diff core/lib/Drupal/Core/EventSubscriber/PathRootsSubscriber.php @ 0:4c8ae668cc8c

Initial import (non-working)

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/core/lib/Drupal/Core/EventSubscriber/PathRootsSubscriber.php	Wed Nov 29 16:09:58 2017 +0000
@@ -0,0 +1,75 @@
+<?php
+
+namespace Drupal\Core\EventSubscriber;
+
+use Drupal\Core\State\StateInterface;
+use Drupal\Core\Routing\RouteBuildEvent;
+use Drupal\Core\Routing\RoutingEvents;
+use Symfony\Component\EventDispatcher\EventSubscriberInterface;
+
+/**
+ * Provides all available first bits of all route paths.
+ */
+class PathRootsSubscriber implements EventSubscriberInterface {
+
+  /**
+   * Stores the path roots available in the router.
+   *
+   * A path root is the first virtual directory of a path, like 'admin', 'node'
+   * or 'user'.
+   *
+   * @var array
+   */
+  protected $pathRoots = [];
+
+  /**
+   * The state key value store.
+   *
+   * @var \Drupal\Core\State\StateInterface
+   */
+  protected $state;
+
+  /**
+   * Constructs a new PathRootsSubscriber instance.
+   *
+   * @param \Drupal\Core\State\StateInterface $state
+   *   The state key value store.
+   */
+  public function __construct(StateInterface $state) {
+    $this->state = $state;
+  }
+
+  /**
+   * Collects all path roots.
+   *
+   * @param \Drupal\Core\Routing\RouteBuildEvent $event
+   *   The route build event.
+   */
+  public function onRouteAlter(RouteBuildEvent $event) {
+    $collection = $event->getRouteCollection();
+    foreach ($collection->all() as $route) {
+      $bits = explode('/', ltrim($route->getPath(), '/'));
+      $this->pathRoots[$bits[0]] = $bits[0];
+    }
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function onRouteFinished() {
+    $this->state->set('router.path_roots', array_keys($this->pathRoots));
+    $this->pathRoots = [];
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function getSubscribedEvents() {
+    $events = [];
+    // Try to set a low priority to ensure that all routes are already added.
+    $events[RoutingEvents::ALTER][] = ['onRouteAlter', -1024];
+    $events[RoutingEvents::FINISHED][] = ['onRouteFinished'];
+    return $events;
+  }
+
+}