class YamlFileLoader in Drupal 8

YamlFileLoader loads YAML files service definitions.

Drupal does not use Symfony's Config component, and Symfony's dependency on it cannot be removed easily. Therefore, this is a partial but mostly literal copy of upstream, which does not depend on the Config component.

NOTE: 98% of this code is a literal copy of Symfony's YamlFileLoader.

This file does NOT follow Drupal coding standards, so as to simplify future synchronizations.

Hierarchy

• class \Drupal\Core\DependencyInjection\YamlFileLoader

See also

\Symfony\Component\DependencyInjection\Loader\YamlFileLoader

https://github.com/symfony/symfony/pull/10920

2 files declare their use of YamlFileLoader

DrupalKernel.php in core/lib/Drupal/Core/DrupalKernel.php

YamlFileLoaderTest.php in core/tests/Drupal/Tests/Core/DependencyInjection/YamlFileLoaderTest.php

File

core/lib/Drupal/Core/DependencyInjection/YamlFileLoader.php, line 30

Namespace

Drupal\Core\DependencyInjection

class YamlFileLoader {

  /**
   * @var \Drupal\Core\DependencyInjection\ContainerBuilder $container
   */
  protected $container;

  /**
   * File cache object.
   *
   * @var \Drupal\Component\FileCache\FileCacheInterface
   */
  protected $fileCache;
  public function __construct(ContainerBuilder $container) {
    $this->container = $container;
    $this->fileCache = FileCacheFactory::get('container_yaml_loader');
  }

  /**
   * Loads a Yaml file.
   *
   * @param mixed $file
   *   The resource
   */
  public function load($file) {

    // Load from the file cache, fall back to loading the file.
    $content = $this->fileCache
      ->get($file);
    if (!$content) {
      $content = $this
        ->loadFile($file);
      $this->fileCache
        ->set($file, $content);
    }

    // Not supported.

    //$this->container->addResource(new FileResource($path));

    // empty file
    if (null === $content) {
      return;
    }

    // imports
    // Not supported.

    //$this->parseImports($content, $file);

    // parameters
    if (isset($content['parameters'])) {
      if (!is_array($content['parameters'])) {
        throw new InvalidArgumentException(sprintf('The "parameters" key should contain an array in %s. Check your YAML syntax.', $file));
      }
      foreach ($content['parameters'] as $key => $value) {
        $this->container
          ->setParameter($key, $this
          ->resolveServices($value));
      }
    }

    // extensions
    // Not supported.

    //$this->loadFromExtensions($content);

    // services
    $this
      ->parseDefinitions($content, $file);
  }

  /**
   * Parses definitions
   *
   * @param array $content
   * @param string $file
   */
  private function parseDefinitions($content, $file) {
    if (!isset($content['services'])) {
      return;
    }
    if (!is_array($content['services'])) {
      throw new InvalidArgumentException(sprintf('The "services" key should contain an array in %s. Check your YAML syntax.', $file));
    }

    // Some extensions split up their dependencies into multiple files.
    if (isset($content['_provider'])) {
      $provider = $content['_provider'];
    }
    else {
      $basename = basename($file);
      list($provider, ) = explode('.', $basename, 2);
    }
    foreach ($content['services'] as $id => $service) {
      $service['tags'][] = [
        'name' => '_provider',
        'provider' => $provider,
      ];
      $this
        ->parseDefinition($id, $service, $file);
    }
  }

  /**
   * Parses a definition.
   *
   * @param string $id
   * @param array $service
   * @param string $file
   *
   * @throws InvalidArgumentException
   *   When tags are invalid.
   */
  private function parseDefinition($id, $service, $file) {
    if (is_string($service) && 0 === strpos($service, '@')) {
      $this->container
        ->setAlias($id, substr($service, 1));
      return;
    }
    if (!is_array($service)) {
      throw new InvalidArgumentException(sprintf('A service definition must be an array or a string starting with "@" but %s found for service "%s" in %s. Check your YAML syntax.', gettype($service), $id, $file));
    }
    if (isset($service['alias'])) {
      $public = !array_key_exists('public', $service) || (bool) $service['public'];
      $this->container
        ->setAlias($id, new Alias($service['alias'], $public));
      return;
    }
    if (isset($service['parent'])) {
      $definition = new ChildDefinition($service['parent']);
    }
    else {
      $definition = new Definition();
    }
    if (isset($service['class'])) {
      $definition
        ->setClass($service['class']);
    }
    if (isset($service['shared'])) {
      $definition
        ->setShared($service['shared']);
    }
    if (isset($service['synthetic'])) {
      $definition
        ->setSynthetic($service['synthetic']);
    }
    if (isset($service['lazy'])) {
      $definition
        ->setLazy($service['lazy']);
    }
    if (isset($service['public'])) {
      $definition
        ->setPublic($service['public']);
    }
    if (isset($service['abstract'])) {
      $definition
        ->setAbstract($service['abstract']);
    }
    if (array_key_exists('deprecated', $service)) {
      $definition
        ->setDeprecated(true, $service['deprecated']);
    }
    if (isset($service['factory'])) {
      if (is_string($service['factory'])) {
        if (strpos($service['factory'], ':') !== false && strpos($service['factory'], '::') === false) {
          $parts = explode(':', $service['factory']);
          $definition
            ->setFactory(array(
            $this
              ->resolveServices('@' . $parts[0]),
            $parts[1],
          ));
        }
        else {
          $definition
            ->setFactory($service['factory']);
        }
      }
      else {
        $definition
          ->setFactory(array(
          $this
            ->resolveServices($service['factory'][0]),
          $service['factory'][1],
        ));
      }
    }
    if (isset($service['factory_class'])) {
      $definition
        ->setFactory($service['factory_class']);
    }
    if (isset($service['factory_method'])) {
      $definition
        ->setFactory($service['factory_method']);
    }
    if (isset($service['factory_service'])) {
      $definition
        ->setFactory($service['factory_service']);
    }
    if (isset($service['file'])) {
      $definition
        ->setFile($service['file']);
    }
    if (isset($service['arguments'])) {
      $definition
        ->setArguments($this
        ->resolveServices($service['arguments']));
    }
    if (isset($service['properties'])) {
      $definition
        ->setProperties($this
        ->resolveServices($service['properties']));
    }
    if (isset($service['configurator'])) {
      if (is_string($service['configurator'])) {
        $definition
          ->setConfigurator($service['configurator']);
      }
      else {
        $definition
          ->setConfigurator(array(
          $this
            ->resolveServices($service['configurator'][0]),
          $service['configurator'][1],
        ));
      }
    }
    if (isset($service['calls'])) {
      if (!is_array($service['calls'])) {
        throw new InvalidArgumentException(sprintf('Parameter "calls" must be an array for service "%s" in %s. Check your YAML syntax.', $id, $file));
      }
      foreach ($service['calls'] as $call) {
        if (isset($call['method'])) {
          $method = $call['method'];
          $args = isset($call['arguments']) ? $this
            ->resolveServices($call['arguments']) : array();
        }
        else {
          $method = $call[0];
          $args = isset($call[1]) ? $this
            ->resolveServices($call[1]) : array();
        }
        $definition
          ->addMethodCall($method, $args);
      }
    }
    if (isset($service['tags'])) {
      if (!is_array($service['tags'])) {
        throw new InvalidArgumentException(sprintf('Parameter "tags" must be an array for service "%s" in %s. Check your YAML syntax.', $id, $file));
      }
      foreach ($service['tags'] as $tag) {
        if (!is_array($tag)) {
          throw new InvalidArgumentException(sprintf('A "tags" entry must be an array for service "%s" in %s. Check your YAML syntax.', $id, $file));
        }
        if (!isset($tag['name'])) {
          throw new InvalidArgumentException(sprintf('A "tags" entry is missing a "name" key for service "%s" in %s.', $id, $file));
        }
        $name = $tag['name'];
        unset($tag['name']);
        foreach ($tag as $attribute => $value) {
          if (!is_scalar($value) && null !== $value) {
            throw new InvalidArgumentException(sprintf('A "tags" attribute must be of a scalar-type for service "%s", tag "%s", attribute "%s" in %s. Check your YAML syntax.', $id, $name, $attribute, $file));
          }
        }
        $definition
          ->addTag($name, $tag);
      }
    }
    if (isset($service['decorates'])) {
      $renameId = isset($service['decoration_inner_name']) ? $service['decoration_inner_name'] : null;
      $priority = isset($service['decoration_priority']) ? $service['decoration_priority'] : 0;
      $definition
        ->setDecoratedService($service['decorates'], $renameId, $priority);
    }
    if (isset($service['autowire'])) {
      $definition
        ->setAutowired($service['autowire']);
    }
    if (isset($service['autowiring_types'])) {
      if (is_string($service['autowiring_types'])) {
        $definition
          ->addAutowiringType($service['autowiring_types']);
      }
      else {
        if (!is_array($service['autowiring_types'])) {
          throw new InvalidArgumentException(sprintf('Parameter "autowiring_types" must be a string or an array for service "%s" in %s. Check your YAML syntax.', $id, $file));
        }
        foreach ($service['autowiring_types'] as $autowiringType) {
          if (!is_string($autowiringType)) {
            throw new InvalidArgumentException(sprintf('A "autowiring_types" attribute must be of type string for service "%s" in %s. Check your YAML syntax.', $id, $file));
          }
          $definition
            ->addAutowiringType($autowiringType);
        }
      }
    }
    $this->container
      ->setDefinition($id, $definition);
  }

  /**
   * Loads a YAML file.
   *
   * @param string $file
   *
   * @return array The file content
   *
   * @throws InvalidArgumentException
   *   When the given file is not a local file or when it does not exist.
   */
  protected function loadFile($file) {
    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));
    }
    return $this
      ->validate(Yaml::decode(file_get_contents($file)), $file);
  }

  /**
   * Validates a YAML file.
   *
   * @param mixed $content
   * @param string $file
   *
   * @return array
   *
   * @throws InvalidArgumentException
   *   When service file is not valid.
   */
  private function validate($content, $file) {
    if (null === $content) {
      return $content;
    }
    if (!is_array($content)) {
      throw new InvalidArgumentException(sprintf('The service file "%s" is not valid. It should contain an array. Check your YAML syntax.', $file));
    }
    if ($invalid_keys = array_diff_key($content, array(
      'parameters' => 1,
      'services' => 1,
    ))) {
      throw new InvalidArgumentException(sprintf('The service file "%s" is not valid: it contains invalid keys %s. Services have to be added under "services" and Parameters under "parameters".', $file, $invalid_keys));
    }
    return $content;
  }

  /**
   * Resolves services.
   *
   * @param string|array $value
   *
   * @return array|string|Reference
   */
  private function resolveServices($value) {
    if (is_array($value)) {
      $value = array_map(array(
        $this,
        'resolveServices',
      ), $value);
    }
    elseif (is_string($value) && 0 === strpos($value, '@=')) {

      // Not supported.

      //return new Expression(substr($value, 2));
      throw new InvalidArgumentException(sprintf("'%s' is an Expression, but expressions are not supported.", $value));
    }
    elseif (is_string($value) && 0 === strpos($value, '@')) {
      if (0 === strpos($value, '@@')) {
        $value = substr($value, 1);
        $invalidBehavior = null;
      }
      elseif (0 === strpos($value, '@?')) {
        $value = substr($value, 2);
        $invalidBehavior = ContainerInterface::IGNORE_ON_INVALID_REFERENCE;
      }
      else {
        $value = substr($value, 1);
        $invalidBehavior = ContainerInterface::EXCEPTION_ON_INVALID_REFERENCE;
      }
      if ('=' === substr($value, -1)) {
        $value = substr($value, 0, -1);
        $strict = false;
      }
      else {
        $strict = true;
      }
      if (null !== $invalidBehavior) {
        $value = new Reference($value, $invalidBehavior, $strict);
      }
    }
    return $value;
  }

}

Members

Name	Modifiers	Type	Description	Overrides
YamlFileLoader::$container	protected	property
YamlFileLoader::$fileCache	protected	property	File cache object.
YamlFileLoader::load	public	function	Loads a Yaml file.
YamlFileLoader::loadFile	protected	function	Loads a YAML file.
YamlFileLoader::parseDefinition	private	function	Parses a definition.
YamlFileLoader::parseDefinitions	private	function	Parses definitions
YamlFileLoader::resolveServices	private	function	Resolves services.
YamlFileLoader::validate	private	function	Validates a YAML file.
YamlFileLoader::__construct	public	function