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<title>[59213] trunk: Themes: Improve performance of applying background image styles in `theme.json`.</title>
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<dt style="float: left; width: 6em; font-weight: bold">Revision</dt> <dd><a style="font-weight: bold" href="https://core.trac.wordpress.org/changeset/59213">59213</a><script type="application/ld+json">{"@context":"http://schema.org","@type":"EmailMessage","description":"Review this Commit","action":{"@type":"ViewAction","url":"https://core.trac.wordpress.org/changeset/59213","name":"Review Commit"}}</script></dd>
<dt style="float: left; width: 6em; font-weight: bold">Author</dt> <dd>flixos90</dd>
<dt style="float: left; width: 6em; font-weight: bold">Date</dt> <dd>2024-10-10 21:05:04 +0000 (Thu, 10 Oct 2024)</dd>
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<pre style='padding-left: 1em; margin: 2em 0; border-left: 2px solid #ccc; line-height: 1.25; font-size: 105%; font-family: sans-serif'>Themes: Improve performance of applying background image styles in `theme.json`.

The cost of using `WP_Theme_JSON::get_block_nodes()` for this in its original shape was high enough to lead to a performance regression. Therefore this changeset introduces a new option on the method that allows to bypass all logic except for retrieving the node paths, which is much faster and everything that this functionality needs.

Follow up to <a href="https://core.trac.wordpress.org/changeset/58936">[58936]</a>.

Props mukesh27, flixos90, ramonopoly, joemcgill, andrewserong, swissspidy.
Fixes <a href="https://core.trac.wordpress.org/ticket/61858">#61858</a>.</pre>

<h3>Modified Paths</h3>
<ul>
<li><a href="#trunksrcwpincludesclasswpthemejsonphp">trunk/src/wp-includes/class-wp-theme-json.php</a></li>
<li><a href="#trunktestsphpunitteststhemewpThemeJsonphp">trunk/tests/phpunit/tests/theme/wpThemeJson.php</a></li>
</ul>

</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunksrcwpincludesclasswpthemejsonphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/src/wp-includes/class-wp-theme-json.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-includes/class-wp-theme-json.php     2024-10-10 18:06:13 UTC (rev 59212)
+++ trunk/src/wp-includes/class-wp-theme-json.php       2024-10-10 21:05:04 UTC (rev 59213)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -2690,6 +2690,7 @@
</span><span class="cx" style="display: block; padding: 0 10px">         * @since 6.1.0
</span><span class="cx" style="display: block; padding: 0 10px">         * @since 6.3.0 Refactored and stabilized selectors API.
</span><span class="cx" style="display: block; padding: 0 10px">         * @since 6.6.0 Added optional selectors and options for generating block nodes.
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+         * @since 6.7.0 Added $include_node_paths_only option.
</ins><span class="cx" style="display: block; padding: 0 10px">          *
</span><span class="cx" style="display: block; padding: 0 10px">         * @param array $theme_json The theme.json converted to an array.
</span><span class="cx" style="display: block; padding: 0 10px">         * @param array $selectors  Optional list of selectors per block.
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -2696,7 +2697,8 @@
</span><span class="cx" style="display: block; padding: 0 10px">         * @param array $options {
</span><span class="cx" style="display: block; padding: 0 10px">         *     Optional. An array of options for now used for internal purposes only (may change without notice).
</span><span class="cx" style="display: block; padding: 0 10px">         *
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-         *     @type bool   $include_block_style_variations  Includes nodes for block style variations. Default false.
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+  *     @type bool $include_block_style_variations Include nodes for block style variations. Default false.
+        *     @type bool $include_node_paths_only        Return only block nodes node paths. Default false.
</ins><span class="cx" style="display: block; padding: 0 10px">          * }
</span><span class="cx" style="display: block; padding: 0 10px">         * @return array The block nodes in theme.json.
</span><span class="cx" style="display: block; padding: 0 10px">         */
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -2712,48 +2714,65 @@
</span><span class="cx" style="display: block; padding: 0 10px">                        return $nodes;
</span><span class="cx" style="display: block; padding: 0 10px">                }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                $include_variations      = $options['include_block_style_variations'] ?? false;
+               $include_node_paths_only = $options['include_node_paths_only'] ?? false;
+
</ins><span class="cx" style="display: block; padding: 0 10px">                 foreach ( $theme_json['styles']['blocks'] as $name => $node ) {
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                        $selector = null;
-                       if ( isset( $selectors[ $name ]['selector'] ) ) {
-                               $selector = $selectors[ $name ]['selector'];
-                       }
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                 $node_path = array( 'styles', 'blocks', $name );
+                       if ( $include_node_paths_only ) {
+                               $nodes[] = array(
+                                       'path' => $node_path,
+                               );
+                       } else {
+                               $selector = null;
+                               if ( isset( $selectors[ $name ]['selector'] ) ) {
+                                       $selector = $selectors[ $name ]['selector'];
+                               }
</ins><span class="cx" style="display: block; padding: 0 10px"> 
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                        $duotone_selector = null;
-                       if ( isset( $selectors[ $name ]['duotone'] ) ) {
-                               $duotone_selector = $selectors[ $name ]['duotone'];
-                       }
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                         $duotone_selector = null;
+                               if ( isset( $selectors[ $name ]['duotone'] ) ) {
+                                       $duotone_selector = $selectors[ $name ]['duotone'];
+                               }
</ins><span class="cx" style="display: block; padding: 0 10px"> 
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                        $feature_selectors = null;
-                       if ( isset( $selectors[ $name ]['selectors'] ) ) {
-                               $feature_selectors = $selectors[ $name ]['selectors'];
-                       }
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                         $feature_selectors = null;
+                               if ( isset( $selectors[ $name ]['selectors'] ) ) {
+                                       $feature_selectors = $selectors[ $name ]['selectors'];
+                               }
</ins><span class="cx" style="display: block; padding: 0 10px"> 
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                        $variation_selectors = array();
-                       $include_variations  = $options['include_block_style_variations'] ?? false;
-                       if ( $include_variations && isset( $node['variations'] ) ) {
-                               foreach ( $node['variations'] as $variation => $node ) {
-                                       $variation_selectors[] = array(
-                                               'path'     => array( 'styles', 'blocks', $name, 'variations', $variation ),
-                                               'selector' => $selectors[ $name ]['styleVariations'][ $variation ],
-                                       );
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                         $variation_selectors = array();
+                               if ( $include_variations && isset( $node['variations'] ) ) {
+                                       foreach ( $node['variations'] as $variation => $node ) {
+                                               $variation_selectors[] = array(
+                                                       'path'     => array( 'styles', 'blocks', $name, 'variations', $variation ),
+                                                       'selector' => $selectors[ $name ]['styleVariations'][ $variation ],
+                                               );
+                                       }
</ins><span class="cx" style="display: block; padding: 0 10px">                                 }
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+
+                               $nodes[] = array(
+                                       'name'       => $name,
+                                       'path'       => $node_path,
+                                       'selector'   => $selector,
+                                       'selectors'  => $feature_selectors,
+                                       'duotone'    => $duotone_selector,
+                                       'features'   => $feature_selectors,
+                                       'variations' => $variation_selectors,
+                                       'css'        => $selector,
+                               );
</ins><span class="cx" style="display: block; padding: 0 10px">                         }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                        $nodes[] = array(
-                               'name'       => $name,
-                               'path'       => array( 'styles', 'blocks', $name ),
-                               'selector'   => $selector,
-                               'selectors'  => $feature_selectors,
-                               'duotone'    => $duotone_selector,
-                               'features'   => $feature_selectors,
-                               'variations' => $variation_selectors,
-                               'css'        => $selector,
-                       );
-
</del><span class="cx" style="display: block; padding: 0 10px">                         if ( isset( $theme_json['styles']['blocks'][ $name ]['elements'] ) ) {
</span><span class="cx" style="display: block; padding: 0 10px">                                foreach ( $theme_json['styles']['blocks'][ $name ]['elements'] as $element => $node ) {
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                                        $node_path = array( 'styles', 'blocks', $name, 'elements', $element );
+                                       if ( $include_node_paths_only ) {
+                                               $nodes[] = array(
+                                                       'path' => $node_path,
+                                               );
+                                               continue;
+                                       }
+
</ins><span class="cx" style="display: block; padding: 0 10px">                                         $nodes[] = array(
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                                                'path'     => array( 'styles', 'blocks', $name, 'elements', $element ),
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                                         'path'     => $node_path,
</ins><span class="cx" style="display: block; padding: 0 10px">                                                 'selector' => $selectors[ $name ]['elements'][ $element ],
</span><span class="cx" style="display: block; padding: 0 10px">                                        );
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -2761,8 +2780,16 @@
</span><span class="cx" style="display: block; padding: 0 10px">                                        if ( isset( static::VALID_ELEMENT_PSEUDO_SELECTORS[ $element ] ) ) {
</span><span class="cx" style="display: block; padding: 0 10px">                                                foreach ( static::VALID_ELEMENT_PSEUDO_SELECTORS[ $element ] as $pseudo_selector ) {
</span><span class="cx" style="display: block; padding: 0 10px">                                                        if ( isset( $theme_json['styles']['blocks'][ $name ]['elements'][ $element ][ $pseudo_selector ] ) ) {
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                                                                $node_path = array( 'styles', 'blocks', $name, 'elements', $element );
+                                                               if ( $include_node_paths_only ) {
+                                                                       $nodes[] = array(
+                                                                               'path' => $node_path,
+                                                                       );
+                                                                       continue;
+                                                               }
+
</ins><span class="cx" style="display: block; padding: 0 10px">                                                                 $nodes[] = array(
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                                                                        'path'     => array( 'styles', 'blocks', $name, 'elements', $element ),
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                                                                 'path'     => $node_path,
</ins><span class="cx" style="display: block; padding: 0 10px">                                                                         'selector' => static::append_to_selector( $selectors[ $name ]['elements'][ $element ], $pseudo_selector ),
</span><span class="cx" style="display: block; padding: 0 10px">                                                                );
</span><span class="cx" style="display: block; padding: 0 10px">                                                        }
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -3236,7 +3263,11 @@
</span><span class="cx" style="display: block; padding: 0 10px">                 * some values provide exceptions, namely style values that are
</span><span class="cx" style="display: block; padding: 0 10px">                 * objects and represent unique definitions for the style.
</span><span class="cx" style="display: block; padding: 0 10px">                 */
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                $style_nodes = static::get_styles_block_nodes();
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+         $style_nodes = static::get_block_nodes(
+                       $this->theme_json,
+                       array(),
+                       array( 'include_node_paths_only' => true )
+               );
</ins><span class="cx" style="display: block; padding: 0 10px">                 foreach ( $style_nodes as $style_node ) {
</span><span class="cx" style="display: block; padding: 0 10px">                        $path = $style_node['path'];
</span><span class="cx" style="display: block; padding: 0 10px">                        /*
</span></span></pre></div>
<a id="trunktestsphpunitteststhemewpThemeJsonphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/tests/phpunit/tests/theme/wpThemeJson.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/tests/phpunit/tests/theme/wpThemeJson.php   2024-10-10 18:06:13 UTC (rev 59212)
+++ trunk/tests/phpunit/tests/theme/wpThemeJson.php     2024-10-10 21:05:04 UTC (rev 59213)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -2444,6 +2444,60 @@
</span><span class="cx" style="display: block; padding: 0 10px">        }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">        /**
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+         * This test covers `get_block_nodes` with the `$include_node_paths_only` option.
+        * When `true`, `$include_node_paths_only` should return only the paths of the block nodes.
+        *
+        * @ticket 61858
+        */
+       public function test_return_block_node_paths() {
+               $theme_json = new ReflectionClass( 'WP_Theme_JSON' );
+
+               $func = $theme_json->getMethod( 'get_block_nodes' );
+               $func->setAccessible( true );
+
+               $theme_json = array(
+                       'version' => WP_Theme_JSON::LATEST_SCHEMA,
+                       'styles'  => array(
+                               'typography' => array(
+                                       'fontSize' => '16px',
+                               ),
+                               'blocks'     => array(
+                                       'core/button' => array(
+                                               'color' => array(
+                                                       'background' => 'red',
+                                               ),
+                                       ),
+                                       'core/group'  => array(
+                                               'elements' => array(
+                                                       'link' => array(
+                                                               'color' => array(
+                                                                       'background' => 'blue',
+                                                               ),
+                                                       ),
+                                               ),
+                                       ),
+                               ),
+                       ),
+               );
+
+               $block_nodes = $func->invoke( null, $theme_json, array(), array( 'include_node_paths_only' => true ) );
+
+               $expected = array(
+                       array(
+                               'path' => array( 'styles', 'blocks', 'core/button' ),
+                       ),
+                       array(
+                               'path' => array( 'styles', 'blocks', 'core/group' ),
+                       ),
+                       array(
+                               'path' => array( 'styles', 'blocks', 'core/group', 'elements', 'link' ),
+                       ),
+               );
+
+               $this->assertEquals( $expected, $block_nodes );
+       }
+
+       /**
</ins><span class="cx" style="display: block; padding: 0 10px">          * @ticket 54336
</span><span class="cx" style="display: block; padding: 0 10px">         */
</span><span class="cx" style="display: block; padding: 0 10px">        public function test_remove_insecure_properties_removes_unsafe_styles() {
</span></span></pre>
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