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PrivateProperty

Weakly references a value to a specified object. May be used to create private fields.

Script này sẽ không được không được cài đặt trực tiếp. Nó là một thư viện cho các script khác để bao gồm các chỉ thị meta // @require https://greasyfork.org/scripts/391608-privateproperty/code/PrivateProperty.js?version=744693

// ==UserScript==
// @name         PrivateProperty
// @namespace    hoehleg.userscripts.private
// @version      0.2
// @description  Weakly references a value to a specified object. May be used to create private fields.
// @author       Gerrit Höhle
// @grant        none
// ==/UserScript==

/* jshint esversion: 6 */
const PrivateProperty = (() => {
    let prototypeFunctions;

    class PrivateProperty {

        constructor(initialValue) {
            this._weakReferences = new WeakMap();
            this._initialValue = initialValue;
        }

        init(object, initialValueSpecific = this._initialValue) {
            const value = (typeof initialValueSpecific === "function") ? initialValueSpecific() : initialValueSpecific;
            this._weakReferences.delete(object);
            this._weakReferences.set(object, {
                initialValue: initialValueSpecific,
                value: value
            });
            return this;
        }

        has(object) {
            return this._weakReferences.has(object);
        }

        get(object) {
            const data = this._weakReferences.get(object);
            if (data) {
                return data.value;
            }
        }

        set(object, value) {
            const data = this._weakReferences.get(object) || {
                initialValue: this._initialValue
            };
            data.value = value;
            this._weakReferences.set(object, data);
        }

        getInitialValue(object) {
            const data = this._weakReferences.get(object);
            return data ? data.initialValue : this._initialValue;
        }

        getOrCompute(object, fnc) {
            let data = this._weakReferences.get(object);
            if (!data) {
                data = {
                    initialValue: this._initialValue,
                    value: fnc()
                };
                this._weakReferences.set(object, data);
            }
            return data.value;
        }

        for(object) {
            const bound = prototypeFunctions.map(([propName, fnc]) => ({ [propName]: fnc.bind(this, object) }));
            return Object.assign({}, ...bound);
        }
    }

    prototypeFunctions = Object.getOwnPropertyNames(PrivateProperty.prototype)
        .filter(propName => typeof PrivateProperty.prototype[propName] === "function")
        .filter(propName => propName !== "constructor")
        .filter(propName => propName !== "for")
        .map(propName => ([ [propName], PrivateProperty.prototype[propName] ]));

    return PrivateProperty;
})();