cshs-8.x-1.x-dev/modules/cshs_menu_link/cshs_menu_link.module

<?php

/**
 * @file
 * Client-side Hierarchical Select: Menu Link.
 */

use Drupal\cshs\Component\CshsOption;
use Drupal\cshs\Element\CshsElement;

/**
 * Implements hook_form_BASE_FORM_ID_alter().
 *
 * @internal
 * @see \menu_ui_form_node_form_alter()
 */
function cshs_menu_link_form_node_form_alter(array &$form): void {
  if (!empty($form['menu']['link']['menu_parent'])) {
    $element =& $form['menu']['link']['menu_parent'];

    // Do not attempt to process CSHS elements produced by someone else.
    /* @link https://www.drupal.org/project/menu_link_weight/issues/3207685 */
    if ($element['#type'] === CshsElement::ID) {
      @\trigger_error(
        'The "cshs_menu_link" functionality suspended because some other application part already transformed the element into the CSHS widget.',
        \E_USER_WARNING,
      );
    }
    else {
      $element['#type'] = CshsElement::ID;
      $element['#attached']['library'][] = 'cshs_menu_link/cshs_menu_link';
      $element['#none_label'] = \t('- Select -');
      $element['#description'] = \t('The menu link is created below the selected menu item. Optionally, select additional levels to place the link deeper in the menu structure.');
      $element['#no_first_level_none'] = TRUE;

      // The first item is always a menu name so the below processing
      // is relevant only if there is at least one link additionally.
      if (\count($element['#options']) > 1) {
        /** @var \Drupal\Core\Menu\MenuLinkManagerInterface $link_manager */
        $link_manager = \Drupal::service('plugin.manager.menu.link');

        foreach ($element['#options'] as $id => $label) {
          // Example `$id` values:
          // - `main:`;
          // - `main:standard.front_page`;
          // - `main:menu_link_content:d5517ae1-925f-4385-96a3-ceca5ad7bb61`.
          [$menu_name, $link_id] = \explode(':', $id, 2);
          // Assume there is no parent until we know that.
          $parent = NULL;

          if ($link_id !== '') {
            if ($link = $link_manager->getDefinition($link_id, FALSE)) {
              // The `parent` is either an empty string or link ID.
              // It is ok to have a parent like `$menu_name:` as it means
              // the link is top-level and its parent is the menu itself.
              $parent = $menu_name . ':' . $link['parent'];
            }
            else {
              \assert(FALSE, \sprintf('The link with ID "%s" must exist!', $link_id));
            }
          }

          $element['#options'][$id] = new CshsOption($label, $parent);
        }
      }
    }
  }
}

/**
 * Implements hook_form_BASE_FORM_ID_alter().
 *
 * @internal
 * @see \taxonomy_menu_ui_form_taxonomy_term_form_alter()
 */
function cshs_menu_link_form_taxonomy_term_form_alter(array &$form): void {
  if (\Drupal::moduleHandler()->moduleExists('taxonomy_menu_ui')) {
    \cshs_menu_link_form_node_form_alter($form);
  }
}