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// Copyright 2013 The Closure Library Authors. All Rights Reserved.
//
// 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 Utility to attempt native JSON processing, falling back to
* goog.json if not available.
*
* This is intended as a drop-in for current users of goog.json who want
* to take advantage of native JSON if present.
*
* @author nnaze@google.com (Nathan Naze)
*/
goog.provide('goog.json.hybrid');
goog.require('goog.asserts');
goog.require('goog.json');
/**
* Attempts to serialize the JSON string natively, falling back to
* {@code goog.json.serialize} if unsuccessful.
* @param {!Object} obj JavaScript object to serialize to JSON.
* @return {string} Resulting JSON string.
*/
goog.json.hybrid.stringify =
goog.json.USE_NATIVE_JSON ? goog.global['JSON']['stringify'] : function(
obj) {
if (goog.global.JSON) {
try {
return goog.global.JSON.stringify(obj);
} catch (e) {
// Native serialization failed. Fall through to retry with
// goog.json.serialize.
}
}
return goog.json.serialize(obj);
};
/**
* Attempts to parse the JSON string natively, falling back to
* the supplied {@code fallbackParser} if unsuccessful.
* @param {string} jsonString JSON string to parse.
* @param {function(string):Object} fallbackParser Fallback JSON parser used
* if native
* @return {?Object} Resulting JSON object.
* @private
*/
goog.json.hybrid.parse_ = function(jsonString, fallbackParser) {
if (goog.global.JSON) {
try {
var obj = goog.global.JSON.parse(jsonString);
goog.asserts.assert(typeof obj == 'object');
return /** @type {?Object} */ (obj);
} catch (e) {
// Native parse failed. Fall through to retry with goog.json.parse.
}
}
return fallbackParser(jsonString);
};
/**
* Attempts to parse the JSON string natively, falling back to
* {@code goog.json.parse} if unsuccessful.
* @param {string} jsonString JSON string to parse.
* @return {?Object} Resulting JSON object.
*/
goog.json.hybrid.parse =
goog.json.USE_NATIVE_JSON ? goog.global['JSON']['parse'] : function(
jsonString) {
return goog.json.hybrid.parse_(jsonString, goog.json.parse);
};
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