Search API full name field

Started playing but a bit pointless without anything configured to test and limited in time.

In case someone wants to pick this up, some code below. Absolutely everything is untested.

NameSearchAlterCallback::supportsIndex() was from Metatags implementation but checking fieldable flag.

Add to the file name.search_api.inc

/**
 * @file
 * Contains NameSearchAlterCallback.
 */

/**
 * Implements hook_search_api_alter_callback_info().
 */
function name_search_api_alter_callback_info() {
  return [
    'search_api_name_alter_callback' => [
      'name' => t('Name fields'),
      'description' => t("Adds the item's complete name field to the indexed data."),
      'class' => 'NameSearchAlterCallback',
    ],
  ];
}

/**
 * Only add the class if Search API is installed.
 */
if (class_exists('SearchApiAbstractAlterCallback')) {

  /**
   * Adds complete name field values to the indexed items.
   */
  class NameSearchAlterCallback extends SearchApiAbstractAlterCallback {

    /**
     * {@inheritdoc}
     */
    public function supportsIndex(SearchApiIndex $index) {
      // Check for multiple datasources.
      if (isset($index->item_type) && $index->item_type == 'multiple') {
        // Verify that atleast one datasource type is entity.
        foreach ($index->options['datasource']['types'] as $datasource_type) {
          if ($entity_info = entity_get_info($datasource_type)) {
            if ($entity_info['fieldable']) {
              return TRUE;
            }
          }
        }
      }
      elseif ($entity_type = $index->getEntityType()) {
        if ($entity_info = entity_get_info($entity_type)) {
          if ($entity_info['fieldable']) {
            return TRUE;
          }
        }
      }
      return FALSE;
    }

    /**
     * {@inheritdoc}
     */
    public function alterItems(array &$items) {
      if (isset($this->index->item_type) && $this->index->item_type == 'multiple') {
        foreach ($items as $id => $item) {
          $item_type = $item->item_type;
          if (isset($item->{$item_type})) {
            $entity_item = $item->{$item_type};
            // ....
          }
        }
      }
      else {
        $entity_type = $this->index->getEntityType();
        foreach ($items as $id => $item) {
          // ...
        }
      }
    }

    /**
     * {@inheritdoc}
     */
    public function propertyInfo() {
      $properties = array();
      
      foreach (field_info_field_map() as $field_name => $field) {
        if ($field['type'] == 'name') {
          $name_fields[$field_name] = field_info_field($field_name);
          $properties['name_' . $field_name] = [
            'label' => t('Name field: @label', ['@label' => $field_name]),
            'description' => t('@label attached to an item in default format.', ['@label' => $field_name]),
            'type' => 'text',
          ];          
        }
      }

      return $properties;
    }

  }
}

The name field works with Search API. I tested it.