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- // Big thanks to @WebReflection for sorting this out
- // https://gist.github.com/WebReflection/5593554
- 'use strict';
- var isObject = require('../is-object')
- , value = require('../valid-value')
- , isPrototypeOf = Object.prototype.isPrototypeOf
- , defineProperty = Object.defineProperty
- , nullDesc = { configurable: true, enumerable: false, writable: true,
- value: undefined }
- , validate;
- validate = function (obj, prototype) {
- value(obj);
- if ((prototype === null) || isObject(prototype)) return obj;
- throw new TypeError('Prototype must be null or an object');
- };
- module.exports = (function (status) {
- var fn, set;
- if (!status) return null;
- if (status.level === 2) {
- if (status.set) {
- set = status.set;
- fn = function (obj, prototype) {
- set.call(validate(obj, prototype), prototype);
- return obj;
- };
- } else {
- fn = function (obj, prototype) {
- validate(obj, prototype).__proto__ = prototype;
- return obj;
- };
- }
- } else {
- fn = function self(obj, prototype) {
- var isNullBase;
- validate(obj, prototype);
- isNullBase = isPrototypeOf.call(self.nullPolyfill, obj);
- if (isNullBase) delete self.nullPolyfill.__proto__;
- if (prototype === null) prototype = self.nullPolyfill;
- obj.__proto__ = prototype;
- if (isNullBase) defineProperty(self.nullPolyfill, '__proto__', nullDesc);
- return obj;
- };
- }
- return Object.defineProperty(fn, 'level', { configurable: false,
- enumerable: false, writable: false, value: status.level });
- }((function () {
- var x = Object.create(null), y = {}, set
- , desc = Object.getOwnPropertyDescriptor(Object.prototype, '__proto__');
- if (desc) {
- try {
- set = desc.set; // Opera crashes at this point
- set.call(x, y);
- } catch (ignore) { }
- if (Object.getPrototypeOf(x) === y) return { set: set, level: 2 };
- }
- x.__proto__ = y;
- if (Object.getPrototypeOf(x) === y) return { level: 2 };
- x = {};
- x.__proto__ = y;
- if (Object.getPrototypeOf(x) === y) return { level: 1 };
- return false;
- }())));
- require('../create');
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