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Enum

Enumeration class. Each enum propertiy has the properties "ordinal", "name" and "text".

此脚本不应直接安装，它是一个供其他脚本使用的外部库。如果您需要使用该库，请在脚本元属性加入：// @require https://update.cn-greasyfork.org/scripts/391854/746956/Enum.js 

  1. // ==UserScript==
  2. // @name         Enum
  3. // @namespace    hoehleg.userscripts.private
  4. // @version      0.3
  5. // @description  Enumeration class. Each enum propertiy has the properties "ordinal", "name" and "text".
  6. // @author       Gerrit Höhle
  7. // @grant        none
  8. // ==/UserScript==
  9.  
  10. /* jslint esnext: true */
  11. const Enum = class EnumBase {
  12.  
  13.     constructor({ name, ordinal, text } = {}) {
  14.         if (new.target === EnumBase) {
  15.             throw TypeError("Instantiation of abstract enum class");
  16.         }
  17.  
  18.         if (typeof text !== "undefined") {
  19.             text = String(text);
  20.         }
  21.  
  22.         Object.assign(this, {
  23.             get ordinal() { return ordinal; },
  24.             get name() { return name; },
  25.             get text() { return text; }
  26.         });
  27.     }
  28.  
  29.     valueOf() { 
  30.         return this.ordinal; 
  31.     }
  32.  
  33.     toString() { 
  34.         return (typeof this.text === "undefined") ? this.name : this.text;
  35.     }
  36.  
  37.     static init(enumDef = [], firstOrdinal = 0, ordinalSupplier = previousOrdinal => previousOrdinal + 1) {
  38.         if (Object.isFrozen(this)) {
  39.             throw TypeError("Reinitialization of finalized enum class");
  40.         }
  41.  
  42.         let ordinal;
  43.         const ordinals = [];
  44.         for (let enumDefObj of (Array.isArray(enumDef) ? enumDef : [ enumDef ])) {
  45.             if (typeof enumDefObj !== 'object') {
  46.                 enumDefObj = { [enumDefObj]: undefined };
  47.             }
  48.             for (let [name, text] of Object.entries(enumDefObj)) {
  49.                 ordinal = Number.parseInt((typeof ordinal === "undefined") ? firstOrdinal : ordinalSupplier(ordinal));
  50.                 console.assert(typeof this[name] === "undefined", `duplicate enum [${name}]`);
  51.                 console.assert(typeof this[ordinal] === "undefined", `duplicate ordinal [${ordinal}] for enum [${name}]`);
  52.  
  53.                 this[name] = new this({ ordinal, name, text });
  54.                 Object.defineProperty(this, ordinal, { 
  55.                     value: this[name] 
  56.                 });
  57.  
  58.                 ordinals.push(ordinal);
  59.             }
  60.         }
  61.  
  62.         const enums = ordinals.sort().map(ordinal => this[ordinal]);
  63.         Object.defineProperty(this, Symbol.iterator, { value: () => enums[Symbol.iterator]() });
  64.  
  65.         return Object.freeze(this);
  66.     }
  67. };