<?php

namespace Drupal\Core\Menu;

/**
 * Defines an interface for the active menu trail service.
 *
 * The active trail of a given menu is the trail from the current page to the
 * root of that menu's tree.
 */
interface MenuActiveTrailInterface {

  /**
   * Gets the active trail IDs of the specified menu tree.
   *
   * @param string|null $menu_name
   *   (optional) The menu name of the requested tree. If omitted, all menu
   *   trees will be searched.
   *
   * @return array
   *   An array containing the active trail: a list of plugin IDs.
   */
  public function getActiveTrailIds($menu_name);

  /**
   * Fetches a menu link that matches the currently active route.
   *
   * @param string|null $menu_name
   *   (optional) The menu within which to find the active link. If omitted, all
   *   menus will be searched.
   *
   * @return \Drupal\Core\Menu\MenuLinkInterface|null
   *   The menu link for the currently active route, or NULL if there is no
   *   matching menu link or the current user cannot access the current page
   *   (i.e. we have a 403 response).
   */
  public function getActiveLink($menu_name = NULL);

}