src/icu_transform.c

   1 /* This file is part of the YAZ toolkit.
   2  * Copyright (C) 1995-2010 Index Data
   3  * See the file LICENSE for details.
   4  */
   5
   6 /**
   7  * \file
   8  * \brief ICU transforms - using utrans_-functions from ICU
   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/log.h>
  21
  22 #include <assert.h>
  23 #include <string.h>
  24 #include <stdlib.h>
  25 #include <stdio.h>
  26
  27 #include <unicode/utrans.h>
  28
  29 struct icu_transform
  30 {
  31     char action;
  32     UParseError parse_error;
  33     UTransliterator * trans;
  34 };
  35
  36 struct icu_transform *icu_transform_clone(struct icu_transform *old)
  37 {
  38     struct icu_transform *transform
  39         = (struct icu_transform *) xmalloc(sizeof(struct icu_transform));
  40     UErrorCode status = U_ZERO_ERROR;
  41     assert(old);
  42     transform->action = old->action;
  43     assert(old->trans);
  44     transform->trans = utrans_clone(old->trans, &status);
  45     assert(transform->trans);
  46     return transform;
  47 }
  48
  49 struct icu_transform * icu_transform_create(const char *id, char action,
  50                                             const char *rules,
  51                                             UErrorCode *status)
  52 {
  53     struct icu_buf_utf16 *id16 = icu_buf_utf16_create(0);
  54     struct icu_buf_utf16 *rules16 = icu_buf_utf16_create(0);
  55
  56     struct icu_transform *transform
  57         = (struct icu_transform *) xmalloc(sizeof(struct icu_transform));
  58
  59     transform->action = action;
  60     transform->trans = 0;
  61
  62     if (id)
  63         icu_utf16_from_utf8_cstr(id16, id, status);
  64     if (rules)
  65         icu_utf16_from_utf8_cstr(rules16, rules, status);
  66
  67     switch (transform->action)
  68     {
  69     case 'f':
  70     case 'F':
  71         transform->trans
  72             = utrans_openU(id16->utf16,
  73                            id16->utf16_len,
  74                            UTRANS_FORWARD,
  75                            rules16->utf16,
  76                            rules16->utf16_len,
  77                            &transform->parse_error, status);
  78         break;
  79     case 'r':
  80     case 'R':
  81         transform->trans
  82             = utrans_openU(id16->utf16,
  83                            id16->utf16_len,
  84                            UTRANS_REVERSE ,
  85                            rules16->utf16,
  86                            rules16->utf16_len,
  87                            &transform->parse_error, status);
  88         break;
  89     default:
  90         *status = U_UNSUPPORTED_ERROR;
  91         break;
  92     }
  93     icu_buf_utf16_destroy(rules16);
  94     icu_buf_utf16_destroy(id16);
  95
  96     if (U_SUCCESS(*status))
  97         return transform;
  98
  99     /* freeing if failed */
 100     icu_transform_destroy(transform);
 101     return 0;
 102 }
 103
 104 void icu_transform_destroy(struct icu_transform * transform)
 105 {
 106     if (transform)
 107     {
 108         if (transform->trans)
 109             utrans_close(transform->trans);
 110         xfree(transform);
 111     }
 112 }
 113
 114 int icu_transform_trans(struct icu_transform * transform,
 115                         struct icu_buf_utf16 * dest16,
 116                         const struct icu_buf_utf16 * src16,
 117                         UErrorCode *status)
 118 {
 119     if (!transform || !transform->trans
 120         || !src16  || !dest16)
 121         return 0;
 122
 123     if (!src16->utf16_len)
 124     {           /* guarding for empty source string */
 125         icu_buf_utf16_clear(dest16);
 126         return 0;
 127     }
 128
 129     if (!icu_buf_utf16_copy(dest16, src16))
 130         return 0;
 131
 132     utrans_transUChars (transform->trans,
 133                         dest16->utf16, &(dest16->utf16_len),
 134                         dest16->utf16_cap,
 135                         0, &(dest16->utf16_len), status);
 136
 137     if (U_FAILURE(*status))
 138         icu_buf_utf16_clear(dest16);
 139
 140     return dest16->utf16_len;
 141 }
 142
 143
 144 #endif /* YAZ_HAVE_ICU */
 145
 146 /*
 147  * Local variables:
 148  * c-basic-offset: 4
 149  * c-file-style: "Stroustrup"
 150  * indent-tabs-mode: nil
 151  * End:
 152  * vim: shiftwidth=4 tabstop=8 expandtab
 153  */
 154