105 lines
2.7 KiB
JavaScript
105 lines
2.7 KiB
JavaScript
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'use strict';Object.defineProperty(exports, "__esModule", { value: true });exports.default =
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deepCyclicCopy; /**
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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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*/const EMPTY = new Set(); // Node 6 does not have gOPDs, so we define a simple polyfill for it.
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if (!Object.getOwnPropertyDescriptors) {// $FlowFixMe: polyfill
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Object.getOwnPropertyDescriptors = obj => {const list = {};Object.getOwnPropertyNames(obj).concat(Object.getOwnPropertySymbols(obj)) // $FlowFixMe: assignment with a Symbol is OK.
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.forEach(key => list[key] = Object.getOwnPropertyDescriptor(obj, key));return list;};}function deepCyclicCopy(value) {let options = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : { blacklist: EMPTY, keepPrototype: false };let cycles = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : new WeakMap();if (typeof value !== 'object' || value === null) {return value;} else if (cycles.has(value)) {return cycles.get(value);} else if (Array.isArray(value)) {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(
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object,
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options,
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cycles)
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{
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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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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(
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array,
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options,
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cycles)
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{
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const newArray = options.keepPrototype ?
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// $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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return newArray;
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}
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