src/dialogs/rdf.cpp

   1 /**
   2  * \brief  RDF manipulation functions
   3  *
   4  * FIXME: move these to xml/ instead of dialogs/
   5  *
   6  * Authors:
   7  *   Kees Cook <kees@outflux.net>
   8  *   Jon Phillips <jon@rejon.org>
   9  *
  10  * Copyright (C) 2004 Kees Cook <kees@outflux.net>
  11  * Copyright (C) 2006 Jon Phillips <jon@rejon.org>
  12  *
  13  * Released under GNU GPL, read the file 'COPYING' for more information
  14  *
  15  */
  16
  17 #ifdef HAVE_CONFIG_H
  18 # include <config.h>
  19 #endif
  20
  21
  22
  23 #include "xml/repr.h"
  24 #include "rdf.h"
  25 #include "sp-item-group.h"
  26 #include "inkscape.h"
  27
  28 /*
  29
  30    Example RDF XML from various places...
  31
  32 <rdf:RDF xmlns="http://creativecommons.org/ns#"
  33     xmlns:dc="http://purl.org/dc/elements/1.1/"
  34     xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
  35 <Work rdf:about="">
  36    <dc:title>title of work</dc:title>
  37    <dc:date>year</dc:date>
  38    <dc:description>description of work</dc:description>
  39    <dc:creator><Agent>
  40       <dc:title>creator</dc:title>
  41    </Agent></dc:creator>
  42    <dc:rights><Agent>
  43       <dc:title>holder</dc:title>
  44    </Agent></dc:rights>
  45    <dc:type rdf:resource="http://purl.org/dc/dcmitype/StillImage" />
  46    <dc:source rdf:resource="source"/>
  47    <license rdf:resource="http://creativecommons.org/licenses/by/2.0/"
  48 />
  49 </Work>
  50
  51
  52   <rdf:RDF xmlns="http://creativecommons.org/ns#"
  53       xmlns:dc="http://purl.org/dc/elements/1.1/"
  54       xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
  55   <Work rdf:about="">
  56      <dc:title>SVG Road Signs</dc:title>
  57      <dc:rights><Agent>
  58         <dc:title>John Cliff</dc:title>
  59      </Agent></dc:rights>
  60      <dc:type rdf:resource="http://purl.org/dc/dcmitype/StillImage" />
  61      <license rdf:resource="http://creativecommons.org/ns#PublicDomain" />
  62   </Work>
  63
  64   <License rdf:about="http://creativecommons.org/ns#PublicDomain">
  65      <permits rdf:resource="http://creativecommons.org/ns#Reproduction" />
  66      <permits rdf:resource="http://creativecommons.org/ns#Distribution" />
  67      <permits rdf:resource="http://creativecommons.org/ns#DerivativeWorks" />
  68   </License>
  69
  70 </rdf:RDF>
  71
  72
  73 Bag example:
  74
  75 <dc:subject>
  76 <rdf:Bag>
  77 <rdf:li>open clip art logo</rdf:li>
  78 <rdf:li>images</rdf:li>
  79 <rdf:li>logo</rdf:li>
  80 <rdf:li>clip art</rdf:li>
  81 <rdf:li>ocal</rdf:li>
  82 <rdf:li>logotype</rdf:li>
  83 <rdf:li>filetype</rdf:li>
  84 </rdf:Bag>
  85 </dc:subject>
  86
  87
  88 */
  89
  90 struct rdf_double_t rdf_license_empty [] = {
  91     { NULL, NULL }
  92 };
  93
  94 struct rdf_double_t rdf_license_cc_a [] = {
  95     { "cc:permits", "http://creativecommons.org/ns#Reproduction", },
  96     { "cc:permits", "http://creativecommons.org/ns#Distribution", },
  97     { "cc:requires", "http://creativecommons.org/ns#Notice", },
  98     { "cc:requires", "http://creativecommons.org/ns#Attribution", },
  99     { "cc:permits", "http://creativecommons.org/ns#DerivativeWorks", },
 100     { NULL, NULL }
 101 };
 102
 103 struct rdf_double_t rdf_license_cc_a_sa [] = {
 104     { "cc:permits", "http://creativecommons.org/ns#Reproduction", },
 105     { "cc:permits", "http://creativecommons.org/ns#Distribution", },
 106     { "cc:requires", "http://creativecommons.org/ns#Notice", },
 107     { "cc:requires", "http://creativecommons.org/ns#Attribution", },
 108     { "cc:permits", "http://creativecommons.org/ns#DerivativeWorks", },
 109     { "cc:requires", "http://creativecommons.org/ns#ShareAlike", },
 110     { NULL, NULL }
 111 };
 112
 113 struct rdf_double_t rdf_license_cc_a_nd [] = {
 114     { "cc:permits", "http://creativecommons.org/ns#Reproduction", },
 115     { "cc:permits", "http://creativecommons.org/ns#Distribution", },
 116     { "cc:requires", "http://creativecommons.org/ns#Notice", },
 117     { "cc:requires", "http://creativecommons.org/ns#Attribution", },
 118     { NULL, NULL }
 119 };
 120
 121 struct rdf_double_t rdf_license_cc_a_nc [] = {
 122     { "cc:permits", "http://creativecommons.org/ns#Reproduction", },
 123     { "cc:permits", "http://creativecommons.org/ns#Distribution", },
 124     { "cc:requires", "http://creativecommons.org/ns#Notice", },
 125     { "cc:requires", "http://creativecommons.org/ns#Attribution", },
 126     { "cc:prohibits", "http://creativecommons.org/ns#CommercialUse", },
 127     { "cc:permits", "http://creativecommons.org/ns#DerivativeWorks", },
 128     { NULL, NULL }
 129 };
 130
 131 struct rdf_double_t rdf_license_cc_a_nc_sa [] = {
 132     { "cc:permits", "http://creativecommons.org/ns#Reproduction", },
 133     { "cc:permits", "http://creativecommons.org/ns#Distribution", },
 134     { "cc:requires", "http://creativecommons.org/ns#Notice", },
 135     { "cc:requires", "http://creativecommons.org/ns#Attribution", },
 136     { "cc:prohibits", "http://creativecommons.org/ns#CommercialUse", },
 137     { "cc:permits", "http://creativecommons.org/ns#DerivativeWorks", },
 138     { "cc:requires", "http://creativecommons.org/ns#ShareAlike", },
 139     { NULL, NULL }
 140 };
 141
 142 struct rdf_double_t rdf_license_cc_a_nc_nd [] = {
 143     { "cc:permits", "http://creativecommons.org/ns#Reproduction", },
 144     { "cc:permits", "http://creativecommons.org/ns#Distribution", },
 145     { "cc:requires", "http://creativecommons.org/ns#Notice", },
 146     { "cc:requires", "http://creativecommons.org/ns#Attribution", },
 147     { "cc:prohibits", "http://creativecommons.org/ns#CommercialUse", },
 148     { NULL, NULL }
 149 };
 150
 151 struct rdf_double_t rdf_license_pd [] = {
 152     { "cc:permits", "http://creativecommons.org/ns#Reproduction", },
 153     { "cc:permits", "http://creativecommons.org/ns#Distribution", },
 154     { "cc:permits", "http://creativecommons.org/ns#DerivativeWorks", },
 155     { NULL, NULL }
 156 };
 157
 158 struct rdf_double_t rdf_license_freeart [] = {
 159     { "cc:permits", "http://creativecommons.org/ns#Reproduction", },
 160     { "cc:permits", "http://creativecommons.org/ns#Distribution", },
 161     { "cc:permits", "http://creativecommons.org/ns#DerivativeWorks", },
 162     { "cc:requires", "http://creativecommons.org/ns#ShareAlike", },
 163     { "cc:requires", "http://creativecommons.org/ns#Notice", },
 164     { "cc:requires", "http://creativecommons.org/ns#Attribution", },
 165     { NULL, NULL }
 166 };
 167
 168 struct rdf_double_t rdf_license_ofl [] = {
 169     { "cc:permits", "http://scripts.sil.org/pub/OFL/Reproduction", },
 170     { "cc:permits", "http://scripts.sil.org/pub/OFL/Distribution", },
 171     { "cc:permits", "http://scripts.sil.org/pub/OFL/Embedding", },
 172     { "cc:permits", "http://scripts.sil.org/pub/OFL/DerivativeWorks", },
 173     { "cc:requires", "http://scripts.sil.org/pub/OFL/Notice", },
 174     { "cc:requires", "http://scripts.sil.org/pub/OFL/Attribution", },
 175     { "cc:requires", "http://scripts.sil.org/pub/OFL/ShareAlike", },
 176     { "cc:requires", "http://scripts.sil.org/pub/OFL/DerivativeRenaming", },
 177     { "cc:requires", "http://scripts.sil.org/pub/OFL/BundlingWhenSelling", },
 178     { NULL, NULL }
 179 };
 180
 181 struct rdf_license_t rdf_licenses [] = {
 182     { N_("CC Attribution"),
 183       "http://creativecommons.org/licenses/by/3.0/",
 184       rdf_license_cc_a,
 185     },
 186
 187     { N_("CC Attribution-ShareAlike"),
 188       "http://creativecommons.org/licenses/by-sa/3.0/",
 189       rdf_license_cc_a_sa,
 190     },
 191
 192     { N_("CC Attribution-NoDerivs"),
 193       "http://creativecommons.org/licenses/by-nd/3.0/",
 194       rdf_license_cc_a_nd,
 195     },
 196
 197     { N_("CC Attribution-NonCommercial"),
 198       "http://creativecommons.org/licenses/by-nc/3.0/",
 199       rdf_license_cc_a_nc,
 200     },
 201
 202     { N_("CC Attribution-NonCommercial-ShareAlike"),
 203       "http://creativecommons.org/licenses/by-nc-sa/3.0/",
 204       rdf_license_cc_a_nc_sa,
 205     },
 206
 207     { N_("CC Attribution-NonCommercial-NoDerivs"),
 208       "http://creativecommons.org/licenses/by-nc-nd/3.0/",
 209       rdf_license_cc_a_nc_nd,
 210     },
 211
 212     { N_("Public Domain"),
 213       "http://creativecommons.org/licenses/publicdomain/",
 214       rdf_license_pd,
 215     },
 216
 217     { N_("FreeArt"),
 218       "http://artlibre.org/licence.php/lalgb.html",
 219       rdf_license_freeart,
 220     },
 221
 222     { N_("Open Font License"),
 223       "http://scripts.sil.org/OFL",
 224       rdf_license_ofl,
 225     },
 226
 227     { NULL, NULL, rdf_license_empty, }
 228 };
 229
 230 #define XML_TAG_NAME_SVG      "svg:svg"
 231 #define XML_TAG_NAME_METADATA "svg:metadata"
 232 #define XML_TAG_NAME_RDF      "rdf:RDF"
 233 #define XML_TAG_NAME_WORK     "cc:Work"
 234 #define XML_TAG_NAME_LICENSE  "cc:License"
 235
 236 // Remember when using the "title" and "tip" elements to pass them through
 237 // the localization functions when you use them!
 238 struct rdf_work_entity_t rdf_work_entities [] = {
 239     { "title", N_("Title"), "dc:title", RDF_CONTENT,
 240       N_("Name by which this document is formally known."), RDF_FORMAT_LINE, RDF_EDIT_GENERIC,
 241     },
 242     { "date", N_("Date"), "dc:date", RDF_CONTENT,
 243       N_("Date associated with the creation of this document (YYYY-MM-DD)."), RDF_FORMAT_LINE, RDF_EDIT_GENERIC,
 244     },
 245     { "format", N_("Format"), "dc:format", RDF_CONTENT,
 246       N_("The physical or digital manifestation of this document (MIME type)."), RDF_FORMAT_LINE, RDF_EDIT_HARDCODED,
 247     },
 248     { "type", N_("Type"), "dc:type", RDF_RESOURCE,
 249       N_("Type of document (DCMI Type)."), RDF_FORMAT_LINE, RDF_EDIT_HARDCODED,
 250     },
 251
 252     { "creator", N_("Creator"), "dc:creator", RDF_AGENT,
 253       N_("Name of entity primarily responsible for making the content of this document."), RDF_FORMAT_LINE, RDF_EDIT_GENERIC,
 254     },
 255     { "rights", N_("Rights"), "dc:rights", RDF_AGENT,
 256       N_("Name of entity with rights to the Intellectual Property of this document."), RDF_FORMAT_LINE, RDF_EDIT_GENERIC,
 257     },
 258     { "publisher", N_("Publisher"), "dc:publisher", RDF_AGENT,
 259       N_("Name of entity responsible for making this document available."), RDF_FORMAT_LINE, RDF_EDIT_GENERIC,
 260     },
 261
 262     { "identifier", N_("Identifier"), "dc:identifier", RDF_CONTENT,
 263       N_("Unique URI to reference this document."), RDF_FORMAT_LINE, RDF_EDIT_GENERIC,
 264     },
 265     { "source", N_("Source"), "dc:source", RDF_CONTENT,
 266       N_("Unique URI to reference the source of this document."), RDF_FORMAT_LINE, RDF_EDIT_GENERIC,
 267     },
 268     { "relation", N_("Relation"), "dc:relation", RDF_CONTENT,
 269       N_("Unique URI to a related document."), RDF_FORMAT_LINE, RDF_EDIT_GENERIC,
 270     },
 271     { "language", N_("Language"), "dc:language", RDF_CONTENT,
 272       N_("Two-letter language tag with optional subtags for the language of this document.  (e.g. 'en-GB')"), RDF_FORMAT_LINE, RDF_EDIT_GENERIC,
 273     },
 274     { "subject", N_("Keywords"), "dc:subject", RDF_BAG,
 275       N_("The topic of this document as comma-separated key words, phrases, or classifications."), RDF_FORMAT_LINE, RDF_EDIT_GENERIC,
 276     },
 277     // TRANSLATORS: "Coverage": the spatial or temporal characteristics of the content.
 278     // For info, see Appendix D of http://www.w3.org/TR/1998/WD-rdf-schema-19980409/
 279     { "coverage", N_("Coverage"), "dc:coverage", RDF_CONTENT,
 280       N_("Extent or scope of this document."), RDF_FORMAT_LINE, RDF_EDIT_GENERIC,
 281     },
 282
 283     { "description", N_("Description"), "dc:description", RDF_CONTENT,
 284       N_("A short account of the content of this document."), RDF_FORMAT_MULTILINE, RDF_EDIT_GENERIC,
 285     },
 286
 287     // FIXME: need to handle 1 agent per line of input
 288     { "contributor", N_("Contributors"), "dc:contributor", RDF_AGENT,
 289       N_("Names of entities responsible for making contributions to the content of this document."), RDF_FORMAT_MULTILINE, RDF_EDIT_GENERIC,
 290     },
 291
 292     // TRANSLATORS: URL to a page that defines the license for the document
 293     { "license_uri", N_("URI"), "cc:license", RDF_RESOURCE,
 294       // TRANSLATORS: this is where you put a URL to a page that defines the license
 295       N_("URI to this document's license's namespace definition."), RDF_FORMAT_LINE, RDF_EDIT_SPECIAL,
 296     },
 297
 298       // TRANSLATORS: fragment of XML representing the license of the document
 299     { "license_fragment", N_("Fragment"), "License", RDF_XML,
 300       N_("XML fragment for the RDF 'License' section."), RDF_FORMAT_MULTILINE, RDF_EDIT_SPECIAL,
 301     },
 302
 303     { NULL, NULL, NULL, RDF_CONTENT,
 304       NULL, RDF_FORMAT_LINE, RDF_EDIT_HARDCODED,
 305     }
 306 };
 307
 308 /**
 309  *  \brief   Retrieves a known RDF/Work entity by name
 310  *  \return  A pointer to an RDF/Work entity
 311  *  \param   name  The desired RDF/Work entity
 312  *
 313  */
 314 struct rdf_work_entity_t *
 315 rdf_find_entity(gchar const * name)
 316 {
 317     struct rdf_work_entity_t *entity;
 318     for (entity=rdf_work_entities; entity->name; entity++) {
 319         if (strcmp(entity->name,name)==0) break;
 320     }
 321     if (entity->name) return entity;
 322     return NULL;
 323 }
 324
 325 /*
 326  * Takes the inkscape rdf struct and spits out a static RDF, which is only
 327  * useful for testing.  We must merge the rdf struct into the XML DOM for
 328  * changes to be saved.
 329  */
 330 /*
 331
 332    Since g_markup_printf_escaped doesn't exist for most people's glib
 333    right now, this function will remain commented out since it's only
 334    for generic debug anyway.  --Kees
 335
 336 gchar *
 337 rdf_string(struct rdf_t * rdf)
 338 {
 339     gulong overall=0;
 340     gchar *string=NULL;
 341
 342     gchar *rdf_head="\
 343 <rdf:RDF xmlns=\"http://creativecommons.org/ns#\"\
 344     xmlns:dc=\"http://purl.org/dc/elements/1.1/\"\
 345     xmlns:rdf=\"http://www.w3.org/1999/02/22-rdf-syntax-ns#\">\
 346 ";
 347     gchar *work_head="\
 348 <Work rdf:about=\"\">\
 349    <dc:type rdf:resource=\"http://purl.org/dc/dcmitype/StillImage\" />\
 350 ";
 351     gchar *work_title=NULL;
 352     gchar *work_date=NULL;
 353     gchar *work_description=NULL;
 354     gchar *work_creator=NULL;
 355     gchar *work_owner=NULL;
 356     gchar *work_source=NULL;
 357     gchar *work_license=NULL;
 358     gchar *license_head=NULL;
 359     gchar *license=NULL;
 360     gchar *license_end="</License>\n";
 361     gchar *work_end="</Work>\n";
 362     gchar *rdf_end="</rdf:RDF>\n";
 363
 364     if (rdf && rdf->work_title && rdf->work_title[0]) {
 365         work_title=g_markup_printf_escaped("   <dc:title>%s</dc:title>\n",
 366             rdf->work_title);
 367     overall+=strlen(work_title);
 368     }
 369     if (rdf && rdf->work_date && rdf->work_date[0]) {
 370         work_date=g_markup_printf_escaped("   <dc:date>%s</dc:date>\n",
 371             rdf->work_date);
 372     overall+=strlen(work_date);
 373     }
 374     if (rdf && rdf->work_description && rdf->work_description[0]) {
 375         work_description=g_markup_printf_escaped("   <dc:description>%s</dc:description>\n",
 376             rdf->work_description);
 377     overall+=strlen(work_description);
 378     }
 379     if (rdf && rdf->work_creator && rdf->work_creator[0]) {
 380         work_creator=g_markup_printf_escaped("   <dc:creator><Agent>\
 381       <dc:title>%s</dc:title>\
 382    </Agent></dc:creator>\n",
 383             rdf->work_creator);
 384     overall+=strlen(work_creator);
 385     }
 386     if (rdf && rdf->work_owner && rdf->work_owner[0]) {
 387         work_owner=g_markup_printf_escaped("   <dc:rights><Agent>\
 388       <dc:title>%s</dc:title>\
 389    </Agent></dc:rights>\n",
 390             rdf->work_owner);
 391     overall+=strlen(work_owner);
 392     }
 393     if (rdf && rdf->work_source && rdf->work_source[0]) {
 394         work_source=g_markup_printf_escaped("   <dc:source rdf:resource=\"%s\" />\n",
 395             rdf->work_source);
 396     overall+=strlen(work_source);
 397     }
 398     if (rdf && rdf->license && rdf->license->work_rdf && rdf->license->work_rdf[0]) {
 399         work_license=g_markup_printf_escaped("   <license rdf:resource=\"%s\" />\n",
 400             rdf->license->work_rdf);
 401     overall+=strlen(work_license);
 402
 403     license_head=g_markup_printf_escaped("<License rdf:about=\"%s\">\n",
 404             rdf->license->work_rdf);
 405     overall+=strlen(license_head);
 406     overall+=strlen(rdf->license->license_rdf);
 407     overall+=strlen(license_end);
 408     }
 409
 410     overall+=strlen(rdf_head)+strlen(rdf_end);
 411     overall+=strlen(work_head)+strlen(work_end);
 412
 413     overall++; // NULL term
 414
 415     if (!(string=(gchar*)g_malloc(overall))) {
 416         return NULL;
 417     }
 418
 419     string[0]='\0';
 420     strcat(string,rdf_head);
 421     strcat(string,work_head);
 422
 423     if (work_title)       strcat(string,work_title);
 424     if (work_date)        strcat(string,work_date);
 425     if (work_description) strcat(string,work_description);
 426     if (work_creator)     strcat(string,work_creator);
 427     if (work_owner)       strcat(string,work_owner);
 428     if (work_source)      strcat(string,work_source);
 429     if (work_license)     strcat(string,work_license);
 430
 431     strcat(string,work_end);
 432     if (license_head) {
 433         strcat(string,license_head);
 434     strcat(string,rdf->license->license_rdf);
 435     strcat(string,license_end);
 436     }
 437     strcat(string,rdf_end);
 438
 439     return string;
 440 }
 441 */
 442
 443
 444 /**
 445  *  \brief   Pull the text out of an RDF entity, depends on how it's stored
 446  *  \return  A pointer to the entity's static contents as a string
 447  *  \param   repr    The XML element to extract from
 448  *  \param   entity  The desired RDF/Work entity
 449  *
 450  */
 451 const gchar *
 452 rdf_get_repr_text ( Inkscape::XML::Node * repr, struct rdf_work_entity_t * entity )
 453 {
 454     g_return_val_if_fail (repr != NULL, NULL);
 455     g_return_val_if_fail (entity != NULL, NULL);
 456     static gchar * bag = NULL;
 457     gchar * holder = NULL;
 458
 459     Inkscape::XML::Node * temp=NULL;
 460     switch (entity->datatype) {
 461         case RDF_CONTENT:
 462             temp = sp_repr_children(repr);
 463             if ( temp == NULL ) return NULL;
 464
 465             return temp->content();
 466
 467         case RDF_AGENT:
 468             temp = sp_repr_lookup_name ( repr, "cc:Agent", 1 );
 469             if ( temp == NULL ) return NULL;
 470
 471             temp = sp_repr_lookup_name ( temp, "dc:title", 1 );
 472             if ( temp == NULL ) return NULL;
 473
 474             temp = sp_repr_children(temp);
 475             if ( temp == NULL ) return NULL;
 476
 477             return temp->content();
 478
 479         case RDF_RESOURCE:
 480             return repr->attribute("rdf:resource");
 481
 482         case RDF_XML:
 483             return "xml goes here";
 484
 485         case RDF_BAG:
 486             /* clear the static string.  yucky. */
 487             if (bag) g_free(bag);
 488             bag = NULL;
 489
 490             temp = sp_repr_lookup_name ( repr, "rdf:Bag", 1 );
 491             if ( temp == NULL ) {
 492                 /* backwards compatible: read contents */
 493                 temp = sp_repr_children(repr);
 494                 if ( temp == NULL ) return NULL;
 495
 496                 return temp->content();
 497             }
 498
 499             for ( temp = sp_repr_children(temp) ;
 500                   temp ;
 501                   temp = sp_repr_next(temp) ) {
 502                 if (!strcmp(temp->name(),"rdf:li") &&
 503                     temp->firstChild()) {
 504                     const gchar * str = temp->firstChild()->content();
 505                     if (bag) {
 506                         holder = bag;
 507                         bag = g_strconcat(holder, ", ", str, NULL);
 508                         g_free(holder);
 509                     }
 510                     else {
 511                         bag = g_strdup(str);
 512                     }
 513                 }
 514             }
 515             return bag;
 516
 517         default:
 518             break;
 519     }
 520     return NULL;
 521 }
 522
 523 unsigned int
 524 rdf_set_repr_text ( Inkscape::XML::Node * repr,
 525                     struct rdf_work_entity_t * entity,
 526                     gchar const * text )
 527 {
 528     g_return_val_if_fail ( repr != NULL, 0);
 529     g_return_val_if_fail ( entity != NULL, 0);
 530     g_return_val_if_fail ( text != NULL, 0);
 531     gchar * str = NULL;
 532     gchar** strlist = NULL;
 533     int i;
 534
 535     Inkscape::XML::Node * temp=NULL;
 536     Inkscape::XML::Node * child=NULL;
 537     Inkscape::XML::Node * parent=repr;
 538
 539     Inkscape::XML::Document * xmldoc = parent->document();
 540     g_return_val_if_fail (xmldoc != NULL, FALSE);
 541
 542     // set document's title element to the RDF title
 543     if (!strcmp(entity->name, "title")) {
 544         SPDocument *doc = SP_ACTIVE_DOCUMENT;
 545         if(doc && doc->root) doc->root->setTitle(text);
 546     }
 547
 548     switch (entity->datatype) {
 549         case RDF_CONTENT:
 550             temp = sp_repr_children(parent);
 551             if ( temp == NULL ) {
 552                 temp = xmldoc->createTextNode( text );
 553                 g_return_val_if_fail (temp != NULL, FALSE);
 554
 555                 parent->appendChild(temp);
 556                 Inkscape::GC::release(temp);
 557
 558                 return TRUE;
 559             }
 560             else {
 561                 temp->setContent(text);
 562                 return TRUE;
 563             }
 564
 565         case RDF_AGENT:
 566             temp = sp_repr_lookup_name ( parent, "cc:Agent", 1 );
 567             if ( temp == NULL ) {
 568                 temp = xmldoc->createElement ( "cc:Agent" );
 569                 g_return_val_if_fail (temp != NULL, FALSE);
 570
 571                 parent->appendChild(temp);
 572                 Inkscape::GC::release(temp);
 573             }
 574             parent = temp;
 575
 576             temp = sp_repr_lookup_name ( parent, "dc:title", 1 );
 577             if ( temp == NULL ) {
 578                 temp = xmldoc->createElement ( "dc:title" );
 579                 g_return_val_if_fail (temp != NULL, FALSE);
 580
 581                 parent->appendChild(temp);
 582                 Inkscape::GC::release(temp);
 583             }
 584             parent = temp;
 585
 586             temp = sp_repr_children(parent);
 587             if ( temp == NULL ) {
 588                 temp = xmldoc->createTextNode( text );
 589                 g_return_val_if_fail (temp != NULL, FALSE);
 590
 591                 parent->appendChild(temp);
 592                 Inkscape::GC::release(temp);
 593
 594                 return TRUE;
 595             }
 596             else {
 597                 temp->setContent(text);
 598                                 return TRUE;
 599             }
 600
 601         case RDF_RESOURCE:
 602             parent->setAttribute("rdf:resource", text );
 603             return true;
 604
 605         case RDF_XML:
 606             return 1;
 607
 608         case RDF_BAG:
 609             /* find/create the rdf:Bag item */
 610             temp = sp_repr_lookup_name ( parent, "rdf:Bag", 1 );
 611             if ( temp == NULL ) {
 612                 /* backward compatibility: drop the dc:subject contents */
 613                 while ( (temp = sp_repr_children( parent )) ) {
 614                     parent->removeChild(temp);
 615                 }
 616
 617                 temp = xmldoc->createElement ( "rdf:Bag" );
 618                 g_return_val_if_fail (temp != NULL, FALSE);
 619
 620                 parent->appendChild(temp);
 621                 Inkscape::GC::release(temp);
 622             }
 623             parent = temp;
 624
 625             /* toss all the old list items */
 626             while ( (temp = sp_repr_children( parent )) ) {
 627                 parent->removeChild(temp);
 628             }
 629
 630             /* chop our list up on commas */
 631             strlist = g_strsplit( text, ",", 0);
 632
 633             for (i = 0; (str = strlist[i]); i++) {
 634                 temp = xmldoc->createElement ( "rdf:li" );
 635                 g_return_val_if_fail (temp != NULL, 0);
 636
 637                 parent->appendChild(temp);
 638                 Inkscape::GC::release(temp);
 639
 640                 child = xmldoc->createTextNode( g_strstrip(str) );
 641                 g_return_val_if_fail (child != NULL, 0);
 642
 643                 temp->appendChild(child);
 644                 Inkscape::GC::release(child);
 645             }
 646             g_strfreev( strlist );
 647
 648             return 1;
 649
 650         default:
 651             break;
 652     }
 653     return 0;
 654 }
 655
 656 Inkscape::XML::Node *
 657 rdf_get_rdf_root_repr ( SPDocument * doc, bool build )
 658 {
 659     g_return_val_if_fail (doc        != NULL, NULL);
 660     g_return_val_if_fail (doc->rroot != NULL, NULL);
 661
 662     Inkscape::XML::Document * xmldoc = sp_document_repr_doc(doc);
 663     g_return_val_if_fail (xmldoc != NULL, NULL);
 664
 665     Inkscape::XML::Node * rdf = sp_repr_lookup_name ( doc->rroot, XML_TAG_NAME_RDF );
 666
 667     if (rdf == NULL) {
 668         //printf("missing XML '%s'\n",XML_TAG_NAME_RDF);
 669         if (!build) return NULL;
 670
 671         Inkscape::XML::Node * svg = sp_repr_lookup_name ( doc->rroot, XML_TAG_NAME_SVG );
 672         g_return_val_if_fail ( svg != NULL, NULL );
 673
 674         Inkscape::XML::Node * parent = sp_repr_lookup_name ( svg, XML_TAG_NAME_METADATA );
 675         if ( parent == NULL ) {
 676             parent = xmldoc->createElement( XML_TAG_NAME_METADATA );
 677             g_return_val_if_fail ( parent != NULL, NULL);
 678
 679             svg->appendChild(parent);
 680             Inkscape::GC::release(parent);
 681         }
 682
 683         Inkscape::XML::Document * xmldoc = parent->document();
 684         g_return_val_if_fail (xmldoc != NULL, FALSE);
 685
 686         rdf = xmldoc->createElement( XML_TAG_NAME_RDF );
 687         g_return_val_if_fail (rdf != NULL, NULL);
 688
 689         parent->appendChild(rdf);
 690         Inkscape::GC::release(rdf);
 691     }
 692
 693     /*
 694      * some implementations do not put RDF stuff inside <metadata>,
 695      * so we need to check for it and add it if we don't see it
 696      */
 697     Inkscape::XML::Node * want_metadata = sp_repr_parent ( rdf );
 698     g_return_val_if_fail (want_metadata != NULL, NULL);
 699     if (strcmp( want_metadata->name(), XML_TAG_NAME_METADATA )) {
 700             Inkscape::XML::Node * metadata = xmldoc->createElement( XML_TAG_NAME_METADATA );
 701             g_return_val_if_fail (metadata != NULL, NULL);
 702
 703             /* attach the metadata node */
 704             want_metadata->appendChild(metadata);
 705             Inkscape::GC::release(metadata);
 706
 707             /* move the RDF into it */
 708             Inkscape::GC::anchor(rdf);
 709             sp_repr_unparent ( rdf );
 710             metadata->appendChild(rdf);
 711             Inkscape::GC::release(rdf);
 712     }
 713
 714     return rdf;
 715 }
 716
 717 Inkscape::XML::Node *
 718 rdf_get_xml_repr( SPDocument * doc, gchar const * name, bool build )
 719 {
 720     g_return_val_if_fail (name       != NULL, NULL);
 721     g_return_val_if_fail (doc        != NULL, NULL);
 722     g_return_val_if_fail (doc->rroot != NULL, NULL);
 723
 724     Inkscape::XML::Node * rdf = rdf_get_rdf_root_repr ( doc, build );
 725     if (!rdf) return NULL;
 726
 727     Inkscape::XML::Node * xml = sp_repr_lookup_name ( rdf, name );
 728     if (xml == NULL) {
 729         //printf("missing XML '%s'\n",name);
 730         if (!build) return NULL;
 731
 732         Inkscape::XML::Document * xmldoc = sp_document_repr_doc(doc);
 733         g_return_val_if_fail (xmldoc != NULL, NULL);
 734
 735         xml = xmldoc->createElement( name );
 736         g_return_val_if_fail (xml != NULL, NULL);
 737
 738         xml->setAttribute("rdf:about", "" );
 739
 740         rdf->appendChild(xml);
 741         Inkscape::GC::release(xml);
 742     }
 743
 744     return xml;
 745 }
 746
 747 Inkscape::XML::Node *
 748 rdf_get_work_repr( SPDocument * doc, gchar const * name, bool build )
 749 {
 750     g_return_val_if_fail (name       != NULL, NULL);
 751     g_return_val_if_fail (doc        != NULL, NULL);
 752     g_return_val_if_fail (doc->rroot != NULL, NULL);
 753
 754     Inkscape::XML::Node * work = rdf_get_xml_repr ( doc, XML_TAG_NAME_WORK, build );
 755     if (!work) return NULL;
 756
 757     Inkscape::XML::Node * item = sp_repr_lookup_name ( work, name, 1 );
 758     if (item == NULL) {
 759         //printf("missing XML '%s'\n",name);
 760         if (!build) return NULL;
 761
 762         Inkscape::XML::Document * xmldoc = sp_document_repr_doc(doc);
 763         g_return_val_if_fail (xmldoc != NULL, NULL);
 764
 765         item = xmldoc->createElement( name );
 766         g_return_val_if_fail (item != NULL, NULL);
 767
 768         work->appendChild(item);
 769         Inkscape::GC::release(item);
 770     }
 771
 772     return item;
 773 }
 774
 775
 776
 777 /**
 778  *  \brief   Retrieves a known RDF/Work entity's contents from the document XML by name
 779  *  \return  A pointer to the entity's static contents as a string, or NULL if no entity exists
 780  *  \param   entity  The desired RDF/Work entity
 781  *
 782  */
 783 const gchar *
 784 rdf_get_work_entity(SPDocument * doc, struct rdf_work_entity_t * entity)
 785 {
 786     g_return_val_if_fail (doc    != NULL, NULL);
 787     if ( entity == NULL ) return NULL;
 788     //printf("want '%s'\n",entity->title);
 789     bool bIsTitle = !strcmp(entity->name, "title");
 790
 791     Inkscape::XML::Node * item;
 792     if ( entity->datatype == RDF_XML ) {
 793         item = rdf_get_xml_repr ( doc, entity->tag, FALSE );
 794     }
 795     else {
 796         item = rdf_get_work_repr( doc, entity->tag, bIsTitle ); // build title if necessary
 797     }
 798     if ( item == NULL ) return NULL;
 799     const gchar * result = rdf_get_repr_text ( item, entity );
 800     if(!result && bIsTitle && doc->root) {         // if RDF title not set
 801         result = doc->root->title();               // get the document's <title>
 802         rdf_set_work_entity(doc, entity, result);  // and set the RDF
 803     }
 804     //printf("found '%s' == '%s'\n", entity->title, result );
 805     return result;
 806 }
 807
 808 /**
 809  *  \brief   Stores a string into a named RDF/Work entity in the document XML
 810  *  \param   entity The desired RDF/Work entity to replace
 811  *  \param   string The string to replace the entity contents with
 812  *
 813  */
 814 unsigned int
 815 rdf_set_work_entity(SPDocument * doc, struct rdf_work_entity_t * entity,
 816                     const gchar * text)
 817 {
 818     g_return_val_if_fail ( entity != NULL, 0 );
 819     if (text == NULL) {
 820         // FIXME: on a "NULL" text, delete the entity.  For now, blank it.
 821         text="";
 822     }
 823
 824     /*
 825     printf("changing '%s' (%s) to '%s'\n",
 826         entity->title,
 827         entity->tag,
 828         text);
 829     */
 830
 831     Inkscape::XML::Node * item = rdf_get_work_repr( doc, entity->tag, TRUE );
 832     g_return_val_if_fail ( item != NULL, 0 );
 833
 834     return rdf_set_repr_text ( item, entity, text );
 835 }
 836
 837 #undef DEBUG_MATCH
 838
 839 static bool
 840 rdf_match_license(Inkscape::XML::Node const *repr, struct rdf_license_t const *license)
 841 {
 842     g_assert ( repr != NULL );
 843     g_assert ( license != NULL );
 844
 845     bool result=TRUE;
 846 #ifdef DEBUG_MATCH
 847     printf("checking against '%s'\n",license->name);
 848 #endif
 849
 850     int count = 0;
 851     for (struct rdf_double_t const *details = license->details;
 852          details->name; details++ ) {
 853         count++;
 854     }
 855     bool * matched = (bool*)calloc(count,sizeof(bool));
 856
 857     for (Inkscape::XML::Node const *current = sp_repr_children(repr);
 858          current;
 859          current = sp_repr_next ( current ) ) {
 860
 861         gchar const * attr = current->attribute("rdf:resource");
 862         if ( attr == NULL ) continue;
 863
 864 #ifdef DEBUG_MATCH
 865         printf("\texamining '%s' => '%s'\n", current->name(), attr);
 866 #endif
 867
 868         bool found_match=FALSE;
 869         for (int i=0; i<count; i++) {
 870             // skip already matched items
 871             if (matched[i]) continue;
 872
 873 #ifdef DEBUG_MATCH
 874             printf("\t\t'%s' vs '%s'\n", current->name(), license->details[i].name);
 875             printf("\t\t'%s' vs '%s'\n", attr, license->details[i].resource);
 876 #endif
 877
 878             if (!strcmp( current->name(),
 879                          license->details[i].name ) &&
 880                 !strcmp( attr,
 881                          license->details[i].resource )) {
 882                 matched[i]=TRUE;
 883                 found_match=TRUE;
 884 #ifdef DEBUG_MATCH
 885                 printf("\t\tgood!\n");
 886 #endif
 887                 break;
 888             }
 889         }
 890         if (!found_match) {
 891             // if we checked each known item of the license
 892             // and didn't find it, we must abort
 893             result=FALSE;
 894 #ifdef DEBUG_MATCH
 895             printf("\t\tno '%s' element matched XML (bong)!\n",license->name);
 896 #endif
 897             break;
 898         }
 899     }
 900 #ifdef DEBUG_MATCH
 901     if (result) printf("\t\tall XML found matching elements!\n");
 902 #endif
 903     for (int i=0; result && i<count; i++) {
 904         // scan looking for an unmatched item
 905         if (matched[i]==0) {
 906             result=FALSE;
 907 #ifdef DEBUG_MATCH
 908             printf("\t\tnot all '%s' elements used to match (bong)!\n", license->name);
 909 #endif
 910         }
 911     }
 912
 913 #ifdef DEBUG_MATCH
 914     printf("\t\tall '%s' elements used to match!\n",license->name);
 915 #endif
 916
 917     free(matched);
 918
 919 #ifdef DEBUG_MATCH
 920     if (result) printf("matched '%s'\n",license->name);
 921 #endif
 922     return result;
 923 }
 924
 925 /**
 926  *  \brief   Attempts to match and retrieve a known RDF/License from the document XML
 927  *  \return  A pointer to the static RDF license structure
 928  *
 929  */
 930 struct rdf_license_t *
 931 rdf_get_license(SPDocument * document)
 932 {
 933     Inkscape::XML::Node const *repr = rdf_get_xml_repr ( document, XML_TAG_NAME_LICENSE, FALSE );
 934     if (repr) {
 935         for (struct rdf_license_t * license = rdf_licenses;
 936              license->name; license++ ) {
 937             if ( rdf_match_license ( repr, license ) ) return license;
 938         }
 939     }
 940 #ifdef DEBUG_MATCH
 941     else {
 942         printf("no license XML\n");
 943     }
 944 #endif
 945     return NULL;
 946 }
 947
 948 /**
 949  *  \brief   Stores an RDF/License XML in the document XML
 950  *  \param   document  Which document to update
 951  *  \param   license   The desired RDF/License structure to store; NULL drops old license, so can be used for proprietary license.
 952  *
 953  */
 954 void
 955 rdf_set_license(SPDocument * doc, struct rdf_license_t const * license)
 956 {
 957     // drop old license section
 958     Inkscape::XML::Node * repr = rdf_get_xml_repr ( doc, XML_TAG_NAME_LICENSE, FALSE );
 959     if (repr) sp_repr_unparent(repr);
 960
 961     if (!license) return;
 962
 963     // build new license section
 964     repr = rdf_get_xml_repr ( doc, XML_TAG_NAME_LICENSE, TRUE );
 965     g_assert ( repr );
 966
 967     repr->setAttribute("rdf:about", license->uri );
 968
 969     Inkscape::XML::Document * xmldoc = sp_document_repr_doc(doc);
 970     g_return_if_fail (xmldoc != NULL);
 971
 972     for (struct rdf_double_t const * detail = license->details;
 973          detail->name; detail++) {
 974         Inkscape::XML::Node * child = xmldoc->createElement( detail->name );
 975         g_assert ( child != NULL );
 976
 977         child->setAttribute("rdf:resource", detail->resource );
 978         repr->appendChild(child);
 979         Inkscape::GC::release(child);
 980     }
 981 }
 982
 983 struct rdf_entity_default_t {
 984     gchar const * name;
 985     gchar const * text;
 986 };
 987 struct rdf_entity_default_t rdf_defaults[] = {
 988     { "format",      "image/svg+xml", },
 989     { "type",        "http://purl.org/dc/dcmitype/StillImage", },
 990     { NULL,          NULL, }
 991 };
 992
 993 void
 994 rdf_set_defaults ( SPDocument * doc )
 995 {
 996     g_assert ( doc != NULL );
 997
 998     // Create metadata node if it doesn't already exist
 999     if (!sp_item_group_get_child_by_name ((SPGroup *) doc->root, NULL,
1000                                           XML_TAG_NAME_METADATA)) {
1001         // create repr
1002         Inkscape::XML::Document * xmldoc = sp_document_repr_doc(doc);
1003         g_return_if_fail (xmldoc != NULL);
1004         Inkscape::XML::Node * rnew = xmldoc->createElement (XML_TAG_NAME_METADATA);
1005         // insert into the document
1006         doc->rroot->addChild(rnew, NULL);
1007         // clean up
1008         Inkscape::GC::release(rnew);
1009     }
1010
1011     /* install defaults */
1012     for ( struct rdf_entity_default_t * rdf_default = rdf_defaults;
1013           rdf_default->name;
1014           rdf_default++) {
1015         struct rdf_work_entity_t * entity = rdf_find_entity ( rdf_default->name );
1016         g_assert ( entity != NULL );
1017
1018         if ( rdf_get_work_entity ( doc, entity ) == NULL ) {
1019             rdf_set_work_entity ( doc, entity, rdf_default->text );
1020         }
1021     }
1022 }
1023
1024
1025 /*
1026   Local Variables:
1027   mode:c++
1028   c-file-style:"stroustrup"
1029   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
1030   indent-tabs-mode:nil
1031   fill-column:99
1032   End:
1033 */
1034 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :