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<?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;
/**
* 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, $this->done, true) && isset($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 $key
* @param mixed $value
* @return bool success
*/
function add_data( $handle, $key, $value ) {
if ( !isset( $this->registered[$handle] ) )
return false;
return $this->registered[$handle]->add_data( $key, $value );
}
/**
* Get extra data
*
* Gets data associated with a certain handle.
*
* @since WP 3.3
*
* @param string $handle Script name
* @param string $key
* @return mixed
*/
function get_data( $handle, $key ) {
if ( !isset( $this->registered[$handle] ) )
return false;
if ( !isset( $this->registered[$handle]->extra[$key] ) )
return false;
return $this->registered[$handle]->extra[$key];
}
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 ) {
$handle = explode('?', $handle);
$key = array_search($handle[0], $this->queue);
if ( false !== $key ) {
unset($this->queue[$key]);
unset($this->args[$handle[0]]);
}
}
}
function query( $handle, $list = 'registered' ) {
switch ( $list ) {
case 'registered' :
case 'scripts': // back compat
if ( isset( $this->registered[ $handle ] ) )
return $this->registered[ $handle ];
return false;
case 'enqueued' :
case 'queue' :
return in_array( $handle, $this->queue );
case 'to_do' :
case 'to_print': // back compat
return in_array( $handle, $this->to_do );
case 'done' :
case 'printed': // back compat
return in_array( $handle, $this->done );
}
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 __construct() {
@list( $this->handle, $this->src, $this->deps, $this->ver, $this->args ) = func_get_args();
if ( ! is_array($this->deps) )
$this->deps = array();
}
function add_data( $name, $data ) {
if ( !is_scalar($name) )
return false;
$this->extra[$name] = $data;
return true;
}
}
