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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.
*/
class TwentyTwenty_Script_Loader {
/**
* Adds async/defer attributes to enqueued / registered scripts.
*
* If #12009 lands in WordPress, this function can no-op since it would be handled in core.
*
* @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 ) {
foreach ( array( 'async', 'defer' ) as $attr ) {
if ( ! wp_scripts()->get_data( $handle, $attr ) ) {
continue;
}
// Prevent adding attribute when already added in #12009.
if ( ! preg_match( ":\s$attr(=|>|\s):", $tag ) ) {
$tag = preg_replace( ':(?=></script>):', " $attr", $tag, 1 );
}
// Only allow async or defer, not both.
break;
}
return $tag;
}
}
}
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