Common.Utils

Classes for your scripts
目前为 2020-07-02 提交的版本。查看最新版本。
此脚本不应直接安装，它是一个供其他脚本使用的外部库。如果您需要使用该库，请在脚本元属性加入：// @require https://update.gf.qytechs.cn/scripts/389765/822474/CommonUtils.js
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Wrap lines
// ==UserScript==
// @name         Common.Utils
// @description  Classes for your scripts
// @author       Anton Shevchuk
// @license      MIT License
// @version      0.0.4
// @match        *://*/*
// @grant        none
// @namespace    https://gf.qytechs.cn/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 (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 item
   * @returns {boolean}
   */
  static isObject(item) {
    return (item && typeof item === 'object' && !Array.isArray(item));
  }

  /**
   * Deep merge objects
   * @param 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);
  }

  /**
   * Copy to clipboard
   *
   * @param {String} text
   * @link https://hackernoon.com/copying-text-to-clipboard-with-javascript-df4d4988697f
   */
  static copyToClipboard(text) {
    const el = document.createElement('textarea');  // Create a <textarea> element
    el.value = text;                                // Set its value to the string that you want copied
    el.setAttribute('readonly', '');                // Make it readonly to be tamper-proof
    el.style.position = 'absolute';
    el.style.left = '-9999px';                      // Move outside the screen to make it invisible
    document.body.appendChild(el);                  // Append the <textarea> element to the HTML document
    const selected =
      document.getSelection().rangeCount > 0        // Check if there is any content selected previously
        ? document.getSelection().getRangeAt(0)     // Store selection if found
        : false;                                    // Mark as false to know no selection existed before
    el.select();                                    // Select the <textarea> content
    document.execCommand('copy');                   // Copy - only works as a result of a user action (e.g. click events)
    document.body.removeChild(el);                  // Remove the <textarea> element
    if (selected) {                                 // If a selection existed before copying
      document.getSelection().removeAllRanges();    // Unselect everything on the HTML document
      document.getSelection().addRange(selected);   // Restore the original selection
    }
  }
}
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