SpecialMyLanguage.php

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<?php
use MediaWiki\Languages\LanguageNameUtils;
use MediaWiki\Page\RedirectLookup;
 
class SpecialMyLanguage extends RedirectSpecialArticle {
 
    private $languageNameUtils;
 
    private $redirectLookup;
 
    public function __construct(
        LanguageNameUtils $languageNameUtils,
        RedirectLookup $redirectLookup
    ) {
        parent::__construct( 'MyLanguage' );
        $this->languageNameUtils = $languageNameUtils;
        $this->redirectLookup = $redirectLookup;
    }
 
    public function getRedirect( $subpage ) {
        $title = $this->findTitle( $subpage );
        // Go to the main page if given invalid title.
        if ( !$title ) {
            $title = Title::newMainPage();
        }
        return $title;
    }
 
    public function findTitle( $subpage ) {
        return $this->findTitleInternal( $subpage, false );
    }
 
    public function findTitleForTransclusion( $subpage ) {
        return $this->findTitleInternal( $subpage, true );
    }
 
    private function findTitleInternal( $subpage, $forTransclusion ) {
        // base = title without language code suffix
        // provided = the title as it was given
        $base = $provided = null;
        if ( $subpage !== null ) {
            $provided = Title::newFromText( $subpage );
            $base = $provided;
 
            if ( $provided && strpos( $subpage, '/' ) !== false ) {
                $pos = strrpos( $subpage, '/' );
                $basepage = substr( $subpage, 0, $pos );
                $code = substr( $subpage, $pos + 1 );
                if ( strlen( $code ) && $this->languageNameUtils->isKnownLanguageTag( $code ) ) {
                    $base = Title::newFromText( $basepage );
                }
            }
        }
 
        if ( !$base || !$base->canExist() ) {
            // No subpage provided or base page does not exist
            return null;
        }
 
        if ( $base->isRedirect() ) {
            $base = $this->redirectLookup->getRedirectTarget( $base );
        }
 
        $uiLang = $this->getLanguage();
        $contLang = $this->getContentLanguage();
 
        if ( $uiLang->equals( $contLang ) && !$forTransclusion ) {
            // Short circuit when the current UI language is the
            // wiki's default language to avoid unnecessary page lookups.
            return $base;
        }
 
        // Check for a subpage in current UI language
        $proposed = $base->getSubpage( $uiLang->getCode() );
        if ( $proposed && $proposed->exists() ) {
            return $proposed;
        }
 
        if ( $provided !== $base && $provided->exists() ) {
            // Explicit language code given and the page exists
            return $provided;
        }
 
        // Check for fallback languages specified by the UI language
        $possibilities = $uiLang->getFallbackLanguages();
        foreach ( $possibilities as $lang ) {
            if ( $forTransclusion || $lang !== $contLang->getCode() ) {
                $proposed = $base->getSubpage( $lang );
                if ( $proposed && $proposed->exists() ) {
                    return $proposed;
                }
            }
        }
 
        // When all else has failed, return the base page
        return $base;
    }
 
    public function personallyIdentifiableTarget() {
        return true;
    }
}