Enum

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

Fra 01.11.2019. Se den seneste versjonen.

Dette scriptet burde ikke installeres direkte. Det er et bibliotek for andre script å inkludere med det nye metadirektivet // @require https://update.greasyforks.org/scripts/391854/745818/Enum.js

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// ==UserScript==
// @name         Enum
// @namespace    hoehleg.userscripts.private
// @version      0.1
// @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 add = (thisObj, name, ordinal, text = "") => {
        text = String(text);
        const enumInstance = new class EnumProperty {
            get ordinal() { return ordinal; }
            get name() { return name; }
            get text() { return text; }
            [Symbol.toPrimitive](hint) { return (hint === "number") ? this.ordinal : this.text; }
            valueOf() { return this.ordinal; }
            toString() { return `object Enum ${this.name}`; }
        }();

        console.assert(typeof thisObj.name === "undefined", `duplicate enum [${name}]`);
        console.assert(typeof thisObj.ordinal === "undefined", `duplicate ordinal [${ordinal}] for enum [${name}]`);

        thisObj[name] = thisObj[ordinal] = enumInstance;
    };

    return class Enum {
        constructor(firstOrdinal = 0, ordinalSupplier = previousOrdinal => previousOrdinal + 1) {
            this._firstOrdinal = firstOrdinal;
            this._ordinalSupplier = ordinalSupplier;
        }

        init(enumDef = []) {
            let ordinal;
            const firstOrdinal = this._firstOrdinal;
            const ordinalSupplier = this._ordinalSupplier;

            Object.getOwnPropertyNames(this).forEach(propName => delete this[propName]);

            const ordinals = [];
            for (let enumDefObj of (Array.isArray(enumDef) ? enumDef : [ enumDef ])) {
                for (let [name, text] of Object.entries(enumDefObj)) {
                    ordinal = Number.parseInt((typeof ordinal === "undefined") ? firstOrdinal : ordinalSupplier(ordinal));
                    add(this, name, ordinal, text);
                    ordinals.push(ordinal);
                }
            }
            const enums = [ ...new Set(ordinals) ].sort().map(ordinal => this[ordinal]);

            this[Symbol.iterator] = () => enums[Symbol.iterator]();

            return Object.freeze(this);
        }
    };
})();