recctrl/xslt.c

   1 /* $Id: xslt.c,v 1.21 2006-05-10 08:13:31 adam Exp $
   2    Copyright (C) 1995-2005
   3    Index Data ApS
   4
   5 This file is part of the Zebra server.
   6
   7 Zebra is free software; you can redistribute it and/or modify it under
   8 the terms of the GNU General Public License as published by the Free
   9 Software Foundation; either version 2, or (at your option) any later
  10 version.
  11
  12 Zebra is distributed in the hope that it will be useful, but WITHOUT ANY
  13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15 for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with Zebra; see the file LICENSE.zebra.  If not, write to the
  19 Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA
  20 02111-1307, USA.
  21 */
  22
  23 #include <stdio.h>
  24 #include <assert.h>
  25 #include <ctype.h>
  26
  27 #include <yaz/diagbib1.h>
  28 #include <yaz/tpath.h>
  29
  30 #include <libxml/xmlversion.h>
  31 #include <libxml/parser.h>
  32 #include <libxml/tree.h>
  33 #include <libxml/xmlIO.h>
  34 #include <libxml/xmlreader.h>
  35 #include <libxslt/transform.h>
  36
  37 #include <idzebra/util.h>
  38 #include <idzebra/recctrl.h>
  39
  40 struct filter_xslt_schema {
  41     const char *name;
  42     const char *identifier;
  43     const char *stylesheet;
  44     struct filter_xslt_schema *next;
  45     const char *default_schema;
  46     const char *include_snippet;
  47     xsltStylesheetPtr stylesheet_xsp;
  48 };
  49
  50 struct filter_xslt_info {
  51     xmlDocPtr doc;
  52     char *fname;
  53     char *full_name;
  54     const char *profile_path;
  55     const char *split_level;
  56     const char *split_path;
  57     ODR odr;
  58     struct filter_xslt_schema *schemas;
  59     xmlTextReaderPtr reader;
  60 };
  61
  62
  63 #define ZEBRA_SCHEMA_XSLT_NS "http://indexdata.dk/zebra/xslt/1"
  64
  65 #define XML_STRCMP(a,b)   strcmp((char*)a, b)
  66 #define XML_STRLEN(a) strlen((char*)a)
  67
  68 static const char *zebra_xslt_ns = ZEBRA_SCHEMA_XSLT_NS;
  69
  70 static void set_param_xml(const char **params, const char *name,
  71                           const char *value, ODR odr)
  72 {
  73     while (*params)
  74         params++;
  75     params[0] = name;
  76     params[1] = value;
  77     params[2] = 0;
  78 }
  79
  80 static void set_param_str(const char **params, const char *name,
  81                           const char *value, ODR odr)
  82 {
  83     char *quoted = odr_malloc(odr, 3 + strlen(value));
  84     sprintf(quoted, "'%s'", value);
  85     while (*params)
  86         params++;
  87     params[0] = name;
  88     params[1] = quoted;
  89     params[2] = 0;
  90 }
  91
  92 static void set_param_int(const char **params, const char *name,
  93                           zint value, ODR odr)
  94 {
  95     char *quoted = odr_malloc(odr, 30); /* 25 digits enough for 2^64 */
  96     while (*params)
  97         params++;
  98     sprintf(quoted, "'" ZINT_FORMAT "'", value);
  99     params[0] = name;
 100     params[1] = quoted;
 101     params[2] = 0;
 102 }
 103
 104 #define ENABLE_INPUT_CALLBACK 0
 105
 106 #if ENABLE_INPUT_CALLBACK
 107 static int zebra_xmlInputMatchCallback (char const *filename)
 108 {
 109     yaz_log(YLOG_LOG, "match %s", filename);
 110     return 0;
 111 }
 112
 113 static void * zebra_xmlInputOpenCallback (char const *filename)
 114 {
 115     return 0;
 116 }
 117
 118 static int zebra_xmlInputReadCallback (void * context, char * buffer, int len)
 119 {
 120     return 0;
 121 }
 122
 123 static int zebra_xmlInputCloseCallback (void * context)
 124 {
 125     return 0;
 126 }
 127 #endif
 128
 129 static void *filter_init(Res res, RecType recType)
 130 {
 131     struct filter_xslt_info *tinfo
 132       = (struct filter_xslt_info *) xmalloc(sizeof(*tinfo));
 133     tinfo->reader = 0;
 134     tinfo->fname = 0;
 135     tinfo->full_name = 0;
 136     tinfo->profile_path = 0;
 137     tinfo->split_level = 0;
 138     tinfo->split_path = 0;
 139     tinfo->odr = odr_createmem(ODR_ENCODE);
 140     tinfo->doc = 0;
 141     tinfo->schemas = 0;
 142
 143 #if ENABLE_INPUT_CALLBACK
 144     xmlRegisterDefaultInputCallbacks();
 145     xmlRegisterInputCallbacks(zebra_xmlInputMatchCallback,
 146                               zebra_xmlInputOpenCallback,
 147                               zebra_xmlInputReadCallback,
 148                               zebra_xmlInputCloseCallback);
 149 #endif
 150     return tinfo;
 151 }
 152
 153 static int attr_content(struct _xmlAttr *attr, const char *name,
 154                         const char **dst_content)
 155 {
 156     if (!XML_STRCMP(attr->name, name) && attr->children &&
 157         attr->children->type == XML_TEXT_NODE)
 158     {
 159         *dst_content = (const char *)(attr->children->content);
 160         return 1;
 161     }
 162     return 0;
 163 }
 164
 165 static void destroy_schemas(struct filter_xslt_info *tinfo)
 166 {
 167     struct filter_xslt_schema *schema = tinfo->schemas;
 168     while (schema)
 169     {
 170         struct filter_xslt_schema *schema_next = schema->next;
 171         if (schema->stylesheet_xsp)
 172             xsltFreeStylesheet(schema->stylesheet_xsp);
 173         xfree(schema);
 174         schema = schema_next;
 175     }
 176     tinfo->schemas = 0;
 177     xfree(tinfo->fname);
 178     if (tinfo->doc)
 179         xmlFreeDoc(tinfo->doc);
 180     tinfo->doc = 0;
 181 }
 182
 183 static ZEBRA_RES create_schemas(struct filter_xslt_info *tinfo,
 184                                 const char *fname)
 185 {
 186     char tmp_full_name[1024];
 187     xmlNodePtr ptr;
 188     tinfo->fname = xstrdup(fname);
 189
 190     if (yaz_filepath_resolve(tinfo->fname, tinfo->profile_path,
 191                              NULL, tmp_full_name))
 192       tinfo->full_name = xstrdup(tmp_full_name);
 193     else
 194       tinfo->full_name = xstrdup(tinfo->fname);
 195
 196     yaz_log(YLOG_LOG, "xslt filter: loading config file %s", tinfo->full_name);
 197
 198     tinfo->doc = xmlParseFile(tinfo->full_name);
 199     if (!tinfo->doc) {
 200       yaz_log(YLOG_WARN, "xslt filter: could not parse config file %s",
 201               tinfo->full_name);
 202       return ZEBRA_FAIL;
 203     }
 204
 205     ptr = xmlDocGetRootElement(tinfo->doc);
 206     if (!ptr || ptr->type != XML_ELEMENT_NODE ||
 207         XML_STRCMP(ptr->name, "schemaInfo")){
 208           yaz_log(YLOG_WARN,
 209                   "xslt filter:  config file %s :"
 210                   " expected root element <schemaInfo>",
 211               tinfo->full_name);
 212       return ZEBRA_FAIL;
 213     }
 214
 215     for (ptr = ptr->children; ptr; ptr = ptr->next)
 216     {
 217         if (ptr->type != XML_ELEMENT_NODE)
 218             continue;
 219         if (!XML_STRCMP(ptr->name, "schema"))
 220         {
 221             char tmp_xslt_full_name[1024];
 222             struct _xmlAttr *attr;
 223             struct filter_xslt_schema *schema = xmalloc(sizeof(*schema));
 224             schema->name = 0;
 225             schema->identifier = 0;
 226             schema->stylesheet = 0;
 227             schema->default_schema = 0;
 228             schema->next = tinfo->schemas;
 229             schema->stylesheet_xsp = 0;
 230             schema->include_snippet = 0;
 231             tinfo->schemas = schema;
 232             for (attr = ptr->properties; attr; attr = attr->next)
 233             {
 234                 attr_content(attr, "identifier", &schema->identifier);
 235                 attr_content(attr, "name", &schema->name);
 236                 attr_content(attr, "stylesheet", &schema->stylesheet);
 237                 attr_content(attr, "default", &schema->default_schema);
 238                 attr_content(attr, "snippet", &schema->include_snippet);
 239             }
 240             if (schema->stylesheet){
 241               yaz_filepath_resolve(schema->stylesheet, tinfo->profile_path,
 242                                    NULL, tmp_xslt_full_name);
 243               schema->stylesheet_xsp
 244                 = xsltParseStylesheetFile((const xmlChar*) tmp_xslt_full_name);
 245               if (!schema->stylesheet_xsp)
 246                 yaz_log(YLOG_WARN,
 247                         "xslt filter: could not parse xslt stylesheet %s",
 248                         tmp_xslt_full_name);
 249             }
 250
 251         }
 252         else if (!XML_STRCMP(ptr->name, "split"))
 253         {
 254             struct _xmlAttr *attr;
 255             for (attr = ptr->properties; attr; attr = attr->next)
 256             {
 257                 attr_content(attr, "level", &tinfo->split_level);
 258                 attr_content(attr, "path", &tinfo->split_path);
 259             }
 260         }
 261         else
 262         {
 263             yaz_log(YLOG_WARN, "Bad element %s in %s", ptr->name, fname);
 264             return ZEBRA_FAIL;
 265         }
 266     }
 267     return ZEBRA_OK;
 268 }
 269
 270 static struct filter_xslt_schema *lookup_schema(struct filter_xslt_info *tinfo,
 271                                            const char *est)
 272 {
 273     struct filter_xslt_schema *schema;
 274     for (schema = tinfo->schemas; schema; schema = schema->next)
 275     {
 276         if (est)
 277         {
 278             if (schema->identifier && !strcmp(schema->identifier, est))
 279                 return schema;
 280             if (schema->name && !strcmp(schema->name, est))
 281                 return schema;
 282         }
 283         if (schema->default_schema)
 284             return schema;
 285     }
 286     return 0;
 287 }
 288
 289 static ZEBRA_RES filter_config(void *clientData, Res res, const char *args)
 290 {
 291     struct filter_xslt_info *tinfo = clientData;
 292     if (!args || !*args){
 293       yaz_log(YLOG_WARN, "xslt filter: need config file");
 294       return ZEBRA_FAIL;
 295     }
 296
 297     if (tinfo->fname && !strcmp(args, tinfo->fname))
 298         return ZEBRA_OK;
 299
 300     tinfo->profile_path
 301       /* = res_get_def(res, "profilePath", DEFAULT_PROFILE_PATH); */
 302       = res_get(res, "profilePath");
 303     yaz_log(YLOG_LOG, "xslt filter: profilePath %s", tinfo->profile_path);
 304
 305     destroy_schemas(tinfo);
 306     create_schemas(tinfo, args);
 307     return ZEBRA_OK;
 308 }
 309
 310 static void filter_destroy(void *clientData)
 311 {
 312     struct filter_xslt_info *tinfo = clientData;
 313     destroy_schemas(tinfo);
 314     if (tinfo->reader)
 315         xmlFreeTextReader(tinfo->reader);
 316     odr_destroy(tinfo->odr);
 317     xfree(tinfo);
 318 }
 319
 320 static int ioread_ex(void *context, char *buffer, int len)
 321 {
 322     struct recExtractCtrl *p = context;
 323     return (*p->readf)(p->fh, buffer, len);
 324 }
 325
 326 static int ioclose_ex(void *context)
 327 {
 328     return 0;
 329 }
 330
 331 static void index_cdata(struct filter_xslt_info *tinfo, struct recExtractCtrl *ctrl,
 332                         xmlNodePtr ptr, RecWord *recWord)
 333 {
 334     for(; ptr; ptr = ptr->next)
 335     {
 336         index_cdata(tinfo, ctrl, ptr->children, recWord);
 337         if (ptr->type != XML_TEXT_NODE)
 338             continue;
 339         recWord->term_buf = (const char *)ptr->content;
 340         recWord->term_len = XML_STRLEN(ptr->content);
 341         (*ctrl->tokenAdd)(recWord);
 342     }
 343 }
 344
 345 static void index_node(struct filter_xslt_info *tinfo,  struct recExtractCtrl *ctrl,
 346                        xmlNodePtr ptr, RecWord *recWord)
 347 {
 348     for(; ptr; ptr = ptr->next)
 349     {
 350         index_node(tinfo, ctrl, ptr->children, recWord);
 351         if (ptr->type != XML_ELEMENT_NODE || !ptr->ns ||
 352             XML_STRCMP(ptr->ns->href, zebra_xslt_ns))
 353             continue;
 354         if (!XML_STRCMP(ptr->name, "index"))
 355         {
 356             const char *name_str = 0;
 357             const char *type_str = 0;
 358             const char *xpath_str = 0;
 359             struct _xmlAttr *attr;
 360             for (attr = ptr->properties; attr; attr = attr->next)
 361             {
 362                 attr_content(attr, "name", &name_str);
 363                 attr_content(attr, "xpath", &xpath_str);
 364                 attr_content(attr, "type", &type_str);
 365             }
 366             if (name_str)
 367             {
 368                 int prev_type = recWord->index_type; /* save default type */
 369
 370                 if (type_str && *type_str)
 371                     recWord->index_type = *type_str; /* type was given */
 372                 recWord->index_name = name_str;
 373                 index_cdata(tinfo, ctrl, ptr->children, recWord);
 374
 375                 recWord->index_type = prev_type;     /* restore it again */
 376             }
 377         }
 378     }
 379 }
 380
 381 static void index_record(struct filter_xslt_info *tinfo,struct recExtractCtrl *ctrl,
 382                          xmlNodePtr ptr, RecWord *recWord)
 383 {
 384     if (ptr && ptr->type == XML_ELEMENT_NODE && ptr->ns &&
 385         !XML_STRCMP(ptr->ns->href, zebra_xslt_ns)
 386         && !XML_STRCMP(ptr->name, "record"))
 387     {
 388         const char *type_str = "update";
 389         const char *id_str = 0;
 390         const char *rank_str = 0;
 391         struct _xmlAttr *attr;
 392         for (attr = ptr->properties; attr; attr = attr->next)
 393         {
 394             attr_content(attr, "type", &type_str);
 395             attr_content(attr, "id", &id_str);
 396             attr_content(attr, "rank", &rank_str);
 397         }
 398         if (id_str)
 399             sscanf(id_str, "%255s", ctrl->match_criteria);
 400         if (rank_str)
 401         {
 402             ctrl->staticrank = atoi(rank_str);
 403             yaz_log(YLOG_LOG, "rank=%d",ctrl->staticrank);
 404         }
 405         else
 406             yaz_log(YLOG_LOG, "no rank");
 407
 408         ptr = ptr->children;
 409     }
 410     index_node(tinfo, ctrl, ptr, recWord);
 411 }
 412
 413 static int extract_doc(struct filter_xslt_info *tinfo, struct recExtractCtrl *p,
 414                        xmlDocPtr doc)
 415 {
 416     RecWord recWord;
 417     const char *params[10];
 418     xmlChar *buf_out;
 419     int len_out;
 420
 421     struct filter_xslt_schema *schema = lookup_schema(tinfo, zebra_xslt_ns);
 422
 423     params[0] = 0;
 424     set_param_str(params, "schema", zebra_xslt_ns, tinfo->odr);
 425
 426     (*p->init)(p, &recWord);
 427
 428     if (schema && schema->stylesheet_xsp)
 429     {
 430         xmlNodePtr root_ptr;
 431         xmlDocPtr resDoc =
 432             xsltApplyStylesheet(schema->stylesheet_xsp,
 433                                 doc, params);
 434         if (p->flagShowRecords)
 435         {
 436             xmlDocDumpMemory(resDoc, &buf_out, &len_out);
 437             fwrite(buf_out, len_out, 1, stdout);
 438             xmlFree(buf_out);
 439         }
 440         root_ptr = xmlDocGetRootElement(resDoc);
 441         if (root_ptr)
 442             index_record(tinfo, p, root_ptr, &recWord);
 443         else
 444         {
 445             yaz_log(YLOG_WARN, "No root for index XML record."
 446                     " split_level=%s stylesheet=%s",
 447                     tinfo->split_level, schema->stylesheet);
 448         }
 449         xmlFreeDoc(resDoc);
 450     }
 451     xmlDocDumpMemory(doc, &buf_out, &len_out);
 452     if (p->flagShowRecords)
 453         fwrite(buf_out, len_out, 1, stdout);
 454     (*p->setStoreData)(p, buf_out, len_out);
 455     xmlFree(buf_out);
 456
 457     xmlFreeDoc(doc);
 458     return RECCTRL_EXTRACT_OK;
 459 }
 460
 461 static int extract_split(struct filter_xslt_info *tinfo, struct recExtractCtrl *p)
 462 {
 463     int ret;
 464     int split_depth = 0;
 465     if (p->first_record)
 466     {
 467         if (tinfo->reader)
 468             xmlFreeTextReader(tinfo->reader);
 469         tinfo->reader = xmlReaderForIO(ioread_ex, ioclose_ex,
 470                                        p /* I/O handler */,
 471                                        0 /* URL */,
 472                                        0 /* encoding */,
 473                                        XML_PARSE_XINCLUDE);
 474     }
 475     if (!tinfo->reader)
 476         return RECCTRL_EXTRACT_ERROR_GENERIC;
 477
 478     if (tinfo->split_level)
 479         split_depth = atoi(tinfo->split_level);
 480     ret = xmlTextReaderRead(tinfo->reader);
 481     while (ret == 1) {
 482         int type = xmlTextReaderNodeType(tinfo->reader);
 483         int depth = xmlTextReaderDepth(tinfo->reader);
 484         if (split_depth == 0 ||
 485             (split_depth > 0 &&
 486              type == XML_READER_TYPE_ELEMENT && split_depth == depth))
 487         {
 488             xmlNodePtr ptr = xmlTextReaderExpand(tinfo->reader);
 489             xmlNodePtr ptr2 = xmlCopyNode(ptr, 1);
 490             xmlDocPtr doc = xmlNewDoc((const xmlChar*) "1.0");
 491
 492             xmlDocSetRootElement(doc, ptr2);
 493
 494             return extract_doc(tinfo, p, doc);
 495         }
 496         ret = xmlTextReaderRead(tinfo->reader);
 497     }
 498     xmlFreeTextReader(tinfo->reader);
 499     tinfo->reader = 0;
 500     return RECCTRL_EXTRACT_EOF;
 501 }
 502
 503 static int extract_full(struct filter_xslt_info *tinfo, struct recExtractCtrl *p)
 504 {
 505     if (p->first_record) /* only one record per stream */
 506     {
 507         xmlDocPtr doc = xmlReadIO(ioread_ex, ioclose_ex, p /* I/O handler */,
 508                                   0 /* URL */,
 509                                   0 /* encoding */,
 510                                   XML_PARSE_XINCLUDE);
 511         if (!doc)
 512         {
 513             return RECCTRL_EXTRACT_ERROR_GENERIC;
 514         }
 515         return extract_doc(tinfo, p, doc);
 516     }
 517     else
 518         return RECCTRL_EXTRACT_EOF;
 519 }
 520
 521 static int filter_extract(void *clientData, struct recExtractCtrl *p)
 522 {
 523     struct filter_xslt_info *tinfo = clientData;
 524
 525     odr_reset(tinfo->odr);
 526
 527     if (tinfo->split_level == 0 && tinfo->split_path == 0)
 528         return extract_full(tinfo, p);
 529     else
 530     {
 531         return extract_split(tinfo, p);
 532     }
 533 }
 534
 535 static int ioread_ret(void *context, char *buffer, int len)
 536 {
 537     struct recRetrieveCtrl *p = context;
 538     return (*p->readf)(p->fh, buffer, len);
 539 }
 540
 541 static int ioclose_ret(void *context)
 542 {
 543     return 0;
 544 }
 545
 546
 547 static const char *snippet_doc(struct recRetrieveCtrl *p, int text_mode,
 548                                int window_size)
 549 {
 550     const char *xml_doc_str;
 551     int ord = 0;
 552     WRBUF wrbuf = wrbuf_alloc();
 553     zebra_snippets *res =
 554         zebra_snippets_window(p->doc_snippet, p->hit_snippet, window_size);
 555     zebra_snippet_word *w = zebra_snippets_list(res);
 556
 557     if (text_mode)
 558         wrbuf_printf(wrbuf, "\'");
 559     else
 560         wrbuf_printf(wrbuf, "<snippet xmlns='%s'>\n", zebra_xslt_ns);
 561     for (; w; w = w->next)
 562     {
 563         if (ord == 0)
 564             ord = w->ord;
 565         else if (ord != w->ord)
 566
 567             break;
 568         if (text_mode)
 569             wrbuf_printf(wrbuf, "%s%s%s ",
 570                          w->match ? "*" : "",
 571                          w->term,
 572                          w->match ? "*" : "");
 573         else
 574         {
 575             wrbuf_printf(wrbuf, " <term ord='%d' seqno='" ZINT_FORMAT "' %s>",
 576                          w->ord, w->seqno,
 577                          (w->match ? "match='1'" : ""));
 578             wrbuf_xmlputs(wrbuf, w->term);
 579             wrbuf_printf(wrbuf, "</term>\n");
 580         }
 581     }
 582     if (text_mode)
 583         wrbuf_printf(wrbuf, "\'");
 584     else
 585         wrbuf_printf(wrbuf, "</snippet>\n");
 586
 587     xml_doc_str = odr_strdup(p->odr, wrbuf_buf(wrbuf));
 588
 589     zebra_snippets_destroy(res);
 590     wrbuf_free(wrbuf, 1);
 591     return xml_doc_str;
 592 }
 593
 594 static int filter_retrieve (void *clientData, struct recRetrieveCtrl *p)
 595 {
 596     const char *esn = zebra_xslt_ns;
 597     const char *params[20];
 598     struct filter_xslt_info *tinfo = clientData;
 599     xmlDocPtr resDoc;
 600     xmlDocPtr doc;
 601     struct filter_xslt_schema *schema;
 602     int window_size = -1;
 603
 604     if (p->comp)
 605     {
 606         if (p->comp->which == Z_RecordComp_simple
 607             && p->comp->u.simple->which == Z_ElementSetNames_generic)
 608         {
 609             esn = p->comp->u.simple->u.generic;
 610         }
 611         else if (p->comp->which == Z_RecordComp_complex
 612                  && p->comp->u.complex->generic->elementSpec
 613                  && p->comp->u.complex->generic->elementSpec->which ==
 614                  Z_ElementSpec_elementSetName)
 615         {
 616             esn = p->comp->u.complex->generic->elementSpec->u.elementSetName;
 617         }
 618     }
 619     schema = lookup_schema(tinfo, esn);
 620     if (!schema)
 621     {
 622         p->diagnostic =
 623             YAZ_BIB1_SPECIFIED_ELEMENT_SET_NAME_NOT_VALID_FOR_SPECIFIED_;
 624         return 0;
 625     }
 626
 627     if (schema->include_snippet)
 628         window_size = atoi(schema->include_snippet);
 629
 630     params[0] = 0;
 631     set_param_int(params, "id", p->localno, p->odr);
 632     if (p->fname)
 633         set_param_str(params, "filename", p->fname, p->odr);
 634     if (p->staticrank >= 0)
 635         set_param_int(params, "rank", p->staticrank, p->odr);
 636     set_param_str(params, "schema", esn, p->odr);
 637     if (p->score >= 0)
 638         set_param_int(params, "score", p->score, p->odr);
 639     set_param_int(params, "size", p->recordSize, p->odr);
 640
 641     if (window_size >= 0)
 642         set_param_xml(params, "snippet", snippet_doc(p, 1, window_size),
 643                       p->odr);
 644     doc = xmlReadIO(ioread_ret, ioclose_ret, p /* I/O handler */,
 645                     0 /* URL */,
 646                     0 /* encoding */,
 647                     XML_PARSE_XINCLUDE);
 648     if (!doc)
 649     {
 650         p->diagnostic = YAZ_BIB1_SYSTEM_ERROR_IN_PRESENTING_RECORDS;
 651         return 0;
 652     }
 653
 654     if (window_size >= 0)
 655     {
 656         xmlNodePtr node = xmlDocGetRootElement(doc);
 657         const char *snippet_str = snippet_doc(p, 0, window_size);
 658         xmlDocPtr snippet_doc = xmlParseMemory(snippet_str, strlen(snippet_str));
 659         xmlAddChild(node, xmlDocGetRootElement(snippet_doc));
 660     }
 661     if (!schema->stylesheet_xsp)
 662         resDoc = doc;
 663     else
 664     {
 665         resDoc = xsltApplyStylesheet(schema->stylesheet_xsp,
 666                                      doc, params);
 667         xmlFreeDoc(doc);
 668     }
 669     if (!resDoc)
 670     {
 671         p->diagnostic = YAZ_BIB1_SYSTEM_ERROR_IN_PRESENTING_RECORDS;
 672     }
 673     else if (p->input_format == VAL_NONE || p->input_format == VAL_TEXT_XML)
 674     {
 675         xmlChar *buf_out;
 676         int len_out;
 677         xmlDocDumpMemory(resDoc, &buf_out, &len_out);
 678
 679         p->output_format = VAL_TEXT_XML;
 680         p->rec_len = len_out;
 681         p->rec_buf = odr_malloc(p->odr, p->rec_len);
 682         memcpy(p->rec_buf, buf_out, p->rec_len);
 683
 684         xmlFree(buf_out);
 685     }
 686     else if (p->output_format == VAL_SUTRS)
 687     {
 688         xmlChar *buf_out;
 689         int len_out;
 690         xmlDocDumpMemory(resDoc, &buf_out, &len_out);
 691
 692         p->output_format = VAL_SUTRS;
 693         p->rec_len = len_out;
 694         p->rec_buf = odr_malloc(p->odr, p->rec_len);
 695         memcpy(p->rec_buf, buf_out, p->rec_len);
 696
 697         xmlFree(buf_out);
 698     }
 699     else
 700     {
 701         p->diagnostic = YAZ_BIB1_RECORD_SYNTAX_UNSUPP;
 702     }
 703     xmlFreeDoc(resDoc);
 704     return 0;
 705 }
 706
 707 static struct recType filter_type = {
 708     0,
 709     "xslt",
 710     filter_init,
 711     filter_config,
 712     filter_destroy,
 713     filter_extract,
 714     filter_retrieve
 715 };
 716
 717 RecType
 718 #ifdef IDZEBRA_STATIC_XSLT
 719 idzebra_filter_xslt
 720 #else
 721 idzebra_filter
 722 #endif
 723
 724 [] = {
 725     &filter_type,
 726     0,
 727 };
 728 /*
 729  * Local variables:
 730  * c-basic-offset: 4
 731  * indent-tabs-mode: nil
 732  * End:
 733  * vim: shiftwidth=4 tabstop=8 expandtab
 734  */
 735