NaiveImportTitleFactory.php

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<?php
class NaiveImportTitleFactory implements ImportTitleFactory {
    public function createTitleFromForeignTitle( ForeignTitle $foreignTitle ) {
        global $wgContLang;

        if ( $foreignTitle->isNamespaceIdKnown() ) {
            $foreignNs = $foreignTitle->getNamespaceId();

            // For built-in namespaces (0 <= ID < 100), we try to find a local NS with
            // the same namespace ID
            if ( $foreignNs < 100 && MWNamespace::exists( $foreignNs ) ) {
                return Title::makeTitleSafe( $foreignNs, $foreignTitle->getText() );
            }
        }

        // Do we have a local namespace by the same name as the foreign
        // namespace?
        $targetNs = $wgContLang->getNsIndex( $foreignTitle->getNamespaceName() );
        if ( $targetNs !== false ) {
            return Title::makeTitleSafe( $targetNs, $foreignTitle->getText() );
        }

        // Otherwise, just fall back to main namespace
        return Title::makeTitleSafe( 0, $foreignTitle->getFullText() );
    }
}