text: // Copyright 2012 WebDriver committers
  // Copyright 2012 Google Inc.
  //
  // Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
  //
  // Unless required by applicable law or agreed to in writing, software
  // distributed under the License is distributed on an "AS IS" BASIS,
  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  // See the License for the specific language governing permissions and
  // limitations under the License.
  
  /**
   * @fileoverview Provides JSON utilities that uses native JSON parsing where
   * possible (a feature not currently offered by Closure).
   */
  
  goog.provide('bot.json');
  
  goog.require('bot.userAgent');
  goog.require('goog.json');
  goog.require('goog.userAgent');
  
  
  /**
   * @define {boolean} NATIVE_JSON indicates whether the code should rely on the
   * native {@ocde JSON} functions, if available.
   *
   * <p>The JSON functions can be defined by external libraries like Prototype
   * and setting this flag to false forces the use of Closure's goog.json
   * implementation.
   *
   * <p>If your JavaScript can be loaded by a third_party site and you are wary
   * about relying on the native functions, specify
   * "--define bot.json.NATIVE_JSON=false" to the Closure compiler.
   */
  bot.json.NATIVE_JSON = true;
  
  
  /**
   * Whether the current browser supports the native JSON interface.
   * @type {boolean}
   * @const
   * @see http://caniuse.com/#search=JSON
   * @private
   */
  bot.json.SUPPORTS_NATIVE_JSON_ =
      // List WebKit and Opera first since every supported version of these
      // browsers supports native JSON (and we can compile away large chunks of
      // code for individual fragments by setting the appropriate compiler flags).
      goog.userAgent.WEBKIT || goog.userAgent.OPERA ||
          (goog.userAgent.GECKO && bot.userAgent.isEngineVersion(3.5)) ||
          (goog.userAgent.IE && bot.userAgent.isEngineVersion(8));
  
  
  /**
   * Converts a JSON object to its string representation.
   * @param {*} jsonObj The input object.
   * @param {?(function(string, *): *)=} opt_replacer A replacer function called
   *     for each (key, value) pair that determines how the value should be
   *     serialized. By default, this just returns the value and allows default
   *     serialization to kick in.
   * @return {string} A JSON string representation of the input object.
   */
  bot.json.stringify = bot.json.NATIVE_JSON && bot.json.SUPPORTS_NATIVE_JSON_ ?
      JSON.stringify : goog.json.serialize;
  
  
  /**
   * Parses a JSON string and returns the result.
   * @param {string} jsonStr The string to parse.
   * @return {*} The JSON object.
   * @throws {Error} If the input string is an invalid JSON string.
   */
  bot.json.parse = bot.json.NATIVE_JSON && bot.json.SUPPORTS_NATIVE_JSON_ ?
      JSON.parse : goog.json.parse;
  