Enumeration class. Each enum propertiy has the properties "ordinal", "name" and "text".
此腳本不應該直接安裝，它是一個供其他腳本使用的函式庫。欲使用本函式庫，請在腳本 metadata 寫上： // @require https://update.greasyfork.org/scripts/391854/746956/Enum.js
// ==UserScript==
// @name Enum
// @namespace hoehleg.userscripts.private
// @version 0.3
// @description Enumeration class. Each enum propertiy has the properties "ordinal", "name" and "text".
// @author Gerrit Höhle
// @grant none
// ==/UserScript==
/* jslint esnext: true */
const Enum = class EnumBase {
constructor({ name, ordinal, text } = {}) {
if (new.target === EnumBase) {
throw TypeError("Instantiation of abstract enum class");
}
if (typeof text !== "undefined") {
text = String(text);
}
Object.assign(this, {
get ordinal() { return ordinal; },
get name() { return name; },
get text() { return text; }
});
}
valueOf() {
return this.ordinal;
}
toString() {
return (typeof this.text === "undefined") ? this.name : this.text;
}
static init(enumDef = [], firstOrdinal = 0, ordinalSupplier = previousOrdinal => previousOrdinal + 1) {
if (Object.isFrozen(this)) {
throw TypeError("Reinitialization of finalized enum class");
}
let ordinal;
const ordinals = [];
for (let enumDefObj of (Array.isArray(enumDef) ? enumDef : [ enumDef ])) {
if (typeof enumDefObj !== 'object') {
enumDefObj = { [enumDefObj]: undefined };
}
for (let [name, text] of Object.entries(enumDefObj)) {
ordinal = Number.parseInt((typeof ordinal === "undefined") ? firstOrdinal : ordinalSupplier(ordinal));
console.assert(typeof this[name] === "undefined", `duplicate enum [${name}]`);
console.assert(typeof this[ordinal] === "undefined", `duplicate ordinal [${ordinal}] for enum [${name}]`);
this[name] = new this({ ordinal, name, text });
Object.defineProperty(this, ordinal, {
value: this[name]
});
ordinals.push(ordinal);
}
}
const enums = ordinals.sort().map(ordinal => this[ordinal]);
Object.defineProperty(this, Symbol.iterator, { value: () => enums[Symbol.iterator]() });
return Object.freeze(this);
}
};