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<?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\Component\Translation\Loader;

use Symfony\Component\Translation\Exception\InvalidResourceException;
use Symfony\Component\Translation\Exception\NotFoundResourceException;
use Symfony\Component\Config\Resource\FileResource;
use Symfony\Component\Yaml\Parser as YamlParser;
use Symfony\Component\Yaml\Exception\ParseException;

/**
 * YamlFileLoader loads translations from Yaml files.
 *
 * @author Fabien Potencier <fabien@symfony.com>
 *
 * @api
 */
class YamlFileLoader extends ArrayLoader implements LoaderInterface
{
    private $yamlParser;

/**
     * {@inheritdoc}
     *
     * @api
     */
    public function load($resource, $locale, $domain = 'messages')
    {
        if (!stream_is_local($resource)) {
            throw new InvalidResourceException(sprintf('This is not a local file "%s".', $resource));
        }

if (!file_exists($resource)) {
            throw new NotFoundResourceException(sprintf('File "%s" not found.', $resource));
        }

if (null === $this->yamlParser) {
            $this->yamlParser = new YamlParser();
        }

try {
            $messages = $this->yamlParser->parse(file_get_contents($resource));
        } catch (ParseException $e) {
            throw new InvalidResourceException(sprintf('Error parsing YAML, invalid file "%s"', $resource), 0, $e);
        }

// empty file
        if (null === $messages) {
            $messages = array();
        }

// not an array
        if (!is_array($messages)) {
            throw new InvalidResourceException(sprintf('The file "%s" must contain a YAML array.', $resource));
        }

$catalogue = parent::load($messages, $locale, $domain);
        $catalogue->addResource(new FileResource($resource));

return $catalogue;
    }
}

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