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<title>[54251] trunk/src: Editor: Backport hooks to filter `theme.json` data from Gutenberg to 6.1.</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/54251">54251</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/54251","name":"Review Commit"}}</script></dd>
<dt style="float: left; width: 6em; font-weight: bold">Author</dt> <dd>audrasjb</dd>
<dt style="float: left; width: 6em; font-weight: bold">Date</dt> <dd>2022-09-20 13:10:28 +0000 (Tue, 20 Sep 2022)</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'>Editor: Backport hooks to filter `theme.json` data from Gutenberg to 6.1.

This changeset ports the work done in Gutenberg (released in 14.1) to add hooks to filter the `theme.json` data. Specifically, it adds the following filters: `theme_json_default`, `theme_json_blocks`, `theme_json_theme`, and `theme_json_user`.

For more details, see the following Gutenberg pull requests:

- [https://github.com/WordPress/gutenberg/pull/44015 gutenberg<a href="https://core.trac.wordpress.org/ticket/44015">#44015</a>]: Make global styles data filterable
- [https://github.com/WordPress/gutenberg/pull/44109 gutenberg<a href="https://core.trac.wordpress.org/ticket/44109">#44109</a>]: Prepare `WP_Theme_JSON_Data` class for backporting
- [https://github.com/WordPress/gutenberg/pull/44159 gutenberg<a href="https://core.trac.wordpress.org/ticket/44159">#44159</a>]: Update hook's names from `global_styles_*` to `theme_json_*`

Props oandregal, czapla, gziolo, bernhard-reiter.
See <a href="https://core.trac.wordpress.org/ticket/56467">#56467</a>.</pre>

<h3>Modified Paths</h3>
<ul>
<li><a href="#trunksrcwpincludesclasswpthemejsonresolverphp">trunk/src/wp-includes/class-wp-theme-json-resolver.php</a></li>
<li><a href="#trunksrcwpsettingsphp">trunk/src/wp-settings.php</a></li>
</ul>

<h3>Added Paths</h3>
<ul>
<li><a href="#trunksrcwpincludesclasswpthemejsondataphp">trunk/src/wp-includes/class-wp-theme-json-data.php</a></li>
</ul>

</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunksrcwpincludesclasswpthemejsondataphp"></a>
<div class="addfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Added: trunk/src/wp-includes/class-wp-theme-json-data.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-data.php                                (rev 0)
+++ trunk/src/wp-includes/class-wp-theme-json-data.php  2022-09-20 13:10:28 UTC (rev 54251)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -0,0 +1,72 @@
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+<?php
+/**
+ * WP_Theme_JSON_Data class
+ *
+ * @package WordPress
+ * @subpackage Theme
+ * @since 6.1.0
+ */
+
+/**
+ * Class to provide access to update a theme.json structure.
+ */
+class WP_Theme_JSON_Data {
+
+       /**
+        * Container of the data to update.
+        *
+        * @since 6.1.0
+        * @var WP_Theme_JSON
+        */
+       private $theme_json = null;
+
+       /**
+        * The origin of the data: default, theme, user, etc.
+        *
+        * @since 6.1.0
+        * @var string
+        */
+       private $origin = '';
+
+       /**
+        * Constructor.
+        *
+        * @since 6.1.0
+        *
+        * @link https://developer.wordpress.org/block-editor/reference-guides/theme-json-reference/
+        *
+        * @param array  $data   Array following the theme.json specification.
+        * @param string $origin The origin of the data: default, theme, user.
+        */
+       public function __construct( $data = array(), $origin = 'theme' ) {
+               $this->origin     = $origin;
+               $this->theme_json = new WP_Theme_JSON( $data, $this->origin );
+       }
+
+       /**
+        * Updates the theme.json with the the given data.
+        *
+        * @since 6.1.0
+        *
+        * @param array $new_data Array following the theme.json specification.
+        *
+        * @return WP_Theme_JSON_Data The own instance with access to the modified data.
+        */
+       public function update_with( $new_data ) {
+               $this->theme_json->merge( new WP_Theme_JSON( $new_data, $this->origin ) );
+               return $this;
+       }
+
+       /**
+        * Returns an array containing the underlying data
+        * following the theme.json specification.
+        *
+        * @since 6.1.0
+        *
+        * @return array
+        */
+       public function get_data() {
+               return $this->theme_json->get_raw_data();
+       }
+
+}
</ins><span class="cx" style="display: block; padding: 0 10px">Property changes on: trunk/src/wp-includes/class-wp-theme-json-data.php
</span><span class="cx" style="display: block; padding: 0 10px">___________________________________________________________________
</span></span></pre></div>
<a id="svneolstyle"></a>
<div class="addfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Added: svn:eol-style</h4></div>
<ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+native
</ins><span class="cx" style="display: block; padding: 0 10px">\ No newline at end of property
</span><a id="trunksrcwpincludesclasswpthemejsonresolverphp"></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-resolver.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-resolver.php    2022-09-20 13:10:24 UTC (rev 54250)
+++ trunk/src/wp-includes/class-wp-theme-json-resolver.php      2022-09-20 13:10:28 UTC (rev 54251)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -137,6 +137,15 @@
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">                $config       = static::read_json_file( __DIR__ . '/theme.json' );
</span><span class="cx" style="display: block; padding: 0 10px">                $config       = static::translate( $config );
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                /**
+                * Filters the default data provided by WordPress for global styles & settings.
+                *
+                * @since 6.1.0
+                *
+                * @param WP_Theme_JSON_Data Class to access and update the underlying data.
+                */
+               $theme_json   = apply_filters( 'theme_json_default', new WP_Theme_JSON_Data( $config, 'default' ) );
+               $config       = $theme_json->get_data();
</ins><span class="cx" style="display: block; padding: 0 10px">                 static::$core = new WP_Theme_JSON( $config, 'default' );
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">                return static::$core;
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -172,6 +181,15 @@
</span><span class="cx" style="display: block; padding: 0 10px">                if ( null === static::$theme ) {
</span><span class="cx" style="display: block; padding: 0 10px">                        $theme_json_data = static::read_json_file( static::get_file_path_from_theme( 'theme.json' ) );
</span><span class="cx" style="display: block; padding: 0 10px">                        $theme_json_data = static::translate( $theme_json_data, wp_get_theme()->get( 'TextDomain' ) );
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                        /**
+                        * Filters the data provided by the theme for global styles & settings.
+                        *
+                        * @since 6.1.0
+                        *
+                        * @param WP_Theme_JSON_Data Class to access and update the underlying data.
+                        */
+                       $theme_json      = apply_filters( 'theme_json_theme', new WP_Theme_JSON_Data( $theme_json_data, 'theme' ) );
+                       $theme_json_data = $theme_json->get_data();
</ins><span class="cx" style="display: block; padding: 0 10px">                         static::$theme   = new WP_Theme_JSON( $theme_json_data );
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">                        if ( wp_get_theme()->parent() ) {
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -258,6 +276,16 @@
</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">+                /**
+                * Filters the data provided by the blocks for global styles & settings.
+                *
+                * @since 6.1.0
+                *
+                * @param WP_Theme_JSON_Data Class to access and update the underlying data.
+                */
+               $theme_json = apply_filters( 'theme_json_blocks', new WP_Theme_JSON_Data( $config, 'core' ) );
+               $config     = $theme_json->get_data();
+
</ins><span class="cx" style="display: block; padding: 0 10px">                 // Core here means it's the lower level part of the styles chain.
</span><span class="cx" style="display: block; padding: 0 10px">                // It can be a core or a third-party block.
</span><span class="cx" style="display: block; padding: 0 10px">                return new WP_Theme_JSON( $config, 'core' );
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -382,6 +410,15 @@
</span><span class="cx" style="display: block; padding: 0 10px">                        $json_decoding_error = json_last_error();
</span><span class="cx" style="display: block; padding: 0 10px">                        if ( JSON_ERROR_NONE !== $json_decoding_error ) {
</span><span class="cx" style="display: block; padding: 0 10px">                                trigger_error( 'Error when decoding a theme.json schema for user data. ' . json_last_error_msg() );
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                                /**
+                                * Filters the data provided by the user for global styles & settings.
+                                *
+                                * @since 6.1.0
+                                *
+                                * @param WP_Theme_JSON_Data Class to access and update the underlying data.
+                                */
+                               $theme_json = apply_filters( 'theme_json_user', new WP_Theme_JSON_Data( $config, 'custom' ) );
+                               $config     = $theme_json->get_data();
</ins><span class="cx" style="display: block; padding: 0 10px">                                 return new WP_Theme_JSON( $config, 'custom' );
</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">@@ -396,6 +433,16 @@
</span><span class="cx" style="display: block; padding: 0 10px">                                $config = $decoded_data;
</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">+
+               /**
+                * Filters the data provided by the user for global styles & settings.
+                *
+                * @since 6.1.0
+                *
+                * @param WP_Theme_JSON_Data Class to access and update the underlying data.
+                */
+               $theme_json   = apply_filters( 'theme_json_user', new WP_Theme_JSON_Data( $config, 'custom' ) );
+               $config       = $theme_json->get_data();
</ins><span class="cx" style="display: block; padding: 0 10px">                 static::$user = new WP_Theme_JSON( $config, 'custom' );
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">                return static::$user;
</span></span></pre></div>
<a id="trunksrcwpsettingsphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/src/wp-settings.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-settings.php 2022-09-20 13:10:24 UTC (rev 54250)
+++ trunk/src/wp-settings.php   2022-09-20 13:10:28 UTC (rev 54251)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -172,6 +172,7 @@
</span><span class="cx" style="display: block; padding: 0 10px"> require ABSPATH . WPINC . '/theme.php';
</span><span class="cx" style="display: block; padding: 0 10px"> require ABSPATH . WPINC . '/class-wp-theme.php';
</span><span class="cx" style="display: block; padding: 0 10px"> require ABSPATH . WPINC . '/class-wp-theme-json-schema.php';
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+require ABSPATH . WPINC . '/class-wp-theme-json-data.php';
</ins><span class="cx" style="display: block; padding: 0 10px"> require ABSPATH . WPINC . '/class-wp-theme-json.php';
</span><span class="cx" style="display: block; padding: 0 10px"> require ABSPATH . WPINC . '/class-wp-theme-json-resolver.php';
</span><span class="cx" style="display: block; padding: 0 10px"> require ABSPATH . WPINC . '/global-styles-and-settings.php';
</span></span></pre>
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