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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 as i; |
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use Improved\IteratorPipeline\Pipeline; |
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use function Jasny\str_contains; |
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/** |
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* Event dispatcher. |
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* @immutable |
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*/ |
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class EventDispatcher |
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{ |
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/** |
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* @var array |
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*/ |
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protected $triggers = []; |
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/** |
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* Bind a handler for an event. |
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* |
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* @param string $event |
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* @param callable $handler |
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* @return static |
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*/ |
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public function on(string $event, callable $handler): self |
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{ |
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if (str_contains($event, '*')) { |
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throw new \InvalidArgumentException("Invalid event name '$event': illegal character '*'"); |
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} |
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$clone = clone $this; |
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$clone->triggers[] = ['event' => $event, 'handler' => $handler]; |
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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 $event Event name, optionally with wildcards |
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* @return $this |
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*/ |
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public function off(string $event): self |
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{ |
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$triggers = Pipeline::with($this->triggers) |
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->filter(function ($trigger) use ($event) { |
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return !fnmatch($event, $trigger['event'], FNM_NOESCAPE) |
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&& !fnmatch("$event.*", $trigger['event'], FNM_NOESCAPE); |
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}) |
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->values() |
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->toArray(); |
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if (count($triggers) === count($this->triggers)) { |
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return $this; |
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} |
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$clone = clone $this; |
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$clone->triggers = $triggers; |
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return $clone; |
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} |
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/** |
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* Trigger an event. |
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* |
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* @param string $event |
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* @param object $subject |
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* @param mixed $payload |
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* @return mixed |
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*/ |
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public function trigger(string $event, $subject, $payload = null) |
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{ |
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return Pipeline::with($this->triggers) |
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->filter(function ($trigger) use ($event) { |
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return $event === $trigger['event'] || fnmatch("{$event}.*", $trigger['event'], FNM_NOESCAPE); |
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}) |
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->column('handler') |
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->reduce(function ($payload, $handler) use ($subject) { |
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return i\function_call($handler, $subject, $payload); |
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}, $payload); |
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} |
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} |
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jasny /
event-dispatcher
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