☰

SE Preview on hover

Shows preview of the linked questions/answers on hover

当前为 2017-02-21 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        0.4.1
  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. // @require        https://greasyfork.org/scripts/12228/code/setMutationHandler.js
  17. // @require        https://greasyfork.org/scripts/27531/code/LZString-2xspeedup.js
  18. // @grant          GM_addStyle
  19. // @grant          GM_xmlhttpRequest
  20. // @grant          GM_getValue
  21. // @grant          GM_setValue
  22. // @connect        stackoverflow.com
  23. // @connect        superuser.com
  24. // @connect        serverfault.com
  25. // @connect        askubuntu.com
  26. // @connect        stackapps.com
  27. // @connect        mathoverflow.net
  28. // @connect        stackexchange.com
  29. // @connect        cdn.sstatic.net
  30. // @run-at         document-end
  31. // @noframes
  32. // ==/UserScript==
  33.  
  34. /* jshint lastsemic:true, multistr:true, laxbreak:true, -W030, -W041, -W084 */
  35.  
  36. const PREVIEW_DELAY = 200;
  37. const CACHE_DURATION = 1 * 60 * 1000; // 1 minute for the recently active posts, scales up logarithmically
  38. const MIN_HEIGHT = 400; // px
  39. const COLORS = {
  40. 	question: {
  41. 		backRGB: '80, 133, 195',
  42. 		fore: '#265184',
  43. 	},
  44. 	answer: {
  45. 		backRGB: '112, 195, 80',
  46. 		fore: '#3f7722',
  47. 		foreInv: 'white',
  48. 	},
  49. 	deleted: {
  50. 		backRGB: '181, 103, 103',
  51. 		fore: 'rgb(181, 103, 103)',
  52. 		foreInv: 'white',
  53. 	},
  54. 	closed: {
  55. 		backRGB: '255, 206, 93',
  56. 		fore: 'rgb(194, 136, 0)',
  57. 		foreInv: 'white',
  58. 	},
  59. };
  60.  
  61. let xhr;
  62. const xhrNoSSL = new Set();
  63. const preview = {
  64. 	frame: null,
  65. 	link: null,
  66. 	hover: {x:0, y:0},
  67. 	timer: 0,
  68. 	stylesOverride: '',
  69. };
  70. const lockScroll = {};
  71.  
  72. const {full: rxPreviewable, siteOnly: rxPreviewableSite} = getURLregexForMatchedSites();
  73. const thisPageUrls = getPageBaseUrls(location.href);
  74.  
  75. initStyles();
  76. initPolyfills();
  77. setMutationHandler('a', onLinkAdded, {processExisting: true});
  78. setTimeout(cleanupCache, 10000);
  79.  
  80. /**************************************************************/
  81.  
  82. function onLinkAdded(links) {
  83. 	for (let i = 0, link; (link = links[i++]); ) {
  84. 		if (isLinkPreviewable(link)) {
  85. 			link.removeAttribute('title');
  86. 			$on('mouseover', link, onLinkHovered);
  87. 		}
  88. 	}
  89. }
  90.  
  91. function onLinkHovered(e) {
  92. 	if (hasKeyModifiers(e))
  93. 		return;
  94. 	preview.link = this;
  95. 	$on('mousemove', this, onLinkMouseMove);
  96. 	$on('mouseout', this, abortPreview);
  97. 	$on('mousedown', this, abortPreview);
  98. 	restartPreviewTimer(this);
  99. }
  100.  
  101. function onLinkMouseMove(e) {
  102. 	let stoppedMoving = Math.abs(preview.hover.x - e.clientX) < 2 &&
  103. 		Math.abs(preview.hover.y - e.clientY) < 2;
  104. 	if (!stoppedMoving)
  105. 		return;
  106. 	preview.hover.x = e.clientX;
  107. 	preview.hover.y = e.clientY;
  108. 	restartPreviewTimer(this);
  109. }
  110.  
  111. function restartPreviewTimer(link) {
  112. 	clearTimeout(preview.timer);
  113. 	preview.timer = setTimeout(() => {
  114. 		preview.timer = 0;
  115. 		$off('mousemove', link, onLinkMouseMove);
  116. 		if (link.matches(':hover'))
  117. 			downloadPreview(link.href);
  118. 	}, PREVIEW_DELAY);
  119. }
  120.  
  121. function abortPreview(e) {
  122. 	releaseLinkListeners(this);
  123. 	preview.timer = setTimeout(link => {
  124. 		if (link == preview.link && preview.frame && !preview.frame.matches(':hover'))
  125. 			preview.frame.contentWindow.postMessage('SEpreview-hidden', '*');
  126. 	}, PREVIEW_DELAY * 3, this);
  127. 	if (xhr)
  128. 		xhr.abort();
  129. }
  130.  
  131. function releaseLinkListeners(link = preview.link) {
  132. 	$off('mousemove', link, onLinkMouseMove);
  133. 	$off('mouseout', link, abortPreview);
  134. 	$off('mousedown', link, abortPreview);
  135. 	clearTimeout(preview.timer);
  136. }
  137.  
  138. function fadeOut(element, transition) {
  139. 	return new Promise(resolve => {
  140. 		if (transition) {
  141. 			element.style.transition = typeof transition == 'number' ? `opacity ${transition}s ease-in-out` : transition;
  142. 			setTimeout(doFadeOut);
  143. 		} else
  144. 			doFadeOut();
  145.  
  146. 		function doFadeOut() {
  147. 			element.style.opacity = '0';
  148. 			$on('transitionend', element, function done() {
  149. 				$off('transitionend', element, done);
  150. 				if (element.style.opacity == '0')
  151. 					element.style.display = 'none';
  152. 				resolve();
  153. 			});
  154. 		}
  155. 	});
  156. }
  157.  
  158. function fadeIn(element) {
  159. 	element.style.opacity = '0';
  160. 	element.style.display = 'block';
  161. 	setTimeout(() => element.style.opacity = '1');
  162. }
  163.  
  164. function downloadPreview(url) {
  165. 	const cached = readCache(url);
  166. 	if (cached)
  167. 		return showPreview(cached);
  168. 	doXHR({url: httpsUrl(url)}).then(r => {
  169. 		const html = r.responseText;
  170. 		const lastActivity = +showPreview({finalUrl: r.finalUrl, html});
  171. 		if (!lastActivity)
  172. 			return;
  173. 		const inactiveDays = Math.max(0, (Date.now() - lastActivity) / (24 * 3600 * 1000));
  174. 		const cacheDuration = CACHE_DURATION * Math.pow(Math.log(inactiveDays + 1) + 1, 2);
  175. 		setTimeout(writeCache, 1000, {url, finalUrl: r.finalUrl, html, cacheDuration});
  176. 	});
  177. }
  178.  
  179. function initPreview() {
  180. 	preview.frame = document.createElement('iframe');
  181. 	preview.frame.id = 'SEpreview';
  182. 	document.body.appendChild(preview.frame);
  183. 	makeResizable();
  184.  
  185. 	lockScroll.attach = e => {
  186. 		if (lockScroll.pos)
  187. 			return;
  188. 		lockScroll.pos = {x: scrollX, y: scrollY};
  189. 		$on('scroll', document, lockScroll.run);
  190. 		$on('mouseover', document, lockScroll.detach);
  191. 	};
  192. 	lockScroll.run = e => scrollTo(lockScroll.pos.x, lockScroll.pos.y);
  193. 	lockScroll.detach = e => {
  194. 		if (!lockScroll.pos)
  195. 			return;
  196. 		lockScroll.pos = null;
  197. 		$off('mouseover', document, lockScroll.detach);
  198. 		$off('scroll', document, lockScroll.run);
  199. 	};
  200. }
  201.  
  202. function showPreview({finalUrl, html, doc}) {
  203. 	doc = doc || new DOMParser().parseFromString(html, 'text/html');
  204. 	if (!doc || !doc.head)
  205. 		return error('no HEAD in the document received for', finalUrl);
  206.  
  207. 	if (!$('base', doc))
  208. 		doc.head.insertAdjacentHTML('afterbegin', `<base href="${finalUrl}">`);
  209.  
  210. 	const answerIdMatch = finalUrl.match(/questions\/\d+\/[^\/]+\/(\d+)/);
  211. 	const isQuestion = !answerIdMatch;
  212. 	const postId = answerIdMatch ? '#answer-' + answerIdMatch[1] : '#question';
  213. 	const post = $(postId + ' .post-text', doc);
  214. 	if (!post)
  215. 		return error('No parsable post found', doc);
  216. 	const isDeleted = !!post.closest('.deleted-answer');
  217. 	const title = $('meta[property="og:title"]', doc).content;
  218. 	const status = isQuestion && !$('.question-status', post) ? $('.question-status', doc) : null;
  219. 	const isClosed = $('.question-originals-of-duplicate, .close-as-off-topic-status-list, .close-status-suffix', doc);
  220. 	const comments = $(`${postId} .comments`, doc);
  221. 	const commentsHidden = +$('tbody', comments).dataset.remainingCommentsCount;
  222. 	const commentsShowLink = commentsHidden && $(`${postId} .js-show-link.comments-link`, doc);
  223. 	const finalUrlOfQuestion = getCacheableUrl(finalUrl);
  224. 	const lastActivity = tryCatch(() => new Date($('.lastactivity-link', doc).title).getTime()) || Date.now();
  225.  
  226. 	markPreviewableLinks(doc);
  227. 	$$remove('script', doc);
  228.  
  229. 	if (!preview.frame)
  230. 		initPreview();
  231.  
  232. 	let pvDoc, pvWin;
  233. 	preview.frame.style.display = '';
  234. 	preview.frame.setAttribute('SEpreview-type',
  235. 		isDeleted ? 'deleted' : isQuestion ? (isClosed ? 'closed' : 'question') : 'answer');
  236. 	onFrameReady(preview.frame).then(
  237. 		() => {
  238. 			pvDoc = preview.frame.contentDocument;
  239. 			pvWin = preview.frame.contentWindow;
  240. 			initPolyfills(pvWin);
  241. 		})
  242. 		.then(addStyles)
  243. 		.then(render)
  244. 		.then(show);
  245. 	return lastActivity;
  246.  
  247. 	function markPreviewableLinks(container) {
  248. 		for (let link of $$('a:not(.SEpreviewable)', container)) {
  249. 			if (rxPreviewable.test(link.href)) {
  250. 				link.removeAttribute('title');
  251. 				link.classList.add('SEpreviewable');
  252. 			}
  253. 		}
  254. 	}
  255.  
  256. 	function markHoverableUsers(container) {
  257. 		for (let link of $$('a[href*="/users/"]', container)) {
  258. 			if (rxPreviewableSite.test(link.href) && link.pathname.match(/^\/users\/\d+/)) {
  259. 				link.onmouseover = loadUserCard;
  260. 				link.classList.add('SEpreview-userLink');
  261. 			}
  262. 		}
  263. 	}
  264.  
  265. 	function addStyles() {
  266. 		const SEpreviewStyles = $replaceOrCreate({
  267.     		id: 'SEpreviewStyles',
  268. 			tag: 'style', parent: pvDoc.head, className: 'SEpreview-reuse',
  269. 			innerHTML: preview.stylesOverride,
  270. 		});
  271. 		$replaceOrCreate($$('style', doc).map(e => ({
  272. 			id: 'SEpreview' + e.innerHTML.replace(/\W+/g, '').length,
  273. 			tag: 'style', before: SEpreviewStyles, className: 'SEpreview-reuse',
  274. 			innerHTML: e.innerHTML,
  275. 		})));
  276. 		return onStyleSheetsReady(
  277. 			$replaceOrCreate($$('link[rel="stylesheet"]', doc).map(e => ({
  278. 				id: e.href.replace(/\W+/g, ''),
  279. 				tag: 'link', before: SEpreviewStyles, className: 'SEpreview-reuse',
  280. 				href: e.href, rel: 'stylesheet',
  281. 			})))
  282. 		);
  283. 	}
  284.  
  285. 	function render() {
  286. 		pvDoc.body.setAttribute('SEpreview-type', preview.frame.getAttribute('SEpreview-type'));
  287.  
  288. 		$replaceOrCreate([{
  289. 		// title
  290. 			id: 'SEpreview-title', tag: 'a',
  291. 			parent: pvDoc.body, className: 'SEpreviewable',
  292.             href: finalUrlOfQuestion,
  293. 			textContent: title,
  294. 		}, {
  295. 		// close button
  296. 			id: 'SEpreview-close',
  297. 			parent: pvDoc.body,
  298. 			title: 'Or press Esc key while the preview is focused (also when just shown)',
  299. 		}, {
  300. 		// vote count, date, views#
  301. 			id: 'SEpreview-meta',
  302. 			parent: pvDoc.body,
  303. 			innerHTML: [
  304. 				$text('.vote-count-post', post.closest('table')).replace(/(-?)(\d+)/,
  305. 					(s, sign, v) => s == '0' ? '' : `<b>${s}</b> vote${+v > 1 ? 's' : ''}, `),
  306. 				isQuestion
  307. 					? $$('#qinfo tr', doc)
  308. 						.map(row => $$('.label-key', row).map($text).join(' '))
  309. 						.join(', ').replace(/^((.+?) (.+?), .+?), .+? \3$/, '$1')
  310. 					: [...$$('.user-action-time', post.closest('.answer'))]
  311. 						.reverse().map($text).join(', ')
  312. 			].join('')
  313. 		}, {
  314. 		// content wrapper
  315. 			id: 'SEpreview-body',
  316. 			parent: pvDoc.body,
  317. 			className: isDeleted ? 'deleted-answer' : '',
  318. 			children: [status, post.parentElement, comments, commentsShowLink],
  319. 		}]);
  320.  
  321. 		// delinkify/remove non-functional items in post-menu
  322. 		$$remove('.short-link, .flag-post-link', pvDoc);
  323. 		$$('.post-menu a:not(.edit-post)', pvDoc).forEach(a => {
  324. 			if (a.children.length)
  325. 				a.outerHTML = `<span>${a.innerHTML}</span>`;
  326. 			else
  327. 				a.remove();
  328. 		});
  329.  
  330. 		// add a timeline link
  331. 		if (isQuestion)
  332. 			$('.post-menu', pvDoc).insertAdjacentHTML('beforeend',
  333. 				'<span class="lsep">|</span>' +
  334. 				`<a href="/posts/${new URL(finalUrl).pathname.match(/\d+/)[0]}/timeline">timeline</a>`);
  335.  
  336. 		// prettify code blocks
  337. 		const codeBlocks = $$('pre code', pvDoc);
  338. 		if (codeBlocks.length) {
  339. 			codeBlocks.forEach(e => e.parentElement.classList.add('prettyprint'));
  340. 			if (!pvWin.StackExchange) {
  341. 				pvWin.StackExchange = {};
  342. 				let script = $scriptIn(pvDoc.head);
  343. 				script.text = 'StackExchange = {}';
  344. 				script = $scriptIn(pvDoc.head);
  345. 				script.src = 'https://cdn.sstatic.net/Js/prettify-full.en.js';
  346. 				script.setAttribute('onload', 'prettyPrint()');
  347. 			} else
  348. 				$scriptIn(pvDoc.body).text = 'prettyPrint()';
  349. 		}
  350.  
  351. 		// render bottom shelf
  352. 		const answers = $$('.answer', doc);
  353. 		if (answers.length > (isQuestion ? 0 : 1)) {
  354. 			$replaceOrCreate({
  355. 				id: 'SEpreview-answers',
  356. 				parent: pvDoc.body,
  357. 				innerHTML: answers.map(renderShelfAnswer).join(' '),
  358. 			});
  359. 		} else
  360. 			$$remove('#SEpreview-answers', pvDoc);
  361.  
  362. 		// cleanup leftovers from previously displayed post and foreign elements not injected by us
  363. 		$$('style, link, body script, html > *:not(head):not(body), .post-menu .lsep + .lsep', pvDoc).forEach(e => {
  364. 			if (e.classList.contains('SEpreview-reuse'))
  365. 				e.classList.remove('SEpreview-reuse');
  366. 			else
  367. 				e.remove();
  368. 		});
  369. 	}
  370.  
  371. 	function renderShelfAnswer(e) {
  372. 		const shortUrl = $('.short-link', e).href.replace(/(\d+)\/\d+/, '$1');
  373. 		const extraClasses = (e.matches(postId) ? ' SEpreviewed' : '') +
  374. 		      (e.matches('.deleted-answer') ? ' deleted-answer' : '') +
  375. 			  ($('.vote-accepted-on', e) ? ' SEpreview-accepted' : '');
  376. 		const author = $('.post-signature:last-child', e);
  377. 		const title = $text('.user-details a', author) + ' (rep ' +
  378. 			  $text('.reputation-score', author) + ')\n' +
  379. 			  $text('.user-action-time', author);
  380. 		const gravatar = $('img, .anonymous-gravatar, .community-wiki', author);
  381. 		return (
  382. 			`<a href="${shortUrl}" title="${title}" class="SEpreviewable${extraClasses}">` +
  383. 				$text('.vote-count-post', e).replace(/^0$/, '&nbsp;') + ' ' +
  384. 				(!gravatar ? '' : gravatar.src ? `<img src="${gravatar.src}">` : gravatar.outerHTML) +
  385. 			'</a>');
  386. 	}
  387.  
  388. 	function show() {
  389. 		pvDoc.onmouseover = lockScroll.attach;
  390. 		pvDoc.onclick = onClick;
  391. 		pvDoc.onkeydown = e => !hasKeyModifiers(e) && e.keyCode == 27 ? hide() : null;
  392. 		pvWin.onmessage = e => e.data == 'SEpreview-hidden' ? hide({fade: true}) : null;
  393. 		markHoverableUsers(pvDoc);
  394. 		$('#SEpreview-body', pvDoc).scrollTop = 0;
  395. 		preview.frame.style.opacity = '1';
  396. 		preview.frame.focus();
  397. 	}
  398.  
  399. 	function hide({fade = false} = {}) {
  400. 		releaseLinkListeners();
  401. 		releasePreviewListeners();
  402. 		const maybeZap = () => preview.frame.style.opacity == '0' && $removeChildren(pvDoc.body);
  403. 		if (fade)
  404. 			fadeOut(preview.frame).then(maybeZap);
  405. 		else {
  406. 			preview.frame.style.opacity = '0';
  407. 			preview.frame.style.display = 'none';
  408. 			maybeZap();
  409. 		}
  410. 	}
  411.  
  412. 	function releasePreviewListeners(e) {
  413. 		pvWin.onmessage = null;
  414. 		pvDoc.onmouseover = null;
  415. 		pvDoc.onclick = null;
  416. 		pvDoc.onkeydown = null;
  417. 	}
  418.  
  419. 	function onClick(e) {
  420. 		if (e.target.id == 'SEpreview-close')
  421. 			return hide();
  422.  
  423. 		const link = e.target.closest('a');
  424. 		if (!link)
  425. 			return;
  426.  
  427. 		if (link.matches('.js-show-link.comments-link')) {
  428. 			fadeOut(link, 0.5);
  429. 			loadComments();
  430. 			return e.preventDefault();
  431. 		}
  432.  
  433. 		if (e.button || hasKeyModifiers(e) || !link.matches('.SEpreviewable'))
  434. 			return (link.target = '_blank');
  435.  
  436. 		e.preventDefault();
  437.  
  438. 		if (link.id == 'SEpreview-title')
  439. 			showPreview({doc, finalUrl: finalUrlOfQuestion});
  440. 		else if (link.matches('#SEpreview-answers a'))
  441. 			showPreview({doc, finalUrl: finalUrlOfQuestion + '/' + link.pathname.match(/\/(\d+)/)[1]});
  442. 		else
  443. 			downloadPreview(link.href);
  444. 	}
  445.  
  446. 	function loadComments() {
  447. 		const url = new URL(finalUrl).origin + '/posts/' + comments.id.match(/\d+/)[0] + '/comments';
  448. 		doXHR({url}).then(r => {
  449. 			const tbody = $(`#${comments.id} tbody`, pvDoc);
  450. 			const oldIds = new Set([...tbody.rows].map(e => e.id));
  451. 			tbody.innerHTML = r.responseText;
  452. 			tbody.closest('.comments').style.display = 'block';
  453. 			for (let tr of tbody.rows)
  454. 				if (!oldIds.has(tr.id))
  455. 					tr.classList.add('new-comment-highlight');
  456. 			markPreviewableLinks(tbody);
  457. 			markHoverableUsers(tbody);
  458. 		});
  459. 	}
  460.  
  461. 	function loadUserCard(e, ready) {
  462. 		if (ready !== true)
  463. 			return setTimeout(loadUserCard, PREVIEW_DELAY * 2, e, true);
  464. 		const link = e.target.closest('a');
  465. 		let timer;
  466. 		let userCard = link.nextElementSibling;
  467. 		if (userCard && userCard.matches('.SEpreview-userCard'))
  468. 			return fadeInUserCard();
  469. 		const url = link.origin + '/users/user-info/' + link.pathname.match(/\d+/)[0];
  470.  
  471. 		Promise.resolve(
  472. 			readCache(url) ||
  473. 			doXHR({url}).then(r => {
  474. 				writeCache({url, html: r.responseText, cacheDuration: CACHE_DURATION * 100});
  475. 				return {html: r.responseText};
  476. 			})
  477. 		).then(renderUserCard);
  478.  
  479. 		function renderUserCard({html}) {
  480. 			const linkBounds = link.getBoundingClientRect();
  481. 			const wrapperBounds = $('#SEpreview-body', pvDoc).getBoundingClientRect();
  482. 			userCard = $replaceOrCreate({id: 'user-menu-tmp', className: 'SEpreview-userCard', innerHTML: html, after: link});
  483. 			userCard.style.left = Math.min(linkBounds.left - 20, pvWin.innerWidth - 350) + 'px';
  484. 			if (linkBounds.bottom + 100 > wrapperBounds.bottom)
  485. 				userCard.style.marginTop = '-5rem';
  486. 			userCard.onmouseout = e => {
  487. 				if (e.target != userCard || userCard.contains(e.relatedTarget))
  488. 					if (e.relatedTarget) // null if mouse is outside the preview
  489. 						return;
  490. 				fadeOut(userCard);
  491. 				clearTimeout(timer);
  492. 				timer = 0;
  493. 			};
  494. 			fadeInUserCard();
  495. 		}
  496.  
  497. 		function fadeInUserCard() {
  498. 			if (userCard.id != 'user-menu') {
  499. 				$$('#user-menu', pvDoc).forEach(e => e.id = e.style.display = '' );
  500. 				userCard.id = 'user-menu';
  501. 			}
  502. 			userCard.style.opacity = '0';
  503. 			userCard.style.display = 'block';
  504. 			timer = setTimeout(() => timer && (userCard.style.opacity = '1'));
  505. 		}
  506. 	}
  507. }
  508.  
  509. function getCacheableUrl(url) {
  510. 	// strips queries and hashes and anything after the main part https://site/questions/####/title/
  511. 	return url
  512. 		.replace(/(\/q(?:uestions)?\/\d+\/[^\/]+).*/, '$1')
  513. 		.replace(/(\/a(?:nswers)?\/\d+).*/, '$1')
  514. 		.replace(/[?#].*$/, '');
  515. }
  516.  
  517. function readCache(url) {
  518. 	keyUrl = getCacheableUrl(url);
  519. 	const meta = (localStorage[keyUrl] || '').split('\t');
  520. 	const expired = +meta[0] < Date.now();
  521. 	const finalUrl = meta[1] || url;
  522. 	const keyFinalUrl = meta[1] ? getCacheableUrl(finalUrl) : keyUrl;
  523. 	return !expired && {
  524. 		finalUrl,
  525. 		html: LZString.decompressFromUTF16(localStorage[keyFinalUrl + '\thtml']),
  526. 	};
  527. }
  528.  
  529. function writeCache({url, finalUrl, html, cacheDuration = CACHE_DURATION, cleanupRetry}) {
  530. 	// keyUrl=expires
  531. 	// redirected keyUrl=expires+finalUrl, and an additional entry keyFinalUrl=expires is created
  532. 	// keyFinalUrl\thtml=html
  533. 	cacheDuration = Math.max(CACHE_DURATION, Math.min(0xDEADBEEF, Math.floor(cacheDuration)));
  534. 	finalUrl = (finalUrl || url).replace(/[?#].*/, '');
  535. 	const keyUrl = getCacheableUrl(url);
  536. 	const keyFinalUrl = getCacheableUrl(finalUrl);
  537. 	const expires = Date.now() + cacheDuration;
  538. 	const lz = LZString.compressToUTF16(html);
  539. 	if (!tryCatch(() => localStorage[keyFinalUrl + '\thtml'] = lz)) {
  540. 		if (cleanupRetry)
  541. 			return error('localStorage write error');
  542. 		cleanupCache({aggressive: true});
  543. 		setIimeout(writeCache, 0, {url, finalUrl, html, cacheDuration, cleanupRetry: true});
  544. 	}
  545. 	localStorage[keyFinalUrl] = expires;
  546. 	if (keyUrl != keyFinalUrl)
  547. 		localStorage[keyUrl] = expires + '\t' + finalUrl;
  548. 	setTimeout(() => {
  549. 		[keyUrl, keyFinalUrl, keyFinalUrl + '\thtml'].forEach(e => localStorage.removeItem(e));
  550. 	}, cacheDuration + 1000);
  551. }
  552.  
  553. function cleanupCache({aggressive = false} = {}) {
  554. 	Object.keys(localStorage).forEach(k => {
  555. 		if (k.match(/^https?:\/\/[^\t]+$/)) {
  556. 			let meta = (localStorage[k] || '').split('\t');
  557. 			if (+meta[0] > Date.now() && !aggressive)
  558. 				return;
  559. 			if (meta[1])
  560. 				localStorage.removeItem(meta[1]);
  561. 			localStorage.removeItem(`${meta[1] || k}\thtml`);
  562. 			localStorage.removeItem(k);
  563. 		}
  564. 	});
  565. }
  566.  
  567. function onFrameReady(frame) {
  568. 	if (frame.contentDocument.readyState == 'complete')
  569. 		return Promise.resolve();
  570. 	else
  571. 		return new Promise(resolve => {
  572. 			$on('load', frame, function onLoad() {
  573. 				$off('load', frame, onLoad);
  574. 				resolve();
  575. 			});
  576. 		});
  577. }
  578.  
  579. function onStyleSheetsReady(linkElements) {
  580. 	let retryCount = 0;
  581. 	return new Promise(function retry(resolve) {
  582. 		if (linkElements.every(e => e.sheet && e.sheet.href == e.href))
  583. 			resolve();
  584. 		else if (retryCount++ > 10)
  585. 			resolve();
  586. 		else
  587. 			setTimeout(retry, 0, resolve);
  588. 	});
  589. }
  590.  
  591. function getURLregexForMatchedSites() {
  592. 	const sites = 'https?://(\\w*\\.)*(' + GM_info.script.matches.map(
  593. 		m => m.match(/^.*?\/\/\W*(\w.*?)\//)[1].replace(/\./g, '\\.')).join('|') + ')/';
  594. 	return {
  595. 		full: new RegExp(sites + '(questions|q|a|posts\/comments)/\\d+'),
  596. 		siteOnly: new RegExp(sites),
  597. 	};
  598. }
  599.  
  600. function isLinkPreviewable(link) {
  601. 	if (!rxPreviewable.test(link.href) || link.matches('.short-link'))
  602. 		return false;
  603. 	const inPreview = preview.frame && link.ownerDocument == preview.frame.contentDocument;
  604. 	const pageUrls = inPreview ? getPageBaseUrls(preview.link.href) : thisPageUrls;
  605. 	const url = httpsUrl(link.href);
  606. 	return url.indexOf(pageUrls.base) &&
  607. 		   url.indexOf(pageUrls.short);
  608. }
  609.  
  610. function getPageBaseUrls(url) {
  611. 	const base = httpsUrl((url.match(rxPreviewable) || [])[0]);
  612. 	return base ? {
  613. 		base,
  614. 		short: base.replace('/questions/', '/q/'),
  615. 	} : {};
  616. }
  617.  
  618. function httpsUrl(url) {
  619. 	return (url || '').replace(/^http:/, 'https:');
  620. }
  621.  
  622. function doXHR(options) {
  623. 	options = Object.assign({method: 'GET'}, options);
  624. 	const useHttpUrl = () => options.url = options.url.replace(/^https/, 'http');
  625. 	const hostname = new URL(options.url).hostname;
  626. 	if (xhrNoSSL.has(hostname))
  627. 		useHttpUrl();
  628. 	else if (options.url.startsWith('https')) {
  629. 		options.onerror = e => {
  630. 			useHttpUrl();
  631. 			xhrNoSSL.add(hostname);
  632. 			xhr = GM_xmlhttpRequest(options);
  633. 		};
  634. 	}
  635. 	if (options.onload)
  636. 		return (xhr = GM_xmlhttpRequest(options));
  637. 	else
  638. 		return new Promise(resolve => {
  639. 			xhr = GM_xmlhttpRequest(Object.assign(options, {onload: resolve}));
  640. 		});
  641. }
  642.  
  643. function makeResizable() {
  644. 	let heightOnClick;
  645. 	const pvDoc = preview.frame.contentDocument;
  646. 	const topBorderHeight = (preview.frame.offsetHeight - preview.frame.clientHeight) / 2;
  647. 	setHeight(GM_getValue('height', innerHeight / 3) |0);
  648.  
  649. 	// mouseover in the main page is fired only on the border of the iframe
  650. 	$on('mouseover', preview.frame, onOverAttach);
  651. 	$on('message', preview.frame.contentWindow, e => {
  652. 		if (e.data != 'SEpreview-hidden')
  653. 			return;
  654. 		if (heightOnClick) {
  655. 			releaseResizeListeners();
  656. 			setHeight(heightOnClick);
  657. 		}
  658. 		if (preview.frame.style.cursor)
  659. 			onOutDetach();
  660. 	});
  661.  
  662. 	function setCursorStyle(e) {
  663. 		return (preview.frame.style.cursor = e.offsetY <= 0 ? 's-resize' : '');
  664. 	}
  665.  
  666. 	function onOverAttach(e) {
  667. 		setCursorStyle(e);
  668. 		$on('mouseout', preview.frame, onOutDetach);
  669. 		$on('mousemove', preview.frame, onMoveChangeCursor);
  670. 		$on('mousedown', onDownStartResize);
  671. 	}
  672.  
  673. 	function onMoveChangeCursor(e) {
  674. 		setCursorStyle(e);
  675. 	}
  676.  
  677. 	function onOutDetach(e) {
  678. 		if (!e || !e.relatedTarget || !pvDoc.contains(e.relatedTarget)) {
  679. 			$off('mouseout', preview.frame, onOutDetach);
  680. 			$off('mousemove', preview.frame, onMoveChangeCursor);
  681. 			$off('mousedown', onDownStartResize);
  682. 			preview.frame.style.cursor = '';
  683. 		}
  684. 	}
  685.  
  686. 	function onDownStartResize(e) {
  687. 		if (!preview.frame.style.cursor)
  688. 			return;
  689. 		heightOnClick = preview.frame.clientHeight;
  690.  
  691. 		$off('mouseover', preview.frame, onOverAttach);
  692. 		$off('mousemove', preview.frame, onMoveChangeCursor);
  693. 		$off('mouseout', preview.frame, onOutDetach);
  694.  
  695. 		document.documentElement.style.cursor = 's-resize';
  696. 		document.body.style.cssText += ';pointer-events: none!important';
  697. 		$on('mousemove', onMoveResize);
  698. 		$on('mouseup',  onUpConfirm);
  699. 	}
  700.  
  701. 	function onMoveResize(e) {
  702. 		setHeight(innerHeight - topBorderHeight - e.clientY);
  703. 		getSelection().removeAllRanges();
  704. 		preview.frame.contentWindow.getSelection().removeAllRanges();
  705. 	}
  706.  
  707. 	function onUpConfirm(e) {
  708. 		GM_setValue('height', pvDoc.body.clientHeight);
  709. 		releaseResizeListeners(e);
  710. 	}
  711.  
  712. 	function releaseResizeListeners() {
  713. 		$off('mouseup', releaseResizeListeners);
  714. 		$off('mousemove', onMoveResize);
  715.  
  716. 		$on('mouseover', preview.frame, onOverAttach);
  717. 		onOverAttach({});
  718.  
  719. 		document.body.style.pointerEvents = '';
  720. 		document.documentElement.style.cursor = '';
  721. 		heightOnClick = 0;
  722. 	}
  723. }
  724.  
  725. function setHeight(height) {
  726. 	const currentHeight = preview.frame.clientHeight;
  727. 	const borderHeight = preview.frame.offsetHeight - currentHeight;
  728. 	const newHeight = Math.max(MIN_HEIGHT, Math.min(innerHeight - borderHeight, height));
  729. 	if (newHeight != currentHeight)
  730. 		preview.frame.style.height = newHeight + 'px';
  731. }
  732.  
  733. function $(selector, node = document) {
  734. 	return node.querySelector(selector);
  735. }
  736.  
  737. function $$(selector, node = document) {
  738. 	return node.querySelectorAll(selector);
  739. }
  740.  
  741. function $text(selector, node = document) {
  742. 	const e = typeof selector == 'string' ? node.querySelector(selector) : selector;
  743. 	return e ? e.textContent.trim() : '';
  744. }
  745.  
  746. function $$remove(selector, node = document) {
  747. 	node.querySelectorAll(selector).forEach(e => e.remove());
  748. }
  749.  
  750. function $appendChildren(newParent, elements) {
  751. 	const doc = newParent.ownerDocument;
  752. 	const fragment = doc.createDocumentFragment();
  753. 	for (let e of elements)
  754. 		if (e)
  755. 		   fragment.appendChild(e.ownerDocument == doc ? e : doc.importNode(e, true));
  756. 	newParent.appendChild(fragment);
  757. }
  758.  
  759. function $removeChildren(el) {
  760. 	if (el.children.length)
  761. 		el.innerHTML = ''; // the fastest as per https://jsperf.com/innerhtml-vs-removechild/256
  762. }
  763.  
  764. function $replaceOrCreate(options) {
  765. 	if (typeof options.map == 'function')
  766. 		return options.map($replaceOrCreate);
  767.     const doc = (options.parent || options.before || options.after).ownerDocument;
  768. 	const el = doc.getElementById(options.id) || doc.createElement(options.tag || 'div');
  769. 	for (let key of Object.keys(options)) {
  770. 		const value = options[key];
  771. 		switch (key) {
  772. 			case 'tag':
  773. 			case 'parent':
  774. 			case 'before':
  775. 			case 'after':
  776. 				break;
  777. 			case 'dataset':
  778. 				for (let dataAttr of Object.keys(value))
  779. 					if (el.dataset[dataAttr] != value[dataAttr])
  780. 						el.dataset[dataAttr] = value[dataAttr];
  781. 				break;
  782. 			case 'children':
  783. 				$removeChildren(el);
  784. 				$appendChildren(el, options[key]);
  785. 				break;
  786. 			default:
  787. 				if (key in el && el[key] != value)
  788. 					el[key] = value;
  789. 		}
  790. 	}
  791. 	if (!el.parentElement)
  792.     	(options.parent || (options.before || options.after).parentElement)
  793. 			.insertBefore(el, options.before || (options.after && options.after.nextElementSibling));
  794. 	return el;
  795. }
  796.  
  797. function $scriptIn(element) {
  798. 	return element.appendChild(element.ownerDocument.createElement('script'));
  799. }
  800.  
  801. function $on(eventName, ...args) {
  802. // eventName, selector, node, callback, options
  803. // eventName, selector, callback, options
  804. // eventName, node, callback, options
  805. // eventName, callback, options
  806. 	let i = 0;
  807. 	const selector = typeof args[i] == 'string' ? args[i++] : null;
  808. 	const node = args[i].nodeType ? args[i++] : document;
  809. 	const callback = args[i++];
  810. 	const options = args[i];
  811.  
  812. 	const actualNode = selector ? node.querySelector(selector) : node;
  813. 	const method = this == 'removeEventListener' ? this : 'addEventListener';
  814. 	actualNode[method](eventName, callback, options);
  815. }
  816.  
  817. function $off() {
  818. 	$on.apply('removeEventListener', arguments);
  819. }
  820.  
  821. function hasKeyModifiers(e) {
  822. 	return e.ctrlKey || e.altKey || e.shiftKey || e.metaKey;
  823. }
  824.  
  825. function log(...args) {
  826. 	console.log(GM_info.script.name, ...args);
  827. }
  828.  
  829. function error(...args) {
  830. 	console.error(GM_info.script.name, ...args);
  831. }
  832.  
  833. function tryCatch(fn) {
  834. 	try { return fn() }
  835. 	catch(e) {}
  836. }
  837.  
  838. function initPolyfills(context = window) {
  839. 	for (let method of ['forEach', 'filter', 'map', 'every', context.Symbol.iterator])
  840. 		if (!context.NodeList.prototype[method])
  841. 			context.NodeList.prototype[method] = context.Array.prototype[method];
  842. }
  843.  
  844. function initStyles() {
  845. 	GM_addStyle(`
  846. 		#SEpreview {
  847. 			all: unset;
  848. 			box-sizing: content-box;
  849. 			width: 720px; /* 660px + 30px + 30px */
  850. 			height: 33%;
  851. 			min-height: ${MIN_HEIGHT}px;
  852. 			position: fixed;
  853. 			opacity: 0;
  854. 			transition: opacity .25s cubic-bezier(.88,.02,.92,.66);
  855. 			right: 0;
  856. 			bottom: 0;
  857. 			padding: 0;
  858. 			margin: 0;
  859. 			background: white;
  860. 			box-shadow: 0 0 100px rgba(0,0,0,0.5);
  861. 			z-index: 999999;
  862. 			border-width: 8px;
  863. 			border-style: solid;
  864. 		}
  865. 	`
  866. 	+ Object.keys(COLORS).map(s => `
  867. 		#SEpreview[SEpreview-type="${s}"] {
  868. 			border-color: rgb(${COLORS[s].backRGB});
  869. 		}
  870. 	`).join('')
  871. 	);
  872.  
  873. 	preview.stylesOverride = `
  874. 		body, html {
  875. 			min-width: unset!important;
  876. 			box-shadow: none!important;
  877. 			padding: 0!important;
  878. 			margin: 0!important;
  879. 		}
  880. 		html, body {
  881. 			background: unset!important;;
  882. 		}
  883. 		body {
  884. 			display: flex;
  885. 			flex-direction: column;
  886. 			height: 100vh;
  887. 		}
  888. 		#SEpreview-body a.SEpreviewable {
  889. 			text-decoration: underline !important;
  890. 		}
  891. 		#SEpreview-title {
  892. 			all: unset;
  893. 			display: block;
  894. 			padding: 20px 30px;
  895. 			font-weight: bold;
  896. 			font-size: 18px;
  897. 			line-height: 1.2;
  898. 			cursor: pointer;
  899. 		}
  900. 		#SEpreview-title:hover {
  901. 			text-decoration: underline;
  902. 		}
  903. 		#SEpreview-meta {
  904. 			position: absolute;
  905. 			top: .5ex;
  906. 			left: 30px;
  907. 			opacity: 0.5;
  908. 		}
  909. 		#SEpreview-title:hover + #SEpreview-meta {
  910. 			opacity: 1.0;
  911. 		}
  912.  
  913. 		#SEpreview-close {
  914. 			position: absolute;
  915. 			top: 0;
  916. 			right: 0;
  917. 			flex: none;
  918. 			cursor: pointer;
  919. 			padding: .5ex 1ex;
  920. 		}
  921. 		#SEpreview-close:after {
  922. 			content: "x"; }
  923. 		#SEpreview-close:active {
  924. 			background-color: rgba(0,0,0,.1); }
  925. 		#SEpreview-close:hover {
  926. 			background-color: rgba(0,0,0,.05); }
  927.  
  928. 		#SEpreview-body {
  929. 			position: relative;
  930. 			padding: 30px!important;
  931. 			overflow: auto;
  932. 			flex-grow: 2;
  933. 		}
  934. 		#SEpreview-body > .question-status {
  935. 			margin: -30px -30px 30px;
  936. 			padding-left: 30px;
  937. 		}
  938. 		#SEpreview-body .question-originals-of-duplicate {
  939. 			margin: -30px -30px 30px;
  940. 			padding: 15px 30px;
  941. 		}
  942. 		#SEpreview-body > .question-status h2 {
  943. 			font-weight: normal;
  944. 		}
  945.  
  946. 		#SEpreview-answers {
  947. 			all: unset;
  948. 			display: block;
  949. 			padding: 10px 10px 10px 30px;
  950. 			font-weight: bold;
  951. 			line-height: 1.0;
  952. 			border-top: 4px solid rgba(${COLORS.answer.backRGB}, 0.37);
  953. 			background-color: rgba(${COLORS.answer.backRGB}, 0.37);
  954. 			color: ${COLORS.answer.fore};
  955. 			word-break: break-word;
  956. 		}
  957. 		#SEpreview-answers:before {
  958. 			content: "Answers:";
  959. 			margin-right: 1ex;
  960. 			font-size: 20px;
  961. 			line-height: 48px;
  962. 		}
  963. 		#SEpreview-answers a {
  964. 			color: ${COLORS.answer.fore};
  965. 			text-decoration: none;
  966. 			font-size: 11px;
  967. 			font-family: monospace;
  968. 			width: 32px;
  969. 			display: inline-block;
  970. 			vertical-align: top;
  971. 			margin: 0 1ex 1ex  0;
  972. 		}
  973. 		#SEpreview-answers img {
  974. 			width: 32px;
  975. 			height: 32px;
  976. 		}
  977. 		.SEpreview-accepted {
  978. 			position: relative;
  979. 		}
  980. 		.SEpreview-accepted:after {
  981. 			content: "✔";
  982. 			position: absolute;
  983. 			display: block;
  984. 			top: 1.3ex;
  985. 			right: -0.7ex;
  986. 			font-size: 32px;
  987. 			color: #4bff2c;
  988. 			text-shadow: 1px 2px 2px rgba(0,0,0,0.5);
  989. 		}
  990. 		#SEpreview-answers a.deleted-answer {
  991. 			color: ${COLORS.deleted.fore};
  992. 			background: transparent;
  993. 			opacity: 0.25;
  994. 		}
  995. 		#SEpreview-answers a.deleted-answer:hover {
  996. 			opacity: 1.0;
  997. 		}
  998. 		#SEpreview-answers a:hover:not(.SEpreviewed) {
  999. 			text-decoration: underline;
  1000. 		}
  1001. 		#SEpreview-answers a.SEpreviewed {
  1002. 			background-color: ${COLORS.answer.fore};
  1003. 			color: ${COLORS.answer.foreInv};
  1004. 			position: relative;
  1005. 		}
  1006. 		#SEpreview-answers a.SEpreviewed:after {
  1007. 			display: block;
  1008. 			content: " ";
  1009. 			position: absolute;
  1010. 			left: -4px;
  1011. 			top: -4px;
  1012. 			right: -4px;
  1013. 			bottom: -4px;
  1014. 			border: 4px solid ${COLORS.answer.fore};
  1015. 		}
  1016.  
  1017. 		.comment-edit,
  1018. 		.delete-tag,
  1019. 		.comment-actions td:last-child {
  1020. 			display: none;
  1021. 		}
  1022. 		.comments {
  1023. 			border-top: none;
  1024. 		}
  1025. 		.comments tr:last-child td {
  1026. 			border-bottom: none;
  1027. 		}
  1028. 		.comments .new-comment-highlight {
  1029. 			-webkit-animation: highlight 9s cubic-bezier(0,.8,.37,.88);
  1030. 			-moz-animation: highlight 9s cubic-bezier(0,.8,.37,.88);
  1031. 			animation: highlight 9s cubic-bezier(0,.8,.37,.88);
  1032. 		}
  1033.  
  1034. 		.post-menu > span {
  1035. 			opacity: .35;
  1036. 		}
  1037. 		#user-menu {
  1038. 			position: absolute;
  1039. 		}
  1040. 		.SEpreview-userCard {
  1041. 			position: absolute;
  1042. 			display: none;
  1043. 			transition: opacity .25s cubic-bezier(.88,.02,.92,.66) .5s;
  1044. 			margin-top: -3rem;
  1045. 		}
  1046.  
  1047. 		.wmd-preview a:not(.post-tag), .post-text a:not(.post-tag), .comment-copy a:not(.post-tag) {
  1048. 			border-bottom: none;
  1049. 		}
  1050.  
  1051. 		@-webkit-keyframes highlight {
  1052. 			from {background-color: #ffcf78}
  1053. 			to   {background-color: none}
  1054. 		}
  1055. 	`
  1056. 	+ Object.keys(COLORS).map(s => `
  1057. 		body[SEpreview-type="${s}"] #SEpreview-title {
  1058. 			background-color: rgba(${COLORS[s].backRGB}, 0.37);
  1059. 			color: ${COLORS[s].fore};
  1060. 		}
  1061. 		body[SEpreview-type="${s}"] #SEpreview-body::-webkit-scrollbar {
  1062. 			background-color: rgba(${COLORS[s].backRGB}, 0.1); }
  1063. 		body[SEpreview-type="${s}"] #SEpreview-body::-webkit-scrollbar-thumb {
  1064. 			background-color: rgba(${COLORS[s].backRGB}, 0.2); }
  1065. 		body[SEpreview-type="${s}"] #SEpreview-body::-webkit-scrollbar-thumb:hover {
  1066. 			background-color: rgba(${COLORS[s].backRGB}, 0.3); }
  1067. 		body[SEpreview-type="${s}"] #SEpreview-body::-webkit-scrollbar-thumb:active {
  1068. 			background-color: rgba(${COLORS[s].backRGB}, 0.75); }
  1069. 	`).join('')
  1070. 	+ ['deleted', 'closed'].map(s => `
  1071. 		body[SEpreview-type="${s}"] #SEpreview-answers {
  1072. 			border-top-color: rgba(${COLORS[s].backRGB}, 0.37);
  1073. 			background-color: rgba(${COLORS[s].backRGB}, 0.37);
  1074. 			color: ${COLORS[s].fore};
  1075. 		}
  1076. 		body[SEpreview-type="${s}"] #SEpreview-answers a.SEpreviewed {
  1077. 			background-color: ${COLORS[s].fore};
  1078. 			color: ${COLORS[s].foreInv};
  1079. 		}
  1080. 		body[SEpreview-type="${s}"] #SEpreview-answers a.SEpreviewed:after {
  1081. 			border-color: ${COLORS[s].fore};
  1082. 		}
  1083. 	`).join('');
  1084. }