[UserScript] Extract and display user unique id in twitter

TwitterUserIDExtractor.js

{
// ==UserScript==
// @name		Twitter User ID Extractor
// @version		4
// @description	ユーザの固有IDを抽出します。
// @author		silver-mixer
// @match		https://twitter.com/*
// @grant		none
// ==/UserScript==
try{
	const USE_SCREEN_NAME = true;
	const WATCH_INTERVAL = 500;
	let lastPage = null;
	let success = false;
	let getScreenName = () => {
		let scrname = null;
		try{
			let spans = document.getElementsByTagName('nav')[1].previousSibling.children[1].children[1].querySelectorAll('span');
			for(let i = spans.length - 1; i > 0; i--){
				if(spans[i].innerText.indexOf('@') === 0)scrname = spans[i].innerText;
			}
		}catch(e){}
		return scrname;
	};
	let getDisplayName = () => {
		let display = null;
		try{
			let spans = document.getElementsByTagName('nav')[1].previousSibling.children[1].children[1].querySelectorAll('span');
			display = spans[0].innerText;
		}catch(e){}
		return display;
	};
	let addUidProfile = uid => {
		let name = location.href.match(/https:\/\/twitter\.com\/([a-zA-Z0-9_]+)/)[1];
		let spans = document.getElementsByTagName('span');
		let navs = document.getElementsByTagName('nav');
		if(navs.length > 1 && navs[1].previousSibling && navs[1].previousSibling.lastChild && document.getElementsByTagName('span')[8]){
			let aElem = document.createElement('a');
			aElem.href = 'https://twitter.com/intent/user?user_id=' + uid;
			if(USE_SCREEN_NAME){
				aElem.innerText = (getScreenName() !== null ? getScreenName() : name) + ' (' + uid + ')';
			}else{
				let display = (getDisplayName() !== null ? getDisplayName() : name);
				aElem.innerText = display + '(' + uid + ')';
			}
			aElem.id = '_tuie_a';
			navs[1].previousSibling.lastChild.appendChild(aElem);
			return true;
		}
		return false;
	};
	setInterval(() => {
		let page = location.href.match(/https:\/\/twitter\.com\/([a-zA-Z0-9_]+)/)[1];
		let followSpan = Array.prototype.find.call(document.getElementsByTagName('span'), elem => elem.innerHTML === 'フォロー中' || elem.innerHTML === 'フォロー');
		if(page !== lastPage){
			if(document.getElementById('_tuie_a')){
				document.getElementById('_tuie_a').remove();
			}
			success = false;
		}
		if(followSpan &&
				followSpan.parentNode &&
				followSpan.parentNode.parentNode &&
				followSpan.parentNode.parentNode.parentNode){
			let rawUid = followSpan.parentNode.parentNode.parentNode.dataset.testid;
			if(rawUid && rawUid.match(/[0-9]+/) !== null){
				let uid = rawUid.match(/[0-9]+/)[0];
				if(!success || document.getElementById('_tuie_a') === null){
					success = addUidProfile(uid);
				}
			}
		}
		lastPage = page;
	}, WATCH_INTERVAL);
}catch(e){
	console.error('Error at Twitter User ID Extractor v4\n', e);
}}

Twitter User ID Extractor

簡易バージョン履歴

v4 Tampermonkey向けにヘッダコメントを修正
v3 動作しないバグを修正
v2 現Twitter用に再作成
v1 旧Twitter用に作成(非公開)