNodePtr) range->user; |
1421 | |
1422 | if ((start == NULL) || (start->type == XML_NAMESPACE_DECL)) |
1423 | return(NULL); |
1424 | end = range->user2; |
1425 | if (end == NULL) |
1426 | return(xmlCopyNode(start, 1)); |
1427 | if (end->type == XML_NAMESPACE_DECL) |
1428 | return(NULL); |
1429 | |
1430 | cur = start; |
1431 | index1 = range->index; |
1432 | index2 = range->index2; |
1433 | while (cur != NULL) { |
1434 | if (cur == end) { |
1435 | if (cur->type == XML_TEXT_NODE) { |
1436 | const xmlChar *content = cur->content; |
1437 | int len; |
1438 | |
1439 | if (content == NULL) { |
1440 | tmp = xmlNewTextLen(NULL, 0); |
1441 | } else { |
1442 | len = index2; |
1443 | if ((cur == start) && (index1 > 1)) { |
1444 | content += (index1 - 1); |
1445 | len -= (index1 - 1); |
1446 | index1 = 0; |
1447 | } else { |
1448 | len = index2; |
1449 | } |
1450 | tmp = xmlNewTextLen(content, len); |
1451 | } |
1452 | /* single sub text node selection */ |
1453 | if (list == NULL) |
1454 | return(tmp); |
1455 | /* prune and return full set */ |
1456 | if (last != NULL) |
1457 | xmlAddNextSibling(last, tmp); |
1458 | else |
1459 | xmlAddChild(parent, tmp); |
1460 | return(list); |
1461 | } else { |
1462 | tmp = xmlCopyNode(cur, 0); |
1463 | if (list == NULL) |
1464 | list = tmp; |
1465 | else { |
1466 | if (last != NULL) |
1467 | xmlAddNextSibling(last, tmp); |
1468 | else |
1469 | xmlAddChild(parent, tmp); |
1470 | } |
1471 | last = NULL; |
1472 | parent = tmp; |
1473 | |
1474 | if (index2 > 1) { |
1475 | end = xmlXPtrGetNthChild(cur, index2 - 1); |
1476 | index2 = 0; |
1477 | } |
1478 | if ((cur == start) && (index1 > 1)) { |
1479 | cur = xmlXPtrGetNthChild(cur, index1 - 1); |
1480 | index1 = 0; |
1481 | } else { |
1482 | cur = cur->children; |
1483 | } |
1484 | /* |
1485 | * Now gather the remaining nodes from cur to end |
1486 | */ |
1487 | continue; /* while */ |
1488 | } |
1489 | } else if ((cur == start) && |
1490 | (list == NULL) /* looks superfluous but ... */ ) { |
1491 | if ((cur->type == XML_TEXT_NODE) || |
1492 | (cur->type == XML_CDATA_SECTION_NODE)) { |
1493 | const xmlChar *content = cur->content; |
1494 | |
1495 | if (content == NULL) { |
1496 | tmp = xmlNewTextLen(NULL, 0); |
1497 | } else { |
1498 | if (index1 > 1) { |
1499 | content += (index1 - 1); |
1500 | } |
1501 | tmp = xmlNewText(content); |
1502 | } |
1503 | last = list = tmp; |
1504 | } else { |
1505 | if ((cur == start) && (index1 > 1)) { |
1506 | tmp = xmlCopyNode(cur, 0); |
1507 | list = tmp; |
1508 | parent = tmp; |
1509 | last = NULL; |
1510 | cur = xmlXPtrGetNthChild(cur, index1 - 1); |
1511 | index1 = 0; |
1512 | /* |
1513 | * Now gather the remaining nodes from cur to end |
1514 | */ |
1515 | continue; /* while */ |
1516 | } |
1517 | tmp = xmlCopyNode(cur, 1); |
1518 | list = tmp; |
1519 | parent = NULL; |
1520 | last = tmp; |
1521 | } |
1522 | } else { |
1523 | tmp = NULL; |
1524 | switch (cur->type) { |
1525 | case XML_DTD_NODE: |
1526 | case XML_ELEMENT_DECL: |
1527 | case XML_ATTRIBUTE_DECL: |
1528 | case XML_ENTITY_NODE: |
1529 | /* Do not copy DTD informations */ |
1530 | break; |
1531 | case XML_ENTITY_DECL: |
1532 | TODO /* handle crossing entities -> stack needed */ |
1533 | break; |
1534 | case XML_XINCLUDE_START: |
1535 | case XML_XINCLUDE_END: |
1536 | /* don't consider it part of the tree content */ |
1537 | break; |
1538 | case XML_ATTRIBUTE_NODE: |
1539 | /* Humm, should not happen ! */ |
1540 | STRANGE |
1541 | break; |
1542 | default: |
1543 | tmp = xmlCopyNode(cur, 1); |
1544 | break; |
1545 | } |
1546 | if (tmp != NULL) { |
1547 | if ((list == NULL) || ((last == NULL) && (parent == NULL))) { |
1548 | STRANGE |
1549 | return(NULL); |
1550 | } |
1551 | if (last != NULL) |
1552 | xmlAddNextSibling(last, tmp); |
1553 | else { |
1554 | xmlAddChild(parent, tmp); |
1555 | last = tmp; |
1556 | } |
1557 | } |
1558 | } |
1559 | /* |
1560 | * Skip to next node in document order |
1561 | */ |
1562 | if ((list == NULL) || ((last == NULL) && (parent == NULL))) { |
1563 | STRANGE |
1564 | return(NULL); |
1565 | } |
1566 | cur = xmlXPtrAdvanceNode(cur, NULL); |
1567 | } |
1568 | return(list); |
1569 | } |
1570 | |
1571 | /** |
1572 | * xmlXPtrBuildNodeList: |
1573 | * @obj: the XPointer result from the evaluation. |
1574 | * |
1575 | * Build a node list tree copy of the XPointer result. |
1576 | * This will drop Attributes and Namespace declarations. |
1577 | * |
1578 | * Returns an xmlNodePtr list or NULL. |
1579 | * the caller has to free the node tree. |
1580 | */ |
1581 | xmlNodePtr |
1582 | xmlXPtrBuildNodeList(xmlXPathObjectPtr obj) { |
1583 | xmlNodePtr list = NULL, last = NULL; |
1584 | int i; |
1585 | |
1586 | if (obj == NULL) |
1587 | return(NULL); |
1588 | switch (obj->type) { |
1589 | case XPATH_NODESET: { |
1590 | xmlNodeSetPtr set = obj->nodesetval; |
1591 | if (set == NULL) |
1592 | return(NULL); |
1593 | for (i = 0;i < set->nodeNr;i++) { |
1594 | if (set->nodeTab[i] == NULL) |
1595 | continue; |
1596 | switch (set->nodeTab[i]->type) { |
1597 | case XML_TEXT_NODE: |
1598 | case XML_CDATA_SECTION_NODE: |
1599 | case XML_ELEMENT_NODE: |
1600 | case XML_ENTITY_REF_NODE: |
1601 | case XML_ENTITY_NODE: |
1602 | case XML_PI_NODE: |
1603 | case XML_COMMENT_NODE: |
1604 | case XML_DOCUMENT_NODE: |
1605 | case XML_HTML_DOCUMENT_NODE: |
1606 | #ifdef LIBXML_DOCB_ENABLED |
1607 | case XML_DOCB_DOCUMENT_NODE: |
1608 | #endif |
1609 | case XML_XINCLUDE_START: |
1610 | case XML_XINCLUDE_END: |
1611 | break; |
1612 | case XML_ATTRIBUTE_NODE: |
1613 | case XML_NAMESPACE_DECL: |
1614 | case XML_DOCUMENT_TYPE_NODE: |
1615 | case XML_DOCUMENT_FRAG_NODE: |
1616 | case XML_NOTATION_NODE: |
1617 | case XML_DTD_NODE: |
1618 | case XML_ELEMENT_DECL: |
1619 | case XML_ATTRIBUTE_DECL: |
1620 | case XML_ENTITY_DECL: |
1621 | continue; /* for */ |
1622 | } |
1623 | if (last == NULL) |
1624 | list = last = xmlCopyNode(set->nodeTab[i], 1); |
1625 | else { |
1626 | xmlAddNextSibling(last, xmlCopyNode(set->nodeTab[i], 1)); |
1627 | if (last->next != NULL) |
1628 | last = last->next; |
1629 | } |
1630 | } |
1631 | break; |
1632 | } |
1633 | case XPATH_LOCATIONSET: { |
1634 | xmlLocationSetPtr set = (xmlLocationSetPtr) obj->user; |
1635 | if (set == NULL) |
1636 | return(NULL); |
1637 | for (i = 0;i < set->locNr;i++) { |
1638 | if (last == NULL) |
1639 | list = last = xmlXPtrBuildNodeList(set->locTab[i]); |
1640 | else |
1641 | xmlAddNextSibling(last, |
1642 | xmlXPtrBuildNodeList(set->locTab[i])); |
1643 | if (last != NULL) { |
1644 | while (last->next != NULL) |
1645 | last = last->next; |
1646 | } |
1647 | } |
1648 | break; |
1649 | } |
1650 | case XPATH_RANGE: |
1651 | return(xmlXPtrBuildRangeNodeList(obj)); |
1652 | case XPATH_POINT: |
1653 | return(xmlCopyNode(obj->user, 0)); |
1654 | default: |
1655 | break; |
1656 | } |
1657 | return(list); |
1658 | } |
1659 | |
1660 | /************************************************************************ |
1661 | * * |
1662 | * XPointer functions * |
1663 | * * |
1664 | ************************************************************************/ |
1665 | |
1666 | /** |
1667 | * xmlXPtrNbLocChildren: |
1668 | * @node: an xmlNodePtr |
1669 | * |
1670 | * Count the number of location children of @node or the length of the |
1671 | * string value in case of text/PI/Comments nodes |
1672 | * |
1673 | * Returns the number of location children |
1674 | */ |
1675 | static int |
1676 | xmlXPtrNbLocChildren(xmlNodePtr node) { |
1677 | int ret = 0; |
1678 | if (node == NULL) |
1679 | return(-1); |
1680 | switch (node->type) { |
1681 | case XML_HTML_DOCUMENT_NODE: |
1682 | case XML_DOCUMENT_NODE: |
1683 | case XML_ELEMENT_NODE: |
1684 | node = node->children; |
1685 | while (node != NULL) { |
1686 | if (node->type == XML_ELEMENT_NODE) |
1687 | ret++; |
1688 | node = node->next; |
1689 | } |
1690 | break; |
1691 | case XML_ATTRIBUTE_NODE: |
1692 | return(-1); |
1693 | |
1694 | case XML_PI_NODE: |
1695 | case XML_COMMENT_NODE: |
1696 | case XML_TEXT_NODE: |
1697 | case XML_CDATA_SECTION_NODE: |
1698 | case XML_ENTITY_REF_NODE: |
1699 | ret = xmlStrlen(node->content); |
1700 | break; |
1701 | default: |
1702 | return(-1); |
1703 | } |
1704 | return(ret); |
1705 | } |
1706 | |
1707 | /** |
1708 | * xmlXPtrHereFunction: |
1709 | * @ctxt: the XPointer Parser context |
1710 | * @nargs: the number of args |
1711 | * |
1712 | * Function implementing here() operation |
1713 | * as described in 5.4.3 |
1714 | */ |
1715 | static void |
1716 | xmlXPtrHereFunction(xmlXPathParserContextPtr ctxt, int nargs) { |
1717 | CHECK_ARITY(0); |
1718 | |
1719 | if (ctxt->context->here == NULL) |
1720 | XP_ERROR(XPTR_SYNTAX_ERROR); |
1721 | |
1722 | valuePush(ctxt, xmlXPtrNewLocationSetNodes(ctxt->context->here, NULL)); |
1723 | } |
1724 | |
1725 | /** |
1726 | * xmlXPtrOriginFunction: |
1727 | * @ctxt: the XPointer Parser context |
1728 | * @nargs: the number of args |
1729 | * |
1730 | * Function implementing origin() operation |
1731 | * as described in 5.4.3 |
1732 | */ |
1733 | static void |
1734 | xmlXPtrOriginFunction(xmlXPathParserContextPtr ctxt, int nargs) { |
1735 | CHECK_ARITY(0); |
1736 | |
1737 | if (ctxt->context->origin == NULL) |
1738 | XP_ERROR(XPTR_SYNTAX_ERROR); |
1739 | |
1740 | valuePush(ctxt, xmlXPtrNewLocationSetNodes(ctxt->context->origin, NULL)); |
1741 | } |
1742 | |
1743 | /** |
1744 | * xmlXPtrStartPointFunction: |
1745 | * @ctxt: the XPointer Parser context |
1746 | * @nargs: the number of args |
1747 | * |
1748 | * Function implementing start-point() operation |
1749 | * as described in 5.4.3 |
1750 | * ---------------- |
1751 | * location-set start-point(location-set) |
1752 | * |
1753 | * For each location x in the argument location-set, start-point adds a |
1754 | * location of type point to the result location-set. That point represents |
1755 | * the start point of location x and is determined by the following rules: |
1756 | * |
1757 | * - If x is of type point, the start point is x. |
1758 | * - If x is of type range, the start point is the start point of x. |
1759 | * - If x is of type root, element, text, comment, or processing instruction, |
1760 | * - the container node of the start point is x and the index is 0. |
1761 | * - If x is of type attribute or namespace, the function must signal a |
1762 | * syntax error. |
1763 | * ---------------- |
1764 | * |
1765 | */ |
1766 | static void |
1767 | xmlXPtrStartPointFunction(xmlXPathParserContextPtr ctxt, int nargs) { |
1768 | xmlXPathObjectPtr tmp, obj, point; |
1769 | xmlLocationSetPtr newset = NULL; |
1770 | xmlLocationSetPtr oldset = NULL; |
1771 | |
1772 | CHECK_ARITY(1); |
1773 | if ((ctxt->value == NULL) || |
1774 | ((ctxt->value->type != XPATH_LOCATIONSET) && |
1775 | (ctxt->value->type != XPATH_NODESET))) |
1776 | XP_ERROR(XPATH_INVALID_TYPE) |
1777 | |
1778 | obj = valuePop(ctxt); |
1779 | if (obj->type == XPATH_NODESET) { |
1780 | /* |
1781 | * First convert to a location set |
1782 | */ |
1783 | tmp = xmlXPtrNewLocationSetNodeSet(obj->nodesetval); |
1784 | xmlXPathFreeObject(obj); |
1785 | if (tmp == NULL) |
1786 | XP_ERROR(XPATH_MEMORY_ERROR) |
1787 | obj = tmp; |
1788 | } |
1789 | |
1790 | newset = xmlXPtrLocationSetCreate(NULL); |
1791 | if (newset == NULL) { |
1792 | xmlXPathFreeObject(obj); |
1793 | XP_ERROR(XPATH_MEMORY_ERROR); |
1794 | } |
1795 | oldset = (xmlLocationSetPtr) obj->user; |
1796 | if (oldset != NULL) { |
1797 | int i; |
1798 | |
1799 | for (i = 0; i < oldset->locNr; i++) { |
1800 | tmp = oldset->locTab[i]; |
1801 | if (tmp == NULL) |
1802 | continue; |
1803 | point = NULL; |
1804 | switch (tmp->type) { |
1805 | case XPATH_POINT: |
1806 | point = xmlXPtrNewPoint(tmp->user, tmp->index); |
1807 | break; |
1808 | case XPATH_RANGE: { |
1809 | xmlNodePtr node = tmp->user; |
1810 | if (node != NULL) { |
1811 | if ((node->type == XML_ATTRIBUTE_NODE) || |
1812 | (node->type == XML_NAMESPACE_DECL)) { |
1813 | xmlXPathFreeObject(obj); |
1814 | xmlXPtrFreeLocationSet(newset); |
1815 | XP_ERROR(XPTR_SYNTAX_ERROR); |
1816 | } |
1817 | point = xmlXPtrNewPoint(node, tmp->index); |
1818 | } |
1819 | break; |
1820 | } |
1821 | default: |
1822 | /*** Should we raise an error ? |
1823 | xmlXPathFreeObject(obj); |
1824 | xmlXPathFreeObject(newset); |
1825 | XP_ERROR(XPATH_INVALID_TYPE) |
1826 | ***/ |
1827 | break; |
1828 | } |
1829 | if (point != NULL) |
1830 | xmlXPtrLocationSetAdd(newset, point); |
1831 | } |
1832 | } |
1833 | xmlXPathFreeObject(obj); |
1834 | valuePush(ctxt, xmlXPtrWrapLocationSet(newset)); |
1835 | } |
1836 | |
1837 | /** |
1838 | * xmlXPtrEndPointFunction: |
1839 | * @ctxt: the XPointer Parser context |
1840 | * @nargs: the number of args |
1841 | * |
1842 | * Function implementing end-point() operation |
1843 | * as described in 5.4.3 |
1844 | * ---------------------------- |
1845 | * location-set end-point(location-set) |
1846 | * |
1847 | * For each location x in the argument location-set, end-point adds a |
1848 | * location of type point to the result location-set. That point represents |
1849 | * the end point of location x and is determined by the following rules: |
1850 | * |
1851 | * - If x is of type point, the resulting point is x. |
1852 | * - If x is of type range, the resulting point is the end point of x. |
1853 | * - If x is of type root or element, the container node of the resulting |
1854 | * point is x and the index is the number of location children of x. |
1855 | * - If x is of type text, comment, or processing instruction, the container |
1856 | * node of the resulting point is x and the index is the length of the |
1857 | * string-value of x. |
1858 | * - If x is of type attribute or namespace, the function must signal a |
1859 | * syntax error. |
1860 | * ---------------------------- |
1861 | */ |
1862 | static void |
1863 | xmlXPtrEndPointFunction(xmlXPathParserContextPtr ctxt, int nargs) { |
1864 | xmlXPathObjectPtr tmp, obj, point; |
1865 | xmlLocationSetPtr newset = NULL; |
1866 | xmlLocationSetPtr oldset = NULL; |
1867 | |
1868 | CHECK_ARITY(1); |
1869 | if ((ctxt->value == NULL) || |
1870 | ((ctxt->value->type != XPATH_LOCATIONSET) && |
1871 | (ctxt->value->type != XPATH_NODESET))) |
1872 | XP_ERROR(XPATH_INVALID_TYPE) |
1873 | |
1874 | obj = valuePop(ctxt); |
1875 | if (obj->type == XPATH_NODESET) { |
1876 | /* |
1877 | * First convert to a location set |
1878 | */ |
1879 | tmp = xmlXPtrNewLocationSetNodeSet(obj->nodesetval); |
1880 | xmlXPathFreeObject(obj); |
1881 | if (tmp == NULL) |
1882 | XP_ERROR(XPATH_MEMORY_ERROR) |
1883 | obj = tmp; |
1884 | } |
1885 | |
1886 | newset = xmlXPtrLocationSetCreate(NULL); |
1887 | if (newset == NULL) { |
1888 | xmlXPathFreeObject(obj); |
1889 | XP_ERROR(XPATH_MEMORY_ERROR); |
1890 | } |
1891 | oldset = (xmlLocationSetPtr) obj->user; |
1892 | if (oldset != NULL) { |
1893 | int i; |
1894 | |
1895 | for (i = 0; i < oldset->locNr; i++) { |
1896 | tmp = oldset->locTab[i]; |
1897 | if (tmp == NULL) |
1898 | continue; |
1899 | point = NULL; |
1900 | switch (tmp->type) { |
1901 | case XPATH_POINT: |
1902 | point = xmlXPtrNewPoint(tmp->user, tmp->index); |
1903 | break; |
1904 | case XPATH_RANGE: { |
1905 | xmlNodePtr node = tmp->user2; |
1906 | if (node != NULL) { |
1907 | if ((node->type == XML_ATTRIBUTE_NODE) || |
1908 | (node->type == XML_NAMESPACE_DECL)) { |
1909 | xmlXPathFreeObject(obj); |
1910 | xmlXPtrFreeLocationSet(newset); |
1911 | XP_ERROR(XPTR_SYNTAX_ERROR); |
1912 | } |
1913 | point = xmlXPtrNewPoint(node, tmp->index2); |
1914 | } else if (tmp->user == NULL) { |
1915 | point = xmlXPtrNewPoint(node, |
1916 | xmlXPtrNbLocChildren(node)); |
1917 | } |
1918 | break; |
1919 | } |
1920 | default: |
1921 | /*** Should we raise an error ? |
1922 | xmlXPathFreeObject(obj); |
1923 | xmlXPathFreeObject(newset); |
1924 | XP_ERROR(XPATH_INVALID_TYPE) |
1925 | ***/ |
1926 | break; |
1927 | } |
1928 | if (point != NULL) |
1929 | xmlXPtrLocationSetAdd(newset, point); |
1930 | } |
1931 | } |
1932 | xmlXPathFreeObject(obj); |
1933 | valuePush(ctxt, xmlXPtrWrapLocationSet(newset)); |
1934 | } |
1935 | |
1936 | |
1937 | /** |
1938 | * xmlXPtrCoveringRange: |
1939 | * @ctxt: the XPointer Parser context |
1940 | * @loc: the location for which the covering range must be computed |
1941 | * |
1942 | * A covering range is a range that wholly encompasses a location |
1943 | * Section 5.3.3. Covering Ranges for All Location Types |
1944 | * http://www.w3.org/TR/xptr#N2267 |
1945 | * |
1946 | * Returns a new location or NULL in case of error |
1947 | */ |
1948 | static xmlXPathObjectPtr |
1949 | xmlXPtrCoveringRange(xmlXPathParserContextPtr ctxt, xmlXPathObjectPtr loc) { |
1950 | if (loc == NULL) |
1951 | return(NULL); |
1952 | if ((ctxt == NULL) || (ctxt->context == NULL) || |
1953 | (ctxt->context->doc == NULL)) |
1954 | return(NULL); |
1955 | switch (loc->type) { |
1956 | case XPATH_POINT: |
1957 | return(xmlXPtrNewRange(loc->user, loc->index, |
1958 | loc->user, loc->index)); |
1959 | case XPATH_RANGE: |
1960 | if (loc->user2 != NULL) { |
1961 | return(xmlXPtrNewRange(loc->user, loc->index, |
1962 | loc->user2, loc->index2)); |
1963 | } else { |
1964 | xmlNodePtr node = (xmlNodePtr) loc->user; |
1965 | if (node == (xmlNodePtr) ctxt->context->doc) { |
1966 | return(xmlXPtrNewRange(node, 0, node, |
1967 | xmlXPtrGetArity(node))); |
1968 | } else { |
1969 | switch (node->type) { |
1970 | case XML_ATTRIBUTE_NODE: |
1971 | /* !!! our model is slightly different than XPath */ |
1972 | return(xmlXPtrNewRange(node, 0, node, |
1973 | xmlXPtrGetArity(node))); |
1974 | case XML_ELEMENT_NODE: |
1975 | case XML_TEXT_NODE: |
1976 | case XML_CDATA_SECTION_NODE: |
1977 | case XML_ENTITY_REF_NODE: |
1978 | case XML_PI_NODE: |
1979 | case XML_COMMENT_NODE: |
1980 | case XML_DOCUMENT_NODE: |
1981 | case XML_NOTATION_NODE: |
1982 | case XML_HTML_DOCUMENT_NODE: { |
1983 | int indx = xmlXPtrGetIndex(node); |
1984 | |
1985 | node = node->parent; |
1986 | return(xmlXPtrNewRange(node, indx - 1, |
1987 | node, indx + 1)); |
1988 | } |
1989 | default: |
1990 | return(NULL); |
1991 | } |
1992 | } |
1993 | } |
1994 | default: |
1995 | TODO /* missed one case ??? */ |
1996 | } |
1997 | return(NULL); |
1998 | } |
1999 | |
2000 | /** |
2001 | * xmlXPtrRangeFunction: |
2002 | * @ctxt: the XPointer Parser context |
2003 | * @nargs: the number of args |
2004 | * |
2005 | * Function implementing the range() function 5.4.3 |
2006 | * location-set range(location-set ) |
2007 | * |
2008 | * The range function returns ranges covering the locations in |
2009 | * the argument location-set. For each location x in the argument |
2010 | * location-set, a range location representing the covering range of |
2011 | * x is added to the result location-set. |
2012 | */ |
2013 | static void |
2014 | xmlXPtrRangeFunction(xmlXPathParserContextPtr ctxt, int nargs) { |
2015 | int i; |
2016 | xmlXPathObjectPtr set; |
2017 | xmlLocationSetPtr oldset; |
2018 | xmlLocationSetPtr newset; |
2019 | |
2020 | CHECK_ARITY(1); |
2021 | if ((ctxt->value == NULL) || |
2022 | ((ctxt->value->type != XPATH_LOCATIONSET) && |
2023 | (ctxt->value->type != XPATH_NODESET))) |
2024 | XP_ERROR(XPATH_INVALID_TYPE) |
2025 | |
2026 | set = valuePop(ctxt); |
2027 | if (set->type == XPATH_NODESET) { |
2028 | xmlXPathObjectPtr tmp; |
2029 | |
2030 | /* |
2031 | * First convert to a location set |
2032 | */ |
2033 | tmp = xmlXPtrNewLocationSetNodeSet(set->nodesetval); |
2034 | xmlXPathFreeObject(set); |
2035 | if (tmp == NULL) |
2036 | XP_ERROR(XPATH_MEMORY_ERROR) |
2037 | set = tmp; |
2038 | } |
2039 | oldset = (xmlLocationSetPtr) set->user; |
2040 | |
2041 | /* |
2042 | * The loop is to compute the covering range for each item and add it |
2043 | */ |
2044 | newset = xmlXPtrLocationSetCreate(NULL); |
2045 | if (newset == NULL) { |
2046 | xmlXPathFreeObject(set); |
2047 | XP_ERROR(XPATH_MEMORY_ERROR); |
2048 | } |
2049 | if (oldset != NULL) { |
2050 | for (i = 0;i < oldset->locNr;i++) { |
2051 | xmlXPtrLocationSetAdd(newset, |
2052 | xmlXPtrCoveringRange(ctxt, oldset->locTab[i])); |
2053 | } |
2054 | } |
2055 | |
2056 | /* |
2057 | * Save the new value and cleanup |
2058 | */ |
2059 | valuePush(ctxt, xmlXPtrWrapLocationSet(newset)); |
2060 | xmlXPathFreeObject(set); |
2061 | } |
2062 | |
2063 | /** |
2064 | * xmlXPtrInsideRange: |
2065 | * @ctxt: the XPointer Parser context |
2066 | * @loc: the location for which the inside range must be computed |
2067 | * |
2068 | * A inside range is a range described in the range-inside() description |
2069 | * |
2070 | * Returns a new location or NULL in case of error |
2071 | */ |
2072 | static xmlXPathObjectPtr |
2073 | xmlXPtrInsideRange(xmlXPathParserContextPtr ctxt, xmlXPathObjectPtr loc) { |
2074 | if (loc == NULL) |
2075 | return(NULL); |
2076 | if ((ctxt == NULL) || (ctxt->context == NULL) || |
2077 | (ctxt->context->doc == NULL)) |
2078 | return(NULL); |
2079 | switch (loc->type) { |
2080 | case XPATH_POINT: { |
2081 | xmlNodePtr node = (xmlNodePtr) loc->user; |
2082 | switch (node->type) { |
2083 | case XML_PI_NODE: |
2084 | case XML_COMMENT_NODE: |
2085 | case XML_TEXT_NODE: |
2086 | case XML_CDATA_SECTION_NODE: { |
2087 | if (node->content == NULL) { |
2088 | return(xmlXPtrNewRange(node, 0, node, 0)); |
2089 | } else { |
2090 | return(xmlXPtrNewRange(node, 0, node, |
2091 | xmlStrlen(node->content))); |
2092 | } |
2093 | } |
2094 | case XML_ATTRIBUTE_NODE: |
2095 | case XML_ELEMENT_NODE: |
2096 | case XML_ENTITY_REF_NODE: |
2097 | case XML_DOCUMENT_NODE: |
2098 | case XML_NOTATION_NODE: |
2099 | case XML_HTML_DOCUMENT_NODE: { |
2100 | return(xmlXPtrNewRange(node, 0, node, |
2101 | xmlXPtrGetArity(node))); |
2102 | } |
2103 | default: |
2104 | break; |
2105 | } |
2106 | return(NULL); |
2107 | } |
2108 | case XPATH_RANGE: { |
2109 | xmlNodePtr node = (xmlNodePtr) loc->user; |
2110 | if (loc->user2 != NULL) { |
2111 | return(xmlXPtrNewRange(node, loc->index, |
2112 | loc->user2, loc->index2)); |
2113 | } else { |
2114 | switch (node->type) { |
2115 | case XML_PI_NODE: |
2116 | case XML_COMMENT_NODE: |
2117 | case XML_TEXT_NODE: |
2118 | case XML_CDATA_SECTION_NODE: { |
2119 | if (node->content == NULL) { |
2120 | return(xmlXPtrNewRange(node, 0, node, 0)); |
2121 | } else { |
2122 | return(xmlXPtrNewRange(node, 0, node, |
2123 | xmlStrlen(node->content))); |
2124 | } |
2125 | } |
2126 | case XML_ATTRIBUTE_NODE: |
2127 | case XML_ELEMENT_NODE: |
2128 | case XML_ENTITY_REF_NODE: |
2129 | case XML_DOCUMENT_NODE: |
2130 | case XML_NOTATION_NODE: |
2131 | case XML_HTML_DOCUMENT_NODE: { |
2132 | return(xmlXPtrNewRange(node, 0, node, |
2133 | xmlXPtrGetArity(node))); |
2134 | } |
2135 | default: |
2136 | break; |
2137 | } |
2138 | return(NULL); |
2139 | } |
2140 | } |
2141 | default: |
2142 | TODO /* missed one case ??? */ |
2143 | } |
2144 | return(NULL); |
2145 | } |
2146 | |
2147 | /** |
2148 | * xmlXPtrRangeInsideFunction: |
2149 | * @ctxt: the XPointer Parser context |
2150 | * @nargs: the number of args |
2151 | * |
2152 | * Function implementing the range-inside() function 5.4.3 |
2153 | * location-set range-inside(location-set ) |
2154 | * |
2155 | * The range-inside function returns ranges covering the contents of |
2156 | * the locations in the argument location-set. For each location x in |
2157 | * the argument location-set, a range location is added to the result |
2158 | * location-set. If x is a range location, then x is added to the |
2159 | * result location-set. If x is not a range location, then x is used |
2160 | * as the container location of the start and end points of the range |
2161 | * location to be added; the index of the start point of the range is |
2162 | * zero; if the end point is a character point then its index is the |
2163 | * length of the string-value of x, and otherwise is the number of |
2164 | * location children of x. |
2165 | * |
2166 | */ |
2167 | static void |
2168 | xmlXPtrRangeInsideFunction(xmlXPathParserContextPtr ctxt, int nargs) { |
2169 | int i; |
2170 | xmlXPathObjectPtr set; |
2171 | xmlLocationSetPtr oldset; |
2172 | xmlLocationSetPtr newset; |
2173 | |
2174 | CHECK_ARITY(1); |
2175 | if ((ctxt->value == NULL) || |
2176 | ((ctxt->value->type != XPATH_LOCATIONSET) && |
2177 | (ctxt->value->type != XPATH_NODESET))) |
2178 | XP_ERROR(XPATH_INVALID_TYPE) |
2179 | |
2180 | set = valuePop(ctxt); |
2181 | if (set->type == XPATH_NODESET) { |
2182 | xmlXPathObjectPtr tmp; |
2183 | |
2184 | /* |
2185 | * First convert to a location set |
2186 | */ |
2187 | tmp = xmlXPtrNewLocationSetNodeSet(set->nodesetval); |
2188 | xmlXPathFreeObject(set); |
2189 | if (tmp == NULL) |
2190 | XP_ERROR(XPATH_MEMORY_ERROR) |
2191 | set = tmp; |
2192 | } |
2193 | oldset = (xmlLocationSetPtr) set->user; |
2194 | |
2195 | /* |
2196 | * The loop is to compute the covering range for each item and add it |
2197 | */ |
2198 | newset = xmlXPtrLocationSetCreate(NULL); |
2199 | if (newset == NULL) { |
2200 | xmlXPathFreeObject(set); |
2201 | XP_ERROR(XPATH_MEMORY_ERROR); |
2202 | } |
2203 | for (i = 0;i < oldset->locNr;i++) { |
2204 | xmlXPtrLocationSetAdd(newset, |
2205 | xmlXPtrInsideRange(ctxt, oldset->locTab[i])); |
2206 | } |
2207 | |
2208 | /* |
2209 | * Save the new value and cleanup |
2210 | */ |
2211 | valuePush(ctxt, xmlXPtrWrapLocationSet(newset)); |
2212 | xmlXPathFreeObject(set); |
2213 | } |
2214 | |
2215 | /** |
2216 | * xmlXPtrRangeToFunction: |
2217 | * @ctxt: the XPointer Parser context |
2218 | * @nargs: the number of args |
2219 | * |
2220 | * Implement the range-to() XPointer function |
2221 | * |
2222 | * Obsolete. range-to is not a real function but a special type of location |
2223 | * step which is handled in xpath.c. |
2224 | */ |
2225 | void |
2226 | xmlXPtrRangeToFunction(xmlXPathParserContextPtr ctxt, |
2227 | int nargs ATTRIBUTE_UNUSED) { |
2228 | XP_ERROR(XPATH_EXPR_ERROR); |
2229 | } |
2230 | |
2231 | /** |
2232 | * xmlXPtrAdvanceNode: |
2233 | * @cur: the node |
2234 | * @level: incremented/decremented to show level in tree |
2235 | * |
2236 | * Advance to the next element or text node in document order |
2237 | * TODO: add a stack for entering/exiting entities |
2238 | * |
2239 | * Returns -1 in case of failure, 0 otherwise |
2240 | */ |
2241 | xmlNodePtr |
2242 | xmlXPtrAdvanceNode(xmlNodePtr cur, int *level) { |
2243 | next: |
2244 | if ((cur == NULL) || (cur->type == XML_NAMESPACE_DECL)) |
2245 | return(NULL); |
2246 | if (cur->children != NULL) { |
2247 | cur = cur->children ; |
2248 | if (level != NULL) |
2249 | (*level)++; |
2250 | goto found; |
2251 | } |
2252 | skip: /* This label should only be needed if something is wrong! */ |
2253 | if (cur->next != NULL) { |
2254 | cur = cur->next; |
2255 | goto found; |
2256 | } |
2257 | do { |
2258 | cur = cur->parent; |
2259 | if (level != NULL) |
2260 | (*level)--; |
2261 | if (cur == NULL) return(NULL); |
2262 | if (cur->next != NULL) { |
2263 | cur = cur->next; |
2264 | goto found; |
2265 | } |
2266 | } while (cur != NULL); |
2267 | |
2268 | found: |
2269 | if ((cur->type != XML_ELEMENT_NODE) && |
2270 | (cur->type != XML_TEXT_NODE) && |
2271 | (cur->type != XML_DOCUMENT_NODE) && |
2272 | (cur->type != XML_HTML_DOCUMENT_NODE) && |
2273 | (cur->type != XML_CDATA_SECTION_NODE)) { |
2274 | if (cur->type == XML_ENTITY_REF_NODE) { /* Shouldn't happen */ |
2275 | TODO |
2276 | goto skip; |
2277 | } |
2278 | goto next; |
2279 | } |
2280 | return(cur); |
2281 | } |
2282 | |
2283 | /** |
2284 | * xmlXPtrAdvanceChar: |
2285 | * @node: the node |
2286 | * @indx: the indx |
2287 | * @bytes: the number of bytes |
2288 | * |
2289 | * Advance a point of the associated number of bytes (not UTF8 chars) |
2290 | * |
2291 | * Returns -1 in case of failure, 0 otherwise |
2292 | */ |
2293 | static int |
2294 | xmlXPtrAdvanceChar(xmlNodePtr *node, int *indx, int bytes) { |
2295 | xmlNodePtr cur; |
2296 | int pos; |
2297 | int len; |
2298 | |
2299 | if ((node == NULL) || (indx == NULL)) |
2300 | return(-1); |
2301 | cur = *node; |
2302 | if ((cur == NULL) || (cur->type == XML_NAMESPACE_DECL)) |
2303 | return(-1); |
2304 | pos = *indx; |
2305 | |
2306 | while (bytes >= 0) { |
2307 | /* |
2308 | * First position to the beginning of the first text node |
2309 | * corresponding to this point |
2310 | */ |
2311 | while ((cur != NULL) && |
2312 | ((cur->type == XML_ELEMENT_NODE) || |
2313 | (cur->type == XML_DOCUMENT_NODE) || |
2314 | (cur->type == XML_HTML_DOCUMENT_NODE))) { |
2315 | if (pos > 0) { |
2316 | cur = xmlXPtrGetNthChild(cur, pos); |
2317 | pos = 0; |
2318 | } else { |
2319 | cur = xmlXPtrAdvanceNode(cur, NULL); |
2320 | pos = 0; |
2321 | } |
2322 | } |
2323 | |
2324 | if (cur == NULL) { |
2325 | *node = NULL; |
2326 | *indx = 0; |
2327 | return(-1); |
2328 | } |
2329 | |
2330 | /* |
2331 | * if there is no move needed return the current value. |
2332 | */ |
2333 | if (pos == 0) pos = 1; |
2334 | if (bytes == 0) { |
2335 | *node = cur; |
2336 | *indx = pos; |
2337 | return(0); |
2338 | } |
2339 | /* |
2340 | * We should have a text (or cdata) node ... |
2341 | */ |
2342 | len = 0; |
2343 | if ((cur->type != XML_ELEMENT_NODE) && |
2344 | (cur->content != NULL)) { |
2345 | len = xmlStrlen(cur->content); |
2346 | } |
2347 | if (pos > len) { |
2348 | /* Strange, the indx in the text node is greater than it's len */ |
2349 | STRANGE |
2350 | pos = len; |
2351 | } |
2352 | if (pos + bytes >= len) { |
2353 | bytes -= (len - pos); |
2354 | cur = xmlXPtrAdvanceNode(cur, NULL); |
2355 | pos = 0; |
2356 | } else if (pos + bytes < len) { |
2357 | pos += bytes; |
2358 | *node = cur; |
2359 | *indx = pos; |
2360 | return(0); |
2361 | } |
2362 | } |
2363 | return(-1); |
2364 | } |
2365 | |
2366 | /** |
2367 | * xmlXPtrMatchString: |
2368 | * @string: the string to search |
2369 | * @start: the start textnode |
2370 | * @startindex: the start index |
2371 | * @end: the end textnode IN/OUT |
2372 | * @endindex: the end index IN/OUT |
2373 | * |
2374 | * Check whether the document contains @string at the position |
2375 | * (@start, @startindex) and limited by the (@end, @endindex) point |
2376 | * |
2377 | * Returns -1 in case of failure, 0 if not found, 1 if found in which case |
2378 | * (@start, @startindex) will indicate the position of the beginning |
2379 | * of the range and (@end, @endindex) will indicate the end |
2380 | * of the range |
2381 | */ |
2382 | static int |
2383 | xmlXPtrMatchString(const xmlChar *string, xmlNodePtr start, int startindex, |
2384 | xmlNodePtr *end, int *endindex) { |
2385 | xmlNodePtr cur; |
2386 | int pos; /* 0 based */ |
2387 | int len; /* in bytes */ |
2388 | int stringlen; /* in bytes */ |
2389 | int match; |
2390 | |
2391 | if (string == NULL) |
2392 | return(-1); |
2393 | if ((start == NULL) || (start->type == XML_NAMESPACE_DECL)) |
2394 | return(-1); |
2395 | if ((end == NULL) || (*end == NULL) || |
2396 | ((*end)->type == XML_NAMESPACE_DECL) || (endindex == NULL)) |
2397 | return(-1); |
2398 | cur = start; |
2399 | pos = startindex - 1; |
2400 | stringlen = xmlStrlen(string); |
2401 | |
2402 | while (stringlen > 0) { |
2403 | if ((cur == *end) && (pos + stringlen > *endindex)) |
2404 | return(0); |
2405 | |
2406 | if ((cur->type != XML_ELEMENT_NODE) && (cur->content != NULL)) { |
2407 | len = xmlStrlen(cur->content); |
2408 | if (len >= pos + stringlen) { |
2409 | match = (!xmlStrncmp(&cur->content[pos], string, stringlen)); |
2410 | if (match) { |
2411 | #ifdef DEBUG_RANGES |
2412 | xmlGenericError(xmlGenericErrorContext, |
2413 | "found range %d bytes at index %d of ->" , |
2414 | stringlen, pos + 1); |
2415 | xmlDebugDumpString(stdout, cur->content); |
2416 | xmlGenericError(xmlGenericErrorContext, "\n" ); |
2417 | #endif |
2418 | *end = cur; |
2419 | *endindex = pos + stringlen; |
2420 | return(1); |
2421 | } else { |
2422 | return(0); |
2423 | } |
2424 | } else { |
2425 | int sub = len - pos; |
2426 | match = (!xmlStrncmp(&cur->content[pos], string, sub)); |
2427 | if (match) { |
2428 | #ifdef DEBUG_RANGES |
2429 | xmlGenericError(xmlGenericErrorContext, |
2430 | "found subrange %d bytes at index %d of ->" , |
2431 | sub, pos + 1); |
2432 | xmlDebugDumpString(stdout, cur->content); |
2433 | xmlGenericError(xmlGenericErrorContext, "\n" ); |
2434 | #endif |
2435 | string = &string[sub]; |
2436 | stringlen -= sub; |
2437 | } else { |
2438 | return(0); |
2439 | } |
2440 | } |
2441 | } |
2442 | cur = xmlXPtrAdvanceNode(cur, NULL); |
2443 | if (cur == NULL) |
2444 | return(0); |
2445 | pos = 0; |
2446 | } |
2447 | return(1); |
2448 | } |
2449 | |
2450 | /** |
2451 | * xmlXPtrSearchString: |
2452 | * @string: the string to search |
2453 | * @start: the start textnode IN/OUT |
2454 | * @startindex: the start index IN/OUT |
2455 | * @end: the end textnode |
2456 | * @endindex: the end index |
2457 | * |
2458 | * Search the next occurrence of @string within the document content |
2459 | * until the (@end, @endindex) point is reached |
2460 | * |
2461 | * Returns -1 in case of failure, 0 if not found, 1 if found in which case |
2462 | * (@start, @startindex) will indicate the position of the beginning |
2463 | * of the range and (@end, @endindex) will indicate the end |
2464 | * of the range |
2465 | */ |
2466 | static int |
2467 | xmlXPtrSearchString(const xmlChar *string, xmlNodePtr *start, int *startindex, |
2468 | xmlNodePtr *end, int *endindex) { |
2469 | xmlNodePtr cur; |
2470 | const xmlChar *str; |
2471 | int pos; /* 0 based */ |
2472 | int len; /* in bytes */ |
2473 | xmlChar first; |
2474 | |
2475 | if (string == NULL) |
2476 | return(-1); |
2477 | if ((start == NULL) || (*start == NULL) || |
2478 | ((*start)->type == XML_NAMESPACE_DECL) || (startindex == NULL)) |
2479 | return(-1); |
2480 | if ((end == NULL) || (endindex == NULL)) |
2481 | return(-1); |
2482 | cur = *start; |
2483 | pos = *startindex - 1; |
2484 | first = string[0]; |
2485 | |
2486 | while (cur != NULL) { |
2487 | if ((cur->type != XML_ELEMENT_NODE) && (cur->content != NULL)) { |
2488 | len = xmlStrlen(cur->content); |
2489 | while (pos <= len) { |
2490 | if (first != 0) { |
2491 | str = xmlStrchr(&cur->content[pos], first); |
2492 | if (str != NULL) { |
2493 | pos = (str - (xmlChar *)(cur->content)); |
2494 | #ifdef DEBUG_RANGES |
2495 | xmlGenericError(xmlGenericErrorContext, |
2496 | "found '%c' at index %d of ->" , |
2497 | first, pos + 1); |
2498 | xmlDebugDumpString(stdout, cur->content); |
2499 | xmlGenericError(xmlGenericErrorContext, "\n" ); |
2500 | #endif |
2501 | if (xmlXPtrMatchString(string, cur, pos + 1, |
2502 | end, endindex)) { |
2503 | *start = cur; |
2504 | *startindex = pos + 1; |
2505 | return(1); |
2506 | } |
2507 | pos++; |
2508 | } else { |
2509 | pos = len + 1; |
2510 | } |
2511 | } else { |
2512 | /* |
2513 | * An empty string is considered to match before each |
2514 | * character of the string-value and after the final |
2515 | * character. |
2516 | */ |
2517 | #ifdef DEBUG_RANGES |
2518 | xmlGenericError(xmlGenericErrorContext, |
2519 | "found '' at index %d of ->" , |
2520 | pos + 1); |
2521 | xmlDebugDumpString(stdout, cur->content); |
2522 | xmlGenericError(xmlGenericErrorContext, "\n" ); |
2523 | #endif |
2524 | *start = cur; |
2525 | *startindex = pos + 1; |
2526 | *end = cur; |
2527 | *endindex = pos + 1; |
2528 | return(1); |
2529 | } |
2530 | } |
2531 | } |
2532 | if ((cur == *end) && (pos >= *endindex)) |
2533 | return(0); |
2534 | cur = xmlXPtrAdvanceNode(cur, NULL); |
2535 | if (cur == NULL) |
2536 | return(0); |
2537 | pos = 1; |
2538 | } |
2539 | return(0); |
2540 | } |
2541 | |
2542 | /** |
2543 | * xmlXPtrGetLastChar: |
2544 | * @node: the node |
2545 | * @index: the index |
2546 | * |
2547 | * Computes the point coordinates of the last char of this point |
2548 | * |
2549 | * Returns -1 in case of failure, 0 otherwise |
2550 | */ |
2551 | static int |
2552 | xmlXPtrGetLastChar(xmlNodePtr *node, int *indx) { |
2553 | xmlNodePtr cur; |
2554 | int pos, len = 0; |
2555 | |
2556 | if ((node == NULL) || (*node == NULL) || |
2557 | ((*node)->type == XML_NAMESPACE_DECL) || (indx == NULL)) |
2558 | return(-1); |
2559 | cur = *node; |
2560 | pos = *indx; |
2561 | |
2562 | if ((cur->type == XML_ELEMENT_NODE) || |
2563 | (cur->type == XML_DOCUMENT_NODE) || |
2564 | (cur->type == XML_HTML_DOCUMENT_NODE)) { |
2565 | if (pos > 0) { |
2566 | cur = xmlXPtrGetNthChild(cur, pos); |
2567 | } |
2568 | } |
2569 | while (cur != NULL) { |
2570 | if (cur->last != NULL) |
2571 | cur = cur->last; |
2572 | else if ((cur->type != XML_ELEMENT_NODE) && |
2573 | (cur->content != NULL)) { |
2574 | len = xmlStrlen(cur->content); |
2575 | break; |
2576 | } else { |
2577 | return(-1); |
2578 | } |
2579 | } |
2580 | if (cur == NULL) |
2581 | return(-1); |
2582 | *node = cur; |
2583 | *indx = len; |
2584 | return(0); |
2585 | } |
2586 | |
2587 | /** |
2588 | * xmlXPtrGetStartPoint: |
2589 | * @obj: an range |
2590 | * @node: the resulting node |
2591 | * @indx: the resulting index |
2592 | * |
2593 | * read the object and return the start point coordinates. |
2594 | * |
2595 | * Returns -1 in case of failure, 0 otherwise |
2596 | */ |
2597 | static int |
2598 | xmlXPtrGetStartPoint(xmlXPathObjectPtr obj, xmlNodePtr *node, int *indx) { |
2599 | if ((obj == NULL) || (node == NULL) || (indx == NULL)) |
2600 | return(-1); |
2601 | |
2602 | switch (obj->type) { |
2603 | case XPATH_POINT: |
2604 | *node = obj->user; |
2605 | if (obj->index <= 0) |
2606 | *indx = 0; |
2607 | else |
2608 | *indx = obj->index; |
2609 | return(0); |
2610 | case XPATH_RANGE: |
2611 | *node = obj->user; |
2612 | if (obj->index <= 0) |
2613 | *indx = 0; |
2614 | else |
2615 | *indx = obj->index; |
2616 | return(0); |
2617 | default: |
2618 | break; |
2619 | } |
2620 | return(-1); |
2621 | } |
2622 | |
2623 | /** |
2624 | * xmlXPtrGetEndPoint: |
2625 | * @obj: an range |
2626 | * @node: the resulting node |
2627 | * @indx: the resulting indx |
2628 | * |
2629 | * read the object and return the end point coordinates. |
2630 | * |
2631 | * Returns -1 in case of failure, 0 otherwise |
2632 | */ |
2633 | static int |
2634 | xmlXPtrGetEndPoint(xmlXPathObjectPtr obj, xmlNodePtr *node, int *indx) { |
2635 | if ((obj == NULL) || (node == NULL) || (indx == NULL)) |
2636 | return(-1); |
2637 | |
2638 | switch (obj->type) { |
2639 | case XPATH_POINT: |
2640 | *node = obj->user; |
2641 | if (obj->index <= 0) |
2642 | *indx = 0; |
2643 | else |
2644 | *indx = obj->index; |
2645 | return(0); |
2646 | case XPATH_RANGE: |
2647 | *node = obj->user; |
2648 | if (obj->index <= 0) |
2649 | *indx = 0; |
2650 | else |
2651 | *indx = obj->index; |
2652 | return(0); |
2653 | default: |
2654 | break; |
2655 | } |
2656 | return(-1); |
2657 | } |
2658 | |
2659 | /** |
2660 | * xmlXPtrStringRangeFunction: |
2661 | * @ctxt: the XPointer Parser context |
2662 | * @nargs: the number of args |
2663 | * |
2664 | * Function implementing the string-range() function |
2665 | * range as described in 5.4.2 |
2666 | * |
2667 | * ------------------------------ |
2668 | * [Definition: For each location in the location-set argument, |
2669 | * string-range returns a set of string ranges, a set of substrings in a |
2670 | * string. Specifically, the string-value of the location is searched for |
2671 | * substrings that match the string argument, and the resulting location-set |
2672 | * will contain a range location for each non-overlapping match.] |
2673 | * An empty string is considered to match before each character of the |
2674 | * string-value and after the final character. Whitespace in a string |
2675 | * is matched literally, with no normalization except that provided by |
2676 | * XML for line ends. The third argument gives the position of the first |
2677 | * character to be in the resulting range, relative to the start of the |
2678 | * match. The default value is 1, which makes the range start immediately |
2679 | * before the first character of the matched string. The fourth argument |
2680 | * gives the number of characters in the range; the default is that the |
2681 | * range extends to the end of the matched string. |
2682 | * |
2683 | * Element boundaries, as well as entire embedded nodes such as processing |
2684 | * instructions and comments, are ignored as defined in [XPath]. |
2685 | * |
2686 | * If the string in the second argument is not found in the string-value |
2687 | * of the location, or if a value in the third or fourth argument indicates |
2688 | * a string that is beyond the beginning or end of the document, the |
2689 | * expression fails. |
2690 | * |
2691 | * The points of the range-locations in the returned location-set will |
2692 | * all be character points. |
2693 | * ------------------------------ |
2694 | */ |
2695 | static void |
2696 | xmlXPtrStringRangeFunction(xmlXPathParserContextPtr ctxt, int nargs) { |
2697 | int i, startindex, endindex = 0, fendindex; |
2698 | xmlNodePtr start, end = 0, fend; |
2699 | xmlXPathObjectPtr set; |
2700 | xmlLocationSetPtr oldset; |
2701 | xmlLocationSetPtr newset; |
2702 | xmlXPathObjectPtr string; |
2703 | xmlXPathObjectPtr position = NULL; |
2704 | xmlXPathObjectPtr number = NULL; |
2705 | int found, pos = 0, num = 0; |
2706 | |
2707 | /* |
2708 | * Grab the arguments |
2709 | */ |
2710 | if ((nargs < 2) || (nargs > 4)) |
2711 | XP_ERROR(XPATH_INVALID_ARITY); |
2712 | |
2713 | if (nargs >= 4) { |
2714 | CHECK_TYPE(XPATH_NUMBER); |
2715 | number = valuePop(ctxt); |
2716 | if (number != NULL) |
2717 | num = (int) number->floatval; |
2718 | } |
2719 | if (nargs >= 3) { |
2720 | CHECK_TYPE(XPATH_NUMBER); |
2721 | position = valuePop(ctxt); |
2722 | if (position != NULL) |
2723 | pos = (int) position->floatval; |
2724 | } |
2725 | CHECK_TYPE(XPATH_STRING); |
2726 | string = valuePop(ctxt); |
2727 | if ((ctxt->value == NULL) || |
2728 | ((ctxt->value->type != XPATH_LOCATIONSET) && |
2729 | (ctxt->value->type != XPATH_NODESET))) |
2730 | XP_ERROR(XPATH_INVALID_TYPE) |
2731 | |
2732 | set = valuePop(ctxt); |
2733 | newset = xmlXPtrLocationSetCreate(NULL); |
2734 | if (newset == NULL) { |
2735 | xmlXPathFreeObject(set); |
2736 | XP_ERROR(XPATH_MEMORY_ERROR); |
2737 | } |
2738 | if (set->nodesetval == NULL) { |
2739 | goto error; |
2740 | } |
2741 | if (set->type == XPATH_NODESET) { |
2742 | xmlXPathObjectPtr tmp; |
2743 | |
2744 | /* |
2745 | * First convert to a location set |
2746 | */ |
2747 | tmp = xmlXPtrNewLocationSetNodeSet(set->nodesetval); |
2748 | xmlXPathFreeObject(set); |
2749 | if (tmp == NULL) |
2750 | XP_ERROR(XPATH_MEMORY_ERROR) |
2751 | set = tmp; |
2752 | } |
2753 | oldset = (xmlLocationSetPtr) set->user; |
2754 | |
2755 | /* |
2756 | * The loop is to search for each element in the location set |
2757 | * the list of location set corresponding to that search |
2758 | */ |
2759 | for (i = 0;i < oldset->locNr;i++) { |
2760 | #ifdef DEBUG_RANGES |
2761 | xmlXPathDebugDumpObject(stdout, oldset->locTab[i], 0); |
2762 | #endif |
2763 | |
2764 | xmlXPtrGetStartPoint(oldset->locTab[i], &start, &startindex); |
2765 | xmlXPtrGetEndPoint(oldset->locTab[i], &end, &endindex); |
2766 | xmlXPtrAdvanceChar(&start, &startindex, 0); |
2767 | xmlXPtrGetLastChar(&end, &endindex); |
2768 | |
2769 | #ifdef DEBUG_RANGES |
2770 | xmlGenericError(xmlGenericErrorContext, |
2771 | "from index %d of ->" , startindex); |
2772 | xmlDebugDumpString(stdout, start->content); |
2773 | xmlGenericError(xmlGenericErrorContext, "\n" ); |
2774 | xmlGenericError(xmlGenericErrorContext, |
2775 | "to index %d of ->" , endindex); |
2776 | xmlDebugDumpString(stdout, end->content); |
2777 | xmlGenericError(xmlGenericErrorContext, "\n" ); |
2778 | #endif |
2779 | do { |
2780 | fend = end; |
2781 | fendindex = endindex; |
2782 | found = xmlXPtrSearchString(string->stringval, &start, &startindex, |
2783 | &fend, &fendindex); |
2784 | if (found == 1) { |
2785 | if (position == NULL) { |
2786 | xmlXPtrLocationSetAdd(newset, |
2787 | xmlXPtrNewRange(start, startindex, fend, fendindex)); |
2788 | } else if (xmlXPtrAdvanceChar(&start, &startindex, |
2789 | pos - 1) == 0) { |
2790 | if ((number != NULL) && (num > 0)) { |
2791 | int rindx; |
2792 | xmlNodePtr rend; |
2793 | rend = start; |
2794 | rindx = startindex - 1; |
2795 | if (xmlXPtrAdvanceChar(&rend, &rindx, |
2796 | num) == 0) { |
2797 | xmlXPtrLocationSetAdd(newset, |
2798 | xmlXPtrNewRange(start, startindex, |
2799 | rend, rindx)); |
2800 | } |
2801 | } else if ((number != NULL) && (num <= 0)) { |
2802 | xmlXPtrLocationSetAdd(newset, |
2803 | xmlXPtrNewRange(start, startindex, |
2804 | start, startindex)); |
2805 | } else { |
2806 | xmlXPtrLocationSetAdd(newset, |
2807 | xmlXPtrNewRange(start, startindex, |
2808 | fend, fendindex)); |
2809 | } |
2810 | } |
2811 | start = fend; |
2812 | startindex = fendindex; |
2813 | if (string->stringval[0] == 0) |
2814 | startindex++; |
2815 | } |
2816 | } while (found == 1); |
2817 | } |
2818 | |
2819 | /* |
2820 | * Save the new value and cleanup |
2821 | */ |
2822 | error: |
2823 | valuePush(ctxt, xmlXPtrWrapLocationSet(newset)); |
2824 | xmlXPathFreeObject(set); |
2825 | xmlXPathFreeObject(string); |
2826 | if (position) xmlXPathFreeObject(position); |
2827 | if (number) xmlXPathFreeObject(number); |
2828 | } |
2829 | |
2830 | /** |
2831 | * xmlXPtrEvalRangePredicate: |
2832 | * @ctxt: the XPointer Parser context |
2833 | * |
2834 | * [8] Predicate ::= '[' PredicateExpr ']' |
2835 | * [9] PredicateExpr ::= Expr |
2836 | * |
2837 | * Evaluate a predicate as in xmlXPathEvalPredicate() but for |
2838 | * a Location Set instead of a node set |
2839 | */ |
2840 | void |
2841 | xmlXPtrEvalRangePredicate(xmlXPathParserContextPtr ctxt) { |
2842 | const xmlChar *cur; |
2843 | xmlXPathObjectPtr res; |
2844 | xmlXPathObjectPtr obj, tmp; |
2845 | xmlLocationSetPtr newset = NULL; |
2846 | xmlLocationSetPtr oldset; |
2847 | int i; |
2848 | |
2849 | if (ctxt == NULL) return; |
2850 | |
2851 | SKIP_BLANKS; |
2852 | if (CUR != '[') { |
2853 | XP_ERROR(XPATH_INVALID_PREDICATE_ERROR); |
2854 | } |
2855 | NEXT; |
2856 | SKIP_BLANKS; |
2857 | |
2858 | /* |
2859 | * Extract the old set, and then evaluate the result of the |
2860 | * expression for all the element in the set. use it to grow |
2861 | * up a new set. |
2862 | */ |
2863 | CHECK_TYPE(XPATH_LOCATIONSET); |
2864 | obj = valuePop(ctxt); |
2865 | oldset = obj->user; |
2866 | ctxt->context->node = NULL; |
2867 | |
2868 | if ((oldset == NULL) || (oldset->locNr == 0)) { |
2869 | ctxt->context->contextSize = 0; |
2870 | ctxt->context->proximityPosition = 0; |
2871 | xmlXPathEvalExpr(ctxt); |
2872 | res = valuePop(ctxt); |
2873 | if (res != NULL) |
2874 | xmlXPathFreeObject(res); |
2875 | valuePush(ctxt, obj); |
2876 | CHECK_ERROR; |
2877 | } else { |
2878 | /* |
2879 | * Save the expression pointer since we will have to evaluate |
2880 | * it multiple times. Initialize the new set. |
2881 | */ |
2882 | cur = ctxt->cur; |
2883 | newset = xmlXPtrLocationSetCreate(NULL); |
2884 | |
2885 | for (i = 0; i < oldset->locNr; i++) { |
2886 | ctxt->cur = cur; |
2887 | |
2888 | /* |
2889 | * Run the evaluation with a node list made of a single item |
2890 | * in the nodeset. |
2891 | */ |
2892 | ctxt->context->node = oldset->locTab[i]->user; |
2893 | tmp = xmlXPathNewNodeSet(ctxt->context->node); |
2894 | valuePush(ctxt, tmp); |
2895 | ctxt->context->contextSize = oldset->locNr; |
2896 | ctxt->context->proximityPosition = i + 1; |
2897 | |
2898 | xmlXPathEvalExpr(ctxt); |
2899 | CHECK_ERROR; |
2900 | |
2901 | /* |
2902 | * The result of the evaluation need to be tested to |
2903 | * decided whether the filter succeeded or not |
2904 | */ |
2905 | res = valuePop(ctxt); |
2906 | if (xmlXPathEvaluatePredicateResult(ctxt, res)) { |
2907 | xmlXPtrLocationSetAdd(newset, |
2908 | xmlXPathObjectCopy(oldset->locTab[i])); |
2909 | } |
2910 | |
2911 | /* |
2912 | * Cleanup |
2913 | */ |
2914 | if (res != NULL) |
2915 | xmlXPathFreeObject(res); |
2916 | if (ctxt->value == tmp) { |
2917 | res = valuePop(ctxt); |
2918 | xmlXPathFreeObject(res); |
2919 | } |
2920 | |
2921 | ctxt->context->node = NULL; |
2922 | } |
2923 | |
2924 | /* |
2925 | * The result is used as the new evaluation set. |
2926 | */ |
2927 | xmlXPathFreeObject(obj); |
2928 | ctxt->context->node = NULL; |
2929 | ctxt->context->contextSize = -1; |
2930 | ctxt->context->proximityPosition = -1; |
2931 | valuePush(ctxt, xmlXPtrWrapLocationSet(newset)); |
2932 | } |
2933 | if (CUR != ']') { |
2934 | XP_ERROR(XPATH_INVALID_PREDICATE_ERROR); |
2935 | } |
2936 | |
2937 | NEXT; |
2938 | SKIP_BLANKS; |
2939 | } |
2940 | |
2941 | #define bottom_xpointer |
2942 | #include "elfgcchack.h" |
2943 | #endif |
2944 | |
2945 | |