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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; } } }