Changeset 55658 for trunk/src/wp-includes/script-loader.php

Timestamp:

04/19/2023 01:24:40 AM (20 months ago)

Author:

westonruter

Message:

Script Loader: Optimize performance of _wp_normalize_relative_css_links() by more than 2x.

• Replace preg_match_all() and its secondary str_replace() call with preg_replace_callback().
• Fix case where paths beginning with http and https (but not http: and https:) were erroneously not counted as relative.
• Improve code style and readability by consolidating conditions and returning once.
• Use str_starts_with() consistently instead of strpos().

Follow-up to [52036], [52695], and [52754].

Fixes #58069.
See #54243.

File:

• trunk/src/wp-includes/script-loader.php (modified) (1 diff)

trunk/src/wp-includes/script-loader.php

@@ -2940 +2940 @@
  */
 function _wp_normalize_relative_css_links( $css, $stylesheet_url ) {
-    $has_src_results = preg_match_all( '#url\s*\(\s*[\'"]?\s*([^\'"\)]+)#', $css, $src_results );
-    if ( $has_src_results ) {
-        // Loop through the URLs to find relative ones.
-        foreach ( $src_results[1] as $src_index => $src_result ) {
-            // Skip if this is an absolute URL.
-            if ( 0 === strpos( $src_result, 'http' ) || 0 === strpos( $src_result, '//' ) ) {
-                continue;
+    return preg_replace_callback(
+        '#(url\s*\(\s*[\'"]?\s*)([^\'"\)]+)#',
+        static function ( $matches ) use ( $stylesheet_url ) {
+            list( , $prefix, $url ) = $matches;
+
+            if ( ! (
+                str_starts_with( $url, 'http:' )
+                ||
+                str_starts_with( $url, 'https:' )
+                ||
+                str_starts_with( $url, '//' )
+                ||
+                str_starts_with( $url, '#' )
+                ||
+                str_starts_with( $url, 'data:' )
+            ) ) {
+                // Build the absolute URL.
+                $absolute_url = dirname( $stylesheet_url ) . '/' . $url;
+                $absolute_url = str_replace( '/./', '/', $absolute_url );
+
+                // Convert to URL related to the site root.
+                $url = wp_make_link_relative( $absolute_url );
             }
 
-            // Skip if the URL is an HTML ID.
-            if ( str_starts_with( $src_result, '#' ) ) {
-                continue;
-            }
-
-            // Skip if the URL is a data URI.
-            if ( str_starts_with( $src_result, 'data:' ) ) {
-                continue;
-            }
-
-            // Build the absolute URL.
-            $absolute_url = dirname( $stylesheet_url ) . '/' . $src_result;
-            $absolute_url = str_replace( '/./', '/', $absolute_url );
-            // Convert to URL related to the site root.
-            $relative_url = wp_make_link_relative( $absolute_url );
-
-            // Replace the URL in the CSS.
-            $css = str_replace(
-                $src_results[0][ $src_index ],
-                str_replace( $src_result, $relative_url, $src_results[0][ $src_index ] ),
-                $css
-            );
-        }
-    }
-
-    return $css;
+            return $prefix . $url;
+        },
+        $css
+    );
 }