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$Boolean

Handles persistent storage of boolean values.

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.cn-greasyfork.org/scripts/449472/1081058/%24Boolean.js 

  1. // ==UserScript==
  2. // @name        $Boolean
  3. // @author      Callum Latham <callumtylerlatham@gmail.com>
  4. // @exclude     *
  5. // @description Handles persistent storage of boolean values.
  6. // ==/UserScript==
  7.  
  8. class $Boolean {
  9.     constructor(KEY, DEFAULT = true) {
  10.         // PRIVATE STATE
  11.  
  12.         let value;
  13.  
  14.         // PRIVATE FUNCTIONS
  15.  
  16.         const getError = (message, error) => {
  17.             if (error) {
  18.                 console.error(error);
  19.             }
  20.  
  21.             return new Error(`[$Toggle] ${message}`);
  22.         };
  23.  
  24.         const set = (_value) => {
  25.             value = _value;
  26.  
  27.             if (typeof GM.setValue !== 'function') {
  28.                 return Promise.reject(getError('The GM.setValue permission is required to store data.'));
  29.             }
  30.  
  31.             return GM.setValue(KEY, value);
  32.         };
  33.  
  34.         // PUBLIC FUNCTIONS
  35.  
  36.         this.init = () => {
  37.             if (typeof GM.getValue !== 'function') {
  38.                 return Promise.reject(getError('The GM.getValue permission is required to retrieve data.'));
  39.             }
  40.  
  41.             return GM.getValue(KEY, DEFAULT)
  42.                 .then(set);
  43.         };
  44.  
  45.         this.toggle = () => set(!value);
  46.  
  47.         this.get = () => value;
  48.     };
  49. }