GitHub汉化插件

GitHub汉化插件，包含人机翻译
当前为 2021-04-07 提交的版本，查看最新版本。
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// ==UserScript==
// @name                GitHub Internationalization
// @name:zh-CN          GitHub汉化插件
// @name:ja             GitHub日本語
// @namespace           https://github.com/k1995/github-i18n-plugin/
// @version             0.11
// @description         Translate GitHub.com
// @description:zh      GitHub汉化插件，包含人机翻译
// @description:zh-CN   GitHub汉化插件，包含人机翻译
// @description:ja      GitHub日本語プラグイン
// @author              k1995
// @match               https://github.com/*
// @match               https://gist.github.com/*
// @grant               GM_xmlhttpRequest
// @grant               GM_getResourceText
// @resource            zh-CN https://www.githubs.cn/raw-githubusercontent/k1995/github-i18n-plugin/master/locales/zh-CN.json?v=20210407
// @resource            ja https://www.githubs.cn/raw-githubusercontent/k1995/github-i18n-plugin/master/locales/ja.json
// @require             https://cdn.bootcdn.net/ajax/libs/timeago.js/4.0.2/timeago.full.min.js
// @require             https://cdn.bootcdn.net/ajax/libs/jquery/3.5.1/jquery.min.js
// ==/UserScript==
 
(function() {
  'use strict';
 
  const SUPPORT_LANG = ["zh-CN", "ja"];
  const lang = (navigator.language || navigator.userLanguage);
  const locales = getLocales(lang)
 
  translateByCssSelector();
  translateDesc();
  traverseElement(document.body);
  watchUpdate();
 
  function getLocales(lang) {
    if(lang.startsWith("zh")) { // zh zh-TW --> zh-CN
      lang = "zh-CN";
    }
    if(SUPPORT_LANG.includes(lang)) {
      return JSON.parse(GM_getResourceText(lang));
    }
    return {
      css: [],
      dict: {}
    };
  }
 
  function translateRelativeTimeEl(el) {
    const datetime = $(el).attr('datetime');
    $(el).text(timeago.format(datetime, lang.replace('-', '_')));
  }
 
  function translateElement(el) {
    // Get the text field name
    let k;
    if(el.tagName === "INPUT") {
      if (el.type === 'button' || el.type === 'submit') {
        k = 'value';
      } else {
        k = 'placeholder';
      }
    } else {
      k = 'data';
    }
 
    const txtSrc = el[k].trim();
    const key = txtSrc.toLowerCase()
        .replace(/\xa0/g, ' ') // replace '&nbsp;'
        .replace(/\s{2,}/g, ' ');
 
    if(locales.dict[key]) {
      el[k] = el[k].replace(txtSrc, locales.dict[key])
    }
  }
 
  function shoudTranslateEl(el) {
    const blockIds = ["readme"];
    const blockClass = ["CodeMirror"];
    const blockTags = ["CODE", "SCRIPT", "LINK", "IMG", "svg", "TABLE", "ARTICLE"];
 
    if(blockTags.includes(el.tagName)) {
      return false;
    }
 
    if(el.id && blockIds.includes(el.id)) {
      return false;
    }
 
    if(el.classList) {
      for(let clazz of blockClass) {
        if(el.classList.contains(clazz)) {
          return false;
        }
      }
    }
 
    return true;
  }
 
  function traverseElement(el) {
    if(!shoudTranslateEl(el)) {
      return
    }
 
    for(const child of el.childNodes) {
      if(["RELATIVE-TIME", "TIME-AGO"].includes(el.tagName)) {
        translateRelativeTimeEl(el);
        return;
      }
 
      if(child.nodeType === Node.TEXT_NODE) {
        translateElement(child);
      }
      else if(child.nodeType === Node.ELEMENT_NODE) {
        if(child.tagName === "INPUT") {
          translateElement(child);
        } else {
          traverseElement(child);
        }
      } else {
        // pass
      }
    }
  }
 
  function watchUpdate() {
    const m = window.MutationObserver || window.WebKitMutationObserver;
    const observer = new m(function (mutations, observer) {
      for(let mutationRecord of mutations) {
        for(let node of mutationRecord.addedNodes) {
          traverseElement(node);
        }
      }
    });
 
    observer.observe(document.body, {
      subtree: true,
      characterData: true,
      childList: true,
    });
  }
 
  // translate "about"
  function translateDesc() {
    $(".repository-content .f4").append("<br/>");
    $(".repository-content .f4").append("<a id='translate-me' href='#' style='color:rgb(27, 149, 224);font-size: small'>翻译</a>");
    $("#translate-me").click(function() {
      // get description text
      const desc = $(".repository-content .f4")
        .clone()
        .children()
        .remove()
        .end()
        .text()
        .trim();
 
      if(!desc) {
        return;
      }
 
      GM_xmlhttpRequest({
        method: "GET",
        url: `https://www.githubs.cn/translate?q=`+ encodeURIComponent(desc),
        onload: function(res) {
          if (res.status === 200) {
            $("#translate-me").hide();
            // render result
            const text = res.responseText;
            $(".repository-content .f4").append("<span style='font-size: small'>由 <a target='_blank' style='color:rgb(27, 149, 224);' href='https://www.githubs.cn'>GitHub中文社区</a> 翻译👇</span>");
            $(".repository-content .f4").append("<br/>");
            $(".repository-content .f4").append(text);
          } else {
            alert("翻译失败");
          }
        }
      });
    });
  }
 
  function translateByCssSelector() {
    if(locales.css) {
      for(var css of locales.css) {
        if($(css.selector).length > 0) {
          if(css.key === '!html') {
            $(css.selector).html(css.replacement);
          } else {
            $(css.selector).attr(css.key, css.replacement);
          }
        }
      }
    }
  }
})();
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