[MCR] Introduce SlotRoleHandler and SlotRoleRegistry

These new classes provide a mechanism for defining the
behavior of slots, like the content models it supports.
This acts as an extension point for extensions that need
to define custom slots, like the MediaInfo extension
for the SDC project.

Bug: T194046
Change-Id: Ia20c98eee819293199e541be75b5521f6413bc2f

1 files changed, 7 insertions, 2 deletions

diff --git a/includes/MWNamespace.php b/includes/MWNamespace.php
index e03a29b80f08..98e70bf9f753 100644
--- a/includes/MWNamespace.php
+++ b/includes/MWNamespace.php
@@ -19,6 +19,7 @@
  *
  * @file
  */
+use MediaWiki\MediaWikiServices;
 
 /**
  * This is a utility class with only static functions
@@ -462,13 +463,17 @@ class MWNamespace {
 	 * Get the default content model for a namespace
 	 * This does not mean that all pages in that namespace have the model
 	 *
+	 * @note To determine the default model for a new page's main slot, or any slot in general,
+	 * use SlotRoleHandler::getDefaultModel() together with SlotRoleRegistry::getRoleHandler().
+	 *
 	 * @since 1.21
 	 * @param int $index Index to check
 	 * @return null|string Default model name for the given namespace, if set
 	 */
 	public static function getNamespaceContentModel( $index ) {
-		global $wgNamespaceContentModels;
-		return $wgNamespaceContentModels[$index] ?? null;
+		$config = MediaWikiServices::getInstance()->getMainConfig();
+		$models = $config->get( 'NamespaceContentModels' );
+		return $models[$index] ?? null;
 	}
 
 	/**