Twig_Environment::getTokenParsers PHP Method

    public function getTokenParsers()
    {
        if (null === $this->parsers) {
            $this->parsers = new Twig_TokenParserBroker;
            foreach ($this->getExtensions() as $extension) {
                $parsers = $extension->getTokenParsers();
                foreach($parsers as $parser) {
                    if ($parser instanceof Twig_TokenParserInterface) {
                        $this->parsers->addTokenParser($parser);
                    } else if ($parser instanceof Twig_TokenParserBrokerInterface) {
                        $this->parsers->addTokenParserBroker($parser);
                    } else {
                        throw new Twig_Error_Runtime('getTokenParsers() must return an array of Twig_TokenParserInterface or Twig_TokenParserBrokerInterface instances');
                    }
                }
            }
        }

        return $this->parsers;
    }