mirror of
https://github.com/shaka-project/shaka-player.git
synced 2026-06-14 15:56:38 +03:00
Joey Parrish
7091275cbf
This replaces almost every instance of indexOf on both String and Array. There are very few places where we really wanted an index. Mostly, indexOf was used to check for inclusion. Change-Id: I08e299768b6ffdb4bfc30b39b5d82a058c6d1b56
86 lines
2.5 KiB
JavaScript
86 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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let 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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let 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) return val;
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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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let ret = isArray ? [] : {};
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// Note |name| will equal a number for arrays.
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for (let 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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