recctrl/xslt.c

   1 /* $Id: xslt.c,v 1.24 2006-05-24 12:56:56 marc 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         /* find requested schema */
 277         if (est)
 278         {
 279             if (schema->identifier && !strcmp(schema->identifier, est))
 280                 return schema;
 281
 282             if (schema->name && !strcmp(schema->name, est))
 283                 return schema;
 284         }
 285         /* or return default schema if defined */
 286         else if (schema->default_schema)
 287             return schema;
 288     }
 289
 290     /* return first schema if no default schema defined */
 291     if (tinfo->schemas)
 292         return tinfo->schemas;
 293
 294     return 0;
 295 }
 296
 297 static ZEBRA_RES filter_config(void *clientData, Res res, const char *args)
 298 {
 299     struct filter_xslt_info *tinfo = clientData;
 300     if (!args || !*args){
 301       yaz_log(YLOG_WARN, "xslt filter: need config file");
 302       return ZEBRA_FAIL;
 303     }
 304
 305     if (tinfo->fname && !strcmp(args, tinfo->fname))
 306         return ZEBRA_OK;
 307
 308     tinfo->profile_path
 309       /* = res_get_def(res, "profilePath", DEFAULT_PROFILE_PATH); */
 310       = res_get(res, "profilePath");
 311     yaz_log(YLOG_LOG, "xslt filter: profilePath %s", tinfo->profile_path);
 312
 313     destroy_schemas(tinfo);
 314     create_schemas(tinfo, args);
 315     return ZEBRA_OK;
 316 }
 317
 318 static void filter_destroy(void *clientData)
 319 {
 320     struct filter_xslt_info *tinfo = clientData;
 321     destroy_schemas(tinfo);
 322     if (tinfo->reader)
 323         xmlFreeTextReader(tinfo->reader);
 324     odr_destroy(tinfo->odr);
 325     xfree(tinfo);
 326 }
 327
 328 static int ioread_ex(void *context, char *buffer, int len)
 329 {
 330     struct recExtractCtrl *p = context;
 331     return (*p->readf)(p->fh, buffer, len);
 332 }
 333
 334 static int ioclose_ex(void *context)
 335 {
 336     return 0;
 337 }
 338
 339 static void index_cdata(struct filter_xslt_info *tinfo, struct recExtractCtrl *ctrl,
 340                         xmlNodePtr ptr, RecWord *recWord)
 341 {
 342     for(; ptr; ptr = ptr->next)
 343     {
 344         index_cdata(tinfo, ctrl, ptr->children, recWord);
 345         if (ptr->type != XML_TEXT_NODE)
 346             continue;
 347         recWord->term_buf = (const char *)ptr->content;
 348         recWord->term_len = XML_STRLEN(ptr->content);
 349         (*ctrl->tokenAdd)(recWord);
 350     }
 351 }
 352
 353 static void index_node(struct filter_xslt_info *tinfo,  struct recExtractCtrl *ctrl,
 354                        xmlNodePtr ptr, RecWord *recWord)
 355 {
 356     for(; ptr; ptr = ptr->next)
 357     {
 358         index_node(tinfo, ctrl, ptr->children, recWord);
 359         if (ptr->type != XML_ELEMENT_NODE || !ptr->ns ||
 360             XML_STRCMP(ptr->ns->href, zebra_xslt_ns))
 361             continue;
 362         if (!XML_STRCMP(ptr->name, "index"))
 363         {
 364             const char *name_str = 0;
 365             const char *type_str = 0;
 366             const char *xpath_str = 0;
 367             struct _xmlAttr *attr;
 368             for (attr = ptr->properties; attr; attr = attr->next)
 369             {
 370                 attr_content(attr, "name", &name_str);
 371                 attr_content(attr, "xpath", &xpath_str);
 372                 attr_content(attr, "type", &type_str);
 373             }
 374             if (name_str)
 375             {
 376                 int prev_type = recWord->index_type; /* save default type */
 377
 378                 if (type_str && *type_str)
 379                     recWord->index_type = *type_str; /* type was given */
 380                 recWord->index_name = name_str;
 381                 index_cdata(tinfo, ctrl, ptr->children, recWord);
 382
 383                 recWord->index_type = prev_type;     /* restore it again */
 384             }
 385         }
 386     }
 387 }
 388
 389 static void index_record(struct filter_xslt_info *tinfo,struct recExtractCtrl *ctrl,
 390                          xmlNodePtr ptr, RecWord *recWord)
 391 {
 392     if (ptr && ptr->type == XML_ELEMENT_NODE && ptr->ns &&
 393         !XML_STRCMP(ptr->ns->href, zebra_xslt_ns)
 394         && !XML_STRCMP(ptr->name, "record"))
 395     {
 396         const char *type_str = "update";
 397         const char *id_str = 0;
 398         const char *rank_str = 0;
 399         struct _xmlAttr *attr;
 400         for (attr = ptr->properties; attr; attr = attr->next)
 401         {
 402             attr_content(attr, "type", &type_str);
 403             attr_content(attr, "id", &id_str);
 404             attr_content(attr, "rank", &rank_str);
 405         }
 406         if (id_str)
 407             sscanf(id_str, "%255s", ctrl->match_criteria);
 408         if (rank_str)
 409         {
 410             ctrl->staticrank = atoi(rank_str);
 411             yaz_log(YLOG_LOG, "rank=%d",ctrl->staticrank);
 412         }
 413         else
 414             yaz_log(YLOG_LOG, "no rank");
 415
 416         ptr = ptr->children;
 417     }
 418     index_node(tinfo, ctrl, ptr, recWord);
 419 }
 420
 421 static int extract_doc(struct filter_xslt_info *tinfo, struct recExtractCtrl *p,
 422                        xmlDocPtr doc)
 423 {
 424     RecWord recWord;
 425     const char *params[10];
 426     xmlChar *buf_out;
 427     int len_out;
 428
 429     struct filter_xslt_schema *schema = lookup_schema(tinfo, zebra_xslt_ns);
 430
 431     params[0] = 0;
 432     set_param_str(params, "schema", zebra_xslt_ns, tinfo->odr);
 433
 434     (*p->init)(p, &recWord);
 435
 436     if (schema && schema->stylesheet_xsp)
 437     {
 438         xmlNodePtr root_ptr;
 439         xmlDocPtr resDoc =
 440             xsltApplyStylesheet(schema->stylesheet_xsp,
 441                                 doc, params);
 442         if (p->flagShowRecords)
 443         {
 444             xmlDocDumpMemory(resDoc, &buf_out, &len_out);
 445             fwrite(buf_out, len_out, 1, stdout);
 446             xmlFree(buf_out);
 447         }
 448         root_ptr = xmlDocGetRootElement(resDoc);
 449         if (root_ptr)
 450             index_record(tinfo, p, root_ptr, &recWord);
 451         else
 452         {
 453             yaz_log(YLOG_WARN, "No root for index XML record."
 454                     " split_level=%s stylesheet=%s",
 455                     tinfo->split_level, schema->stylesheet);
 456         }
 457         xmlFreeDoc(resDoc);
 458     }
 459     xmlDocDumpMemory(doc, &buf_out, &len_out);
 460     if (p->flagShowRecords)
 461         fwrite(buf_out, len_out, 1, stdout);
 462     (*p->setStoreData)(p, buf_out, len_out);
 463     xmlFree(buf_out);
 464
 465     xmlFreeDoc(doc);
 466     return RECCTRL_EXTRACT_OK;
 467 }
 468
 469 static int extract_split(struct filter_xslt_info *tinfo, struct recExtractCtrl *p)
 470 {
 471     int ret;
 472     int split_depth = 0;
 473     if (p->first_record)
 474     {
 475         if (tinfo->reader)
 476             xmlFreeTextReader(tinfo->reader);
 477         tinfo->reader = xmlReaderForIO(ioread_ex, ioclose_ex,
 478                                        p /* I/O handler */,
 479                                        0 /* URL */,
 480                                        0 /* encoding */,
 481                                        XML_PARSE_XINCLUDE);
 482     }
 483     if (!tinfo->reader)
 484         return RECCTRL_EXTRACT_ERROR_GENERIC;
 485
 486     if (tinfo->split_level)
 487         split_depth = atoi(tinfo->split_level);
 488     ret = xmlTextReaderRead(tinfo->reader);
 489     while (ret == 1) {
 490         int type = xmlTextReaderNodeType(tinfo->reader);
 491         int depth = xmlTextReaderDepth(tinfo->reader);
 492         if (split_depth == 0 ||
 493             (split_depth > 0 &&
 494              type == XML_READER_TYPE_ELEMENT && split_depth == depth))
 495         {
 496             xmlNodePtr ptr = xmlTextReaderExpand(tinfo->reader);
 497             xmlNodePtr ptr2 = xmlCopyNode(ptr, 1);
 498             xmlDocPtr doc = xmlNewDoc((const xmlChar*) "1.0");
 499
 500             xmlDocSetRootElement(doc, ptr2);
 501
 502             return extract_doc(tinfo, p, doc);
 503         }
 504         ret = xmlTextReaderRead(tinfo->reader);
 505     }
 506     xmlFreeTextReader(tinfo->reader);
 507     tinfo->reader = 0;
 508     return RECCTRL_EXTRACT_EOF;
 509 }
 510
 511 static int extract_full(struct filter_xslt_info *tinfo, struct recExtractCtrl *p)
 512 {
 513     if (p->first_record) /* only one record per stream */
 514     {
 515         xmlDocPtr doc = xmlReadIO(ioread_ex, ioclose_ex, p /* I/O handler */,
 516                                   0 /* URL */,
 517                                   0 /* encoding */,
 518                                   XML_PARSE_XINCLUDE);
 519         if (!doc)
 520         {
 521             return RECCTRL_EXTRACT_ERROR_GENERIC;
 522         }
 523         return extract_doc(tinfo, p, doc);
 524     }
 525     else
 526         return RECCTRL_EXTRACT_EOF;
 527 }
 528
 529 static int filter_extract(void *clientData, struct recExtractCtrl *p)
 530 {
 531     struct filter_xslt_info *tinfo = clientData;
 532
 533     odr_reset(tinfo->odr);
 534
 535     if (tinfo->split_level == 0 && tinfo->split_path == 0)
 536         return extract_full(tinfo, p);
 537     else
 538     {
 539         return extract_split(tinfo, p);
 540     }
 541 }
 542
 543 static int ioread_ret(void *context, char *buffer, int len)
 544 {
 545     struct recRetrieveCtrl *p = context;
 546     return (*p->readf)(p->fh, buffer, len);
 547 }
 548
 549 static int ioclose_ret(void *context)
 550 {
 551     return 0;
 552 }
 553
 554
 555 static const char *snippet_doc(struct recRetrieveCtrl *p, int text_mode,
 556                                int window_size)
 557 {
 558     const char *xml_doc_str;
 559     int ord = 0;
 560     WRBUF wrbuf = wrbuf_alloc();
 561     zebra_snippets *res =
 562         zebra_snippets_window(p->doc_snippet, p->hit_snippet, window_size);
 563     zebra_snippet_word *w = zebra_snippets_list(res);
 564
 565     if (text_mode)
 566         wrbuf_printf(wrbuf, "\'");
 567     else
 568         wrbuf_printf(wrbuf, "<snippet xmlns='%s'>\n", zebra_xslt_ns);
 569     for (; w; w = w->next)
 570     {
 571         if (ord == 0)
 572             ord = w->ord;
 573         else if (ord != w->ord)
 574
 575             break;
 576         if (text_mode)
 577             wrbuf_printf(wrbuf, "%s%s%s ",
 578                          w->match ? "*" : "",
 579                          w->term,
 580                          w->match ? "*" : "");
 581         else
 582         {
 583             wrbuf_printf(wrbuf, " <term ord='%d' seqno='" ZINT_FORMAT "' %s>",
 584                          w->ord, w->seqno,
 585                          (w->match ? "match='1'" : ""));
 586             wrbuf_xmlputs(wrbuf, w->term);
 587             wrbuf_printf(wrbuf, "</term>\n");
 588         }
 589     }
 590     if (text_mode)
 591         wrbuf_printf(wrbuf, "\'");
 592     else
 593         wrbuf_printf(wrbuf, "</snippet>\n");
 594
 595     xml_doc_str = odr_strdup(p->odr, wrbuf_buf(wrbuf));
 596
 597     zebra_snippets_destroy(res);
 598     wrbuf_free(wrbuf, 1);
 599     return xml_doc_str;
 600 }
 601
 602 static int filter_retrieve (void *clientData, struct recRetrieveCtrl *p)
 603 {
 604     const char *esn = 0;
 605     const char *params[32];
 606     struct filter_xslt_info *tinfo = clientData;
 607     xmlDocPtr resDoc;
 608     xmlDocPtr doc;
 609     struct filter_xslt_schema *schema;
 610     int window_size = -1;
 611
 612     if (p->comp)
 613     {
 614         if (p->comp->which == Z_RecordComp_simple
 615             && p->comp->u.simple->which == Z_ElementSetNames_generic)
 616         {
 617             esn = p->comp->u.simple->u.generic;
 618         }
 619         else if (p->comp->which == Z_RecordComp_complex
 620                  && p->comp->u.complex->generic->elementSpec
 621                  && p->comp->u.complex->generic->elementSpec->which ==
 622                  Z_ElementSpec_elementSetName)
 623         {
 624             esn = p->comp->u.complex->generic->elementSpec->u.elementSetName;
 625         }
 626     }
 627     schema = lookup_schema(tinfo, esn);
 628     if (!schema)
 629     {
 630         p->diagnostic =
 631             YAZ_BIB1_SPECIFIED_ELEMENT_SET_NAME_NOT_VALID_FOR_SPECIFIED_;
 632         return 0;
 633     }
 634
 635     if (schema->include_snippet)
 636         window_size = atoi(schema->include_snippet);
 637
 638     params[0] = 0;
 639     set_param_int(params, "id", p->localno, p->odr);
 640     if (p->fname)
 641         set_param_str(params, "filename", p->fname, p->odr);
 642     if (p->staticrank >= 0)
 643         set_param_int(params, "rank", p->staticrank, p->odr);
 644
 645      if (esn)
 646         set_param_str(params, "schema", esn, p->odr);
 647     else
 648         if (schema->name)
 649             set_param_str(params, "schema", schema->name, p->odr);
 650         else if (schema->identifier)
 651             set_param_str(params, "schema", schema->identifier, p->odr);
 652         else
 653             set_param_str(params, "schema", "", p->odr);
 654
 655     if (p->score >= 0)
 656         set_param_int(params, "score", p->score, p->odr);
 657     set_param_int(params, "size", p->recordSize, p->odr);
 658
 659     if (window_size >= 0)
 660         set_param_xml(params, "snippet", snippet_doc(p, 1, window_size),
 661                       p->odr);
 662     doc = xmlReadIO(ioread_ret, ioclose_ret, p /* I/O handler */,
 663                     0 /* URL */,
 664                     0 /* encoding */,
 665                     XML_PARSE_XINCLUDE);
 666     if (!doc)
 667     {
 668         p->diagnostic = YAZ_BIB1_SYSTEM_ERROR_IN_PRESENTING_RECORDS;
 669         return 0;
 670     }
 671
 672     if (window_size >= 0)
 673     {
 674         xmlNodePtr node = xmlDocGetRootElement(doc);
 675         const char *snippet_str = snippet_doc(p, 0, window_size);
 676         xmlDocPtr snippet_doc = xmlParseMemory(snippet_str, strlen(snippet_str));
 677         xmlAddChild(node, xmlDocGetRootElement(snippet_doc));
 678     }
 679     if (!schema->stylesheet_xsp)
 680         resDoc = doc;
 681     else
 682     {
 683         resDoc = xsltApplyStylesheet(schema->stylesheet_xsp,
 684                                      doc, params);
 685         xmlFreeDoc(doc);
 686     }
 687     if (!resDoc)
 688     {
 689         p->diagnostic = YAZ_BIB1_SYSTEM_ERROR_IN_PRESENTING_RECORDS;
 690     }
 691     else if (p->input_format == VAL_NONE || p->input_format == VAL_TEXT_XML)
 692     {
 693         xmlChar *buf_out;
 694         int len_out;
 695         xmlDocDumpMemory(resDoc, &buf_out, &len_out);
 696
 697         p->output_format = VAL_TEXT_XML;
 698         p->rec_len = len_out;
 699         p->rec_buf = odr_malloc(p->odr, p->rec_len);
 700         memcpy(p->rec_buf, buf_out, p->rec_len);
 701
 702         xmlFree(buf_out);
 703     }
 704     else if (p->output_format == VAL_SUTRS)
 705     {
 706         xmlChar *buf_out;
 707         int len_out;
 708         xmlDocDumpMemory(resDoc, &buf_out, &len_out);
 709
 710         p->output_format = VAL_SUTRS;
 711         p->rec_len = len_out;
 712         p->rec_buf = odr_malloc(p->odr, p->rec_len);
 713         memcpy(p->rec_buf, buf_out, p->rec_len);
 714
 715         xmlFree(buf_out);
 716     }
 717     else
 718     {
 719         p->diagnostic = YAZ_BIB1_RECORD_SYNTAX_UNSUPP;
 720     }
 721     xmlFreeDoc(resDoc);
 722     return 0;
 723 }
 724
 725 static struct recType filter_type = {
 726     0,
 727     "xslt",
 728     filter_init,
 729     filter_config,
 730     filter_destroy,
 731     filter_extract,
 732     filter_retrieve
 733 };
 734
 735 RecType
 736 #ifdef IDZEBRA_STATIC_XSLT
 737 idzebra_filter_xslt
 738 #else
 739 idzebra_filter
 740 #endif
 741
 742 [] = {
 743     &filter_type,
 744     0,
 745 };
 746 /*
 747  * Local variables:
 748  * c-basic-offset: 4
 749  * indent-tabs-mode: nil
 750  * End:
 751  * vim: shiftwidth=4 tabstop=8 expandtab
 752  */
 753