MainSlotRoleHandler.php

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<?php
namespace MediaWiki\Revision;

use ContentHandler;
use Hooks;
use MediaWiki\Linker\LinkTarget;
use Title;

class MainSlotRoleHandler extends SlotRoleHandler {

    private $namespaceContentModels;

    public function __construct( array $namespaceContentModels ) {
        parent::__construct( 'main', CONTENT_MODEL_WIKITEXT );
        $this->namespaceContentModels = $namespaceContentModels;
    }

    public function supportsArticleCount() {
        return true;
    }

    public function isAllowedModel( $model, LinkTarget $page ) {
        $title = Title::newFromLinkTarget( $page );
        $handler = ContentHandler::getForModelID( $model );
        return $handler->canBeUsedOn( $title );
    }

    public function getDefaultModel( LinkTarget $page ) {
        // NOTE: this method must not rely on $title->getContentModel() directly or indirectly,
        //       because it is used to initialize the mContentModel member.

        $ext = '';
        $ns = $page->getNamespace();
        $model = $this->namespaceContentModels[$ns] ?? null;

        // Hook can determine default model
        $title = Title::newFromLinkTarget( $page );
        if ( !Hooks::run( 'ContentHandlerDefaultModelFor', [ $title, &$model ] ) && !is_null( $model ) ) {
            return $model;
        }

        // Could this page contain code based on the title?
        $isCodePage = $ns === NS_MEDIAWIKI && preg_match( '!\.(css|js|json)$!u', $title->getText(), $m );
        if ( $isCodePage ) {
            $ext = $m[1];
        }

        // Is this a user subpage containing code?
        $isCodeSubpage = $ns === NS_USER
            && !$isCodePage
            && preg_match( "/\\/.*\\.(js|css|json)$/", $title->getText(), $m );

        if ( $isCodeSubpage ) {
            $ext = $m[1];
        }

        // Is this wikitext, according to $wgNamespaceContentModels or the DefaultModelFor hook?
        $isWikitext = is_null( $model ) || $model == CONTENT_MODEL_WIKITEXT;
        $isWikitext = $isWikitext && !$isCodePage && !$isCodeSubpage;

        if ( !$isWikitext ) {
            switch ( $ext ) {
                case 'js':
                    return CONTENT_MODEL_JAVASCRIPT;
                case 'css':
                    return CONTENT_MODEL_CSS;
                case 'json':
                    return CONTENT_MODEL_JSON;
                default:
                    return $model ?? CONTENT_MODEL_TEXT;
            }
        }

        // We established that it must be wikitext

        return CONTENT_MODEL_WIKITEXT;
    }

}