Blocks: Allow arrays for deprecated asset types in block registration.

In `register_block_type`, continue to allow passing arrays as the `editor_script`, `script`, `view_script`, `editor_style`, and `style` arguments. Note that those fields were soft-deprecated in favor of their `_handles` counterparts in [54155], which would allow specifying multiple items. At the same time, the deprecated fields were limited to `string` or `null`.

However, this broke existing code that passed an array as one of those arguments. For backwards compatibility, this change thus restores the previous behavior. It is implemented in `WP_Block_Type` as a pair of `__get()` and `__set()` methods that wrap around the corresponding `_handles` members, which are arrays of strings.

It also affects the REST API endpoint for block types. The latter’s schema has never allowed for anything other than `string` or `null` for any of those fields. For this reason, it now returns the first element of the array stored in the corresponding `_handles` member in `WP_Block_Type`.

Follow-up [54155].
Props nendeb55, costdev, gziolo, spacedmonkey, mukesh27, sergeybiryukov, audrasjb.
Fixes #56707.
Built from https://develop.svn.wordpress.org/trunk@54670


git-svn-id: http://core.svn.wordpress.org/trunk@54222 1a063a9b-81f0-0310-95a4-ce76da25c4cd

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

@@ -295,8 +295,8 @@ class WP_Block_Type {
 	 *
 	 * @param string $name Deprecated property name.
 	 *
-	 * @return string|null|void The value read from the new property if the first item in the array provided,
+	 * @return string|string[]|null|void The value read from the new property if the first item in the array provided,
-	 *                          null when value not found, or void when unknown property name provided.
+	 *                                   null when value not found, or void when unknown property name provided.
 	 */
 	public function __get( $name ) {
 		if ( ! in_array( $name, $this->deprecated_properties ) ) {
@@ -304,6 +304,14 @@ class WP_Block_Type {
 		}
 
 		$new_name = $name . '_handles';
+
+		if ( ! property_exists( $this, $new_name ) || ! is_array( $this->{$new_name} ) ) {
+			return null;
+		}
+
+		if ( count( $this->{$new_name} ) > 1 ) {
+			return $this->{$new_name};
+		}
 		return isset( $this->{$new_name}[0] ) ? $this->{$new_name}[0] : null;
 	}
 
@@ -343,12 +351,32 @@ class WP_Block_Type {
 			return;
 		}
 
+		$new_name = $name . '_handles';
+
+		if ( is_array( $value ) ) {
+			$filtered = array_filter( $value, 'is_string' );
+
+			if ( count( $filtered ) !== count( $value ) ) {
+					_doing_it_wrong(
+						__METHOD__,
+						sprintf(
+							/* translators: %s: The '$value' argument. */
+							__( 'The %s argument must be a string or a string array.' ),
+							'<code>$value</code>'
+						),
+						'6.1.0'
+					);
+			}
+
+			$this->{$new_name} = array_values( $filtered );
+			return;
+		}
+
 		if ( ! is_string( $value ) ) {
 			return;
 		}
 
-		$new_name             = $name . '_handles';
+		$this->{$new_name} = array( $value );
-		$this->{$new_name}[0] = $value;
 	}
 
 	/**

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

@@ -295,6 +295,10 @@ class WP_REST_Block_Types_Controller extends WP_REST_Controller {
 			if ( rest_is_field_included( $extra_field, $fields ) ) {
 				if ( isset( $block_type->$extra_field ) ) {
 					$field = $block_type->$extra_field;
+					if ( in_array( $extra_field, $deprecated_fields, true ) && is_array( $field ) ) {
+						// Since the schema only allows strings or null (but no arrays), we return the first array item.
+						$field = ! empty( $field ) ? array_shift( $field ) : '';
+					}
 				} elseif ( array_key_exists( 'default', $schema['properties'][ $extra_field ] ) ) {
 					$field = $schema['properties'][ $extra_field ]['default'];
 				} else {

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.2-alpha-54669';
+$wp_version = '6.2-alpha-54670';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.