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Extend.js
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Extend.js
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/**
* @author Richard Davey <rich@photonstorm.com>
* @copyright 2020 Photon Storm Ltd.
* @license {@link https://opensource.org/licenses/MIT|MIT License}
*/
var IsPlainObject = require('./IsPlainObject');
// @param {boolean} deep - Perform a deep copy?
// @param {object} target - The target object to copy to.
// @return {object} The extended object.
/**
* This is a slightly modified version of http://api.jquery.com/jQuery.extend/
*
* @function Phaser.Utils.Objects.Extend
* @since 3.0.0
*
* @param {...*} [args] - The objects that will be mixed.
*
* @return {object} The extended object.
*/
var Extend = function ()
{
var options, name, src, copy, copyIsArray, clone,
target = arguments[0] || {},
i = 1,
length = arguments.length,
deep = false;
// Handle a deep copy situation
if (typeof target === 'boolean')
{
deep = target;
target = arguments[1] || {};
// skip the boolean and the target
i = 2;
}
// extend Phaser if only one argument is passed
if (length === i)
{
target = this;
--i;
}
for (; i < length; i++)
{
// Only deal with non-null/undefined values
if ((options = arguments[i]) != null)
{
// Extend the base object
for (name in options)
{
src = target[name];
copy = options[name];
// Prevent never-ending loop
if (target === copy)
{
continue;
}
// Recurse if we're merging plain objects or arrays
if (deep && copy && (IsPlainObject(copy) || (copyIsArray = Array.isArray(copy))))
{
if (copyIsArray)
{
copyIsArray = false;
clone = src && Array.isArray(src) ? src : [];
}
else
{
clone = src && IsPlainObject(src) ? src : {};
}
// Never move original objects, clone them
target[name] = Extend(deep, clone, copy);
// Don't bring in undefined values
}
else if (copy !== undefined)
{
target[name] = copy;
}
}
}
}
// Return the modified object
return target;
};
module.exports = Extend;