<?php

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/**

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* Script Modules API: WP_Script_Modules class.

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*

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* Native support for ES Modules and Import Maps.

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*

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* @package WordPress

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* @subpackage Script Modules

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*/

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/**

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* Core class used to register script modules.

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*

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* @since 6.5.0

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*/

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class WP_Script_Modules {

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/**

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* Holds the registered script modules, keyed by script module identifier.

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*

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* @since 6.5.0

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* @var array<string, array<string, mixed>>

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*/

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private $registered = array();

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/**

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* An array of IDs for queued script modules.

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*

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* @since 6.9.0

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* @var string[]

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*/

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private $queue = array();

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/**

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* Holds the script module identifiers that have been printed.

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*

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* @since 6.9.0

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* @var string[]

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*/

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private $done = array();

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/**

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* Tracks whether the @wordpress/a11y script module is available.

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*

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* Some additional HTML is required on the page for the module to work. Track

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* whether it's available to print at the appropriate time.

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*

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* @since 6.7.0

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* @var bool

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*/

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private $a11y_available = false;

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/**

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* Holds a mapping of dependents (as IDs) for a given script ID.

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* Used to optimize recursive dependency tree checks.

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*

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* @since 6.9.0

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* @var array<string, string[]>

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*/

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private $dependents_map = array();

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/**

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* Holds the valid values for fetchpriority.

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*

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* @since 6.9.0

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* @var string[]

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*/

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private $priorities = array(

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'low',

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'auto',

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'high',

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);

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/**

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* Registers the script module if no script module with that script module

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* identifier has already been registered.

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*

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* @since 6.5.0

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* @since 6.9.0 Added the $args parameter.

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*

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* @param string $id The identifier of the script module. Should be unique. It will be used in the

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* final import map.

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* @param string $src Optional. Full URL of the script module, or path of the script module relative

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* to the WordPress root directory. If it is provided and the script module has

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* not been registered yet, it will be registered.

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* @param array $deps {

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* Optional. List of dependencies.

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*

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* @type string|array ...$0 {

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* An array of script module identifiers of the dependencies of this script

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* module. The dependencies can be strings or arrays. If they are arrays,

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* they need an `id` key with the script module identifier, and can contain

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* an `import` key with either `static` or `dynamic`. By default,

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* dependencies that don't contain an `import` key are considered static.

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*

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* @type string $id The script module identifier.

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* @type string $import Optional. Import type. May be either `static` or

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* `dynamic`. Defaults to `static`.

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* }

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* }

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* @param string|false|null $version Optional. String specifying the script module version number. Defaults to false.

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* It is added to the URL as a query string for cache busting purposes. If $version

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* is set to false, the version number is the currently installed WordPress version.

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* If $version is set to null, no version is added.

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* @param array $args {

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* Optional. An array of additional args. Default empty array.

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*

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* @type bool $in_footer Whether to print the script module in the footer. Only relevant to block themes. Default 'false'. Optional.

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* @type 'auto'|'low'|'high' $fetchpriority Fetch priority. Default 'auto'. Optional.

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* }

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*/

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public function register( string $id, string $src, array $deps = array(), $version = false, array $args = array() ) {

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if ( '' === $id ) {

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_doing_it_wrong( __METHOD__, __( 'Non-empty string required for id.' ), '6.9.0' );

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return;

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}

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

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$dependencies = array();

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foreach ( $deps as $dependency ) {

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if ( is_array( $dependency ) ) {

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if ( ! isset( $dependency['id'] ) || ! is_string( $dependency['id'] ) ) {

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_doing_it_wrong( __METHOD__, __( 'Missing required id key in entry among dependencies array.' ), '6.5.0' );

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continue;

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}

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$dependencies[] = array(

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'id' => $dependency['id'],

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'import' => isset( $dependency['import'] ) && 'dynamic' === $dependency['import'] ? 'dynamic' : 'static',

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);

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} elseif ( is_string( $dependency ) ) {

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$dependencies[] = array(

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'id' => $dependency,

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'import' => 'static',

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);

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} else {

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_doing_it_wrong( __METHOD__, __( 'Entries in dependencies array must be either strings or arrays with an id key.' ), '6.5.0' );

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}

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}

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$in_footer = isset( $args['in_footer'] ) && (bool) $args['in_footer'];

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$fetchpriority = 'auto';

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if ( isset( $args['fetchpriority'] ) ) {

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if ( $this->is_valid_fetchpriority( $args['fetchpriority'] ) ) {

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$fetchpriority = $args['fetchpriority'];

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} else {

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_doing_it_wrong(

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__METHOD__,

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sprintf(

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/* translators: 1: $fetchpriority, 2: $id */

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__( 'Invalid fetchpriority `%1$s` defined for `%2$s` during script registration.' ),

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is_string( $args['fetchpriority'] ) ? $args['fetchpriority'] : gettype( $args['fetchpriority'] ),

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$id

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),

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'6.9.0'

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);

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}

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}

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$this->registered[ $id ] = array(

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'src' => $src,

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'version' => $version,

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'dependencies' => $dependencies,

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'in_footer' => $in_footer,

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'fetchpriority' => $fetchpriority,

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);

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}

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}

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/**

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* Gets IDs for queued script modules.

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*

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* @since 6.9.0

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*

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* @return string[] Script module IDs.

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*/

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public function get_queue(): array {

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return $this->queue;

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}

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/**

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* Checks if the provided fetchpriority is valid.

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*

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* @since 6.9.0

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*

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* @param string|mixed $priority Fetch priority.

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* @return bool Whether valid fetchpriority.

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*/

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private function is_valid_fetchpriority( $priority ): bool {

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return in_array( $priority, $this->priorities, true );

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}

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/**

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* Sets the fetch priority for a script module.

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*

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* @since 6.9.0

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*

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* @param string $id Script module identifier.

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* @param 'auto'|'low'|'high' $priority Fetch priority for the script module.

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* @return bool Whether setting the fetchpriority was successful.

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*/

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public function set_fetchpriority( string $id, string $priority ): bool {

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

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return false;

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}

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if ( '' === $priority ) {

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$priority = 'auto';

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}

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if ( ! $this->is_valid_fetchpriority( $priority ) ) {

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_doing_it_wrong(

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__METHOD__,

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/* translators: %s: Invalid fetchpriority. */

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sprintf( __( 'Invalid fetchpriority: %s' ), $priority ),

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'6.9.0'

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);

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return false;

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}

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$this->registered[ $id ]['fetchpriority'] = $priority;

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return true;

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}

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/**

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* Sets whether a script module should be printed in the footer.

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*

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* This is only relevant in block themes.

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*

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* @since 6.9.0

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*

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* @param string $id Script module identifier.

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* @param bool $in_footer Whether to print in the footer.

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* @return bool Whether setting the printing location was successful.

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*/

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public function set_in_footer( string $id, bool $in_footer ): bool {

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

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return false;

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}

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$this->registered[ $id ]['in_footer'] = $in_footer;

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return true;

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}

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/**

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* Marks the script module to be enqueued in the page.

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*

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* If a src is provided and the script module has not been registered yet, it

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* will be registered.

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*

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* @since 6.5.0

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* @since 6.9.0 Added the $args parameter.

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*

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* @param string $id The identifier of the script module. Should be unique. It will be used in the

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* final import map.

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* @param string $src Optional. Full URL of the script module, or path of the script module relative

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* to the WordPress root directory. If it is provided and the script module has

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* not been registered yet, it will be registered.

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* @param array $deps {

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* Optional. List of dependencies.

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*

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* @type string|array ...$0 {

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* An array of script module identifiers of the dependencies of this script

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* module. The dependencies can be strings or arrays. If they are arrays,

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* they need an `id` key with the script module identifier, and can contain

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* an `import` key with either `static` or `dynamic`. By default,

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* dependencies that don't contain an `import` key are considered static.

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*

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* @type string $id The script module identifier.

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* @type string $import Optional. Import type. May be either `static` or

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* `dynamic`. Defaults to `static`.

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* }

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* }

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* @param string|false|null $version Optional. String specifying the script module version number. Defaults to false.

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* It is added to the URL as a query string for cache busting purposes. If $version

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* is set to false, the version number is the currently installed WordPress version.

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* If $version is set to null, no version is added.

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* @param array $args {

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* Optional. An array of additional args. Default empty array.

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*

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* @type bool $in_footer Whether to print the script module in the footer. Only relevant to block themes. Default 'false'. Optional.

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* @type 'auto'|'low'|'high' $fetchpriority Fetch priority. Default 'auto'. Optional.

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* }

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*/

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public function enqueue( string $id, string $src = '', array $deps = array(), $version = false, array $args = array() ) {

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if ( '' === $id ) {

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_doing_it_wrong( __METHOD__, __( 'Non-empty string required for id.' ), '6.9.0' );

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return;

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}

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if ( ! in_array( $id, $this->queue, true ) ) {

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$this->queue[] = $id;

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}

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if ( ! isset( $this->registered[ $id ] ) && $src ) {

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$this->register( $id, $src, $deps, $version, $args );

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}

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}

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/**

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* Unmarks the script module so it will no longer be enqueued in the page.

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*

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* @since 6.5.0

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*

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* @param string $id The identifier of the script module.

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*/

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public function dequeue( string $id ) {

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$this->queue = array_values( array_diff( $this->queue, array( $id ) ) );

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}

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/**

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* Removes a registered script module.

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*

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* @since 6.5.0

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*

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* @param string $id The identifier of the script module.

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*/

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public function deregister( string $id ) {

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$this->dequeue( $id );

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

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}

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/**

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* Adds the hooks to print the import map, enqueued script modules and script

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* module preloads.

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*

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* In classic themes, the script modules used by the blocks are not yet known

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* when the `wp_head` actions is fired, so it needs to print everything in the

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* footer.

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*

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* @since 6.5.0

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*/

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public function add_hooks() {

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$is_block_theme = wp_is_block_theme();

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$position = $is_block_theme ? 'wp_head' : 'wp_footer';

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add_action( $position, array( $this, 'print_import_map' ) );

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if ( $is_block_theme ) {

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/*

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* Modules can only be printed in the head for block themes because only with

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* block themes will import map be fully populated by modules discovered by

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* rendering the block template. In classic themes, modules are enqueued during

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* template rendering, thus the import map must be printed in the footer,

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* followed by all enqueued modules.

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*/

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add_action( 'wp_head', array( $this, 'print_head_enqueued_script_modules' ) );

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}

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add_action( 'wp_footer', array( $this, 'print_enqueued_script_modules' ) );

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add_action( $position, array( $this, 'print_script_module_preloads' ) );

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add_action( 'admin_print_footer_scripts', array( $this, 'print_import_map' ) );

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add_action( 'admin_print_footer_scripts', array( $this, 'print_enqueued_script_modules' ) );

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add_action( 'admin_print_footer_scripts', array( $this, 'print_script_module_preloads' ) );

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add_action( 'wp_footer', array( $this, 'print_script_module_data' ) );

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add_action( 'admin_print_footer_scripts', array( $this, 'print_script_module_data' ) );

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add_action( 'wp_footer', array( $this, 'print_a11y_script_module_html' ), 20 );

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add_action( 'admin_print_footer_scripts', array( $this, 'print_a11y_script_module_html' ), 20 );

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}

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/**

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* Gets the highest fetch priority for the provided script IDs.

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*

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* @since 6.9.0

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*

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* @param string[] $ids Script module IDs.

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* @return 'auto'|'low'|'high' Highest fetch priority for the provided script module IDs.

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*/

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private function get_highest_fetchpriority( array $ids ): string {

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static $high_priority_index = null;

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if ( null === $high_priority_index ) {

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$high_priority_index = count( $this->priorities ) - 1;

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}

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$highest_priority_index = 0;

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foreach ( $ids as $id ) {

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if ( isset( $this->registered[ $id ] ) ) {

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$highest_priority_index = (int) max(

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$highest_priority_index,

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(int) array_search( $this->registered[ $id ]['fetchpriority'], $this->priorities, true )

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);

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if ( $high_priority_index === $highest_priority_index ) {

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break;

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}

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}

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}

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return $this->priorities[ $highest_priority_index ];

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}

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/**

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* Prints the enqueued script modules in head.

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*

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* This is only used in block themes.

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*

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* @since 6.9.0

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*/

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public function print_head_enqueued_script_modules() {

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foreach ( $this->get_sorted_dependencies( $this->queue ) as $id ) {

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if (

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isset( $this->registered[ $id ] ) &&

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! $this->registered[ $id ]['in_footer']

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) {

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// If any dependency is set to be printed in footer, skip printing this module in head.

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$dependencies = array_keys( $this->get_dependencies( array( $id ) ) );

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foreach ( $dependencies as $dependency_id ) {

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if (

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in_array( $dependency_id, $this->queue, true ) &&

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isset( $this->registered[ $dependency_id ] ) &&

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$this->registered[ $dependency_id ]['in_footer']

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) {

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continue 2;

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}

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}

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$this->print_script_module( $id );

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}

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}

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}

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/**

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* Prints the enqueued script modules in footer.

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*

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* @since 6.5.0

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*/

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public function print_enqueued_script_modules() {

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foreach ( $this->get_sorted_dependencies( $this->queue ) as $id ) {

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$this->print_script_module( $id );

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}

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}

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/**

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* Prints the enqueued script module using script tags with type="module"

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* attributes.

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*

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* @since 6.9.0

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*

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* @param string $id The script module identifier.

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*/

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private function print_script_module( string $id ) {

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if ( in_array( $id, $this->done, true ) || ! in_array( $id, $this->queue, true ) ) {

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return;

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}

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$this->done[] = $id;

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$src = $this->get_src( $id );

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if ( '' === $src ) {

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return;

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}

[444] Fix | Delete

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$attributes = array(

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'type' => 'module',

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'src' => $src,

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'id' => $id . '-js-module',

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);

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$script_module = $this->registered[ $id ];

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$dependents = $this->get_recursive_dependents( $id );

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$fetchpriority = $this->get_highest_fetchpriority( array_merge( array( $id ), $dependents ) );

[454] Fix | Delete

if ( 'auto' !== $fetchpriority ) {

[455] Fix | Delete

$attributes['fetchpriority'] = $fetchpriority;

[456] Fix | Delete

}

[457] Fix | Delete

if ( $fetchpriority !== $script_module['fetchpriority'] ) {

[458] Fix | Delete

$attributes['data-wp-fetchpriority'] = $script_module['fetchpriority'];

[459] Fix | Delete

}

[460] Fix | Delete

wp_print_script_tag( $attributes );

[461] Fix | Delete

}

[462] Fix | Delete

[463] Fix | Delete

/**

[464] Fix | Delete

* Prints the static dependencies of the enqueued script modules using

[465] Fix | Delete

* link tags with rel="modulepreload" attributes.

[466] Fix | Delete

*

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* If a script module is marked for enqueue, it will not be preloaded.

[468] Fix | Delete

*

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* @since 6.5.0

[470] Fix | Delete

*/

[471] Fix | Delete

public function print_script_module_preloads() {

[472] Fix | Delete

$dependency_ids = $this->get_sorted_dependencies( $this->queue, array( 'static' ) );

[473] Fix | Delete

foreach ( $dependency_ids as $id ) {

[474] Fix | Delete

// Don't preload if it's marked for enqueue.

[475] Fix | Delete

if ( in_array( $id, $this->queue, true ) ) {

[476] Fix | Delete

continue;

[477] Fix | Delete

}

[478] Fix | Delete

[479] Fix | Delete

$src = $this->get_src( $id );

[480] Fix | Delete

if ( '' === $src ) {

[481] Fix | Delete

continue;

[482] Fix | Delete

}

[483] Fix | Delete

[484] Fix | Delete

$enqueued_dependents = array_intersect( $this->get_recursive_dependents( $id ), $this->queue );

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$highest_fetchpriority = $this->get_highest_fetchpriority( $enqueued_dependents );

[486] Fix | Delete

printf(

[487] Fix | Delete

'<link rel="modulepreload" href="%s" id="%s"',

[488] Fix | Delete

esc_url( $src ),

[489] Fix | Delete

esc_attr( $id . '-js-modulepreload' )

[490] Fix | Delete

);

[491] Fix | Delete

if ( 'auto' !== $highest_fetchpriority ) {

[492] Fix | Delete

printf( ' fetchpriority="%s"', esc_attr( $highest_fetchpriority ) );

[493] Fix | Delete

}

[494] Fix | Delete

if ( $highest_fetchpriority !== $this->registered[ $id ]['fetchpriority'] && 'auto' !== $this->registered[ $id ]['fetchpriority'] ) {

[495] Fix | Delete

printf( ' data-wp-fetchpriority="%s"', esc_attr( $this->registered[ $id ]['fetchpriority'] ) );

[496] Fix | Delete

}

[497] Fix | Delete

echo ">\n";

[498] Fix | Delete

}

[499] Fix | Delete