FilterFormat.php

<?php

namespace Drupal\filter\Plugin\DataType;

use Drupal\Core\Session\AccountInterface;
use Drupal\Core\TypedData\OptionsProviderInterface;
use Drupal\Core\TypedData\Plugin\DataType\StringData;

/**
 * The filter format data type.
 *
 * @DataType(
 *   id = "filter_format",
 *   label = @Translation("Filter format")
 * )
 */
class FilterFormat extends StringData implements OptionsProviderInterface {
  
  /**
   * {@inheritdoc}
   */
  public function getPossibleValues(AccountInterface $account = NULL) {
    return array_keys($this->getPossibleOptions($account));
  }
  
  /**
   * {@inheritdoc}
   */
  public function getPossibleOptions(AccountInterface $account = NULL) {
    return array_map(function ($format) {
      return $format->label();
    }, filter_formats());
  }
  
  /**
   * {@inheritdoc}
   */
  public function getSettableValues(AccountInterface $account = NULL) {
    return array_keys($this->getSettableOptions($account));
  }
  
  /**
   * {@inheritdoc}
   */
  public function getSettableOptions(AccountInterface $account = NULL) {
    // @todo: Avoid calling functions but move to injected dependencies.
    return array_map(function ($format) {
      return $format->label();
    }, filter_formats($account));
  }

}