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1 <?php
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2
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3 namespace Drupal\Core\EventSubscriber;
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4
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5 use Drupal\Core\State\StateInterface;
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6 use Drupal\Core\Routing\RouteBuildEvent;
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7 use Drupal\Core\Routing\RoutingEvents;
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8 use Symfony\Component\EventDispatcher\EventSubscriberInterface;
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9
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10 /**
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11 * Provides all available first bits of all route paths.
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12 */
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13 class PathRootsSubscriber implements EventSubscriberInterface {
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14
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15 /**
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16 * Stores the path roots available in the router.
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17 *
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18 * A path root is the first virtual directory of a path, like 'admin', 'node'
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19 * or 'user'.
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20 *
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21 * @var array
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22 */
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23 protected $pathRoots = [];
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24
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25 /**
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26 * The state key value store.
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27 *
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28 * @var \Drupal\Core\State\StateInterface
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29 */
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30 protected $state;
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31
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32 /**
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33 * Constructs a new PathRootsSubscriber instance.
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34 *
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35 * @param \Drupal\Core\State\StateInterface $state
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36 * The state key value store.
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37 */
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38 public function __construct(StateInterface $state) {
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39 $this->state = $state;
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40 }
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41
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42 /**
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43 * Collects all path roots.
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44 *
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45 * @param \Drupal\Core\Routing\RouteBuildEvent $event
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46 * The route build event.
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47 */
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48 public function onRouteAlter(RouteBuildEvent $event) {
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49 $collection = $event->getRouteCollection();
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50 foreach ($collection->all() as $route) {
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51 $bits = explode('/', ltrim($route->getPath(), '/'));
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52 $this->pathRoots[$bits[0]] = $bits[0];
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53 }
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54 }
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55
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56 /**
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57 * {@inheritdoc}
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58 */
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59 public function onRouteFinished() {
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60 $this->state->set('router.path_roots', array_keys($this->pathRoots));
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61 $this->pathRoots = [];
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62 }
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63
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64 /**
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65 * {@inheritdoc}
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66 */
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67 public static function getSubscribedEvents() {
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68 $events = [];
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69 // Try to set a low priority to ensure that all routes are already added.
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70 $events[RoutingEvents::ALTER][] = ['onRouteAlter', -1024];
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71 $events[RoutingEvents::FINISHED][] = ['onRouteFinished'];
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72 return $events;
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73 }
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74
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75 }
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