118 lines
3.2 KiB
JavaScript
118 lines
3.2 KiB
JavaScript
'use strict';
|
|
|
|
var hasOwn = Object.prototype.hasOwnProperty;
|
|
var toStr = Object.prototype.toString;
|
|
var defineProperty = Object.defineProperty;
|
|
var gOPD = Object.getOwnPropertyDescriptor;
|
|
|
|
var isArray = function isArray(arr) {
|
|
if (typeof Array.isArray === 'function') {
|
|
return Array.isArray(arr);
|
|
}
|
|
|
|
return toStr.call(arr) === '[object Array]';
|
|
};
|
|
|
|
var isPlainObject = function isPlainObject(obj) {
|
|
if (!obj || toStr.call(obj) !== '[object Object]') {
|
|
return false;
|
|
}
|
|
|
|
var hasOwnConstructor = hasOwn.call(obj, 'constructor');
|
|
var hasIsPrototypeOf = obj.constructor && obj.constructor.prototype && hasOwn.call(obj.constructor.prototype, 'isPrototypeOf');
|
|
// Not own constructor property must be Object
|
|
if (obj.constructor && !hasOwnConstructor && !hasIsPrototypeOf) {
|
|
return false;
|
|
}
|
|
|
|
// Own properties are enumerated firstly, so to speed up,
|
|
// if last one is own, then all properties are own.
|
|
var key;
|
|
for (key in obj) { /**/ }
|
|
|
|
return typeof key === 'undefined' || hasOwn.call(obj, key);
|
|
};
|
|
|
|
// If name is '__proto__', and Object.defineProperty is available, define __proto__ as an own property on target
|
|
var setProperty = function setProperty(target, options) {
|
|
if (defineProperty && options.name === '__proto__') {
|
|
defineProperty(target, options.name, {
|
|
enumerable: true,
|
|
configurable: true,
|
|
value: options.newValue,
|
|
writable: true
|
|
});
|
|
} else {
|
|
target[options.name] = options.newValue;
|
|
}
|
|
};
|
|
|
|
// Return undefined instead of __proto__ if '__proto__' is not an own property
|
|
var getProperty = function getProperty(obj, name) {
|
|
if (name === '__proto__') {
|
|
if (!hasOwn.call(obj, name)) {
|
|
return void 0;
|
|
} else if (gOPD) {
|
|
// In early versions of node, obj['__proto__'] is buggy when obj has
|
|
// __proto__ as an own property. Object.getOwnPropertyDescriptor() works.
|
|
return gOPD(obj, name).value;
|
|
}
|
|
}
|
|
|
|
return obj[name];
|
|
};
|
|
|
|
module.exports = function extend() {
|
|
var options, name, src, copy, copyIsArray, clone;
|
|
var target = arguments[0];
|
|
var i = 1;
|
|
var length = arguments.length;
|
|
var deep = false;
|
|
|
|
// Handle a deep copy situation
|
|
if (typeof target === 'boolean') {
|
|
deep = target;
|
|
target = arguments[1] || {};
|
|
// skip the boolean and the target
|
|
i = 2;
|
|
}
|
|
if (target == null || (typeof target !== 'object' && typeof target !== 'function')) {
|
|
target = {};
|
|
}
|
|
|
|
for (; i < length; ++i) {
|
|
options = arguments[i];
|
|
// Only deal with non-null/undefined values
|
|
if (options != null) {
|
|
// Extend the base object
|
|
for (name in options) {
|
|
src = getProperty(target, name);
|
|
copy = getProperty(options, name);
|
|
|
|
// Prevent never-ending loop
|
|
if (target !== copy) {
|
|
// Recurse if we're merging plain objects or arrays
|
|
if (deep && copy && (isPlainObject(copy) || (copyIsArray = isArray(copy)))) {
|
|
if (copyIsArray) {
|
|
copyIsArray = false;
|
|
clone = src && isArray(src) ? src : [];
|
|
} else {
|
|
clone = src && isPlainObject(src) ? src : {};
|
|
}
|
|
|
|
// Never move original objects, clone them
|
|
setProperty(target, { name: name, newValue: extend(deep, clone, copy) });
|
|
|
|
// Don't bring in undefined values
|
|
} else if (typeof copy !== 'undefined') {
|
|
setProperty(target, { name: name, newValue: copy });
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// Return the modified object
|
|
return target;
|
|
};
|