/**********************************************************************
  reggnu.c -  Oniguruma (regular expression library)
**********************************************************************/
/*-
 * Copyright (c) 2002-2018  K.Kosako  <sndgk393 AT ybb DOT ne DOT jp>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include "regint.h"
#include "oniggnu.h"

extern void
re_free_registers(OnigRegion* r)
{
  /* 0: don't free self */
  onig_region_free(r, 0);
}

extern int
re_adjust_startpos(regex_t* reg, const char* string, int size,
		   int startpos, int range)
{
  if (startpos > 0 && ONIGENC_MBC_MAXLEN(reg->enc) != 1 && startpos < size) {
    UChar *p;
    UChar *s = (UChar* )string + startpos;

    if (range > 0) {
      p = onigenc_get_right_adjust_char_head(reg->enc, (UChar* )string, s);
    }
    else {
      p = ONIGENC_LEFT_ADJUST_CHAR_HEAD(reg->enc, (UChar* )string, s);
    }
    return (int )(p - (UChar* )string);
  }

  return startpos;
}

extern int
re_match(regex_t* reg, const char* str, int size, int pos,
	 struct re_registers* regs)
{
  return onig_match(reg, (UChar* )str, (UChar* )(str + size),
		    (UChar* )(str + pos), regs, ONIG_OPTION_NONE);
}

extern int
re_search(regex_t* bufp, const char* string, int size, int startpos, int range,
	  struct re_registers* regs)
{
  return onig_search(bufp, (UChar* )string, (UChar* )(string + size),
		     (UChar* )(string + startpos),
		     (UChar* )(string + startpos + range),
		     regs, ONIG_OPTION_NONE);
}

extern int
re_compile_pattern(const char* pattern, int size, regex_t* reg, char* ebuf)
{
  int r;
  OnigErrorInfo einfo;

  r = onig_compile(reg, (UChar* )pattern, (UChar* )(pattern + size), &einfo);
  if (r != ONIG_NORMAL) {
    if (IS_NOT_NULL(ebuf))
      (void )onig_error_code_to_str((UChar* )ebuf, r, &einfo);
  }

  return r;
}

extern void
re_free_pattern(regex_t* reg)
{
  onig_free(reg);
}

extern int
re_alloc_pattern(regex_t** reg)
{
  *reg = (regex_t* )xmalloc(sizeof(regex_t));
  if (IS_NULL(*reg)) return ONIGERR_MEMORY;

  return onig_reg_init(*reg, ONIG_OPTION_DEFAULT,
		       ONIGENC_CASE_FOLD_DEFAULT,
		       OnigEncDefaultCharEncoding,
		       OnigDefaultSyntax);
}

extern void
re_set_casetable(const char* table)
{
  onigenc_set_default_caseconv_table((UChar* )table);
}

extern void
re_mbcinit(int mb_code)
{
  OnigEncoding enc;

  switch (mb_code) {
  case RE_MBCTYPE_ASCII:
    enc = ONIG_ENCODING_ASCII;
    break;
  case RE_MBCTYPE_EUC:
    enc = ONIG_ENCODING_EUC_JP;
    break;
  case RE_MBCTYPE_SJIS:
    enc = ONIG_ENCODING_SJIS;
    break;
  case RE_MBCTYPE_UTF8:
    enc = ONIG_ENCODING_UTF8;
    break;
  default:
    return ;
    break;
  }

  onig_initialize(&enc, 1);

  onigenc_set_default_encoding(enc);
}