Editor: Add selectors field to block type definition

Adds support for the new selectors property for block types. It adds it to the allowed metadata when registering a block type, makes the WP_Block_Type class aware of it, exposes it through the block types REST API, and the get_block_editor_server_block_settings function.

Corresponding work in the Gutenberg plugin: https://github.com/WordPress/gutenberg/pull/46496.

Fixes #57585.
Props aaronrobertshaw, hellofromTonya.



git-svn-id: https://develop.svn.wordpress.org/trunk@55673 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/blocks.php

@@ -300,6 +300,7 @@ function get_block_metadata_i18n_schema() {
  * @since 5.7.0 Added support for `textdomain` field and i18n handling for all translatable fields.
  * @since 5.9.0 Added support for `variations` and `viewScript` fields.
  * @since 6.1.0 Added support for `render` field.
+ * @since 6.3.0 Added `selectors` field.
  *
  * @param string $file_or_folder Path to the JSON file with metadata definition for
  *                               the block or path to the folder where the `block.json` file is located.
@@ -382,6 +383,7 @@ function register_block_type_from_metadata( $file_or_folder, $args = array() ) {
 		'attributes'      => 'attributes',
 		'providesContext' => 'provides_context',
 		'usesContext'     => 'uses_context',
+		'selectors'       => 'selectors',
 		'supports'        => 'supports',
 		'styles'          => 'styles',
 		'variations'      => 'variations',

src/wp-includes/class-wp-block-type.php

@@ -117,6 +117,14 @@ class WP_Block_Type {
 	 */
 	public $variations = array();
 
+	/**
+	 * Custom CSS selectors for theme.json style generation.
+	 *
+	 * @since 6.3.0
+	 * @var array
+	 */
+	public $selectors = array();
+
 	/**
 	 * Supported features.
 	 *
@@ -245,6 +253,7 @@ class WP_Block_Type {
 	 * @since 6.1.0 Added the `editor_script_handles`, `script_handles`, `view_script_handles,
 	 *              `editor_style_handles`, and `style_handles` properties.
 	 *              Deprecated the `editor_script`, `script`, `view_script`, `editor_style`, and `style` properties.
+	 * @since 6.3.0 Added the `selectors` property.
 	 *
 	 * @see register_block_type()
 	 *
@@ -268,6 +277,7 @@ class WP_Block_Type {
 	 *     @type string|null   $textdomain               The translation textdomain.
 	 *     @type array[]       $styles                   Alternative block styles.
 	 *     @type array[]       $variations               Block variations.
+	 *     @type array         $selectors                Custom CSS selectors for theme.json style generation.
 	 *     @type array|null    $supports                 Supported features.
 	 *     @type array|null    $example                  Structured data for the block preview.
 	 *     @type callable|null $render_callback          Block type render callback.

src/wp-includes/rest-api/endpoints/class-wp-rest-block-types-controller.php

@@ -237,6 +237,7 @@ class WP_REST_Block_Types_Controller extends WP_REST_Controller {
 	 *
 	 * @since 5.5.0
 	 * @since 5.9.0 Renamed `$block_type` to `$item` to match parent class for PHP 8 named parameter support.
+	 * @since 6.3.0 Added `selectors` field.
 	 *
 	 * @param WP_Block_Type   $item    Block type data.
 	 * @param WP_REST_Request $request Full details about the request.
@@ -278,6 +279,7 @@ class WP_REST_Block_Types_Controller extends WP_REST_Controller {
 				'ancestor',
 				'provides_context',
 				'uses_context',
+				'selectors',
 				'supports',
 				'styles',
 				'textdomain',
@@ -379,6 +381,7 @@ class WP_REST_Block_Types_Controller extends WP_REST_Controller {
 	 * Retrieves the block type' schema, conforming to JSON Schema.
 	 *
 	 * @since 5.5.0
+	 * @since 6.3.0 Added `selectors` field.
 	 *
 	 * @return array Item schema data.
 	 */
@@ -518,6 +521,14 @@ class WP_REST_Block_Types_Controller extends WP_REST_Controller {
 					'context'     => array( 'embed', 'view', 'edit' ),
 					'readonly'    => true,
 				),
+				'selectors'             => array(
+					'description' => __( 'Custom CSS selectors.' ),
+					'type'        => 'object',
+					'default'     => array(),
+					'properties'  => array(),
+					'context'     => array( 'embed', 'view', 'edit' ),
+					'readonly'    => true,
+				),
 				'supports'              => array(
 					'description' => __( 'Block supports.' ),
 					'type'        => 'object',