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var clone = (function() {

'use strict';

/**

* Clones (copies) an Object using deep copying.

*

* This function supports circular references by default, but if you are certain

* there are no circular references in your object, you can save some CPU time

* by calling clone(obj, false).

*

* Caution: if `circular` is false and `parent` contains circular references,

* your program may enter an infinite loop and crash.

*

* @param `parent` - the object to be cloned

* @param `circular` - set to true if the object to be cloned may contain

* circular references. (optional - true by default)

* @param `depth` - set to a number if the object is only to be cloned to

* a particular depth. (optional - defaults to Infinity)

* @param `prototype` - sets the prototype to be used when cloning an object.

* (optional - defaults to parent prototype).

*/

function clone(parent, circular, depth, prototype) {

var filter;

if (typeof circular === 'object') {

depth = circular.depth;

prototype = circular.prototype;

filter = circular.filter;

circular = circular.circular

}

// maintain two arrays for circular references, where corresponding parents

// and children have the same index

var allParents = [];

var allChildren = [];

var useBuffer = typeof Buffer != 'undefined';

if (typeof circular == 'undefined')

circular = true;

if (typeof depth == 'undefined')

depth = Infinity;

// recurse this function so we don't reset allParents and allChildren

function _clone(parent, depth) {

// cloning null always returns null

if (parent === null)

return null;

if (depth == 0)

return parent;

var child;

var proto;

if (typeof parent != 'object') {

return parent;

}

if (clone.__isArray(parent)) {

child = [];

} else if (clone.__isRegExp(parent)) {

child = new RegExp(parent.source, __getRegExpFlags(parent));

if (parent.lastIndex) child.lastIndex = parent.lastIndex;

} else if (clone.__isDate(parent)) {

child = new Date(parent.getTime());

} else if (useBuffer && Buffer.isBuffer(parent)) {

if (Buffer.allocUnsafe) {

// Node.js >= 4.5.0

child = Buffer.allocUnsafe(parent.length);

} else {

// Older Node.js versions

child = new Buffer(parent.length);

}

parent.copy(child);

return child;

} else {

if (typeof prototype == 'undefined') {

proto = Object.getPrototypeOf(parent);

child = Object.create(proto);

}

else {

child = Object.create(prototype);

proto = prototype;

}

}

if (circular) {

var index = allParents.indexOf(parent);

if (index != -1) {

return allChildren[index];

}

allParents.push(parent);

allChildren.push(child);

}

for (var i in parent) {

var attrs;

if (proto) {

attrs = Object.getOwnPropertyDescriptor(proto, i);

}

if (attrs && attrs.set == null) {

continue;

}

child[i] = _clone(parent[i], depth - 1);

}

return child;

}

return _clone(parent, depth);

}

/**

* Simple flat clone using prototype, accepts only objects, usefull for property

* override on FLAT configuration object (no nested props).

*

* USE WITH CAUTION! This may not behave as you wish if you do not know how this

* works.

*/

clone.clonePrototype = function clonePrototype(parent) {

if (parent === null)

return null;

var c = function () {};

c.prototype = parent;

return new c();

};

// private utility functions

function __objToStr(o) {

return Object.prototype.toString.call(o);

};

clone.__objToStr = __objToStr;

function __isDate(o) {

return typeof o === 'object' && __objToStr(o) === '[object Date]';

};

clone.__isDate = __isDate;

function __isArray(o) {

return typeof o === 'object' && __objToStr(o) === '[object Array]';

};

clone.__isArray = __isArray;

function __isRegExp(o) {

return typeof o === 'object' && __objToStr(o) === '[object RegExp]';

};

clone.__isRegExp = __isRegExp;

function __getRegExpFlags(re) {

var flags = '';

if (re.global) flags += 'g';

if (re.ignoreCase) flags += 'i';

if (re.multiline) flags += 'm';

return flags;

};

clone.__getRegExpFlags = __getRegExpFlags;

return clone;

})();

if (typeof module === 'object' && module.exports) {

module.exports = clone;

}