/**
  * @return bool|sfYaml
  */
 protected function getSymfonyYamlParser()
 {
     if (!isset(self::$oYaml)) {
         if ($this->loadSymfonyYamlParser()) {
             self::$oYaml = new sfYaml();
         } else {
             self::$oYaml = false;
         }
     }
     return self::$oYaml;
 }