<?php

/**

 * BackPress Scripts enqueue.

 *

 * These classes were refactored from the WordPress WP_Scripts and WordPress

 * script enqueue API.

 *

 * @package BackPress

 * @since r74

 */

/**

 * BackPress enqueued dependiences class.

 *

 * @package BackPress

 * @uses _WP_Dependency

 * @since r74

 */

class WP_Dependencies {

	var $registered = array();

	var $queue = array();

	var $to_do = array();

	var $done = array();

	var $args = array();

	var $groups = array();

	var $group = 0;

	function WP_Dependencies() {

		$args = func_get_args();

		call_user_func_array( array(&$this, '__construct'), $args );

	}

	function __construct() {}

	/**

	 * Do the dependencies

	 *

	 * Process the items passed to it or the queue.  Processes all dependencies.

	 *

	 * @param mixed handles (optional) items to be processed.  (void) processes queue, (string) process that item, (array of strings) process those items

	 * @return array Items that have been processed

	 */

	function do_items( $handles = false, $group = false ) {

		// Print the queue if nothing is passed.  If a string is passed, print that script.  If an array is passed, print those scripts.

		$handles = false === $handles ? $this->queue : (array) $handles;

		$this->all_deps( $handles );

		foreach( $this->to_do as $key => $handle ) {

			if ( !in_array($handle, $this->done) && isset($this->registered[$handle]) ) {

				if ( ! $this->registered[$handle]->src ) { // Defines a group.

					$this->done[] = $handle;

					continue;

				}

				if ( $this->do_item( $handle, $group ) )

					$this->done[] = $handle;

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

			}

		}

		return $this->done;

	}

	function do_item( $handle ) {

		return isset($this->registered[$handle]);

	}

	/**

	 * Determines dependencies

	 *

	 * Recursively builds array of items to process taking dependencies into account.  Does NOT catch infinite loops.

	 *

	 * @param mixed handles Accepts (string) dep name or (array of strings) dep names

	 * @param bool recursion Used internally when function calls itself

	 */

	function all_deps( $handles, $recursion = false, $group = false ) {

		if ( !$handles = (array) $handles )

			return false;

		foreach ( $handles as $handle ) {

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

			$handle = $handle_parts[0];

			$queued = in_array($handle, $this->to_do, true);

			if ( in_array($handle, $this->done, true) ) // Already done

				continue;

			$moved = $this->set_group( $handle, $recursion, $group );

			if ( $queued && !$moved ) // already queued and in the right group

				continue;

			$keep_going = true;

			if ( !isset($this->registered[$handle]) )

				$keep_going = false; // Script doesn't exist

			elseif ( $this->registered[$handle]->deps && array_diff($this->registered[$handle]->deps, array_keys($this->registered)) )

				$keep_going = false; // Script requires deps which don't exist (not a necessary check.  efficiency?)

			elseif ( $this->registered[$handle]->deps && !$this->all_deps( $this->registered[$handle]->deps, true, $group ) )

				$keep_going = false; // Script requires deps which don't exist

			if ( !$keep_going ) { // Either script or its deps don't exist.

				if ( $recursion )

					return false; // Abort this branch.

				else

					continue; // We're at the top level.  Move on to the next one.

			}

			if ( $queued ) // Already grobbed it and its deps

				continue;

			if ( isset($handle_parts[1]) )

				$this->args[$handle] = $handle_parts[1];

			$this->to_do[] = $handle;

		}

		return true;

	}

	/**

	 * Adds item

	 *

	 * Adds the item only if no item of that name already exists

	 *

	 * @param string handle Script name

	 * @param string src Script url

	 * @param array deps (optional) Array of script names on which this script depends

	 * @param string ver (optional) Script version (used for cache busting)

	 * @return array Hierarchical array of dependencies

	 */

	function add( $handle, $src, $deps = array(), $ver = false, $args = null ) {

		if ( isset($this->registered[$handle]) )

			return false;

		$this->registered[$handle] = new _WP_Dependency( $handle, $src, $deps, $ver, $args );

		return true;

	}

	/**

	 * Adds extra data

	 *

	 * Adds data only if script has already been added

	 *

	 * @param string handle Script name

	 * @param string data_name Name of object in which to store extra data

	 * @param array data Array of extra data

	 * @return bool success

	 */

	function add_data( $handle, $data_name, $data ) {

		if ( !isset($this->registered[$handle]) )

			return false;

		return $this->registered[$handle]->add_data( $data_name, $data );

	}

	function remove( $handles ) {

		foreach ( (array) $handles as $handle )

			unset($this->registered[$handle]);

	}

	function enqueue( $handles ) {

		foreach ( (array) $handles as $handle ) {

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

			if ( !in_array($handle[0], $this->queue) && isset($this->registered[$handle[0]]) ) {

				$this->queue[] = $handle[0];

				if ( isset($handle[1]) )

					$this->args[$handle[0]] = $handle[1];

			}

		}

	}

	function dequeue( $handles ) {

		foreach ( (array) $handles as $handle )

			unset( $this->queue[$handle] );

	}

	function query( $handle, $list = 'registered' ) { // registered, queue, done, to_do

		switch ( $list ) :

		case 'registered':

		case 'scripts': // back compat

			if ( isset($this->registered[$handle]) )

				return $this->registered[$handle];

			break;

		case 'to_print': // back compat

		case 'printed': // back compat

			if ( 'to_print' == $list )

				$list = 'to_do';

			else

				$list = 'printed';

		default:

			if ( in_array($handle, $this->$list) )

				return true;

			break;

		endswitch;

		return false;

	}

	function set_group( $handle, $recursion, $group ) {

		$group = (int) $group;

		if ( $recursion )

			$group = min($this->group, $group);

		else

			$this->group = $group;

		if ( isset($this->groups[$handle]) && $this->groups[$handle] <= $group )

			return false;

		$this->groups[$handle] = $group;

		return true;

	}

}

class _WP_Dependency {

	var $handle;

	var $src;

	var $deps = array();

	var $ver = false;

	var $args = null;

	var $extra = array();

	function _WP_Dependency() {

		@list($this->handle, $this->src, $this->deps, $this->ver, $this->args) = func_get_args();

		if ( !is_array($this->deps) )

			$this->deps = array();

		if ( !$this->ver )

			$this->ver = false;

	}

	function add_data( $name, $data ) {

		if ( !is_scalar($name) )

			return false;

		$this->extra[$name] = $data;

		return true;

	}

}