106 lines
2.8 KiB
JavaScript
106 lines
2.8 KiB
JavaScript
'use strict';
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/*!
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* node.extend
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* Copyright 2011, John Resig
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* Dual licensed under the MIT or GPL Version 2 licenses.
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* http://jquery.org/license
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*
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* @fileoverview
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* Port of jQuery.extend that actually works on node.js
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*/
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var is = require('is');
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var has = require('has');
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var defineProperty = Object.defineProperty;
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var gOPD = Object.getOwnPropertyDescriptor;
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// If name is '__proto__', and Object.defineProperty is available, define __proto__ as an own property on target
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var setProperty = function setP(target, name, value) {
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if (defineProperty && name === '__proto__') {
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defineProperty(target, name, {
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enumerable: true,
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configurable: true,
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value: value,
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writable: true
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});
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} else {
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target[name] = value;
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}
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};
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// Return undefined instead of __proto__ if '__proto__' is not an own property
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var getProperty = function getP(obj, name) {
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if (name === '__proto__') {
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if (!has(obj, name)) {
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return void 0;
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} else if (gOPD) {
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// In early versions of node, obj['__proto__'] is buggy when obj has
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// __proto__ as an own property. Object.getOwnPropertyDescriptor() works.
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return gOPD(obj, name).value;
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}
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}
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return obj[name];
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};
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module.exports = function extend() {
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var target = arguments[0] || {};
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var i = 1;
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var length = arguments.length;
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var deep = false;
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var options, name, src, copy, copyIsArray, clone;
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// Handle a deep copy situation
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if (typeof target === 'boolean') {
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deep = target;
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target = arguments[1] || {};
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// skip the boolean and the target
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i = 2;
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}
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// Handle case when target is a string or something (possible in deep copy)
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if (typeof target !== 'object' && !is.fn(target)) {
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target = {};
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}
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for (; i < length; i++) {
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// Only deal with non-null/undefined values
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options = arguments[i];
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if (options != null) {
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if (typeof options === 'string') {
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options = options.split('');
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}
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// Extend the base object
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for (name in options) {
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src = getProperty(target, name);
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copy = getProperty(options, name);
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// Prevent never-ending loop
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if (target === copy) {
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continue;
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}
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// Recurse if we're merging plain objects or arrays
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if (deep && copy && (is.hash(copy) || (copyIsArray = is.array(copy)))) {
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if (copyIsArray) {
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copyIsArray = false;
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clone = src && is.array(src) ? src : [];
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} else {
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clone = src && is.hash(src) ? src : {};
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}
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// Never move original objects, clone them
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setProperty(target, name, extend(deep, clone, copy));
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// Don't bring in undefined values
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} else if (typeof copy !== 'undefined') {
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setProperty(target, name, copy);
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}
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}
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}
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}
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// Return the modified object
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return target;
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};
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