<?php

/*

 * This file is part of Twig.

 *

 * (c) 2010 Fabien Potencier

 *

 * For the full copyright and license information, please view the LICENSE

 * file that was distributed with this source code.

 */

/**

 * Represents a template function.

 *

 * @package    twig

 * @author     Fabien Potencier <fabien@symfony.com>

 */

abstract class Twig_Function implements Twig_FunctionInterface

{

    protected $options;

    public function __construct(array $options = array())

    {

        $this->options = array_merge(array(

            'needs_environment' => false,

            'needs_context'     => false,

        ), $options);

    }

    public function needsEnvironment()

    {

        return $this->options['needs_environment'];

    }

    public function needsContext()

    {

        return $this->options['needs_context'];

    }

    public function getSafe(Twig_Node $functionArgs)

    {

        if (isset($this->options['is_safe'])) {

            return $this->options['is_safe'];

        }

        if (isset($this->options['is_safe_callback'])) {

            return call_user_func($this->options['is_safe_callback'], $functionArgs);

        }

        return array();

    }

}