WordPress/wp-content/themes/twentytwenty/classes/class-twentytwenty-script-l...

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<?php
/**
* Javascript Loader Class
*
* Allow `async` and `defer` while enqueuing Javascript.
*
* Based on a solution in WP Rig.
*
* @package WordPress
* @subpackage Twenty_Twenty
* @since Twenty Twenty 1.0
*/
if ( ! class_exists( 'TwentyTwenty_Script_Loader' ) ) {
/**
* A class that provides a way to add `async` or `defer` attributes to scripts.
*
* @since Twenty Twenty 1.0
*/
class TwentyTwenty_Script_Loader {
/**
* Migrates legacy async/defer script data which might be used by child themes.
*
* This method is used on the `print_scripts_array` filter.
*
* @since Twenty Twenty 2.0
*
* @param string[] $to_do An array of script dependency handles.
* @return string[] Unchanged array of script dependency handles.
*/
public function migrate_legacy_strategy_script_data( $to_do ) {
foreach ( $to_do as $handle ) {
foreach ( array( 'async', 'defer' ) as $strategy ) {
if ( wp_scripts()->get_data( $handle, $strategy ) ) {
wp_script_add_data( $handle, 'strategy', $strategy );
}
}
}
return $to_do;
}
/**
* Adds async/defer attributes to enqueued / registered scripts.
*
* Now that #12009 has landed in WordPress 6.3, this method is only used for older versions of WordPress.
* This method is used on the `script_loader_tag` filter.
*
* @since Twenty Twenty 1.0
*
* @link https://core.trac.wordpress.org/ticket/12009
*
* @param string $tag The script tag.
* @param string $handle The script handle.
* @return string Script HTML string.
*/
public function filter_script_loader_tag( $tag, $handle ) {
$strategies = array(
'async' => (bool) wp_scripts()->get_data( $handle, 'async' ),
'defer' => (bool) wp_scripts()->get_data( $handle, 'defer' ),
);
$strategy = wp_scripts()->get_data( $handle, 'strategy' );
if ( $strategy && isset( $strategies[ $strategy ] ) ) {
$strategies[ $strategy ] = true;
}
foreach ( array_keys( array_filter( $strategies ) ) as $attr ) {
// Prevent adding attribute when already added in #12009.
if ( ! preg_match( ":\s$attr(=|>|\s):", $tag ) ) {
$tag = preg_replace( ':(?=></script>):', " $attr", $tag, 1 );
}
// Only allow async or defer, not both.
break;
}
return $tag;
}
}
}