SpecialMyLanguage.php

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<?php
class SpecialMyLanguage extends RedirectSpecialArticle {
    public function __construct() {
        parent::__construct( 'MyLanguage' );
    }
 
    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 ) {
        // 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 ) && Language::isKnownLanguageTag( $code ) ) {
                $base = Title::newFromText( $basepage );
            }
        }
 
        if ( !$base ) {
            return null;
        }
 
        if ( $base->isRedirect() ) {
            $page = new WikiPage( $base );
            $base = $page->getRedirectTarget();
        }
 
        $uiCode = $this->getLanguage()->getCode();
        $proposed = $base->getSubpage( $uiCode );
        if ( $proposed && $proposed->exists() && $uiCode !== $base->getPageLanguage()->getCode() ) {
            return $proposed;
        } elseif ( $provided && $provided->exists() ) {
            return $provided;
        } else {
            return $base;
        }
    }
 
    public function personallyIdentifiableTarget() {
        return true;
    }
}