Symfony\Component\DependencyInjection\Loader\YamlFileLoader::loadFile PHP Method

    protected function loadFile($file)
    {
        if (!class_exists('Symfony\Component\Yaml\Parser')) {
            throw new RuntimeException('Unable to load YAML config files as the Symfony Yaml Component is not installed.');
        }

        if (!stream_is_local($file)) {
            throw new InvalidArgumentException(sprintf('This is not a local file "%s".', $file));
        }

        if (!file_exists($file)) {
            throw new InvalidArgumentException(sprintf('The service file "%s" is not valid.', $file));
        }

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

        try {
            $configuration = $this->yamlParser->parse(file_get_contents($file), Yaml::PARSE_CONSTANT);
        } catch (ParseException $e) {
            throw new InvalidArgumentException(sprintf('The file "%s" does not contain valid YAML.', $file), 0, $e);
        }

        return $this->validate($configuration, $file);
    }

 public function loadFile($file)
 {
     return parent::loadFile($file);
 }