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;
    }

}