efl/src/lib/evas/canvas/evas_textblock_hyphenation.x

#ifndef EVAS_TEXTBLOCK_HYPHENATION_H
#define EVAS_TEXTBLOCK_HYPHENATION_H
#ifdef HAVE_HYPHEN
#include <hyphen.h>

typedef struct
{
   const char *lang;
   HyphenDict *dict;
} Dict_Hyphen;

/* Hyphenation dictionaries */
static Dict_Hyphen _dicts_hyphen[64];
static size_t     _hyphens_num = 0;
static size_t     _hyphen_clients = 0;

static void
_dicts_hyphen_init(Eo *eo_obj)
{
   Efl_Canvas_Textblock_Data *o = efl_data_scope_get(eo_obj, MY_CLASS);

   if (!o->hyphenating)
     {
        _hyphen_clients++;
        o->hyphenating = EINA_TRUE;
     }
}

static HyphenDict *
_dict_hyphen_load(const char *lang)
{
   Eina_Iterator *it = NULL;
   Eina_File_Direct_Info *dir;
   HyphenDict *dict = NULL;
   const char *env_dir = getenv("EVAS_DICTS_HYPHEN_DIR");

   if (env_dir && strlen(env_dir) > 0)
     it = eina_file_direct_ls(env_dir);

   if (!it) it = eina_file_direct_ls(EVAS_DICTS_HYPHEN_DIR);

   if (!it)
     {
        ERR("Couldn't list files in hyphens path: %s\n", EVAS_DICTS_HYPHEN_DIR);
        return NULL;
     }

   /* The following is based on how files are installed in arch linux:
    * the files are in the pattern of "hyph_xx_XX.dic" (e.g. hyph_en_US.dic).
    * We are actually trying a bit more in case these are installed in another
    * name. We assume that they probably end in "xx_XX.dic" anyway. */
   EINA_ITERATOR_FOREACH(it, dir)
     {
        const char *file = dir->path + dir->name_start;
        char *prefix_off; /* 'hyph_' prefix (may be in some distros) */
        char *dic_off; /* '.dic' file extension offset */

        /* Check a few assumptions and reject if aren't met. */
        prefix_off = strstr(file, "hyph_");
        dic_off = strrchr(file, '.');
        if (!dic_off || ((size_t) (dic_off - file) + 4 != dir->name_length) ||
            (dic_off - file < 5)  ||
            ((dic_off - file > 0) && !prefix_off) ||
            strncmp(dic_off, ".dic", 4) || strncmp((dic_off - 5), lang, strlen(lang)))
          {
             continue;
          }

        dict = hnj_hyphen_load(dir->path);
        if (!dict)
          {
             ERR("Couldn't load hyphen dictionary: %s\n", dic_off - 5);
             continue;
          }
        _dicts_hyphen[_hyphens_num].lang = eina_strndup(dic_off - 5, 5);
        _dicts_hyphen[_hyphens_num++].dict = dict;
        break;
     }

   if (it) eina_iterator_free(it);

   return dict;
}

static void
_dicts_hyphen_free(void)
{
   if (_hyphens_num == 0) return;

   for (size_t i = 0; i < _hyphens_num; i++)
     {
        hnj_hyphen_free(_dicts_hyphen[i].dict);
     }

   _hyphens_num = 0;
}

static inline void
_dicts_hyphen_detach(Eo *eo_obj)
{
   Efl_Canvas_Textblock_Data *o = efl_data_scope_get(eo_obj, MY_CLASS);

   if (!o->hyphenating) return;
   o->hyphenating = EINA_FALSE;
   _hyphen_clients--;
   if (_hyphen_clients == 0) _dicts_hyphen_free();
}

/* Returns the hyphen dictionary that matches the given language
 * string. The string should be in the format xx_XX e.g. en_US */
static inline HyphenDict *
_hyphen_dict_get_from_lang(const char *lang)
{
   if (!lang || !(*lang))
     {
        if (!lang) lang = evas_common_language_from_locale_full_get();
        if (!lang || !(*lang)) return NULL;
     }

   for (size_t i = 0; i < _hyphens_num; i++)
     {
        if (!strcmp(_dicts_hyphen[i].lang, lang))
          {
             return _dicts_hyphen[i].dict;
          }
     }

   return _dict_hyphen_load(lang);
}

static char *
_layout_wrap_hyphens_get(const Eina_Unicode *text, const char *lang,
      int word_start, int word_len)
{
   char *hyphens = NULL;
   char **rep = NULL;
   int *pos = NULL;
   int *cut = NULL;
   HyphenDict *dict;
   char *converted_text = NULL;
   size_t converted_text_offset = 0;
   size_t converted_len = 0;

   dict = _hyphen_dict_get_from_lang(lang);
   if (!dict)
     {
        ERR("Couldn't find matching dictionary and couldn't fallback to locale %s\n", lang);
        return NULL;
     }

   /* Convert UTF-32 encoded text to the other encoding
    * which is described in hyphen dictionary. */
   if (strcmp(dict->cset, "UTF-32"))
     {
        converted_text = eina_str_convert_len("UTF-32", dict->cset,
                                              (char *)(text + word_start),
                                              word_len * sizeof(Eina_Unicode),
                                              &converted_len);

        if (!converted_text) goto hyphens_done;

        /* Skip BOM character (0xFFFE) from converted text */
        if ((converted_len >= 2) &&
            (converted_text[0] == 0xff) &&
            (converted_text[1] == 0xfe))
          converted_text_offset = 2;

        /* If there is only a BOM character, return NULL */
        if (converted_len == converted_text_offset)
          goto hyphens_done;
     }

   if (converted_text)
     {
        hyphens = malloc(sizeof(char) * (converted_len + 5));
        hnj_hyphen_hyphenate2(dict, converted_text + converted_text_offset,
                              (int)(converted_len - converted_text_offset), hyphens, NULL, &rep, &pos, &cut);
     }
   else
     {
        hyphens = malloc(sizeof(char) * (word_len + 5));
        hnj_hyphen_hyphenate2(dict, (char *)(text + word_start),
                              word_len, hyphens, NULL, &rep, &pos, &cut);
     }

hyphens_done:
   if (converted_text) free(converted_text);

   return hyphens;
}

#endif //HAVE_HYPHEN
#endif //EVAS_TEXTBLOCK_HYPHENATION_H_