<?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

	 */

	public function WP_Widget_Factory() {

		_deprecated_constructor( 'WP_Widget_Factory', '4.2.0' );

		self::__construct();

	}

	/**

	 * Memory for the number of times unique class instances have been hashed.

	 *

	 * This can be eliminated in favor of straight spl_object_hash() when 5.3

	 * is the minimum requirement for PHP.

	 *

	 * @since 4.6.0

	 * @var array

	 *

	 * @see WP_Widget_Factory::hash_object()

	 */

	private $hashed_class_counts = array();

	/**

	 * Hashes an object, doing fallback of `spl_object_hash()` if not available.

	 *

	 * This can be eliminated in favor of straight spl_object_hash() when 5.3

	 * is the minimum requirement for PHP.

	 *

	 * @since 4.6.0

	 *

	 * @param WP_Widget $widget Widget.

	 * @return string Object hash.

	 */

	private function hash_object( $widget ) {

		if ( function_exists( 'spl_object_hash' ) ) {

			return spl_object_hash( $widget );

		} else {

			$class_name = get_class( $widget );

			if ( ! isset( $widget->_wp_widget_factory_hash_id ) ) {

				if ( ! isset( $this->hashed_class_counts[ $class_name ] ) ) {

					$this->hashed_class_counts[ $class_name ] = 0;

				}

				$this->hashed_class_counts[ $class_name ] += 1;

			}

			$hash .= ':' . $widget->_wp_widget_factory_hash_id;

			return $hash;

		}

	}

	/**

	 * 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[ $this->hash_object( $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[ $this->hash_object( $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;

		foreach ( $keys as $key ) {

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

				continue;

			}

		}

	}

}