Params.js - A simple, flexible parameter module

params.js

var params = function(w) {
  var win = w || window;
  var baseQstring = (win.location.search) ? win.location.search : (win.location.hash.split('?')[1] || '');
  var qstring = decodeURIComponent(baseQstring.replace('?',''));
  var keyval_groups = qstring.split(/[\?&]/);
  var p = {};
  for (var i in keyval_groups) {
    var first_equal = keyval_groups[i].indexOf('=')
    var key = keyval_groups[i].slice(0, first_equal);
    var value = keyval_groups[i].slice(first_equal+1);
    // convert "true" and "false" to boolean
    if (value === "true") {
      value = true;
    }
    else if (value === "false") {
      value = false;
    }
    if (key.length > 1) p[key] = value;
  }
  return p;
};

var internalParams = params(window);
var externalParams = params(window.top);

var mergedParams = Object.assign(externalParams, internalParams);

module.exports = mergedParams;