<?php

/**

 * BackPress Scripts Procedural API

 *

 * @since 2.6.0

 *

 * @package WordPress

 * @subpackage BackPress

 */

/**

 * Print scripts in document head that are in the $handles queue.

 *

 * Called by admin-header.php and wp_head hook. Since it is called by wp_head on every page load,

 * the function does not instantiate the WP_Scripts object unless script names are explicitly passed.

 * Makes use of already-instantiated $wp_scripts global if present. Use provided wp_print_scripts

 * hook to register/enqueue new scripts.

 *

 * @see WP_Scripts::do_items()

 * @global WP_Scripts $wp_scripts The WP_Scripts object for printing scripts.

 *

 * @since 2.6.0

 *

 * @param array|bool $handles Optional. Scripts to be printed. Default 'false'.

 * @return array On success, a processed array of WP_Dependencies items; otherwise, an empty array.

 */

function wp_print_scripts( $handles = false ) {

	do_action( 'wp_print_scripts' );

	if ( '' === $handles ) // for wp_head

		$handles = false;

	global $wp_scripts;

	if ( ! is_a( $wp_scripts, 'WP_Scripts' ) ) {

		if ( ! did_action( 'init' ) )

			_doing_it_wrong( __FUNCTION__, sprintf( __( 'Scripts and styles should not be registered or enqueued until the %1$s, %2$s, or %3$s hooks.' ),

				'<code>wp_enqueue_scripts</code>', '<code>admin_enqueue_scripts</code>', '<code>login_enqueue_scripts</code>' ), '3.3' );

		if ( !$handles )

			return array(); // No need to instantiate if nothing is there.

		else

			$wp_scripts = new WP_Scripts();

	}

	return $wp_scripts->do_items( $handles );

}

/**

 * Register a new script.

 *

 * Registers a script to be linked later using the wp_enqueue_script() function.

 *

 * @see WP_Dependencies::add(), WP_Dependencies::add_data()

 * @global WP_Scripts $wp_scripts The WP_Scripts object for printing scripts.

 *

 * @since 2.6.0

 *

 * @param string      $handle    Name of the script. Should be unique.

 * @param string      $src       Path to the script from the WordPress root directory. Example: '/js/myscript.js'.

 * @param array       $deps      Optional. An array of registered script handles this script depends on. Set to false if there

 *                               are no dependencies. Default empty array.

 * @param string|bool $ver       Optional. String specifying script version number, if it has one, which is concatenated

 *                               to end of path as a query string. If no version is specified or set to false, a version

 *                               number is automatically added equal to current installed WordPress version.

 *                               If set to null, no version is added. Default 'false'. Accepts 'false', 'null', or 'string'.

 * @param bool        $in_footer Optional. Whether to enqueue the script before </head> or before </body>.

 *                               Default 'false'. Accepts 'false' or 'true'.

 */

function wp_register_script( $handle, $src, $deps = array(), $ver = false, $in_footer = false ) {

	global $wp_scripts;

	if ( ! is_a( $wp_scripts, 'WP_Scripts' ) ) {

		if ( ! did_action( 'init' ) )

			_doing_it_wrong( __FUNCTION__, sprintf( __( 'Scripts and styles should not be registered or enqueued until the %1$s, %2$s, or %3$s hooks.' ),

				'<code>wp_enqueue_scripts</code>', '<code>admin_enqueue_scripts</code>', '<code>login_enqueue_scripts</code>' ), '3.3' );

		$wp_scripts = new WP_Scripts();

	}

	$wp_scripts->add( $handle, $src, $deps, $ver );

	if ( $in_footer )

		$wp_scripts->add_data( $handle, 'group', 1 );

}

/**

 * Localize a script.

 *

 * Works only if the script has already been added.

 *

 * Accepts an associative array $l10n and creates a JavaScript object:

 * <code>

 * "$object_name" = {

 *       key: value,

 *       key: value,

 *       ...

 * }

 * </code>

 *

 * @see WP_Dependencies::localize()

 * @link http://core.trac.wordpress.org/ticket/11520

 * @global WP_Scripts $wp_scripts The WP_Scripts object for printing scripts.

 *

 * @since 2.6.0

 *

 * @param string $handle      Script handle the data will be attached to.

 * @param string $object_name Name for the JavaScript object. Passed directly, so it should be qualified JS variable.

 *                            Example: '/[a-zA-Z0-9_]+/'.

 * @param array $l10n         The data itself. The data can be either a single or multi-dimensional array.

 * @return bool True if the script was successfully localized, false otherwise.

 */

function wp_localize_script( $handle, $object_name, $l10n ) {

	global $wp_scripts;

	if ( ! is_a( $wp_scripts, 'WP_Scripts' ) ) {

		if ( ! did_action( 'init' ) )

			_doing_it_wrong( __FUNCTION__, sprintf( __( 'Scripts and styles should not be registered or enqueued until the %1$s, %2$s, or %3$s hooks.' ),

				'<code>wp_enqueue_scripts</code>', '<code>admin_enqueue_scripts</code>', '<code>login_enqueue_scripts</code>' ), '3.3' );

		return false;

	}

	return $wp_scripts->localize( $handle, $object_name, $l10n );

}

/**

 * Remove a registered script.

 *

 * Note: there are intentional safeguards in place to prevent critical admin scripts,

 * such as jQuery core, from being unregistered.

 *

 * @see WP_Dependencies::remove()

 * @global WP_Scripts $wp_scripts The WP_Scripts object for printing scripts.

 *

 * @since 2.6.0

 *

 * @param string $handle Name of the script to be removed.

 */

function wp_deregister_script( $handle ) {

	global $wp_scripts;

	if ( ! is_a( $wp_scripts, 'WP_Scripts' ) ) {

		if ( ! did_action( 'init' ) )

			_doing_it_wrong( __FUNCTION__, sprintf( __( 'Scripts and styles should not be registered or enqueued until the %1$s, %2$s, or %3$s hooks.' ),

				'<code>wp_enqueue_scripts</code>', '<code>admin_enqueue_scripts</code>', '<code>login_enqueue_scripts</code>' ), '3.3' );

		$wp_scripts = new WP_Scripts();

	}

	/**

	 * Do not allow accidental or negligent de-registering of critical scripts in the admin.

	 * Show minimal remorse if the correct hook is used.

	 */

	$current_filter = current_filter();

	if ( ( is_admin() && 'admin_enqueue_scripts' !== $current_filter ) ||

		( 'wp-login.php' === $GLOBALS['pagenow'] && 'login_enqueue_scripts' !== $current_filter )

	) {

		$no = array(

			'jquery', 'jquery-core', 'jquery-migrate', 'jquery-ui-core', 'jquery-ui-accordion',

			'jquery-ui-autocomplete', 'jquery-ui-button', 'jquery-ui-datepicker', 'jquery-ui-dialog',

			'jquery-ui-draggable', 'jquery-ui-droppable', 'jquery-ui-menu', 'jquery-ui-mouse',

			'jquery-ui-position', 'jquery-ui-progressbar', 'jquery-ui-resizable', 'jquery-ui-selectable',

			'jquery-ui-slider', 'jquery-ui-sortable', 'jquery-ui-spinner', 'jquery-ui-tabs',

			'jquery-ui-tooltip', 'jquery-ui-widget', 'underscore', 'backbone',

		);

		if ( in_array( $handle, $no ) ) {

			$message = sprintf( __( 'Do not deregister the %1$s script in the administration area. To target the frontend theme, use the %2$s hook.' ),

				"<code>$handle</code>", '<code>wp_enqueue_scripts</code>' );

			_doing_it_wrong( __FUNCTION__, $message, '3.6' );

			return;

		}

	}

	$wp_scripts->remove( $handle );

}

/**

 * Enqueue a script.

 *

 * Registers the script if $src provided (does NOT overwrite), and enqueues it.

 *

 * @see WP_Dependencies::add(), WP_Dependencies::add_data(), WP_Dependencies::enqueue()

 * @global WP_Scripts $wp_scripts The WP_Scripts object for printing scripts.

 *

 * @since 2.6.0

 * @param string      $handle    Name of the script.

 * @param string|bool $src       Path to the script from the root directory of WordPress. Example: '/js/myscript.js'.

 * @param array       $deps      An array of registered handles this script depends on. Default empty array.

 * @param string|bool $ver       Optional. String specifying the script version number, if it has one. This parameter

 *                               is used to ensure that the correct version is sent to the client regardless of caching,

 *                               and so should be included if a version number is available and makes sense for the script.

 * @param bool        $in_footer Optional. Whether to enqueue the script before </head> or before </body>.

 *                               Default 'false'. Accepts 'false' or 'true'.

 */

function wp_enqueue_script( $handle, $src = false, $deps = array(), $ver = false, $in_footer = false ) {

	global $wp_scripts;

	if ( ! is_a( $wp_scripts, 'WP_Scripts' ) ) {

		if ( ! did_action( 'init' ) )

			_doing_it_wrong( __FUNCTION__, sprintf( __( 'Scripts and styles should not be registered or enqueued until the %1$s, %2$s, or %3$s hooks.' ),

				'<code>wp_enqueue_scripts</code>', '<code>admin_enqueue_scripts</code>', '<code>login_enqueue_scripts</code>' ), '3.3' );

		$wp_scripts = new WP_Scripts();

	}

	if ( $src ) {

		$_handle = explode('?', $handle);

		$wp_scripts->add( $_handle[0], $src, $deps, $ver );

		if ( $in_footer )

			$wp_scripts->add_data( $_handle[0], 'group', 1 );

	}

	$wp_scripts->enqueue( $handle );

}

/**

 * Remove a previously enqueued script.

 *

 * @see WP_Dependencies::dequeue()

 * @global WP_Scripts $wp_scripts The WP_Scripts object for printing scripts.

 *

 * @since 3.1.0

 *

 * @param string $handle Name of the script to be removed.

 */

function wp_dequeue_script( $handle ) {

	global $wp_scripts;

	if ( ! is_a( $wp_scripts, 'WP_Scripts' ) ) {

		if ( ! did_action( 'init' ) )

			_doing_it_wrong( __FUNCTION__, sprintf( __( 'Scripts and styles should not be registered or enqueued until the %1$s, %2$s, or %3$s hooks.' ),

				'<code>wp_enqueue_scripts</code>', '<code>admin_enqueue_scripts</code>', '<code>login_enqueue_scripts</code>' ), '3.3' );

		$wp_scripts = new WP_Scripts();

	}

	$wp_scripts->dequeue( $handle );

}

/**

 * Check whether a script has been added to the queue.

 *

 * @global WP_Scripts $wp_scripts The WP_Scripts object for printing scripts.

 *

 * @since 2.8.0

 * @since 3.5.0 'enqueued' added as an alias of the 'queue' list.

 *

 * @param string $handle Name of the script.

 * @param string $list   Optional. Status of the script to check. Default 'enqueued'.

 *                       Accepts 'enqueued', 'registered', 'queue', 'to_do', and 'done'.

 * @return bool Whether the script script is queued.

 */

function wp_script_is( $handle, $list = 'enqueued' ) {

	global $wp_scripts;

	if ( ! is_a( $wp_scripts, 'WP_Scripts' ) ) {

		if ( ! did_action( 'init' ) )

			_doing_it_wrong( __FUNCTION__, sprintf( __( 'Scripts and styles should not be registered or enqueued until the %1$s, %2$s, or %3$s hooks.' ),

				'<code>wp_enqueue_scripts</code>', '<code>admin_enqueue_scripts</code>', '<code>login_enqueue_scripts</code>' ), '3.3' );

		$wp_scripts = new WP_Scripts();

	}

	return (bool) $wp_scripts->query( $handle, $list );

}