<?php

/**

 * BackPress script procedural API.

 *

 * @package BackPress

 * @since r16

 */

/**

 * Prints script tags in document head.

 *

 * Called by admin-header.php and by 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. Does make use of already

 * instantiated $wp_scripts if present. Use provided wp_print_scripts hook to

 * register/enqueue new scripts.

 *

 * @since r16

 * @see WP_Dependencies::print_scripts()

 */

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 ( !$handles )

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

		else

			$wp_scripts = new WP_Scripts();

	}

	return $wp_scripts->do_items( $handles );

}

/**

 * Register new JavaScript file.

 *

 * @since r16

 * @see WP_Dependencies::add() For parameter information.

 */

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

	global $wp_scripts;

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

		$wp_scripts = new WP_Scripts();

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

	if ( $in_footer )

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

}

/**

 * Localizes a script.

 *

 * Localizes only if script has already been added.

 *

 * @since r16

 * @see WP_Script::localize()

 */

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

	global $wp_scripts;

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

		return false;

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

}

/**

 * Remove a registered script.

 *

 * @since r16

 * @see WP_Scripts::remove() For parameter information.

 */

function wp_deregister_script( $handle ) {

	global $wp_scripts;

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

		$wp_scripts = new WP_Scripts();

	$wp_scripts->remove( $handle );

}

/**

 * Enqueues script.

 *

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

 *

 * @since r16

 * @see WP_Script::add(), WP_Script::enqueue()

*/

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

	global $wp_scripts;

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

		$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 );

}

/**

 * Check whether script has been added to WordPress Scripts.

 *

 * The values for list defaults to 'queue', which is the same as enqueue for

 * scripts.

 *

 * @since WP unknown; BP unknown

 *

 * @param string $handle Handle used to add script.

 * @param string $list Optional, defaults to 'queue'. Others values are 'registered', 'queue', 'done', 'to_do'

 * @return bool

 */

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

	global $wp_scripts;

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

		$wp_scripts = new WP_Scripts();

	$query = $wp_scripts->query( $handle, $list );

	if ( is_object( $query ) )

		return true;

	return $query;

}