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<?php |
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namespace Carbon_Fields\Event; |
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class Emitter { |
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protected $listeners = array(); |
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/** |
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* Broadcast an event |
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* |
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* @return mixed |
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*/ |
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public function emit() { |
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$args = func_get_args(); |
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$event = $args[0]; |
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$args = array_slice( $args, 1 ); |
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$listeners = $this->get_listeners( $event ); |
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foreach ( $listeners as $listener ) { |
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if ( $listener->is_valid() ) { |
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call_user_func_array( array( $listener, 'notify' ), $args ); |
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} |
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} |
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$this->remove_invalid_listeners( $event ); |
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} |
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/** |
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* Get array of events with registered listeners |
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* |
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* @return array<string> |
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*/ |
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protected function get_events() { |
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$events_with_listeners = array_filter( $this->listeners ); |
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$events = array_keys( $events_with_listeners ); |
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return $events; |
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} |
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/** |
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* Get array of listenrs for a specific event |
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* |
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* @param string $event Event to get listeners for |
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* @return array<Listener> |
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*/ |
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protected function get_listeners( $event ) { |
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$listeners = isset( $this->listeners[ $event ] ) ? $this->listeners[ $event ] : array(); |
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return $listeners; |
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} |
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/** |
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* Remove invalid listeners from an event |
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* |
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* @param string $event |
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*/ |
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protected function remove_invalid_listeners( $event ) { |
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$listeners = $this->get_listeners( $event ); |
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if ( empty( $listeners ) ) { |
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return; |
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} |
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$this->listeners[ $event ] = array_filter( $listeners, function( $listener ) { |
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return $listener->is_valid(); |
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} ); |
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} |
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/** |
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* Add a listener to an event |
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* |
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* @param string $event |
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* @return Listener $listener |
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*/ |
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public function add_listener( $event, $listener ) { |
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if ( ! isset( $this->listeners[ $event ] ) ) { |
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$this->listeners[ $event ] = array(); |
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} |
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$this->listeners[ $event ][] = $listener; |
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return $listener; |
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} |
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/** |
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* Remove a listener from any event |
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* |
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* @param Listener $removed_listener |
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*/ |
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public function remove_listener( $removed_listener ) { |
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$events = $this->get_events(); |
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foreach ( $events as $event ) { |
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$listeners = $this->get_listeners( $event ); |
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$filtered_listeners = array_filter( $listeners, function( $listener ) use ( $removed_listener ) { |
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return ( $listener !== $removed_listener ); |
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} ); |
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$this->listeners[ $event ] = $filtered_listeners; |
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} |
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} |
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/** |
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* Add a persistent listener to an event |
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* |
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* @param string $event The event to listen for |
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* @param string $callable The callable to call when the event is broadcasted |
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* @return Listener |
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*/ |
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public function on( $event, $callable ) { |
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$listener = \Carbon_Fields\Carbon_Fields::resolve( 'event_persistent_listener' ); |
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$listener->set_callable( $callable ); |
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return $this->add_listener( $event, $listener ); |
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} |
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/** |
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* Add a one-time listener to an event |
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* |
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* @param string $event The event to listen for |
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* @param string $callable The callable to call when the event is broadcasted |
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* @return Listener |
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*/ |
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public function once( $event, $callable ) { |
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$listener = \Carbon_Fields\Carbon_Fields::resolve( 'event_single_event_listener' ); |
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$listener->set_callable( $callable ); |
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return $this->add_listener( $event, $listener ); |
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} |
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} |
htmlburger /
carbon-fields
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Very long variable names usually make code harder to read. It is therefore recommended not to make variable names too verbose.