EventsEmitter.php
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EventsEmitter.php
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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;
	}
	}