| 1 | // Licensed to the Software Freedom Conservancy (SFC) under one |
| 2 | // or more contributor license agreements. See the NOTICE file |
| 3 | // distributed with this work for additional information |
| 4 | // regarding copyright ownership. The SFC licenses this file |
| 5 | // to you under the Apache License, Version 2.0 (the |
| 6 | // "License"); you may not use this file except in compliance |
| 7 | // with the License. You may obtain a copy of the License at |
| 8 | // |
| 9 | // http://www.apache.org/licenses/LICENSE-2.0 |
| 10 | // |
| 11 | // Unless required by applicable law or agreed to in writing, |
| 12 | // software distributed under the License is distributed on an |
| 13 | // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| 14 | // KIND, either express or implied. See the License for the |
| 15 | // specific language governing permissions and limitations |
| 16 | // under the License. |
| 17 | |
| 18 | /** |
| 19 | * @fileoverview Provides JSON utilities that uses native JSON parsing where |
| 20 | * possible (a feature not currently offered by Closure). |
| 21 | */ |
| 22 | |
| 23 | goog.provide('bot.json'); |
| 24 | |
| 25 | goog.require('bot.userAgent'); |
| 26 | goog.require('goog.json'); |
| 27 | goog.require('goog.userAgent'); |
| 28 | |
| 29 | |
| 30 | /** |
| 31 | * @define {boolean} NATIVE_JSON indicates whether the code should rely on the |
| 32 | * native {@code JSON} functions, if available. |
| 33 | * |
| 34 | * <p>The JSON functions can be defined by external libraries like Prototype |
| 35 | * and setting this flag to false forces the use of Closure's goog.json |
| 36 | * implementation. |
| 37 | * |
| 38 | * <p>If your JavaScript can be loaded by a third_party site and you are wary |
| 39 | * about relying on the native functions, specify |
| 40 | * "--define bot.json.NATIVE_JSON=false" to the Closure compiler. |
| 41 | */ |
| 42 | bot.json.NATIVE_JSON = true; |
| 43 | |
| 44 | |
| 45 | /** |
| 46 | * Whether the current browser supports the native JSON interface. |
| 47 | * @const |
| 48 | * @see http://caniuse.com/#search=JSON |
| 49 | * @private {boolean} |
| 50 | */ |
| 51 | bot.json.SUPPORTS_NATIVE_JSON_ = |
| 52 | // List WebKit first since every supported version supports |
| 53 | // native JSON (and we can compile away large chunks of code for |
| 54 | // individual fragments by setting the appropriate compiler flags). |
| 55 | goog.userAgent.WEBKIT || |
| 56 | (goog.userAgent.GECKO && bot.userAgent.isEngineVersion(3.5)) || |
| 57 | (goog.userAgent.IE && bot.userAgent.isEngineVersion(8)); |
| 58 | |
| 59 | |
| 60 | /** |
| 61 | * Converts a JSON object to its string representation. |
| 62 | * @param {*} jsonObj The input object. |
| 63 | * @param {?(function(string, *): *)=} opt_replacer A replacer function called |
| 64 | * for each (key, value) pair that determines how the value should be |
| 65 | * serialized. By default, this just returns the value and allows default |
| 66 | * serialization to kick in. |
| 67 | * @return {string} A JSON string representation of the input object. |
| 68 | */ |
| 69 | bot.json.stringify = bot.json.NATIVE_JSON && bot.json.SUPPORTS_NATIVE_JSON_ ? |
| 70 | JSON.stringify : goog.json.serialize; |
| 71 | |
| 72 | |
| 73 | /** |
| 74 | * Parses a JSON string and returns the result. |
| 75 | * @param {string} jsonStr The string to parse. |
| 76 | * @return {*} The JSON object. |
| 77 | * @throws {Error} If the input string is an invalid JSON string. |
| 78 | */ |
| 79 | bot.json.parse = bot.json.NATIVE_JSON && bot.json.SUPPORTS_NATIVE_JSON_ ? |
| 80 | JSON.parse : goog.json.parse; |