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/* phonetic.c - generic replacement aglogithms for phonetic transformation
Copyright (C) 2000 Bjoern Jacke
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License version 2.1 as published by the Free Software Foundation;
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; If not, see
<http://www.gnu.org/licenses/>.
Changelog:
2000-01-05 Bjoern Jacke <bjoern at j3e.de>
Initial Release insprired by the article about phonetic
transformations out of c't 25/1999
2007-07-26 Bjoern Jacke <bjoern at j3e.de>
Released under MPL/GPL/LGPL tri-license for Hunspell
2007-08-23 Laszlo Nemeth <nemeth at OOo>
Porting from Aspell to Hunspell using C-like structs
*/
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <ctype.h>
#include "csutil.hxx"
#include "phonet.hxx"
void init_phonet_hash(phonetable& parms) {
for (int i = 0; i < HASHSIZE; i++) {
parms.hash[i] = -1;
}
for (int i = 0; parms.rules[i][0] != '\0'; i += 2) {
/** set hash value **/
int k = (unsigned char)parms.rules[i][0];
if (parms.hash[k] < 0) {
parms.hash[k] = i;
}
}
}
// like strcpy but safe if the strings overlap
// but only if dest < src
static inline void strmove(char* dest, char* src) {
while (*src)
*dest++ = *src++;
*dest = '\0';
}
static int myisalpha(char ch) {
if ((unsigned char)ch < 128)
return isalpha(ch);
return 1;
}
/* Do phonetic transformation. */
/* phonetic transcription algorithm */
/* see: http://aspell.net/man-html/Phonetic-Code.html */
/* convert string to uppercase before this call */
std::string phonet(const std::string& inword, phonetable& parms) {
int i, k = 0, p, z;
int k0, n0, p0 = -333;
char c;
typedef unsigned char uchar;
size_t len = inword.size();
if (len > MAXPHONETUTF8LEN)
return std::string();
char word[MAXPHONETUTF8LEN + 1];
strncpy(word, inword.c_str(), MAXPHONETUTF8LEN);
word[MAXPHONETUTF8LEN] = '\0';
std::string target;
/** check word **/
i = z = 0;
while ((c = word[i]) != '\0') {
int n = parms.hash[(uchar)c];
int z0 = 0;
if (n >= 0 && !parms.rules[n].empty()) {
/** check all rules for the same letter **/
while (parms.rules[n][0] == c) {
/** check whole string **/
k = 1; /** number of found letters **/
p = 5; /** default priority **/
const char*s = parms.rules[n].c_str();
s++; /** important for (see below) "*(s-1)" **/
while (*s != '\0' && word[i + k] == *s && !isdigit((unsigned char)*s) &&
strchr("(-<^$", *s) == NULL) {
k++;
s++;
}
if (*s == '(') {
/** check letters in "(..)" **/
if (myisalpha(word[i + k]) // ...could be implied?
&& strchr(s + 1, word[i + k]) != NULL) {
k++;
while (*s != ')')
s++;
s++;
}
}
p0 = (int)*s;
k0 = k;
while (*s == '-' && k > 1) {
k--;
s++;
}
if (*s == '<')
s++;
if (isdigit((unsigned char)*s)) {
/** determine priority **/
p = *s - '0';
s++;
}
if (*s == '^' && *(s + 1) == '^')
s++;
if (*s == '\0' || (*s == '^' && (i == 0 || !myisalpha(word[i - 1])) &&
(*(s + 1) != '$' || (!myisalpha(word[i + k0])))) ||
(*s == '$' && i > 0 && myisalpha(word[i - 1]) &&
(!myisalpha(word[i + k0])))) {
/** search for followup rules, if: **/
/** parms.followup and k > 1 and NO '-' in searchstring **/
char c0 = word[i + k - 1];
n0 = parms.hash[(uchar)c0];
// if (parms.followup && k > 1 && n0 >= 0
if (k > 1 && n0 >= 0 && p0 != (int)'-' && word[i + k] != '\0' && !parms.rules[n0].empty()) {
/** test follow-up rule for "word[i+k]" **/
while (parms.rules[n0][0] == c0) {
/** check whole string **/
k0 = k;
p0 = 5;
s = parms.rules[n0].c_str();
s++;
while (*s != '\0' && word[i + k0] == *s &&
!isdigit((unsigned char)*s) &&
strchr("(-<^$", *s) == NULL) {
k0++;
s++;
}
if (*s == '(') {
/** check letters **/
if (myisalpha(word[i + k0]) &&
strchr(s + 1, word[i + k0]) != NULL) {
k0++;
while (*s != ')' && *s != '\0')
s++;
if (*s == ')')
s++;
}
}
while (*s == '-') {
/** "k0" gets NOT reduced **/
/** because "if (k0 == k)" **/
s++;
}
if (*s == '<')
s++;
if (isdigit((unsigned char)*s)) {
p0 = *s - '0';
s++;
}
if (*s == '\0'
/** *s == '^' cuts **/
|| (*s == '$' && !myisalpha(word[i + k0]))) {
if (k0 == k) {
/** this is just a piece of the string **/
n0 += 2;
continue;
}
if (p0 < p) {
/** priority too low **/
n0 += 2;
continue;
}
/** rule fits; stop search **/
break;
}
n0 += 2;
} /** End of "while (parms.rules[n0][0] == c0)" **/
if (p0 >= p && parms.rules[n0][0] == c0) {
n += 2;
continue;
}
} /** end of follow-up stuff **/
/** replace string **/
s = parms.rules[n + 1].c_str();
p0 = (!parms.rules[n].empty() &&
strchr(parms.rules[n].c_str() + 1, '<') != NULL)
? 1
: 0;
if (p0 == 1 && z == 0) {
/** rule with '<' is used **/
if (!target.empty() && *s != '\0' &&
(target[target.size()-1] == c || target[target.size()-1] == *s)) {
target.erase(target.size() - 1);
}
z0 = 1;
z = 1;
k0 = 0;
while (*s != '\0' && word[i + k0] != '\0') {
word[i + k0] = *s;
k0++;
s++;
}
if (k > k0)
strmove(&word[0] + i + k0, &word[0] + i + k);
/** new "actual letter" **/
c = word[i];
} else { /** no '<' rule used **/
i += k - 1;
z = 0;
while (*s != '\0' && *(s + 1) != '\0' && target.size() < len) {
if (target.empty() || target[target.size()-1] != *s) {
target.push_back(*s);
}
s++;
}
/** new "actual letter" **/
c = *s;
if (!parms.rules[n].empty() &&
strstr(parms.rules[n].c_str() + 1, "^^") != NULL) {
if (c != '\0') {
target.push_back(c);
}
strmove(&word[0], &word[0] + i + 1);
i = 0;
z0 = 1;
}
}
break;
} /** end of follow-up stuff **/
n += 2;
} /** end of while (parms.rules[n][0] == c) **/
} /** end of if (n >= 0) **/
if (z0 == 0) {
if (k && !p0 && target.size() < len && c != '\0') {
/** condense only double letters **/
target.push_back(c);
/// printf("\n setting \n");
}
i++;
z = 0;
k = 0;
}
} /** end of while ((c = word[i]) != '\0') **/
return target;
} /** end of function "phonet" **/
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