Blocks: Add context fields to WP_Block_Type

New block context related fields were added as part of WordPress/gutenberg#22686. This changest backports them to WP_Block_Type class.

Props aduth, spacedmonkey, mcsf, epiqueras.
Fixes #47656.  


Built from https://develop.svn.wordpress.org/trunk@48117


git-svn-id: http://core.svn.wordpress.org/trunk@47886 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/includes/post.php

@@ -2234,19 +2234,33 @@ function get_block_categories( $post ) {
 function get_block_editor_server_block_settings() {
 	$block_registry = WP_Block_Type_Registry::get_instance();
 	$blocks         = array();
-	$keys_to_pick   = array( 'title', 'description', 'icon', 'category', 'keywords', 'parent', 'supports', 'attributes', 'styles', 'textdomain', 'example' );
+	$fields_to_pick   = array(
+		'title'            => 'title',
+		'description'      => 'description',
+		'icon'             => 'icon',
+		'category'         => 'category',
+		'keywords'         => 'keywords',
+		'parent'           => 'parent',
+		'supports'         => 'supports',
+		'attributes'       => 'attributes',
+		'provides_context' => 'providesContext',
+		'uses_context'     => 'usesContext',
+		'styles'           => 'styles',
+		'textdomain'       => 'textdomain',
+		'example'          => 'example',
+	);
 
 	foreach ( $block_registry->get_all_registered() as $block_name => $block_type ) {
-		foreach ( $keys_to_pick as $key ) {
-			if ( ! isset( $block_type->{ $key } ) ) {
+		foreach ( $fields_to_pick as $field => $key ) {
+			if ( ! isset( $block_type->{ $field } ) ) {
 				continue;
 			}
 
 			if ( ! isset( $blocks[ $block_name ] ) ) {
 				$blocks[ $block_name ] = array();
 			}
 
-			$blocks[ $block_name ][ $key ] = $block_type->{ $key };
+			$blocks[ $block_name ][ $key ] = $block_type->{ $field };
 		}
 	}
 

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

@@ -74,9 +74,9 @@ class WP_Block_Type {
 
 	/**
 	 * @since 5.5.0
-	 * @var array
+	 * @var array|null
 	 */
-	public $supports = array();
+	public $supports = null;
 
 	/**
 	 * @since 5.5.0
@@ -100,6 +100,22 @@ class WP_Block_Type {
 	 */
 	public $attributes = null;
 
+	/**
+	 * Context values inherited by blocks of this type.
+	 *
+	 * @since 5.5.0
+	 * @var array
+	 */
+	public $uses_context = array();
+
+	/**
+	 * Context provided by blocks of this type.
+	 *
+	 * @since 5.5.0
+	 * @var array|null
+	 */
+	public $provides_context = null;
+
 	/**
 	 * Block type editor script handle.
 	 *

wp-includes/version.php

@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.5-alpha-48116';
+$wp_version = '5.5-alpha-48117';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.