SMARTY TEMPLATE. I'm coding Controller that support Smarty

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system/library/smarty/
system/library/smarty/libs/

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system/engine/controllerBase.php

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require_once(DIR_SYSTEM . 'engine/controllerBase.php');
include(DIR_SYSTEM . 'library/smarty/libs/Smarty.class.php'); 

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<?php

//ControllerBase V 0.1.1b FOR  OpenCart 1.2.x
// Version Number Meaning   A.B.C ,  A = Major Version, B =  Feature Change, C = Building Number / Closed Bug
//This supports both Smarty Template and OpenCart Template Framework
// Create By Treebhoph Thoomsan,  treebhoph@gmail.com

abstract class ControllerBase extends Controller {

	//The Constant Variables allow programmer to determine that what a Template Engine Framework want to use, a Default value is Smarty template.
	const DEFAULT_TPL = 'default';
	const SMARTY_TPL = 'smarty';
	
	private $smarty;
	private $moduleOutputs = array();
	
	//Set a smarty Template as a Default Template Engine.
	protected $templateEngine = ControllerBase::SMARTY_TPL;
	
	//Set a Default Position for module as Left, right  **** Now OpenCart 1.2.6 Support only Left and Right.
	protected $modulePositions = 'left,right';
	
	
	protected function render() {
	
		if( $this->smarty == null )
			$this->smarty = new Smarty();
	
		foreach ($this->children as $child) {
			$file  = DIR_APPLICATION . 'controller/' . $child . '.php';
			$class = 'Controller' . preg_replace('/[^a-zA-Z0-9]/', '', $child);
		
			if (file_exists($file)) {
				require_once($file);
				$controller = new $class();
				$controller->index();
				
				if( $this->templateEngine == ControllerBase::DEFAULT_TPL ) {
					//When this Controller working with OpenCart Template Framework.
					
					$this->data[$controller->id] = $controller->output;
				}
				else if( $this->templateEngine == ControllerBase::SMARTY_TPL ) {	
					//When this Controller working with Smarty Template.
					
					$mod = substr($child, 0, 7 );
					
					//Dose a childern Controler is a Module ?.
					if( strtolower($mod) == "module/" ) {

						//Find  a Controller ID from Module Code, ( OpenCart 1.2.X using Modue Code as a Controller ID too. ).
						$pos = (int)strrpos($child, "/");
					
						if( $pos > 0 ) {
							$moduleCode = substr($child, $pos + 1);
							
							//Assign a Template Output from the Module to a  $moduleOutputs array .
							$this->moduleOutputs[$moduleCode] = $controller->output;
						}
					}
					else {
						// When it is only Childen that dose not a module.
						$this->data[$controller->id] = $controller->output;
					}
				}
			} else {
				exit('Error: Could not load controller ' . $child . '!');
			}
		}
		
		$this->output = $this->fetch($this->template);
		
		if ($this->layout) {
			$file  = DIR_APPLICATION . 'controller/' . $this->layout . '.php';
			$class = 'Controller' . preg_replace('/[^a-zA-Z0-9]/', '', $this->layout);
			
			if (file_exists($file)) {
				require_once($file);
			
				$controller = new $class();
				$controller->data[$this->id] = $this->output;
				$controller->index();
				$this->output = $controller->output;
				
			} else {
				exit('Error: Could not load controller ' . $this->layout . '!');
			}	
		}
		
		$this->response->setOutput($this->output);
	}
	
	protected function fetch($filename) {
		$file = DIR_TEMPLATE . $filename;
    
		if (file_exists($file)) {
		
			ob_start();
	
			if( strtolower($this->templateEngine) == ControllerBase::DEFAULT_TPL ) {
				//When this Controller using OpenCart Template Framework.
				
				extract($this->data);
				require($file);
				
				//Get Template Output From OpenCart Template Framework.
				$content = ob_get_contents();
			}
			else if( strtolower($this->templateEngine) == ControllerBase::SMARTY_TPL ) {
				//When this Controller using Smarty Template Framework.
				
				$this->smarty->compile_check = true;
				$this->smarty->debugging = false;
				
				//When smarty dose not Cached.
				if(!$this->smarty->is_cached($file))  {
				
					//Assign Data From Controller to Template View.
					foreach ($this->data as $key => $value) 
						$this->smarty->assign($key,$value);
						
					
					//Assign default value for module postion.
					//Thsi ControllerBase version only Support Left and Right Postion like OpenCart 1.2.6.
					if( $this->modulePositions != '' ) {
						$modulePos = split( $this->modulePositions, ',' );
						foreach( $modulePos as $pos ) {
							if( $pos != '' )
								$this->smarty->assign(trim($pos), '');
						}
					}
				
					//When this Controller Object is a  Module Container.
					if( count($this->moduleOutputs)> 0 && count($this->data['modules']) > 0 ) {
						$regionOutputs = array();
					
						foreach( $this->data['modules'] as $module ) {
							if( array_key_exists($module['position'], $regionOutputs) ) 
								$regionOutputs[$module['position']] .= $this->moduleOutputs[$module['code']];
							else 
								$regionOutputs[$module['position']] = $this->moduleOutputs[$module['code']];
						}
					
						//Set  all of modules output To Smarty Template.
						foreach ($regionOutputs as $key => $value) 
							$this->smarty->assign($key,$value);
					}	

				}
				
				//Get Template Output From Smarty.
				$content = $this->smarty->fetch($file);
			}
			
			ob_end_clean();	
			
      		return $content;
			
    	} else {
      		exit('Error: Could not load template ' . $file . '!');
    	}
	}
}
?>

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class ControllerCommonHeader extends Controller {
	public function index( ) {
		.
		.
	}
}

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class ControllerCommonHeader extends ControllerBase {
	public function index( ) {
		.
		.
	}
}

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<div class="div1">
	<div class="div2">
		<a href="{$home}">
			<img src="catalog/view/theme/default/image/logo.png" title="{$store}" alt="{$store}" />
		</a>
	</div>
	<div class="div3">{$language}{$search}</div>
</div>

<div class="div4">
	<div class="div5">
		<a href="{$home}" style="background: url('catalog/view/theme/default/image/icon_home.png') left center no-repeat;">{$text_home}</a>
		<a href="{$special}" style="background: url('catalog/view/theme/default/image/icon_special.png') left center no-repeat;">{$text_special}</a>
		{if !$logged}
			<a href="{$login}" style="background: url('catalog/view/theme/default/image/icon_login.png') left center no-repeat;">{$text_login}</a>
    		{else}
			<a href="{$logout}" style="background: url('catalog/view/theme/default/image/icon_logout.png') left center no-repeat;">{$text_logout}</a>
    		{/if}
		<a href="{$account}" style="background: url('catalog/view/theme/default/image/icon_account.png') left center no-repeat;">{$text_account}</a>
	</div>
	<div class="div6">
		<a href="{$checkout}" style="background: url('catalog/view/theme/default/image/icon_checkout.png') left center no-repeat;">{$text_checkout}</a>
		<a href="{$cart}" style="background: url('catalog/view/theme/default/image/icon_basket.png') left center no-repeat;">{$text_cart}</a>
	</div>
</div>

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class ControllerCommonLayout extends ControllerBase {
}

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" dir="{$direction}" lang="{$language}" xml:lang="{$language}">
<head>
	<title>{$title}</title>

{if $description}	
<meta name="description" content="{$description}" />
{/if}
	
<base href="{$base}" />
<link rel="stylesheet" type="text/css" href="catalog/view/theme/default/stylesheet/stylesheet.css" />
	<script type="text/javascript" src="catalog/view/javascript/jquery/jquery-1.3.min.js"></script>
<script type="text/javascript" src="catalog/view/javascript/jquery/thickbox/thickbox-compressed.js"></script>
<link rel="stylesheet" type="text/css" href="catalog/view/javascript/jquery/thickbox/thickbox.css" />
	<script type="text/javascript" src="catalog/view/javascript/jquery/tab.js"></script>
</head>

<body>
<div id="container">
	<div id="header">{$header}</div>
	<div id="breadcrumb">
		{foreach from=$breadcrumbs item=breadcrumb }
			{$breadcrumb.separator}
			<a href="{$breadcrumb.href}">{$breadcrumb.text}</a>
		{/foreach}
	</div>
	<div id="column_left">	
		{$left}
	</div>
	<div id="column_right">	
		{$right}
	</div>
	<div id="content">{$content}</div>
	<div id="footer">{$footer}</div>
</div>
</body>
</html>