Unity_Open_Japanese_Page.user.js

// ==UserScript==
// @name         Unity - Open Japanese Page
// @version      0.1
// @author       to
// @namespace    https://github.com/to
// @license      MIT
//
// @match        file:///C:/Program%20Files/Unity/Hub/Editor/*
// @match        https://docs.unity3d.com/*
// @icon         https://www.google.com/s2/favicons?sz=64&domain=unity3d.com
// 
// @grant        GM_openInTab
// @grant        GM_addStyle
// ==/UserScript==

GM_addStyle(`
a#switch-page.switch-link.gray-btn.sbtn.left{
	color : white !important;
}
`);

(() => {
  var href = location.href;
  if (/file:\/\//.test(href)) {
    let version = href.match(/Editor\/(\d{4}\.\d)/)[1];
    let path = href.match(/Manual\/(.+)/)[1];

    GM_openInTab(`https://docs.unity3d.com/ja/${version}/Manual/${path}`);
    return;
  }

  if (/\/(\d{4}.+?\/)Documentation\//.test(href)) {
    GM_openInTab(location.href.replace(/\/(\d{4}.+?\/)Documentation\//, '/ja/$1'));
    return;
  }

  if (/ScriptReference\//.test(href)) {
    var elmLink = document.querySelector('.switch-link.gray-btn.sbtn.left');
    elmLink.classList.remove('hide');

    elmLink.id = 'switch-page';
    elmLink.href = href.replace('ScriptReference/', 'Manual/class-');
    return;
  }

  if (/Manual\/(class|script)-/.test(href)) {
    var elmTitle = document.querySelector('.section h1');
    elmTitle.style.marginBottom = '0';

    var elmLink = document.createElement('a');
    elmTitle.after(elmLink);
    elmLink.textContent = 'スクリプトに切り替える';
    elmLink.className = 'switch-link gray-btn sbtn left';
    elmLink.style.marginBottom = '2em';

    elmLink.id = 'switch-page';

    if (/class-/.test(href)) {
      elmLink.href = href.replace('Manual/class-', 'ScriptReference/');
    } else {
      let name = href.match(/script-(.+)\.html/)[1];
      elmLink.href = `https://docs.unity3d.com/Packages/com.unity.ugui@1.0/api/UnityEngine.UI.${name}.html`;
    }
    return;
  }
})();