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/* This file is part of GNU Dico.
Copyright (C) 2008, 2010, 2012 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 <stdlib.h>
#include <ctype.h>
#include <errno.h>
#include <appi18n.h>
#include <pcre.h>
struct dico_pcre_flag
{
int c;
int flag;
};
static struct dico_pcre_flag flagtab[] = {
{ 'a', PCRE_ANCHORED }, /* Force pattern anchoring */
{ 'e', PCRE_EXTENDED }, /* Ignore whitespace and # comments */
{ 'i', PCRE_CASELESS }, /* Do caseless matching */
{ 'G', PCRE_UNGREEDY }, /* Invert greediness of quantifiers */
{ 0 },
};
static int
pcre_flag(int c, int *pflags)
{
struct dico_pcre_flag *p;
for (p = flagtab; p->c; p++) {
if (p->c == c) {
*pflags |= p->flag;
return 0;
} else if (p->c == tolower(c) || p->c == toupper(c)) {
*pflags &= ~p->flag;
return 0;
}
}
return 1;
}
static pcre *
compile_pattern(const char *pattern)
{
int cflags = PCRE_UTF8|PCRE_NEWLINE_ANY;
const char *error;
int error_offset;
char *tmp = NULL;
pcre *pre;
if (pattern[0] == '/') {
size_t len;
char *p;
pattern++;
p = strrchr(pattern, '/');
if (!p) {
dico_log(L_ERR, 0, _("PCRE missing terminating /: %s"),
pattern - 1);
return NULL;
}
len = p - pattern;
while (*++p) {
if (pcre_flag(*p, &cflags)) {
dico_log(L_ERR, 0, _("PCRE error: invalid flag %c"), *p);
return NULL;
}
}
tmp = malloc(len + 1);
if (!tmp)
return NULL;
memcpy(tmp, pattern, len);
tmp[len] = 0;
pattern = tmp;
}
pre = pcre_compile(pattern, cflags, &error, &error_offset, 0);
if (!pre) {
dico_log(L_ERR, 0,
_("pcre_compile(\"%s\") failed at offset %d: %s"),
pattern, error_offset, error);
}
free(tmp);
return pre;
}
static int
pcre_sel(int cmd, dico_key_t key, const char *dict_word)
{
int rc = 0;
char const *word = key->word;
pcre *pre = key->call_data;
switch (cmd) {
case DICO_SELECT_BEGIN:
pre = compile_pattern(word);
if (!pre)
return 1;
key->call_data = pre;
break;
case DICO_SELECT_RUN:
rc = pcre_exec(pre, 0, dict_word, strlen(dict_word), 0, 0,
NULL, 0) >= 0;
break;
case DICO_SELECT_END:
pcre_free(pre);
break;
}
return rc;
}
static struct dico_strategy pcre_strat = {
"pcre",
"Match using Perl-compatible regular expressions",
pcre_sel
};
static int
pcre_init(int argc, char **argv)
{
dico_strategy_add(&pcre_strat);
return 0;
}
struct dico_database_module DICO_EXPORT(pcre, module) = {
DICO_MODULE_VERSION,
DICO_CAPA_NODB,
pcre_init,
};
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