Twig_Environment::addTokenParser PHP Method

    public function addTokenParser(Twig_TokenParserInterface $parser)
    {
        if (null === $this->parsers) {
            $this->getTokenParsers();
        }

        $this->parsers->addTokenParser($parser);
    }

 private function getEnv()
 {
     $env = new \Twig_Environment();
     $env->addTokenParser(new TwigJsTokenParser());
     $env->setLoader(new \Twig_Loader_String());
     return $env;
 }