dll/3rdparty/libxslt/imports.c

   1 /*
   2  * imports.c: Implementation of the XSLT imports
   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
  36 #include <libxml/xmlmemory.h>
  37 #include <libxml/tree.h>
  38 #include <libxml/hash.h>
  39 #include <libxml/xmlerror.h>
  40 #include <libxml/uri.h>
  41 #include "xslt.h"
  42 #include "xsltInternals.h"
  43 #include "xsltutils.h"
  44 #include "preproc.h"
  45 #include "imports.h"
  46 #include "documents.h"
  47 #include "security.h"
  48 #include "pattern.h"
  49
  50
  51 /************************************************************************
  52  *                                                                      *
  53  *                      Module interfaces                               *
  54  *                                                                      *
  55  ************************************************************************/
  56 /**
  57  * xsltFixImportedCompSteps:
  58  * @master: the "master" stylesheet
  59  * @style: the stylesheet being imported by the master
  60  *
  61  * normalize the comp steps for the stylesheet being imported
  62  * by the master, together with any imports within that.
  63  *
  64  */
  65 static void xsltFixImportedCompSteps(xsltStylesheetPtr master,
  66                         xsltStylesheetPtr style) {
  67     xsltStylesheetPtr res;
  68     xmlHashScan(style->templatesHash,
  69                     (xmlHashScanner) xsltNormalizeCompSteps, master);
  70     master->extrasNr += style->extrasNr;
  71     for (res = style->imports; res != NULL; res = res->next) {
  72         xsltFixImportedCompSteps(master, res);
  73     }
  74 }
  75
  76 /**
  77  * xsltParseStylesheetImport:
  78  * @style:  the XSLT stylesheet
  79  * @cur:  the import element
  80  *
  81  * parse an XSLT stylesheet import element
  82  *
  83  * Returns 0 in case of success -1 in case of failure.
  84  */
  85
  86 int
  87 xsltParseStylesheetImport(xsltStylesheetPtr style, xmlNodePtr cur) {
  88     int ret = -1;
  89     xmlDocPtr import = NULL;
  90     xmlChar *base = NULL;
  91     xmlChar *uriRef = NULL;
  92     xmlChar *URI = NULL;
  93     xsltStylesheetPtr res;
  94     xsltSecurityPrefsPtr sec;
  95
  96     if ((cur == NULL) || (style == NULL))
  97         return (ret);
  98
  99     uriRef = xmlGetNsProp(cur, (const xmlChar *)"href", NULL);
 100     if (uriRef == NULL) {
 101         xsltTransformError(NULL, style, cur,
 102             "xsl:import : missing href attribute\n");
 103         goto error;
 104     }
 105
 106     base = xmlNodeGetBase(style->doc, cur);
 107     URI = xmlBuildURI(uriRef, base);
 108     if (URI == NULL) {
 109         xsltTransformError(NULL, style, cur,
 110             "xsl:import : invalid URI reference %s\n", uriRef);
 111         goto error;
 112     }
 113
 114     res = style;
 115     while (res != NULL) {
 116         if (res->doc == NULL)
 117             break;
 118         if (xmlStrEqual(res->doc->URL, URI)) {
 119             xsltTransformError(NULL, style, cur,
 120                "xsl:import : recursion detected on imported URL %s\n", URI);
 121             goto error;
 122         }
 123         res = res->parent;
 124     }
 125
 126     /*
 127      * Security framework check
 128      */
 129     sec = xsltGetDefaultSecurityPrefs();
 130     if (sec != NULL) {
 131         int secres;
 132
 133         secres = xsltCheckRead(sec, NULL, URI);
 134         if (secres == 0) {
 135             xsltTransformError(NULL, NULL, NULL,
 136                  "xsl:import: read rights for %s denied\n",
 137                              URI);
 138             goto error;
 139         }
 140     }
 141
 142     import = xsltDocDefaultLoader(URI, style->dict, XSLT_PARSE_OPTIONS,
 143                                   (void *) style, XSLT_LOAD_STYLESHEET);
 144     if (import == NULL) {
 145         xsltTransformError(NULL, style, cur,
 146             "xsl:import : unable to load %s\n", URI);
 147         goto error;
 148     }
 149
 150     res = xsltParseStylesheetImportedDoc(import, style);
 151     if (res != NULL) {
 152         res->next = style->imports;
 153         style->imports = res;
 154         if (style->parent == NULL) {
 155             xsltFixImportedCompSteps(style, res);
 156         }
 157         ret = 0;
 158     } else {
 159         xmlFreeDoc(import);
 160         }
 161
 162 error:
 163     if (uriRef != NULL)
 164         xmlFree(uriRef);
 165     if (base != NULL)
 166         xmlFree(base);
 167     if (URI != NULL)
 168         xmlFree(URI);
 169
 170     return (ret);
 171 }
 172
 173 /**
 174  * xsltParseStylesheetInclude:
 175  * @style:  the XSLT stylesheet
 176  * @cur:  the include node
 177  *
 178  * parse an XSLT stylesheet include element
 179  *
 180  * Returns 0 in case of success -1 in case of failure
 181  */
 182
 183 int
 184 xsltParseStylesheetInclude(xsltStylesheetPtr style, xmlNodePtr cur) {
 185     int ret = -1;
 186     xmlDocPtr oldDoc;
 187     xmlChar *base = NULL;
 188     xmlChar *uriRef = NULL;
 189     xmlChar *URI = NULL;
 190     xsltStylesheetPtr result;
 191     xsltDocumentPtr include;
 192     xsltDocumentPtr docptr;
 193     int oldNopreproc;
 194
 195     if ((cur == NULL) || (style == NULL))
 196         return (ret);
 197
 198     uriRef = xmlGetNsProp(cur, (const xmlChar *)"href", NULL);
 199     if (uriRef == NULL) {
 200         xsltTransformError(NULL, style, cur,
 201             "xsl:include : missing href attribute\n");
 202         goto error;
 203     }
 204
 205     base = xmlNodeGetBase(style->doc, cur);
 206     URI = xmlBuildURI(uriRef, base);
 207     if (URI == NULL) {
 208         xsltTransformError(NULL, style, cur,
 209             "xsl:include : invalid URI reference %s\n", uriRef);
 210         goto error;
 211     }
 212
 213     /*
 214      * in order to detect recursion, we check all previously included
 215      * stylesheets.
 216      */
 217     docptr = style->includes;
 218     while (docptr != NULL) {
 219         if (xmlStrEqual(docptr->doc->URL, URI)) {
 220             xsltTransformError(NULL, style, cur,
 221                 "xsl:include : recursion detected on included URL %s\n", URI);
 222             goto error;
 223         }
 224         docptr = docptr->includes;
 225     }
 226
 227     include = xsltLoadStyleDocument(style, URI);
 228     if (include == NULL) {
 229         xsltTransformError(NULL, style, cur,
 230             "xsl:include : unable to load %s\n", URI);
 231         goto error;
 232     }
 233 #ifdef XSLT_REFACTORED
 234     if (IS_XSLT_ELEM_FAST(cur) && (cur->psvi != NULL)) {
 235         ((xsltStyleItemIncludePtr) cur->psvi)->include = include;
 236     } else {
 237         xsltTransformError(NULL, style, cur,
 238             "Internal error: (xsltParseStylesheetInclude) "
 239             "The xsl:include element was not compiled.\n", URI);
 240         style->errors++;
 241     }
 242 #endif
 243     oldDoc = style->doc;
 244     style->doc = include->doc;
 245     /* chain to stylesheet for recursion checking */
 246     include->includes = style->includes;
 247     style->includes = include;
 248     oldNopreproc = style->nopreproc;
 249     style->nopreproc = include->preproc;
 250     /*
 251     * TODO: This will change some values of the
 252     *  including stylesheet with every included module
 253     *  (e.g. excluded-result-prefixes)
 254     *  We need to strictly seperate such stylesheet-owned values.
 255     */
 256     result = xsltParseStylesheetProcess(style, include->doc);
 257     style->nopreproc = oldNopreproc;
 258     include->preproc = 1;
 259     style->includes = include->includes;
 260     style->doc = oldDoc;
 261     if (result == NULL) {
 262         ret = -1;
 263         goto error;
 264     }
 265     ret = 0;
 266
 267 error:
 268     if (uriRef != NULL)
 269         xmlFree(uriRef);
 270     if (base != NULL)
 271         xmlFree(base);
 272     if (URI != NULL)
 273         xmlFree(URI);
 274
 275     return (ret);
 276 }
 277
 278 /**
 279  * xsltNextImport:
 280  * @cur:  the current XSLT stylesheet
 281  *
 282  * Find the next stylesheet in import precedence.
 283  *
 284  * Returns the next stylesheet or NULL if it was the last one
 285  */
 286
 287 xsltStylesheetPtr
 288 xsltNextImport(xsltStylesheetPtr cur) {
 289     if (cur == NULL)
 290         return(NULL);
 291     if (cur->imports != NULL)
 292         return(cur->imports);
 293     if (cur->next != NULL)
 294         return(cur->next) ;
 295     do {
 296         cur = cur->parent;
 297         if (cur == NULL) break;
 298         if (cur->next != NULL) return(cur->next);
 299     } while (cur != NULL);
 300     return(cur);
 301 }
 302
 303 /**
 304  * xsltNeedElemSpaceHandling:
 305  * @ctxt:  an XSLT transformation context
 306  *
 307  * Checks whether that stylesheet requires white-space stripping
 308  *
 309  * Returns 1 if space should be stripped, 0 if not
 310  */
 311
 312 int
 313 xsltNeedElemSpaceHandling(xsltTransformContextPtr ctxt) {
 314     xsltStylesheetPtr style;
 315
 316     if (ctxt == NULL)
 317         return(0);
 318     style = ctxt->style;
 319     while (style != NULL) {
 320         if (style->stripSpaces != NULL)
 321             return(1);
 322         style = xsltNextImport(style);
 323     }
 324     return(0);
 325 }
 326
 327 /**
 328  * xsltFindElemSpaceHandling:
 329  * @ctxt:  an XSLT transformation context
 330  * @node:  an XML node
 331  *
 332  * Find strip-space or preserve-space informations for an element
 333  * respect the import precedence or the wildcards
 334  *
 335  * Returns 1 if space should be stripped, 0 if not, and 2 if everything
 336  *         should be CDTATA wrapped.
 337  */
 338
 339 int
 340 xsltFindElemSpaceHandling(xsltTransformContextPtr ctxt, xmlNodePtr node) {
 341     xsltStylesheetPtr style;
 342     const xmlChar *val;
 343
 344     if ((ctxt == NULL) || (node == NULL))
 345         return(0);
 346     style = ctxt->style;
 347     while (style != NULL) {
 348         if (node->ns != NULL) {
 349             val = (const xmlChar *)
 350               xmlHashLookup2(style->stripSpaces, node->name, node->ns->href);
 351             if (val == NULL) {
 352                 val = (const xmlChar *)
 353                     xmlHashLookup2(style->stripSpaces, BAD_CAST "*",
 354                                    node->ns->href);
 355             }
 356         } else {
 357             val = (const xmlChar *)
 358                   xmlHashLookup2(style->stripSpaces, node->name, NULL);
 359         }
 360         if (val != NULL) {
 361             if (xmlStrEqual(val, (xmlChar *) "strip"))
 362                 return(1);
 363             if (xmlStrEqual(val, (xmlChar *) "preserve"))
 364                 return(0);
 365         }
 366         if (style->stripAll == 1)
 367             return(1);
 368         if (style->stripAll == -1)
 369             return(0);
 370
 371         style = xsltNextImport(style);
 372     }
 373     return(0);
 374 }
 375
 376 /**
 377  * xsltFindTemplate:
 378  * @ctxt:  an XSLT transformation context
 379  * @name: the template name
 380  * @nameURI: the template name URI
 381  *
 382  * Finds the named template, apply import precedence rule.
 383  * REVISIT TODO: We'll change the nameURI fields of
 384  *  templates to be in the string dict, so if the
 385  *  specified @nameURI is in the same dict, then use pointer
 386  *  comparison. Check if this can be done in a sane way.
 387  *  Maybe this function is not needed internally at
 388  *  transformation-time if we hard-wire the called templates
 389  *  to the caller.
 390  *
 391  * Returns the xsltTemplatePtr or NULL if not found
 392  */
 393 xsltTemplatePtr
 394 xsltFindTemplate(xsltTransformContextPtr ctxt, const xmlChar *name,
 395                  const xmlChar *nameURI) {
 396     xsltTemplatePtr cur;
 397     xsltStylesheetPtr style;
 398
 399     if ((ctxt == NULL) || (name == NULL))
 400         return(NULL);
 401     style = ctxt->style;
 402     while (style != NULL) {
 403         cur = style->templates;
 404         while (cur != NULL) {
 405             if (xmlStrEqual(name, cur->name)) {
 406                 if (((nameURI == NULL) && (cur->nameURI == NULL)) ||
 407                     ((nameURI != NULL) && (cur->nameURI != NULL) &&
 408                      (xmlStrEqual(nameURI, cur->nameURI)))) {
 409                     return(cur);
 410                 }
 411             }
 412             cur = cur->next;
 413         }
 414
 415         style = xsltNextImport(style);
 416     }
 417     return(NULL);
 418 }
 419