103 lines
2.7 KiB
JavaScript
103 lines
2.7 KiB
JavaScript
'use strict';
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Object.defineProperty(exports, '__esModule', {
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value: true
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});
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exports.default = deepCyclicCopy;
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/**
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* Copyright (c) 2017-present, Facebook, Inc. All rights reserved.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*
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*
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*/
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const EMPTY = new Set();
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// $FlowFixMe: Node 6 does not have gOPDs, so we define a simple polyfill for it.
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if (!Object.getOwnPropertyDescriptors) {
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// $FlowFixMe: polyfill
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Object.getOwnPropertyDescriptors = obj => {
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const list = {};
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Object.getOwnPropertyNames(obj)
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.concat(Object.getOwnPropertySymbols(obj))
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// $FlowFixMe: assignment with a Symbol is OK.
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.forEach(key => (list[key] = Object.getOwnPropertyDescriptor(obj, key)));
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return list;
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};
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}
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function deepCyclicCopy(value) {
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let options =
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arguments.length > 1 && arguments[1] !== undefined
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? arguments[1]
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: {blacklist: EMPTY, keepPrototype: false};
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let cycles =
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arguments.length > 2 && arguments[2] !== undefined
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? arguments[2]
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: new WeakMap();
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if (typeof value !== 'object' || value === null) {
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return value;
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} else if (cycles.has(value)) {
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return cycles.get(value);
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} else if (Array.isArray(value)) {
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return deepCyclicCopyArray(value, options, cycles);
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} else {
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return deepCyclicCopyObject(value, options, cycles);
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}
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}
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function deepCyclicCopyObject(object, options, cycles) {
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const newObject = options.keepPrototype
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? Object.create(Object.getPrototypeOf(object))
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: {};
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// $FlowFixMe: Object.getOwnPropertyDescriptors is polyfilled above.
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const descriptors = Object.getOwnPropertyDescriptors(object);
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cycles.set(object, newObject);
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Object.keys(descriptors).forEach(key => {
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if (options.blacklist && options.blacklist.has(key)) {
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delete descriptors[key];
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return;
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}
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const descriptor = descriptors[key];
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if (typeof descriptor.value !== 'undefined') {
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descriptor.value = deepCyclicCopy(
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descriptor.value,
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{blacklist: EMPTY, keepPrototype: options.keepPrototype},
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cycles
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);
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}
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descriptor.configurable = true;
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});
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return Object.defineProperties(newObject, descriptors);
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}
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function deepCyclicCopyArray(array, options, cycles) {
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const newArray = options.keepPrototype // $FlowFixMe: getPrototypeOf an array is OK.
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? new (Object.getPrototypeOf(array)).constructor(array.length)
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: [];
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const length = array.length;
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cycles.set(array, newArray);
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for (let i = 0; i < length; i++) {
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newArray[i] = deepCyclicCopy(
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array[i],
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{blacklist: EMPTY, keepPrototype: options.keepPrototype},
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cycles
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);
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}
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return newArray;
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}
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