1<?php
2
3/*
4 * This file is part of the Symfony package.
5 *
6 * (c) Fabien Potencier <fabien@symfony.com>
7 *
8 * For the full copyright and license information, please view the LICENSE
9 * file that was distributed with this source code.
10 */
11
12namespace Symfony\Component\Translation\Loader;
13
14use Symfony\Component\Translation\Exception\InvalidResourceException;
15use Symfony\Component\Translation\Exception\LogicException;
16use Symfony\Component\Yaml\Exception\ParseException;
17use Symfony\Component\Yaml\Parser as YamlParser;
18use Symfony\Component\Yaml\Yaml;
19
20/**
21 * YamlFileLoader loads translations from Yaml files.
22 *
23 * @author Fabien Potencier <fabien@symfony.com>
24 */
25class YamlFileLoader extends FileLoader
26{
27    private $yamlParser;
28
29    /**
30     * {@inheritdoc}
31     */
32    protected function loadResource($resource)
33    {
34        if (null === $this->yamlParser) {
35            if (!class_exists(\Symfony\Component\Yaml\Parser::class)) {
36                throw new LogicException('Loading translations from the YAML format requires the Symfony Yaml component.');
37            }
38
39            $this->yamlParser = new YamlParser();
40        }
41
42        try {
43            $messages = $this->yamlParser->parseFile($resource, Yaml::PARSE_CONSTANT);
44        } catch (ParseException $e) {
45            throw new InvalidResourceException(sprintf('The file "%s" does not contain valid YAML: ', $resource).$e->getMessage(), 0, $e);
46        }
47
48        if (null !== $messages && !\is_array($messages)) {
49            throw new InvalidResourceException(sprintf('Unable to load file "%s".', $resource));
50        }
51
52        return $messages ?: [];
53    }
54}
55