1 /*
2 * namespaces.c: Implementation of the XSLT namespaces handling
3 *
4 * Reference:
5 * http://www.w3.org/TR/1999/REC-xslt-19991116
6 *
7 * See Copyright for the status of this software.
8 *
9 * daniel@veillard.com
10 */
11
12 #define IN_LIBXSLT
13 #include "libxslt.h"
14
15 #include <string.h>
16
17 #ifdef HAVE_SYS_TYPES_H
18 #include <sys/types.h>
19 #endif
20 #ifdef HAVE_MATH_H
21 #include <math.h>
22 #endif
23 #ifdef HAVE_FLOAT_H
24 #include <float.h>
25 #endif
26 #ifdef HAVE_IEEEFP_H
27 #include <ieeefp.h>
28 #endif
29 #ifdef HAVE_NAN_H
30 #include <nan.h>
31 #endif
32 #ifdef HAVE_CTYPE_H
33 #include <ctype.h>
34 #endif
35 #ifndef XSLT_NEED_TRIO
36 #include <stdio.h>
37 #else
38 #include <trio.h>
39 #endif
40
41 #include <libxml/xmlmemory.h>
42 #include <libxml/tree.h>
43 #include <libxml/hash.h>
44 #include <libxml/xmlerror.h>
45 #include <libxml/uri.h>
46 #include "xslt.h"
47 #include "xsltInternals.h"
48 #include "xsltutils.h"
49 #include "namespaces.h"
50 #include "imports.h"
51
52 /************************************************************************
53 * *
54 * Module interfaces *
55 * *
56 ************************************************************************/
57
58 #ifdef XSLT_REFACTORED
59 static xsltNsAliasPtr
60 xsltNewNsAlias(xsltCompilerCtxtPtr cctxt)
61 {
62 xsltNsAliasPtr ret;
63
64 if (cctxt == NULL)
65 return(NULL);
66
67 ret = (xsltNsAliasPtr) xmlMalloc(sizeof(xsltNsAlias));
68 if (ret == NULL) {
69 xsltTransformError(NULL, cctxt->style, NULL,
70 "Internal error in xsltNewNsAlias(): Memory allocation failed.\n");
71 cctxt->style->errors++;
72 return(NULL);
73 }
74 memset(ret, 0, sizeof(xsltNsAlias));
75 /*
76 * TODO: Store the item at current stylesheet-level.
77 */
78 ret->next = cctxt->nsAliases;
79 cctxt->nsAliases = ret;
80
81 return(ret);
82 }
83 #endif /* XSLT_REFACTORED */
84 /**
85 * xsltNamespaceAlias:
86 * @style: the XSLT stylesheet
87 * @node: the xsl:namespace-alias node
88 *
89 * Read the stylesheet-prefix and result-prefix attributes, register
90 * them as well as the corresponding namespace.
91 */
92 void
93 xsltNamespaceAlias(xsltStylesheetPtr style, xmlNodePtr node)
94 {
95 xmlChar *resultPrefix = NULL;
96 xmlChar *stylePrefix = NULL;
97 xmlNsPtr literalNs = NULL;
98 xmlNsPtr targetNs = NULL;
99
100 #ifdef XSLT_REFACTORED
101 xsltNsAliasPtr alias;
102
103 if ((style == NULL) || (node == NULL))
104 return;
105
106 /*
107 * SPEC XSLT 1.0:
108 * "If a namespace URI is declared to be an alias for multiple
109 * different namespace URIs, then the declaration with the highest
110 * import precedence is used. It is an error if there is more than
111 * one such declaration. An XSLT processor may signal the error;
112 * if it does not signal the error, it must recover by choosing,
113 * from amongst the declarations with the highest import precedence,
114 * the one that occurs last in the stylesheet."
115 *
116 * SPEC TODO: Check for the errors mentioned above.
117 */
118 /*
119 * NOTE that the XSLT 2.0 also *does* use the NULL namespace if
120 * "#default" is used and there's no default namespace is scope.
121 * I.e., this is *not* an error.
122 * Most XSLT 1.0 implementations work this way.
123 * The XSLT 1.0 spec has nothing to say on the subject.
124 */
125 /*
126 * Attribute "stylesheet-prefix".
127 */
128 stylePrefix = xmlGetNsProp(node, (const xmlChar *)"stylesheet-prefix", NULL);
129 if (stylePrefix == NULL) {
130 xsltTransformError(NULL, style, node,
131 "The attribute 'stylesheet-prefix' is missing.\n");
132 return;
133 }
134 if (xmlStrEqual(stylePrefix, (const xmlChar *)"#default"))
135 literalNs = xmlSearchNs(node->doc, node, NULL);
136 else {
137 literalNs = xmlSearchNs(node->doc, node, stylePrefix);
138 if (literalNs == NULL) {
139 xsltTransformError(NULL, style, node,
140 "Attribute 'stylesheet-prefix': There's no namespace "
141 "declaration in scope for the prefix '%s'.\n",
142 stylePrefix);
143 goto error;
144 }
145 }
146 /*
147 * Attribute "result-prefix".
148 */
149 resultPrefix = xmlGetNsProp(node, (const xmlChar *)"result-prefix", NULL);
150 if (resultPrefix == NULL) {
151 xsltTransformError(NULL, style, node,
152 "The attribute 'result-prefix' is missing.\n");
153 goto error;
154 }
155 if (xmlStrEqual(resultPrefix, (const xmlChar *)"#default"))
156 targetNs = xmlSearchNs(node->doc, node, NULL);
157 else {
158 targetNs = xmlSearchNs(node->doc, node, resultPrefix);
159
160 if (targetNs == NULL) {
161 xsltTransformError(NULL, style, node,
162 "Attribute 'result-prefix': There's no namespace "
163 "declaration in scope for the prefix '%s'.\n",
164 stylePrefix);
165 goto error;
166 }
167 }
168 /*
169 *
170 * Same alias for multiple different target namespace URIs:
171 * TODO: The one with the highest import precedence is used.
172 * Example:
173 * <xsl:namespace-alias stylesheet-prefix="foo"
174 * result-prefix="bar"/>
175 *
176 * <xsl:namespace-alias stylesheet-prefix="foo"
177 * result-prefix="zar"/>
178 *
179 * Same target namespace URI for multiple different aliases:
180 * All alias-definitions will be used.
181 * Example:
182 * <xsl:namespace-alias stylesheet-prefix="bar"
183 * result-prefix="foo"/>
184 *
185 * <xsl:namespace-alias stylesheet-prefix="zar"
186 * result-prefix="foo"/>
187 * Cases using #default:
188 * <xsl:namespace-alias stylesheet-prefix="#default"
189 * result-prefix="#default"/>
190 * TODO: Has this an effect at all?
191 *
192 * <xsl:namespace-alias stylesheet-prefix="foo"
193 * result-prefix="#default"/>
194 * From namespace to no namespace.
195 *
196 * <xsl:namespace-alias stylesheet-prefix="#default"
197 * result-prefix="foo"/>
198 * From no namespace to namespace.
199 */
200
201
202 /*
203 * Store the ns-node in the alias-object.
204 */
205 alias = xsltNewNsAlias(XSLT_CCTXT(style));
206 if (alias == NULL)
207 return;
208 alias->literalNs = literalNs;
209 alias->targetNs = targetNs;
210 XSLT_CCTXT(style)->hasNsAliases = 1;
211
212
213 #else /* XSLT_REFACTORED */
214 const xmlChar *literalNsName;
215 const xmlChar *targetNsName;
216
217
218 if ((style == NULL) || (node == NULL))
219 return;
220
221 stylePrefix = xmlGetNsProp(node, (const xmlChar *)"stylesheet-prefix", NULL);
222 if (stylePrefix == NULL) {
223 xsltTransformError(NULL, style, node,
224 "namespace-alias: stylesheet-prefix attribute missing\n");
225 return;
226 }
227 resultPrefix = xmlGetNsProp(node, (const xmlChar *)"result-prefix", NULL);
228 if (resultPrefix == NULL) {
229 xsltTransformError(NULL, style, node,
230 "namespace-alias: result-prefix attribute missing\n");
231 goto error;
232 }
233
234 if (xmlStrEqual(stylePrefix, (const xmlChar *)"#default")) {
235 literalNs = xmlSearchNs(node->doc, node, NULL);
236 if (literalNs == NULL) {
237 literalNsName = NULL;
238 } else
239 literalNsName = literalNs->href; /* Yes - set for nsAlias table */
240 } else {
241 literalNs = xmlSearchNs(node->doc, node, stylePrefix);
242
243 if ((literalNs == NULL) || (literalNs->href == NULL)) {
244 xsltTransformError(NULL, style, node,
245 "namespace-alias: prefix %s not bound to any namespace\n",
246 stylePrefix);
247 goto error;
248 } else
249 literalNsName = literalNs->href;
250 }
251
252 /*
253 * When "#default" is used for result, if a default namespace has not
254 * been explicitly declared the special value UNDEFINED_DEFAULT_NS is
255 * put into the nsAliases table
256 */
257 if (xmlStrEqual(resultPrefix, (const xmlChar *)"#default")) {
258 targetNs = xmlSearchNs(node->doc, node, NULL);
259 if (targetNs == NULL) {
260 targetNsName = UNDEFINED_DEFAULT_NS;
261 } else
262 targetNsName = targetNs->href;
263 } else {
264 targetNs = xmlSearchNs(node->doc, node, resultPrefix);
265
266 if ((targetNs == NULL) || (targetNs->href == NULL)) {
267 xsltTransformError(NULL, style, node,
268 "namespace-alias: prefix %s not bound to any namespace\n",
269 resultPrefix);
270 goto error;
271 } else
272 targetNsName = targetNs->href;
273 }
274 /*
275 * Special case: if #default is used for
276 * the stylesheet-prefix (literal namespace) and there's no default
277 * namespace in scope, we'll use style->defaultAlias for this.
278 */
279 if (literalNsName == NULL) {
280 if (targetNs != NULL) {
281 /*
282 * BUG TODO: Is it not sufficient to have only 1 field for
283 * this, since subsequently alias declarations will
284 * overwrite this.
285 * Example:
286 * <xsl:namespace-alias result-prefix="foo"
287 * stylesheet-prefix="#default"/>
288 * <xsl:namespace-alias result-prefix="bar"
289 * stylesheet-prefix="#default"/>
290 * The mapping for "foo" won't be visible anymore.
291 */
292 style->defaultAlias = targetNs->href;
293 }
294 } else {
295 if (style->nsAliases == NULL)
296 style->nsAliases = xmlHashCreate(10);
297 if (style->nsAliases == NULL) {
298 xsltTransformError(NULL, style, node,
299 "namespace-alias: cannot create hash table\n");
300 goto error;
301 }
302 xmlHashAddEntry((xmlHashTablePtr) style->nsAliases,
303 literalNsName, (void *) targetNsName);
304 }
305 #endif /* else of XSLT_REFACTORED */
306
307 error:
308 if (stylePrefix != NULL)
309 xmlFree(stylePrefix);
310 if (resultPrefix != NULL)
311 xmlFree(resultPrefix);
312 }
313
314 /**
315 * xsltGetSpecialNamespace:
316 * @ctxt: the transformation context
317 * @invocNode: the invoking node; e.g. a literal result element/attr;
318 * only used for error reports
319 * @nsName: the namespace name (or NULL)
320 * @nsPrefix: the suggested namespace prefix (or NULL)
321 * @target: the result element on which to anchor a namespace
322 *
323 * Find a matching (prefix and ns-name) ns-declaration
324 * for the requested @nsName and @nsPrefix in the result tree.
325 * If none is found then a new ns-declaration will be
326 * added to @resultElem. If, in this case, the given prefix is
327 * already in use, then a ns-declaration with a modified ns-prefix
328 * be we created. Note that this function's priority is to
329 * preserve ns-prefixes; it will only change a prefix if there's
330 * a namespace clash.
331 * If both @nsName and @nsPrefix are NULL, then this will try to
332 * "undeclare" a default namespace by declaring an xmlns="".
333 *
334 * Returns a namespace declaration or NULL.
335 */
336 xmlNsPtr
337 xsltGetSpecialNamespace(xsltTransformContextPtr ctxt, xmlNodePtr invocNode,
338 const xmlChar *nsName, const xmlChar *nsPrefix,
339 xmlNodePtr target)
340 {
341 xmlNsPtr ns;
342 int prefixOccupied = 0;
343
344 if ((ctxt == NULL) || (target == NULL) ||
345 (target->type != XML_ELEMENT_NODE))
346 return(NULL);
347
348 /*
349 * NOTE: Namespace exclusion and ns-aliasing is performed at
350 * compilation-time in the refactored code; so this need not be done
351 * here (it was in the old code).
352 * NOTE: @invocNode was named @cur in the old code and was documented to
353 * be an input node; since it was only used to anchor an error report
354 * somewhere, we can safely change this to @invocNode, which now
355 * will be the XSLT instruction (also a literal result element/attribute),
356 * which was responsible for this call.
357 */
358 /*
359 * OPTIMIZE TODO: This all could be optimized by keeping track of
360 * the ns-decls currently in-scope via a specialized context.
361 */
362 if ((nsPrefix == NULL) && ((nsName == NULL) || (nsName[0] == 0))) {
363 /*
364 * NOTE: the "undeclaration" of the default namespace was
365 * part of the logic of the old xsltGetSpecialNamespace() code,
366 * so we'll keep that mechanism.
367 * Related to the old code: bug #302020:
368 */
369 /*
370 * OPTIMIZE TODO: This all could be optimized by keeping track of
371 * the ns-decls currently in-scope via a specialized context.
372 */
373 /*
374 * Search on the result element itself.
375 */
376 if (target->nsDef != NULL) {
377 ns = target->nsDef;
378 do {
379 if (ns->prefix == NULL) {
380 if ((ns->href != NULL) && (ns->href[0] != 0)) {
381 /*
382 * Raise a namespace normalization error.
383 */
384 xsltTransformError(ctxt, NULL, invocNode,
385 "Namespace normalization error: Cannot undeclare "
386 "the default namespace, since the default namespace "
387 "'%s' is already declared on the result element "
388 "'%s'.\n", ns->href, target->name);
389 return(NULL);
390 } else {
391 /*
392 * The default namespace was undeclared on the
393 * result element.
394 */
395 return(NULL);
396 }
397 break;
398 }
399 ns = ns->next;
400 } while (ns != NULL);
401 }
402 if ((target->parent != NULL) &&
403 (target->parent->type == XML_ELEMENT_NODE))
404 {
405 /*
406 * The parent element is in no namespace, so assume
407 * that there is no default namespace in scope.
408 */
409 if (target->parent->ns == NULL)
410 return(NULL);
411
412 ns = xmlSearchNs(target->doc, target->parent,
413 NULL);
414 /*
415 * Fine if there's no default ns is scope, or if the
416 * default ns was undeclared.
417 */
418 if ((ns == NULL) || (ns->href == NULL) || (ns->href[0] == 0))
419 return(NULL);
420
421 /*
422 * Undeclare the default namespace.
423 */
424 xmlNewNs(target, BAD_CAST "", NULL);
425 /* TODO: Check result */
426 return(NULL);
427 }
428 return(NULL);
429 }
430 /*
431 * Handle the XML namespace.
432 * QUESTION: Is this faster than using xmlStrEqual() anyway?
433 */
434 if ((nsPrefix != NULL) &&
435 (nsPrefix[0] == 'x') && (nsPrefix[1] == 'm') &&
436 (nsPrefix[2] == 'l') && (nsPrefix[3] == 0))
437 {
438 return(xmlSearchNs(target->doc, target, nsPrefix));
439 }
440 /*
441 * First: search on the result element itself.
442 */
443 if (target->nsDef != NULL) {
444 ns = target->nsDef;
445 do {
446 if ((ns->prefix == NULL) == (nsPrefix == NULL)) {
447 if (ns->prefix == nsPrefix) {
448 if (xmlStrEqual(ns->href, nsName))
449 return(ns);
450 prefixOccupied = 1;
451 break;
452 } else if (xmlStrEqual(ns->prefix, nsPrefix)) {
453 if (xmlStrEqual(ns->href, nsName))
454 return(ns);
455 prefixOccupied = 1;
456 break;
457 }
458 }
459 ns = ns->next;
460 } while (ns != NULL);
461 }
462 if (prefixOccupied) {
463 /*
464 * If the ns-prefix is occupied by an other ns-decl on the
465 * result element, then this means:
466 * 1) The desired prefix is shadowed
467 * 2) There's no way around changing the prefix
468 *
469 * Try a desperate search for an in-scope ns-decl
470 * with a matching ns-name before we use the last option,
471 * which is to recreate the ns-decl with a modified prefix.
472 */
473 ns = xmlSearchNsByHref(target->doc, target, nsName);
474 if (ns != NULL)
475 return(ns);
476
477 /*
478 * Fallback to changing the prefix.
479 */
480 } else if ((target->parent != NULL) &&
481 (target->parent->type == XML_ELEMENT_NODE))
482 {
483 /*
484 * Try to find a matching ns-decl in the ancestor-axis.
485 *
486 * Check the common case: The parent element of the current
487 * result element is in the same namespace (with an equal ns-prefix).
488 */
489 if ((target->parent->ns != NULL) &&
490 ((target->parent->ns->prefix != NULL) == (nsPrefix != NULL)))
491 {
492 ns = target->parent->ns;
493
494 if (nsPrefix == NULL) {
495 if (xmlStrEqual(ns->href, nsName))
496 return(ns);
497 } else if (xmlStrEqual(ns->prefix, nsPrefix) &&
498 xmlStrEqual(ns->href, nsName))
499 {
500 return(ns);
501 }
502 }
503 /*
504 * Lookup the remaining in-scope namespaces.
505 */
506 ns = xmlSearchNs(target->doc, target->parent, nsPrefix);
507 if (ns != NULL) {
508 if (xmlStrEqual(ns->href, nsName))
509 return(ns);
510 /*
511 * Now check for a nasty case: We need to ensure that the new
512 * ns-decl won't shadow a prefix in-use by an existing attribute.
513 * <foo xmlns:a="urn:test:a">
514 * <bar a:a="val-a">
515 * <xsl:attribute xmlns:a="urn:test:b" name="a:b">
516 * val-b</xsl:attribute>
517 * </bar>
518 * </foo>
519 */
520 if (target->properties) {
521 xmlAttrPtr attr = target->properties;
522 do {
523 if ((attr->ns) &&
524 xmlStrEqual(attr->ns->prefix, nsPrefix))
525 {
526 /*
527 * Bad, this prefix is already in use.
528 * Since we'll change the prefix anyway, try
529 * a search for a matching ns-decl based on the
530 * namespace name.
531 */
532 ns = xmlSearchNsByHref(target->doc, target, nsName);
533 if (ns != NULL)
534 return(ns);
535 goto declare_new_prefix;
536 }
537 attr = attr->next;
538 } while (attr != NULL);
539 }
540 } else {
541 /*
542 * Either no matching ns-prefix was found or the namespace is
543 * shadowed.
544 * Create a new ns-decl on the current result element.
545 *
546 * Hmm, we could also try to reuse an in-scope
547 * namespace with a matching ns-name but a different
548 * ns-prefix.
549 * What has higher priority?
550 * 1) If keeping the prefix: create a new ns-decl.
551 * 2) If reusal: first lookup ns-names; then fallback
552 * to creation of a new ns-decl.
553 * REVISIT: this currently uses case 1) although
554 * the old way was use xmlSearchNsByHref() and to let change
555 * the prefix.
556 */
557 #if 0
558 ns = xmlSearchNsByHref(target->doc, target, nsName);
559 if (ns != NULL)
560 return(ns);
561 #endif
562 }
563 /*
564 * Create the ns-decl on the current result element.
565 */
566 ns = xmlNewNs(target, nsName, nsPrefix);
567 /* TODO: check errors */
568 return(ns);
569 } else {
570 /*
571 * This is either the root of the tree or something weird is going on.
572 */
573 ns = xmlNewNs(target, nsName, nsPrefix);
574 /* TODO: Check result */
575 return(ns);
576 }
577
578 declare_new_prefix:
579 /*
580 * Fallback: we need to generate a new prefix and declare the namespace
581 * on the result element.
582 */
583 {
584 xmlChar pref[30];
585 int counter = 1;
586
587 if (nsPrefix == NULL) {
588 nsPrefix = BAD_CAST "ns";
589 }
590
591 do {
592 snprintf((char *) pref, 30, "%s_%d", nsPrefix, counter++);
593 ns = xmlSearchNs(target->doc, target, BAD_CAST pref);
594 if (counter > 1000) {
595 xsltTransformError(ctxt, NULL, invocNode,
596 "Internal error in xsltAcquireResultInScopeNs(): "
597 "Failed to compute a unique ns-prefix for the "
598 "generated element");
599 return(NULL);
600 }
601 } while (ns != NULL);
602 ns = xmlNewNs(target, nsName, BAD_CAST pref);
603 /* TODO: Check result */
604 return(ns);
605 }
606 return(NULL);
607 }
608
609 /**
610 * xsltGetNamespace:
611 * @ctxt: a transformation context
612 * @cur: the input node
613 * @ns: the namespace
614 * @out: the output node (or its parent)
615 *
616 * Find a matching (prefix and ns-name) ns-declaration
617 * for the requested @ns->prefix and @ns->href in the result tree.
618 * If none is found then a new ns-declaration will be
619 * added to @resultElem. If, in this case, the given prefix is
620 * already in use, then a ns-declaration with a modified ns-prefix
621 * be we created.
622 *
623 * Called by:
624 * - xsltCopyPropList() (*not* anymore)
625 * - xsltShallowCopyElement()
626 * - xsltCopyTreeInternal() (*not* anymore)
627 * - xsltApplySequenceConstructor() (*not* in the refactored code),
628 * - xsltElement() (*not* anymore)
629 *
630 * Returns a namespace declaration or NULL in case of
631 * namespace fixup failures or API or internal errors.
632 */
633 xmlNsPtr
634 xsltGetNamespace(xsltTransformContextPtr ctxt, xmlNodePtr cur, xmlNsPtr ns,
635 xmlNodePtr out)
636 {
637
638 if (ns == NULL)
639 return(NULL);
640
641 #ifdef XSLT_REFACTORED
642 /*
643 * Namespace exclusion and ns-aliasing is performed at
644 * compilation-time in the refactored code.
645 * Additionally, aliasing is not intended for non Literal
646 * Result Elements.
647 */
648 return(xsltGetSpecialNamespace(ctxt, cur, ns->href, ns->prefix, out));
649 #else
650 {
651 xsltStylesheetPtr style;
652 const xmlChar *URI = NULL; /* the replacement URI */
653
654 if ((ctxt == NULL) || (cur == NULL) || (out == NULL))
655 return(NULL);
656
657 style = ctxt->style;
658 while (style != NULL) {
659 if (style->nsAliases != NULL)
660 URI = (const xmlChar *)
661 xmlHashLookup(style->nsAliases, ns->href);
662 if (URI != NULL)
663 break;
664
665 style = xsltNextImport(style);
666 }
667
668
669 if (URI == UNDEFINED_DEFAULT_NS) {
670 return(xsltGetSpecialNamespace(ctxt, cur, NULL, NULL, out));
671 #if 0
672 /*
673 * TODO: Removed, since wrong. If there was no default
674 * namespace in the stylesheet then this must resolve to
675 * the NULL namespace.
676 */
677 xmlNsPtr dflt;
678 dflt = xmlSearchNs(cur->doc, cur, NULL);
679 if (dflt != NULL)
680 URI = dflt->href;
681 else
682 return NULL;
683 #endif
684 } else if (URI == NULL)
685 URI = ns->href;
686
687 return(xsltGetSpecialNamespace(ctxt, cur, URI, ns->prefix, out));
688 }
689 #endif
690 }
691
692 /**
693 * xsltGetPlainNamespace:
694 * @ctxt: a transformation context
695 * @cur: the input node
696 * @ns: the namespace
697 * @out: the result element
698 *
699 * Obsolete.
700 * *Not* called by any Libxslt/Libexslt function.
701 * Exaclty the same as xsltGetNamespace().
702 *
703 * Returns a namespace declaration or NULL in case of
704 * namespace fixup failures or API or internal errors.
705 */
706 xmlNsPtr
707 xsltGetPlainNamespace(xsltTransformContextPtr ctxt, xmlNodePtr cur,
708 xmlNsPtr ns, xmlNodePtr out)
709 {
710 return(xsltGetNamespace(ctxt, cur, ns, out));
711 }
712
713 /**
714 * xsltCopyNamespaceList:
715 * @ctxt: a transformation context
716 * @node: the target node
717 * @cur: the first namespace
718 *
719 * Do a copy of an namespace list. If @node is non-NULL the
720 * new namespaces are added automatically. This handles namespaces
721 * aliases.
722 * This function is intended only for *internal* use at
723 * transformation-time for copying ns-declarations of Literal
724 * Result Elements.
725 *
726 * Called by:
727 * xsltCopyTreeInternal() (transform.c)
728 * xsltShallowCopyElem() (transform.c)
729 *
730 * REVISIT: This function won't be used in the refactored code.
731 *
732 * Returns: a new xmlNsPtr, or NULL in case of error.
733 */
734 xmlNsPtr
735 xsltCopyNamespaceList(xsltTransformContextPtr ctxt, xmlNodePtr node,
736 xmlNsPtr cur) {
737 xmlNsPtr ret = NULL, tmp;
738 xmlNsPtr p = NULL,q;
739
740 if (cur == NULL)
741 return(NULL);
742 if (cur->type != XML_NAMESPACE_DECL)
743 return(NULL);
744
745 /*
746 * One can add namespaces only on element nodes
747 */
748 if ((node != NULL) && (node->type != XML_ELEMENT_NODE))
749 node = NULL;
750
751 while (cur != NULL) {
752 if (cur->type != XML_NAMESPACE_DECL)
753 break;
754
755 /*
756 * Avoid duplicating namespace declarations in the tree if
757 * a matching declaration is in scope.
758 */
759 if (node != NULL) {
760 if ((node->ns != NULL) &&
761 (xmlStrEqual(node->ns->prefix, cur->prefix)) &&
762 (xmlStrEqual(node->ns->href, cur->href))) {
763 cur = cur->next;
764 continue;
765 }
766 tmp = xmlSearchNs(node->doc, node, cur->prefix);
767 if ((tmp != NULL) && (xmlStrEqual(tmp->href, cur->href))) {
768 cur = cur->next;
769 continue;
770 }
771 }
772 #ifdef XSLT_REFACTORED
773 /*
774 * Namespace exclusion and ns-aliasing is performed at
775 * compilation-time in the refactored code.
776 */
777 q = xmlNewNs(node, cur->href, cur->prefix);
778 if (p == NULL) {
779 ret = p = q;
780 } else {
781 p->next = q;
782 p = q;
783 }
784 #else
785 /*
786 * TODO: Remove this if the refactored code gets enabled.
787 */
788 if (!xmlStrEqual(cur->href, XSLT_NAMESPACE)) {
789 const xmlChar *URI;
790 /* TODO apply cascading */
791 URI = (const xmlChar *) xmlHashLookup(ctxt->style->nsAliases,
792 cur->href);
793 if (URI == UNDEFINED_DEFAULT_NS)
794 continue;
795 if (URI != NULL) {
796 q = xmlNewNs(node, URI, cur->prefix);
797 } else {
798 q = xmlNewNs(node, cur->href, cur->prefix);
799 }
800 if (p == NULL) {
801 ret = p = q;
802 } else {
803 p->next = q;
804 p = q;
805 }
806 }
807 #endif
808 cur = cur->next;
809 }
810 return(ret);
811 }
812
813 /**
814 * xsltCopyNamespace:
815 * @ctxt: a transformation context
816 * @elem: the target element node
817 * @ns: the namespace node
818 *
819 * Copies a namespace node (declaration). If @elem is not NULL,
820 * then the new namespace will be declared on @elem.
821 *
822 * Returns: a new xmlNsPtr, or NULL in case of an error.
823 */
824 xmlNsPtr
825 xsltCopyNamespace(xsltTransformContextPtr ctxt ATTRIBUTE_UNUSED,
826 xmlNodePtr elem, xmlNsPtr ns)
827 {
828 if ((ns == NULL) || (ns->type != XML_NAMESPACE_DECL))
829 return(NULL);
830 /*
831 * One can add namespaces only on element nodes
832 */
833 if ((elem != NULL) && (elem->type != XML_ELEMENT_NODE))
834 return(xmlNewNs(NULL, ns->href, ns->prefix));
835 else
836 return(xmlNewNs(elem, ns->href, ns->prefix));
837 }
838
839
840 /**
841 * xsltFreeNamespaceAliasHashes:
842 * @style: an XSLT stylesheet
843 *
844 * Free up the memory used by namespaces aliases
845 */
846 void
847 xsltFreeNamespaceAliasHashes(xsltStylesheetPtr style) {
848 if (style->nsAliases != NULL)
849 xmlHashFree((xmlHashTablePtr) style->nsAliases, NULL);
850 style->nsAliases = NULL;
851 }