NamespaceAwareForeignTitleFactory.php

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<?php
class NamespaceAwareForeignTitleFactory implements ForeignTitleFactory {
    protected $foreignNamespaces;
    private $foreignNamespacesFlipped;

    private function normalizeNamespaceName( $name ) {
        return strtolower( str_replace( ' ', '_', $name ) );
    }

    public function __construct( $foreignNamespaces ) {
        $this->foreignNamespaces = $foreignNamespaces;
        if ( !is_null( $foreignNamespaces ) ) {
            $this->foreignNamespacesFlipped = [];
            foreach ( $foreignNamespaces as $id => $name ) {
                $newKey = self::normalizeNamespaceName( $name );
                $this->foreignNamespacesFlipped[$newKey] = $id;
            }
        }
    }

    public function createForeignTitle( $title, $ns = null ) {
        // Export schema version 0.5 and earlier (MW 1.18 and earlier) does not
        // contain a <ns> tag, so we need to be able to handle that case.
        if ( is_null( $ns ) ) {
            return self::parseTitleNoNs( $title );
        } else {
            return self::parseTitleWithNs( $title, $ns );
        }
    }

    protected function parseTitleNoNs( $title ) {
        $pieces = explode( ':', $title, 2 );
        $key = self::normalizeNamespaceName( $pieces[0] );

        // Does the part before the colon match a known namespace? Check the
        // foreign namespaces
        $isNamespacePartValid = isset( $this->foreignNamespacesFlipped[$key] );

        if ( count( $pieces ) === 2 && $isNamespacePartValid ) {
            list( $namespaceName, $pageName ) = $pieces;
            $ns = $this->foreignNamespacesFlipped[$key];
        } else {
            $namespaceName = '';
            $pageName = $title;
            $ns = 0;
        }

        return new ForeignTitle( $ns, $namespaceName, $pageName );
    }

    protected function parseTitleWithNs( $title, $ns ) {
        $pieces = explode( ':', $title, 2 );

        if ( isset( $this->foreignNamespaces[$ns] ) ) {
            $namespaceName = $this->foreignNamespaces[$ns];
        } else {
            $namespaceName = $ns == '0' ? '' : $pieces[0];
        }

        // We assume that the portion of the page title before the colon is the
        // namespace name, except in the case of namespace 0
        if ( $ns != '0' ) {
            $pageName = $pieces[1];
        } else {
            $pageName = $title;
        }

        return new ForeignTitle( $ns, $namespaceName, $pageName );
    }
}