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✏️ Editing: async-css.php

<?php
defined( 'ABSPATH' ) or	die( 'Cheatin&#8217; uh?' );

/**
 * Defer loading of CSS files
 *
 * @since 2.10
 * @author Remy Perona
 *
 * @param string $buffer HTML code.
 * @return string Updated HTML code
 */
function rocket_async_css( $buffer ) {
	if ( ! get_rocket_option( 'async_css' ) ) {
		return $buffer;
	}

if ( is_rocket_post_excluded_option( 'async_css' ) ) {
		return $buffer;
	}

$excluded_css = array_flip( get_rocket_exclude_async_css() );

// Get all css files with this regex.
	preg_match_all( apply_filters( 'rocket_async_css_regex_pattern', '/(?=<link[^>]*\s(rel\s*=\s*[\'"]stylesheet["\']))<link[^>]*\shref\s*=\s*[\'"]([^\'"]+)[\'"](.*)>/iU' ), $buffer, $tags_match );

if ( ! isset( $tags_match[0] ) ) {
		return $buffer;
	}

$noscripts = '';

foreach ( $tags_match[0] as $i => $tag ) {
		// Strip query args.
		$path = parse_url( $tags_match[2][ $i ] , PHP_URL_PATH );

// Check if this file should be deferred.
		if ( isset( $excluded_css[ $path ] ) ) {
			continue;
		}

$preload = str_replace( 'stylesheet', 'preload', $tags_match[1][ $i ] );
	    $onload  = str_replace( $tags_match[3][ $i ], ' as="style" onload=""' . $tags_match[3][ $i ] . '>', $tags_match[3][ $i ] );
	    $tag	 = str_replace( $tags_match[3][ $i ] . '>', $onload, $tag );
	    $tag	 = str_replace( $tags_match[1][ $i ], $preload, $tag );
	    $tag 	 = str_replace( 'onload=""', 'onload="this.rel=\'stylesheet\'"', $tag );
	    $buffer  = str_replace( $tags_match[0][ $i ], $tag, $buffer );

$noscripts .= '<noscript>' . $tags_match[0][ $i ] . '</noscript>';
	}

$buffer = str_replace( '</body>', $noscripts . '</body>', $buffer );

return $buffer;
}
add_filter( 'rocket_buffer', 'rocket_async_css', 15 );

/**
 * Insert critical CSS in the <head>
 *
 * @since 2.10
 * @author Remy Perona
 */
function rocket_insert_critical_css() {
	global $pagenow;

if ( ! get_rocket_option( 'async_css' ) ) {
		return;
	}

if ( is_rocket_post_excluded_option( 'async_css' ) ) {
		return;
	}

// Don't apply on wp-login.php/wp-register.php.
	if ( in_array( $pagenow, array( 'wp-login.php', 'wp-register.php' ), true ) ) {
		return;
	}

// Don't apply if DONOTCACHEPAGE is defined.
	if ( defined( 'DONOTCACHEPAGE' ) && DONOTCACHEPAGE ) {
		return;
	}

if ( defined( 'DONOTASYNCCSS' ) && DONOTASYNCCSS ) {
		return;
	}

// Don't apply if user is logged-in and cache for logged-in user is off.
	if ( is_user_logged_in() && ! get_rocket_option( 'cache_logged_user' ) ) {
		return;
	}

// This filter is documented in inc/front/process.php.
	$rocket_cache_search = apply_filters( 'rocket_cache_search', false );

// Don't apply on search page.
	if ( is_search() && ! $rocket_cache_search ) {
		return;
	}

// Don't apply on excluded pages.
	if ( in_array( $_SERVER['REQUEST_URI'] , get_rocket_option( 'cache_reject_uri' , array() ), true ) ) {
		return;
	}

// Don't apply on 404 page.
	if ( is_404() ) {
		return;
	}

$critical_css = wp_kses( get_rocket_option( 'critical_css' ), array( '\'', '\"' ) );
	$critical_css = str_replace( '&gt;', '>', $critical_css );

echo '<style id="rocket-critical-css">' . $critical_css . '</style>';
}
add_action( 'wp_head', 'rocket_insert_critical_css', 1 );

/**
 * Insert loadCSS script in <head>
 *
 * @since 2.10
 * @author Remy Perona
 */
function rocket_insert_load_css() {
	global $pagenow;