<?php namespace Feather\Extensions;

use Illuminate\Container;

class Extension {

/**

* Laravel application instance.

*

* @var Illuminate\Container

*/

protected $app;

/**

* Create a new extension instance.

*

* @param Illuminate\Container $app

* @return void

*/

public function __construct(Container $app)

{

$this->app = $app;

}

/**

* Listen for an event and fire a method or closure handler.

*

* @param string $event

* @param string|Closure $handler

* @return void

*/

public function listen($event, $handler)

{

$this->bindEvent('listen', $event, $handler);

}

/**

* Overrides existing events listening for an event and fire

* a method or closure handler.

*

* @param string $event

* @param string|Closure $handler

* @return void

*/

public function override($event, $handler)

{

$this->bindEvent('override', $event, $handler);

}

/**

* Binds events for the extension.

*

* @param string $type

* @param string $event

* @param string|Closure $handler

* @return void

*/

private function bindEvent($type, $event, $handler)

{

// Set the current extension instance so we can use it within the event closure.

$extension = $this;

$this->app['events']->$type($event, function($parameters = array()) use ($extension, $handler)

{

// If the handler is a callable closure then we'll execute the closure

// and return its result.

if (is_callable($handler))

{

return $handler($parameters);

}

// Finally assume that the handler is a method on the extension itself.

return call_user_func_array(array($extension, $handler), $parameters);

});

}

}