public function __construct(Twig_Loader $loader = null, Twig_Environment $environment = null)
{
parent::__construct($loader, $environment);
$this->environment->addExtension(new opTwigCoreExtension());
if (sfConfig::get('op_is_restrict_mail_template', true)) {
$policy = new opTwigSandboxSecurityPolicy();
$this->environment->addExtension(new Twig_Extension_Sandbox($policy, true));
}
$this->environment->addExtension(new HelperTwigExtension());
}
