OptionsProviderBase.php

<?php

namespace Drupal\rules\TypedData\Options;

use Drupal\Core\Form\OptGroup;
use Drupal\Core\Session\AccountInterface;
use Drupal\Core\StringTranslation\StringTranslationTrait;
use Drupal\Core\TypedData\OptionsProviderInterface;

/**
 * Base class for options providers used in Rules actions and conditions.
 */
abstract class OptionsProviderBase implements OptionsProviderInterface {
    use StringTranslationTrait;
    
    /**
     * {@inheritdoc}
     */
    public function getPossibleValues(AccountInterface $account = NULL) {
        // Flatten options firstly, because Possible Options may contain group
        // arrays.
        $flatten_options = OptGroup::flattenOptions($this->getPossibleOptions($account));
        return array_keys($flatten_options);
    }
    
    /**
     * {@inheritdoc}
     */
    public function getSettableValues(AccountInterface $account = NULL) {
        return $this->getPossibleValues();
    }
    
    /**
     * {@inheritdoc}
     */
    public function getSettableOptions(AccountInterface $account = NULL) {
        return $this->getPossibleOptions();
    }

}