/**

  * vim: set ts=4 :

  * =============================================================================

  * SourceMod Regular Expressions Extension

  * Copyright (C) 2004-2008 AlliedModders LLC.  All rights reserved.

  * =============================================================================

  *

  * This program is free software; you can redistribute it and/or modify it under

  * the terms of the GNU General Public License, version 3.0, as published by the

  * Free Software Foundation.

  * 

  * 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, see <http://www.gnu.org/licenses/>.

  *

  * As a special exception, AlliedModders LLC gives you permission to link the

  * code of this program (as well as its derivative works) to "Half-Life 2," the

  * "Source Engine," the "SourcePawn JIT," and any Game MODs that run on software

  * by the Valve Corporation.  You must obey the GNU General Public License in

  * all respects for all other code used.  Additionally, AlliedModders LLC grants

  * this exception to all derivative works.  AlliedModders LLC defines further

  * exceptions, found in LICENSE.txt (as of this writing, version JULY-31-2007),

  * or <http://www.sourcemod.net/license.php>.

  *

  * Version: $Id$

  */

 #include "pcre.h"

 #include "CRegEx.h"

 #include <sh_string.h>

 #include "extension.h"

 RegEx::RegEx()

 {

 	mErrorOffset = 0;

 	mError = NULL;

 	re = NULL;

 	mFree = true;

 	subject = NULL;

 	mSubStrings = 0;

 }

 void RegEx::Clear ()

 {

 	mErrorOffset = 0;

 	mError = NULL;

 	if (re)

 		pcre_free(re);

 	re = NULL;

 	mFree = true;

 	if (subject)

 		delete [] subject;

 	subject = NULL;

 	mSubStrings = 0;

 }

 RegEx::~RegEx()

 {

 	Clear();

 }

 bool RegEx::isFree(bool set, bool val)

 {

 	if (set)

 	{

 		mFree = val;

 		return true;

 	} else {

 		return mFree;

 	}

 }

 int RegEx::Compile(const char *pattern, int iFlags)

 {

 	if (!mFree)

 		Clear();

 	re = pcre_compile(pattern, iFlags, &mError, &mErrorOffset, NULL);

 	if (re == NULL)

 	{

 		return 0;

 	}

 	mFree = false;

 	return 1;

 }

 int RegEx::Match(const char *str)

 {

 	int rc = 0;

 	if (mFree || re == NULL)

 		return -1;

 	this->ClearMatch();

 	//save str

 	subject = new char[strlen(str)+1];

 	strcpy(subject, str);

 	rc = pcre_exec(re, NULL, subject, (int)strlen(subject), 0, 0, ovector, 30);

 	if (rc < 0)

 	{

 		if (rc == PCRE_ERROR_NOMATCH)

 		{

 			return 0;

 		} else {

 			mErrorOffset = rc;

 			return -1;

 		}

 	}

 	mSubStrings = rc;

 	return 1;

 }

 void RegEx::ClearMatch()

 {

 	// Clears match results

 	mErrorOffset = 0;

 	mError = NULL;

 	if (subject)

 		delete [] subject;

 	subject = NULL;

 	mSubStrings = 0;

 }

 const char *RegEx::GetSubstring(int s, char buffer[], int max)

 {

 	int i = 0;

 	if (s >= mSubStrings || s < 0)

 		return NULL;

 	char *substr_a = subject + ovector[2*s];

 	int substr_l = ovector[2*s+1] - ovector[2*s];

 	for (i = 0; i<substr_l; i++)

 	{

 		if (i >= max)

 			break;

 		buffer[i] = substr_a[i];

 	}

 	buffer[i] = '\0';

 	return buffer;

 }