src/icu_chain.c

   1 /* This file is part of the YAZ toolkit.
   2  * Copyright (C) Index Data
   3  * See the file LICENSE for details.
   4  */
   5
   6 /**
   7  * \file
   8  * \brief ICU chain
   9  */
  10
  11 #if HAVE_CONFIG_H
  12 #include "config.h"
  13 #endif
  14
  15 #if YAZ_HAVE_ICU
  16 #include <yaz/xmalloc.h>
  17
  18 #include <yaz/icu_I18N.h>
  19
  20 #include <yaz/stemmer.h>
  21
  22 #include <yaz/log.h>
  23 #include <yaz/nmem.h>
  24 #include <yaz/nmem_xml.h>
  25 #include <string.h>
  26 #include <stdlib.h>
  27 #include <stdio.h>
  28 #include <assert.h>
  29
  30 #include <unicode/ustring.h>  /* some more string fcns*/
  31 #include <unicode/uchar.h>    /* char names           */
  32
  33 enum icu_chain_step_type {
  34     ICU_chain_step_type_none,
  35     ICU_chain_step_type_display,        /* convert to utf8 display format */
  36     ICU_chain_step_type_casemap,        /* apply utf16 charmap */
  37     ICU_chain_step_type_transform,      /* apply utf16 transform */
  38     ICU_chain_step_type_tokenize,       /* apply utf16 tokenization */
  39     ICU_chain_step_type_transliterate,  /* apply utf16 tokenization */
  40     YAZ_chain_step_type_stemming,       /* apply utf16 stemming (YAZ) */
  41     ICU_chain_step_type_join
  42 };
  43
  44 struct icu_chain_step
  45 {
  46     /* type and action object */
  47     enum icu_chain_step_type type;
  48     union {
  49         struct icu_casemap   *casemap;
  50         struct icu_transform *transform;
  51         struct icu_tokenizer *tokenizer;
  52         yaz_stemmer_p         stemmer;
  53         struct icu_buf_utf16 *join;
  54     } u;
  55     struct icu_chain_step *previous;
  56 };
  57
  58 struct icu_chain
  59 {
  60     yaz_icu_iter_t iter;
  61     char *locale;
  62     int sort;
  63
  64     UCollator *coll;
  65
  66     /* linked list of chain steps */
  67     struct icu_chain_step *csteps;
  68 };
  69
  70 int icu_check_status(UErrorCode status)
  71 {
  72     if (U_FAILURE(status))
  73     {
  74         yaz_log(YLOG_WARN, "ICU: %d %s\n", status, u_errorName(status));
  75         return 0;
  76     }
  77     return 1;
  78 }
  79
  80 static struct icu_chain_step *icu_chain_insert_step(
  81     struct icu_chain *chain, enum icu_chain_step_type type,
  82     const char *rule, UErrorCode *status)
  83 {
  84     struct icu_chain_step *step = 0;
  85
  86     assert(chain);
  87     assert(type);
  88
  89     step = (struct icu_chain_step *) xmalloc(sizeof(*step));
  90     step->type = type;
  91
  92     switch (step->type)
  93     {
  94     case ICU_chain_step_type_display:
  95         break;
  96     case ICU_chain_step_type_casemap:
  97         assert(rule);
  98         step->u.casemap = icu_casemap_create(rule[0], status);
  99         break;
 100     case ICU_chain_step_type_transform:
 101         assert(rule);
 102         /* rule omitted. Only ID used */
 103         step->u.transform = icu_transform_create(rule, 'f', 0, status);
 104         break;
 105     case ICU_chain_step_type_tokenize:
 106         assert(rule);
 107         step->u.tokenizer = icu_tokenizer_create(chain->locale, rule[0], status);
 108         break;
 109     case ICU_chain_step_type_transliterate:
 110         assert(rule);
 111         /* we pass a dummy ID to utrans_openU.. */
 112         step->u.transform = icu_transform_create("custom", 'f', rule, status);
 113         break;
 114     case YAZ_chain_step_type_stemming:
 115         assert(rule);
 116         step->u.stemmer = yaz_stemmer_create(chain->locale, rule, status);
 117         break;
 118     case ICU_chain_step_type_join:
 119         assert(rule);
 120         step->u.join = icu_buf_utf16_create(0);
 121         icu_utf16_from_utf8_cstr(step->u.join, rule, status);
 122         break;
 123     default:
 124         break;
 125     }
 126     step->previous = chain->csteps;
 127     chain->csteps = step;
 128
 129     return step;
 130 }
 131
 132
 133 static void icu_chain_step_destroy(struct icu_chain_step *step)
 134 {
 135     if (!step)
 136         return;
 137
 138     icu_chain_step_destroy(step->previous);
 139
 140     switch (step->type)
 141     {
 142     case ICU_chain_step_type_display:
 143         break;
 144     case ICU_chain_step_type_casemap:
 145         icu_casemap_destroy(step->u.casemap);
 146         break;
 147     case ICU_chain_step_type_transform:
 148     case ICU_chain_step_type_transliterate:
 149         icu_transform_destroy(step->u.transform);
 150         break;
 151     case ICU_chain_step_type_tokenize:
 152         icu_tokenizer_destroy(step->u.tokenizer);
 153         break;
 154     case YAZ_chain_step_type_stemming:
 155         yaz_stemmer_destroy(step->u.stemmer);
 156         break;
 157     case ICU_chain_step_type_join:
 158         icu_buf_utf16_destroy(step->u.join);
 159         break;
 160     default:
 161         break;
 162     }
 163     xfree(step);
 164 }
 165
 166 struct icu_chain_step *icu_chain_step_clone(struct icu_chain_step *old)
 167 {
 168     struct icu_chain_step *step = 0;
 169     struct icu_chain_step **sp = &step;
 170     while (old)
 171     {
 172         *sp = (struct icu_chain_step *) xmalloc(sizeof(**sp));
 173         (*sp)->type = old->type;
 174
 175         switch ((*sp)->type)
 176         {
 177         case ICU_chain_step_type_display:
 178             break;
 179         case ICU_chain_step_type_casemap:
 180             (*sp)->u.casemap = icu_casemap_clone(old->u.casemap);
 181             break;
 182         case ICU_chain_step_type_transform:
 183         case ICU_chain_step_type_transliterate:
 184             (*sp)->u.transform = icu_transform_clone(old->u.transform);
 185             break;
 186         case ICU_chain_step_type_tokenize:
 187             (*sp)->u.tokenizer = icu_tokenizer_clone(old->u.tokenizer);
 188             break;
 189         case YAZ_chain_step_type_stemming:
 190             (*sp)->u.stemmer = yaz_stemmer_clone(old->u.stemmer);
 191             break;
 192         case ICU_chain_step_type_none:
 193             break;
 194         case ICU_chain_step_type_join:
 195             (*sp)->u.join = icu_buf_utf16_create(0);
 196             (*sp)->u.join = icu_buf_utf16_copy((*sp)->u.join, old->u.join);
 197             break;
 198         }
 199         old = old->previous;
 200         sp = &(*sp)->previous;
 201     }
 202     *sp = 0;
 203     return step;
 204 }
 205
 206 struct icu_chain *icu_chain_create(const char *locale, int sort,
 207                                    UErrorCode *status)
 208 {
 209     struct icu_chain *chain;
 210     UCollator *coll = ucol_open(locale, status);
 211
 212     if (U_FAILURE(*status))
 213         return 0;
 214
 215     chain = (struct icu_chain *) xmalloc(sizeof(*chain));
 216     chain->iter = 0;
 217     chain->locale = xstrdup(locale);
 218     chain->sort = sort;
 219     chain->coll = coll;
 220     chain->csteps = 0;
 221
 222     return chain;
 223 }
 224
 225 void icu_chain_destroy(struct icu_chain *chain)
 226 {
 227     if (chain)
 228     {
 229         if (chain->coll)
 230             ucol_close(chain->coll);
 231
 232         if (chain->iter)
 233             icu_iter_destroy(chain->iter);
 234         icu_chain_step_destroy(chain->csteps);
 235         xfree(chain->locale);
 236         xfree(chain);
 237     }
 238 }
 239
 240 struct icu_chain *icu_chain_xml_config(const xmlNode *xml_node,
 241                                        int sort,
 242                                        UErrorCode *status)
 243 {
 244     xmlNode *node = 0;
 245     int no_errors = 0;
 246     struct icu_chain *chain = 0;
 247     NMEM nmem = 0;
 248
 249     *status = U_ZERO_ERROR;
 250
 251     if (xml_node && xml_node->type == XML_ELEMENT_NODE)
 252     {
 253         xmlChar *xml_locale = xmlGetProp((xmlNode *) xml_node,
 254                                          (xmlChar *) "locale");
 255         if (xml_locale)
 256         {
 257             chain = icu_chain_create((const char *) xml_locale, sort, status);
 258             xmlFree(xml_locale);
 259         }
 260     }
 261
 262     if (!chain)
 263         return 0;
 264
 265     nmem = nmem_create();
 266     for (node = xml_node->children; node; node = node->next)
 267     {
 268         char *rule = 0;
 269         struct icu_chain_step *step = 0;
 270         struct _xmlAttr *attr;
 271
 272         nmem_reset(nmem);
 273         if (node->type != XML_ELEMENT_NODE)
 274             continue;
 275
 276         for (attr = node->properties; attr; attr = attr->next)
 277         {
 278             if (!strcmp((const char *) attr->name, "rule"))
 279             {
 280                 rule = nmem_text_node_cdata(attr->children, nmem);
 281             }
 282             else
 283             {
 284                 yaz_log(YLOG_WARN, "Unsupported attribute '%s' for "
 285                         "element '%s'", attr->name, node->name);
 286                 no_errors++;
 287             }
 288         }
 289         if (!rule && node->children)
 290             rule = nmem_text_node_cdata(node->children, nmem);
 291
 292         if (!rule && strcmp((const char *) node->name, "display"))
 293         {
 294             yaz_log(YLOG_WARN, "Missing attribute 'rule' for element %s",
 295                     (const char *) node->name);
 296             no_errors++;
 297             continue;
 298         }
 299         if (!strcmp((const char *) node->name, "casemap"))
 300             step = icu_chain_insert_step(chain,
 301                                          ICU_chain_step_type_casemap,
 302                                          rule, status);
 303         else if (!strcmp((const char *) node->name, "transform"))
 304             step = icu_chain_insert_step(chain,
 305                                          ICU_chain_step_type_transform,
 306                                          rule, status);
 307         else if (!strcmp((const char *) node->name, "transliterate"))
 308             step = icu_chain_insert_step(chain,
 309                                          ICU_chain_step_type_transliterate,
 310                                          rule, status);
 311         else if (!strcmp((const char *) node->name, "tokenize"))
 312             step = icu_chain_insert_step(chain, ICU_chain_step_type_tokenize,
 313                                          rule, status);
 314         else if (!strcmp((const char *) node->name, "display"))
 315             step = icu_chain_insert_step(chain, ICU_chain_step_type_display,
 316                                          rule, status);
 317         else if (!strcmp((const char *) node->name, "stemming"))
 318             step = icu_chain_insert_step(chain, YAZ_chain_step_type_stemming,
 319                                          rule, status);
 320         else if (!strcmp((const char *) node->name, "join"))
 321             step = icu_chain_insert_step(chain, ICU_chain_step_type_join,
 322                                          rule, status);
 323         else if (!strcmp((const char *) node->name, "normalize"))
 324         {
 325             yaz_log(YLOG_WARN, "Element %s is deprecated. "
 326                     "Use transform instead", node->name);
 327             step = icu_chain_insert_step(chain, ICU_chain_step_type_transform,
 328                                          rule, status);
 329         }
 330         else if (!strcmp((const char *) node->name, "index")
 331                  || !strcmp((const char *) node->name, "sortkey"))
 332         {
 333             yaz_log(YLOG_WARN, "Element %s is no longer needed. "
 334                     "Remove it from the configuration", node->name);
 335         }
 336         else
 337         {
 338             yaz_log(YLOG_WARN, "Unknown element %s", node->name);
 339             no_errors++;
 340             continue;
 341         }
 342         if (!step)
 343         {
 344             yaz_log(YLOG_WARN, "Step not created for %s", node->name);
 345             no_errors++;
 346         }
 347         if (step && U_FAILURE(*status))
 348         {
 349             yaz_log(YLOG_WARN, "ICU Error %d %s for element %s, rule %s",
 350                     *status, u_errorName(*status), node->name, rule ?
 351                     rule : "");
 352             no_errors++;
 353             break;
 354         }
 355     }
 356     nmem_destroy(nmem);
 357     if (no_errors)
 358     {
 359         icu_chain_destroy(chain);
 360         return 0;
 361     }
 362     return chain;
 363 }
 364
 365 struct icu_iter {
 366     struct icu_chain *chain;
 367     struct icu_buf_utf16 *last;
 368     struct icu_buf_utf16 *org;
 369     UErrorCode status;
 370     struct icu_buf_utf8 *display;
 371     struct icu_buf_utf8 *sort8;
 372     struct icu_buf_utf8 *result;
 373     int token_count;
 374     size_t org_start;
 375     size_t org_len;
 376     struct icu_chain_step *steps;
 377 };
 378
 379 void icu_utf16_print(struct icu_buf_utf16 *src16)
 380 {
 381     UErrorCode status = U_ZERO_ERROR;
 382     const char *p;
 383     struct icu_buf_utf8 *dst8 = icu_buf_utf8_create(0);
 384     icu_utf16_to_utf8(dst8, src16, &status);
 385
 386     if (U_FAILURE(status))
 387     {
 388         printf("failure");
 389     }
 390     else
 391     {
 392         p = icu_buf_utf8_to_cstr(dst8);
 393         printf("%s", p);
 394     }
 395     icu_buf_utf8_destroy(dst8);
 396 }
 397
 398 struct icu_buf_utf16 *icu_iter_invoke(yaz_icu_iter_t iter,
 399                                       struct icu_chain_step *step,
 400                                       struct icu_buf_utf16 *src)
 401 {
 402     if (!step)
 403         return src;
 404     else
 405     {
 406         struct icu_buf_utf16 *dst = icu_iter_invoke(iter, step->previous, src);
 407
 408         switch (step->type)
 409         {
 410         case ICU_chain_step_type_casemap:
 411             if (dst)
 412             {
 413                 struct icu_buf_utf16 *src = dst;
 414
 415                 dst = icu_buf_utf16_create(0);
 416                 icu_casemap_casemap(step->u.casemap, dst, src, &iter->status,
 417                                     iter->chain->locale);
 418                 icu_buf_utf16_destroy(src);
 419             }
 420             break;
 421         case ICU_chain_step_type_tokenize:
 422             if (dst)
 423             {
 424                 struct icu_buf_utf16 *src = dst;
 425
 426                 icu_tokenizer_attach(step->u.tokenizer, src, &iter->status);
 427                 icu_buf_utf16_destroy(src);
 428             }
 429             dst = icu_buf_utf16_create(0);
 430             iter->status = U_ZERO_ERROR;
 431             if (!icu_tokenizer_next_token(step->u.tokenizer, dst, &iter->status,
 432                                           &iter->org_start, &iter->org_len))
 433             {
 434                 icu_buf_utf16_destroy(dst);
 435                 dst = 0;
 436             }
 437             break;
 438         case ICU_chain_step_type_transform:
 439         case ICU_chain_step_type_transliterate:
 440             if (dst)
 441             {
 442                 struct icu_buf_utf16 *src = dst;
 443                 dst = icu_buf_utf16_create(0);
 444                 icu_transform_trans(step->u.transform, dst, src, &iter->status);
 445                 icu_buf_utf16_destroy(src);
 446             }
 447             break;
 448         case ICU_chain_step_type_display:
 449             if (dst)
 450                 icu_utf16_to_utf8(iter->display, dst, &iter->status);
 451             break;
 452         case YAZ_chain_step_type_stemming:
 453             if (dst)
 454             {
 455                 struct icu_buf_utf16 *src = dst;
 456                 dst = icu_buf_utf16_create(0);
 457                 yaz_stemmer_stem(step->u.stemmer, dst, src, &iter->status);
 458                 icu_buf_utf16_destroy(src);
 459             }
 460             break;
 461         case ICU_chain_step_type_join:
 462             if (dst)
 463             {
 464                 while (1)
 465                 {
 466                     struct icu_buf_utf16 *dst1 =
 467                         icu_iter_invoke(iter, step->previous, 0);
 468
 469                     if (!dst1)
 470                         break;
 471                     dst = icu_buf_utf16_append(dst, step->u.join);
 472                     dst = icu_buf_utf16_append(dst, dst1);
 473                     icu_buf_utf16_destroy(dst1);
 474                 }
 475             }
 476             break;
 477         default:
 478             assert(0);
 479         }
 480         return dst;
 481     }
 482 }
 483
 484 yaz_icu_iter_t icu_iter_create(struct icu_chain *chain)
 485 {
 486     yaz_icu_iter_t iter = xmalloc(sizeof(*iter));
 487     iter->chain = chain;
 488     iter->status = U_ZERO_ERROR;
 489     iter->display = icu_buf_utf8_create(0);
 490     iter->sort8 = icu_buf_utf8_create(0);
 491     iter->result = icu_buf_utf8_create(0);
 492     iter->org = icu_buf_utf16_create(0);
 493     iter->last = 0; /* no last returned string (yet) */
 494     iter->steps = icu_chain_step_clone(chain->csteps);
 495     iter->token_count = 0;
 496
 497     return iter;
 498 }
 499
 500 void icu_iter_first(yaz_icu_iter_t iter, const char *src8cstr)
 501 {
 502     struct icu_buf_utf16 *src = icu_buf_utf16_create(0);
 503     icu_utf16_from_utf8_cstr(src, src8cstr, &iter->status);
 504     icu_buf_utf16_copy(iter->org, src);
 505     iter->token_count = 0;
 506     iter->org_start = 0;
 507     iter->org_len = src->utf16_len;
 508     iter->last = icu_iter_invoke(iter, iter->steps, src);
 509 }
 510
 511 void icu_iter_destroy(yaz_icu_iter_t iter)
 512 {
 513     if (iter)
 514     {
 515         icu_buf_utf8_destroy(iter->display);
 516         icu_buf_utf8_destroy(iter->sort8);
 517         icu_buf_utf8_destroy(iter->result);
 518         icu_buf_utf16_destroy(iter->org);
 519         icu_chain_step_destroy(iter->steps);
 520         xfree(iter);
 521     }
 522 }
 523
 524 int icu_iter_next(yaz_icu_iter_t iter)
 525 {
 526     if (iter->token_count && iter->last)
 527         iter->last = icu_iter_invoke(iter, iter->steps, 0);
 528     if (!iter->last)
 529         return 0;
 530     else
 531     {
 532         iter->token_count++;
 533         if (iter->chain->sort)
 534         {
 535             icu_sortkey8_from_utf16(iter->chain->coll,
 536                                     iter->sort8, iter->last,
 537                                     &iter->status);
 538         }
 539         icu_utf16_to_utf8(iter->result, iter->last, &iter->status);
 540         icu_buf_utf16_destroy(iter->last);
 541
 542         return 1;
 543     }
 544 }
 545
 546 const char *icu_iter_get_norm(yaz_icu_iter_t iter)
 547 {
 548     return icu_buf_utf8_to_cstr(iter->result);
 549 }
 550
 551 const char *icu_iter_get_sortkey(yaz_icu_iter_t iter)
 552 {
 553     return icu_buf_utf8_to_cstr(iter->sort8);
 554 }
 555
 556 const char *icu_iter_get_display(yaz_icu_iter_t iter)
 557 {
 558     return icu_buf_utf8_to_cstr(iter->display);
 559 }
 560
 561 int icu_iter_get_token_number(yaz_icu_iter_t iter)
 562 {
 563     return iter->token_count;
 564 }
 565
 566
 567 void icu_iter_get_org_info(yaz_icu_iter_t iter, size_t *start, size_t *len)
 568 {
 569     /* save full length of org since we're gonna cut it */
 570     int32_t save_len = iter->org->utf16_len;
 571
 572     struct icu_buf_utf8 *tmp = icu_buf_utf8_create(0);
 573     UErrorCode status = U_ZERO_ERROR;
 574
 575     iter->org->utf16_len = iter->org_start;
 576     icu_utf16_to_utf8(tmp, iter->org, &status);
 577     if (U_SUCCESS(status))
 578         *start = tmp->utf8_len;
 579     else
 580         *start = 0;
 581     iter->org->utf16_len = iter->org_start + iter->org_len;
 582     icu_utf16_to_utf8(tmp, iter->org, &status);
 583     if (U_SUCCESS(status))
 584         *len = tmp->utf8_len - *start;
 585     else
 586         *len = 0;
 587     icu_buf_utf8_destroy(tmp);
 588     iter->org->utf16_len = save_len;
 589 }
 590
 591 int icu_chain_assign_cstr(struct icu_chain *chain, const char *src8cstr,
 592                           UErrorCode *status)
 593 {
 594     if (chain->iter)
 595         icu_iter_destroy(chain->iter);
 596     chain->iter = icu_iter_create(chain);
 597     icu_iter_first(chain->iter, src8cstr);
 598     return 1;
 599 }
 600
 601 int icu_chain_next_token(struct icu_chain *chain, UErrorCode *status)
 602 {
 603     *status = U_ZERO_ERROR;
 604     return icu_iter_next(chain->iter);
 605 }
 606
 607 int icu_chain_token_number(struct icu_chain *chain)
 608 {
 609     if (chain && chain->iter)
 610         return chain->iter->token_count;
 611     return 0;
 612 }
 613
 614 const char *icu_chain_token_display(struct icu_chain *chain)
 615 {
 616     if (chain->iter)
 617         return icu_iter_get_display(chain->iter);
 618     return 0;
 619 }
 620
 621 const char *icu_chain_token_norm(struct icu_chain *chain)
 622 {
 623     if (chain->iter)
 624         return icu_iter_get_norm(chain->iter);
 625     return 0;
 626 }
 627
 628 const char *icu_chain_token_sortkey(struct icu_chain *chain)
 629 {
 630     if (chain->iter)
 631         return icu_iter_get_sortkey(chain->iter);
 632     return 0;
 633 }
 634
 635 void icu_chain_get_org_info(struct icu_chain *chain, size_t *start, size_t *len)
 636 {
 637     if (chain->iter)
 638         icu_iter_get_org_info(chain->iter, start, len);
 639 }
 640
 641
 642 #endif /* YAZ_HAVE_ICU */
 643
 644 /*
 645  * Local variables:
 646  * c-basic-offset: 4
 647  * c-file-style: "Stroustrup"
 648  * indent-tabs-mode: nil
 649  * End:
 650  * vim: shiftwidth=4 tabstop=8 expandtab
 651  */
 652