vendor/symfony/symfony/src/Symfony/Component/Serializer/Mapping/Loader/YamlFileLoader.php

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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\Serializer\Mapping\Loader;

use Symfony\Component\Serializer\Exception\MappingException;
use Symfony\Component\Serializer\Mapping\AttributeMetadata;
use Symfony\Component\Serializer\Mapping\ClassMetadataInterface;
use Symfony\Component\Yaml\Parser;

/**
 * YAML File Loader.
 *
 * @author Kévin Dunglas <dunglas@gmail.com>
 */
class YamlFileLoader extends FileLoader
{
    private $yamlParser;

    /**
     * An array of YAML class descriptions.
     *
     * @var array
     */
    private $classes = null;

    /**
     * {@inheritdoc}
     */
    public function loadClassMetadata(ClassMetadataInterface $classMetadata)
    {
        if (null === $this->classes) {
            if (!stream_is_local($this->file)) {
                throw new MappingException(sprintf('This is not a local file "%s".', $this->file));
            }

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

            $classes = $this->yamlParser->parse(file_get_contents($this->file));

            if (empty($classes)) {
                return false;
            }

            // not an array
            if (!is_array($classes)) {
                throw new MappingException(sprintf('The file "%s" must contain a YAML array.', $this->file));
            }

            $this->classes = $classes;