<?php
  class template{
      public    $delim = "#";
      public    $template_path = "./template";
      public    $template_cache = "./cache";
      public    $cache_time = 0;
      public    $template_surfix = ".html";
      private   $current_template = "";
      private   $cache_file = "";
      private   $data = array();
      
      public function __get($name){
       return isset($this->data[$name])?$this->data[$name]:false;    
      }
      
      public function __set($name,$value){
          $this->data[$name] = $value;
      }
      
      public function assign($name,$value){
          $this->$name = $value;
      }
      
      public function display($template){
          $this->current_template = $template;
          if($this->chk_cache()){
            @extract($this->data);
            include ($this->cache_file);    
          }
          else{
              $this->compile();
          }
      }
      
      private function token($str){
        $tok = strtok($str, $this->delim); 
        while ($tok !== false) {
            $offset = strpos($tok,"\n");
            $ret =  substr($tok,0, $offset);
            $tok = strtok($this->delim);
            $retarr[$ret] = token_get_all("<?php ".$ret."?>");  
        }
        
        return $retarr;
      }
      
      private function parse($str){
        $retarr =  $this->token($str);
        foreach($retarr as $key=>$v){
            $tokenname = @token_name($v[1][0]);
            switch($tokenname){
                case 'T_VARIABLE':
                   $str = str_replace("#$key","<?php echo {$v[1][1]} ?>",$str);
                   break;
                case 'T_INCLUDE':
                    for($i=1;$i<count($v);$i++){
                        if( @token_name($v[$i][0]) == 'T_CONSTANT_ENCAPSED_STRING'){
                            $search = array("'","\"");
                            $subtemp = $this->template_path."/".str_replace($search,"",$v[$i][1]);
                            if(file_exists($subtemp)){
                                $substr = file_get_contents($subtemp);
                                $replacestr = $this->parse($substr);
                            }
                            else if(file_exists($subtemp=$subtemp.$this->template_surfix)) {
                                $substr = file_get_contents($subtemp);
                                $replacestr = $this->parse($substr);
                            }
                            else{
                               $replacestr = ""; 
                            }
                            $str = preg_replace("/#include.*{$v[$i][1]}/i",$replacestr,$str);
                        }
                    }
                    break;
                default:
                   $str = str_replace("#".$key,"<?php $key ?>",$str); 
            }
        }
        return ($str); 
      }
      
      private function compile(){
          $source = file_get_contents($this->template_path."/".$this->current_template.$this->template_surfix);
          $result = $this->parse($source);
          file_put_contents($this->cache_file,$result);
          @extract($this->data);
          include ($this->cache_file);
      }
      
      private function chk_cache(){
          $this->cache_file = $this->template_cache."/".md5($this->current_template).".php";
          if(file_exists($this->cache_file) && time()-filemtime($this->cache_file)<$this->cache_time){
            return true;   
          }
          return false;
      }
  }
?>