/*
 * $Id: geckoGetRv.js,v 1.5 2003/09/14 21:22:26 bc Exp $
 *
 */

/* ***** BEGIN LICENSE BLOCK *****
 * The contents of this file are subject to the Mozilla Public License Version 
 * 1.1 (the "License"); you may not use this file except in compliance with 
 * the License. You may obtain a copy of the License at 
 * http://www.mozilla.org/MPL/
 * 
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 * 
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Netscape code.
 *
 * The Initial Developer of the Original Code is
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 * Portions created by the Initial Developer are Copyright (C) 2001
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s): Bob Clary <bclary@netscape.com>
 *
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 ***** END LICENSE BLOCK ***** */

// return the rv value of a Gecko user agent
// as a floating point number. 
// returns -1 for non-gecko browsers, 
//          0 for pre Netscape 6.1/Gecko 0.9.1 browsers
//          number > 0 where each portion of 
//          the rv value delimited by . 
//          will be treated as value out of 100.
//          e.g. for rv: 3.12.42, 
//          getGeckoRv() returns 3.1242
//          
function geckoGetRv()
{
  if (navigator.product != 'Gecko')
  {
    return -1;
  }
  var rvValue = 0;
  var ua      = navigator.userAgent.toLowerCase();
  var rvStart = ua.indexOf('rv:');
  var rvEnd   = ua.indexOf(')', rvStart);
  var rv      = ua.substring(rvStart+3, rvEnd);
  var rvParts = rv.split('.');
  var exp     = 1;

  for (var i = 0; i < rvParts.length; i++)
  {
    var val = parseInt(rvParts[i]);
    rvValue += val / exp;
    exp *= 100;
  }

  return rvValue;
}