resourse.php

<?php
class Resource{
	private $_files = array();
	public $type;			//	either css or js
	public $composed_file;	//	name of composed file
	private static $_instances = array();
	
	public function get(){
		return $this->_files;
	}
	
	protected function __construct($type = 'js'){
		$this->type = in_array($type, array('css', 'js')) ? $type : 'js';
	}
	
	public static function instance($type = 'js'){
		if (!isset(self::$_instances[$type]))
			self::$_instances[$type] = new Resource($type);
		return self::$_instances[$type];
	}
	
	public function add($file){
		if (is_array($file)){
			$this->_files = array_merge(array_diff($file, $this->_files), $this->_files);
		}
		elseif (!in_array($file, $this->get())){
			$this->_files[] = $file;
		}
		$a = $this->get();
		sort($a);
		$hash = md5(implode(', ', $a));
		$this->composed_file = "resources/$hash.{$this->type}";
	}

	public function render(){
		if (Kohana::$environment == Kohana::PRODUCTION)
			return View::factory("system/{$this->type}")->set('source', $this->get_composed());
		elseif (Kohana::$environment == Kohana::DEVELOPMENT){
			$res = array();
			foreach($this->get() as $resource){
				$res[] = View::factory("system/{$this->type}")->set('source', $this->type . '/' . $resource . '.' . $this->type);
			}
			return implode('', $res);
		}
	}

	public function get_composed(){
		$files = $this->get();
		if (!file_exists($this->composed_file)){
			$this->compose();
		}
		else{
			$this->check();
		}
		return $this->composed_file;
	}
	
	protected function check(){
		$time = filemtime($this->composed_file);
		$files_to_update = array();
		foreach($this->get() as $file){
			$file_name = "{$this->type}/$file.{$this->type}";
			if (filemtime($file_name) > $time){
				$files_to_update[] = $file;
			};
		}
		if ($files_to_update)
			$this->compose($files_to_update);
	}
	
	protected function compose(array $files_to_update = array()){
		if (file_exists($this->composed_file)) unlink(realpath($this->composed_file));
		foreach($this->get() as $file){
			$resourse_file = 'resources/' . strtolower(str_replace('/', '__', $file) . '.' . $this->type);
			if (!file_exists($resourse_file) OR in_array($file, $files_to_update)){
				$command = "yui-compressor --type {$this->type} -o $resourse_file {$this->type}/$file.{$this->type}";
				echo shell_exec($command);
			}
			$text = file_get_contents($resourse_file);
			file_put_contents($this->composed_file, $text, FILE_APPEND);
			//shell_exec("yui-compressor --type {$this->type} -o {$this->composed_file} {$this->composed_file}");
		}
	}
	
	
}
?>