LanguageOptions.php

<?php

namespace Drupal\rules\TypedData\Options;

use Drupal\Core\DependencyInjection\ContainerInjectionInterface;
use Drupal\Core\Language\LanguageInterface;
use Drupal\Core\Language\LanguageManagerInterface;
use Drupal\Core\Session\AccountInterface;
use Symfony\Component\DependencyInjection\ContainerInterface;

/**
 * Options provider to list all languages enabled on the site.
 */
class LanguageOptions extends OptionsProviderBase implements ContainerInjectionInterface {
  
  /**
   * The language_manager service.
   *
   * @var \Drupal\Core\Language\LanguageManagerInterface
   */
  protected $languageManager;
  
  /**
   * Constructs a LanguageOptions object.
   *
   * @param \Drupal\Core\Language\LanguageManagerInterface $language_manager
   *   The language_manager service.
   */
  public function __construct(LanguageManagerInterface $language_manager) {
    $this->languageManager = $language_manager;
  }
  
  /**
   * {@inheritdoc}
   */
  public static function create(ContainerInterface $container) {
    return new static($container->get('language_manager'));
  }
  
  /**
   * {@inheritdoc}
   */
  public function getPossibleOptions(AccountInterface $account = NULL) {
    $languages = $this->languageManager
      ->getLanguages(LanguageInterface::STATE_CONFIGURABLE);
    $default = $this->languageManager
      ->getDefaultLanguage()
      ->getId();
    $options = [
      LanguageInterface::LANGCODE_NOT_SPECIFIED => $this->t('Not specified'),
    ];
    foreach ($languages as $langcode => $language) {
      $options[$langcode] = $language->getName() . ($langcode == $default ? ' - default' : '') . ' (' . $langcode . ')';
    }
    // Sort the result by value for ease of locating and selecting.
    asort($options);
    return $options;
  }

}