mirror of
https://github.com/shaka-project/shaka-player.git
synced 2026-06-15 16:06:41 +03:00
Jacob Trimble
f130dffcef
This is a fully automated change. The linter will fail because the extra indentation caused line-length errors. These won't be fixed automatically. They are fixed in a follow-up to make this one fully automated. Change-Id: I4d8cf9c998985add2bcd24a81c8d65495668c4f3
88 lines
2.5 KiB
JavaScript
88 lines
2.5 KiB
JavaScript
/**
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* @license
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* Copyright 2016 Google Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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goog.provide('shaka.util.ObjectUtils');
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shaka.util.ObjectUtils = class {
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/**
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* Performs a deep clone of the given simple object. This does not copy
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* prototypes, custom properties (e.g. read-only), or multiple references to
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* the same object. If the caller needs these fields, it will need to set them
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* after this returns.
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*
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* @template T
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* @param {T} arg
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* @return {T}
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*/
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static cloneObject(arg) {
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const seenObjects = new Set();
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// This recursively clones the value |val|, using the captured variable
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// |seenObjects| to track the objects we have already cloned.
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const clone = function(val) {
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switch (typeof val) {
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case 'undefined':
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case 'boolean':
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case 'number':
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case 'string':
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case 'symbol':
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case 'function':
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return val;
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case 'object':
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default: {
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// typeof null === 'object'
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if (!val) {
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return val;
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}
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// This covers Uint8Array and friends, even without a TypedArray
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// base-class constructor.
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const isTypedArray =
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val.buffer && val.buffer.constructor == ArrayBuffer;
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if (isTypedArray) {
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return val;
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}
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if (seenObjects.has(val)) {
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return null;
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}
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const isArray = val.constructor == Array;
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if (val.constructor != Object && !isArray) {
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return null;
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}
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seenObjects.add(val);
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const ret = isArray ? [] : {};
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// Note |name| will equal a number for arrays.
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for (const name in val) {
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ret[name] = clone(val[name]);
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}
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// Length is a non-enumerable property, but we should copy it over in
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// case it is not the default.
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if (isArray) {
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ret.length = val.length;
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}
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return ret;
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}
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}
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};
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return clone(arg);
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}
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};
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