ffregex.c

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/*
 * finflect - Algorithms and tools for inflecting Finnish nouns
 * Copyright (C) 2004, 2005  The FinFlect Team
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 * 
 * 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, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 * 
 * 
 * For the complete legal text of the GNU Lesser General Public License,
 * see the file LICENSE. For a complete list of authors and copyright
 * holders, see the file AUTHORS.
 */

/**
 * @file ffregex.c Implements the ffstring regular expression wrappers declared
 * in ffregex.h.
 */
 
#include "ffregex.h"
#include "tcrip.h"

#include <stdlib.h>
#include <sys/types.h>
#include <regex.h>
#include <string.h>

static ffbool ffregex_do_match(const ffchar* needle, const ffstring* haystack, ffint32 cflags)
{
  regex_t regex;
  ffint32 result;
  
  regcomp(&regex, needle, cflags);
  result = regexec(&regex, haystack->str, 0, NULL, 0);
  regfree(&regex);
  
  /*
   * regexec returns 0 on match, REG_NOMATCH (presumably non-zero) on no match
   * so let's just negate it, because we want to be true on match and false on
   * no match
   */
  return !result;
}

ffbool ffregex_match(const ffchar* needle, const ffstring* haystack)
{
  return ffregex_do_match(needle, haystack, REG_NOSUB | REG_EXTENDED);
}

ffbool ffregex_match_ci(const ffchar* needle, const ffstring* haystack)
{
  return ffregex_do_match(needle, haystack, REG_ICASE | REG_NOSUB | REG_EXTENDED);
}

static ffbool ffregex_do_replace(const ffchar* needle, const ffchar* replace, ffstring* haystack, ffint32 cflags)
{
  ffchar* dst = tcregsub(haystack->str, needle, replace, cflags);
  
  if(!dst)
    return 0;
  else {
    free(haystack->str);
    haystack->str = dst;
    haystack->len == strlen(dst);
    return 1;
  }
}

ffbool ffregex_replace(const ffchar* needle, const ffchar* replace, ffstring* haystack)
{
  return ffregex_do_replace(needle, replace, haystack, REG_EXTENDED);
}

ffbool ffregex_replace_ci(const ffchar* needle, const ffchar* replace, ffstring* haystack)
{
  return ffregex_do_replace(needle, replace, haystack, REG_ICASE | REG_EXTENDED);
}

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