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<?php |
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declare(strict_types=1); |
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namespace Jasny\EventDispatcher; |
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use Improved\IteratorPipeline\Pipeline; |
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use Psr\EventDispatcher\ListenerProviderInterface; |
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/** |
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* Event dispatcher. |
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* @immutable |
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*/ |
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class ListenerProvider implements ListenerProviderInterface |
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{ |
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/** |
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* @var array |
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*/ |
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protected $listeners = []; |
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/** |
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* Bind a handler for an event. |
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* |
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* @param string $eventName |
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* @param callable $listener |
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* @return static |
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*/ |
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public function on(string $eventName, callable $listener): self |
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{ |
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if (strpos($eventName, '*') !== false) { |
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throw new \InvalidArgumentException("Invalid event name '$eventName': illegal character '*'"); |
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} |
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$clone = clone $this; |
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$clone->listeners[] = ['event' => $eventName, 'listener' => $listener]; |
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return $clone; |
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} |
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/** |
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* Unbind a handler of an event. |
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* |
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* @param string $eventName Event name, optionally with wildcards |
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* @return $this |
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*/ |
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public function off(string $eventName): self |
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{ |
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$listeners = Pipeline::with($this->listeners) |
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->filter(function ($trigger) use ($eventName) { |
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return !fnmatch($eventName, $trigger['event'], FNM_NOESCAPE) |
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&& !fnmatch("$eventName.*", $trigger['event'], FNM_NOESCAPE); |
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}) |
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->values() |
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->toArray(); |
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if (count($listeners) === count($this->listeners)) { |
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return $this; |
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} |
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$clone = clone $this; |
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$clone->listeners = $listeners; |
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return $clone; |
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} |
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/** |
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* Get the relevant listeners for the given event |
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* |
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* @param object $event |
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* @return callable[] |
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*/ |
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public function getListenersForEvent(object $event): iterable |
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{ |
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$eventName = $event instanceof Event ? $event->getName() : null; |
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return Pipeline::with($this->listeners) |
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->filter(function ($trigger) use ($event, $eventName) { |
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return is_a($event, $trigger['event']) |
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|| $eventName === $trigger['event'] |
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|| ($eventName !== null && fnmatch("{$eventName}.*", $trigger['event'], FNM_NOESCAPE)); |
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}) |
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->column('listener') |
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->values() |
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->toArray(); |
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} |
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} |
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jasny /
event-dispatcher
