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Youtube 翻译中文字幕下载 v7

Youtube 播放器右下角有个 Auto-tranlsate，可以把视频字幕翻成中文。这个脚本是下载这个中文字幕

目前為 2020-12-03 提交的版本，檢視 最新版本。

// ==UserScript==
// @name           Youtube 翻译中文字幕下载 v7
// @include        https://*youtube.com/*
// @author         Cheng Zheng
// @copyright      2018-2021 Cheng Zheng;
// @license        GNU GPL v3.0 or later. http://www.gnu.org/copyleft/gpl.html
// @require        http://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js
// @version        7
// @grant GM_xmlhttpRequest
// @namespace https://greasyfork.org/users/5711
// @description Youtube 播放器右下角有个 Auto-tranlsate，可以把视频字幕翻成中文。这个脚本是下载这个中文字幕
// ==/UserScript==

/*
  作者 : 郑诚
  新浪微博: 糖醋陈皮 https://weibo.com/u/2004104451/home?wvr=5
  邮箱 :  [email protected]
  Github: https://github.com/1c7/Youtube-Auto-Subtitle-Download

  测试视频: 
  https://www.youtube.com/watch?v=nGlQkaoIfBI   1门语言
  https://www.youtube.com/watch?v=O5nskjZ_GoI   13门语言
  https://www.youtube.com/watch?v=VfEz3DIbkvo   测试自动字幕（西班牙语）
*/

(function () {
  // 配置项
  const NO_SUBTITLE = '无字幕';
  const HAVE_SUBTITLE = '下载翻译的中文字幕';
  const TEXT_LOADING = '载入中...';
  const BUTTON_ID = 'youtube-subtitle-downloader-by-1c7'
  // 配置项

  var HASH_BUTTON_ID = `#${BUTTON_ID}`
  var first_load = true;

  // return true / false
  // Detect [new version UI(material design)] OR [old version UI]
  // I tested this, accurated.
  function new_material_design_version() {
    var old_title_element = document.getElementById('watch7-headline');
    if (old_title_element) {
      return false;
    } else {
      return true;
    }
  }

  // trigger when first load (hit refresh button)
  $(document).ready(function () {
    // because document ready still not enough
    // it's still too early, we have to wait certain element exist, then execute function.
    if (new_material_design_version()) {
      var material_checkExist = setInterval(function () {
        if (document.querySelectorAll('.title.style-scope.ytd-video-primary-info-renderer').length) {
          init();
          clearInterval(material_checkExist);
        }
      }, 330);
    } else {
      var checkExist = setInterval(function () {
        if ($('#watch7-headline').length) {
          init();
          clearInterval(checkExist);
        }
      }, 330);
    }

  });

  // trigger when loading new page (actually this would also trigger when first loading, that's not what we want, that's why we need to use firsr_load === false)
  // (new Material design version would trigger this "yt-navigate-finish" event. old version would not.)
  var body = document.getElementsByTagName("body")[0];
  body.addEventListener("yt-navigate-finish", function (event) {
    if (first_load === false) {
      remove_subtitle_download_button();
      init();
    }
  });

  // trigger when loading new page
  // (old version would trigger this "spfdone" event. new Material design version not sure yet.)
  window.addEventListener("spfdone", function (e) {
    if (current_page_is_video_page()) {
      remove_subtitle_download_button();
      var checkExist = setInterval(function () {
        if ($('#watch7-headline').length) {
          init();
          clearInterval(checkExist);
        }
      }, 330);
    }

  });

  // return true / false
  function current_page_is_video_page() {
    return get_video_id() !== null;
  }

  // return string like "RW1ChiWyiZQ",  from "https://www.youtube.com/watch?v=RW1ChiWyiZQ"
  // or null
  function get_video_id() {
    return getURLParameter('v');
  }

  //https://stackoverflow.com/questions/11582512/how-to-get-url-parameters-with-javascript/11582513#11582513
  function getURLParameter(name) {
    return decodeURIComponent((new RegExp('[?|&]' + name + '=' + '([^&;]+?)(&|#|;|$)').exec(location.search) || [null, ''])[1].replace(/\+/g, '%20')) || null;
  }

  function remove_subtitle_download_button() {
    $(HASH_BUTTON_ID).remove();
  }

  function init() {
    unsafeWindow.caption_array = [];
    inject_our_script();
    first_load = false;
  }

  function inject_our_script() {
    var div = document.createElement('div'),
      select = document.createElement('select'),
      option = document.createElement('option'),
      controls = document.getElementById('watch7-headline'); // Youtube video title DIV

    if (new_material_design_version()) {
      div.setAttribute('style', `display: table;
margin-top:4px;
border: 1px solid rgb(0, 183, 90);
cursor: pointer; color: rgb(255, 255, 255);
border-top-left-radius: 3px;
border-top-right-radius: 3px;
border-bottom-right-radius: 3px;
border-bottom-left-radius: 3px;
background-color: #00B75A;
padding: 4px;
padding-right: 8px;
`);
    } else {
      div.setAttribute('style', `display: table;
margin-top:4px;
border: 1px solid rgb(0, 183, 90);
cursor: pointer; color: rgb(255, 255, 255);
border-top-left-radius: 3px;
border-top-right-radius: 3px;
border-bottom-right-radius: 3px;
border-bottom-left-radius: 3px;
background-color: #00B75A;
padding: 3px;
padding-right: 8px;
`);
    }

    div.id = BUTTON_ID;

    select.id = 'captions_selector';
    select.disabled = true;
    select.setAttribute('style', 'display:block; border: 1px solid rgb(0, 183, 90); cursor: pointer; color: rgb(255, 255, 255); background-color: #00B75A;');

    option.textContent = TEXT_LOADING;
    option.selected = true;
    select.appendChild(option);

    // 下拉菜单中选择后的事件侦听
    select.addEventListener('change', function () {
      download_subtitle(this);
    }, false);

    div.appendChild(select);
    // put <select> into <div>

    // put the div into page: new material design
    var title_element = document.querySelectorAll('.title.style-scope.ytd-video-primary-info-renderer');
    if (title_element) {
      $(title_element[0]).after(div);
    }
    // put the div into page: old version
    if (controls) {
      controls.appendChild(div);
    }

    load_language_list(select);

    // <a> element is for download
    var a = document.createElement('a');
    a.style.cssText = 'display:none;';
    a.setAttribute("id", "ForSubtitleDownload");
    var body = document.getElementsByTagName('body')[0];
    body.appendChild(a);
  }

  // Input: 语言代码（代表要从哪个语言转成中文）
  // Ouput: 字幕的 URL，或者 false（找不到的话）
  function get_chinese_subtitle_url(from_language_code) {
    var json = get_json();
    var captionTracks = json.captions.playerCaptionsTracklistRenderer.captionTracks;
    // 有多少种语言，captionTracks 就有多少个数组。

    // 从 captionTracks 里面用 loop 来搜索对应语言。返回 baseUrl。
    var baseURL = '';
    for (var index in captionTracks) {
      var caption = captionTracks[index];
      if (caption.languageCode === from_language_code) {
        baseURL = captionTracks[index].baseUrl;
      }
    }
    if (baseURL == '') {
      return false; // 上面的 loop 要是没找到对应的语言，导致 url 是空，那也只能返回  false
    }
    var chinese_subtitle_url = baseURL + "&tlang=zh-Hans"; // 转成中文字幕
    return chinese_subtitle_url;
  }

  // Trigger when user select <option>
  async function download_subtitle(selector) {
    // if user select first <option>
    // we just return, do nothing.
    if (selector.selectedIndex == 0) {
      return;
    }

    var caption = caption_array[selector.selectedIndex - 1]; // because first <option> is for display, so index-1 
    if (!caption) return;

    var lang_code = caption.lang_code;
    var lang_name = caption.lang_name;

    // if user choose auto subtitle // 如果用户选的是自动字幕
    if (caption.lang_code == 'AUTO') {
      var file_name = get_file_name(lang_name);
      download_auto_subtitle(file_name);
      selector.options[0].selected = true; // after download, select first <option>
      return
    }

    // 如果用户选的是完整字幕
    // 原文
    // sub mean "subtitle"
    var sub_original_url = await get_closed_subtitle_url(lang_code)
    // var sub_original_xml = await get(sub_original_url);

    // 中文
    var sub_translated_url = sub_original_url + "&tlang=" + "zh-Hans"
    var sub_translated_xml = await get(sub_translated_url);

    var sub_translated_srt = parse_youtube_XML_to_object_list(sub_translated_xml)

    var srt_string = object_array_to_SRT_string(sub_translated_srt)
    var title = get_file_name(lang_name);
    downloadString(srt_string, "text/plain", title);

    // after download, select first <option>
    selector.options[0].selected = true;
  }

  // Return something like: "(English)How Did Python Become A Data Science Powerhouse?.srt"
  function get_file_name(x) {
    return `(${x}) ${document.title}.srt`;
  }

  // 载入有多少种语言, 然后加到 <select> 里
  function load_language_list(select) {
    // auto
    var auto_subtitle_exist = false;

    // closed
    var closed_subtitle_exist = false;
    var captions = null;

    // get auto subtitle
    var auto_subtitle_url = get_auto_subtitle_xml_url();
    if (auto_subtitle_url != false) {
      auto_subtitle_exist = true;
      // console.log('自动字幕的确存在');
    } else {
      // console.log('自动字幕不存在');
      // console.log(auto_subtitle_url);
    }

    // get closed subtitle
    var list_url = 'https://video.google.com/timedtext?v=' + get_video_id() + '&type=list&hl=zh-CN';
    // https://video.google.com/timedtext?v=if36bqHypqk&type=list&hl=en // 英文
    // https://video.google.com/timedtext?v=n1zpnN-6pZQ&type=list&hl=zh-CN // 中文

    GM_xmlhttpRequest({
      method: 'GET',
      url: list_url,
      onload: function (xhr) {

        captions = new DOMParser().parseFromString(xhr.responseText, "text/xml").getElementsByTagName('track');
        if (captions.length != 0) {
          closed_subtitle_exist = true;
        }

        // if no subtitle at all, just say no and stop
        if (auto_subtitle_exist == false && closed_subtitle_exist == false) {
          select.options[0].textContent = NO_SUBTITLE;
          disable_download_button();
          return false;
        }

        // if at least one type of subtitle exist
        select.options[0].textContent = HAVE_SUBTITLE;
        select.disabled = false;

        // if at least one type of subtitle exist
        select.options[0].textContent = HAVE_SUBTITLE;
        select.disabled = false;

        var caption = null; // for inside loop
        var option = null; // for <option>
        var caption_info = null; // for our custom object

        // 自动字幕
        if (auto_subtitle_exist) {
          var auto_sub_name = get_auto_subtitle_name()
          // var lang_name = auto_sub_name + " (自动字幕暂不支持双语) "
          var lang_name = `${auto_sub_name} 翻译成 中文`
          caption_info = {
            lang_code: 'AUTO', // later we use this to know if it's auto subtitle
            lang_name: lang_name // for display only
          };
          caption_array.push(caption_info);

          option = document.createElement('option');
          option.textContent = caption_info.lang_name;
          select.appendChild(option);
        }

        // if closed_subtitle_exist
        if (closed_subtitle_exist) {
          for (var i = 0, il = captions.length; i < il; i++) {
            caption = captions[i];
            // console.log(caption); // <track id="0" name="" lang_code="en" lang_original="English" lang_translated="English" lang_default="true"/>
            var lang_code = caption.getAttribute('lang_code')
            var lang_translated = caption.getAttribute('lang_translated')
            var lang_name = `${lang_translated} 翻译成 中文`
            caption_info = {
              lang_code: lang_code, // for AJAX request
              lang_name: lang_name, // display to user
            };
            caption_array.push(caption_info);
            // 注意这里是加到 caption_array, 一个全局变量, 待会要靠它来下载
            option = document.createElement('option');
            option.textContent = caption_info.lang_name;
            select.appendChild(option);
          }
        }
      }
    });
  }

  // 处理时间. 比如 start="671.33"  start="37.64"  start="12" start="23.029"
  // 处理成 srt 时间, 比如 00:00:00,090    00:00:08,460    00:10:29,350
  function process_time(s) {
    s = s.toFixed(3);
    // 超棒的函数, 不论是整数还是小数都给弄成3位小数形式
    // 举个柚子:
    // 671.33 -> 671.330
    // 671 -> 671.000
    // 注意函数会四舍五入. 具体读文档

    var array = s.split('.');
    // 把开始时间根据句号分割
    // 671.330 会分割成数组: [671, 330]

    var Hour = 0;
    var Minute = 0;
    var Second = array[0]; // 671
    var MilliSecond = array[1]; // 330
    // 先声明下变量, 待会把这几个拼好就行了

    // 我们来处理秒数.  把"分钟"和"小时"除出来
    if (Second >= 60) {
      Minute = Math.floor(Second / 60);
      Second = Second - Minute * 60;
      // 把 秒 拆成 分钟和秒, 比如121秒, 拆成2分钟1秒

      Hour = Math.floor(Minute / 60);
      Minute = Minute - Hour * 60;
      // 把 分钟 拆成 小时和分钟, 比如700分钟, 拆成11小时40分钟
    }
    // 分钟，如果位数不够两位就变成两位，下面两个if语句的作用也是一样。
    if (Minute < 10) {
      Minute = '0' + Minute;
    }
    // 小时
    if (Hour < 10) {
      Hour = '0' + Hour;
    }
    // 秒
    if (Second < 10) {
      Second = '0' + Second;
    }
    return Hour + ':' + Minute + ':' + Second + ',' + MilliSecond;
  }

  function downloadFile(fileName, content) {
    var version = getChromeVersion();

    // dummy element for download
    if ($('#youtube-subtitle-downloader-dummy-element-for-download').length > 0) {} else {
      $("body").append('<a id="youtube-subtitle-downloader-dummy-element-for-download"></a>');
    }
    var dummy = $('#youtube-subtitle-downloader-dummy-element-for-download');

    // 判断 Chrome 版本选择下载方法，Chrome 52 和 53 的文件下载方式不一样
    if (version > 52) {
      dummy.attr('download', fileName);
      dummy.attr('href', 'data:Content-type: text/plain,' + htmlDecode(content));
      dummy[0].click();
    } else {
      downloadViaBlob(fileName, htmlDecode(content));
    }
  }

  // 复制自： http://www.alloyteam.com/2014/01/use-js-file-download/
  // Chrome 53 之后这个函数失效。52有效。
  function downloadViaBlob(fileName, content) {
    var aLink = document.createElement('a');
    var blob = new Blob([content]);
    var evt = document.createEvent("HTMLEvents");
    evt.initEvent("click", false, false);
    aLink.download = fileName;
    aLink.href = URL.createObjectURL(blob);
    aLink.dispatchEvent(evt);
  }

  //http://stackoverflow.com/questions/4900436/how-to-detect-the-installed-chrome-version
  function getChromeVersion() {
    var raw = navigator.userAgent.match(/Chrom(e|ium)\/([0-9]+)\./);
    return raw ? parseInt(raw[2], 10) : false;
  }

  // https://css-tricks.com/snippets/javascript/unescape-html-in-js/
  // turn HTML entity back to text, example: &quot; should be "
  function htmlDecode(input) {
    var e = document.createElement('div');
    e.class = 'dummy-element-for-tampermonkey-Youtube-Subtitle-Downloader-script-to-decode-html-entity';
    e.innerHTML = input;
    return e.childNodes.length === 0 ? "" : e.childNodes[0].nodeValue;
  }

  // return URL or null;
  // later we can send a AJAX and get XML subtitle
  function get_auto_subtitle_xml_url() {
    try {
      var json = get_json();
      var captionTracks = json.captions.playerCaptionsTracklistRenderer.captionTracks;
      for (var index in captionTracks) {
        var caption = captionTracks[index];
        if (typeof caption.kind === 'string' && caption.kind == 'asr') {
          return captionTracks[index].baseUrl;
        }
        // ASR – A caption track generated using automatic speech recognition.
        // https://developers.google.com/youtube/v3/docs/captions
      }
    } catch (error) {
      return false;
    }
  }

  function disable_download_button() {
    $(HASH_BUTTON_ID)
      .css('border', '#95a5a6')
      .css('cursor', 'not-allowed')
      .css('background-color', '#95a5a6');
    $('#captions_selector')
      .css('border', '#95a5a6')
      .css('cursor', 'not-allowed')
      .css('background-color', '#95a5a6');

    if (new_material_design_version()) {
      $(HASH_BUTTON_ID).css('padding', '6px');
    } else {
      $(HASH_BUTTON_ID).css('padding', '5px');
    }
  }

  // 下载自动字幕的中英双语
  // 输入: file_name: 保存的文件名
  // 输出: 无 (会触发浏览器下载一个文件)
  async function download_auto_subtitle(file_name) {
    // console.log(`进入了 download_auto_subtitle, 参数 file_name 是 ${file_name}`)
    // 1. English Auto Sub in json3 format
    var auto_sub_url = get_auto_subtitle_xml_url();
    var format_json3_url = auto_sub_url + '&fmt=json3'
    // var en_auto_sub = await get(format_json3_url); // 格式参考 Youtube-Subtitle-Downloader/fmt=json3/en.json
    // console.log(en_auto_sub);

    // 2. 自动字幕的翻译中文
    var cn_url = format_json3_url + '&tlang=zh-Hans'
    // console.log(cn_url);
    var cn_srt = await auto_sub_in_chinese_fmt_json3_to_srt(cn_url) // 格式参考 Youtube-Subtitle-Downloader/fmt=json3/zh-Hans.json
    // console.log(cn_srt);

    // console.log(cn_srt)
    // 到了这一步，cn_srt 的每一个 item 应该是：
    // var item_example = {
    //   "startTime": "00:00:06,640",
    //   "endTime": "00:00:09,760",
    //   "text": "在与朋友的长时间交谈中以及与陌生人的简短交谈中",
    //   "tStartMs": 6640,
    //   "dDurationMs": 3120,
    //   "words": ["in", " a", " long", " conversation", " with", " a", " friend", " and", "a", " short", " chat", " with", " a", " stranger", "the", " endless", " streams"]
    // }

    // 最后保存下来
    var srt_string = auto_sub_dual_language_to_srt(cn_srt) // 结合中文和英文
    // console.log(srt_string);
    downloadString(srt_string, "text/plain", file_name);
  }

  function auto_sub_dual_language_to_srt(srt_array) {
    // var srt_array_item_example = {
    //   "startTime": "00:00:06,640",
    //   "endTime": "00:00:09,760",
    //   "text": "在与朋友的长时间交谈中以及与陌生人的简短交谈中",
    //   "tStartMs": 6640,
    //   "dDurationMs": 3120,
    //   "words": ["in", " a", " long", " conversation", " with", " a", " friend", " and", "a", " short", " chat", " with", " a", " stranger", "the", " endless", " streams"]
    // }

    var result_array = []
    for (let i = 0; i < srt_array.length; i++) {
      const line = srt_array[i];
      var text = line.text; // 中文
      // var text = line.text + NEW_LINE + line.words.join(''); // 中文 \n 英文
      var item = {
        startTime: line.startTime,
        endTime: line.endTime,
        text: text
      }
      result_array.push(item)
    }

    var srt_string = object_array_to_SRT_string(result_array)
    return srt_string
  }

  // return "English (auto-generated)" or a default name;
  function get_auto_subtitle_name() {
    try {
      var json = get_json();
      if (typeof json.captions !== "undefined") {
        var captionTracks = json.captions.playerCaptionsTracklistRenderer.captionTracks;
        for (var index in captionTracks) {
          var caption = captionTracks[index];
          if (typeof caption.kind === 'string' && caption.kind == 'asr') {
            return captionTracks[index].name.simpleText;
          }
        }
      }
    } catch (error) {
      return 'Auto Subtitle';
    }
  }

  // Usage: var result = await get(url)
  function get(url) {
    return $.ajax({
      url: url,
      type: 'get',
      success: function (r) {
        return r
      },
      fail: function (error) {
        return error
      }
    });
  }


  // 输入: url (String)
  // 输出: SRT (Array)
  async function auto_sub_in_chinese_fmt_json3_to_srt(url) {
    var srt_array = []

    var json = await get(url);
    var events = json.events;
    for (let index = 0; index < events.length; index++) {
      const event = events[index];
      var tStartMs = event.tStartMs
      var dDurationMs = event.dDurationMs
      var segs = event.segs
      var text = segs[0].utf8;

      var item = {
        startTime: ms_to_srt(tStartMs),
        endTime: ms_to_srt(tStartMs + dDurationMs),
        text: text,

        tStartMs: tStartMs,
        dDurationMs: dDurationMs,
      }
      srt_array.push(item);
    }
    return srt_array
  }

  // 把毫秒转成 srt 时间
  // 代码来源网络
  function ms_to_srt($milliseconds) {
    var $seconds = Math.floor($milliseconds / 1000);
    var $minutes = Math.floor($seconds / 60);
    var $hours = Math.floor($minutes / 60);
    var $milliseconds = $milliseconds % 1000;
    var $seconds = $seconds % 60;
    var $minutes = $minutes % 60;
    return ($hours < 10 ? '0' : '') + $hours + ':' +
      ($minutes < 10 ? '0' : '') + $minutes + ':' +
      ($seconds < 10 ? '0' : '') + $seconds + ',' +
      ($milliseconds < 100 ? '0' : '') + ($milliseconds < 10 ? '0' : '') + $milliseconds;
  }

  /*
    Input: [ {startTime: "", endTime: "", text: ""}, {...}, {...} ]
    Output: SRT
  */
  function object_array_to_SRT_string(object_array) {
    var result = '';
    var BOM = '\uFEFF';
    result = BOM + result; // store final SRT result

    for (var i = 0; i < object_array.length; i++) {
      var item = object_array[i]
      var index = i + 1;
      var start_time = item.startTime
      var end_time = item.endTime
      var text = item.text

      var new_line = "\n";
      result = result + index + new_line;

      result = result + start_time;
      result = result + ' --> ';
      result = result + end_time + new_line;

      result = result + text + new_line + new_line;
    }

    return result;
  }

  // Copy from: https://gist.github.com/danallison/3ec9d5314788b337b682
  // Thanks! https://github.com/danallison
  // Work in Chrome 66
  // Test passed: 2018-5-19
  function downloadString(text, fileType, fileName) {
    var blob = new Blob([text], {
      type: fileType
    });
    var a = document.createElement('a');
    a.download = fileName;
    a.href = URL.createObjectURL(blob);
    a.dataset.downloadurl = [fileType, a.download, a.href].join(':');
    a.style.display = "none";
    document.body.appendChild(a);
    a.click();
    document.body.removeChild(a);
    setTimeout(function () {
      URL.revokeObjectURL(a.href);
    }, 1500);
  }

  // Input: lang_code like 'en'
  // Output: URL (String)
  async function get_closed_subtitle_url(lang_code) {
    try {
      var json = get_json();
      var captionTracks = json.captions.playerCaptionsTracklistRenderer.captionTracks;
      for (var index in captionTracks) {
        var caption = captionTracks[index];
        if (caption.languageCode === lang_code && caption.kind != 'asr') {
          var url = captionTracks[index].baseUrl;
          return url
        }
      }
    } catch (error) {
      console.log(error);
      return false;
    }
  }

  // Input: XML (provide by Youtube)
  // Output: Array of object
  // each object look like: 
  /*
    {
      startTime: "",
      endTime: "",
      text: ""
    }
  */
  // it's intermediate representation for SRT
  function parse_youtube_XML_to_object_list(youtube_xml_string) {
    if (youtube_xml_string === '' || youtube_xml_string === undefined || youtube_xml_string === null) {
      return false;
    }
    var result_array = []
    var text_nodes = youtube_xml_string.getElementsByTagName('text');
    var len = text_nodes.length;
    for (var i = 0; i < len; i++) {
      var text = text_nodes[i].textContent.toString();
      text = text.replace(/(<([^>]+)>)/ig, ""); // remove all html tag.
      text = htmlDecode(text);

      var start = text_nodes[i].getAttribute('start');
      var end = '';

      if (i + 1 >= len) {
        end = parseFloat(text_nodes[i].getAttribute('start')) + parseFloat(text_nodes[i].getAttribute('dur'));
      } else {
        end = text_nodes[i + 1].getAttribute('start');
      }

      var start_time = process_time(parseFloat(start));
      var end_time = process_time(parseFloat(end));

      var item = {
        startTime: start_time,
        endTime: end_time,
        text: text
      }
      result_array.push(item)
    }

    return result_array
  }

  // return player_response
  // or return null
  function get_json() {
    try {
      var json = null
      if (ytplayer.config.args.player_response) {
        var raw_string = ytplayer.config.args.player_response;
        json = JSON.parse(raw_string);
      }
      if (ytplayer.config.args.raw_player_response) {
        json = ytplayer.config.args.raw_player_response;
      }
      return json
    } catch (error) {
      return null
    }
  }
})();