Enum

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

Verzia zo dňa 01.11.2019. Pozri najnovšiu verziu.

Tento skript by nemal byť nainštalovaný priamo. Je to knižnica pre ďalšie skripty, ktorú by mali používať cez meta príkaz // @require https://update.greasyforks.org/scripts/391854/745818/Enum.js

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Zalomiť riadky

// ==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);
        }
    };
})();