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/* This file is part of GNU Dico
Copyright (C) 2007-2008, 2010, 2012, 2016-2018 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/>. */
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <dico.h>
#include <ctype.h>
static char soundextbl[] =
"A0"
"B1"
"C2"
"D3"
"E0"
"F1"
"G2"
"H-"
"I0"
"J2"
"K2"
"L4"
"M5"
"N5"
"O0"
"P1"
"Q2"
"R6"
"S2"
"T3"
"U0"
"V1"
"W-"
"X2"
"Y0"
"Z2"
;
static int
soundex_code(int c)
{
char *p;
c = toupper(c);
for (p = soundextbl; *p; p += 2)
if (*p == c)
return p[1];
return 0;
}
int
dico_soundex_ascii(const char *s, char codestr[DICO_SOUNDEX_SIZE])
{
int i, prev;
codestr[0] = toupper(*s);
prev = soundex_code(codestr[0]);
for (i = 1, s++; i < DICO_SOUNDEX_SIZE-1 && *s; s++) {
int n = soundex_code(*s);
if (n) {
if (n == prev)
continue;
switch (n) {
case '0':
break;
case '-':
continue;
default:
codestr[i++] = n;
}
prev = n;
}
}
for (; i < DICO_SOUNDEX_SIZE-1; i++)
codestr[i] = '0';
codestr[i] = 0;
return 0;
}
/* Compute the soundex code for TEXT (a UTF8 string). Ignore
non-ASCII characters. */
int
dico_soundex(const char *text, char codestr[DICO_SOUNDEX_SIZE])
{
unsigned *input, *s;
int i, prev;
if (utf8_mbstr_to_wc(text, &input, NULL))
return -1;
s = input;
do {
codestr[0] = utf8_wc_toupper(*s++);
} while (codestr[0] > 127 || (prev = soundex_code(codestr[0])) == 0);
for (i = 1; i < DICO_SOUNDEX_SIZE-1 && *s; s++) {
int n = *s < 128 ? soundex_code(*s) : 0;
if (n) {
if (n == prev)
continue;
switch (n) {
case '0':
break;
case '-':
continue;
default:
codestr[i++] = n;
}
prev = n;
}
}
for (; i < DICO_SOUNDEX_SIZE-1; i++)
codestr[i] = '0';
codestr[i] = 0;
free(input);
return 0;
}
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