SpecialDiff.php

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<?php
class SpecialDiff extends RedirectSpecialPage {
    function __construct() {
        parent::__construct( 'Diff' );
        $this->mAllowedRedirectParams = array();
    }

    function getRedirect( $subpage ) {
        $parts = explode( '/', $subpage );

        // Try to parse the values given, generating somewhat pretty URLs if possible
        if ( count( $parts ) === 1 && $parts[0] !== '' ) {
            $this->mAddedRedirectParams['diff'] = $parts[0];
        } elseif ( count( $parts ) === 2 ) {
            $this->mAddedRedirectParams['oldid'] = $parts[0];
            $this->mAddedRedirectParams['diff'] = $parts[1];
        } else {
            // Wrong number of parameters, bail out
            throw new ErrorPageError( 'nopagetitle', 'nopagetext' );
        }

        return true;
    }
}