☰

SE Preview on hover

Shows preview of the linked questions/answers on hover

当前为 2017-03-03 提交的版本，查看 最新版本。

  1. // ==UserScript==
  2. // @name           SE Preview on hover
  3. // @description    Shows preview of the linked questions/answers on hover
  4. // @version        0.4.8
  5. // @author         wOxxOm
  6. // @namespace      wOxxOm.scripts
  7. // @license        MIT License
  8. // @match          *://*.stackoverflow.com/*
  9. // @match          *://*.superuser.com/*
  10. // @match          *://*.serverfault.com/*
  11. // @match          *://*.askubuntu.com/*
  12. // @match          *://*.stackapps.com/*
  13. // @match          *://*.mathoverflow.net/*
  14. // @match          *://*.stackexchange.com/*
  15. // @include        /https?:\/\/www\.?google(\.com?)?(\.\w\w)?\/(webhp|q|.*?[?#]q=|search).*/
  16. // @match          *://*.bing.com/*
  17. // @match          *://*.yahoo.com/*
  18. // @match          *://*.yahoo.co.jp/*
  19. // @match          *://*.yahoo.cn/*
  20. // @include        /https?:\/\/(\w+\.)*yahoo.(com|\w\w(\.\w\w)?)\/.*/
  21. // @require        https://gf.qytechs.cn/scripts/12228/code/setMutationHandler.js
  22. // @require        https://gf.qytechs.cn/scripts/27531/code/LZString-2xspeedup.js
  23. // @grant          GM_addStyle
  24. // @grant          GM_xmlhttpRequest
  25. // @grant          GM_getValue
  26. // @grant          GM_setValue
  27. // @connect        stackoverflow.com
  28. // @connect        superuser.com
  29. // @connect        serverfault.com
  30. // @connect        askubuntu.com
  31. // @connect        stackapps.com
  32. // @connect        mathoverflow.net
  33. // @connect        stackexchange.com
  34. // @connect        cdn.sstatic.net
  35. // @run-at         document-end
  36. // @noframes
  37. // ==/UserScript==
  38.  
  39. /* jshint lastsemic:true, multistr:true, laxbreak:true, -W030, -W041, -W084 */
  40.  
  41. const PREVIEW_DELAY = 200;
  42. const CACHE_DURATION = 1 * 60 * 1000; // 1 minute for the recently active posts, scales up logarithmically
  43. const MIN_HEIGHT = 400; // px
  44. const COLORS = {
  45. 	question: {
  46. 		backRGB: '80, 133, 195',
  47. 		fore: '#265184',
  48. 	},
  49. 	answer: {
  50. 		backRGB: '112, 195, 80',
  51. 		fore: '#3f7722',
  52. 		foreInv: 'white',
  53. 	},
  54. 	deleted: {
  55. 		backRGB: '181, 103, 103',
  56. 		fore: 'rgb(181, 103, 103)',
  57. 		foreInv: 'white',
  58. 	},
  59. 	closed: {
  60. 		backRGB: '255, 206, 93',
  61. 		fore: 'rgb(194, 136, 0)',
  62. 		foreInv: 'white',
  63. 	},
  64. };
  65.  
  66. let xhr;
  67. const xhrNoSSL = new Set();
  68. const preview = {
  69. 	frame: null,
  70. 	link: null,
  71. 	hover: {x:0, y:0},
  72. 	timer: 0,
  73. 	stylesOverride: '',
  74. };
  75. const lockScroll = {};
  76.  
  77. const {full: rxPreviewable, siteOnly: rxPreviewableSite} = getURLregexForMatchedSites();
  78. const thisPageUrls = getPageBaseUrls(location.href);
  79.  
  80. initStyles();
  81. initPolyfills();
  82. setMutationHandler('a', onLinkAdded, {processExisting: true});
  83. setTimeout(cleanupCache, 10000);
  84.  
  85. /**************************************************************/
  86.  
  87. function onLinkAdded(links) {
  88. 	for (let i = 0, link; (link = links[i++]); ) {
  89. 		if (isLinkPreviewable(link)) {
  90. 			link.removeAttribute('title');
  91. 			$on('mouseover', link, onLinkHovered);
  92. 		}
  93. 	}
  94. }
  95.  
  96. function onLinkHovered(e) {
  97. 	if (hasKeyModifiers(e) || !document.hasFocus())
  98. 		return;
  99. 	preview.link = this;
  100. 	$on('mousemove', this, onLinkMouseMove);
  101. 	$on('mouseout', this, abortPreview);
  102. 	$on('mousedown', this, abortPreview);
  103. 	restartPreviewTimer(this);
  104. }
  105.  
  106. function onLinkMouseMove(e) {
  107. 	let stoppedMoving = Math.abs(preview.hover.x - e.clientX) < 2 &&
  108. 		Math.abs(preview.hover.y - e.clientY) < 2;
  109. 	if (!stoppedMoving)
  110. 		return;
  111. 	preview.hover.x = e.clientX;
  112. 	preview.hover.y = e.clientY;
  113. 	restartPreviewTimer(this);
  114. }
  115.  
  116. function restartPreviewTimer(link) {
  117. 	clearTimeout(preview.timer);
  118. 	preview.timer = setTimeout(() => {
  119. 		preview.timer = 0;
  120. 		$off('mousemove', link, onLinkMouseMove);
  121. 		if (link.matches(':hover'))
  122. 			downloadPreview(link);
  123. 	}, PREVIEW_DELAY);
  124. }
  125.  
  126. function abortPreview(e) {
  127. 	releaseLinkListeners(this);
  128. 	preview.timer = setTimeout(link => {
  129. 		if (link == preview.link && preview.frame && !preview.frame.matches(':hover'))
  130. 			preview.frame.contentWindow.postMessage('SEpreview-hidden', '*');
  131. 	}, PREVIEW_DELAY * 3, this);
  132. 	if (xhr)
  133. 		xhr.abort();
  134. }
  135.  
  136. function releaseLinkListeners(link = preview.link) {
  137. 	$off('mousemove', link, onLinkMouseMove);
  138. 	$off('mouseout', link, abortPreview);
  139. 	$off('mousedown', link, abortPreview);
  140. 	clearTimeout(preview.timer);
  141. }
  142.  
  143. function fadeOut(element, transition) {
  144. 	return new Promise(resolve => {
  145. 		if (transition) {
  146. 			element.style.transition = typeof transition == 'number' ? `opacity ${transition}s ease-in-out` : transition;
  147. 			setTimeout(doFadeOut);
  148. 		} else
  149. 			doFadeOut();
  150.  
  151. 		function doFadeOut() {
  152. 			element.style.opacity = '0';
  153. 			$on('transitionend', element, function done() {
  154. 				$off('transitionend', element, done);
  155. 				if (element.style.opacity == '0')
  156. 					element.style.display = 'none';
  157. 				resolve();
  158. 			});
  159. 		}
  160. 	});
  161. }
  162.  
  163. function fadeIn(element) {
  164. 	element.style.opacity = '0';
  165. 	element.style.display = 'block';
  166. 	setTimeout(() => element.style.opacity = '1');
  167. }
  168.  
  169. function downloadPreview(link) {
  170. 	const cached = readCache(link.href);
  171. 	if (cached)
  172. 		return showPreview(cached);
  173. 	doXHR({url: httpsUrl(link.href)}).then(r => {
  174. 		const html = r.responseText;
  175. 		const lastActivity = link.matches(':hover') ? +showPreview({finalUrl: r.finalUrl, html}) : Date.now();
  176. 		if (!lastActivity)
  177. 			return;
  178. 		const inactiveDays = Math.max(0, (Date.now() - lastActivity) / (24 * 3600 * 1000));
  179. 		const cacheDuration = CACHE_DURATION * Math.pow(Math.log(inactiveDays + 1) + 1, 2);
  180. 		setTimeout(writeCache, 1000, {url: link.href, finalUrl: r.finalUrl, html, cacheDuration});
  181. 	});
  182. }
  183.  
  184. function initPreview() {
  185. 	preview.frame = document.createElement('iframe');
  186. 	preview.frame.id = 'SEpreview';
  187. 	document.body.appendChild(preview.frame);
  188. 	makeResizable();
  189.  
  190. 	lockScroll.attach = e => {
  191. 		if (lockScroll.pos)
  192. 			return;
  193. 		lockScroll.pos = {x: scrollX, y: scrollY};
  194. 		$on('scroll', document, lockScroll.run);
  195. 		$on('mouseover', document, lockScroll.detach);
  196. 	};
  197. 	lockScroll.run = e => scrollTo(lockScroll.pos.x, lockScroll.pos.y);
  198. 	lockScroll.detach = e => {
  199. 		if (!lockScroll.pos)
  200. 			return;
  201. 		lockScroll.pos = null;
  202. 		$off('mouseover', document, lockScroll.detach);
  203. 		$off('scroll', document, lockScroll.run);
  204. 	};
  205.  
  206. 	const killer = mutations => mutations.forEach(m => [...m.addedNodes].forEach(n => n.remove()));
  207. 	const killerMO = {
  208. 		head: new MutationObserver(killer),
  209. 		documentElement: new MutationObserver(killer),
  210. 	};
  211. 	preview.killInvaders = {
  212. 		start: () => Object.keys(killerMO).forEach(k => killerMO[k].observe(preview.frame.contentDocument[k], {childList: true})),
  213. 		stop: () => Object.keys(killerMO).forEach(k => killerMO[k].disconnect()),
  214. 	};
  215. }
  216.  
  217. function showPreview({finalUrl, html, doc}) {
  218. 	doc = doc || new DOMParser().parseFromString(html, 'text/html');
  219. 	if (!doc || !doc.head)
  220. 		return error('no HEAD in the document received for', finalUrl);
  221.  
  222. 	if (!$('base', doc))
  223. 		doc.head.insertAdjacentHTML('afterbegin', `<base href="${finalUrl}">`);
  224.  
  225. 	const answerIdMatch = finalUrl.match(/questions\/\d+\/[^\/]+\/(\d+)/);
  226. 	const isQuestion = !answerIdMatch;
  227. 	const postId = answerIdMatch ? '#answer-' + answerIdMatch[1] : '#question';
  228. 	const post = $(postId + ' .post-text', doc);
  229. 	if (!post)
  230. 		return error('No parsable post found', doc);
  231. 	const isDeleted = !!post.closest('.deleted-answer');
  232. 	const title = $('meta[property="og:title"]', doc).content;
  233. 	const status = isQuestion && !$('.question-status', post) ? $('.question-status', doc) : null;
  234. 	const isClosed = $('.question-originals-of-duplicate, .close-as-off-topic-status-list, .close-status-suffix', doc);
  235. 	const comments = $(`${postId} .comments`, doc);
  236. 	const commentsHidden = +$('tbody', comments).dataset.remainingCommentsCount;
  237. 	const commentsShowLink = commentsHidden && $(`${postId} .js-show-link.comments-link`, doc);
  238. 	const finalUrlOfQuestion = getCacheableUrl(finalUrl);
  239. 	const lastActivity = tryCatch(() => new Date($('.lastactivity-link', doc).title).getTime()) || Date.now();
  240.  
  241. 	markPreviewableLinks(doc);
  242. 	$$remove('script', doc);
  243.  
  244. 	if (!preview.frame)
  245. 		initPreview();
  246.  
  247. 	let pvDoc, pvWin;
  248. 	preview.frame.style.display = '';
  249. 	preview.frame.setAttribute('SEpreview-type',
  250. 		isDeleted ? 'deleted' : isQuestion ? (isClosed ? 'closed' : 'question') : 'answer');
  251. 	onFrameReady(preview.frame).then(
  252. 		() => {
  253. 			pvDoc = preview.frame.contentDocument;
  254. 			pvWin = preview.frame.contentWindow;
  255. 			initPolyfills(pvWin);
  256. 			preview.killInvaders.stop();
  257. 		})
  258. 		.then(addStyles)
  259. 		.then(render)
  260. 		.then(show);
  261. 	return lastActivity;
  262.  
  263. 	function markPreviewableLinks(container) {
  264. 		for (let link of $$('a:not(.SEpreviewable)', container)) {
  265. 			if (rxPreviewable.test(link.href)) {
  266. 				link.removeAttribute('title');
  267. 				link.classList.add('SEpreviewable');
  268. 			}
  269. 		}
  270. 	}
  271.  
  272. 	function markHoverableUsers(container) {
  273. 		for (let link of $$('a[href*="/users/"]', container)) {
  274. 			if (rxPreviewableSite.test(link.href) && link.pathname.match(/^\/users\/\d+/)) {
  275. 				link.onmouseover = loadUserCard;
  276. 				link.classList.add('SEpreview-userLink');
  277. 			}
  278. 		}
  279. 	}
  280.  
  281. 	function addStyles() {
  282. 		const SEpreviewStyles = $replaceOrCreate({
  283.     		id: 'SEpreviewStyles',
  284. 			tag: 'style', parent: pvDoc.head, className: 'SEpreview-reuse',
  285. 			innerHTML: preview.stylesOverride,
  286. 		});
  287. 		$replaceOrCreate($$('style', doc).map(e => ({
  288. 			id: 'SEpreview' + e.innerHTML.replace(/\W+/g, '').length,
  289. 			tag: 'style', before: SEpreviewStyles, className: 'SEpreview-reuse',
  290. 			innerHTML: e.innerHTML,
  291. 		})));
  292. 		return Promise.all(
  293. 			$$('link[rel="stylesheet"]', doc).map(e => {
  294. 				const id = e.href.replace(/\W+/g, '');
  295. 				if ($$('#' + id, pvDoc).some(e => e.className = 'SEpreview-reuse'))
  296. 					return;
  297. 				return new Promise(resolve => {
  298. 					doXHR({url: e.href}).then(() => {
  299. 						const sheet = $replaceOrCreate({
  300. 							id, tag: 'link', before: SEpreviewStyles, className: 'SEpreview-reuse',
  301. 							href: e.href, rel: 'stylesheet',
  302. 						});
  303. 						const timeout = setTimeout(() => { sheet.onload = null; resolve() }, 100);
  304. 						sheet.onload = () => {
  305. 							sheet.onload = null;
  306. 							clearTimeout(timeout);
  307. 							resolve();
  308. 						};
  309. 					});
  310. 				});
  311. 			})
  312. 		);
  313. 	}
  314.  
  315. 	function render() {
  316. 		pvDoc.body.setAttribute('SEpreview-type', preview.frame.getAttribute('SEpreview-type'));
  317.  
  318. 		$replaceOrCreate([{
  319. 		// base
  320. 			id: 'SEpreview-base', tag: 'base',
  321. 			parent: pvDoc.head,
  322.             href: $('base', doc).href,
  323. 		}, {
  324. 		// title
  325. 			id: 'SEpreview-title', tag: 'a',
  326. 			parent: pvDoc.body, className: 'SEpreviewable',
  327. 			href: finalUrlOfQuestion,
  328. 			textContent: title,
  329. 		}, {
  330. 		// close button
  331. 			id: 'SEpreview-close',
  332. 			parent: pvDoc.body,
  333. 			title: 'Or press Esc key while the preview is focused (also when just shown)',
  334. 		}, {
  335. 		// vote count, date, views#
  336. 			id: 'SEpreview-meta',
  337. 			parent: pvDoc.body,
  338. 			innerHTML: [
  339. 				$text('.vote-count-post', post.closest('table')).replace(/(-?)(\d+)/,
  340. 					(s, sign, v) => s == '0' ? '' : `<b>${s}</b> vote${+v > 1 ? 's' : ''}, `),
  341. 				isQuestion
  342. 					? $$('#qinfo tr', doc)
  343. 						.map(row => $$('.label-key', row).map($text).join(' '))
  344. 						.join(', ').replace(/^((.+?) (.+?), .+?), .+? \3$/, '$1')
  345. 					: [...$$('.user-action-time', post.closest('.answer'))]
  346. 						.reverse().map($text).join(', ')
  347. 			].join('')
  348. 		}, {
  349. 		// content wrapper
  350. 			id: 'SEpreview-body',
  351. 			parent: pvDoc.body,
  352. 			className: isDeleted ? 'deleted-answer' : '',
  353. 			children: [status, post.parentElement, comments, commentsShowLink],
  354. 		}]);
  355.  
  356. 		// delinkify/remove non-functional items in post-menu
  357. 		$$remove('.short-link, .flag-post-link', pvDoc);
  358. 		$$('.post-menu a:not(.edit-post)', pvDoc).forEach(a => {
  359. 			if (a.children.length)
  360. 				a.outerHTML = `<span>${a.innerHTML}</span>`;
  361. 			else
  362. 				a.remove();
  363. 		});
  364.  
  365. 		// add a timeline link
  366. 		if (isQuestion)
  367. 			$('.post-menu', pvDoc).insertAdjacentHTML('beforeend',
  368. 				'<span class="lsep">|</span>' +
  369. 				`<a href="/posts/${new URL(finalUrl).pathname.match(/\d+/)[0]}/timeline">timeline</a>`);
  370.  
  371. 		// prettify code blocks
  372. 		const codeBlocks = $$('pre code', pvDoc);
  373. 		if (codeBlocks.length) {
  374. 			codeBlocks.forEach(e => e.parentElement.classList.add('prettyprint'));
  375. 			if (!pvWin.StackExchange) {
  376. 				pvWin.StackExchange = {};
  377. 				let script = $scriptIn(pvDoc.head);
  378. 				script.text = 'StackExchange = {}';
  379. 				script = $scriptIn(pvDoc.head);
  380. 				script.src = 'https://cdn.sstatic.net/Js/prettify-full.en.js';
  381. 				script.setAttribute('onload', 'prettyPrint()');
  382. 			} else
  383. 				$scriptIn(pvDoc.body).text = 'prettyPrint()';
  384. 		}
  385.  
  386. 		// render bottom shelf
  387. 		const answers = $$('.answer', doc);
  388. 		if (answers.length > (isQuestion ? 0 : 1)) {
  389. 			$replaceOrCreate({
  390. 				id: 'SEpreview-answers',
  391. 				parent: pvDoc.body,
  392. 				innerHTML: answers.map(renderShelfAnswer).join(' '),
  393. 			});
  394. 		} else
  395. 			$$remove('#SEpreview-answers', pvDoc);
  396.  
  397. 		// cleanup leftovers from previously displayed post and foreign elements not injected by us
  398. 		$$('style, link, body script, html > *:not(head):not(body), .post-menu .lsep + .lsep', pvDoc).forEach(e => {
  399. 			if (e.classList.contains('SEpreview-reuse'))
  400. 				e.classList.remove('SEpreview-reuse');
  401. 			else
  402. 				e.remove();
  403. 		});
  404. 	}
  405.  
  406. 	function renderShelfAnswer(e) {
  407. 		const shortUrl = $('.short-link', e).href.replace(/(\d+)\/\d+/, '$1');
  408. 		const extraClasses = (e.matches(postId) ? ' SEpreviewed' : '') +
  409. 		      (e.matches('.deleted-answer') ? ' deleted-answer' : '') +
  410. 			  ($('.vote-accepted-on', e) ? ' SEpreview-accepted' : '');
  411. 		const author = $('.post-signature:last-child', e);
  412. 		const title = $text('.user-details a', author) + ' (rep ' +
  413. 			  $text('.reputation-score', author) + ')\n' +
  414. 			  $text('.user-action-time', author);
  415. 		const gravatar = $('img, .anonymous-gravatar, .community-wiki', author);
  416. 		return (
  417. 			`<a href="${shortUrl}" title="${title}" class="SEpreviewable${extraClasses}">` +
  418. 				$text('.vote-count-post', e).replace(/^0$/, '&nbsp;') + ' ' +
  419. 				(!gravatar ? '' : gravatar.src ? `<img src="${gravatar.src}">` : gravatar.outerHTML) +
  420. 			'</a>');
  421. 	}
  422.  
  423. 	function show() {
  424. 		pvDoc.onmouseover = lockScroll.attach;
  425. 		pvDoc.onclick = onClick;
  426. 		pvDoc.onkeydown = e => !hasKeyModifiers(e) && e.keyCode == 27 ? hide() : null;
  427. 		pvWin.onmessage = e => e.data == 'SEpreview-hidden' ? hide({fade: true}) : null;
  428.  
  429. 		markHoverableUsers(pvDoc);
  430. 		preview.killInvaders.start();
  431.  
  432. 		$('#SEpreview-body', pvDoc).scrollTop = 0;
  433. 		preview.frame.style.opacity = '1';
  434. 		preview.frame.focus();
  435. 	}
  436.  
  437. 	function hide({fade = false} = {}) {
  438. 		releaseLinkListeners();
  439. 		releasePreviewListeners();
  440. 		const maybeZap = () => preview.frame.style.opacity == '0' && $removeChildren(pvDoc.body);
  441. 		if (fade)
  442. 			fadeOut(preview.frame).then(maybeZap);
  443. 		else {
  444. 			preview.frame.style.opacity = '0';
  445. 			preview.frame.style.display = 'none';
  446. 			maybeZap();
  447. 		}
  448. 	}
  449.  
  450. 	function releasePreviewListeners(e) {
  451. 		pvWin.onmessage = null;
  452. 		pvDoc.onmouseover = null;
  453. 		pvDoc.onclick = null;
  454. 		pvDoc.onkeydown = null;
  455. 	}
  456.  
  457. 	function onClick(e) {
  458. 		if (e.target.id == 'SEpreview-close')
  459. 			return hide();
  460.  
  461. 		const link = e.target.closest('a');
  462. 		if (!link)
  463. 			return;
  464.  
  465. 		if (link.matches('.js-show-link.comments-link')) {
  466. 			fadeOut(link, 0.5);
  467. 			loadComments();
  468. 			return e.preventDefault();
  469. 		}
  470.  
  471. 		if (e.button || hasKeyModifiers(e) || !link.matches('.SEpreviewable'))
  472. 			return (link.target = '_blank');
  473.  
  474. 		e.preventDefault();
  475.  
  476. 		if (link.id == 'SEpreview-title')
  477. 			showPreview({doc, finalUrl: finalUrlOfQuestion});
  478. 		else if (link.matches('#SEpreview-answers a'))
  479. 			showPreview({doc, finalUrl: finalUrlOfQuestion + '/' + link.pathname.match(/\/(\d+)/)[1]});
  480. 		else
  481. 			downloadPreview(link);
  482. 	}
  483.  
  484. 	function loadComments() {
  485. 		const url = new URL(finalUrl).origin + '/posts/' + comments.id.match(/\d+/)[0] + '/comments';
  486. 		doXHR({url}).then(r => {
  487. 			const tbody = $(`#${comments.id} tbody`, pvDoc);
  488. 			const oldIds = new Set([...tbody.rows].map(e => e.id));
  489. 			tbody.innerHTML = r.responseText;
  490. 			tbody.closest('.comments').style.display = 'block';
  491. 			for (let tr of tbody.rows)
  492. 				if (!oldIds.has(tr.id))
  493. 					tr.classList.add('new-comment-highlight');
  494. 			markPreviewableLinks(tbody);
  495. 			markHoverableUsers(tbody);
  496. 		});
  497. 	}
  498.  
  499. 	function loadUserCard(e, ready) {
  500. 		if (ready !== true)
  501. 			return setTimeout(loadUserCard, PREVIEW_DELAY * 2, e, true);
  502. 		const link = e.target.closest('a');
  503. 		if (!link.matches(':hover'))
  504. 			return;
  505. 		let timer;
  506. 		let userCard = link.nextElementSibling;
  507. 		if (userCard && userCard.matches('.SEpreview-userCard'))
  508. 			return fadeInUserCard();
  509. 		const url = link.origin + '/users/user-info/' + link.pathname.match(/\d+/)[0];
  510.  
  511. 		Promise.resolve(
  512. 			readCache(url) ||
  513. 			doXHR({url}).then(r => {
  514. 				writeCache({url, html: r.responseText, cacheDuration: CACHE_DURATION * 100});
  515. 				return {html: r.responseText};
  516. 			})
  517. 		).then(renderUserCard);
  518.  
  519. 		function renderUserCard({html}) {
  520. 			const linkBounds = link.getBoundingClientRect();
  521. 			const wrapperBounds = $('#SEpreview-body', pvDoc).getBoundingClientRect();
  522. 			userCard = $replaceOrCreate({id: 'user-menu-tmp', className: 'SEpreview-userCard', innerHTML: html, after: link});
  523. 			userCard.style.left = Math.min(linkBounds.left - 20, pvWin.innerWidth - 350) + 'px';
  524. 			if (linkBounds.bottom + 100 > wrapperBounds.bottom)
  525. 				userCard.style.marginTop = '-5rem';
  526. 			userCard.onmouseout = e => {
  527. 				if (e.target != userCard || userCard.contains(e.relatedTarget))
  528. 					if (e.relatedTarget) // null if mouse is outside the preview
  529. 						return;
  530. 				fadeOut(userCard);
  531. 				clearTimeout(timer);
  532. 				timer = 0;
  533. 			};
  534. 			fadeInUserCard();
  535. 		}
  536.  
  537. 		function fadeInUserCard() {
  538. 			if (userCard.id != 'user-menu') {
  539. 				$$('#user-menu', pvDoc).forEach(e => e.id = e.style.display = '' );
  540. 				userCard.id = 'user-menu';
  541. 			}
  542. 			userCard.style.opacity = '0';
  543. 			userCard.style.display = 'block';
  544. 			timer = setTimeout(() => timer && (userCard.style.opacity = '1'));
  545. 		}
  546. 	}
  547. }
  548.  
  549. function getCacheableUrl(url) {
  550. 	// strips queries and hashes and anything after the main part https://site/questions/####/title/
  551. 	return url
  552. 		.replace(/(\/q(?:uestions)?\/\d+\/[^\/]+).*/, '$1')
  553. 		.replace(/(\/a(?:nswers)?\/\d+).*/, '$1')
  554. 		.replace(/[?#].*$/, '');
  555. }
  556.  
  557. function readCache(url) {
  558. 	keyUrl = getCacheableUrl(url);
  559. 	const meta = (localStorage[keyUrl] || '').split('\t');
  560. 	const expired = +meta[0] < Date.now();
  561. 	const finalUrl = meta[1] || url;
  562. 	const keyFinalUrl = meta[1] ? getCacheableUrl(finalUrl) : keyUrl;
  563. 	return !expired && {
  564. 		finalUrl,
  565. 		html: LZString.decompressFromUTF16(localStorage[keyFinalUrl + '\thtml']),
  566. 	};
  567. }
  568.  
  569. function writeCache({url, finalUrl, html, cacheDuration = CACHE_DURATION, cleanupRetry}) {
  570. 	// keyUrl=expires
  571. 	// redirected keyUrl=expires+finalUrl, and an additional entry keyFinalUrl=expires is created
  572. 	// keyFinalUrl\thtml=html
  573. 	cacheDuration = Math.max(CACHE_DURATION, Math.min(0xDEADBEEF, Math.floor(cacheDuration)));
  574. 	finalUrl = (finalUrl || url).replace(/[?#].*/, '');
  575. 	const keyUrl = getCacheableUrl(url);
  576. 	const keyFinalUrl = getCacheableUrl(finalUrl);
  577. 	const expires = Date.now() + cacheDuration;
  578. 	const lz = LZString.compressToUTF16(html);
  579. 	if (!tryCatch(() => localStorage[keyFinalUrl + '\thtml'] = lz)) {
  580. 		if (cleanupRetry)
  581. 			return error('localStorage write error');
  582. 		cleanupCache({aggressive: true});
  583. 		setIimeout(writeCache, 0, {url, finalUrl, html, cacheDuration, cleanupRetry: true});
  584. 	}
  585. 	localStorage[keyFinalUrl] = expires;
  586. 	if (keyUrl != keyFinalUrl)
  587. 		localStorage[keyUrl] = expires + '\t' + finalUrl;
  588. 	setTimeout(() => {
  589. 		[keyUrl, keyFinalUrl, keyFinalUrl + '\thtml'].forEach(e => localStorage.removeItem(e));
  590. 	}, cacheDuration + 1000);
  591. }
  592.  
  593. function cleanupCache({aggressive = false} = {}) {
  594. 	Object.keys(localStorage).forEach(k => {
  595. 		if (k.match(/^https?:\/\/[^\t]+$/)) {
  596. 			let meta = (localStorage[k] || '').split('\t');
  597. 			if (+meta[0] > Date.now() && !aggressive)
  598. 				return;
  599. 			if (meta[1])
  600. 				localStorage.removeItem(meta[1]);
  601. 			localStorage.removeItem(`${meta[1] || k}\thtml`);
  602. 			localStorage.removeItem(k);
  603. 		}
  604. 	});
  605. }
  606.  
  607. function onFrameReady(frame) {
  608. 	if (frame.contentDocument.readyState == 'complete')
  609. 		return Promise.resolve();
  610. 	else
  611. 		return new Promise(resolve => {
  612. 			$on('load', frame, function onLoad() {
  613. 				$off('load', frame, onLoad);
  614. 				resolve();
  615. 			});
  616. 		});
  617. }
  618.  
  619. function onStyleSheetsReady(linkElements) {
  620. 	let retryCount = 0;
  621. 	return new Promise(function retry(resolve) {
  622. 		if (linkElements.every(e => e.sheet && e.sheet.href == e.href))
  623. 			resolve();
  624. 		else if (retryCount++ > 10)
  625. 			resolve();
  626. 		else
  627. 			setTimeout(retry, 0, resolve);
  628. 	});
  629. }
  630.  
  631. function getURLregexForMatchedSites() {
  632. 	const sites = 'https?://(\\w*\\.)*(' + GM_info.script.matches.map(
  633. 		m => m.match(/^.*?\/\/\W*(\w.*?)\//)[1].replace(/\./g, '\\.')).join('|') + ')/';
  634. 	return {
  635. 		full: new RegExp(sites + '(questions|q|a|posts\/comments)/\\d+'),
  636. 		siteOnly: new RegExp(sites),
  637. 	};
  638. }
  639.  
  640. function isLinkPreviewable(link) {
  641. 	if (!rxPreviewable.test(link.href) || link.matches('.short-link'))
  642. 		return false;
  643. 	const inPreview = preview.frame && link.ownerDocument == preview.frame.contentDocument;
  644. 	const pageUrls = inPreview ? getPageBaseUrls(preview.link.href) : thisPageUrls;
  645. 	const url = httpsUrl(link.href);
  646. 	return url.indexOf(pageUrls.base) &&
  647. 		   url.indexOf(pageUrls.short);
  648. }
  649.  
  650. function getPageBaseUrls(url) {
  651. 	const base = httpsUrl((url.match(rxPreviewable) || [])[0]);
  652. 	return base ? {
  653. 		base,
  654. 		short: base.replace('/questions/', '/q/'),
  655. 	} : {};
  656. }
  657.  
  658. function httpsUrl(url) {
  659. 	return (url || '').replace(/^http:/, 'https:');
  660. }
  661.  
  662. function doXHR(options) {
  663. 	options = Object.assign({method: 'GET'}, options);
  664. 	const useHttpUrl = () => options.url = options.url.replace(/^https/, 'http');
  665. 	const hostname = new URL(options.url).hostname;
  666. 	if (xhrNoSSL.has(hostname))
  667. 		useHttpUrl();
  668. 	else if (options.url.startsWith('https')) {
  669. 		options.onerror = e => {
  670. 			useHttpUrl();
  671. 			xhrNoSSL.add(hostname);
  672. 			xhr = GM_xmlhttpRequest(options);
  673. 		};
  674. 	}
  675. 	if (options.onload)
  676. 		return (xhr = GM_xmlhttpRequest(options));
  677. 	else
  678. 		return new Promise(resolve => {
  679. 			xhr = GM_xmlhttpRequest(Object.assign(options, {onload: resolve}));
  680. 		});
  681. }
  682.  
  683. function makeResizable() {
  684. 	let heightOnClick;
  685. 	const pvDoc = preview.frame.contentDocument;
  686. 	const topBorderHeight = (preview.frame.offsetHeight - preview.frame.clientHeight) / 2;
  687. 	setHeight(GM_getValue('height', innerHeight / 3) |0);
  688.  
  689. 	// mouseover in the main page is fired only on the border of the iframe
  690. 	$on('mouseover', preview.frame, onOverAttach);
  691. 	$on('message', preview.frame.contentWindow, e => {
  692. 		if (e.data != 'SEpreview-hidden')
  693. 			return;
  694. 		if (heightOnClick) {
  695. 			releaseResizeListeners();
  696. 			setHeight(heightOnClick);
  697. 		}
  698. 		if (preview.frame.style.cursor)
  699. 			onOutDetach();
  700. 	});
  701.  
  702. 	function setCursorStyle(e) {
  703. 		return (preview.frame.style.cursor = e.offsetY <= 0 ? 's-resize' : '');
  704. 	}
  705.  
  706. 	function onOverAttach(e) {
  707. 		setCursorStyle(e);
  708. 		$on('mouseout', preview.frame, onOutDetach);
  709. 		$on('mousemove', preview.frame, setCursorStyle);
  710. 		$on('mousedown', onDownStartResize);
  711. 	}
  712.  
  713. 	function onOutDetach(e) {
  714. 		if (!e || !e.relatedTarget || !pvDoc.contains(e.relatedTarget)) {
  715. 			$off('mouseout', preview.frame, onOutDetach);
  716. 			$off('mousemove', preview.frame, setCursorStyle);
  717. 			$off('mousedown', onDownStartResize);
  718. 			preview.frame.style.cursor = '';
  719. 		}
  720. 	}
  721.  
  722. 	function onDownStartResize(e) {
  723. 		if (!preview.frame.style.cursor)
  724. 			return;
  725. 		heightOnClick = preview.frame.clientHeight;
  726.  
  727. 		$off('mouseover', preview.frame, onOverAttach);
  728. 		$off('mousemove', preview.frame, setCursorStyle);
  729. 		$off('mouseout', preview.frame, onOutDetach);
  730.  
  731. 		document.documentElement.style.cursor = 's-resize';
  732. 		document.body.style.cssText += ';pointer-events: none!important';
  733. 		$on('mousemove', onMoveResize);
  734. 		$on('mouseup',  onUpConfirm);
  735. 	}
  736.  
  737. 	function onMoveResize(e) {
  738. 		setHeight(innerHeight - topBorderHeight - e.clientY);
  739. 		getSelection().removeAllRanges();
  740. 		preview.frame.contentWindow.getSelection().removeAllRanges();
  741. 	}
  742.  
  743. 	function onUpConfirm(e) {
  744. 		GM_setValue('height', pvDoc.body.clientHeight);
  745. 		releaseResizeListeners(e);
  746. 	}
  747.  
  748. 	function releaseResizeListeners() {
  749. 		$off('mouseup', releaseResizeListeners);
  750. 		$off('mousemove', onMoveResize);
  751.  
  752. 		$on('mouseover', preview.frame, onOverAttach);
  753. 		onOverAttach({});
  754.  
  755. 		document.body.style.pointerEvents = '';
  756. 		document.documentElement.style.cursor = '';
  757. 		heightOnClick = 0;
  758. 	}
  759. }
  760.  
  761. function setHeight(height) {
  762. 	const currentHeight = preview.frame.clientHeight;
  763. 	const borderHeight = preview.frame.offsetHeight - currentHeight;
  764. 	const newHeight = Math.max(MIN_HEIGHT, Math.min(innerHeight - borderHeight, height));
  765. 	if (newHeight != currentHeight)
  766. 		preview.frame.style.height = newHeight + 'px';
  767. }
  768.  
  769. function $(selector, node = document) {
  770. 	return node.querySelector(selector);
  771. }
  772.  
  773. function $$(selector, node = document) {
  774. 	return node.querySelectorAll(selector);
  775. }
  776.  
  777. function $text(selector, node = document) {
  778. 	const e = typeof selector == 'string' ? node.querySelector(selector) : selector;
  779. 	return e ? e.textContent.trim() : '';
  780. }
  781.  
  782. function $$remove(selector, node = document) {
  783. 	node.querySelectorAll(selector).forEach(e => e.remove());
  784. }
  785.  
  786. function $appendChildren(newParent, elements) {
  787. 	const doc = newParent.ownerDocument;
  788. 	const fragment = doc.createDocumentFragment();
  789. 	for (let e of elements)
  790. 		if (e)
  791. 		   fragment.appendChild(e.ownerDocument == doc ? e : doc.importNode(e, true));
  792. 	newParent.appendChild(fragment);
  793. }
  794.  
  795. function $removeChildren(el) {
  796. 	if (el.children.length)
  797. 		el.innerHTML = ''; // the fastest as per https://jsperf.com/innerhtml-vs-removechild/256
  798. }
  799.  
  800. function $replaceOrCreate(options) {
  801. 	if (typeof options.map == 'function')
  802. 		return options.map($replaceOrCreate);
  803.     const doc = (options.parent || options.before || options.after).ownerDocument;
  804. 	const el = doc.getElementById(options.id) || doc.createElement(options.tag || 'div');
  805. 	for (let key of Object.keys(options)) {
  806. 		const value = options[key];
  807. 		switch (key) {
  808. 			case 'tag':
  809. 			case 'parent':
  810. 			case 'before':
  811. 			case 'after':
  812. 				break;
  813. 			case 'dataset':
  814. 				for (let dataAttr of Object.keys(value))
  815. 					if (el.dataset[dataAttr] != value[dataAttr])
  816. 						el.dataset[dataAttr] = value[dataAttr];
  817. 				break;
  818. 			case 'children':
  819. 				$removeChildren(el);
  820. 				$appendChildren(el, options[key]);
  821. 				break;
  822. 			default:
  823. 				if (key in el && el[key] != value)
  824. 					el[key] = value;
  825. 		}
  826. 	}
  827. 	if (!el.parentElement)
  828.     	(options.parent || (options.before || options.after).parentElement)
  829. 			.insertBefore(el, options.before || (options.after && options.after.nextElementSibling));
  830. 	return el;
  831. }
  832.  
  833. function $scriptIn(element) {
  834. 	return element.appendChild(element.ownerDocument.createElement('script'));
  835. }
  836.  
  837. function $on(eventName, ...args) {
  838. // eventName, selector, node, callback, options
  839. // eventName, selector, callback, options
  840. // eventName, node, callback, options
  841. // eventName, callback, options
  842. 	let i = 0;
  843. 	const selector = typeof args[i] == 'string' ? args[i++] : null;
  844. 	const node = args[i].nodeType ? args[i++] : document;
  845. 	const callback = args[i++];
  846. 	const options = args[i];
  847.  
  848. 	const actualNode = selector ? node.querySelector(selector) : node;
  849. 	const method = this == 'removeEventListener' ? this : 'addEventListener';
  850. 	actualNode[method](eventName, callback, options);
  851. }
  852.  
  853. function $off() {
  854. 	$on.apply('removeEventListener', arguments);
  855. }
  856.  
  857. function hasKeyModifiers(e) {
  858. 	return e.ctrlKey || e.altKey || e.shiftKey || e.metaKey;
  859. }
  860.  
  861. function log(...args) {
  862. 	console.log(GM_info.script.name, ...args);
  863. }
  864.  
  865. function error(...args) {
  866. 	console.error(GM_info.script.name, ...args);
  867. }
  868.  
  869. function tryCatch(fn) {
  870. 	try { return fn() }
  871. 	catch(e) {}
  872. }
  873.  
  874. function initPolyfills(context = window) {
  875. 	for (let method of ['forEach', 'filter', 'map', 'every', 'some', context.Symbol.iterator])
  876. 		if (!context.NodeList.prototype[method])
  877. 			context.NodeList.prototype[method] = context.Array.prototype[method];
  878. }
  879.  
  880. function initStyles() {
  881. 	GM_addStyle(`
  882. 		#SEpreview {
  883. 			all: unset;
  884. 			box-sizing: content-box;
  885. 			width: 720px; /* 660px + 30px + 30px */
  886. 			height: 33%;
  887. 			min-height: ${MIN_HEIGHT}px;
  888. 			position: fixed;
  889. 			opacity: 0;
  890. 			transition: opacity .25s cubic-bezier(.88,.02,.92,.66);
  891. 			right: 0;
  892. 			bottom: 0;
  893. 			padding: 0;
  894. 			margin: 0;
  895. 			background: white;
  896. 			box-shadow: 0 0 100px rgba(0,0,0,0.5);
  897. 			z-index: 999999;
  898. 			border-width: 8px;
  899. 			border-style: solid;
  900. 		}
  901. 	`
  902. 	+ Object.keys(COLORS).map(s => `
  903. 		#SEpreview[SEpreview-type="${s}"] {
  904. 			border-color: rgb(${COLORS[s].backRGB});
  905. 		}
  906. 	`).join('')
  907. 	);
  908.  
  909. 	preview.stylesOverride = `
  910. 		body, html {
  911. 			min-width: unset!important;
  912. 			box-shadow: none!important;
  913. 			padding: 0!important;
  914. 			margin: 0!important;
  915. 		}
  916. 		html, body {
  917. 			background: unset!important;;
  918. 		}
  919. 		body {
  920. 			display: flex;
  921. 			flex-direction: column;
  922. 			height: 100vh;
  923. 		}
  924. 		#SEpreview-body a.SEpreviewable {
  925. 			text-decoration: underline !important;
  926. 		}
  927. 		#SEpreview-title {
  928. 			all: unset;
  929. 			display: block;
  930. 			padding: 20px 30px;
  931. 			font-weight: bold;
  932. 			font-size: 18px;
  933. 			line-height: 1.2;
  934. 			cursor: pointer;
  935. 		}
  936. 		#SEpreview-title:hover {
  937. 			text-decoration: underline;
  938. 		}
  939. 		#SEpreview-meta {
  940. 			position: absolute;
  941. 			top: .5ex;
  942. 			left: 30px;
  943. 			opacity: 0.5;
  944. 		}
  945. 		#SEpreview-title:hover + #SEpreview-meta {
  946. 			opacity: 1.0;
  947. 		}
  948.  
  949. 		#SEpreview-close {
  950. 			position: absolute;
  951. 			top: 0;
  952. 			right: 0;
  953. 			flex: none;
  954. 			cursor: pointer;
  955. 			padding: .5ex 1ex;
  956. 		}
  957. 		#SEpreview-close:after {
  958. 			content: "x"; }
  959. 		#SEpreview-close:active {
  960. 			background-color: rgba(0,0,0,.1); }
  961. 		#SEpreview-close:hover {
  962. 			background-color: rgba(0,0,0,.05); }
  963.  
  964. 		#SEpreview-body {
  965. 			position: relative;
  966. 			padding: 30px!important;
  967. 			overflow: auto;
  968. 			flex-grow: 2;
  969. 		}
  970. 		#SEpreview-body > .question-status {
  971. 			margin: -30px -30px 30px;
  972. 			padding-left: 30px;
  973. 		}
  974. 		#SEpreview-body .question-originals-of-duplicate {
  975. 			margin: -30px -30px 30px;
  976. 			padding: 15px 30px;
  977. 		}
  978. 		#SEpreview-body > .question-status h2 {
  979. 			font-weight: normal;
  980. 		}
  981.  
  982. 		#SEpreview-answers {
  983. 			all: unset;
  984. 			display: block;
  985. 			padding: 10px 10px 10px 30px;
  986. 			font-weight: bold;
  987. 			line-height: 1.0;
  988. 			border-top: 4px solid rgba(${COLORS.answer.backRGB}, 0.37);
  989. 			background-color: rgba(${COLORS.answer.backRGB}, 0.37);
  990. 			color: ${COLORS.answer.fore};
  991. 			word-break: break-word;
  992. 		}
  993. 		#SEpreview-answers:before {
  994. 			content: "Answers:";
  995. 			margin-right: 1ex;
  996. 			font-size: 20px;
  997. 			line-height: 48px;
  998. 		}
  999. 		#SEpreview-answers a {
  1000. 			color: ${COLORS.answer.fore};
  1001. 			text-decoration: none;
  1002. 			font-size: 11px;
  1003. 			font-family: monospace;
  1004. 			width: 32px;
  1005. 			display: inline-block;
  1006. 			vertical-align: top;
  1007. 			margin: 0 1ex 1ex  0;
  1008. 		}
  1009. 		#SEpreview-answers img {
  1010. 			width: 32px;
  1011. 			height: 32px;
  1012. 		}
  1013. 		.SEpreview-accepted {
  1014. 			position: relative;
  1015. 		}
  1016. 		.SEpreview-accepted:after {
  1017. 			content: "✔";
  1018. 			position: absolute;
  1019. 			display: block;
  1020. 			top: 1.3ex;
  1021. 			right: -0.7ex;
  1022. 			font-size: 32px;
  1023. 			color: #4bff2c;
  1024. 			text-shadow: 1px 2px 2px rgba(0,0,0,0.5);
  1025. 		}
  1026. 		#SEpreview-answers a.deleted-answer {
  1027. 			color: ${COLORS.deleted.fore};
  1028. 			background: transparent;
  1029. 			opacity: 0.25;
  1030. 		}
  1031. 		#SEpreview-answers a.deleted-answer:hover {
  1032. 			opacity: 1.0;
  1033. 		}
  1034. 		#SEpreview-answers a:hover:not(.SEpreviewed) {
  1035. 			text-decoration: underline;
  1036. 		}
  1037. 		#SEpreview-answers a.SEpreviewed {
  1038. 			background-color: ${COLORS.answer.fore};
  1039. 			color: ${COLORS.answer.foreInv};
  1040. 			position: relative;
  1041. 		}
  1042. 		#SEpreview-answers a.SEpreviewed:after {
  1043. 			display: block;
  1044. 			content: " ";
  1045. 			position: absolute;
  1046. 			left: -4px;
  1047. 			top: -4px;
  1048. 			right: -4px;
  1049. 			bottom: -4px;
  1050. 			border: 4px solid ${COLORS.answer.fore};
  1051. 		}
  1052.  
  1053. 		.comment-edit,
  1054. 		.delete-tag,
  1055. 		.comment-actions td:last-child {
  1056. 			display: none;
  1057. 		}
  1058. 		.comments {
  1059. 			border-top: none;
  1060. 		}
  1061. 		.comments tr:last-child td {
  1062. 			border-bottom: none;
  1063. 		}
  1064. 		.comments .new-comment-highlight {
  1065. 			-webkit-animation: highlight 9s cubic-bezier(0,.8,.37,.88);
  1066. 			-moz-animation: highlight 9s cubic-bezier(0,.8,.37,.88);
  1067. 			animation: highlight 9s cubic-bezier(0,.8,.37,.88);
  1068. 		}
  1069.  
  1070. 		.post-menu > span {
  1071. 			opacity: .35;
  1072. 		}
  1073. 		#user-menu {
  1074. 			position: absolute;
  1075. 		}
  1076. 		.SEpreview-userCard {
  1077. 			position: absolute;
  1078. 			display: none;
  1079. 			transition: opacity .25s cubic-bezier(.88,.02,.92,.66) .5s;
  1080. 			margin-top: -3rem;
  1081. 		}
  1082.  
  1083. 		.wmd-preview a:not(.post-tag), .post-text a:not(.post-tag), .comment-copy a:not(.post-tag) {
  1084. 			border-bottom: none;
  1085. 		}
  1086.  
  1087. 		@-webkit-keyframes highlight {
  1088. 			from {background-color: #ffcf78}
  1089. 			to   {background-color: none}
  1090. 		}
  1091. 	`
  1092. 	+ Object.keys(COLORS).map(s => `
  1093. 		body[SEpreview-type="${s}"] #SEpreview-title {
  1094. 			background-color: rgba(${COLORS[s].backRGB}, 0.37);
  1095. 			color: ${COLORS[s].fore};
  1096. 		}
  1097. 		body[SEpreview-type="${s}"] #SEpreview-body::-webkit-scrollbar {
  1098. 			background-color: rgba(${COLORS[s].backRGB}, 0.1); }
  1099. 		body[SEpreview-type="${s}"] #SEpreview-body::-webkit-scrollbar-thumb {
  1100. 			background-color: rgba(${COLORS[s].backRGB}, 0.2); }
  1101. 		body[SEpreview-type="${s}"] #SEpreview-body::-webkit-scrollbar-thumb:hover {
  1102. 			background-color: rgba(${COLORS[s].backRGB}, 0.3); }
  1103. 		body[SEpreview-type="${s}"] #SEpreview-body::-webkit-scrollbar-thumb:active {
  1104. 			background-color: rgba(${COLORS[s].backRGB}, 0.75); }
  1105. 	`).join('')
  1106. 	+ ['deleted', 'closed'].map(s => `
  1107. 		body[SEpreview-type="${s}"] #SEpreview-answers {
  1108. 			border-top-color: rgba(${COLORS[s].backRGB}, 0.37);
  1109. 			background-color: rgba(${COLORS[s].backRGB}, 0.37);
  1110. 			color: ${COLORS[s].fore};
  1111. 		}
  1112. 		body[SEpreview-type="${s}"] #SEpreview-answers a.SEpreviewed {
  1113. 			background-color: ${COLORS[s].fore};
  1114. 			color: ${COLORS[s].foreInv};
  1115. 		}
  1116. 		body[SEpreview-type="${s}"] #SEpreview-answers a.SEpreviewed:after {
  1117. 			border-color: ${COLORS[s].fore};
  1118. 		}
  1119. 	`).join('');
  1120. }

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