index/alvis.c

   1 /* $Id: alvis.c,v 1.6 2006-11-16 13:27:54 adam Exp $
   2    Copyright (C) 1995-2006
   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 this program; if not, write to the Free Software
  19 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  20
  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 #include <libxslt/xsltutils.h>
  37
  38 #if YAZ_HAVE_EXSLT
  39 #include <libexslt/exslt.h>
  40 #endif
  41
  42 #include <idzebra/util.h>
  43 #include <idzebra/recctrl.h>
  44
  45 struct filter_schema {
  46     const char *name;
  47     const char *identifier;
  48     const char *stylesheet;
  49     struct filter_schema *next;
  50     const char *default_schema;
  51     /* char default_schema; */
  52     const char *include_snippet;
  53     xsltStylesheetPtr stylesheet_xsp;
  54 };
  55
  56 struct filter_info {
  57     xmlDocPtr doc;
  58     char *fname;
  59     char *full_name;
  60     const char *profile_path;
  61     int split_level;
  62     const char *split_path;
  63     ODR odr;
  64     struct filter_schema *schemas;
  65     xmlTextReaderPtr reader;
  66 };
  67
  68 #define ZEBRA_SCHEMA_XSLT_NS "http://indexdata.dk/zebra/xslt/1"
  69
  70 #define XML_STRCMP(a,b)   strcmp((char*)a, b)
  71 #define XML_STRLEN(a) strlen((char*)a)
  72
  73 static const char *zebra_xslt_ns = ZEBRA_SCHEMA_XSLT_NS;
  74
  75 static void set_param_xml(const char **params, const char *name,
  76                           const char *value, ODR odr)
  77 {
  78     while (*params)
  79         params++;
  80     params[0] = name;
  81     params[1] = value;
  82     params[2] = 0;
  83 }
  84
  85 static void set_param_str(const char **params, const char *name,
  86                           const char *value, ODR odr)
  87 {
  88     char *quoted = odr_malloc(odr, 3 + strlen(value));
  89     sprintf(quoted, "'%s'", value);
  90     while (*params)
  91         params++;
  92     params[0] = name;
  93     params[1] = quoted;
  94     params[2] = 0;
  95 }
  96
  97 static void set_param_int(const char **params, const char *name,
  98                           zint value, ODR odr)
  99 {
 100     char *quoted = odr_malloc(odr, 30); /* 25 digits enough for 2^64 */
 101     while (*params)
 102         params++;
 103     sprintf(quoted, "'" ZINT_FORMAT "'", value);
 104     params[0] = name;
 105     params[1] = quoted;
 106     params[2] = 0;
 107 }
 108
 109 #define ENABLE_INPUT_CALLBACK 0
 110
 111 #if ENABLE_INPUT_CALLBACK
 112 static int zebra_xmlInputMatchCallback (char const *filename)
 113 {
 114     yaz_log(YLOG_LOG, "match %s", filename);
 115     return 0;
 116 }
 117
 118 static void * zebra_xmlInputOpenCallback (char const *filename)
 119 {
 120     return 0;
 121 }
 122
 123 static int zebra_xmlInputReadCallback (void * context, char * buffer, int len)
 124 {
 125     return 0;
 126 }
 127
 128 static int zebra_xmlInputCloseCallback (void * context)
 129 {
 130     return 0;
 131 }
 132 #endif
 133
 134 static void *filter_init(Res res, RecType recType)
 135 {
 136     struct filter_info *tinfo = (struct filter_info *) xmalloc(sizeof(*tinfo));
 137     tinfo->reader = 0;
 138     tinfo->fname = 0;
 139     tinfo->full_name = 0;
 140     tinfo->profile_path = 0;
 141     tinfo->split_level = 0;
 142     tinfo->split_path = 0;
 143     tinfo->odr = odr_createmem(ODR_ENCODE);
 144     tinfo->doc = 0;
 145     tinfo->schemas = 0;
 146
 147 #if YAZ_HAVE_EXSLT
 148     exsltRegisterAll();
 149 #endif
 150
 151 #if ENABLE_INPUT_CALLBACK
 152     xmlRegisterDefaultInputCallbacks();
 153     xmlRegisterInputCallbacks(zebra_xmlInputMatchCallback,
 154                               zebra_xmlInputOpenCallback,
 155                               zebra_xmlInputReadCallback,
 156                               zebra_xmlInputCloseCallback);
 157 #endif
 158     return tinfo;
 159 }
 160
 161 static int attr_content(struct _xmlAttr *attr, const char *name,
 162                         const char **dst_content)
 163 {
 164     if (!XML_STRCMP(attr->name, name) && attr->children &&
 165         attr->children->type == XML_TEXT_NODE)
 166     {
 167         *dst_content = (const char *)(attr->children->content);
 168         return 1;
 169     }
 170     return 0;
 171 }
 172
 173 static void destroy_schemas(struct filter_info *tinfo)
 174 {
 175     struct filter_schema *schema = tinfo->schemas;
 176     while (schema)
 177     {
 178         struct filter_schema *schema_next = schema->next;
 179         if (schema->stylesheet_xsp)
 180             xsltFreeStylesheet(schema->stylesheet_xsp);
 181         xfree(schema);
 182         schema = schema_next;
 183     }
 184     tinfo->schemas = 0;
 185     xfree(tinfo->fname);
 186     if (tinfo->doc)
 187         xmlFreeDoc(tinfo->doc);
 188     tinfo->doc = 0;
 189 }
 190
 191 static ZEBRA_RES create_schemas(struct filter_info *tinfo, const char *fname)
 192 {
 193     char tmp_full_name[1024];
 194     xmlNodePtr ptr;
 195     tinfo->fname = xstrdup(fname);
 196
 197    if (yaz_filepath_resolve(tinfo->fname, tinfo->profile_path,
 198                              NULL, tmp_full_name))
 199       tinfo->full_name = xstrdup(tmp_full_name);
 200     else
 201       tinfo->full_name = xstrdup(tinfo->fname);
 202
 203     yaz_log(YLOG_LOG, "alvis filter: loading config file %s", tinfo->full_name);
 204
 205     tinfo->doc = xmlParseFile(tinfo->full_name);
 206
 207     if (!tinfo->doc){
 208         yaz_log(YLOG_WARN, "alvis filter: could not parse config file %s",
 209                 tinfo->full_name);
 210
 211         return ZEBRA_FAIL;
 212     }
 213
 214     ptr = xmlDocGetRootElement(tinfo->doc);
 215     if (!ptr || ptr->type != XML_ELEMENT_NODE ||
 216         XML_STRCMP(ptr->name, "schemaInfo")){
 217         yaz_log(YLOG_WARN,
 218                 "alvis filter:  config file %s :"
 219                 " expected root element <schemaInfo>",
 220                 tinfo->full_name);
 221         return ZEBRA_FAIL;
 222     }
 223
 224     for (ptr = ptr->children; ptr; ptr = ptr->next)
 225     {
 226         if (ptr->type != XML_ELEMENT_NODE)
 227             continue;
 228         if (!XML_STRCMP(ptr->name, "schema"))
 229         {
 230             struct _xmlAttr *attr;
 231             struct filter_schema *schema = xmalloc(sizeof(*schema));
 232             schema->name = 0;
 233             schema->identifier = 0;
 234             schema->stylesheet = 0;
 235             schema->default_schema = 0;
 236             schema->next = tinfo->schemas;
 237             schema->stylesheet_xsp = 0;
 238             schema->include_snippet = 0;
 239             tinfo->schemas = schema;
 240             for (attr = ptr->properties; attr; attr = attr->next)
 241             {
 242                 attr_content(attr, "identifier", &schema->identifier);
 243                 attr_content(attr, "name", &schema->name);
 244                 attr_content(attr, "stylesheet", &schema->stylesheet);
 245                 attr_content(attr, "default", &schema->default_schema);
 246                 attr_content(attr, "snippet", &schema->include_snippet);
 247             }
 248             /*yaz_log(YLOG_LOG, "XSLT add %s %s %s",
 249               schema->name, schema->identifier, schema->stylesheet); */
 250
 251             /* find requested schema */
 252
 253             if (schema->stylesheet)
 254             {
 255                 char tmp_xslt_full_name[1024];
 256                 if (!yaz_filepath_resolve(schema->stylesheet, tinfo->profile_path,
 257                                           NULL, tmp_xslt_full_name))
 258                 {
 259                     yaz_log(YLOG_WARN,
 260                             "alvis filter: stylesheet %s not found in path %s",
 261                             schema->stylesheet, tinfo->profile_path);
 262                     return ZEBRA_FAIL;
 263                 }
 264                 schema->stylesheet_xsp
 265                     = xsltParseStylesheetFile((const xmlChar*) tmp_xslt_full_name);
 266                 if (!schema->stylesheet_xsp)
 267                 {
 268                     yaz_log(YLOG_WARN,
 269                             "alvis filter: could not parse xslt stylesheet %s",
 270                             tmp_xslt_full_name);
 271                     return ZEBRA_FAIL;
 272                 }
 273             }
 274         }
 275         else if (!XML_STRCMP(ptr->name, "split"))
 276         {
 277             struct _xmlAttr *attr;
 278             for (attr = ptr->properties; attr; attr = attr->next)
 279             {
 280                 const char *split_level_str = 0;
 281                 attr_content(attr, "level", &split_level_str);
 282                 tinfo->split_level =
 283                     split_level_str ? atoi(split_level_str) : 0;
 284             }
 285         }
 286         else
 287         {
 288             yaz_log(YLOG_WARN, "Bad element %s in %s", ptr->name, fname);
 289             return ZEBRA_FAIL;
 290         }
 291     }
 292     return ZEBRA_OK;
 293 }
 294
 295 static struct filter_schema *lookup_schema(struct filter_info *tinfo,
 296                                            const char *est)
 297 {
 298     struct filter_schema *schema;
 299
 300     for (schema = tinfo->schemas; schema; schema = schema->next)
 301     {
 302         /* find requested schema */
 303         if (est)
 304         {
 305             if (schema->identifier && !strcmp(schema->identifier, est))
 306                 return schema;
 307
 308             if (schema->name && !strcmp(schema->name, est))
 309                 return schema;
 310         }
 311         /* or return default schema if defined */
 312         else if (schema->default_schema)
 313             return schema;
 314     }
 315
 316     /* return first schema if no default schema defined */
 317     if (tinfo->schemas)
 318         return tinfo->schemas;
 319
 320     return 0;
 321 }
 322
 323 static ZEBRA_RES filter_config(void *clientData, Res res, const char *args)
 324 {
 325     struct filter_info *tinfo = clientData;
 326     if (!args || !*args)
 327     {
 328         yaz_log(YLOG_WARN, "alvis filter: need config file");
 329         return ZEBRA_FAIL;
 330     }
 331
 332     if (tinfo->fname && !strcmp(args, tinfo->fname))
 333         return ZEBRA_OK;
 334
 335     tinfo->profile_path = res_get(res, "profilePath");
 336     yaz_log(YLOG_LOG, "alvis filter: profilePath %s", tinfo->profile_path);
 337
 338     destroy_schemas(tinfo);
 339     return create_schemas(tinfo, args);
 340 }
 341
 342 static void filter_destroy(void *clientData)
 343 {
 344     struct filter_info *tinfo = clientData;
 345     destroy_schemas(tinfo);
 346     if (tinfo->reader)
 347         xmlFreeTextReader(tinfo->reader);
 348     odr_destroy(tinfo->odr);
 349     xfree(tinfo);
 350 }
 351
 352 static int ioread_ex(void *context, char *buffer, int len)
 353 {
 354     struct recExtractCtrl *p = context;
 355     return p->stream->readf(p->stream, buffer, len);
 356 }
 357
 358 static int ioclose_ex(void *context)
 359 {
 360     return 0;
 361 }
 362
 363 static void index_cdata(struct filter_info *tinfo, struct recExtractCtrl *ctrl,
 364                         xmlNodePtr ptr, RecWord *recWord)
 365 {
 366     for(; ptr; ptr = ptr->next)
 367     {
 368         index_cdata(tinfo, ctrl, ptr->children, recWord);
 369         if (ptr->type != XML_TEXT_NODE)
 370             continue;
 371         recWord->term_buf = (const char *)ptr->content;
 372         recWord->term_len = XML_STRLEN(ptr->content);
 373         (*ctrl->tokenAdd)(recWord);
 374     }
 375 }
 376
 377 static void index_node(struct filter_info *tinfo,  struct recExtractCtrl *ctrl,
 378                        xmlNodePtr ptr, RecWord *recWord)
 379 {
 380     for(; ptr; ptr = ptr->next)
 381     {
 382         index_node(tinfo, ctrl, ptr->children, recWord);
 383         if (ptr->type != XML_ELEMENT_NODE || !ptr->ns ||
 384             XML_STRCMP(ptr->ns->href, zebra_xslt_ns))
 385             continue;
 386         if (!XML_STRCMP(ptr->name, "index"))
 387         {
 388             const char *name_str = 0;
 389             const char *type_str = 0;
 390             const char *xpath_str = 0;
 391             struct _xmlAttr *attr;
 392             for (attr = ptr->properties; attr; attr = attr->next)
 393             {
 394                 attr_content(attr, "name", &name_str);
 395                 attr_content(attr, "xpath", &xpath_str);
 396                 attr_content(attr, "type", &type_str);
 397             }
 398             if (name_str)
 399             {
 400                 int prev_type = recWord->index_type; /* save default type */
 401
 402                 if (type_str && *type_str)
 403                     recWord->index_type = *type_str; /* type was given */
 404                 recWord->index_name = name_str;
 405                 index_cdata(tinfo, ctrl, ptr->children, recWord);
 406
 407                 recWord->index_type = prev_type;     /* restore it again */
 408             }
 409         }
 410     }
 411 }
 412
 413 static void index_record(struct filter_info *tinfo,struct recExtractCtrl *ctrl,
 414                          xmlNodePtr ptr, RecWord *recWord)
 415 {
 416     const char *type_str = "update";
 417
 418     if (ptr && ptr->type == XML_ELEMENT_NODE && ptr->ns &&
 419         !XML_STRCMP(ptr->ns->href, zebra_xslt_ns)
 420         && !XML_STRCMP(ptr->name, "record"))
 421     {
 422         const char *id_str = 0;
 423         const char *rank_str = 0;
 424         struct _xmlAttr *attr;
 425         for (attr = ptr->properties; attr; attr = attr->next)
 426         {
 427             attr_content(attr, "type", &type_str);
 428             attr_content(attr, "id", &id_str);
 429             attr_content(attr, "rank", &rank_str);
 430         }
 431         if (id_str)
 432             sscanf(id_str, "%255s", ctrl->match_criteria);
 433
 434         if (rank_str)
 435             ctrl->staticrank = atoi(rank_str);
 436
 437         ptr = ptr->children;
 438     }
 439
 440     if (!strcmp("update", type_str))
 441         index_node(tinfo, ctrl, ptr, recWord);
 442     else if (!strcmp("delete", type_str))
 443          yaz_log(YLOG_WARN, "alvis filter delete: to be implemented");
 444     else
 445          yaz_log(YLOG_WARN, "alvis filter: unknown record type '%s'",
 446                  type_str);
 447 }
 448
 449 static int extract_doc(struct filter_info *tinfo, struct recExtractCtrl *p,
 450                        xmlDocPtr doc)
 451 {
 452     RecWord recWord;
 453     const char *params[10];
 454     xmlChar *buf_out;
 455     int len_out;
 456
 457     struct filter_schema *schema = lookup_schema(tinfo, zebra_xslt_ns);
 458
 459     params[0] = 0;
 460     set_param_str(params, "schema", zebra_xslt_ns, tinfo->odr);
 461
 462     (*p->init)(p, &recWord);
 463
 464     if (schema && schema->stylesheet_xsp)
 465     {
 466         xmlNodePtr root_ptr;
 467         xmlDocPtr resDoc =
 468             xsltApplyStylesheet(schema->stylesheet_xsp,
 469                                 doc, params);
 470         if (p->flagShowRecords)
 471         {
 472             xmlDocDumpMemory(resDoc, &buf_out, &len_out);
 473             fwrite(buf_out, len_out, 1, stdout);
 474             xmlFree(buf_out);
 475         }
 476         root_ptr = xmlDocGetRootElement(resDoc);
 477         if (root_ptr)
 478             index_record(tinfo, p, root_ptr, &recWord);
 479         else
 480         {
 481             yaz_log(YLOG_WARN, "No root for index XML record."
 482                     " split_level=%d stylesheet=%s",
 483                     tinfo->split_level, schema->stylesheet);
 484         }
 485         xmlFreeDoc(resDoc);
 486     }
 487     xmlDocDumpMemory(doc, &buf_out, &len_out);
 488     if (p->flagShowRecords)
 489         fwrite(buf_out, len_out, 1, stdout);
 490     (*p->setStoreData)(p, buf_out, len_out);
 491     xmlFree(buf_out);
 492
 493     xmlFreeDoc(doc);
 494     return RECCTRL_EXTRACT_OK;
 495 }
 496
 497 static int extract_split(struct filter_info *tinfo, struct recExtractCtrl *p)
 498 {
 499     int ret;
 500
 501     if (p->first_record)
 502     {
 503         if (tinfo->reader)
 504             xmlFreeTextReader(tinfo->reader);
 505         tinfo->reader = xmlReaderForIO(ioread_ex, ioclose_ex,
 506                                        p /* I/O handler */,
 507                                        0 /* URL */,
 508                                        0 /* encoding */,
 509                                        XML_PARSE_XINCLUDE);
 510     }
 511     if (!tinfo->reader)
 512         return RECCTRL_EXTRACT_ERROR_GENERIC;
 513
 514     ret = xmlTextReaderRead(tinfo->reader);
 515     while (ret == 1)
 516     {
 517         int type = xmlTextReaderNodeType(tinfo->reader);
 518         int depth = xmlTextReaderDepth(tinfo->reader);
 519         if (tinfo->split_level == 0 ||
 520             (tinfo->split_level > 0 &&
 521              type == XML_READER_TYPE_ELEMENT && tinfo->split_level == depth))
 522         {
 523             xmlNodePtr ptr = xmlTextReaderExpand(tinfo->reader);
 524             if (ptr)
 525             {
 526                 xmlNodePtr ptr2 = xmlCopyNode(ptr, 1);
 527                 xmlDocPtr doc = xmlNewDoc((const xmlChar*) "1.0");
 528
 529                 xmlDocSetRootElement(doc, ptr2);
 530
 531                 return extract_doc(tinfo, p, doc);
 532             }
 533             else
 534             {
 535                 xmlFreeTextReader(tinfo->reader);
 536                 tinfo->reader = 0;
 537                 return RECCTRL_EXTRACT_ERROR_GENERIC;
 538             }
 539         }
 540         ret = xmlTextReaderRead(tinfo->reader);
 541     }
 542     xmlFreeTextReader(tinfo->reader);
 543     tinfo->reader = 0;
 544     return RECCTRL_EXTRACT_EOF;
 545 }
 546
 547 static int filter_extract(void *clientData, struct recExtractCtrl *p)
 548 {
 549     struct filter_info *tinfo = clientData;
 550
 551     odr_reset(tinfo->odr);
 552
 553     return extract_split(tinfo, p);
 554 }
 555
 556 static int ioread_ret(void *context, char *buffer, int len)
 557 {
 558     struct recRetrieveCtrl *p = context;
 559     return p->stream->readf(p->stream, buffer, len);
 560 }
 561
 562 static int ioclose_ret(void *context)
 563 {
 564     return 0;
 565 }
 566
 567 static const char *snippet_doc(struct recRetrieveCtrl *p, int text_mode,
 568                                int window_size)
 569 {
 570     const char *xml_doc_str;
 571     int ord = 0;
 572     WRBUF wrbuf = wrbuf_alloc();
 573     zebra_snippets *res =
 574         zebra_snippets_window(p->doc_snippet, p->hit_snippet, window_size);
 575     zebra_snippet_word *w = zebra_snippets_list(res);
 576
 577     if (text_mode)
 578         wrbuf_printf(wrbuf, "\'");
 579     else
 580         wrbuf_printf(wrbuf, "<snippet xmlns='%s'>\n", zebra_xslt_ns);
 581     for (; w; w = w->next)
 582     {
 583         if (ord == 0)
 584             ord = w->ord;
 585         else if (ord != w->ord)
 586
 587             break;
 588         if (text_mode)
 589             wrbuf_printf(wrbuf, "%s%s%s ",
 590                          w->match ? "*" : "",
 591                          w->term,
 592                          w->match ? "*" : "");
 593         else
 594         {
 595             wrbuf_printf(wrbuf, " <term ord='%d' seqno='" ZINT_FORMAT "' %s>",
 596                          w->ord, w->seqno,
 597                          (w->match ? "match='1'" : ""));
 598             wrbuf_xmlputs(wrbuf, w->term);
 599             wrbuf_printf(wrbuf, "</term>\n");
 600         }
 601     }
 602     if (text_mode)
 603         wrbuf_printf(wrbuf, "\'");
 604     else
 605         wrbuf_printf(wrbuf, "</snippet>\n");
 606
 607     xml_doc_str = odr_strdup(p->odr, wrbuf_buf(wrbuf));
 608
 609     zebra_snippets_destroy(res);
 610     wrbuf_free(wrbuf, 1);
 611     return xml_doc_str;
 612 }
 613
 614 static int filter_retrieve (void *clientData, struct recRetrieveCtrl *p)
 615 {
 616     /* const char *esn = zebra_xslt_ns; */
 617     const char *esn = 0;
 618     const char *params[32];
 619     struct filter_info *tinfo = clientData;
 620     xmlDocPtr resDoc;
 621     xmlDocPtr doc;
 622     struct filter_schema *schema;
 623     int window_size = -1;
 624
 625     if (p->comp)
 626     {
 627         if (p->comp->which == Z_RecordComp_simple
 628             && p->comp->u.simple->which == Z_ElementSetNames_generic)
 629         {
 630             esn = p->comp->u.simple->u.generic;
 631         }
 632         else if (p->comp->which == Z_RecordComp_complex
 633                  && p->comp->u.complex->generic->elementSpec
 634                  && p->comp->u.complex->generic->elementSpec->which ==
 635                  Z_ElementSpec_elementSetName)
 636         {
 637             esn = p->comp->u.complex->generic->elementSpec->u.elementSetName;
 638         }
 639     }
 640     schema = lookup_schema(tinfo, esn);
 641     if (!schema)
 642     {
 643         p->diagnostic =
 644             YAZ_BIB1_SPECIFIED_ELEMENT_SET_NAME_NOT_VALID_FOR_SPECIFIED_;
 645         return 0;
 646     }
 647
 648     if (schema->include_snippet)
 649         window_size = atoi(schema->include_snippet);
 650
 651     params[0] = 0;
 652     set_param_int(params, "id", p->localno, p->odr);
 653     if (p->fname)
 654         set_param_str(params, "filename", p->fname, p->odr);
 655     if (p->staticrank >= 0)
 656         set_param_int(params, "rank", p->staticrank, p->odr);
 657
 658     if (esn)
 659         set_param_str(params, "schema", esn, p->odr);
 660     else
 661         if (schema->name)
 662             set_param_str(params, "schema", schema->name, p->odr);
 663         else if (schema->identifier)
 664             set_param_str(params, "schema", schema->identifier, p->odr);
 665         else
 666             set_param_str(params, "schema", "", p->odr);
 667
 668     if (p->score >= 0)
 669         set_param_int(params, "score", p->score, p->odr);
 670     set_param_int(params, "size", p->recordSize, p->odr);
 671
 672     if (window_size >= 0)
 673         set_param_xml(params, "snippet", snippet_doc(p, 1, window_size),
 674                       p->odr);
 675     doc = xmlReadIO(ioread_ret, ioclose_ret, p /* I/O handler */,
 676                     0 /* URL */,
 677                     0 /* encoding */,
 678                     XML_PARSE_XINCLUDE);
 679     if (!doc)
 680     {
 681         p->diagnostic = YAZ_BIB1_SYSTEM_ERROR_IN_PRESENTING_RECORDS;
 682         return 0;
 683     }
 684
 685     if (window_size >= 0)
 686     {
 687         xmlNodePtr node = xmlDocGetRootElement(doc);
 688         const char *snippet_str = snippet_doc(p, 0, window_size);
 689         xmlDocPtr snippet_doc = xmlParseMemory(snippet_str, strlen(snippet_str));
 690         xmlAddChild(node, xmlDocGetRootElement(snippet_doc));
 691     }
 692     if (!schema->stylesheet_xsp)
 693         resDoc = doc;
 694     else
 695     {
 696         resDoc = xsltApplyStylesheet(schema->stylesheet_xsp,
 697                                      doc, params);
 698         xmlFreeDoc(doc);
 699     }
 700     if (!resDoc)
 701     {
 702         p->diagnostic = YAZ_BIB1_SYSTEM_ERROR_IN_PRESENTING_RECORDS;
 703     }
 704     else if (p->input_format == VAL_NONE || p->input_format == VAL_TEXT_XML)
 705     {
 706         xmlChar *buf_out;
 707         int len_out;
 708
 709         if (schema->stylesheet_xsp)
 710             xsltSaveResultToString(&buf_out, &len_out, resDoc,
 711                                    schema->stylesheet_xsp);
 712         else
 713             xmlDocDumpMemory(resDoc, &buf_out, &len_out);
 714
 715         p->output_format = VAL_TEXT_XML;
 716         p->rec_len = len_out;
 717         p->rec_buf = odr_malloc(p->odr, p->rec_len);
 718         memcpy(p->rec_buf, buf_out, p->rec_len);
 719         xmlFree(buf_out);
 720     }
 721     else if (p->output_format == VAL_SUTRS)
 722     {
 723         xmlChar *buf_out;
 724         int len_out;
 725
 726         if (schema->stylesheet_xsp)
 727             xsltSaveResultToString(&buf_out, &len_out, resDoc,
 728                                    schema->stylesheet_xsp);
 729         else
 730             xmlDocDumpMemory(resDoc, &buf_out, &len_out);
 731
 732         p->output_format = VAL_SUTRS;
 733         p->rec_len = len_out;
 734         p->rec_buf = odr_malloc(p->odr, p->rec_len);
 735         memcpy(p->rec_buf, buf_out, p->rec_len);
 736
 737         xmlFree(buf_out);
 738     }
 739     else
 740     {
 741         p->diagnostic = YAZ_BIB1_RECORD_SYNTAX_UNSUPP;
 742     }
 743     xmlFreeDoc(resDoc);
 744     return 0;
 745 }
 746
 747 static struct recType filter_type = {
 748     0,
 749     "alvis",
 750     filter_init,
 751     filter_config,
 752     filter_destroy,
 753     filter_extract,
 754     filter_retrieve
 755 };
 756
 757 RecType
 758 #ifdef IDZEBRA_STATIC_ALVIS
 759 idzebra_filter_alvis
 760 #else
 761 idzebra_filter
 762 #endif
 763
 764 [] = {
 765     &filter_type,
 766     0,
 767 };
 768 /*
 769  * Local variables:
 770  * c-basic-offset: 4
 771  * indent-tabs-mode: nil
 772  * End:
 773  * vim: shiftwidth=4 tabstop=8 expandtab
 774  */
 775