/**

 * 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 "extension.h"

#include <sh_string.h>

#include "pcre.h"

#include "CRegEx.h"

using namespace SourceHook;

/**

 * @file extension.cpp

 * @brief Implement Regex extension code here.

 */

RegexExtension g_RegexExtension;		/**< Global singleton for extension's main interface */

SMEXT_LINK(&g_RegexExtension);

RegexHandler g_RegexHandler;

HandleType_t g_RegexHandle=0;

bool RegexExtension::SDK_OnLoad(char *error, size_t err_max, bool late)

{

	g_pShareSys->AddNatives(myself,regex_natives);

	g_RegexHandle = g_pHandleSys->CreateType("Regex", &g_RegexHandler, 0, NULL, NULL, myself->GetIdentity(), NULL);

	return true;

}

void RegexExtension::SDK_OnUnload()

{

	g_pHandleSys->RemoveType(g_RegexHandle, myself->GetIdentity());

}

static cell_t CompileRegex(IPluginContext *pCtx, const cell_t *params)

{

	char *regex;

	pCtx->LocalToString(params[1], &regex);

	RegEx *x = new RegEx();

	if (x->Compile(regex, params[2]) == 0)

	{

		cell_t *eOff;

		pCtx->LocalToPhysAddr(params[5], &eOff);

		const char *err = x->mError;

		*eOff = x->mErrorOffset;

		pCtx->StringToLocal(params[3], params[4], err ? err:"unknown");

		return 0;

	}

	return g_pHandleSys->CreateHandle(g_RegexHandle, (void*)x, pCtx->GetIdentity(), myself->GetIdentity(), NULL);

}

static cell_t MatchRegex(IPluginContext *pCtx, const cell_t *params)

{

	Handle_t hndl = static_cast<Handle_t>(params[1]);

	HandleError err;

	HandleSecurity sec;

	sec.pOwner = NULL;

	sec.pIdentity = myself->GetIdentity();

	RegEx *x;

	if ((err=g_pHandleSys->ReadHandle(hndl, g_RegexHandle, &sec, (void **)&x)) != HandleError_None)

	{

		return pCtx->ThrowNativeError("Invalid file handle %x (error %d)", hndl, err);

	}

	if (!x)

	{

		pCtx->ThrowNativeError("Regex data not found\n");

		return 0;

	}

	char *str;

	pCtx->LocalToString(params[2], &str);

	int e = x->Match(str);

	if (e == -1)

	{

		/* there was a match error.  move on. */

		cell_t *res;

		pCtx->LocalToPhysAddr(params[3], &res);

		*res = x->mErrorOffset;

		/* only clear the match results, since the regex object

		   may still be referenced later */

		x->ClearMatch();

		return -1;

	}

	else if (e == 0) 

	{

		/* only clear the match results, since the regex object

		   may still be referenced later */

		x->ClearMatch();

		return 0;

	} 

	else 

	{

		return x->mSubStrings;

	}

}

static cell_t GetRegexSubString(IPluginContext *pCtx, const cell_t *params)

{

	Handle_t hndl=static_cast<Handle_t>(params[1]);

	HandleError err;

	HandleSecurity sec;

	sec.pOwner=NULL;

	sec.pIdentity=myself->GetIdentity();

	RegEx *x;

	if ((err=g_pHandleSys->ReadHandle(hndl, g_RegexHandle, &sec, (void **)&x)) != HandleError_None)

	{

		return pCtx->ThrowNativeError("Invalid file handle %x (error %d)", hndl, err);

	}

	if (!x)

	{

		pCtx->ThrowNativeError("Regex data not found\n");

		return 0;

	}

	static char buffer[4096];

	const char *ret=x->GetSubstring(params[2], buffer, sizeof(buffer));

	if(!ret)

	{

		return 0;

	}

	pCtx->StringToLocalUTF8(params[3], params[4], ret, NULL);

	return 1;

}

void RegexHandler::OnHandleDestroy(HandleType_t type, void *object)

{

	RegEx *x = (RegEx *)object;

	x->Clear();

	delete x;

}

const sp_nativeinfo_t regex_natives[] = 

{

	{"GetRegexSubString",			GetRegexSubString},

	{"MatchRegex",					MatchRegex},

	{"CompileRegex",				CompileRegex},

	{NULL,							NULL},

};