Optimisez vos fichiers JS et CSS dans Symfony 1

plugins/ulAssetManagerPlugin/config/assets.yml:
  class:    myDevConfigHandler

class clsAssetCss
{
	protected	$sDir,
			$aCompresseurs = array(),
			$aAssetFiles = array();
 
	public function __construct()
	{
		$this->sDir = sfConfig::get('sf_web_dir').'/css/';
		$this->aCompresseurs[] = new Assetic\Filter\Yui\CssCompressorFilter(sfConfig::get('sf_plugins_dir').'/sf2AsseticPlugin/external/yuicompressor.jar');
	}
 
	/**
	 * vérifie l'existence des fichiers et les regroupe dans un tableau de FileAsset
	 * 
	 * @author ulrich, 16/08/11
	 * @param  array $aFiles
	 * @throws clsAssetManagerException si le fichier n'existe pas.
	 */
	public function prepareSource(Array $aFiles)
	{
		for($i = 0, $n = count($aFiles); $i < $n; $i++)
		{
			$sFile = $aFiles[$i];
			if(file_exists($this->sDir.$sFile))
			{
				$this->aAssetFiles[] = new Assetic\Asset\FileAsset($this->sDir.$sFile);
			}
			else
			{
				throw new clsAssetManagerException('Le fichier: '.$this->sDir.$sFile.' n\'extiste pas.');	
			}
		}
	}
 
	/**
	 * Ecrit le fichier unique regroupant tous les assets
	 * 
	 * @author ulrich, 16/08/11
	 * @param  String $sFileName: nom du fichier à écrire
	 */
	public function creerAsset($sFileName)
	{
		$oAssetCol = new Assetic\Asset\AssetCollection($this->aAssetFiles, $this->aCompresseurs);
		$oAssetCol->load();
		$oAssetCol->setTargetPath($sFileName);
 
		$oWriter = new Assetic\AssetWriter($this->sDir);
		$oWriter->writeAsset($oAssetCol);
	}
}

class compressAssetsTask extends sfBaseTask
{
	protected $aConfig;
 
	protected function configure()
	{
		$this->addOption('env', null, sfCommandOption::PARAMETER_OPTIONAL, 'Changes the environment this task is run in', 'prod');
 
		$this->namespace           = 'UL';
		$this->name                = 'compressAssets';
		$this->briefDescription    = 'Compress les Assets';
		$this->detailedDescription = 'Compress les Assets pour l\'environnement de production.';
	}
 
	protected function execute($arguments = array(), $options = array())
	{
		require_once dirname(__FILE__).'/../../../../config/ProjectConfiguration.class.php';
		$configuration = ProjectConfiguration::getApplicationConfiguration('frontend', $options['env'], true);
		sfContext::createInstance($configuration);
 
		$this->aConfig = clsYaml::chargerYamlWithoutCache(dirname(__FIlE__).'/../../config/assets.yml');
 
		$this->compressCss();
 
		return 0;
	}
 
	protected function getSourceEnv()
	{
		if(array_key_exists('dev', $this->aConfig))
			return 'dev';
		elseif(array_key_exists('default', $this->aConfig))
			return 'default';
		elseif(array_key_exists('all', $this->aConfig))
			return 'all';
	}
 
	protected function compressCss()
	{
		$sSource = $this->getSourceEnv();
 
		$oAssetCSS = new clsAssetCss();
 
 
		foreach($this->aConfig[$sSource]['css'] as $sApp => $aFiles)
		{
			try
			{
				$oAssetCSS->prepareSource($aFiles);
			}
			catch(clsAssetManagerException $e)
			{
				$this->logSection('Info:', $e->getMessage());
			}
 
			foreach($this->aConfig as $sEnv => $aConfig)
			{
				if($sEnv == $sSource)
					continue;
 
				if(	array_key_exists('css', $aConfig) && 
					array_key_exists($sApp, $aConfig['css']) && 
					!is_array($aConfig['css'][$sApp]) &&
					null !== $aConfig['css'][$sApp])
				{
					try
					{
						$oAssetCSS->creerAsset($aConfig['css'][$sApp]);
					}
					catch(clsAssetManagerException $e)
					{
						$this->logSection('Info:', $e->getMessage());
					}	
				}
			}
		}
	}
}
 

class clsAssetsLoader
{
	protected static $oInstance;
 
	protected $aConfig;
 
	private function __construct()
	{
		$this->aConfig = clsYaml::chargerYaml('plugins/ulAssetManagerPlugin/config/assets.yml');
		sfContext::getInstance()->getConfiguration()->loadHelpers('Asset');
	}
 
	public static function getInstance()
	{
		if(!self::$oInstance instanceof self)
			self::$oInstance = new self();
 
		return self::$oInstance;
	}
 
	public function getCss($psApp = 'front')
	{
		if(!array_key_exists($psApp, $this->aConfig['css']))
			throw new clsAssetManagerException('L\'application: '.$psApp.' est introuvable pour les CSS.');
 
		if(!$this->aConfig['css'][$psApp])
			return null;
 
		$sHtml = '';
		if(!is_array($this->aConfig['css'][$psApp]))
		{
			$sHtml = stylesheet_tag($this->aConfig['css'][$psApp]);
		}
		else
		{
			for($i = 0, $n = count($this->aConfig['css'][$psApp]); $i < $n; $i++)
			{
				$sHtml .= stylesheet_tag($this->aConfig['css'][$psApp][$i]);
			}
		}
 
		return $sHtml;
	}
 
	public function getJsHead($psApp = 'front')
	{
		if(!array_key_exists($psApp, $this->aConfig['js']))
			throw new clsAssetManagerException('L\'application: '.$psApp.' est introuvable pour les JS.');
 
		return (!$this->aConfig['js'][$psApp]['head'])? null : $this->getJsTag($this->aConfig['js'][$psApp]['head']);
	}
 
	public function getJsFoot($psApp = 'front')
	{
		if(!array_key_exists($psApp, $this->aConfig['js']))
			throw new clsAssetManagerException('L\'application: '.$psApp.' est introuvable pour les JS.');
 
		return (!$this->aConfig['js'][$psApp]['foot'])? null : $this->getJsTag($this->aConfig['js'][$psApp]['foot']);
	}
 
	protected function getJsTag($aFiles)
	{			
		$sHtml = '';
		if(!is_array($aFiles))
		{
			$sHtml = javascript_include_tag($aFiles);
		}
		else
		{
			for($i = 0, $n = count($aFiles); $i < $n; $i++)
			{
				$sHtml .= javascript_include_tag($aFiles[$i]);
			}
		}
 
		return $sHtml;
	}
}

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
  <head>
	<?php include_title() ?>    
	<?php include_http_metas() ?>
    <?php include_metas() ?>
 
	<?php echo clsAssetsLoader::getInstance()->getCss('front');?>
	<?php echo clsAssetsLoader::getInstance()->getJsHead('front');?>
 
 
  </head>
  <body>
.....
 
    <?php echo clsAssetsLoader::getInstance()->getJsFoot('front');?>
 
 
  </body>
</html>