Drupal 8.0.0 beta 12. More info: https://www.drupal.org/node/2514176

core/modules/language/src/LanguageServiceProvider.php

@@ -0,0 +1,106 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\language\LanguageServiceProvider.
+ */
+
+namespace Drupal\language;
+
+use Drupal\Core\Config\BootstrapConfigStorageFactory;
+use Drupal\Core\DependencyInjection\ContainerBuilder;
+use Drupal\Core\DependencyInjection\ServiceProviderBase;
+use Drupal\Core\Language\LanguageInterface;
+use Symfony\Component\DependencyInjection\Reference;
+
+/**
+ * Overrides the language_manager service to point to language's module one.
+ */
+class LanguageServiceProvider extends ServiceProviderBase {
+
+  const CONFIG_PREFIX = 'language.entity.';
+
+  /**
+   * {@inheritdoc}
+   */
+  public function register(ContainerBuilder $container) {
+    // The following services are needed only on multilingual sites.
+    if ($this->isMultilingual()) {
+      $container->register('language_request_subscriber', 'Drupal\language\EventSubscriber\LanguageRequestSubscriber')
+        ->addTag('event_subscriber')
+        ->addArgument(new Reference('language_manager'))
+        ->addArgument(new Reference('language_negotiator'))
+        ->addArgument(new Reference('string_translation'))
+        ->addArgument(new Reference('current_user'));
+
+      $container->register('path_processor_language', 'Drupal\language\HttpKernel\PathProcessorLanguage')
+        ->addTag('path_processor_inbound', array('priority' => 300))
+        ->addTag('path_processor_outbound', array('priority' => 100))
+        ->addArgument(new Reference('config.factory'))
+        ->addArgument(new Reference('language_manager'))
+        ->addArgument(new Reference('language_negotiator'))
+        ->addArgument(new Reference('current_user'));
+    }
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function alter(ContainerBuilder $container) {
+    $definition = $container->getDefinition('language_manager');
+    $definition->setClass('Drupal\language\ConfigurableLanguageManager')
+      ->addArgument(new Reference('config.factory'))
+      ->addArgument(new Reference('module_handler'))
+      ->addArgument(new Reference('language.config_factory_override'))
+      ->addArgument(new Reference('request_stack'));
+    if ($default_language_values = $this->getDefaultLanguageValues()) {
+      $container->setParameter('language.default_values', $default_language_values);
+    }
+
+    // For monolingual sites, we explicitly set the default language for the
+    // language config override service as there is no language negotiation.
+    if (!$this->isMultilingual()) {
+      $container->getDefinition('language.config_factory_override')
+        ->addMethodCall('setLanguageFromDefault', array(new Reference('language.default')));
+    }
+
+  }
+
+  /**
+   * Checks whether the site is multilingual.
+   *
+   * @return bool
+   *   TRUE if the site is multilingual, FALSE otherwise.
+   */
+  protected function isMultilingual() {
+    // Assign the prefix to a local variable so it can be used in an anonymous
+    // function.
+    $prefix = static::CONFIG_PREFIX;
+    // @todo Try to swap out for config.storage to take advantage of database
+    //   and caching. This might prove difficult as this is called before the
+    //   container has finished building.
+    $config_storage = BootstrapConfigStorageFactory::get();
+    $config_ids = array_filter($config_storage->listAll($prefix), function($config_id) use ($prefix) {
+      return $config_id != $prefix . LanguageInterface::LANGCODE_NOT_SPECIFIED && $config_id != $prefix . LanguageInterface::LANGCODE_NOT_APPLICABLE;
+    });
+    return count($config_ids) > 1;
+  }
+
+  /**
+   * Gets the default language values.
+   *
+   * @return array|bool
+   *   Returns the default language values for the language configured in
+   *   system.site:default_langcode if the corresponding configuration entity
+   *   exists, otherwise FALSE.
+   */
+  protected function getDefaultLanguageValues() {
+    $config_storage = BootstrapConfigStorageFactory::get();
+    $system = $config_storage->read('system.site');
+    $default_language = $config_storage->read(static::CONFIG_PREFIX . $system['default_langcode']);
+    if (is_array($default_language)) {
+      return $default_language;
+    }
+    return FALSE;
+  }
+}