src/icu_chain.c

   1 /* This file is part of the YAZ toolkit.
   2  * Copyright (C) 1995-2013 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             no_errors++;
 350             break;
 351         }
 352     }
 353     nmem_destroy(nmem);
 354     if (no_errors)
 355     {
 356         icu_chain_destroy(chain);
 357         return 0;
 358     }
 359     return chain;
 360 }
 361
 362 struct icu_iter {
 363     struct icu_chain *chain;
 364     struct icu_buf_utf16 *last;
 365     UErrorCode status;
 366     struct icu_buf_utf8 *display;
 367     struct icu_buf_utf8 *sort8;
 368     struct icu_buf_utf8 *result;
 369     struct icu_buf_utf16 *input;
 370     int token_count;
 371     struct icu_chain_step *steps;
 372 };
 373
 374 void icu_utf16_print(struct icu_buf_utf16 *src16)
 375 {
 376     UErrorCode status = U_ZERO_ERROR;
 377     const char *p;
 378     struct icu_buf_utf8 *dst8 = icu_buf_utf8_create(0);
 379     icu_utf16_to_utf8(dst8, src16, &status);
 380
 381     if (U_FAILURE(status))
 382     {
 383         printf("failure");
 384     }
 385     else
 386     {
 387         p = icu_buf_utf8_to_cstr(dst8);
 388         printf("%s", p);
 389     }
 390     icu_buf_utf8_destroy(dst8);
 391 }
 392
 393 struct icu_buf_utf16 *icu_iter_invoke(yaz_icu_iter_t iter,
 394                                       struct icu_chain_step *step,
 395                                       struct icu_buf_utf16 *src)
 396 {
 397     if (!step)
 398         return src;
 399     else
 400     {
 401         struct icu_buf_utf16 *dst = icu_iter_invoke(iter, step->previous, src);
 402
 403         switch (step->type)
 404         {
 405         case ICU_chain_step_type_casemap:
 406             if (dst)
 407             {
 408                 struct icu_buf_utf16 *src = dst;
 409
 410                 dst = icu_buf_utf16_create(0);
 411                 icu_casemap_casemap(step->u.casemap, dst, src, &iter->status,
 412                                     iter->chain->locale);
 413                 icu_buf_utf16_destroy(src);
 414             }
 415             break;
 416         case ICU_chain_step_type_tokenize:
 417             if (dst)
 418             {
 419                 struct icu_buf_utf16 *src = dst;
 420
 421                 icu_tokenizer_attach(step->u.tokenizer, src, &iter->status);
 422                 icu_buf_utf16_destroy(src);
 423             }
 424             dst = icu_buf_utf16_create(0);
 425             iter->status = U_ZERO_ERROR;
 426             if (!icu_tokenizer_next_token(step->u.tokenizer, dst, &iter->status))
 427             {
 428                 icu_buf_utf16_destroy(dst);
 429                 dst = 0;
 430             }
 431             break;
 432         case ICU_chain_step_type_transform:
 433         case ICU_chain_step_type_transliterate:
 434             if (dst)
 435             {
 436                 struct icu_buf_utf16 *src = dst;
 437                 dst = icu_buf_utf16_create(0);
 438                 icu_transform_trans(step->u.transform, dst, src, &iter->status);
 439                 icu_buf_utf16_destroy(src);
 440             }
 441             break;
 442         case ICU_chain_step_type_display:
 443             if (dst)
 444                 icu_utf16_to_utf8(iter->display, dst, &iter->status);
 445             break;
 446         case YAZ_chain_step_type_stemming:
 447             if (dst)
 448             {
 449                 struct icu_buf_utf16 *src = dst;
 450                 dst = icu_buf_utf16_create(0);
 451                 yaz_stemmer_stem(step->u.stemmer, dst, src, &iter->status);
 452                 icu_buf_utf16_destroy(src);
 453             }
 454             break;
 455         case ICU_chain_step_type_join:
 456             if (dst)
 457             {
 458                 while (1)
 459                 {
 460                     struct icu_buf_utf16 *dst1 =
 461                         icu_iter_invoke(iter, step->previous, 0);
 462
 463                     if (!dst1)
 464                         break;
 465                     dst = icu_buf_utf16_append(dst, step->u.join);
 466                     dst = icu_buf_utf16_append(dst, dst1);
 467                     icu_buf_utf16_destroy(dst1);
 468                 }
 469             }
 470             break;
 471         default:
 472             assert(0);
 473         }
 474         return dst;
 475     }
 476 }
 477
 478 yaz_icu_iter_t icu_iter_create(struct icu_chain *chain)
 479 {
 480     yaz_icu_iter_t iter = xmalloc(sizeof(*iter));
 481     iter->chain = chain;
 482     iter->status = U_ZERO_ERROR;
 483     iter->display = icu_buf_utf8_create(0);
 484     iter->sort8 = icu_buf_utf8_create(0);
 485     iter->result = icu_buf_utf8_create(0);
 486     iter->last = 0; /* no last returned string (yet) */
 487     iter->steps = icu_chain_step_clone(chain->csteps);
 488     iter->input = 0;
 489
 490     return iter;
 491 }
 492
 493 void icu_iter_first(yaz_icu_iter_t iter, const char *src8cstr)
 494 {
 495     if (iter->input)
 496         icu_buf_utf16_destroy(iter->input);
 497     iter->input = icu_buf_utf16_create(0);
 498     iter->token_count = 0;
 499     /* fill and assign input string.. It will be 0 after
 500        first iteration */
 501     icu_utf16_from_utf8_cstr(iter->input, src8cstr, &iter->status);
 502 }
 503
 504 void icu_iter_destroy(yaz_icu_iter_t iter)
 505 {
 506     if (iter)
 507     {
 508         icu_buf_utf8_destroy(iter->display);
 509         icu_buf_utf8_destroy(iter->sort8);
 510         icu_buf_utf8_destroy(iter->result);
 511         if (iter->input)
 512             icu_buf_utf16_destroy(iter->input);
 513         icu_chain_step_destroy(iter->steps);
 514         xfree(iter);
 515     }
 516 }
 517
 518 int icu_iter_next(yaz_icu_iter_t iter)
 519 {
 520     if (!iter->input && iter->last == 0)
 521         return 0;
 522     else
 523     {
 524         /* on first call, iter->input is the input string. Thereafter: 0. */
 525         assert(iter->steps || !iter->chain->csteps);
 526         iter->last = icu_iter_invoke(iter, iter->steps, iter->input);
 527         iter->input = 0;
 528
 529         if (!iter->last)
 530             return 0;
 531
 532         iter->token_count++;
 533
 534         if (iter->chain->sort)
 535         {
 536             icu_sortkey8_from_utf16(iter->chain->coll,
 537                                     iter->sort8, iter->last,
 538                                     &iter->status);
 539         }
 540         icu_utf16_to_utf8(iter->result, iter->last, &iter->status);
 541         icu_buf_utf16_destroy(iter->last);
 542
 543         return 1;
 544     }
 545 }
 546
 547 const char *icu_iter_get_norm(yaz_icu_iter_t iter)
 548 {
 549     return icu_buf_utf8_to_cstr(iter->result);
 550 }
 551
 552 const char *icu_iter_get_sortkey(yaz_icu_iter_t iter)
 553 {
 554     return icu_buf_utf8_to_cstr(iter->sort8);
 555 }
 556
 557 const char *icu_iter_get_display(yaz_icu_iter_t iter)
 558 {
 559     return icu_buf_utf8_to_cstr(iter->display);
 560 }
 561
 562 int icu_iter_get_token_number(yaz_icu_iter_t iter)
 563 {
 564     return iter->token_count;
 565 }
 566
 567 int icu_chain_assign_cstr(struct icu_chain *chain, const char *src8cstr,
 568                           UErrorCode *status)
 569 {
 570     if (chain->iter)
 571         icu_iter_destroy(chain->iter);
 572     chain->iter = icu_iter_create(chain);
 573     icu_iter_first(chain->iter, src8cstr);
 574     return 1;
 575 }
 576
 577 int icu_chain_next_token(struct icu_chain *chain, UErrorCode *status)
 578 {
 579     *status = U_ZERO_ERROR;
 580     return icu_iter_next(chain->iter);
 581 }
 582
 583 int icu_chain_token_number(struct icu_chain *chain)
 584 {
 585     if (chain && chain->iter)
 586         return chain->iter->token_count;
 587     return 0;
 588 }
 589
 590 const char *icu_chain_token_display(struct icu_chain *chain)
 591 {
 592     if (chain->iter)
 593         return icu_iter_get_display(chain->iter);
 594     return 0;
 595 }
 596
 597 const char *icu_chain_token_norm(struct icu_chain *chain)
 598 {
 599     if (chain->iter)
 600         return icu_iter_get_norm(chain->iter);
 601     return 0;
 602 }
 603
 604 const char *icu_chain_token_sortkey(struct icu_chain *chain)
 605 {
 606     if (chain->iter)
 607         return icu_iter_get_sortkey(chain->iter);
 608     return 0;
 609 }
 610
 611 #endif /* YAZ_HAVE_ICU */
 612
 613 /*
 614  * Local variables:
 615  * c-basic-offset: 4
 616  * c-file-style: "Stroustrup"
 617  * indent-tabs-mode: nil
 618  * End:
 619  * vim: shiftwidth=4 tabstop=8 expandtab
 620  */
 621