NaiveForeignTitleFactory.php

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<?php
class NaiveForeignTitleFactory implements ForeignTitleFactory {
 
    private $contentLanguage;
 
    public function __construct( Language $contentLanguage ) {
        $this->contentLanguage = $contentLanguage;
    }
 
    public function createForeignTitle( $title, $ns = null ) {
        $pieces = explode( ':', $title, 2 );
 
        $isNamespacePartValid = $ns === null
            ? $this->contentLanguage->getNsIndex( $pieces[0] ) !== false
            : $ns != 0;
 
        if ( count( $pieces ) === 2 && $isNamespacePartValid ) {
            [ $namespaceName, $pageName ] = $pieces;
        } else {
            $namespaceName = '';
            $pageName = $title;
        }
 
        return new ForeignTitle( $ns, $namespaceName, $pageName );
    }
}