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<title>[55236] trunk: Themes: Add caching to `WP_Theme::is_block_theme()`.</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/55236">55236</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/55236","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>2023-02-06 19:57:41 +0000 (Mon, 06 Feb 2023)</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: Add caching to `WP_Theme::is_block_theme()`.

This changeset adds a `block_theme` entry in the theme cache data, similar to the existing entries `headers`, `errors`, `stylesheet`, and `template`.

Props spacedmonkey, costdev, joemcgill, flixos90, mukesh27, adamsilverstein.
Fixes <a href="https://core.trac.wordpress.org/ticket/57114">#57114</a>.</pre>

<h3>Modified Paths</h3>
<ul>
<li><a href="#trunksrcwpincludesclasswpthemephp">trunk/src/wp-includes/class-wp-theme.php</a></li>
<li><a href="#trunktestsphpunitteststhemewpThemephp">trunk/tests/phpunit/tests/theme/wpTheme.php</a></li>
</ul>

</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunksrcwpincludesclasswpthemephp"></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.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-includes/class-wp-theme.php  2023-02-06 19:41:25 UTC (rev 55235)
+++ trunk/src/wp-includes/class-wp-theme.php    2023-02-06 19:57:41 UTC (rev 55236)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -114,6 +114,14 @@
</span><span class="cx" style="display: block; padding: 0 10px">        private $headers_sanitized;
</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">+         * Is this theme a block theme.
+        *
+        * @since 6.2.0
+        * @var bool
+        */
+       private $block_theme;
+
+       /**
</ins><span class="cx" style="display: block; padding: 0 10px">          * Header name from the theme's style.css after being translated.
</span><span class="cx" style="display: block; padding: 0 10px">         *
</span><span class="cx" style="display: block; padding: 0 10px">         * Cached due to sorting functions running over the translated name.
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -250,7 +258,7 @@
</span><span class="cx" style="display: block; padding: 0 10px">                $cache = $this->cache_get( 'theme' );
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">                if ( is_array( $cache ) ) {
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                        foreach ( array( 'errors', 'headers', 'template' ) as $key ) {
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                 foreach ( array( 'block_theme', 'errors', 'headers', 'template' ) as $key ) {
</ins><span class="cx" style="display: block; padding: 0 10px">                                 if ( isset( $cache[ $key ] ) ) {
</span><span class="cx" style="display: block; padding: 0 10px">                                        $this->$key = $cache[ $key ];
</span><span class="cx" style="display: block; padding: 0 10px">                                }
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -275,14 +283,16 @@
</span><span class="cx" style="display: block; padding: 0 10px">                        } else {
</span><span class="cx" style="display: block; padding: 0 10px">                                $this->errors = new WP_Error( 'theme_no_stylesheet', __( 'Stylesheet is missing.' ) );
</span><span class="cx" style="display: block; padding: 0 10px">                        }
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                        $this->template = $this->stylesheet;
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                 $this->template    = $this->stylesheet;
+                       $this->block_theme = false;
</ins><span class="cx" style="display: block; padding: 0 10px">                         $this->cache_add(
</span><span class="cx" style="display: block; padding: 0 10px">                                'theme',
</span><span class="cx" style="display: block; padding: 0 10px">                                array(
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                                        'headers'    => $this->headers,
-                                       'errors'     => $this->errors,
-                                       'stylesheet' => $this->stylesheet,
-                                       'template'   => $this->template,
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                                 'block_theme' => $this->block_theme,
+                                       'headers'     => $this->headers,
+                                       'errors'      => $this->errors,
+                                       'stylesheet'  => $this->stylesheet,
+                                       'template'    => $this->template,
</ins><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">                        if ( ! file_exists( $this->theme_root ) ) { // Don't cache this one.
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -293,13 +303,15 @@
</span><span class="cx" style="display: block; padding: 0 10px">                        $this->headers['Name'] = $this->stylesheet;
</span><span class="cx" style="display: block; padding: 0 10px">                        $this->errors          = new WP_Error( 'theme_stylesheet_not_readable', __( 'Stylesheet is not readable.' ) );
</span><span class="cx" style="display: block; padding: 0 10px">                        $this->template        = $this->stylesheet;
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                        $this->block_theme     = false;
</ins><span class="cx" style="display: block; padding: 0 10px">                         $this->cache_add(
</span><span class="cx" style="display: block; padding: 0 10px">                                'theme',
</span><span class="cx" style="display: block; padding: 0 10px">                                array(
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                                        'headers'    => $this->headers,
-                                       'errors'     => $this->errors,
-                                       'stylesheet' => $this->stylesheet,
-                                       'template'   => $this->template,
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                                 'block_theme' => $this->block_theme,
+                                       'headers'     => $this->headers,
+                                       'errors'      => $this->errors,
+                                       'stylesheet'  => $this->stylesheet,
+                                       'template'    => $this->template,
</ins><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">                        return;
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -327,9 +339,10 @@
</span><span class="cx" style="display: block; padding: 0 10px">                        $this->cache_add(
</span><span class="cx" style="display: block; padding: 0 10px">                                'theme',
</span><span class="cx" style="display: block; padding: 0 10px">                                array(
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                                        'headers'    => $this->headers,
-                                       'errors'     => $this->errors,
-                                       'stylesheet' => $this->stylesheet,
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                                 'block_theme' => $this->is_block_theme(),
+                                       'headers'     => $this->headers,
+                                       'errors'      => $this->errors,
+                                       'stylesheet'  => $this->stylesheet,
</ins><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><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -363,10 +376,11 @@
</span><span class="cx" style="display: block; padding: 0 10px">                                $this->cache_add(
</span><span class="cx" style="display: block; padding: 0 10px">                                        'theme',
</span><span class="cx" style="display: block; padding: 0 10px">                                        array(
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                                                'headers'    => $this->headers,
-                                               'errors'     => $this->errors,
-                                               'stylesheet' => $this->stylesheet,
-                                               'template'   => $this->template,
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                                         'block_theme' => $this->is_block_theme(),
+                                               'headers'     => $this->headers,
+                                               'errors'      => $this->errors,
+                                               'stylesheet'  => $this->stylesheet,
+                                               'template'    => $this->template,
</ins><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">                                return;
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -399,10 +413,11 @@
</span><span class="cx" style="display: block; padding: 0 10px">                                $this->cache_add(
</span><span class="cx" style="display: block; padding: 0 10px">                                        'theme',
</span><span class="cx" style="display: block; padding: 0 10px">                                        array(
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                                                'headers'    => $this->headers,
-                                               'errors'     => $this->errors,
-                                               'stylesheet' => $this->stylesheet,
-                                               'template'   => $this->template,
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                                         'block_theme' => $this->is_block_theme(),
+                                               'headers'     => $this->headers,
+                                               'errors'      => $this->errors,
+                                               'stylesheet'  => $this->stylesheet,
+                                               'template'    => $this->template,
</ins><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">                                $this->parent = new WP_Theme( $this->template, $this->theme_root, $this );
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -426,10 +441,11 @@
</span><span class="cx" style="display: block; padding: 0 10px">                                $_child->cache_add(
</span><span class="cx" style="display: block; padding: 0 10px">                                        'theme',
</span><span class="cx" style="display: block; padding: 0 10px">                                        array(
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                                                'headers'    => $_child->headers,
-                                               'errors'     => $_child->errors,
-                                               'stylesheet' => $_child->stylesheet,
-                                               'template'   => $_child->template,
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                                         'block_theme' => $_child->is_block_theme(),
+                                               'headers'     => $_child->headers,
+                                               'errors'      => $_child->errors,
+                                               'stylesheet'  => $_child->stylesheet,
+                                               'template'    => $_child->template,
</ins><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">                                // The two themes actually reference each other with the Template header.
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -445,10 +461,11 @@
</span><span class="cx" style="display: block; padding: 0 10px">                                        $this->cache_add(
</span><span class="cx" style="display: block; padding: 0 10px">                                                'theme',
</span><span class="cx" style="display: block; padding: 0 10px">                                                array(
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                                                        'headers'    => $this->headers,
-                                                       'errors'     => $this->errors,
-                                                       'stylesheet' => $this->stylesheet,
-                                                       'template'   => $this->template,
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                                                 'block_theme' => $this->is_block_theme(),
+                                                       'headers'     => $this->headers,
+                                                       'errors'      => $this->errors,
+                                                       'stylesheet'  => $this->stylesheet,
+                                                       'template'    => $this->template,
</ins><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><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -465,10 +482,11 @@
</span><span class="cx" style="display: block; padding: 0 10px">                // We're good. If we didn't retrieve from cache, set it.
</span><span class="cx" style="display: block; padding: 0 10px">                if ( ! is_array( $cache ) ) {
</span><span class="cx" style="display: block; padding: 0 10px">                        $cache = array(
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                                'headers'    => $this->headers,
-                               'errors'     => $this->errors,
-                               'stylesheet' => $this->stylesheet,
-                               'template'   => $this->template,
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                         'block_theme' => $this->is_block_theme(),
+                               'headers'     => $this->headers,
+                               'errors'      => $this->errors,
+                               'stylesheet'  => $this->stylesheet,
+                               'template'    => $this->template,
</ins><span class="cx" style="display: block; padding: 0 10px">                         );
</span><span class="cx" style="display: block; padding: 0 10px">                        // If the parent theme is in another root, we'll want to cache this. Avoids an entire branch of filesystem calls above.
</span><span class="cx" style="display: block; padding: 0 10px">                        if ( isset( $theme_root_template ) ) {
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -762,6 +780,7 @@
</span><span class="cx" style="display: block; padding: 0 10px">                $this->errors            = null;
</span><span class="cx" style="display: block; padding: 0 10px">                $this->headers_sanitized = null;
</span><span class="cx" style="display: block; padding: 0 10px">                $this->name_translated   = null;
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                $this->block_theme       = null;
</ins><span class="cx" style="display: block; padding: 0 10px">                 $this->headers           = array();
</span><span class="cx" style="display: block; padding: 0 10px">                $this->__construct( $this->stylesheet, $this->theme_root );
</span><span class="cx" style="display: block; padding: 0 10px">        }
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -1491,18 +1510,25 @@
</span><span class="cx" style="display: block; padding: 0 10px">         * @return bool
</span><span class="cx" style="display: block; padding: 0 10px">         */
</span><span class="cx" style="display: block; padding: 0 10px">        public function is_block_theme() {
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                if ( isset( $this->block_theme ) ) {
+                       return $this->block_theme;
+               }
+
</ins><span class="cx" style="display: block; padding: 0 10px">                 $paths_to_index_block_template = array(
</span><span class="cx" style="display: block; padding: 0 10px">                        $this->get_file_path( '/block-templates/index.html' ),
</span><span class="cx" style="display: block; padding: 0 10px">                        $this->get_file_path( '/templates/index.html' ),
</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->block_theme = false;
+
</ins><span class="cx" style="display: block; padding: 0 10px">                 foreach ( $paths_to_index_block_template as $path_to_index_block_template ) {
</span><span class="cx" style="display: block; padding: 0 10px">                        if ( is_file( $path_to_index_block_template ) && is_readable( $path_to_index_block_template ) ) {
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                                return true;
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                         $this->block_theme = true;
+                               break;
</ins><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><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                return false;
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+         return $this->block_theme;
</ins><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></span></pre></div>
<a id="trunktestsphpunitteststhemewpThemephp"></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/wpTheme.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/tests/phpunit/tests/theme/wpTheme.php       2023-02-06 19:41:25 UTC (rev 55235)
+++ trunk/tests/phpunit/tests/theme/wpTheme.php 2023-02-06 19:57:41 UTC (rev 55236)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -276,6 +276,63 @@
</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">+         * @ticket 57114
+        *
+        * @covers WP_Theme::is_block_theme
+        *
+        * @dataProvider data_is_block_theme
+        */
+       public function test_is_block_theme_property( $theme_dir, $expected ) {
+               $theme = new WP_Theme( $theme_dir, $this->theme_root );
+               $theme->is_block_theme();
+               $reflection          = new ReflectionClass( $theme );
+               $reflection_property = $reflection->getProperty( 'block_theme' );
+               $reflection_property->setAccessible( true );
+
+               $this->assertSame( $expected, $reflection_property->getValue( $theme ) );
+       }
+
+       /**
+        * @ticket 57114
+        *
+        * @covers WP_Theme::is_block_theme
+        * @covers WP_Theme::cache_get
+        */
+       public function test_is_block_theme_check_cache() {
+               $filter = new MockAction();
+               add_filter( 'theme_file_path', array( $filter, 'filter' ) );
+
+               $theme1 = new WP_Theme( 'block-theme', $this->theme_root );
+               // First run.
+               $this->assertTrue( $theme1->is_block_theme(), 'is_block_theme should return true on first run' );
+
+               $theme2 = new WP_Theme( 'block-theme', $this->theme_root );
+               // Second run.
+               $this->assertTrue( $theme2->is_block_theme(), 'is_block_theme should return true on second run' );
+               $this->assertCount( 0, $filter->get_events(), 'Should only be 0, as second run should be cached' );
+       }
+
+       /**
+        * @ticket 57114
+        *
+        * @covers WP_Theme::is_block_theme
+        * @covers WP_Theme::cache_delete
+        */
+       public function test_is_block_theme_delete_cache() {
+               $filter = new MockAction();
+               add_filter( 'theme_file_path', array( $filter, 'filter' ) );
+
+               $theme = new WP_Theme( 'block-theme', $this->theme_root );
+               // First run.
+               $this->assertTrue( $theme->is_block_theme(), 'is_block_theme should return true on first run' );
+               // Clear cache.
+               $theme->cache_delete();
+               // Second run.
+               $this->assertTrue( $theme->is_block_theme(), 'is_block_theme should return true on second run' );
+               $this->assertCount( 2, $filter->get_events(), 'Should only be 4, as second run should not be cached' );
+       }
+
+       /**
</ins><span class="cx" style="display: block; padding: 0 10px">          * Test get_files for an existing theme.
</span><span class="cx" style="display: block; padding: 0 10px">         *
</span><span class="cx" style="display: block; padding: 0 10px">         * @ticket 53599
</span></span></pre>
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