<?php

/**

 * Widget API: WP_Widget_Factory class

 *

 * @package WordPress

 * @subpackage Widgets

 * @since 4.4.0

 */

/**

 * Singleton that registers and instantiates WP_Widget classes.

 *

 * @since 2.8.0

 * @since 4.4.0 Moved to its own file from wp-includes/widgets.php

 */

class WP_Widget_Factory {

	/**

	 * Widgets array.

	 *

	 * @since 2.8.0

	 * @var array

	 */

	public $widgets = array();

	/**

	 * PHP5 constructor.

	 *

	 * @since 4.3.0

	 */

	public function __construct() {

		add_action( 'widgets_init', array( $this, '_register_widgets' ), 100 );

	}

	/**

	 * PHP4 constructor.

	 *

	 * @since 2.8.0

	 * @deprecated 4.3.0 Use __construct() instead.

	 *

	 * @see WP_Widget_Factory::__construct()

	 */

	public function WP_Widget_Factory() {

		_deprecated_constructor( 'WP_Widget_Factory', '4.3.0' );

		self::__construct();

	}

	/**

	 * Registers a widget subclass.

	 *

	 * @since 2.8.0

	 * @since 4.6.0 Updated the `$widget` parameter to also accept a WP_Widget instance object

	 *              instead of simply a `WP_Widget` subclass name.

	 *

	 * @param string|WP_Widget $widget Either the name of a `WP_Widget` subclass or an instance of a `WP_Widget` subclass.

	 */

	public function register( $widget ) {

		if ( $widget instanceof WP_Widget ) {

			$this->widgets[ spl_object_hash( $widget ) ] = $widget;

		} else {

			$this->widgets[ $widget ] = new $widget();

		}

	}

	/**

	 * Un-registers a widget subclass.

	 *

	 * @since 2.8.0

	 * @since 4.6.0 Updated the `$widget` parameter to also accept a WP_Widget instance object

	 *              instead of simply a `WP_Widget` subclass name.

	 *

	 * @param string|WP_Widget $widget Either the name of a `WP_Widget` subclass or an instance of a `WP_Widget` subclass.

	 */

	public function unregister( $widget ) {

		if ( $widget instanceof WP_Widget ) {

			unset( $this->widgets[ spl_object_hash( $widget ) ] );

		} else {

			unset( $this->widgets[ $widget ] );

		}

	}

	/**

	 * Serves as a utility method for adding widgets to the registered widgets global.

	 *

	 * @since 2.8.0

	 *

	 * @global array $wp_registered_widgets

	 */

	public function _register_widgets() {

		global $wp_registered_widgets;

		$keys       = array_keys( $this->widgets );

		$registered = array_keys( $wp_registered_widgets );

		$registered = array_map( '_get_widget_id_base', $registered );

		foreach ( $keys as $key ) {

			// Don't register new widget if old widget with the same id is already registered.

			if ( in_array( $this->widgets[ $key ]->id_base, $registered, true ) ) {

				unset( $this->widgets[ $key ] );

				continue;

			}

			$this->widgets[ $key ]->_register();

		}

	}

}