diff core/lib/Drupal/Core/Menu/MenuActiveTrail.php @ 0:4c8ae668cc8c

Initial import (non-working)

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/core/lib/Drupal/Core/Menu/MenuActiveTrail.php	Wed Nov 29 16:09:58 2017 +0000
@@ -0,0 +1,143 @@
+<?php
+
+namespace Drupal\Core\Menu;
+
+use Drupal\Core\Cache\CacheBackendInterface;
+use Drupal\Core\Cache\CacheCollector;
+use Drupal\Core\Lock\LockBackendInterface;
+use Drupal\Core\Routing\RouteMatchInterface;
+
+/**
+ * Provides the default implementation of the active menu trail service.
+ *
+ * It uses the current route name and route parameters to compare with the ones
+ * of the menu links.
+ */
+class MenuActiveTrail extends CacheCollector implements MenuActiveTrailInterface {
+
+  /**
+   * The menu link plugin manager.
+   *
+   * @var \Drupal\Core\Menu\MenuLinkManagerInterface
+   */
+  protected $menuLinkManager;
+
+  /**
+   * The route match object for the current page.
+   *
+   * @var \Drupal\Core\Routing\RouteMatchInterface
+   */
+  protected $routeMatch;
+
+  /**
+   * Constructs a \Drupal\Core\Menu\MenuActiveTrail object.
+   *
+   * @param \Drupal\Core\Menu\MenuLinkManagerInterface $menu_link_manager
+   *   The menu link plugin manager.
+   * @param \Drupal\Core\Routing\RouteMatchInterface $route_match
+   *   A route match object for finding the active link.
+   * @param \Drupal\Core\Cache\CacheBackendInterface $cache
+   *   The cache backend.
+   * @param \Drupal\Core\Lock\LockBackendInterface $lock
+   *   The lock backend.
+   */
+  public function __construct(MenuLinkManagerInterface $menu_link_manager, RouteMatchInterface $route_match, CacheBackendInterface $cache, LockBackendInterface $lock) {
+    parent::__construct(NULL, $cache, $lock);
+    $this->menuLinkManager = $menu_link_manager;
+    $this->routeMatch = $route_match;
+  }
+
+  /**
+   * {@inheritdoc}
+   *
+   * @see ::getActiveTrailIds()
+   */
+  protected function getCid() {
+    if (!isset($this->cid)) {
+      $route_parameters = $this->routeMatch->getRawParameters()->all();
+      ksort($route_parameters);
+      return 'active-trail:route:' . $this->routeMatch->getRouteName() . ':route_parameters:' . serialize($route_parameters);
+    }
+
+    return $this->cid;
+  }
+
+  /**
+   * {@inheritdoc}
+   *
+   * @see ::getActiveTrailIds()
+   */
+  protected function resolveCacheMiss($menu_name) {
+    $this->storage[$menu_name] = $this->doGetActiveTrailIds($menu_name);
+    $this->tags[] = 'config:system.menu.' . $menu_name;
+    $this->persist($menu_name);
+
+    return $this->storage[$menu_name];
+  }
+
+  /**
+   * {@inheritdoc}
+   *
+   * This implementation caches all active trail IDs per route match for *all*
+   * menus whose active trails are calculated on that page. This ensures 1 cache
+   * get for all active trails per page load, rather than N.
+   *
+   * It uses the cache collector pattern to do this.
+   *
+   * @see ::get()
+   * @see \Drupal\Core\Cache\CacheCollectorInterface
+   * @see \Drupal\Core\Cache\CacheCollector
+   */
+  public function getActiveTrailIds($menu_name) {
+    return $this->get($menu_name);
+  }
+
+  /**
+   * Helper method for ::getActiveTrailIds().
+   */
+  protected function doGetActiveTrailIds($menu_name) {
+    // Parent ids; used both as key and value to ensure uniqueness.
+    // We always want all the top-level links with parent == ''.
+    $active_trail = ['' => ''];
+
+    // If a link in the given menu indeed matches the route, then use it to
+    // complete the active trail.
+    if ($active_link = $this->getActiveLink($menu_name)) {
+      if ($parents = $this->menuLinkManager->getParentIds($active_link->getPluginId())) {
+        $active_trail = $parents + $active_trail;
+      }
+    }
+
+    return $active_trail;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getActiveLink($menu_name = NULL) {
+    // Note: this is a very simple implementation. If you need more control
+    // over the return value, such as matching a prioritized list of menu names,
+    // you should substitute your own implementation for the 'menu.active_trail'
+    // service in the container.
+    // The menu links coming from the storage are already sorted by depth,
+    // weight and ID.
+    $found = NULL;
+
+    $route_name = $this->routeMatch->getRouteName();
+    // On a default (not custom) 403 page the route name is NULL. On a custom
+    // 403 page we will get the route name for that page, so we can consider
+    // it a feature that a relevant menu tree may be displayed.
+    if ($route_name) {
+      $route_parameters = $this->routeMatch->getRawParameters()->all();
+
+      // Load links matching this route.
+      $links = $this->menuLinkManager->loadLinksByRoute($route_name, $route_parameters, $menu_name);
+      // Select the first matching link.
+      if ($links) {
+        $found = reset($links);
+      }
+    }
+    return $found;
+  }
+
+}