<?php

/*

 * This file is part of the Symfony package.

 *

 * (c) Fabien Potencier <fabien@symfony.com>

 *

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

 * file that was distributed with this source code.

 */

namespace Symfony\Bundle\TwigBundle\Loader;

use Symfony\Component\Templating\TemplateNameParserInterface;

use Symfony\Component\Config\FileLocatorInterface;

/**

 * FilesystemLoader extends the default Twig filesystem loader

 * to work with the Symfony2 paths.

 *

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

 */

class FilesystemLoader extends \Twig_Loader_Filesystem

{

    protected $locator;

    protected $parser;

    /**

     * Constructor.

     *

     * @param FileLocatorInterface        $locator A FileLocatorInterface instance

     * @param TemplateNameParserInterface $parser  A TemplateNameParserInterface instance

     */

    public function __construct(FileLocatorInterface $locator, TemplateNameParserInterface $parser)

    {

        $this->locator = $locator;

        $this->parser = $parser;

        $this->cache = array();

    }

    /**

     * Returns the path to the template file.

     *

     * The file locator is used to locate the template when the naming convention

     * is the symfony one (i.e. the name can be parsed).

     * Otherwise the template is located using the locator from the twig library.

     *

     * @param string|TemplateReferenceInterface $template The template

     *

     * @return string The path to the template file

     *

     * @throws \Twig_Error_Loader if the template could not be found

     */

    protected function findTemplate($template)

    {

        $logicalName = (string) $template;

        if (isset($this->cache[$logicalName])) {

            return $this->cache[$logicalName];

        }

        $file = null;

        $previous = null;

        try {

            $template = $this->parser->parse($template);

            try {

                $file = $this->locator->locate($template);

            } catch (\InvalidArgumentException $e) {

                $previous = $e;

            }

        } catch (\Exception $e) {

            try {

                $file = parent::findTemplate($template);

            } catch (\Twig_Error_Loader $e) {

                $previous = $e;

            }

        }

        if (false === $file || null === $file) {

            throw new \Twig_Error_Loader(sprintf('Unable to find template "%s".', $logicalName), -1, null, $previous);

        }

        return $this->cache[$logicalName] = $file;

    }

}