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