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<?php /** * This file is part of the Peast package * * (c) Marco Marchiò <marco.mm89@gmail.com> * * For the full copyright and license information refer to the LICENSE file * distributed with this source code */ namespace Peast\Syntax; /** * Events emitter class. An instance of this class is used by Parser and Scanner * to emit events and attach listeners to them * * @author Marco Marchiò <marco.mm89@gmail.com> */ class EventsEmitter { /** * Events registry array * * @var array */ protected $eventsRegistry = array(); /** * Attaches a listener function to the given event * * @param string $event Event name * @param callable $listener Listener function * * @return $this */ public function addListener($event, $listener) { if (!isset($this->eventsRegistry[$event])) { $this->eventsRegistry[$event] = array(); } $this->eventsRegistry[$event][] = $listener; return $this; } /** * Fires an event * * @param string $event Event name * @param array $args Arguments to pass to functions attached to the * event * * @return $this */ public function fire($event, $args = array()) { if (isset($this->eventsRegistry[$event])) { foreach ($this->eventsRegistry[$event] as $listener) { call_user_func_array($listener, $args); } } return $this; } }
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