wecis 2.0 RC version

Please notify me when debugging bugs, thank you!
New version features:
1. Add {-script lang='php'-} template and you can also write PHP code
2. Modify 1.0 detailed errors: If there is no hard work code, optimize the core code to improve the running and compilation speed.
3. Add template formatting function {-$string|subistr(12):'...'-}, time formatting {-$time|time('ymd')-}

/**
 *      [Wecis] (C)2012-2099 Haowei Inc.
 *      This is NOT a freeware, use is subject to license terms
 *		version: 2.0 RC
**/

class wecis{

	private $assign=array();
	public $tpl_cache_dir = 'cache/';
	public $tpl_cache_open = TRUE;
	public $tpl_cache_time = 5 ;
	public $tpl_tpl_dir = 'template/';
	public $tpl_rw_left = '{-';
	public $tpl_rw_right = '-}';

	public function wecis(){
		return '[{name:'wecis 2.0 rc'}]';
	}

	public function assign($tplvar,$value){
		if(empty($tplvar) || empty($value)){
			$this->error('wecis-> assign() Parameters are missing');
		}
		return $this->assign[$tplvar]=$value;
	}

	public function display($tplfile){
		if(empty($tplfile)){ $this->error('wecis-> display() Parameters are missing'); }
		if($this->tpl_cache_open){
			if(file_exists($this->tpl_cache_dir.$this->cahce_format($tplfile))){
				if($this->cahce_timeout($tplfile)) {
					$this->cache_delete($tplfile);
					include $this->cache($tplfile) ? $this->tpl_cache_dir.$this->cahce_format($tplfile) : '';
				}else{
					include $this->tpl_cache_dir.$this->cahce_format($tplfile);

				}
			}else{
				include $this->cache($tplfile) ? $this->tpl_cache_dir.$this->cahce_format($tplfile) : '';
			}
		}else{
			include $this->cache($tplfile) ? $this->tpl_cache_dir.$this->cahce_format($tplfile) : '';
		}
	}

	public function cache($tplfile){
		$data = file_get_contents($this->tpl_tpl_dir.$tplfile);
		$data = preg_replace('/'.$this->tpl_rw_left.'script lang='php''.$this->tpl_rw_right.'/','		$data = preg_replace('/'.$this->tpl_rw_left.'/script'.$this->tpl_rw_right.'/','?>',$data);
		$data = preg_replace('/'.$this->tpl_rw_left.'loop ($(.*)?) as ($(.*)?)'.$this->tpl_rw_right.'/','',$data);
		$data = preg_replace('/'.$this->tpl_rw_left.'/loop'.$this->tpl_rw_right.'/','',$data);
		$data = preg_replace('/'.$this->tpl_rw_left.'($(.*)?)[((.*)?)]'.$this->tpl_rw_right.'/','',$data);
		$data = preg_replace('/'.$this->tpl_rw_left.'if((.*)?)'.$this->tpl_rw_right.'/','',$data);
		$data = preg_replace('/'.$this->tpl_rw_left.'else'.$this->tpl_rw_right.'/','',$data);
		$data = preg_replace('/'.$this->tpl_rw_left.'/if'.$this->tpl_rw_right.'/','',$data);
		$data = preg_replace('/'.$this->tpl_rw_left.'($(.*)?)|subistr(((.*)?)):((.*)?)'.$this->tpl_rw_right.'/','',$data);
		$data = preg_replace('/'.$this->tpl_rw_left.'($(.*)?)|time:(((.*)?))'.$this->tpl_rw_right.'/',"",$data);
		$data = preg_replace('/'.$this->tpl_rw_left.'($(.*)?)'.$this->tpl_rw_right.'/','',$data);
		$arr='';
		foreach($this->assign as $k=>$v) {
			if(!is_array($v)) {
				$data = !is_numeric($v) ? str_replace('$'.$k,'''.$v.''',$data) : str_replace('$'.$k,$v,$data);
			}else{
				$arr.='';
			}
		}
		return file_put_contents($this->tpl_cache_dir.$this->cahce_format($tplfile),$arr.$data) ? 1 : 0;
	}

	public function cahce_timeout($tplfile){
		$time = time();
		$filetime = fileatime($this->tpl_cache_dir.$this->cahce_format($tplfile));
		return $time-$filetime > ($this->tpl_cache_time*60) ? 1 : 0;
	}

	public function cahce_format($tplfile){
		return md5($this->version()).str_replace('/','.',$tplfile).'.php';
	}

	public function cache_delete($tplfile){
		return unlink($this->tpl_cache_dir.$this->cahce_format($tplfile)) ? 1 : 0;
	}

	private function error($str){
		return exit($str);
	}

	public function version(){
		return 'wecis 2.0 RC';
	}

}