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1 <?php 2 /** 3 * Javascript Loader Class 4 * 5 * Allow `async` and `defer` while enqueuing Javascript. 6 * 7 * Based on a solution in WP Rig. 8 * 9 * @package WordPress 10 * @subpackage Twenty_Twenty 11 * @since Twenty Twenty 1.0 12 */ 13 14 if ( ! class_exists( 'TwentyTwenty_Script_Loader' ) ) { 15 /** 16 * A class that provides a way to add `async` or `defer` attributes to scripts. 17 */ 18 class TwentyTwenty_Script_Loader { 19 20 /** 21 * Adds async/defer attributes to enqueued / registered scripts. 22 * 23 * If #12009 lands in WordPress, this function can no-op since it would be handled in core. 24 * 25 * @link https://core.trac.wordpress.org/ticket/12009 26 * 27 * @param string $tag The script tag. 28 * @param string $handle The script handle. 29 * @return string Script HTML string. 30 */ 31 public function filter_script_loader_tag( $tag, $handle ) { 32 foreach ( [ 'async', 'defer' ] as $attr ) { 33 if ( ! wp_scripts()->get_data( $handle, $attr ) ) { 34 continue; 35 } 36 // Prevent adding attribute when already added in #12009. 37 if ( ! preg_match( ":\s$attr(=|>|\s):", $tag ) ) { 38 $tag = preg_replace( ':(?=></script>):', " $attr", $tag, 1 ); 39 } 40 // Only allow async or defer, not both. 41 break; 42 } 43 return $tag; 44 } 45 46 } 47 }
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