| 1: | <?php declare(strict_types=1); |
| 2: | |
| 3: | namespace Salient\Core\Event; |
| 4: | |
| 5: | use Psr\EventDispatcher\ListenerProviderInterface as PsrListenerProviderInterface; |
| 6: | use Psr\EventDispatcher\StoppableEventInterface as PsrStoppableEventInterface; |
| 7: | use Salient\Contract\Core\Event\EventDispatcherInterface; |
| 8: | use Salient\Contract\Core\HasName; |
| 9: | use Salient\Utility\Reflect; |
| 10: | use Salient\Utility\Str; |
| 11: | use InvalidArgumentException; |
| 12: | use LogicException; |
| 13: | |
| 14: | |
| 15: | |
| 16: | |
| 17: | final class EventDispatcher implements EventDispatcherInterface |
| 18: | { |
| 19: | |
| 20: | |
| 21: | |
| 22: | |
| 23: | |
| 24: | private array $Listeners = []; |
| 25: | |
| 26: | |
| 27: | |
| 28: | |
| 29: | |
| 30: | |
| 31: | private array $EventListeners = []; |
| 32: | |
| 33: | private int $NextListenerId = 0; |
| 34: | private PsrListenerProviderInterface $ListenerProvider; |
| 35: | |
| 36: | |
| 37: | |
| 38: | |
| 39: | public function __construct(?PsrListenerProviderInterface $listenerProvider = null) |
| 40: | { |
| 41: | $this->ListenerProvider = $listenerProvider ?? $this; |
| 42: | } |
| 43: | |
| 44: | |
| 45: | |
| 46: | |
| 47: | public function listen(callable $listener, $event = null): int |
| 48: | { |
| 49: | $this->assertIsListenerProvider(); |
| 50: | |
| 51: | if ($event === null) { |
| 52: | $event = []; |
| 53: | foreach (Reflect::getAcceptedTypes($listener, true) as $name) { |
| 54: | if (is_string($name)) { |
| 55: | $event[] = $name; |
| 56: | } |
| 57: | } |
| 58: | } |
| 59: | |
| 60: | if ($event === []) { |
| 61: | throw new InvalidArgumentException('At least one event must be given'); |
| 62: | } |
| 63: | |
| 64: | $id = $this->NextListenerId++; |
| 65: | foreach ((array) $event as $event) { |
| 66: | $event = Str::lower($event); |
| 67: | $this->Listeners[$id][] = $event; |
| 68: | $this->EventListeners[$event][$id] = $listener; |
| 69: | } |
| 70: | |
| 71: | return $id; |
| 72: | } |
| 73: | |
| 74: | |
| 75: | |
| 76: | |
| 77: | public function dispatch(object $event): object |
| 78: | { |
| 79: | $listeners = $this->ListenerProvider->getListenersForEvent($event); |
| 80: | |
| 81: | foreach ($listeners as $listener) { |
| 82: | if ( |
| 83: | $event instanceof PsrStoppableEventInterface |
| 84: | && $event->isPropagationStopped() |
| 85: | ) { |
| 86: | break; |
| 87: | } |
| 88: | |
| 89: | $listener($event); |
| 90: | } |
| 91: | |
| 92: | return $event; |
| 93: | } |
| 94: | |
| 95: | |
| 96: | |
| 97: | |
| 98: | public function getListenersForEvent(object $event): iterable |
| 99: | { |
| 100: | $this->assertIsListenerProvider(); |
| 101: | |
| 102: | $events = array_merge( |
| 103: | [get_class($event)], |
| 104: | class_parents($event), |
| 105: | class_implements($event), |
| 106: | ); |
| 107: | |
| 108: | if ($event instanceof HasName) { |
| 109: | $events[] = $event->getName(); |
| 110: | } |
| 111: | |
| 112: | $listenersByEvent = array_intersect_key( |
| 113: | $this->EventListeners, |
| 114: | array_change_key_case(array_fill_keys($events, null)), |
| 115: | ); |
| 116: | |
| 117: | $listeners = []; |
| 118: | foreach ($listenersByEvent as $eventListeners) { |
| 119: | $listeners += $eventListeners; |
| 120: | } |
| 121: | |
| 122: | return array_values($listeners); |
| 123: | } |
| 124: | |
| 125: | |
| 126: | |
| 127: | |
| 128: | public function removeListener(int $id): void |
| 129: | { |
| 130: | $this->assertIsListenerProvider(); |
| 131: | |
| 132: | if (!array_key_exists($id, $this->Listeners)) { |
| 133: | throw new InvalidArgumentException('No listener with that ID'); |
| 134: | } |
| 135: | |
| 136: | foreach ($this->Listeners[$id] as $event) { |
| 137: | unset($this->EventListeners[$event][$id]); |
| 138: | if (!$this->EventListeners[$event]) { |
| 139: | unset($this->EventListeners[$event]); |
| 140: | } |
| 141: | } |
| 142: | |
| 143: | unset($this->Listeners[$id]); |
| 144: | } |
| 145: | |
| 146: | private function assertIsListenerProvider(): void |
| 147: | { |
| 148: | if ($this->ListenerProvider !== $this) { |
| 149: | throw new LogicException('Not a listener provider'); |
| 150: | } |
| 151: | } |
| 152: | } |
| 153: | |