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/* This file is part of GNU Dico.
Copyright (C) 2008-2018 Sergey Poznyakoff
GNU Dico is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
GNU Dico is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU Dico. If not, see <http://www.gnu.org/licenses/>. */
#include <dicod.h>
static int levenshtein_distance = 1;
static int
lev_sel(int cmd, dico_key_t key, const char *dict_word)
{
if (cmd == DICO_SELECT_RUN) {
int dist = dico_levenshtein_distance(key->word, dict_word,
*(int*)key->strat->closure);
if (dist < 0)
return 0;
return dist <= levenshtein_distance;
}
return 0;
}
static int lev_flags = 0;
static int nlev_flags = DICO_LEV_NORM;
static int dlev_flags = DICO_LEV_DAMERAU;
static int ndlev_flags = DICO_LEV_NORM | DICO_LEV_DAMERAU;
static struct dico_strategy levstrat[] = {
{ "lev",
"Match headwords within given Levenshtein distance",
lev_sel,
&lev_flags },
{ "nlev",
"Match headwords within given Levenshtein distance (normalized)",
lev_sel,
&nlev_flags },
{ "dlev",
"Match headwords within given Damerau-Levenshtein distance",
lev_sel,
&dlev_flags },
{ "ndlev",
"Match headwords within given Damerau-Levenshtein distance (normalized)",
lev_sel,
&ndlev_flags }
};
static void
dicod_xlevdist(dico_stream_t str, int argc, char **argv)
{
if (c_strcasecmp(argv[1], "tell") == 0)
stream_printf(str, "280 %d\n", levenshtein_distance);
else if (isdigit(argv[1][0]) && argv[1][0] != '0' && argv[1][1] == 0) {
levenshtein_distance = atoi(argv[1]);
stream_printf(str, "250 ok - Levenshtein threshold set to %d\n",
levenshtein_distance);
} else
stream_writez(str, "500 invalid argument\n");
}
void
register_lev(void)
{
int i;
static struct dicod_command cmd[] = {
{ "XLEV", 2, 2, "distance", "Set Levenshtein distance",
dicod_xlevdist },
{ NULL }
};
for (i = 0; i < DICO_ARRAY_SIZE(levstrat); i++)
dico_strategy_add(&levstrat[i]);
dico_set_default_strategy("nlev");
dicod_capa_register("xlev", cmd, NULL, NULL);
}
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