{"ast":null,"code":"'use strict';\n\nvar has = Object.prototype.hasOwnProperty,\n    undef;\n/**\n * Decode a URI encoded string.\n *\n * @param {String} input The URI encoded string.\n * @returns {String|Null} The decoded string.\n * @api private\n */\n\nfunction decode(input) {\n  try {\n    return decodeURIComponent(input.replace(/\\+/g, ' '));\n  } catch (e) {\n    return null;\n  }\n}\n/**\n * Attempts to encode a given input.\n *\n * @param {String} input The string that needs to be encoded.\n * @returns {String|Null} The encoded string.\n * @api private\n */\n\n\nfunction encode(input) {\n  try {\n    return encodeURIComponent(input);\n  } catch (e) {\n    return null;\n  }\n}\n/**\n * Simple query string parser.\n *\n * @param {String} query The query string that needs to be parsed.\n * @returns {Object}\n * @api public\n */\n\n\nfunction querystring(query) {\n  var parser = /([^=?&]+)=?([^&]*)/g,\n      result = {},\n      part;\n\n  while (part = parser.exec(query)) {\n    var key = decode(part[1]),\n        value = decode(part[2]); //\n    // Prevent overriding of existing properties. This ensures that build-in\n    // methods like `toString` or __proto__ are not overriden by malicious\n    // querystrings.\n    //\n    // In the case if failed decoding, we want to omit the key/value pairs\n    // from the result.\n    //\n\n    if (key === null || value === null || key in result) continue;\n    result[key] = value;\n  }\n\n  return result;\n}\n/**\n * Transform a query string to an object.\n *\n * @param {Object} obj Object that should be transformed.\n * @param {String} prefix Optional prefix.\n * @returns {String}\n * @api public\n */\n\n\nfunction querystringify(obj, prefix) {\n  prefix = prefix || '';\n  var pairs = [],\n      value,\n      key; //\n  // Optionally prefix with a '?' if needed\n  //\n\n  if ('string' !== typeof prefix) prefix = '?';\n\n  for (key in obj) {\n    if (has.call(obj, key)) {\n      value = obj[key]; //\n      // Edge cases where we actually want to encode the value to an empty\n      // string instead of the stringified value.\n      //\n\n      if (!value && (value === null || value === undef || isNaN(value))) {\n        value = '';\n      }\n\n      key = encodeURIComponent(key);\n      value = encodeURIComponent(value); //\n      // If we failed to encode the strings, we should bail out as we don't\n      // want to add invalid strings to the query.\n      //\n\n      if (key === null || value === null) continue;\n      pairs.push(key + '=' + value);\n    }\n  }\n\n  return pairs.length ? prefix + pairs.join('&') : '';\n} //\n// Expose the module.\n//\n\n\nexports.stringify = querystringify;\nexports.parse = querystring;","map":null,"metadata":{},"sourceType":"script"}