/*
    Variables Plugin for Miranda-IM (www.miranda-im.org)
    Copyright 2003-2006 P. Boon

    This program 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 2 of the License, or
    (at your option) any later version.

    This program 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 this program; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

#include "variables.h"

/*
	pattern, subject
*/
static TCHAR *parseRegExpCheck(ARGUMENTSINFO *ai)
{
	const char *err;
	int erroffset;
	char szVal[34];
	int offsets[99];

	if (ai->argc != 3)
		return NULL;

	ai->flags = AIF_FALSE;

	ptrA arg1(mir_t2a(ai->targv[1]));
	ptrA arg2(mir_t2a(ai->targv[2]));

	pcre *ppat = pcre_compile(arg1, 0, &err, &erroffset, NULL);
	if (ppat == NULL)
		return NULL;

	pcre_extra *extra = pcre_study(ppat, 0, &err);
	int nmat = pcre_exec(ppat, extra, arg2, (int)strlen(arg2), 0, 0, offsets, 99);
	if (nmat > 0) {
		ai->flags &= ~AIF_FALSE;
		_ltoa(nmat, szVal, 10);
		return mir_a2t(szVal);
	}

	return mir_tstrdup(_T("0"));
}

/*
	pattern, subject, substring no (== PCRE string no (starting at 0))
	*/
static TCHAR *parseRegExpSubstr(ARGUMENTSINFO *ai)
{
	const char *err, *substring;
	int erroffset, number;
	int offsets[99];

	if (ai->argc != 4)
		return NULL;

	ptrA arg1(mir_t2a(ai->targv[1]));
	ptrA arg2(mir_t2a(ai->targv[2]));
	ptrA arg3(mir_t2a(ai->targv[3]));

	number = atoi(arg3);
	if (number < 0)
		return NULL;

	ai->flags = AIF_FALSE;
	pcre *ppat = pcre_compile(arg1, 0, &err, &erroffset, NULL);
	if (ppat == NULL)
		return NULL;

	pcre_extra *extra = pcre_study(ppat, 0, &err);
	int nmat = pcre_exec(ppat, extra, arg2, (int)strlen(arg2), 0, 0, offsets, 99);
	if (nmat >= 0)
		ai->flags &= ~AIF_FALSE;

	if (pcre_get_substring(arg2, offsets, nmat, number, &substring) < 0)
		ai->flags |= AIF_FALSE;
	else {
		TCHAR *tres = mir_a2t(substring);
		pcre_free_substring(substring);
		return tres;
	}

	return mir_tstrdup(_T(""));
}

void registerRegExpTokens()
{
	registerIntToken(REGEXPCHECK, parseRegExpCheck, TRF_FUNCTION, LPGEN("Regular Expressions")"\t(x,y)\t"LPGEN("(ANSI input only) the number of substring matches found in y with pattern x"));
	registerIntToken(REGEXPSUBSTR, parseRegExpSubstr, TRF_FUNCTION, LPGEN("Regular Expressions")"\t(x,y,z)\t"LPGEN("(ANSI input only) substring match number z found in subject y with pattern x"));
}