60 lines
1.6 KiB
PHP
60 lines
1.6 KiB
PHP
<?php
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defined( 'ABSPATH' ) || exit;
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/**
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* Defer all JS files.
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*
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* @since 2.10
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* @author Remy Perona
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*
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* @param string $buffer HTML content.
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* @return string Updated HTML content
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*/
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function rocket_defer_js( $buffer ) {
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if ( ( defined( 'DONOTROCKETOPTIMIZE' ) && DONOTROCKETOPTIMIZE ) || ( defined( 'DONOTASYNCCSS' ) && DONOTASYNCCSS ) ) {
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return;
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}
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if ( ! get_rocket_option( 'defer_all_js' ) ) {
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return $buffer;
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}
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if ( is_rocket_post_excluded_option( 'defer_all_js' ) ) {
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return $buffer;
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}
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$buffer_nocomments = preg_replace( '/<!--(.*)-->/Uis', '', $buffer );
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// Get all JS files with this regex.
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preg_match_all( '#<script\s+([^>]+[\s\'"])?src\s*=\s*[\'"]\s*?([^\'"]+\.js(?:\?[^\'"]*)?)\s*?[\'"]([^>]+)?\/?>#iU', $buffer_nocomments, $tags_match );
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if ( ! isset( $tags_match[0] ) ) {
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return $buffer;
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}
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$exclude_defer_js = implode( '|', get_rocket_exclude_defer_js() );
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foreach ( $tags_match[0] as $i => $tag ) {
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// Check if this file should be deferred.
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if ( preg_match( '#(' . $exclude_defer_js . ')#i', $tags_match[2][ $i ] ) ) {
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continue;
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}
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// Don't add defer if already async.
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if ( false !== strpos( $tags_match[1][ $i ], 'async' ) || false !== strpos( $tags_match[3][ $i ], 'async' ) ) {
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continue;
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}
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// Don't add defer if already defer.
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if ( false !== strpos( $tags_match[1][ $i ], 'defer' ) || false !== strpos( $tags_match[3][ $i ], 'defer' ) ) {
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continue;
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}
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$deferred_tag = str_replace( '>', ' defer>', $tag );
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$buffer = str_replace( $tag, $deferred_tag, $buffer );
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}
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return $buffer;
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}
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add_filter( 'rocket_buffer', 'rocket_defer_js', 24 );
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