☰

SE Preview on hover

Shows preview of the linked questions/answers on hover

当前为 2017-02-17 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        0.2.2
  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(204, 143, 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. 	cacheCSS: {},
  64. 	stylesOverride: '',
  65. };
  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. 			releaseLinkListeners(link);
  121. 			preview.frame.contentWindow.postMessage('SEpreview-hidden', '*');
  122. 			fadeOut(preview.frame);
  123. 		}
  124. 	}, PREVIEW_DELAY * 3, this);
  125. 	if (xhr)
  126. 		xhr.abort();
  127. }
  128.  
  129. function releaseLinkListeners(link) {
  130. 	$off('mousemove', link, onLinkMouseMove);
  131. 	$off('mouseout', link, abortPreview);
  132. 	$off('mousedown', link, abortPreview);
  133. 	clearTimeout(preview.timer);
  134. }
  135.  
  136. function fadeOut(element, transition) {
  137. 	if (transition) {
  138. 		element.style.transition = typeof transition == 'number' ? `opacity ${transition}s ease-in-out` : transition;
  139. 		return setTimeout(fadeOut, 0, element);
  140. 	}
  141. 	element.style.opacity = 0;
  142. 	$on('transitionend', element, function remove() {
  143. 		$off('transitionend', element, remove);
  144. 		if (+element.style.opacity === 0)
  145. 			element.style.display = 'none';
  146. 	});
  147. }
  148.  
  149. function downloadPreview(url) {
  150. 	let cached = readCache(url);
  151. 	if (cached)
  152. 		showPreview(cached);
  153. 	else {
  154. 		xhr = GM_xmlhttpRequest({
  155. 			method: 'GET',
  156. 			url: httpsUrl(url),
  157. 			onload: r => {
  158. 				let html = r.responseText;
  159. 				let lastActivity = showPreview({finalUrl: r.finalUrl, html});
  160. 				let inactiveDays = Math.max(0, (Date.now() - lastActivity) / (24 * 3600 * 1000));
  161. 				let cacheDuration = CACHE_DURATION * Math.pow(Math.log(inactiveDays + 1) + 1, 2);
  162. 				writeCache({url, finalUrl: r.finalUrl, html, cacheDuration});
  163. 			},
  164. 		});
  165. 	}
  166. }
  167.  
  168. function showPreview({finalUrl, html, doc}) {
  169. 	doc = doc || new DOMParser().parseFromString(html, 'text/html');
  170. 	if (!doc || !doc.head) {
  171. 		error('no HEAD in the document received for', finalUrl);
  172. 		return;
  173. 	}
  174.  
  175. 	if (!$('base', doc))
  176. 		doc.head.insertAdjacentHTML('afterbegin', `<base href="${finalUrl}">`);
  177.  
  178. 	const answerIdMatch = finalUrl.match(/questions\/\d+\/[^\/]+\/(\d+)/);
  179. 	const isQuestion = !answerIdMatch;
  180. 	const postId = answerIdMatch ? '#answer-' + answerIdMatch[1] : '#question';
  181. 	const post = $(postId + ' .post-text', doc);
  182. 	if (!post)
  183. 		return error('No parsable post found', doc);
  184. 	const isDeleted = post.closest('.deleted-answer');
  185. 	const title = $('meta[property="og:title"]', doc).content;
  186. 	const status = isQuestion && !$('.question-status', post) && $('.question-status', doc);
  187. 	const isClosed = $('.question-originals-of-duplicate, .close-as-off-topic-status-list, .close-status-suffix', doc);
  188. 	const comments = $(`${postId} .comments`, doc);
  189. 	const commentsHidden = +$('tbody', comments).dataset.remainingCommentsCount;
  190. 	const commentsShowLink = commentsHidden && $(`${postId} .js-show-link.comments-link`, doc);
  191. 	const finalUrlOfQuestion = getCacheableUrl(finalUrl);
  192.  
  193. 	const lastActivity = +doc.body.getAttribute('SEpreview-lastActivity')
  194. 		|| tryCatch(() => new Date($('.lastactivity-link', doc).title).getTime())
  195. 		|| Date.now();
  196. 	if (lastActivity)
  197. 		doc.body.setAttribute('SEpreview-lastActivity', lastActivity);
  198.  
  199. 	$$remove('script', doc);
  200.  
  201. 	// underline previewable links
  202. 	for (let link of $$('a:not(.SEpreviewable)', doc)) {
  203. 		if (rxPreviewable.test(link.href)) {
  204. 			link.removeAttribute('title');
  205. 			link.classList.add('SEpreviewable');
  206. 		}
  207. 	}
  208.  
  209. 	if (!preview.frame) {
  210. 		preview.frame = document.createElement('iframe');
  211. 		preview.frame.id = 'SEpreview';
  212.     	document.body.appendChild(preview.frame);
  213. 	}
  214.  
  215. 	let pvDoc, pvWin;
  216. 	preview.frame.setAttribute('SEpreview-type',
  217. 		isDeleted ? 'deleted' : isQuestion ? (isClosed ? 'closed' : 'question') : 'answer');
  218. 	onFrameReady(preview.frame).then(
  219. 		() => {
  220. 			pvDoc = preview.frame.contentDocument;
  221. 			pvWin = preview.frame.contentWindow;
  222. 			initPolyfills(pvWin);
  223. 		})
  224. 		.then(addStyles)
  225. 		.then(render)
  226. 		.then(show);
  227. 	return lastActivity;
  228.  
  229. 	function addStyles() {
  230. 		const SEpreviewStyles = $replaceOrCreate({
  231.     		id: 'SEpreviewStyles',
  232. 			tag: 'style', parent: pvDoc.head, className: 'SEpreview-reuse',
  233. 			innerHTML: preview.stylesOverride,
  234. 		});
  235.  
  236. 		$replaceOrCreate($$('style, link[rel="stylesheet"]', doc).map(e =>
  237. 			e.localName == 'style' ? {
  238. 				id: 'SEpreview' + e.innerHTML.replace(/\W+/g, '').length,
  239. 				tag: 'style', before: SEpreviewStyles, className: 'SEpreview-reuse',
  240. 				innerHTML: e.innerHTML,
  241. 			} : {
  242. 				id: e.href.replace(/\W+/g, ''),
  243. 				tag: 'link', before: SEpreviewStyles, className: 'SEpreview-reuse',
  244. 				href: e.href, rel: 'stylesheet',
  245. 			})
  246. 		);
  247.  
  248. 		return onStyleSheetsReady($$('link[rel="stylesheet"]', pvDoc));
  249. 	}
  250.  
  251. 	function render() {
  252. 		pvDoc.body.setAttribute('SEpreview-type', preview.frame.getAttribute('SEpreview-type'));
  253.  
  254. 		$replaceOrCreate([{
  255. 		// title
  256. 			id: 'SEpreview-title', tag: 'a',
  257. 			parent: pvDoc.body, className: 'SEpreviewable',
  258.             href: finalUrlOfQuestion,
  259. 			textContent: title,
  260. 		}, {
  261. 		// vote count, date, views#
  262. 			id: 'SEpreview-meta',
  263. 			parent: pvDoc.body,
  264. 			innerHTML: [
  265. 				renderVotes(post.closest('table')).replace(/(\S+) (\S+)/, '<b>$1</b> $2, '),
  266. 				isQuestion
  267. 					? $$('#qinfo tr', doc)
  268. 						.map(row => $$('.label-key', row).map($text).join(' '))
  269. 						.join(', ').replace(/^((.+?) (.+?), .+?), .+? \3$/, '$1')
  270. 					: [...$$('.user-action-time', post.closest('.answer'))]
  271. 						.reverse().map($text).join(', ')
  272. 			].join('')
  273. 		}, {
  274. 		// content wrapper
  275. 			id: 'SEpreview-body',
  276. 			parent: pvDoc.body,
  277. 			className: isDeleted ? 'deleted-answer' : '',
  278. 			children: [post.parentElement, comments, commentsShowLink, status],
  279. 		}]);
  280.  
  281. 		renderCode();
  282.  
  283. 		// render bottom shelf
  284. 		const answers = $$('.answer', doc);
  285. 		if (answers.length > (isQuestion ? 0 : 1)) {
  286. 			$replaceOrCreate({
  287. 				id: 'SEpreview-answers',
  288. 				parent: pvDoc.body,
  289. 				innerHTML: 'Answers:&nbsp;' + answers.map(renderShelfAnswer).join(''),
  290. 			});
  291. 		} else
  292. 			$$remove('#SEpreview-answers', pvDoc);
  293.  
  294. 		// cleanup leftovers from previously displayed post and foreign elements not injected by us
  295. 		$$('style, link, body script, html > *:not(head):not(body)', pvDoc).forEach(e => {
  296. 			if (e.classList.contains('SEpreview-reuse'))
  297. 				e.classList.remove('SEpreview-reuse');
  298. 			else
  299. 				e.remove();
  300. 		});
  301. 	}
  302.  
  303. 	function renderCode() {
  304. 		const codeBlocks = $$('pre code', pvDoc);
  305. 		if (codeBlocks.length) {
  306. 			codeBlocks.forEach(e => e.parentElement.classList.add('prettyprint'));
  307. 			if (!pvWin.StackExchange) {
  308. 				pvWin.StackExchange = {};
  309. 				let script = $scriptIn(pvDoc.head);
  310. 				script.text = 'StackExchange = {}';
  311. 				script = $scriptIn(pvDoc.head);
  312. 				script.src = 'https://cdn.sstatic.net/Js/prettify-full.en.js';
  313. 				script.setAttribute('onload', 'prettyPrint()');
  314. 			} else
  315. 				$scriptIn(pvDoc.body).text = 'prettyPrint()';
  316. 		}
  317. 	}
  318.  
  319. 	function renderShelfAnswer(e, index) {
  320. 		const shortUrl = $('.short-link', e).href.replace(/(\d+)\/\d+/, '$1');
  321. 		const extraClasses = (e.matches(postId) ? ' SEpreviewed' : '') +
  322. 		      (e.matches('.deleted-answer') ? ' deleted-answer' : '');
  323. 		const author = $('.post-signature:last-child', e);
  324. 		return `<a href="${shortUrl}"
  325. 		    SEpreview-fullUrl="${finalUrlOfQuestion + '/' + shortUrl.match(/\/(\d+)/)[1]}"
  326. 			title="${$text('.user-details a', author) +
  327. 			' (rep '+$text('.reputation-score', author) + ')\n' +
  328. 		             $text('.user-action-time', author) +
  329. 		             renderVotes(author)}"
  330. 			class="SEpreviewable${extraClasses}"
  331. 		>${index + 1}</a>`;
  332. 	}
  333.  
  334. 	function renderVotes(post) {
  335. 		return $text('.vote-count-post', post)
  336. 			.replace(/-?\d+/, s => s == '0' ? '' : '\n' + s + ' vote' + (+s > 1 ? 's' : ''));
  337. 	}
  338.  
  339. 	function show() {
  340. 		pvDoc.onmouseover = retainMainScrollPos;
  341. 		pvDoc.onclick = interceptLinks;
  342. 		pvWin.onmessage = e => {
  343. 			if (e.data == 'SEpreview-hidden') {
  344. 				pvWin.onmessage = null;
  345. 				pvDoc.onmouseover = null;
  346. 				pvDoc.onclick = null;
  347. 			}
  348. 		};
  349.  
  350. 		$('#SEpreview-body', pvDoc).scrollTop = 0;
  351. 		preview.frame.style.opacity = 1;
  352. 		preview.frame.style.display = '';
  353. 	}
  354.  
  355. 	function retainMainScrollPos(e) {
  356. 		let scrollPos = {x:scrollX, y:scrollY};
  357. 		$on('scroll', preventScroll);
  358. 		$on('mouseover', releaseScrollLock);
  359.  
  360. 		function preventScroll(e) {
  361. 			scrollTo(scrollPos.x, scrollPos.y);
  362. 		}
  363.  
  364. 		function releaseScrollLock(e) {
  365. 			$off('mouseout', releaseScrollLock);
  366. 			$off('scroll', preventScroll);
  367. 		}
  368. 	}
  369.  
  370. 	function interceptLinks(e) {
  371. 		const link = e.target.closest('a');
  372. 		if (!link)
  373. 			return;
  374. 		if (link.matches('.js-show-link.comments-link')) {
  375. 			fadeOut(link, 0.5);
  376. 			loadComments();
  377. 		}
  378. 		else if (e.button || e.ctrlKey || e.altKey || e.shiftKey || e.metaKey || !link.matches('.SEpreviewable'))
  379. 			return (link.target = '_blank');
  380. 		else if (link.matches('#SEpreview-answers a, a#SEpreview-title'))
  381. 			showPreview({
  382. 				finalUrl: link.getAttribute('SEpreview-fullUrl') || link.href,
  383. 				doc
  384. 			});
  385. 		else
  386. 			downloadPreview(link.getAttribute('SEpreview-fullUrl') || link.href);
  387. 		e.preventDefault();
  388. 	}
  389.  
  390. 	function loadComments() {
  391. 		GM_xmlhttpRequest({
  392. 			method: 'GET',
  393. 			url: new URL(finalUrl).origin + '/posts/' + comments.id.match(/\d+/)[0] + '/comments',
  394. 			onload: r => {
  395. 				let tbody = $(`#${comments.id} tbody`, pvDoc);
  396. 				let oldIds = new Set([...tbody.rows].map(e => e.id));
  397. 				tbody.innerHTML = r.responseText;
  398. 				for (let tr of tbody.rows)
  399. 					if (!oldIds.has(tr.id))
  400. 						tr.classList.add('new-comment-highlight');
  401. 			},
  402. 		});
  403. 	}
  404. }
  405.  
  406. function getCacheableUrl(url) {
  407. 	// strips querys and hashes and anything after the main part https://site/questions/####/title/
  408. 	return url
  409. 		.replace(/(\/q(?:uestions)?\/\d+\/[^\/]+).*/, '$1')
  410. 		.replace(/(\/a(?:nswers)?\/\d+).*/, '$1')
  411. 		.replace(/[?#].*$/, '');
  412. }
  413.  
  414. function readCache(url) {
  415. 	keyUrl = getCacheableUrl(url);
  416. 	const meta = (localStorage[keyUrl] || '').split('\t');
  417. 	const expired = +meta[0] < Date.now();
  418. 	const finalUrl = meta[1] || url;
  419. 	const keyFinalUrl = meta[1] ? getCacheableUrl(finalUrl) : keyUrl;
  420. 	return !expired && {
  421. 		finalUrl,
  422. 		html: LZString.decompressFromUTF16(localStorage[keyFinalUrl + '\thtml']),
  423. 	};
  424. }
  425.  
  426. function writeCache({url, finalUrl, html, cacheDuration = CACHE_DURATION, cleanupRetry}) {
  427. 	// keyUrl=expires
  428. 	// redirected keyUrl=expires+finalUrl, and an additional entry keyFinalUrl=expires is created
  429. 	// keyFinalUrl\thtml=html
  430. 	cacheDuration = Math.max(CACHE_DURATION, Math.min(0xDEADBEEF, Math.floor(cacheDuration)));
  431. 	finalUrl = finalUrl.replace(/[?#].*/, '');
  432. 	const keyUrl = getCacheableUrl(url);
  433. 	const keyFinalUrl = getCacheableUrl(finalUrl);
  434. 	const expires = Date.now() + cacheDuration;
  435. 	if (!tryCatch(() => localStorage[keyFinalUrl + '\thtml'] = LZString.compressToUTF16(html))) {
  436. 		if (cleanupRetry)
  437. 			return error('localStorage write error');
  438. 		cleanupCache({aggressive: true});
  439. 		setIimeout(writeCache, 0, {url, finalUrl, html, cacheDuration, cleanupRetry: true});
  440. 	}
  441. 	localStorage[keyFinalUrl] = expires;
  442. 	if (keyUrl != keyFinalUrl)
  443. 		localStorage[keyUrl] = expires + '\t' + finalUrl;
  444. 	setTimeout(() => {
  445. 		[keyUrl, keyFinalUrl, keyFinalUrl + '\thtml'].forEach(e => localStorage.removeItem(e));
  446. 	}, cacheDuration + 1000);
  447. }
  448.  
  449. function cleanupCache({aggressive = false} = {}) {
  450. 	Object.keys(localStorage).forEach(k => {
  451. 		if (k.match(/^https?:\/\/[^\t]+$/)) {
  452. 			let meta = (localStorage[k] || '').split('\t');
  453. 			if (+meta[0] > Date.now() && !aggressive)
  454. 				return;
  455. 			if (meta[1])
  456. 				localStorage.removeItem(meta[1]);
  457. 			localStorage.removeItem(`${meta[1] || k}\thtml`);
  458. 			localStorage.removeItem(k);
  459. 		}
  460. 	});
  461. }
  462.  
  463. function onFrameReady(frame) {
  464. 	if (frame.contentDocument.readyState == 'complete')
  465. 		return Promise.resolve();
  466. 	else
  467. 		return new Promise(resolve => {
  468. 			$on('load', frame, function onLoad() {
  469. 				$off('load', frame, onLoad);
  470. 				resolve();
  471. 			});
  472. 		});
  473. }
  474.  
  475. function onStyleSheetsReady(linkElements) {
  476. 	return new Promise(function retry(resolve) {
  477. 		if (linkElements.every(e => e.sheet && e.sheet.href == e.href))
  478. 			resolve();
  479. 		else
  480. 			setTimeout(retry, 0, resolve);
  481. 	});
  482. }
  483.  
  484. function getURLregexForMatchedSites() {
  485. 	return new RegExp('https?://(\\w*\\.)*(' + GM_info.script.matches.map(m =>
  486. 		m.match(/^.*?\/\/\W*(\w.*?)\//)[1].replace(/\./g, '\\.')
  487. 	).join('|') + ')/(questions|q|a)/\\d+');
  488. }
  489.  
  490. function isLinkPreviewable(link) {
  491. 	const inPreview = link.ownerDocument != document;
  492. 	if (!rxPreviewable.test(link.href) || link.matches('.short-link'))
  493. 		return false;
  494. 	const pageUrls = inPreview ? getPageBaseUrls(preview.link.href) : thisPageUrls;
  495. 	const url = httpsUrl(link.href);
  496. 	return !url.startsWith(pageUrls.base) &&
  497. 		   !url.startsWith(pageUrls.short);
  498. }
  499.  
  500. function getPageBaseUrls(url) {
  501. 	const base = httpsUrl((url.match(rxPreviewable) || [])[0]);
  502. 	return base ? {
  503. 		base,
  504. 		short: base.replace('/questions/', '/q/'),
  505. 	} : {};
  506. }
  507.  
  508. function httpsUrl(url) {
  509. 	return (url || '').replace(/^http:/, 'https:');
  510. }
  511.  
  512. function $(selector, node = document) {
  513. 	return node.querySelector(selector);
  514. }
  515.  
  516. function $$(selector, node = document) {
  517. 	return node.querySelectorAll(selector);
  518. }
  519.  
  520. function $text(selector, node = document) {
  521. 	const e = typeof selector == 'string' ? node.querySelector(selector) : selector;
  522. 	return e ? e.textContent.trim() : '';
  523. }
  524.  
  525. function $$remove(selector, node = document) {
  526. 	node.querySelectorAll(selector).forEach(e => e.remove());
  527. }
  528.  
  529. function $appendChildren(newParent, elements) {
  530. 	const doc = newParent.ownerDocument;
  531. 	for (let e of elements)
  532. 		if (e)
  533. 		   newParent.appendChild(e.ownerDocument == doc ? e : doc.importNode(e, true));
  534. }
  535.  
  536. function $replaceOrCreate(options) {
  537. 	if (options.length && typeof options[0] == 'object')
  538. 		return [].map.call(options, $replaceOrCreate);
  539.     const doc = (options.parent || options.before).ownerDocument;
  540. 	const el = doc.getElementById(options.id) || doc.createElement(options.tag || 'div');
  541. 	for (let key of Object.keys(options)) {
  542. 		switch (key) {
  543. 			case 'tag':
  544. 			case 'parent':
  545. 			case 'before':
  546. 				break;
  547. 			case 'children':
  548. 				if (el.children.length)
  549. 					el.innerHTML = '';
  550. 				$appendChildren(el, options[key]);
  551. 				break;
  552. 			default:
  553. 				const value = options[key];
  554. 				if (key in el && el[key] != value)
  555. 					el[key] = value;
  556. 		}
  557. 	}
  558. 	if (!el.parentElement)
  559.     	(options.parent || options.before.parentElement).insertBefore(el, options.before);
  560. 	return el;
  561. }
  562.  
  563. function $scriptIn(element) {
  564. 	return element.appendChild(element.ownerDocument.createElement('script'));
  565. }
  566.  
  567. function $on(eventName, ...args) {
  568. // eventName, selector, node, callback, options
  569. // eventName, selector, callback, options
  570. // eventName, node, callback, options
  571. // eventName, callback, options
  572. 	const selector = typeof args[0] == 'string' ? args[0] : null;
  573. 	const node = args[0] instanceof Node ? args[0] : args[1] instanceof Node ? args[1] : document;
  574. 	const callback = args[typeof args[0] == 'function' ? 0 : typeof args[1] == 'function' ? 1 : 2];
  575. 	const options = args[args.length - 1] != callback ? args[args.length - 1] : undefined;
  576. 	const method = this == 'removeEventListener' ? this : 'addEventListener';
  577. 	(selector ? node.querySelector(selector) : node)[method](eventName, callback, options);
  578. }
  579.  
  580. function $off(eventName, ...args) {
  581. 	$on.apply('removeEventListener', arguments);
  582. }
  583.  
  584. function log(...args) {
  585. 	console.log(GM_info.script.name, ...args);
  586. }
  587.  
  588. function error(...args) {
  589. 	console.error(GM_info.script.name, ...args);
  590. }
  591.  
  592. function tryCatch(fn) {
  593. 	try { return fn() }
  594. 	catch(e) {}
  595. }
  596.  
  597. function initPolyfills(context = window) {
  598. 	for (let method of ['forEach', 'filter', 'map', 'every', context.Symbol.iterator])
  599. 		if (!context.NodeList.prototype[method])
  600. 			context.NodeList.prototype[method] = context.Array.prototype[method];
  601. }
  602.  
  603. function initStyles() {
  604. 	GM_addStyle(`
  605. 		#SEpreview {
  606. 			all: unset;
  607. 			box-sizing: content-box;
  608. 			width: 720px; /* 660px + 30px + 30px */
  609. 			height: 33%;
  610. 			min-height: 200px;
  611. 			position: fixed;
  612. 			opacity: 0;
  613. 			transition: opacity .5s cubic-bezier(.88,.02,.92,.66);
  614. 			right: 0;
  615. 			bottom: 0;
  616. 			padding: 0;
  617. 			margin: 0;
  618. 			background: white;
  619. 			box-shadow: 0 0 100px rgba(0,0,0,0.5);
  620. 			z-index: 999999;
  621. 			border-width: 8px;
  622. 			border-style: solid;
  623. 		}
  624. 	`
  625. 	+ Object.keys(COLORS).map(s => `
  626. 		#SEpreview[SEpreview-type="${s}"] {
  627. 			border-color: rgb(${COLORS[s].backRGB});
  628. 		}
  629. 	`).join('')
  630. 	);
  631.  
  632. 	preview.stylesOverride = `
  633. 		body, html {
  634. 			min-width: unset!important;
  635. 			box-shadow: none!important;
  636. 			padding: 0!important;
  637. 			margin: 0!important;
  638. 		}
  639. 		html, body {
  640. 			background: unset!important;;
  641. 		}
  642. 		body {
  643. 			display: flex;
  644. 			flex-direction: column;
  645. 			height: 100vh;
  646. 		}
  647. 		a.SEpreviewable:not(#SEpreview-title) {
  648. 			text-decoration: underline !important;
  649. 		}
  650. 		#SEpreview-title {
  651. 			all: unset;
  652. 			display: block;
  653. 			padding: 20px 30px;
  654. 			font-weight: bold;
  655. 			font-size: 18px;
  656. 			line-height: 1.2;
  657. 			cursor: pointer;
  658. 		}
  659. 		#SEpreview-title:hover {
  660. 			text-decoration: underline;
  661. 		}
  662. 		#SEpreview-meta {
  663. 			position: absolute;
  664. 			top: .5ex;
  665. 			left: 30px;
  666. 			opacity: 0.5;
  667. 		}
  668. 		#SEpreview-title:hover + #SEpreview-meta {
  669. 			opacity: 1.0;
  670. 		}
  671.  
  672. 		#SEpreview-body {
  673. 			padding: 30px!important;
  674. 			overflow: auto;
  675. 			flex-grow: 2;
  676. 		}
  677. 		#SEpreview-body .post-menu {
  678. 			display: none!important;
  679. 		}
  680. 		#SEpreview-body > .question-status {
  681. 			margin: -10px -30px -30px;
  682. 			padding-left: 30px;
  683. 		}
  684. 		#SEpreview-body > .question-status h2 {
  685. 			font-weight: normal;
  686. 		}
  687. 		#SEpreview-body > a + .question-status {
  688. 			margin-top: 20px;
  689. 		}
  690.  
  691. 		#SEpreview-answers {
  692. 			all: unset;
  693. 			display: block;
  694. 			padding: 10px 30px;
  695. 			font-weight: bold;
  696. 			font-size: 20px;
  697. 			line-height: 1.3;
  698. 			border-top: 4px solid rgba(${COLORS.answer.backRGB}, 0.37);
  699. 			background-color: rgba(${COLORS.answer.backRGB}, 0.37);
  700. 			color: ${COLORS.answer.fore};
  701. 			word-break: break-word;
  702. 		}
  703. 		#SEpreview-answers a {
  704. 			color: ${COLORS.answer.fore};
  705. 			padding: .25ex .75ex;
  706. 			text-decoration: none;
  707. 		}
  708. 		#SEpreview-answers a.deleted-answer {
  709. 			color: ${COLORS.deleted.fore};
  710. 			background: transparent;
  711. 		}
  712. 		#SEpreview-answers a:hover:not(.SEpreviewed) {
  713. 			text-decoration: underline;
  714. 		}
  715. 		#SEpreview-answers a.SEpreviewed {
  716. 			background-color: ${COLORS.answer.fore};
  717. 			color: ${COLORS.answer.foreInv};
  718. 		}
  719.  
  720. 		.delete-tag,
  721. 		.comment-actions td:last-child {
  722. 			display: none;
  723. 		}
  724. 		.comments .new-comment-highlight {
  725. 			-webkit-animation: highlight 9s cubic-bezier(0,.8,.37,.88);
  726. 			-moz-animation: highlight 9s cubic-bezier(0,.8,.37,.88);
  727. 			animation: highlight 9s cubic-bezier(0,.8,.37,.88);
  728. 		}
  729.  
  730. 		@-webkit-keyframes highlight {
  731. 			from {background-color: #ffcf78}
  732. 			to   {background-color: none}
  733. 		}
  734. 	`
  735. 	+ Object.keys(COLORS).map(s => `
  736. 		body[SEpreview-type="${s}"] #SEpreview-title {
  737. 			background-color: rgba(${COLORS[s].backRGB}, 0.37);
  738. 			color: ${COLORS[s].fore};
  739. 		}
  740. 		body[SEpreview-type="${s}"] #SEpreview-body::-webkit-scrollbar {
  741. 			background-color: rgba(${COLORS[s].backRGB}, 0.1); }
  742. 		body[SEpreview-type="${s}"] #SEpreview-body::-webkit-scrollbar-thumb {
  743. 			background-color: rgba(${COLORS[s].backRGB}, 0.2); }
  744. 		body[SEpreview-type="${s}"] #SEpreview-body::-webkit-scrollbar-thumb:hover {
  745. 			background-color: rgba(${COLORS[s].backRGB}, 0.3); }
  746. 		body[SEpreview-type="${s}"] #SEpreview-body::-webkit-scrollbar-thumb:active {
  747. 			background-color: rgba(${COLORS[s].backRGB}, 0.75); }
  748. 	`).join('')
  749. 	+ ['deleted', 'closed'].map(s => `
  750. 		body[SEpreview-type="${s}"] #SEpreview-answers {
  751. 			border-top-color: rgba(${COLORS[s].backRGB}, 0.37);
  752. 			background-color: rgba(${COLORS[s].backRGB}, 0.37);
  753. 			color: ${COLORS[s].fore};
  754. 		}
  755. 		body[SEpreview-type="${s}"] #SEpreview-answers a.SEpreviewed {
  756. 			background-color: ${COLORS[s].fore};
  757. 			color: ${COLORS[s].foreInv};
  758. 		}
  759. 	`).join('')
  760. }