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<?php |
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/** |
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* Nucleus - XMPP Library for PHP |
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* |
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* Copyright (C) 2016, Some rights reserved. |
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* |
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* @author Kacper "Kadet" Donat <[email protected]> |
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* |
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* Contact with author: |
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* Xmpp: [email protected] |
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* E-mail: [email protected] |
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* |
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* From Kadet with love. |
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*/ |
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namespace Kadet\Xmpp\Utils; |
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use Kadet\Xmpp\Utils\filter as with; |
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use Evenement\EventEmitterTrait; |
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trait BetterEmitter |
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{ |
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/** |
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* @var PriorityCollection[] |
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*/ |
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protected $listeners; |
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use EventEmitterTrait; |
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public function on($event, callable $listener, $condition = null, int $priority = 0) |
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{ |
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return $this->addListener($event, $this->getConditionalCallable($listener, $condition), $priority); |
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} |
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public function once($event, callable $listener, $condition = null, int $priority = 0) |
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{ |
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return $this->on($event, $this->getOnceCallable($this->getConditionalCallable($listener, $condition), $event), null, $priority); |
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} |
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public function removeListener($event, callable $listener) |
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{ |
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if (!isset($this->listeners[$event])) { |
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return false; |
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} |
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$this->listeners[$event]->remove($listener); |
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return true; |
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} |
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public function emit($event, array $arguments = []) |
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{ |
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foreach ($this->listeners($event) as $listener) { |
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try { |
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if ($listener(...$arguments) === false) { |
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return false; |
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} |
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} catch (\Throwable $exception) { |
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if($this->emit('exception', [ $exception, $event ])) { |
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throw $exception; |
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} |
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return false; |
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} |
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} |
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return true; |
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} |
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public function reference(callable $callable, int $position = 0) : callable |
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{ |
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return \Kadet\Xmpp\Utils\helper\partial($callable, $this, $position); |
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} |
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private function addListener($event, callable $listener, int $priority = 0) |
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{ |
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if (!isset($this->listeners[$event])) { |
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$this->listeners[$event] = new PriorityCollection(); |
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} |
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$this->listeners[$event]->insert($listener, $priority); |
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return $listener; |
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} |
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private function getConditionalCallable(callable $listener, $condition) : callable |
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{ |
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if ($condition === null) { |
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return $listener; |
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} |
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$condition = with\predicate($condition); |
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return function (...$arguments) use ($listener, $condition) { |
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if ($condition(...$arguments)) { |
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return (bool)$listener(...$arguments); |
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} |
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return null; |
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}; |
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} |
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private function getOnceCallable(callable $listener, $event) : callable |
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{ |
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return $onceListener = function (...$arguments) use (&$onceListener, $event, $listener) { |
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if(($result = $listener(...$arguments)) !== null) { |
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$this->removeListener($event, $onceListener); |
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return $result; |
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} |
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return null; |
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}; |
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} |
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} |
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kadet1090 /
nucleus
This check looks for variable assignements that are either overwritten by other assignments or where the variable is not used subsequently.
Both the
$myVarassignment in line 1 and the$higherassignment in line 2 are dead. The first because$myVaris never used and the second because$higheris always overwritten for every possible time line.