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Common.Utils

Classes for your scripts

Dieses Skript sollte nicht direkt installiert werden. Es handelt sich hier um eine Bibliothek für andere Skripte, welche über folgenden Befehl in den Metadaten eines Skriptes eingebunden wird // @require https://update.greasyfork.org/scripts/389765/1090053/CommonUtils.js 

// ==UserScript==
// @name         Common.Utils
// @description  Classes for your scripts
// @author       Anton Shevchuk
// @license      MIT License
// @version      0.0.7
// @match        *://*/*
// @grant        none
// @namespace    https://greasyfork.org/users/227648
// ==/UserScript==

/**
 * Object with wrapper with getters and setters
 */
class Container {
  constructor() {
    this.container = {};
  }
  /**
   * @param {String[]} keys
   * @param {String}   value
   */
  set(keys, value) {
    this._set(this.container, keys, value);
  }
  _set(elements, keys, value) {
    let key = keys.shift();
    if (typeof elements[key] === 'undefined') {
      elements[key] = {};
    }
    if (keys.length === 0) {
      elements[key] = value;
    } else {
      this._set(elements[key], keys, value);
    }
  }
  /**
   * @param {String} keys
   * @return {null|*}
   */
  get(...keys) {
    if (keys.length === 0) {
      return this.container
    }
    if (this.has(...keys)) {
      return this._get(this.container, ...keys);
    } else {
      return null;
    }
  }
  _get(elements, ...keys) {
    let key = keys.shift();
    if (typeof elements[key] === 'undefined') {
      return null;
    }
    if (keys.length === 0) {
      return elements[key];
    } else {
      return this._get(elements[key], ...keys);
    }
  }
  /**
   * @param {String} keys
   * @return {boolean}
   */
  has(...keys) {
    return this._has(this.container, ...keys);
  }
  _has(elements, ...keys) {
    let key = keys.shift();
    if (typeof elements[key] === 'undefined') {
      return false;
    }
    if (keys.length === 0) {
      return true;
    } else {
      return this._has(elements[key], ...keys);
    }
  }
}

/**
 * Simple cache object with getters and setters
 */
class SimpleCache extends Container {
  /**
   * @param {String} key
   * @param {*} value
   */
  set(key, value) {
    super.set([key], value);
  }
}

/**
 * Settings object with localStorage as storage
 */
class Settings extends Container {
  constructor(uid, def = {}) {
    super();
    this.uid = uid;
    this.default = def;
    this.load();
  }
  load() {
    let settings = localStorage.getItem(this.uid);
    if (settings) {
      settings = JSON.parse(settings);
      this.container = Tools.mergeDeep({}, this.default, settings);
    } else {
      this.container = this.default;
    }
  }
  /**
   * With jQuery:
   *   $(window).on('beforeunload', () => SettingsInstance.save() );
   */
  save() {
    localStorage.setItem(this.uid, JSON.stringify(this.container));
  }
}

/**
 * Static functions
 */
class Tools {
  /**
   * Simple object check
   * @param {Object} item
   * @returns {Boolean}
   */
  static isObject(item) {
    return (item && typeof item === 'object' && !Array.isArray(item));
  }

  /**
   * Deep merge objects
   * @param {Object} target
   * @param {Array} sources
   */
  static mergeDeep(target, ...sources) {
    if (!sources.length) return target;
    const source = sources.shift();

    if (Tools.isObject(target) && Tools.isObject(source)) {
      for (const key in source) {
        if (Tools.isObject(source[key])) {
          if (!target[key]) Object.assign(target, { [key]: {} });
          Tools.mergeDeep(target[key], source[key]);
        } else {
          Object.assign(target, { [key]: source[key] });
        }
      }
    }
    return Tools.mergeDeep(target, ...sources);
  }
}