☰

SE Preview on hover

Shows preview of the linked questions/answers on hover

当前为 2017-02-18 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        0.3.0
  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. // @require        https://greasyfork.org/scripts/12228/code/setMutationHandler.js
  16. // @require        https://cdnjs.cloudflare.com/ajax/libs/lz-string/1.4.4/lz-string.min.js
  17. // @grant          GM_addStyle
  18. // @grant          GM_xmlhttpRequest
  19. // @connect        stackoverflow.com
  20. // @connect        superuser.com
  21. // @connect        serverfault.com
  22. // @connect        askubuntu.com
  23. // @connect        stackapps.com
  24. // @connect        mathoverflow.net
  25. // @connect        stackexchange.com
  26. // @connect        cdn.sstatic.net
  27. // @run-at         document-end
  28. // @noframes
  29. // ==/UserScript==
  30.  
  31. /* jshint lastsemic:true, multistr:true, laxbreak:true, -W030, -W041, -W084 */
  32.  
  33. const PREVIEW_DELAY = 200;
  34. const CACHE_DURATION = 1 * 60 * 1000; // 1 minute for the recently active posts, scales up logarithmically
  35. const COLORS = {
  36. 	question: {
  37. 		backRGB: '80, 133, 195',
  38. 		fore: '#265184',
  39. 	},
  40. 	answer: {
  41. 		backRGB: '112, 195, 80',
  42. 		fore: '#3f7722',
  43. 		foreInv: 'white',
  44. 	},
  45. 	deleted: {
  46. 		backRGB: '181, 103, 103',
  47. 		fore: 'rgb(181, 103, 103)',
  48. 		foreInv: 'white',
  49. 	},
  50. 	closed: {
  51. 		backRGB: '255, 206, 93',
  52. 		fore: 'rgb(194, 136, 0)',
  53. 		foreInv: 'white',
  54. 	},
  55. };
  56.  
  57. let xhr;
  58. let preview = {
  59. 	frame: null,
  60. 	link: null,
  61. 	hover: {x:0, y:0},
  62. 	timer: 0,
  63. 	stylesOverride: '',
  64. };
  65. const lockScroll = {pos: {x:0, y:0}, attach: null, detach:null, run:null};
  66.  
  67. const rxPreviewable = getURLregexForMatchedSites();
  68. const thisPageUrls = getPageBaseUrls(location.href);
  69.  
  70. initStyles();
  71. initPolyfills();
  72. setMutationHandler('a', onLinkAdded, {processExisting: true});
  73. setTimeout(cleanupCache, 10000);
  74.  
  75. /**************************************************************/
  76.  
  77. function onLinkAdded(links) {
  78. 	for (let i = 0, link; (link = links[i++]); ) {
  79. 		if (isLinkPreviewable(link)) {
  80. 			link.removeAttribute('title');
  81. 			$on('mouseover', link, onLinkHovered);
  82. 		}
  83. 	}
  84. }
  85.  
  86. function onLinkHovered(e) {
  87. 	if (e.ctrlKey || e.altKey || e.shiftKey || e.metaKey)
  88. 		return;
  89. 	preview.link = this;
  90. 	$on('mousemove', this, onLinkMouseMove);
  91. 	$on('mouseout', this, abortPreview);
  92. 	$on('mousedown', this, abortPreview);
  93. 	restartPreviewTimer(this);
  94. }
  95.  
  96. function onLinkMouseMove(e) {
  97. 	let stoppedMoving = Math.abs(preview.hover.x - e.clientX) < 2 &&
  98. 		Math.abs(preview.hover.y - e.clientY) < 2;
  99. 	if (!stoppedMoving)
  100. 		return;
  101. 	preview.hover.x = e.clientX;
  102. 	preview.hover.y = e.clientY;
  103. 	restartPreviewTimer(this);
  104. }
  105.  
  106. function restartPreviewTimer(link) {
  107. 	clearTimeout(preview.timer);
  108. 	preview.timer = setTimeout(() => {
  109. 		preview.timer = 0;
  110. 		$off('mousemove', link, onLinkMouseMove);
  111. 		if (link.matches(':hover'))
  112. 			downloadPreview(link.href);
  113. 	}, PREVIEW_DELAY);
  114. }
  115.  
  116. function abortPreview(e) {
  117. 	releaseLinkListeners(this);
  118. 	preview.timer = setTimeout(link => {
  119. 		if (link == preview.link && preview.frame && !preview.frame.matches(':hover'))
  120. 			preview.frame.contentWindow.postMessage('SEpreview-hidden', '*');
  121. 	}, PREVIEW_DELAY * 3, this);
  122. 	if (xhr)
  123. 		xhr.abort();
  124. }
  125.  
  126. function releaseLinkListeners(link = preview.link) {
  127. 	$off('mousemove', link, onLinkMouseMove);
  128. 	$off('mouseout', link, abortPreview);
  129. 	$off('mousedown', link, abortPreview);
  130. 	clearTimeout(preview.timer);
  131. }
  132.  
  133. function fadeOut(element, transition) {
  134. 	return new Promise(resolve => {
  135. 		if (transition) {
  136. 			element.style.transition = typeof transition == 'number' ? `opacity ${transition}s ease-in-out` : transition;
  137. 			setTimeout(doFadeOut);
  138. 		} else
  139. 			doFadeOut();
  140.  
  141. 		function doFadeOut() {
  142. 			element.style.opacity = 0;
  143. 			$on('transitionend', element, function done() {
  144. 				$off('transitionend', element, done);
  145. 				if (element.style.opacity == 0)
  146. 					element.style.display = 'none';
  147. 				resolve();
  148. 			});
  149. 		}
  150. 	});
  151. }
  152.  
  153. function fadeIn(element) {
  154. 	element.style.opacity = 0;
  155. 	element.style.display = 'block';
  156. 	setTimeout(() => element.style.opacity = 1);
  157. }
  158.  
  159. function downloadPreview(url) {
  160. 	const cached = readCache(url);
  161. 	if (cached) {
  162. 		if (preview.frame)
  163. 			preview.frame.style.transitionDuration = '0.1s';
  164. 		showPreview(cached);
  165. 	} else {
  166. 		if (preview.frame)
  167. 			preview.frame.style.transitionDuration = '';
  168. 		xhr = GM_xmlhttpRequest({
  169. 			method: 'GET',
  170. 			url: httpsUrl(url),
  171. 			onload: r => {
  172. 				const html = r.responseText;
  173. 				const lastActivity = showPreview({finalUrl: r.finalUrl, html});
  174. 				const inactiveDays = Math.max(0, (Date.now() - lastActivity) / (24 * 3600 * 1000));
  175. 				const cacheDuration = CACHE_DURATION * Math.pow(Math.log(inactiveDays + 1) + 1, 2);
  176. 				writeCache({url, finalUrl: r.finalUrl, html, cacheDuration});
  177. 			},
  178. 		});
  179. 	}
  180. }
  181.  
  182. function initPreview() {
  183. 	preview.frame = document.createElement('iframe');
  184. 	preview.frame.id = 'SEpreview';
  185. 	document.body.appendChild(preview.frame);
  186.  
  187. 	lockScroll.attach = e => {
  188. 		lockScroll.pos.x = scrollX;
  189. 		lockScroll.pos.y = scrollY;
  190. 		$on('scroll', document, lockScroll.run);
  191. 		$on('mouseover', document, lockScroll.detach);
  192. 	};
  193. 	lockScroll.run = e => scrollTo(lockScroll.pos.x, lockScroll.pos.y);
  194. 	lockScroll.detach = e => {
  195. 		$off('mouseout', document, lockScroll.detach);
  196. 		$off('scroll', document, lockScroll.run);
  197. 	};
  198. }
  199.  
  200. function showPreview({finalUrl, html, doc}) {
  201. 	doc = doc || new DOMParser().parseFromString(html, 'text/html');
  202. 	if (!doc || !doc.head)
  203. 		return error('no HEAD in the document received for', finalUrl);
  204.  
  205. 	if (!$('base', doc))
  206. 		doc.head.insertAdjacentHTML('afterbegin', `<base href="${finalUrl}">`);
  207.  
  208. 	const answerIdMatch = finalUrl.match(/questions\/\d+\/[^\/]+\/(\d+)/);
  209. 	const isQuestion = !answerIdMatch;
  210. 	const postId = answerIdMatch ? '#answer-' + answerIdMatch[1] : '#question';
  211. 	const post = $(postId + ' .post-text', doc);
  212. 	if (!post)
  213. 		return error('No parsable post found', doc);
  214. 	const isDeleted = !!post.closest('.deleted-answer');
  215. 	const title = $('meta[property="og:title"]', doc).content;
  216. 	const status = isQuestion && !$('.question-status', post) ? $('.question-status', doc) : null;
  217. 	const isClosed = $('.question-originals-of-duplicate, .close-as-off-topic-status-list, .close-status-suffix', doc);
  218. 	const comments = $(`${postId} .comments`, doc);
  219. 	const commentsHidden = +$('tbody', comments).dataset.remainingCommentsCount;
  220. 	const commentsShowLink = commentsHidden && $(`${postId} .js-show-link.comments-link`, doc);
  221. 	const finalUrlOfQuestion = getCacheableUrl(finalUrl);
  222. 	const lastActivity = tryCatch(() => new Date($('.lastactivity-link', doc).title).getTime()) || Date.now();
  223.  
  224. 	markPreviewableLinks(doc);
  225. 	$$remove('script', doc);
  226.  
  227. 	if (!preview.frame)
  228. 		initPreview();
  229.  
  230. 	let pvDoc, pvWin;
  231. 	preview.frame.style.display = '';
  232. 	preview.frame.setAttribute('SEpreview-type',
  233. 		isDeleted ? 'deleted' : isQuestion ? (isClosed ? 'closed' : 'question') : 'answer');
  234. 	onFrameReady(preview.frame).then(
  235. 		() => {
  236. 			pvDoc = preview.frame.contentDocument;
  237. 			pvWin = preview.frame.contentWindow;
  238. 			initPolyfills(pvWin);
  239. 		})
  240. 		.then(addStyles)
  241. 		.then(render)
  242. 		.then(show);
  243. 	return lastActivity;
  244.  
  245. 	function markPreviewableLinks(container) {
  246. 		for (let link of $$('a:not(.SEpreviewable)', container)) {
  247. 			if (rxPreviewable.test(link.href)) {
  248. 				link.removeAttribute('title');
  249. 				link.classList.add('SEpreviewable');
  250. 			}
  251. 		}
  252. 	}
  253.  
  254. 	function addStyles() {
  255. 		const SEpreviewStyles = $replaceOrCreate({
  256.     		id: 'SEpreviewStyles',
  257. 			tag: 'style', parent: pvDoc.head, className: 'SEpreview-reuse',
  258. 			innerHTML: preview.stylesOverride,
  259. 		});
  260. 		$replaceOrCreate($$('style', doc).map(e => ({
  261. 			id: 'SEpreview' + e.innerHTML.replace(/\W+/g, '').length,
  262. 			tag: 'style', before: SEpreviewStyles, className: 'SEpreview-reuse',
  263. 			innerHTML: e.innerHTML,
  264. 		})));
  265. 		$replaceOrCreate($$('link[rel="stylesheet"]', doc).map(e => ({
  266. 			id: e.href.replace(/\W+/g, ''),
  267. 			tag: 'link', before: SEpreviewStyles, className: 'SEpreview-reuse',
  268. 			href: e.href, rel: 'stylesheet',
  269. 		})));
  270. 		return onStyleSheetsReady($$('link[rel="stylesheet"]', pvDoc));
  271. 	}
  272.  
  273. 	function render() {
  274. 		pvDoc.body.setAttribute('SEpreview-type', preview.frame.getAttribute('SEpreview-type'));
  275.  
  276. 		$replaceOrCreate([{
  277. 		// title
  278. 			id: 'SEpreview-title', tag: 'a',
  279. 			parent: pvDoc.body, className: 'SEpreviewable',
  280.             href: finalUrlOfQuestion,
  281. 			textContent: title,
  282. 		}, {
  283. 		// close button
  284. 			id: 'SEpreview-close',
  285. 			parent: pvDoc.body,
  286. 			title: 'Or press Esc key while the preview is focused (also when just shown)',
  287. 		}, {
  288. 		// vote count, date, views#
  289. 			id: 'SEpreview-meta',
  290. 			parent: pvDoc.body,
  291. 			innerHTML: [
  292. 				$text('.vote-count-post', post.closest('table')).replace(/(-?)(\d+)/,
  293. 					(s, sign, v) => s == '0' ? '' : `<b>${s}</b> vote${+v > 1 ? 's' : ''}, `),
  294. 				isQuestion
  295. 					? $$('#qinfo tr', doc)
  296. 						.map(row => $$('.label-key', row).map($text).join(' '))
  297. 						.join(', ').replace(/^((.+?) (.+?), .+?), .+? \3$/, '$1')
  298. 					: [...$$('.user-action-time', post.closest('.answer'))]
  299. 						.reverse().map($text).join(', ')
  300. 			].join('')
  301. 		}, {
  302. 		// content wrapper
  303. 			id: 'SEpreview-body',
  304. 			parent: pvDoc.body,
  305. 			className: isDeleted ? 'deleted-answer' : '',
  306. 			children: [status, post.parentElement, comments, commentsShowLink],
  307. 		}]);
  308.  
  309. 		renderCode();
  310.  
  311. 		// render bottom shelf
  312. 		const answers = $$('.answer', doc);
  313. 		if (answers.length > (isQuestion ? 0 : 1)) {
  314. 			$replaceOrCreate({
  315. 				id: 'SEpreview-answers',
  316. 				parent: pvDoc.body,
  317. 				innerHTML: answers.map(renderShelfAnswer).join(' '),
  318. 			});
  319. 		} else
  320. 			$$remove('#SEpreview-answers', pvDoc);
  321.  
  322. 		// cleanup leftovers from previously displayed post and foreign elements not injected by us
  323. 		$$('style, link, body script, html > *:not(head):not(body)', pvDoc).forEach(e => {
  324. 			if (e.classList.contains('SEpreview-reuse'))
  325. 				e.classList.remove('SEpreview-reuse');
  326. 			else
  327. 				e.remove();
  328. 		});
  329. 	}
  330.  
  331. 	function renderCode() {
  332. 		const codeBlocks = $$('pre code', pvDoc);
  333. 		if (codeBlocks.length) {
  334. 			codeBlocks.forEach(e => e.parentElement.classList.add('prettyprint'));
  335. 			if (!pvWin.StackExchange) {
  336. 				pvWin.StackExchange = {};
  337. 				let script = $scriptIn(pvDoc.head);
  338. 				script.text = 'StackExchange = {}';
  339. 				script = $scriptIn(pvDoc.head);
  340. 				script.src = 'https://cdn.sstatic.net/Js/prettify-full.en.js';
  341. 				script.setAttribute('onload', 'prettyPrint()');
  342. 			} else
  343. 				$scriptIn(pvDoc.body).text = 'prettyPrint()';
  344. 		}
  345. 	}
  346.  
  347. 	function renderShelfAnswer(e) {
  348. 		const shortUrl = $('.short-link', e).href.replace(/(\d+)\/\d+/, '$1');
  349. 		const extraClasses = (e.matches(postId) ? ' SEpreviewed' : '') +
  350. 		      (e.matches('.deleted-answer') ? ' deleted-answer' : '') +
  351. 			  ($('.vote-accepted-on', e) ? ' SEpreview-accepted' : '');
  352. 		const author = $('.post-signature:last-child', e);
  353. 		const title = $text('.user-details a', author) + ' (rep ' +
  354. 			  $text('.reputation-score', author) + ')\n' +
  355. 			  $text('.user-action-time', author);
  356. 		const gravatar = $('img, .anonymous-gravatar, .community-wiki', author);
  357. 		return (
  358. 			`<a href="${shortUrl}" title="${title}" class="SEpreviewable${extraClasses}">` +
  359. 				$text('.vote-count-post', e).replace(/^0$/, '&nbsp;') + ' ' +
  360. 				(!gravatar ? '' : gravatar.src ? `<img src="${gravatar.src}">` : gravatar.outerHTML) +
  361. 			'</a>');
  362. 	}
  363.  
  364. 	function show() {
  365. 		pvDoc.onmouseover = lockScroll.attach;
  366. 		pvDoc.onclick = onClick;
  367. 		pvDoc.onkeydown = onKeyDown;
  368. 		pvWin.onmessage = e => e.data == 'SEpreview-hidden' && hide({fade: true});
  369. 		$$('.user-info a img', pvDoc).forEach(e => e.onmouseover = loadUserDetails);
  370. 		$('#SEpreview-body', pvDoc).scrollTop = 0;
  371. 		preview.frame.style.opacity = 1;
  372. 		preview.frame.focus();
  373. 	}
  374.  
  375. 	function hide({fade = false} = {}) {
  376. 		releaseLinkListeners();
  377. 		releasePreviewListeners();
  378. 		if (fade)
  379. 			fadeOut(preview.frame).then(maybeZap);
  380. 		else {
  381. 			preview.frame.style.opacity = 0;
  382. 			preview.frame.style.display = 'none';
  383. 			maybeZap();
  384. 		}
  385. 	}
  386.  
  387. 	function maybeZap() {
  388. 		if (preview.frame.style.opacity == 0)
  389. 			$$remove('#SEpreview-body, #SEpreview-answers', pvDoc);
  390. 	}
  391.  
  392. 	function releasePreviewListeners(e) {
  393. 		pvWin.onmessage = null;
  394. 		pvDoc.onmouseover = null;
  395. 		pvDoc.onclick = null;
  396. 		pvDoc.onkeydown = onKeyDown;
  397. 	}
  398.  
  399. 	function onClick(e) {
  400. 		if (e.target.id == 'SEpreview-close')
  401. 			return hide();
  402. 		const link = e.target.closest('a');
  403. 		if (!link)
  404. 			return;
  405. 		else if (link.matches('.js-show-link.comments-link')) {
  406. 			fadeOut(link, 0.5);
  407. 			loadComments();
  408. 		}
  409. 		else if (e.button || e.ctrlKey || e.altKey || e.shiftKey || e.metaKey || !link.matches('.SEpreviewable'))
  410. 			return (link.target = '_blank');
  411. 		else if (link.matches('#SEpreview-answers a, a#SEpreview-title'))
  412. 			showPreview({
  413. 				finalUrl: finalUrlOfQuestion + (link.id == 'SEpreview-title' ? '' : '/' + link.pathname.match(/\/(\d+)/)[1]),
  414. 				doc
  415. 			});
  416. 		else
  417. 			downloadPreview(link.getAttribute('SEpreview-fullUrl') || link.href);
  418. 		e.preventDefault();
  419. 	}
  420.  
  421. 	function onKeyDown(e) {
  422. 		if (e.ctrlKey || e.altKey || e.shiftKey || e.metaKey)
  423. 			return;
  424. 		if (e.keyCode == 27)
  425. 			hide();
  426. 	}
  427.  
  428. 	function loadComments() {
  429. 		GM_xmlhttpRequest({
  430. 			method: 'GET',
  431. 			url: new URL(finalUrl).origin + '/posts/' + comments.id.match(/\d+/)[0] + '/comments',
  432. 			onload: r => {
  433. 				let tbody = $(`#${comments.id} tbody`, pvDoc);
  434. 				let oldIds = new Set([...tbody.rows].map(e => e.id));
  435. 				tbody.innerHTML = r.responseText;
  436. 				tbody.closest('.comments').style.display = 'block';
  437. 				for (let tr of tbody.rows)
  438. 					if (!oldIds.has(tr.id))
  439. 						tr.classList.add('new-comment-highlight');
  440. 				markPreviewableLinks(tbody);
  441. 			},
  442. 		});
  443. 	}
  444.  
  445. 	function loadUserDetails(e, ready) {
  446. 		if (ready !== true)
  447. 			return setTimeout(loadUserDetails, PREVIEW_DELAY, e, true);
  448. 		$$('#user-menu', pvDoc).forEach(e => e.id = '');
  449. 		const userId = e.target.closest('a').pathname.match(/\d+/)[0];
  450. 		const existing = $(`.SEpreview-user[data-id="${userId}"]`, pvDoc);
  451. 		if (existing) {
  452. 			existing.id = 'user-menu';
  453. 			fadeIn(existing);
  454. 			return;
  455. 		}
  456. 		GM_xmlhttpRequest({
  457. 			method: 'GET',
  458. 			url: new URL(finalUrl).origin + '/users/user-info/' + userId,
  459. 			onload: r => {
  460. 				let userMenu = $replaceOrCreate({
  461. 					id: 'user-menu',
  462. 					dataset: {id: userId},
  463. 					parent: e.target.closest('.user-info'),
  464. 					className: 'SEpreview-user',
  465. 					innerHTML: r.responseText,
  466. 				});
  467. 				userMenu.onmouseout = e => e.target == userMenu && fadeOut(userMenu);
  468. 				fadeIn(userMenu);
  469. 			},
  470. 		});
  471. 	}
  472. }
  473.  
  474. function getCacheableUrl(url) {
  475. 	// strips querys and hashes and anything after the main part https://site/questions/####/title/
  476. 	return url
  477. 		.replace(/(\/q(?:uestions)?\/\d+\/[^\/]+).*/, '$1')
  478. 		.replace(/(\/a(?:nswers)?\/\d+).*/, '$1')
  479. 		.replace(/[?#].*$/, '');
  480. }
  481.  
  482. function readCache(url) {
  483. 	keyUrl = getCacheableUrl(url);
  484. 	const meta = (localStorage[keyUrl] || '').split('\t');
  485. 	const expired = +meta[0] < Date.now();
  486. 	const finalUrl = meta[1] || url;
  487. 	const keyFinalUrl = meta[1] ? getCacheableUrl(finalUrl) : keyUrl;
  488. 	return !expired && {
  489. 		finalUrl,
  490. 		html: LZString.decompressFromUTF16(localStorage[keyFinalUrl + '\thtml']),
  491. 	};
  492. }
  493.  
  494. function writeCache({url, finalUrl, html, cacheDuration = CACHE_DURATION, cleanupRetry}) {
  495. 	// keyUrl=expires
  496. 	// redirected keyUrl=expires+finalUrl, and an additional entry keyFinalUrl=expires is created
  497. 	// keyFinalUrl\thtml=html
  498. 	cacheDuration = Math.max(CACHE_DURATION, Math.min(0xDEADBEEF, Math.floor(cacheDuration)));
  499. 	finalUrl = finalUrl.replace(/[?#].*/, '');
  500. 	const keyUrl = getCacheableUrl(url);
  501. 	const keyFinalUrl = getCacheableUrl(finalUrl);
  502. 	const expires = Date.now() + cacheDuration;
  503. 	if (!tryCatch(() => localStorage[keyFinalUrl + '\thtml'] = LZString.compressToUTF16(html))) {
  504. 		if (cleanupRetry)
  505. 			return error('localStorage write error');
  506. 		cleanupCache({aggressive: true});
  507. 		setIimeout(writeCache, 0, {url, finalUrl, html, cacheDuration, cleanupRetry: true});
  508. 	}
  509. 	localStorage[keyFinalUrl] = expires;
  510. 	if (keyUrl != keyFinalUrl)
  511. 		localStorage[keyUrl] = expires + '\t' + finalUrl;
  512. 	setTimeout(() => {
  513. 		[keyUrl, keyFinalUrl, keyFinalUrl + '\thtml'].forEach(e => localStorage.removeItem(e));
  514. 	}, cacheDuration + 1000);
  515. }
  516.  
  517. function cleanupCache({aggressive = false} = {}) {
  518. 	Object.keys(localStorage).forEach(k => {
  519. 		if (k.match(/^https?:\/\/[^\t]+$/)) {
  520. 			let meta = (localStorage[k] || '').split('\t');
  521. 			if (+meta[0] > Date.now() && !aggressive)
  522. 				return;
  523. 			if (meta[1])
  524. 				localStorage.removeItem(meta[1]);
  525. 			localStorage.removeItem(`${meta[1] || k}\thtml`);
  526. 			localStorage.removeItem(k);
  527. 		}
  528. 	});
  529. }
  530.  
  531. function onFrameReady(frame) {
  532. 	if (frame.contentDocument.readyState == 'complete')
  533. 		return Promise.resolve();
  534. 	else
  535. 		return new Promise(resolve => {
  536. 			$on('load', frame, function onLoad() {
  537. 				$off('load', frame, onLoad);
  538. 				resolve();
  539. 			});
  540. 		});
  541. }
  542.  
  543. function onStyleSheetsReady(linkElements) {
  544. 	let retryCount = 0;
  545. 	return new Promise(function retry(resolve) {
  546. 		if (linkElements.every(e => e.sheet && e.sheet.href == e.href))
  547. 			resolve();
  548. 		else if (retryCount++ > 10)
  549. 			resolve();
  550. 		else
  551. 			setTimeout(retry, 0, resolve);
  552. 	});
  553. }
  554.  
  555. function getURLregexForMatchedSites() {
  556. 	return new RegExp('https?://(\\w*\\.)*(' + GM_info.script.matches.map(m =>
  557. 		m.match(/^.*?\/\/\W*(\w.*?)\//)[1].replace(/\./g, '\\.')
  558. 	).join('|') + ')/(questions|q|a|posts\/comments)/\\d+');
  559. }
  560.  
  561. function isLinkPreviewable(link) {
  562. 	const inPreview = link.ownerDocument != document;
  563. 	if (!rxPreviewable.test(link.href) || link.matches('.short-link'))
  564. 		return false;
  565. 	const pageUrls = inPreview ? getPageBaseUrls(preview.link.href) : thisPageUrls;
  566. 	const url = httpsUrl(link.href);
  567. 	return !url.startsWith(pageUrls.base) &&
  568. 		   !url.startsWith(pageUrls.short);
  569. }
  570.  
  571. function getPageBaseUrls(url) {
  572. 	const base = httpsUrl((url.match(rxPreviewable) || [])[0]);
  573. 	return base ? {
  574. 		base,
  575. 		short: base.replace('/questions/', '/q/'),
  576. 	} : {};
  577. }
  578.  
  579. function httpsUrl(url) {
  580. 	return (url || '').replace(/^http:/, 'https:');
  581. }
  582.  
  583. function $(selector, node = document) {
  584. 	return node.querySelector(selector);
  585. }
  586.  
  587. function $$(selector, node = document) {
  588. 	return node.querySelectorAll(selector);
  589. }
  590.  
  591. function $text(selector, node = document) {
  592. 	const e = typeof selector == 'string' ? node.querySelector(selector) : selector;
  593. 	return e ? e.textContent.trim() : '';
  594. }
  595.  
  596. function $$remove(selector, node = document) {
  597. 	node.querySelectorAll(selector).forEach(e => e.remove());
  598. }
  599.  
  600. function $appendChildren(newParent, elements) {
  601. 	const doc = newParent.ownerDocument;
  602. 	for (let e of elements)
  603. 		if (e)
  604. 		   newParent.appendChild(e.ownerDocument == doc ? e : doc.importNode(e, true));
  605. }
  606.  
  607. function $removeChildren(el) {
  608. 	if (!el.children.length)
  609. 		return;
  610. 	const range = new Range();
  611. 	range.selectNodeContents(el);
  612. 	range.deleteContents();
  613. }
  614.  
  615. function $replaceOrCreate(options) {
  616. 	if (typeof options.map == 'function')
  617. 		return options.map($replaceOrCreate);
  618.     const doc = (options.parent || options.before).ownerDocument;
  619. 	const el = doc.getElementById(options.id) || doc.createElement(options.tag || 'div');
  620. 	for (let key of Object.keys(options)) {
  621. 		const value = options[key];
  622. 		switch (key) {
  623. 			case 'tag':
  624. 			case 'parent':
  625. 			case 'before':
  626. 				break;
  627. 			case 'dataset':
  628. 				for (let dataAttr of Object.keys(value))
  629. 					if (el.dataset[dataAttr] != value[dataAttr])
  630. 						el.dataset[dataAttr] = value[dataAttr];
  631. 				break;
  632. 			case 'children':
  633. 				$removeChildren(el);
  634. 				$appendChildren(el, options[key]);
  635. 				break;
  636. 			default:
  637. 				if (key in el && el[key] != value)
  638. 					el[key] = value;
  639. 		}
  640. 	}
  641. 	if (!el.parentElement)
  642.     	(options.parent || options.before.parentElement).insertBefore(el, options.before);
  643. 	return el;
  644. }
  645.  
  646. function $scriptIn(element) {
  647. 	return element.appendChild(element.ownerDocument.createElement('script'));
  648. }
  649.  
  650. function $on(eventName, ...args) {
  651. // eventName, selector, node, callback, options
  652. // eventName, selector, callback, options
  653. // eventName, node, callback, options
  654. // eventName, callback, options
  655. 	const selector = typeof args[0] == 'string' ? args[0] : null;
  656. 	const node = args[0] instanceof Node ? args[0] : args[1] instanceof Node ? args[1] : document;
  657. 	const callback = args[typeof args[0] == 'function' ? 0 : typeof args[1] == 'function' ? 1 : 2];
  658. 	const options = args[args.length - 1] != callback ? args[args.length - 1] : undefined;
  659. 	const method = this == 'removeEventListener' ? this : 'addEventListener';
  660. 	(selector ? node.querySelector(selector) : node)[method](eventName, callback, options);
  661. }
  662.  
  663. function $off(eventName, ...args) {
  664. 	$on.apply('removeEventListener', arguments);
  665. }
  666.  
  667. function log(...args) {
  668. 	console.log(GM_info.script.name, ...args);
  669. }
  670.  
  671. function error(...args) {
  672. 	console.error(GM_info.script.name, ...args);
  673. }
  674.  
  675. function tryCatch(fn) {
  676. 	try { return fn() }
  677. 	catch(e) {}
  678. }
  679.  
  680. function initPolyfills(context = window) {
  681. 	for (let method of ['forEach', 'filter', 'map', 'every', context.Symbol.iterator])
  682. 		if (!context.NodeList.prototype[method])
  683. 			context.NodeList.prototype[method] = context.Array.prototype[method];
  684. }
  685.  
  686. function initStyles() {
  687. 	GM_addStyle(`
  688. 		#SEpreview {
  689. 			all: unset;
  690. 			box-sizing: content-box;
  691. 			width: 720px; /* 660px + 30px + 30px */
  692. 			height: 33%;
  693. 			min-height: 400px;
  694. 			position: fixed;
  695. 			opacity: 0;
  696. 			transition: opacity .25s cubic-bezier(.88,.02,.92,.66);
  697. 			right: 0;
  698. 			bottom: 0;
  699. 			padding: 0;
  700. 			margin: 0;
  701. 			background: white;
  702. 			box-shadow: 0 0 100px rgba(0,0,0,0.5);
  703. 			z-index: 999999;
  704. 			border-width: 8px;
  705. 			border-style: solid;
  706. 		}
  707. 	`
  708. 	+ Object.keys(COLORS).map(s => `
  709. 		#SEpreview[SEpreview-type="${s}"] {
  710. 			border-color: rgb(${COLORS[s].backRGB});
  711. 		}
  712. 	`).join('')
  713. 	);
  714.  
  715. 	preview.stylesOverride = `
  716. 		body, html {
  717. 			min-width: unset!important;
  718. 			box-shadow: none!important;
  719. 			padding: 0!important;
  720. 			margin: 0!important;
  721. 		}
  722. 		html, body {
  723. 			background: unset!important;;
  724. 		}
  725. 		body {
  726. 			display: flex;
  727. 			flex-direction: column;
  728. 			height: 100vh;
  729. 		}
  730. 		#SEpreview-body a.SEpreviewable {
  731. 			text-decoration: underline !important;
  732. 		}
  733. 		#SEpreview-title {
  734. 			all: unset;
  735. 			display: block;
  736. 			padding: 20px 30px;
  737. 			font-weight: bold;
  738. 			font-size: 18px;
  739. 			line-height: 1.2;
  740. 			cursor: pointer;
  741. 		}
  742. 		#SEpreview-title:hover {
  743. 			text-decoration: underline;
  744. 		}
  745. 		#SEpreview-meta {
  746. 			position: absolute;
  747. 			top: .5ex;
  748. 			left: 30px;
  749. 			opacity: 0.5;
  750. 		}
  751. 		#SEpreview-title:hover + #SEpreview-meta {
  752. 			opacity: 1.0;
  753. 		}
  754.  
  755. 		#SEpreview-close {
  756. 			position: absolute;
  757. 			top: 0;
  758. 			right: 0;
  759. 			flex: none;
  760. 			cursor: pointer;
  761. 			padding: .5ex 1ex;
  762. 		}
  763. 		#SEpreview-close:after {
  764. 			content: "x"; }
  765. 		#SEpreview-close:active {
  766. 			background-color: rgba(0,0,0,.1); }
  767. 		#SEpreview-close:hover {
  768. 			background-color: rgba(0,0,0,.05); }
  769.  
  770. 		#SEpreview-body {
  771. 			padding: 30px!important;
  772. 			overflow: auto;
  773. 			flex-grow: 2;
  774. 		}
  775. 		#SEpreview-body .post-menu {
  776. 			display: none!important;
  777. 		}
  778. 		#SEpreview-body > .question-status {
  779. 			margin: -30px -30px 30px;
  780. 			padding-left: 30px;
  781. 		}
  782. 		#SEpreview-body .question-originals-of-duplicate {
  783. 			margin: -30px -30px 30px;
  784. 			padding: 15px 30px;
  785. 		}
  786. 		#SEpreview-body > .question-status h2 {
  787. 			font-weight: normal;
  788. 		}
  789.  
  790. 		#SEpreview-answers {
  791. 			all: unset;
  792. 			display: block;
  793. 			padding: 10px 10px 10px 30px;
  794. 			font-weight: bold;
  795. 			line-height: 1.0;
  796. 			border-top: 4px solid rgba(${COLORS.answer.backRGB}, 0.37);
  797. 			background-color: rgba(${COLORS.answer.backRGB}, 0.37);
  798. 			color: ${COLORS.answer.fore};
  799. 			word-break: break-word;
  800. 		}
  801. 		#SEpreview-answers:before {
  802. 			content: "Answers:";
  803. 			margin-right: 1ex;
  804. 			font-size: 20px;
  805. 			line-height: 48px;
  806. 		}
  807. 		#SEpreview-answers a {
  808. 			color: ${COLORS.answer.fore};
  809. 			text-decoration: none;
  810. 			font-size: 11px;
  811. 			font-family: monospace;
  812. 			width: 32px;
  813. 			display: inline-block;
  814. 			vertical-align: top;
  815. 			margin: 0 1ex 1ex  0;
  816. 		}
  817. 		#SEpreview-answers img {
  818. 			width: 32px;
  819. 			height: 32px;
  820. 		}
  821. 		.SEpreview-accepted {
  822. 			position: relative;
  823. 		}
  824. 		.SEpreview-accepted:after {
  825. 			content: "✔";
  826. 			position: absolute;
  827. 			display: block;
  828. 			top: 1.3ex;
  829. 			right: -0.7ex;
  830. 			font-size: 32px;
  831. 			color: #4bff2c;
  832. 			text-shadow: 1px 2px 2px rgba(0,0,0,0.5);
  833. 		}
  834. 		#SEpreview-answers a.deleted-answer {
  835. 			color: ${COLORS.deleted.fore};
  836. 			background: transparent;
  837. 			opacity: 0.25;
  838. 		}
  839. 		#SEpreview-answers a.deleted-answer:hover {
  840. 			opacity: 1.0;
  841. 		}
  842. 		#SEpreview-answers a:hover:not(.SEpreviewed) {
  843. 			text-decoration: underline;
  844. 		}
  845. 		#SEpreview-answers a.SEpreviewed {
  846. 			background-color: ${COLORS.answer.fore};
  847. 			color: ${COLORS.answer.foreInv};
  848. 			position: relative;
  849. 		}
  850. 		#SEpreview-answers a.SEpreviewed:after {
  851. 			display: block;
  852. 			content: " ";
  853. 			position: absolute;
  854. 			left: -4px;
  855. 			top: -4px;
  856. 			right: -4px;
  857. 			bottom: -4px;
  858. 			border: 4px solid ${COLORS.answer.fore};
  859. 		}
  860.  
  861. 		.delete-tag,
  862. 		.comment-actions td:last-child {
  863. 			display: none;
  864. 		}
  865. 		.comments {
  866. 			border-top: none;
  867. 		}
  868. 		.comments tr:last-child td {
  869. 			border-bottom: none;
  870. 		}
  871. 		.comments .new-comment-highlight {
  872. 			-webkit-animation: highlight 9s cubic-bezier(0,.8,.37,.88);
  873. 			-moz-animation: highlight 9s cubic-bezier(0,.8,.37,.88);
  874. 			animation: highlight 9s cubic-bezier(0,.8,.37,.88);
  875. 		}
  876.  
  877. 		.user-info {
  878. 			position: relative;
  879. 		}
  880. 		#user-menu {
  881. 			position: absolute;
  882. 		}
  883. 		.SEpreview-user {
  884. 			position: absolute;
  885. 			right: -1em;
  886. 			top: -2em;
  887. 			transition: opacity .25s ease-in-out;
  888. 			opacity: 0;
  889. 			display: none;
  890. 		}
  891.  
  892. 		@-webkit-keyframes highlight {
  893. 			from {background-color: #ffcf78}
  894. 			to   {background-color: none}
  895. 		}
  896. 	`
  897. 	+ Object.keys(COLORS).map(s => `
  898. 		body[SEpreview-type="${s}"] #SEpreview-title {
  899. 			background-color: rgba(${COLORS[s].backRGB}, 0.37);
  900. 			color: ${COLORS[s].fore};
  901. 		}
  902. 		body[SEpreview-type="${s}"] #SEpreview-body::-webkit-scrollbar {
  903. 			background-color: rgba(${COLORS[s].backRGB}, 0.1); }
  904. 		body[SEpreview-type="${s}"] #SEpreview-body::-webkit-scrollbar-thumb {
  905. 			background-color: rgba(${COLORS[s].backRGB}, 0.2); }
  906. 		body[SEpreview-type="${s}"] #SEpreview-body::-webkit-scrollbar-thumb:hover {
  907. 			background-color: rgba(${COLORS[s].backRGB}, 0.3); }
  908. 		body[SEpreview-type="${s}"] #SEpreview-body::-webkit-scrollbar-thumb:active {
  909. 			background-color: rgba(${COLORS[s].backRGB}, 0.75); }
  910. 	`).join('')
  911. 	+ ['deleted', 'closed'].map(s => `
  912. 		body[SEpreview-type="${s}"] #SEpreview-answers {
  913. 			border-top-color: rgba(${COLORS[s].backRGB}, 0.37);
  914. 			background-color: rgba(${COLORS[s].backRGB}, 0.37);
  915. 			color: ${COLORS[s].fore};
  916. 		}
  917. 		body[SEpreview-type="${s}"] #SEpreview-answers a.SEpreviewed {
  918. 			background-color: ${COLORS[s].fore};
  919. 			color: ${COLORS[s].foreInv};
  920. 		}
  921. 		body[SEpreview-type="${s}"] #SEpreview-answers a.SEpreviewed:after {
  922. 			border-color: ${COLORS[s].fore};
  923. 		}
  924. 	`).join('');
  925. }