dll/3rdparty/libxslt/namespaces.c

   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 }