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<?php
/**
* Script Modules API: WP_Script_Modules class.
*
* Native support for ES Modules and Import Maps.
*
* @package WordPress
* @subpackage Script Modules
*/
/**
* Core class used to register script modules.
*
* @since 6.5.0
*/
class WP_Script_Modules {
/**
* Holds the registered script modules, keyed by script module identifier.
*
* @since 6.5.0
* @var array[]
*/
private $registered = array();
/**
* Holds the script module identifiers that were enqueued before registered.
*
* @since 6.5.0
* @var array<string, true>
*/
private $enqueued_before_registered = array();
/**
* Tracks whether the @wordpress/a11y script module is available.
*
* Some additional HTML is required on the page for the module to work. Track
* whether it's available to print at the appropriate time.
*
* @since 6.7.0
* @var bool
*/
private $a11y_available = false;
/**
* Registers the script module if no script module with that script module
* identifier has already been registered.
*
* @since 6.5.0
*
* @param string $id The identifier of the script module. Should be unique. It will be used in the
* final import map.
* @param string $src Optional. Full URL of the script module, or path of the script module relative
* to the WordPress root directory. If it is provided and the script module has
* not been registered yet, it will be registered.
* @param array $deps {
* Optional. List of dependencies.
*
* @type string|array ...$0 {
* An array of script module identifiers of the dependencies of this script
* module. The dependencies can be strings or arrays. If they are arrays,
* they need an `id` key with the script module identifier, and can contain
* an `import` key with either `static` or `dynamic`. By default,
* dependencies that don't contain an `import` key are considered static.
*
* @type string $id The script module identifier.
* @type string $import Optional. Import type. May be either `static` or
* `dynamic`. Defaults to `static`.
* }
* }
* @param string|false|null $version Optional. String specifying the script module version number. Defaults to false.
* It is added to the URL as a query string for cache busting purposes. If $version
* is set to false, the version number is the currently installed WordPress version.
* If $version is set to null, no version is added.
*/
public function register( string $id, string $src, array $deps = array(), $version = false ) {
if ( ! isset( $this->registered[ $id ] ) ) {
$dependencies = array();
foreach ( $deps as $dependency ) {
if ( is_array( $dependency ) ) {
if ( ! isset( $dependency['id'] ) ) {
_doing_it_wrong( __METHOD__, __( 'Missing required id key in entry among dependencies array.' ), '6.5.0' );
continue;
}
$dependencies[] = array(
'id' => $dependency['id'],
'import' => isset( $dependency['import'] ) && 'dynamic' === $dependency['import'] ? 'dynamic' : 'static',
);
} elseif ( is_string( $dependency ) ) {
$dependencies[] = array(
'id' => $dependency,
'import' => 'static',
);
} else {
_doing_it_wrong( __METHOD__, __( 'Entries in dependencies array must be either strings or arrays with an id key.' ), '6.5.0' );
}
}
$this->registered[ $id ] = array(
'src' => $src,
'version' => $version,
'enqueue' => isset( $this->enqueued_before_registered[ $id ] ),
'dependencies' => $dependencies,
);
}
}
/**
* Marks the script module to be enqueued in the page.
*
* If a src is provided and the script module has not been registered yet, it
* will be registered.
*
* @since 6.5.0
*
* @param string $id The identifier of the script module. Should be unique. It will be used in the
* final import map.
* @param string $src Optional. Full URL of the script module, or path of the script module relative
* to the WordPress root directory. If it is provided and the script module has
* not been registered yet, it will be registered.
* @param array $deps {
* Optional. List of dependencies.
*
* @type string|array ...$0 {
* An array of script module identifiers of the dependencies of this script
* module. The dependencies can be strings or arrays. If they are arrays,
* they need an `id` key with the script module identifier, and can contain
* an `import` key with either `static` or `dynamic`. By default,
* dependencies that don't contain an `import` key are considered static.
*
* @type string $id The script module identifier.
* @type string $import Optional. Import type. May be either `static` or
* `dynamic`. Defaults to `static`.
* }
* }
* @param string|false|null $version Optional. String specifying the script module version number. Defaults to false.
* It is added to the URL as a query string for cache busting purposes. If $version
* is set to false, the version number is the currently installed WordPress version.
* If $version is set to null, no version is added.
*/
public function enqueue( string $id, string $src = '', array $deps = array(), $version = false ) {
if ( isset( $this->registered[ $id ] ) ) {
$this->registered[ $id ]['enqueue'] = true;
} elseif ( $src ) {
$this->register( $id, $src, $deps, $version );
$this->registered[ $id ]['enqueue'] = true;
} else {
$this->enqueued_before_registered[ $id ] = true;
}
}
/**
* Unmarks the script module so it will no longer be enqueued in the page.
*
* @since 6.5.0
*
* @param string $id The identifier of the script module.
*/
public function dequeue( string $id ) {
if ( isset( $this->registered[ $id ] ) ) {
$this->registered[ $id ]['enqueue'] = false;
}
unset( $this->enqueued_before_registered[ $id ] );
}
/**
* Removes a registered script module.
*
* @since 6.5.0
*
* @param string $id The identifier of the script module.
*/
public function deregister( string $id ) {
unset( $this->registered[ $id ] );
unset( $this->enqueued_before_registered[ $id ] );
}
/**
* Adds the hooks to print the import map, enqueued script modules and script
* module preloads.
*
* In classic themes, the script modules used by the blocks are not yet known
* when the `wp_head` actions is fired, so it needs to print everything in the
* footer.
*
* @since 6.5.0
*/
public function add_hooks() {
$position = wp_is_block_theme() ? 'wp_head' : 'wp_footer';
add_action( $position, array( $this, 'print_import_map' ) );
add_action( $position, array( $this, 'print_enqueued_script_modules' ) );
add_action( $position, array( $this, 'print_script_module_preloads' ) );
add_action( 'admin_print_footer_scripts', array( $this, 'print_import_map' ) );
add_action( 'admin_print_footer_scripts', array( $this, 'print_enqueued_script_modules' ) );
add_action( 'admin_print_footer_scripts', array( $this, 'print_script_module_preloads' ) );
add_action( 'wp_footer', array( $this, 'print_script_module_data' ) );
add_action( 'admin_print_footer_scripts', array( $this, 'print_script_module_data' ) );
add_action( 'wp_footer', array( $this, 'print_a11y_script_module_html' ), 20 );
add_action( 'admin_print_footer_scripts', array( $this, 'print_a11y_script_module_html' ), 20 );
}
/**
* Prints the enqueued script modules using script tags with type="module"
* attributes.
*
* @since 6.5.0
*/
public function print_enqueued_script_modules() {
foreach ( $this->get_marked_for_enqueue() as $id => $script_module ) {
wp_print_script_tag(
array(
'type' => 'module',
'src' => $this->get_src( $id ),
'id' => $id . '-js-module',
)
);
}
}
/**
* Prints the the static dependencies of the enqueued script modules using
* link tags with rel="modulepreload" attributes.
*
* If a script module is marked for enqueue, it will not be preloaded.
*
* @since 6.5.0
*/
public function print_script_module_preloads() {
foreach ( $this->get_dependencies( array_keys( $this->get_marked_for_enqueue() ), array( 'static' ) ) as $id => $script_module ) {
// Don't preload if it's marked for enqueue.
if ( true !== $script_module['enqueue'] ) {
echo sprintf(
'<link rel="modulepreload" href="%s" id="%s">',
esc_url( $this->get_src( $id ) ),
esc_attr( $id . '-js-modulepreload' )
);
}
}
}
/**
* Prints the import map using a script tag with a type="importmap" attribute.
*
* @since 6.5.0
*/
public function print_import_map() {
$import_map = $this->get_import_map();
if ( ! empty( $import_map['imports'] ) ) {
wp_print_inline_script_tag(
wp_json_encode( $import_map, JSON_HEX_TAG | JSON_HEX_AMP ),
array(
'type' => 'importmap',
'id' => 'wp-importmap',
)
);
}
}
/**
* Returns the import map array.
*
* @since 6.5.0
*
* @return array Array with an `imports` key mapping to an array of script module identifiers and their respective
* URLs, including the version query.
*/
private function get_import_map(): array {
$imports = array();
foreach ( $this->get_dependencies( array_keys( $this->get_marked_for_enqueue() ) ) as $id => $script_module ) {
$imports[ $id ] = $this->get_src( $id );
}
return array( 'imports' => $imports );
}
/**
* Retrieves the list of script modules marked for enqueue.
*
* @since 6.5.0
*
* @return array[] Script modules marked for enqueue, keyed by script module identifier.
*/
private function get_marked_for_enqueue(): array {
$enqueued = array();
foreach ( $this->registered as $id => $script_module ) {
if ( true === $script_module['enqueue'] ) {
$enqueued[ $id ] = $script_module;
}
}
return $enqueued;
}
/**
* Retrieves all the dependencies for the given script module identifiers,
* filtered by import types.
*
* It will consolidate an array containing a set of unique dependencies based
* on the requested import types: 'static', 'dynamic', or both. This method is
* recursive and also retrieves dependencies of the dependencies.
*
* @since 6.5.0
*
* @param string[] $ids The identifiers of the script modules for which to gather dependencies.
* @param string[] $import_types Optional. Import types of dependencies to retrieve: 'static', 'dynamic', or both.
* Default is both.
* @return array[] List of dependencies, keyed by script module identifier.
*/
private function get_dependencies( array $ids, array $import_types = array( 'static', 'dynamic' ) ) {
return array_reduce(
$ids,
function ( $dependency_script_modules, $id ) use ( $import_types ) {
$dependencies = array();
foreach ( $this->registered[ $id ]['dependencies'] as $dependency ) {
if (
in_array( $dependency['import'], $import_types, true ) &&
isset( $this->registered[ $dependency['id'] ] ) &&
! isset( $dependency_script_modules[ $dependency['id'] ] )
) {
$dependencies[ $dependency['id'] ] = $this->registered[ $dependency['id'] ];
}
}
return array_merge( $dependency_script_modules, $dependencies, $this->get_dependencies( array_keys( $dependencies ), $import_types ) );
},
array()
);
}
/**
* Gets the versioned URL for a script module src.
*
* If $version is set to false, the version number is the currently installed
* WordPress version. If $version is set to null, no version is added.
* Otherwise, the string passed in $version is used.
*
* @since 6.5.0
*
* @param string $id The script module identifier.
* @return string The script module src with a version if relevant.
*/
private function get_src( string $id ): string {
if ( ! isset( $this->registered[ $id ] ) ) {
return '';
}
$script_module = $this->registered[ $id ];
$src = $script_module['src'];
if ( false === $script_module['version'] ) {
$src = add_query_arg( 'ver', get_bloginfo( 'version' ), $src );
} elseif ( null !== $script_module['version'] ) {
$src = add_query_arg( 'ver', $script_module['version'], $src );
}
/**
* Filters the script module source.
*
* @since 6.5.0
*
* @param string $src Module source URL.
* @param string $id Module identifier.
*/
$src = apply_filters( 'script_module_loader_src', $src, $id );
return $src;
}
/**
* Print data associated with Script Modules.
*
* The data will be embedded in the page HTML and can be read by Script Modules on page load.
*
* @since 6.7.0
*
* Data can be associated with a Script Module via the
* {@see "script_module_data_{$module_id}"} filter.
*
* The data for a Script Module will be serialized as JSON in a script tag with an ID of the
* form `wp-script-module-data-{$module_id}`.
*/
public function print_script_module_data(): void {
$modules = array();
foreach ( array_keys( $this->get_marked_for_enqueue() ) as $id ) {
if ( '@wordpress/a11y' === $id ) {
$this->a11y_available = true;
}
$modules[ $id ] = true;
}
foreach ( array_keys( $this->get_import_map()['imports'] ) as $id ) {
if ( '@wordpress/a11y' === $id ) {
$this->a11y_available = true;
}
$modules[ $id ] = true;
}
foreach ( array_keys( $modules ) as $module_id ) {
/**
* Filters data associated with a given Script Module.
*
* Script Modules may require data that is required for initialization or is essential
* to have immediately available on page load. These are suitable use cases for
* this data.
*
* The dynamic portion of the hook name, `$module_id`, refers to the Script Module ID
* that the data is associated with.
*
* This is best suited to pass essential data that must be available to the module for
* initialization or immediately on page load. It does not replace the REST API or
* fetching data from the client.
*
* Example:
*
* add_filter(
* 'script_module_data_MyScriptModuleID',
* function ( array $data ): array {
* $data['dataForClient'] = 'ok';
* return $data;
* }
* );
*
* If the filter returns no data (an empty array), nothing will be embedded in the page.
*
* The data for a given Script Module, if provided, will be JSON serialized in a script
* tag with an ID of the form `wp-script-module-data-{$module_id}`.
*
* The data can be read on the client with a pattern like this:
*
* Example:
*
* const dataContainer = document.getElementById( 'wp-script-module-data-MyScriptModuleID' );
* let data = {};
* if ( dataContainer ) {
* try {
* data = JSON.parse( dataContainer.textContent );
* } catch {}
* }
* // data.dataForClient === 'ok';
* initMyScriptModuleWithData( data );
*
* @since 6.7.0
*
* @param array $data The data associated with the Script Module.
*/
$data = apply_filters( "script_module_data_{$module_id}", array() );
if ( is_array( $data ) && array() !== $data ) {
/*
* This data will be printed as JSON inside a script tag like this:
* <script type="application/json"></script>
*
* A script tag must be closed by a sequence beginning with `</`. It's impossible to
* close a script tag without using `<`. We ensure that `<` is escaped and `/` can
* remain unescaped, so `</script>` will be printed as `\u003C/script\u00E3`.
*
* - JSON_HEX_TAG: All < and > are converted to \u003C and \u003E.
* - JSON_UNESCAPED_SLASHES: Don't escape /.
*
* If the page will use UTF-8 encoding, it's safe to print unescaped unicode:
*
* - JSON_UNESCAPED_UNICODE: Encode multibyte Unicode characters literally (instead of as `\uXXXX`).
* - JSON_UNESCAPED_LINE_TERMINATORS: The line terminators are kept unescaped when
* JSON_UNESCAPED_UNICODE is supplied. It uses the same behaviour as it was
* before PHP 7.1 without this constant. Available as of PHP 7.1.0.
*
* The JSON specification requires encoding in UTF-8, so if the generated HTML page
* is not encoded in UTF-8 then it's not safe to include those literals. They must
* be escaped to avoid encoding issues.
*
* @see https://www.rfc-editor.org/rfc/rfc8259.html for details on encoding requirements.
* @see https://www.php.net/manual/en/json.constants.php for details on these constants.
* @see https://html.spec.whatwg.org/#script-data-state for details on script tag parsing.
*/
$json_encode_flags = JSON_HEX_TAG | JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_LINE_TERMINATORS;
if ( ! is_utf8_charset() ) {
$json_encode_flags = JSON_HEX_TAG | JSON_UNESCAPED_SLASHES;
}
wp_print_inline_script_tag(
wp_json_encode(
$data,
$json_encode_flags
),
array(
'type' => 'application/json',
'id' => "wp-script-module-data-{$module_id}",
)
);
}
}
}
/**
* @access private This is only intended to be called by the registered actions.
*
* @since 6.7.0
*/
public function print_a11y_script_module_html() {
if ( ! $this->a11y_available ) {
return;
}
echo '<div style="position:absolute;margin:-1px;padding:0;height:1px;width:1px;overflow:hidden;clip-path:inset(50%);border:0;word-wrap:normal !important;">'
. '<p id="a11y-speak-intro-text" class="a11y-speak-intro-text" hidden>' . esc_html__( 'Notifications' ) . '</p>'
. '<div id="a11y-speak-assertive" class="a11y-speak-region" aria-live="assertive" aria-relevant="additions text" aria-atomic="true"></div>'
. '<div id="a11y-speak-polite" class="a11y-speak-region" aria-live="polite" aria-relevant="additions text" aria-atomic="true"></div>'
. '</div>';
}
}