NaiveImportTitleFactory.php

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<?php
class NaiveImportTitleFactory implements ImportTitleFactory {
    private $contentLanguage;
 
    private $namespaceInfo;
 
    private $titleFactory;
 
    public function __construct(
        Language $contentLanguage,
        NamespaceInfo $namespaceInfo,
        TitleFactory $titleFactory
    ) {
        $this->contentLanguage = $contentLanguage;
        $this->namespaceInfo = $namespaceInfo;
        $this->titleFactory = $titleFactory;
    }
 
    public function createTitleFromForeignTitle( ForeignTitle $foreignTitle ) {
        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 &&
                $this->namespaceInfo->exists( $foreignNs )
            ) {
                return $this->titleFactory->makeTitleSafe( $foreignNs, $foreignTitle->getText() );
            }
        }
 
        // Do we have a local namespace by the same name as the foreign
        // namespace?
        $targetNs = $this->contentLanguage->getNsIndex( $foreignTitle->getNamespaceName() );
        if ( $targetNs !== false ) {
            return $this->titleFactory->makeTitleSafe( $targetNs, $foreignTitle->getText() );
        }
 
        // Otherwise, just fall back to main namespace
        return $this->titleFactory->makeTitleSafe( 0, $foreignTitle->getFullText() );
    }
}