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<?php
/**
* Dependencies API: WP_Dependencies base class
*
* @since 2.6.0
*
* @package WordPress
* @subpackage Dependencies
*/
/**
* Core base class extended to register items.
*
* @since 2.6.0
*
* @see _WP_Dependency
*/
class WP_Dependencies {
/**
* An array of registered handle objects.
*
* @since 2.6.8
* @var array
*/
public $registered = array();
/**
* An array of queued _WP_Dependency handle objects.
*
* @since 2.6.8
* @var array
*/
public $queue = array();
/**
* An array of _WP_Dependency handle objects to queue.
*
* @since 2.6.0
* @var array
*/
public $to_do = array();
/**
* An array of _WP_Dependency handle objects already queued.
*
* @since 2.6.0
* @var array
*/
public $done = array();
/**
* An array of additional arguments passed when a handle is registered.
*
* Arguments are appended to the item query string.
*
* @since 2.6.0
* @var array
*/
public $args = array();
/**
* An array of handle groups to enqueue.
*
* @since 2.8.0
* @var array
*/
public $groups = array();
/**
* A handle group to enqueue.
*
* @since 2.8.0
* @deprecated 4.5.0
* @var int
*/
public $group = 0;
/**
* Processes the items and dependencies.
*
* Processes the items passed to it or the queue, and their dependencies.
*
* @since 2.6.0
* @since 2.8.0 Added the `$group` parameter.
*
* @param mixed $handles Optional. Items to be processed: Process queue (false), process item (string), process items (array of strings).
* @param mixed $group Group level: level (int), no groups (false).
* @return array Handles of items that have been processed.
*/
public function do_items( $handles = false, $group = false ) {
/*
* If nothing is passed, print the queue. If a string is passed,
* print that item. If an array is passed, print those items.
*/
$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]) ) {
/*
* Attempt to process the item. If successful,
* add the handle to the done array.
*
* Unset the item from the to_do array.
*/
if ( $this->do_item( $handle, $group ) )
$this->done[] = $handle;
unset( $this->to_do[$key] );
}
}
return $this->done;
}
/**
* Processes a dependency.
*
* @since 2.6.0
*
* @param string $handle Name of the item. Should be unique.
* @return bool True on success, false if not set.
*/
public function do_item( $handle ) {
return isset($this->registered[$handle]);
}
/**
* Determines dependencies.
*
* Recursively builds an array of items to process taking
* dependencies into account. Does NOT catch infinite loops.
*
* @since 2.1.0
* @since 2.6.0 Moved from `WP_Scripts`.
* @since 2.8.0 Added the `$group` parameter.
*
* @param mixed $handles Item handle and argument (string) or item handles and arguments (array of strings).
* @param bool $recursion Internal flag that function is calling itself.
* @param int|false $group Group level: (int) level, (false) no groups.
* @return bool True on success, false on failure.
*/
public 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 );
$new_group = $this->groups[ $handle ];
if ( $queued && !$moved ) // already queued and in the right group
continue;
$keep_going = true;
if ( !isset($this->registered[$handle]) )
$keep_going = false; // Item doesn't exist.
elseif ( $this->registered[$handle]->deps && array_diff($this->registered[$handle]->deps, array_keys($this->registered)) )
$keep_going = false; // Item requires dependencies that don't exist.
elseif ( $this->registered[$handle]->deps && !$this->all_deps( $this->registered[$handle]->deps, true, $new_group ) )
$keep_going = false; // Item requires dependencies that don't exist.
if ( ! $keep_going ) { // Either item or its dependencies 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 ( $queued ) // Already grabbed it and its dependencies.
continue;
if ( isset($handle_parts[1]) )
$this->args[$handle] = $handle_parts[1];
$this->to_do[] = $handle;
}
return true;
}
/**
* Register an item.
*
* Registers the item if no item of that name already exists.
*
* @since 2.1.0
* @since 2.6.0 Moved from `WP_Scripts`.
*
* @param string $handle Name of the item. Should be unique.
* @param string $src Full URL of the item, or path of the item relative to the WordPress root directory.
* @param array $deps Optional. An array of registered item handles this item depends on. Default empty array.
* @param string|bool|null $ver Optional. String specifying item version number, if it has one, which is added to the URL
* as a query string for cache busting purposes. If version is set to false, a version
* number is automatically added equal to current installed WordPress version.
* If set to null, no version is added.
* @param mixed $args Optional. Custom property of the item. NOT the class property $args. Examples: $media, $in_footer.
* @return bool Whether the item has been registered. True on success, false on failure.
*/
public 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;
}
/**
* Add extra item data.
*
* Adds data to a registered item.
*
* @since 2.6.0
*
* @param string $handle Name of the item. Should be unique.
* @param string $key The data key.
* @param mixed $value The data value.
* @return bool True on success, false on failure.
*/
public function add_data( $handle, $key, $value ) {
if ( !isset( $this->registered[$handle] ) )
return false;
return $this->registered[$handle]->add_data( $key, $value );
}
/**
* Get extra item data.
*
* Gets data associated with a registered item.
*
* @since 3.3.0
*
* @param string $handle Name of the item. Should be unique.
* @param string $key The data key.
* @return mixed Extra item data (string), false otherwise.
*/
public 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];
}
/**
* Un-register an item or items.
*
* @since 2.1.0
* @since 2.6.0 Moved from `WP_Scripts`.
*
* @param mixed $handles Item handle and argument (string) or item handles and arguments (array of strings).
* @return void
*/
public function remove( $handles ) {
foreach ( (array) $handles as $handle )
unset($this->registered[$handle]);
}
/**
* Queue an item or items.
*
* Decodes handles and arguments, then queues handles and stores
* arguments in the class property $args. For example in extending
* classes, $args is appended to the item url as a query string.
* Note $args is NOT the $args property of items in the $registered array.
*
* @since 2.1.0
* @since 2.6.0 Moved from `WP_Scripts`.
*
* @param mixed $handles Item handle and argument (string) or item handles and arguments (array of strings).
*/
public 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];
}
}
}
/**
* Dequeue an item or items.
*
* Decodes handles and arguments, then dequeues handles
* and removes arguments from the class property $args.
*
* @since 2.1.0
* @since 2.6.0 Moved from `WP_Scripts`.
*
* @param mixed $handles Item handle and argument (string) or item handles and arguments (array of strings).
*/
public 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]]);
}
}
}
/**
* Recursively search the passed dependency tree for $handle
*
* @since 4.0.0
*
* @param array $queue An array of queued _WP_Dependency handle objects.
* @param string $handle Name of the item. Should be unique.
* @return bool Whether the handle is found after recursively searching the dependency tree.
*/
protected function recurse_deps( $queue, $handle ) {
foreach ( $queue as $queued ) {
if ( ! isset( $this->registered[ $queued ] ) ) {
continue;
}
if ( in_array( $handle, $this->registered[ $queued ]->deps ) ) {
return true;
} elseif ( $this->recurse_deps( $this->registered[ $queued ]->deps, $handle ) ) {
return true;
}
}
return false;
}
/**
* Query list for an item.
*
* @since 2.1.0
* @since 2.6.0 Moved from `WP_Scripts`.
*
* @param string $handle Name of the item. Should be unique.
* @param string $list Property name of list array.
* @return bool|_WP_Dependency Found, or object Item data.
*/
public 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' :
if ( in_array( $handle, $this->queue ) ) {
return true;
}
return $this->recurse_deps( $this->queue, $handle );
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;
}
/**
* Set item group, unless already in a lower group.
*
* @since 2.8.0
*
* @param string $handle Name of the item. Should be unique.
* @param bool $recursion Internal flag that calling function was called recursively.
* @param mixed $group Group level.
* @return bool Not already in the group or a lower group
*/
public function set_group( $handle, $recursion, $group ) {
$group = (int) $group;
if ( isset( $this->groups[ $handle ] ) && $this->groups[ $handle ] <= $group ) {
return false;
}
$this->groups[ $handle ] = $group;
return true;
}
}