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Enumeration class. Each enum propertiy has the properties "ordinal", "name" and "text".
As of
This script should not be not be installed directly. It is a library for other scripts to include with the meta directive // @require https://update.greasyfork.org/scripts/391854/746195/Enum.js
// ==UserScript==
// @name Enum
// @namespace hoehleg.userscripts.private
// @version 0.2
// @description Enumeration class. Each enum propertiy has the properties "ordinal", "name" and "text".
// @author Gerrit Höhle
// @grant none
// ==/UserScript==
/* jslint esnext: true */
const Enum = (() => {
const initializing = Symbol("initializing");
const createEnumInstance = (enumClass, name, ordinal, text = "") => {
text = String(text);
return Object.assign(new enumClass(initializing), {
get ordinal() { return ordinal; },
get name() { return name; },
get text() { return text; },
});
};
return class EnumBase {
constructor(processIndicator) {
if (processIndicator !== initializing) {
throw TypeError("Instantiation of abstract enum class");
}
}
valueOf() { return this.ordinal; }
toString() { return this.text || this.name; }
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]: "" };
}
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}]`);
ordinals.push(ordinal);
this[name] = createEnumInstance(this, name, ordinal, text);
Object.defineProperty(this, ordinal, { value: this[name] });
}
}
const enums = ordinals.sort().map(ordinal => this[ordinal]);
Object.defineProperty(this, Symbol.iterator, { value: () => enums[Symbol.iterator]() });
return Object.freeze(this);
}
};
})();