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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
*/
#[AllowDynamicProperties]
class WP_Dependencies {
/**
* An array of all registered dependencies keyed by handle.
*
* @since 2.6.8
*
* @var _WP_Dependency[]
*/
public $registered = array();
/**
* An array of handles of queued dependencies.
*
* @since 2.6.8
*
* @var string[]
*/
public $queue = array();
/**
* An array of handles of dependencies to queue.
*
* @since 2.6.0
*
* @var string[]
*/
public $to_do = array();
/**
* An array of handles of dependencies already queued.
*
* @since 2.6.0
*
* @var string[]
*/
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 dependency groups to enqueue.
*
* Each entry is keyed by handle and represents the integer group level or boolean
* false if the handle has no group.
*
* @since 2.8.0
*
* @var (int|false)[]
*/
public $groups = array();
/**
* A handle group to enqueue.
*
* @since 2.8.0
*
* @deprecated 4.5.0
* @var int
*/
public $group = 0;
/**
* Cached lookup array of flattened queued items and dependencies.
*
* @since 5.4.0
*
* @var array
*/
private $all_queued_deps;
/**
* List of assets enqueued before details were registered.
*
* @since 5.9.0
*
* @var array
*/
private $queued_before_register = array();
/**
* List of handles for dependencies encountered which themselves have missing dependencies.
*
* A dependency handle is added to this list when it is discovered to have missing dependencies. At this time, a
* warning is emitted with {@see _doing_it_wrong()}. The handle is then added to this list, so that duplicate
* warnings don't occur.
*
* @since 6.9.1
* @var string[]
*/
private $dependencies_with_missing_dependencies = array();
/**
* Processes the items and dependencies.
*
* Processes the items passed to it or the queue, and their dependencies.
*
* @since 2.6.0
* @since 2.8.0 Added the `$group` parameter.
*
* @param string|string[]|false $handles Optional. Items to be processed: queue (false),
* single item (string), or multiple items (array of strings).
* Default false.
* @param int|false $group Optional. Group level: level (int), no group (false).
* @return string[] Array of 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 $this->done;
}
/**
* Processes a dependency.
*
* @since 2.6.0
* @since 5.5.0 Added the `$group` parameter.
*
* @param string $handle Name of the item. Should be unique.
* @param int|false $group Optional. Group level: level (int), no group (false).
* Default false.
* @return bool True on success, false if not set.
*/
public function do_item( $handle, $group = false ) {
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 string|string[] $handles Item handle (string) or item handles (array of strings).
* @param bool $recursion Optional. Internal flag that function is calling itself.
* Default false.
* @param int|false $group Optional. Group level: level (int), no group (false).
* Default false.
* @return bool True on success, false on failure.
*/
public function all_deps( $handles, $recursion = false, $group = false ) {
$handles = (array) $handles;
if ( ! $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;
$missing_dependencies = array();
if ( isset( $this->registered[ $handle ] ) && count( $this->registered[ $handle ]->deps ) > 0 ) {
$missing_dependencies = array_diff( $this->registered[ $handle ]->deps, array_keys( $this->registered ) );
}
if ( ! isset( $this->registered[ $handle ] ) ) {
$keep_going = false; // Item doesn't exist.
} elseif ( count( $missing_dependencies ) > 0 ) {
if ( ! in_array( $handle, $this->dependencies_with_missing_dependencies, true ) ) {
_doing_it_wrong(
get_class( $this ) . '::add',
$this->get_dependency_warning_message( $handle, $missing_dependencies ),
'6.9.1'
);
$this->dependencies_with_missing_dependencies[] = $handle;
}
$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|false $src Full URL of the item, or path of the item relative
* to the WordPress root directory. If source is set to false,
* the item is an alias of other items it depends on.
* @param string[] $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 );
// If the item was enqueued before the details were registered, enqueue it now.
if ( array_key_exists( $handle, $this->queued_before_register ) ) {
if ( ! is_null( $this->queued_before_register[ $handle ] ) ) {
$this->enqueue( $handle . '?' . $this->queued_before_register[ $handle ] );
} else {
$this->enqueue( $handle );
}
unset( $this->queued_before_register[ $handle ] );
}
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;
}
if ( 'conditional' === $key && '_required-conditional-dependency_' !== $value ) {
_deprecated_argument(
'WP_Dependencies->add_data()',
'6.9.0',
__( 'IE conditional comments are ignored by all supported browsers.' )
);
}
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 string|string[] $handles Item handle (string) or item handles (array of strings).
*/
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 string|string[] $handles Item handle (string) or item handles (array of strings).
*/
public function enqueue( $handles ) {
foreach ( (array) $handles as $handle ) {
$handle = explode( '?', $handle );
if ( ! in_array( $handle[0], $this->queue, true ) && isset( $this->registered[ $handle[0] ] ) ) {
$this->queue[] = $handle[0];
// Reset all dependencies so they must be recalculated in recurse_deps().
$this->all_queued_deps = null;
if ( isset( $handle[1] ) ) {
$this->args[ $handle[0] ] = $handle[1];
}
} elseif ( ! isset( $this->registered[ $handle[0] ] ) ) {
$this->queued_before_register[ $handle[0] ] = null; // $args
if ( isset( $handle[1] ) ) {
$this->queued_before_register[ $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 string|string[] $handles Item handle (string) or item handles (array of strings).
*/
public function dequeue( $handles ) {
foreach ( (array) $handles as $handle ) {
$handle = explode( '?', $handle );
$key = array_search( $handle[0], $this->queue, true );
if ( false !== $key ) {
// Reset all dependencies so they must be recalculated in recurse_deps().
$this->all_queued_deps = null;
unset( $this->queue[ $key ] );
unset( $this->args[ $handle[0] ] );
} elseif ( array_key_exists( $handle[0], $this->queued_before_register ) ) {
unset( $this->queued_before_register[ $handle[0] ] );
}
}
}
/**
* Recursively search the passed dependency tree for a handle.
*
* @since 4.0.0
*
* @param string[] $queue An array of queued _WP_Dependency handles.
* @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 ) {
if ( isset( $this->all_queued_deps ) ) {
return isset( $this->all_queued_deps[ $handle ] );
}
$all_deps = array_fill_keys( $queue, true );
$queues = array();
$done = array();
while ( $queue ) {
foreach ( $queue as $queued ) {
if ( ! isset( $done[ $queued ] ) && isset( $this->registered[ $queued ] ) ) {
$deps = $this->registered[ $queued ]->deps;
if ( $deps ) {
$all_deps += array_fill_keys( $deps, true );
array_push( $queues, $deps );
}
$done[ $queued ] = true;
}
}
$queue = array_pop( $queues );
}
$this->all_queued_deps = $all_deps;
return isset( $this->all_queued_deps[ $handle ] );
}
/**
* Query the 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 $status Optional. Status of the item to query. Default 'registered'.
* @return bool|_WP_Dependency Found, or object Item data.
*/
public function query( $handle, $status = 'registered' ) {
switch ( $status ) {
case 'registered':
case 'scripts': // Back compat.
if ( isset( $this->registered[ $handle ] ) ) {
return $this->registered[ $handle ];
}
return false;
case 'enqueued':
case 'queue': // Back compat.
if ( in_array( $handle, $this->queue, true ) ) {
return true;
}
return $this->recurse_deps( $this->queue, $handle );
case 'to_do':
case 'to_print': // Back compat.
return in_array( $handle, $this->to_do, true );
case 'done':
case 'printed': // Back compat.
return in_array( $handle, $this->done, true );
}
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 int|false $group Group level: level (int), no group (false).
* @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;
}
/**
* Get etag header for cache validation.
*
* @since 6.7.0
*
* @global string $wp_version The WordPress version string.
*
* @param string[] $load Array of script or style handles to load.
* @return string Etag header.
*/
public function get_etag( $load ) {
/*
* Note: wp_get_wp_version() is not used here, as this file can be included
* via wp-admin/load-scripts.php or wp-admin/load-styles.php, in which case
* wp-includes/functions.php is not loaded.
*/
global $wp_version;
$etag = "WP:{$wp_version};";
foreach ( $load as $handle ) {
if ( ! array_key_exists( $handle, $this->registered ) ) {
continue;
}
$ver = $this->registered[ $handle ]->ver ?? $wp_version;
$etag .= "{$handle}:{$ver};";
}
/*
* This is not intended to be cryptographically secure, just a fast way to get
* a fixed length string based on the script versions. As this file does not
* load the full WordPress environment, it is not possible to use the salted
* wp_hash() function.
*/
return 'W/"' . md5( $etag ) . '"';
}
/**
* Gets a dependency warning message for a handle.
*
* @since 6.9.1
*
* @param string $handle Handle with missing dependencies.
* @param string[] $missing_dependency_handles Missing dependency handles.
* @return string Formatted, localized warning message.
*/
protected function get_dependency_warning_message( $handle, $missing_dependency_handles ) {
return sprintf(
/* translators: 1: Handle, 2: List of missing dependency handles. */
__( 'The handle "%1$s" was enqueued with dependencies that are not registered: %2$s.' ),
$handle,
implode( wp_get_list_item_separator(), $missing_dependency_handles )
);
}
}