/*!
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* Node.JS module "Deep Extend"
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* @description Recursive object extending.
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* @author Viacheslav Lotsmanov (unclechu) <lotsmanov89@gmail.com>
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* @license MIT
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2013 Viacheslav Lotsmanov
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy of
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* this software and associated documentation files (the "Software"), to deal in
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* the Software without restriction, including without limitation the rights to
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* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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* the Software, and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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/**
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* Extening object that entered in first argument.
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* Returns extended object or false if have no target object or incorrect type.
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* If you wish to clone object, simply use that:
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* deepExtend({}, yourObj_1, [yourObj_N]) - first arg is new empty object
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*/
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var deepExtend = module.exports = function (/*obj_1, [obj_2], [obj_N]*/) {
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if (arguments.length < 1 || typeof arguments[0] !== 'object') {
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return false;
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}
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if (arguments.length < 2) return arguments[0];
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var target = arguments[0];
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// convert arguments to array and cut off target object
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var args = Array.prototype.slice.call(arguments, 1);
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var key, val, src, clone, tmpBuf;
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args.forEach(function (obj) {
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if (typeof obj !== 'object') return;
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for (key in obj) {
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if ( ! (key in obj)) continue;
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src = target[key];
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val = obj[key];
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if (val === target) continue;
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if (typeof val !== 'object' || val === null) {
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target[key] = val;
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continue;
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} else if (val instanceof Buffer) {
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tmpBuf = new Buffer(val.length);
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val.copy(tmpBuf);
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target[key] = tmpBuf;
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continue;
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} else if (val instanceof Date) {
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target[key] = new Date(val.getTime());
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continue;
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}
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if (typeof src !== 'object' || src === null) {
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clone = (Array.isArray(val)) ? [] : {};
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target[key] = deepExtend(clone, val);
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continue;
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}
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if (Array.isArray(val)) {
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clone = (Array.isArray(src)) ? src : [];
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} else {
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clone = (!Array.isArray(src)) ? src : {};
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}
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target[key] = deepExtend(clone, val);
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}
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});
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return target;
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}
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