FieldOptionTranslation.php

<?php

namespace Drupal\field\Plugin\migrate\process\d7;

use Drupal\migrate\Attribute\MigrateProcess;
use Drupal\migrate\MigrateExecutableInterface;
use Drupal\migrate\ProcessPluginBase;
use Drupal\migrate\Row;

/**
 * Determines the allowed values translation for select lists.
 *
 * @deprecated in drupal:11.3.0 and is removed from drupal:12.0.0. There is no
 *   replacement.
 *
 * @see https://www.drupal.org/node/3533560
 */
class FieldOptionTranslation extends ProcessPluginBase {
  public function __construct(array $configuration, $plugin_id, $plugin_definition) {
    @trigger_error(__CLASS__ . ' is deprecated in drupal:11.3.0 and is removed from drupal:12.0.0. There is no replacement. See https://www.drupal.org/node/3533560', E_USER_DEPRECATED);
    parent::__construct($configuration, $plugin_id, $plugin_definition);
  }
  
  /**
   * {@inheritdoc}
   *
   * Get the field default/mapped settings.
   */
  public function transform($value, MigrateExecutableInterface $migrate_executable, Row $row, $destination_property) {
    [$type, $data] = $value;
    $data = unserialize($data);
    $new_allowed_values = '';
    $translation_key = $row->getSourceProperty('property');
    if (isset($data['settings']['allowed_values'])) {
      $allowed_values = $data['settings']['allowed_values'];
      switch ($type) {
        case 'list_string':
        case 'list_integer':
        case 'list_float':
        case 'list_text':
          if (isset($allowed_values[$translation_key])) {
            $new_allowed_values = [
              'label' => $row->getSourceProperty('translation'),
            ];
            $translation_key = array_search($translation_key, array_keys($allowed_values));
            break;

          }
          break;

        default:
          $new_allowed_values = $allowed_values;
      }
    }
    return [
      "settings.allowed_values.{$translation_key}",
      $new_allowed_values,
    ];
  }

}