Parsing Svpply referrer links

svpply.js

var svpply = function(referrer){
  var params = {};
  if(referrer.substring(0, 17) === 'http://svpply.com'){
    var e,
        a = /\+/g,
        r = /([^&=]+)=?([^&]*)/g,
        d = function(s){ return decodeURIComponent(s.replace(a, " ")); },
        q = referrer.split('?')[1];

    while (e = r.exec(q))
       params[d(e[1])] = d(e[2]) === 'true' ? true : d(e[2]) === 'false' ? false : d(e[2]);

    delete params.redirect;
  }
  return params;
};

var svpply_user_info = svpply(document.referrer);

svpply.rb

require 'cgi'
def svpply(referrer)
  params = {}
  if referrer[0..16] == 'http://svpply.com'
    CGI::parse(referrer.split('?')[1]).each do |key, val|
      params[key] = (val[0] === 'true' ? true : val[0] === 'false' ? false : val[0]) unless key == "redirect"
    end
  end
  params
end

svpply_user_info = svpply(request.referer)