162 lines
3.9 KiB
JavaScript
162 lines
3.9 KiB
JavaScript
'use strict';
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const Types = require('./types');
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const Utils = require('./utils');
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const internals = {
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needsProtoHack: new Set([Types.set, Types.map, Types.weakSet, Types.weakMap])
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};
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module.exports = internals.clone = function (obj, options = {}, _seen = null) {
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if (typeof obj !== 'object' ||
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obj === null) {
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return obj;
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}
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let clone = internals.clone;
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let seen = _seen;
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if (options.shallow) {
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if (options.shallow !== true) {
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return internals.cloneWithShallow(obj, options);
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}
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clone = (value) => value;
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}
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else {
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seen = seen || new Map();
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const lookup = seen.get(obj);
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if (lookup) {
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return lookup;
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}
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}
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// Built-in object types
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const baseProto = Types.getInternalProto(obj);
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if (baseProto === Types.buffer) {
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return Buffer && Buffer.from(obj); // $lab:coverage:ignore$
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}
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if (baseProto === Types.date) {
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return new Date(obj.getTime());
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}
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if (baseProto === Types.regex) {
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return new RegExp(obj);
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}
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// Generic objects
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const newObj = internals.base(obj, baseProto, options);
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if (newObj === obj) {
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return obj;
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}
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if (seen) {
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seen.set(obj, newObj); // Set seen, since obj could recurse
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}
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if (baseProto === Types.set) {
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for (const value of obj) {
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newObj.add(clone(value, options, seen));
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}
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}
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else if (baseProto === Types.map) {
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for (const [key, value] of obj) {
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newObj.set(key, clone(value, options, seen));
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}
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}
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const keys = Utils.keys(obj, options);
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for (const key of keys) {
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if (key === '__proto__') {
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continue;
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}
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if (baseProto === Types.array &&
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key === 'length') {
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newObj.length = obj.length;
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continue;
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}
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const descriptor = Object.getOwnPropertyDescriptor(obj, key);
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if (descriptor) {
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if (descriptor.get ||
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descriptor.set) {
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Object.defineProperty(newObj, key, descriptor);
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}
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else if (descriptor.enumerable) {
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newObj[key] = clone(obj[key], options, seen);
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}
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else {
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Object.defineProperty(newObj, key, { enumerable: false, writable: true, configurable: true, value: clone(obj[key], options, seen) });
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}
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}
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else {
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Object.defineProperty(newObj, key, {
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enumerable: true,
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writable: true,
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configurable: true,
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value: clone(obj[key], options, seen)
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});
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}
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}
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return newObj;
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};
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internals.cloneWithShallow = function (source, options) {
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const keys = options.shallow;
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options = Object.assign({}, options);
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options.shallow = false;
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const storage = Utils.store(source, keys); // Move shallow copy items to storage
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const copy = internals.clone(source, options); // Deep copy the rest
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Utils.restore(copy, source, storage); // Shallow copy the stored items and restore
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return copy;
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};
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internals.base = function (obj, baseProto, options) {
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if (baseProto === Types.array) {
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return [];
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}
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if (options.prototype === false) { // Defaults to true
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if (internals.needsProtoHack.has(baseProto)) {
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return new baseProto.constructor();
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}
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return {};
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}
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const proto = Object.getPrototypeOf(obj);
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if (proto &&
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proto.isImmutable) {
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return obj;
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}
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if (internals.needsProtoHack.has(baseProto)) {
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const newObj = new proto.constructor();
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if (proto !== baseProto) {
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Object.setPrototypeOf(newObj, proto);
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}
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return newObj;
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}
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return Object.create(proto);
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};
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