twig extension

gistfile1.php

class Project_Set_TokenParser extends \Twig_TokenParser
{
    public function parse(\Twig_Token $token)
    {
        $parser = $this->parser;
        $stream = $parser->getStream();

        $name = $stream->expect(\Twig_Token::NAME_TYPE)->getValue();
        $stream->expect(\Twig_Token::OPERATOR_TYPE, '(');
        $value = $parser->getExpressionParser()->parseExpression();
        $stream->expect(\Twig_Token::BLOCK_END_TYPE);

        return new Project_Set_Node($name, $value, $token->getLine(), $this->getTag());
    }

    public function getTag()
    {
        return 'trans';
    }
}

class Project_Set_Node extends \Twig_Node
{
    public function __construct($name, \Twig_Node_Expression $value, $line, $tag = null)
    {
        parent::__construct(array('value' => $value), array('name' => $name), $line, $tag);
    }

    public function compile(\Twig_Compiler $compiler)
    {
        $compiler
            ->addDebugInfo($this)
            ->write('$this->translate(\''.$this->getAttribute('name'))
            ->subcompile($this->getNode('value'))
            ->write('\')')
            ->raw(";\n")
        ;
    }
}










    public function getTokenParsers()
    {
        return array(new Project_Set_TokenParser);
    }