protected $tag;
 
    private $name;
 
    /**
     * Constructor.
     *
     * The nodes are automatically made available as properties ($this->node).
     * The attributes are automatically made available as array items ($this['name']).
     *
     * @param array  $nodes      An array of named nodes
     * @param array  $attributes An array of attributes (should not be nodes)
     * @param int    $lineno     The line number
     * @param string $tag        The tag name associated with the Node
     */
    public function __construct(array $nodes = array(), array $attributes = array(), $lineno = 0, $tag = null)
    {
        foreach ($nodes as $name => $node) {
            if (!$node instanceof self) {
                throw new InvalidArgumentException(sprintf('Using "%s" for the value of node "%s" of "%s" is not supported. You must pass a Twig_Node instance.', is_object($node) ? get_class($node) : null === $node ? 'null' : gettype($node), $name, get_class($this)));
            }
        }
        $this->nodes = $nodes;
        $this->attributes = $attributes;
        $this->lineno = $lineno;
        $this->tag = $tag;
    }
 
    public function __toString()
    {
        $attributes = array();
        foreach ($this->attributes as $name => $value) {
            $attributes[] = sprintf('%s: %s', $name, str_replace("\n", '', var_export($value, true)));
        }
 
        $repr = array(get_class($this).'('.implode(', ', $attributes));
 
        if (count($this->nodes)) {
            foreach ($this->nodes as $name => $node) {
                $len = strlen($name) + 4;