diff --git a/web-extension/background.js b/web-extension/background.js index 31d3f6d..9cec7bb 100644 --- a/web-extension/background.js +++ b/web-extension/background.js @@ -1,32 +1,3 @@ - -/////////////////// -/////////////////// -/////////////////// -/////////////////// -/// Only for testing - -chrome.runtime.onInstalled.addListener(details => { - if (navigator.userAgent === 'PuppeteerTestingAgent') { - let TEST_TIMER = null - chrome.tabs.onUpdated.addListener((tabId, changeInfo, tab) => { - if (TEST_TIMER) { - clearTimeout(TEST_TIMER) - } - - TEST_TIMER = setTimeout(()=> { - executeCommand({type: 'save-page'}) - }, 2000) - }); - } -}); - - - -/////////////////// -/////////////////// -/////////////////// -/////////////////// - var isBusy = false; var busyResetTimer = null @@ -149,8 +120,12 @@ display: none; ]; -chrome.commands.onCommand.addListener((command) => { - executeCommand({type: command}) +chrome.commands.onCommand.addListener(function (command) { + fetch(chrome.runtime.getURL("./libs/aboutReader.css")).then( + (d) => d.text() + ).then(function (css) { + executeCommand({type: command, readerCss: css}) + }); }); function executeCommand(command) { @@ -166,13 +141,13 @@ function executeCommand(command) { return; } if (command.type === 'save-page') { - dispatch('extract-page', false, []); + dispatch('extract-page', false, [command.readerCss]); } else if (command.type === 'save-selection') { - dispatch('extract-selection', false, []); + dispatch('extract-selection', false, [command.readerCss]); } else if (command.type === 'add-page') { - dispatch('extract-page', true, []); + dispatch('extract-page', true, [command.readerCss]); } else if (command.type === 'add-selection') { - dispatch('extract-selection', true, []); + dispatch('extract-selection', true, [command.readerCss]); } isBusy = true diff --git a/web-extension/extractHtml.js b/web-extension/extractHtml.js index fbb081e..ecf05a7 100644 --- a/web-extension/extractHtml.js +++ b/web-extension/extractHtml.js @@ -82,6 +82,17 @@ var webComponents = [ "readme-toc" ]; +function makeHeader(article) { + const div = document.createElement("div"); + const h1 = document.createElement("h1"); + div.className = "header reader-header reader-show-element"; + h1.className = "reader-title"; + h1.append(article.title); + div.append(h1); + + return div; +} + function getImageSrc(srcTxt) { if (!srcTxt) { return ''; @@ -256,94 +267,73 @@ function isVisible(elem) { ); } -function extractCss(includeStyle, appliedStyles) { - if (includeStyle) { - document.querySelectorAll("body *").forEach(function (pre, i) { - if ( - allowedTags.indexOf(pre.tagName.toLowerCase()) < 0 - || mathMLTags.indexOf(pre.tagName.toLowerCase()) > -1 - ) { - return; - } - - if (!isVisible(pre)) { -//Workaround: I think I should clone the visible nodes in a new DOM-like structure - pre.innerHTML = ""; - } else { - if (pre.tagName.toLowerCase() === "svg") return; - - const elementId = pre.tagName + "-" + generateRandomNumber(true); - let tmpName = generateRandomTag(2) + i; - cssClassesToTmpIds[elementId] = tmpName; - const tmpNewCss = {}; - const styles = window.getComputedStyle(pre); - - for (let cssTagName of supportedCss.concat(inheritedCss)) { - let cssValue = styles.getPropertyValue(cssTagName); - if (cssValue && cssValue.length > 0) { - if (cssTagName === "font-size") { - const parentFontSize = parseInt(getComputedStyle(pre.parentElement).getPropertyValue("font-size")); - if (parentFontSize > 0) { - cssValue = (parseInt(cssValue)/parentFontSize).toFixed(1) + "em"; - } - } - if (cssTagName === "line-height") { - const fontSize = parseInt(styles.getPropertyValue("font-size")); - const numCssValue = parseInt(cssValue); - if (numCssValue > 0) { - cssValue = (numCssValue / fontSize).toFixed(1); - } - } - if (["margin-left", "margin-right"].includes(cssTagName)) { - const parentWidth = parseInt(getComputedStyle(pre.parentElement).getPropertyValue("width")); - if (parentWidth > 0) { - cssValue = (100 * parseInt(cssValue)/parentWidth).toFixed(0) + "%"; - } - } - tmpNewCss[cssTagName] = cssValue; +function extractCss() { + document.querySelectorAll("body *").forEach(function (pre, i) { + if ( + allowedTags.indexOf(pre.tagName.toLowerCase()) < 0 + || mathMLTags.indexOf(pre.tagName.toLowerCase()) > -1 + ) { + return; + } + if (pre.tagName.toLowerCase() === "svg") return; + + const elementId = pre.tagName + "-" + generateRandomNumber(true); + let tmpName = generateRandomTag(2) + i; + cssClassesToTmpIds[elementId] = tmpName; + const tmpNewCss = {}; + const styles = window.getComputedStyle(pre); + + for (let cssTagName of supportedCss.concat(inheritedCss)) { + let cssValue = styles.getPropertyValue(cssTagName); + if (cssValue && cssValue.length > 0) { + if (cssTagName === "font-size") { + const parentFontSize = parseInt(getComputedStyle(pre.parentElement).getPropertyValue("font-size")); + if (parentFontSize > 0) { + cssValue = (parseInt(cssValue)/parentFontSize).toFixed(1) + "em"; } } - - // Reuse CSS - if the same css code was generated for another element, reuse it's class name - let tcss = JSON.stringify(tmpNewCss) - let found = false - - if (Object.keys(tmpIdsToNewCssSTRING).length === 0) { - tmpIdsToNewCssSTRING[tmpName] = tcss; - tmpIdsToNewCss[tmpName] = tmpNewCss; - } else { - for (const key in tmpIdsToNewCssSTRING) { - if (tmpIdsToNewCssSTRING[key] === tcss) { - tmpName = key - found = true - break - } + if (cssTagName === "line-height") { + const fontSize = parseInt(styles.getPropertyValue("font-size")); + const numCssValue = parseInt(cssValue); + if (numCssValue > 0) { + cssValue = (numCssValue / fontSize).toFixed(1); } - if (!found) { - tmpIdsToNewCssSTRING[tmpName] = tcss; - tmpIdsToNewCss[tmpName] = tmpNewCss; + } + if (["margin-left", "margin-right"].includes(cssTagName)) { + const parentWidth = parseInt(getComputedStyle(pre.parentElement).getPropertyValue("width")); + if (parentWidth > 0) { + cssValue = (100 * parseInt(cssValue)/parentWidth).toFixed(0) + "%"; } } - pre.setAttribute('data-class', tmpName); + tmpNewCss[cssTagName] = cssValue; } - }); - return jsonToCss(tmpIdsToNewCss); - } else { - // remove hidden elements when style is not included - document.querySelectorAll("body *").forEach(function ( pre) { - if (!isVisible(pre)) { - pre.outerHTML = ""; + } + + // Reuse CSS - if the same css code was generated for another element, reuse it's class name + let tcss = JSON.stringify(tmpNewCss) + let found = false + + if (Object.keys(tmpIdsToNewCssSTRING).length === 0) { + tmpIdsToNewCssSTRING[tmpName] = tcss; + tmpIdsToNewCss[tmpName] = tmpNewCss; + } else { + for (const key in tmpIdsToNewCssSTRING) { + if (tmpIdsToNewCssSTRING[key] === tcss) { + tmpName = key + found = true + break + } } - }); - let mergedCss = ""; - if (appliedStyles && appliedStyles.length > 0) { - for (let i = 0; i < appliedStyles.length; i++) { - mergedCss += appliedStyles[i].style; + if (!found) { + tmpIdsToNewCssSTRING[tmpName] = tcss; + tmpIdsToNewCss[tmpName] = tmpNewCss; } - return mergedCss; } - } - return null; + pre.setAttribute('data-class', tmpName); + + }); + + return jsonToCss(tmpIdsToNewCss); } ///// @@ -473,15 +463,35 @@ chrome.runtime.onMessage.addListener(function (request, sender, sendResponse) { } let imgsPromises = []; let result = {}; - let styleFile = null; const content = document.createElement("div"); extractIFrames(Array.from(document.querySelectorAll("iframe"))); + document.querySelectorAll("body *").forEach(function (pre) { + if (!isVisible(pre)) { + +// Workaround: I think I should clone the visible nodes in a new DOM-like structure + + pre.outerHTML = ""; + } + }); + //extract style and add data-class to every relevant node - styleFile = extractCss(request.includeStyle, request.appliedStyles); + const styleFile = ( + request.includeStyle + ? extractCss() + : request.appliedStyles[0] + ); if (request.type === "extract-page") { - Array.from(document.body.children).forEach((el) => content.appendChild(el.cloneNode(true))); + if (!request.includeStyle) { + const article = new Readability(document).parse(); + const header = makeHeader(article); + content.innerHTML = header.outerHTML + DOMPurify.sanitize(article.content); + } else { + Array.from(document.body.children).forEach( + (el) => content.appendChild(el.cloneNode(true)) + ); + } } else if (request.type === "extract-selection") { getSelectedNodes().forEach((fg) => content.appendChild(fg.cloneNode(true))); } diff --git a/web-extension/libs/Readability.js b/web-extension/libs/Readability.js new file mode 100644 index 0000000..ee81a9b --- /dev/null +++ b/web-extension/libs/Readability.js @@ -0,0 +1,2744 @@ +/* + * Copyright (c) 2010 Arc90 Inc + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +/* + * This code is heavily based on Arc90's readability.js (1.7.1) script + * available at: http://code.google.com/p/arc90labs-readability + */ + +/** + * Public constructor. + * @param {HTMLDocument} doc The document to parse. + * @param {Object} options The options object. + */ +function Readability(doc, options) { + // In some older versions, people passed a URI as the first argument. Cope: + if (options && options.documentElement) { + doc = options; + options = arguments[2]; + } else if (!doc || !doc.documentElement) { + throw new Error( + "First argument to Readability constructor should be a document object." + ); + } + options = options || {}; + + this._doc = doc; + this._docJSDOMParser = this._doc.firstChild.__JSDOMParser__; + this._articleTitle = null; + this._articleByline = null; + this._articleDir = null; + this._articleSiteName = null; + this._attempts = []; + this._metadata = {}; + + // Configurable options + this._debug = !!options.debug; + this._maxElemsToParse = + options.maxElemsToParse || this.DEFAULT_MAX_ELEMS_TO_PARSE; + this._nbTopCandidates = + options.nbTopCandidates || this.DEFAULT_N_TOP_CANDIDATES; + this._charThreshold = options.charThreshold || this.DEFAULT_CHAR_THRESHOLD; + this._classesToPreserve = this.CLASSES_TO_PRESERVE.concat( + options.classesToPreserve || [] + ); + this._keepClasses = !!options.keepClasses; + this._serializer = + options.serializer || + function (el) { + return el.innerHTML; + }; + this._disableJSONLD = !!options.disableJSONLD; + this._allowedVideoRegex = options.allowedVideoRegex || this.REGEXPS.videos; + this._linkDensityModifier = options.linkDensityModifier || 0; + + // Start with all flags set + this._flags = + this.FLAG_STRIP_UNLIKELYS | + this.FLAG_WEIGHT_CLASSES | + this.FLAG_CLEAN_CONDITIONALLY; + + // Control whether log messages are sent to the console + if (this._debug) { + let logNode = function (node) { + if (node.nodeType == node.TEXT_NODE) { + return `${node.nodeName} ("${node.textContent}")`; + } + let attrPairs = Array.from(node.attributes || [], function (attr) { + return `${attr.name}="${attr.value}"`; + }).join(" "); + return `<${node.localName} ${attrPairs}>`; + }; + this.log = function () { + if (typeof console !== "undefined") { + let args = Array.from(arguments, arg => { + if (arg && arg.nodeType == this.ELEMENT_NODE) { + return logNode(arg); + } + return arg; + }); + args.unshift("Reader: (Readability)"); + // eslint-disable-next-line no-console + console.log(...args); + } else if (typeof dump !== "undefined") { + /* global dump */ + var msg = Array.prototype.map + .call(arguments, function (x) { + return x && x.nodeName ? logNode(x) : x; + }) + .join(" "); + dump("Reader: (Readability) " + msg + "\n"); + } + }; + } else { + this.log = function () {}; + } +} + +Readability.prototype = { + FLAG_STRIP_UNLIKELYS: 0x1, + FLAG_WEIGHT_CLASSES: 0x2, + FLAG_CLEAN_CONDITIONALLY: 0x4, + + // https://developer.mozilla.org/en-US/docs/Web/API/Node/nodeType + ELEMENT_NODE: 1, + TEXT_NODE: 3, + + // Max number of nodes supported by this parser. Default: 0 (no limit) + DEFAULT_MAX_ELEMS_TO_PARSE: 0, + + // The number of top candidates to consider when analysing how + // tight the competition is among candidates. + DEFAULT_N_TOP_CANDIDATES: 5, + + // Element tags to score by default. + DEFAULT_TAGS_TO_SCORE: "section,h2,h3,h4,h5,h6,p,td,pre" + .toUpperCase() + .split(","), + + // The default number of chars an article must have in order to return a result + DEFAULT_CHAR_THRESHOLD: 500, + + // All of the regular expressions in use within readability. + // Defined up here so we don't instantiate them repeatedly in loops. + REGEXPS: { + // NOTE: These two regular expressions are duplicated in + // Readability-readerable.js. Please keep both copies in sync. + unlikelyCandidates: + /-ad-|ai2html|banner|breadcrumbs|combx|comment|community|cover-wrap|disqus|extra|footer|gdpr|header|legends|menu|related|remark|replies|rss|shoutbox|sidebar|skyscraper|social|sponsor|supplemental|ad-break|agegate|pagination|pager|popup|yom-remote/i, + okMaybeItsACandidate: /and|article|body|column|content|main|shadow/i, + + positive: + /article|body|content|entry|hentry|h-entry|main|page|pagination|post|text|blog|story/i, + negative: + /-ad-|hidden|^hid$| hid$| hid |^hid |banner|combx|comment|com-|contact|footer|gdpr|masthead|media|meta|outbrain|promo|related|scroll|share|shoutbox|sidebar|skyscraper|sponsor|shopping|tags|widget/i, + extraneous: + /print|archive|comment|discuss|e[\-]?mail|share|reply|all|login|sign|single|utility/i, + byline: /byline|author|dateline|writtenby|p-author/i, + replaceFonts: /<(\/?)font[^>]*>/gi, + normalize: /\s{2,}/g, + videos: + /\/\/(www\.)?((dailymotion|youtube|youtube-nocookie|player\.vimeo|v\.qq)\.com|(archive|upload\.wikimedia)\.org|player\.twitch\.tv)/i, + shareElements: /(\b|_)(share|sharedaddy)(\b|_)/i, + nextLink: /(next|weiter|continue|>([^\|]|$)|»([^\|]|$))/i, + prevLink: /(prev|earl|old|new|<|«)/i, + tokenize: /\W+/g, + whitespace: /^\s*$/, + hasContent: /\S$/, + hashUrl: /^#.+/, + srcsetUrl: /(\S+)(\s+[\d.]+[xw])?(\s*(?:,|$))/g, + b64DataUrl: /^data:\s*([^\s;,]+)\s*;\s*base64\s*,/i, + // Commas as used in Latin, Sindhi, Chinese and various other scripts. + // see: https://en.wikipedia.org/wiki/Comma#Comma_variants + commas: /\u002C|\u060C|\uFE50|\uFE10|\uFE11|\u2E41|\u2E34|\u2E32|\uFF0C/g, + // See: https://schema.org/Article + jsonLdArticleTypes: + /^Article|AdvertiserContentArticle|NewsArticle|AnalysisNewsArticle|AskPublicNewsArticle|BackgroundNewsArticle|OpinionNewsArticle|ReportageNewsArticle|ReviewNewsArticle|Report|SatiricalArticle|ScholarlyArticle|MedicalScholarlyArticle|SocialMediaPosting|BlogPosting|LiveBlogPosting|DiscussionForumPosting|TechArticle|APIReference$/, + // used to see if a node's content matches words commonly used for ad blocks or loading indicators + adWords: + /^(ad(vertising|vertisement)?|pub(licité)?|werb(ung)?|广告|Реклама|Anuncio)$/iu, + loadingWords: + /^((loading|正在加载|Загрузка|chargement|cargando)(…|\.\.\.)?)$/iu, + }, + + UNLIKELY_ROLES: [ + "menu", + "menubar", + "complementary", + "navigation", + "alert", + "alertdialog", + "dialog", + ], + + DIV_TO_P_ELEMS: new Set([ + "BLOCKQUOTE", + "DL", + "DIV", + "IMG", + "OL", + "P", + "PRE", + "TABLE", + "UL", + ]), + + ALTER_TO_DIV_EXCEPTIONS: ["DIV", "ARTICLE", "SECTION", "P", "OL", "UL"], + + PRESENTATIONAL_ATTRIBUTES: [ + "align", + "background", + "bgcolor", + "border", + "cellpadding", + "cellspacing", + "frame", + "hspace", + "rules", + "style", + "valign", + "vspace", + ], + + DEPRECATED_SIZE_ATTRIBUTE_ELEMS: ["TABLE", "TH", "TD", "HR", "PRE"], + + // The commented out elements qualify as phrasing content but tend to be + // removed by readability when put into paragraphs, so we ignore them here. + PHRASING_ELEMS: [ + // "CANVAS", "IFRAME", "SVG", "VIDEO", + "ABBR", + "AUDIO", + "B", + "BDO", + "BR", + "BUTTON", + "CITE", + "CODE", + "DATA", + "DATALIST", + "DFN", + "EM", + "EMBED", + "I", + "IMG", + "INPUT", + "KBD", + "LABEL", + "MARK", + "MATH", + "METER", + "NOSCRIPT", + "OBJECT", + "OUTPUT", + "PROGRESS", + "Q", + "RUBY", + "SAMP", + "SCRIPT", + "SELECT", + "SMALL", + "SPAN", + "STRONG", + "SUB", + "SUP", + "TEXTAREA", + "TIME", + "VAR", + "WBR", + ], + + // These are the classes that readability sets itself. + CLASSES_TO_PRESERVE: ["page"], + + // These are the list of HTML entities that need to be escaped. + HTML_ESCAPE_MAP: { + lt: "<", + gt: ">", + amp: "&", + quot: '"', + apos: "'", + }, + + /** + * Run any post-process modifications to article content as necessary. + * + * @param Element + * @return void + **/ + _postProcessContent(articleContent) { + // Readability cannot open relative uris so we convert them to absolute uris. + this._fixRelativeUris(articleContent); + + this._simplifyNestedElements(articleContent); + + if (!this._keepClasses) { + // Remove classes. + this._cleanClasses(articleContent); + } + }, + + /** + * Iterates over a NodeList, calls `filterFn` for each node and removes node + * if function returned `true`. + * + * If function is not passed, removes all the nodes in node list. + * + * @param NodeList nodeList The nodes to operate on + * @param Function filterFn the function to use as a filter + * @return void + */ + _removeNodes(nodeList, filterFn) { + // Avoid ever operating on live node lists. + if (this._docJSDOMParser && nodeList._isLiveNodeList) { + throw new Error("Do not pass live node lists to _removeNodes"); + } + for (var i = nodeList.length - 1; i >= 0; i--) { + var node = nodeList[i]; + var parentNode = node.parentNode; + if (parentNode) { + if (!filterFn || filterFn.call(this, node, i, nodeList)) { + parentNode.removeChild(node); + } + } + } + }, + + /** + * Iterates over a NodeList, and calls _setNodeTag for each node. + * + * @param NodeList nodeList The nodes to operate on + * @param String newTagName the new tag name to use + * @return void + */ + _replaceNodeTags(nodeList, newTagName) { + // Avoid ever operating on live node lists. + if (this._docJSDOMParser && nodeList._isLiveNodeList) { + throw new Error("Do not pass live node lists to _replaceNodeTags"); + } + for (const node of nodeList) { + this._setNodeTag(node, newTagName); + } + }, + + /** + * Iterate over a NodeList, which doesn't natively fully implement the Array + * interface. + * + * For convenience, the current object context is applied to the provided + * iterate function. + * + * @param NodeList nodeList The NodeList. + * @param Function fn The iterate function. + * @return void + */ + _forEachNode(nodeList, fn) { + Array.prototype.forEach.call(nodeList, fn, this); + }, + + /** + * Iterate over a NodeList, and return the first node that passes + * the supplied test function + * + * For convenience, the current object context is applied to the provided + * test function. + * + * @param NodeList nodeList The NodeList. + * @param Function fn The test function. + * @return void + */ + _findNode(nodeList, fn) { + return Array.prototype.find.call(nodeList, fn, this); + }, + + /** + * Iterate over a NodeList, return true if any of the provided iterate + * function calls returns true, false otherwise. + * + * For convenience, the current object context is applied to the + * provided iterate function. + * + * @param NodeList nodeList The NodeList. + * @param Function fn The iterate function. + * @return Boolean + */ + _someNode(nodeList, fn) { + return Array.prototype.some.call(nodeList, fn, this); + }, + + /** + * Iterate over a NodeList, return true if all of the provided iterate + * function calls return true, false otherwise. + * + * For convenience, the current object context is applied to the + * provided iterate function. + * + * @param NodeList nodeList The NodeList. + * @param Function fn The iterate function. + * @return Boolean + */ + _everyNode(nodeList, fn) { + return Array.prototype.every.call(nodeList, fn, this); + }, + + _getAllNodesWithTag(node, tagNames) { + if (node.querySelectorAll) { + return node.querySelectorAll(tagNames.join(",")); + } + return [].concat.apply( + [], + tagNames.map(function (tag) { + var collection = node.getElementsByTagName(tag); + return Array.isArray(collection) ? collection : Array.from(collection); + }) + ); + }, + + /** + * Removes the class="" attribute from every element in the given + * subtree, except those that match CLASSES_TO_PRESERVE and + * the classesToPreserve array from the options object. + * + * @param Element + * @return void + */ + _cleanClasses(node) { + var classesToPreserve = this._classesToPreserve; + var className = (node.getAttribute("class") || "") + .split(/\s+/) + .filter(cls => classesToPreserve.includes(cls)) + .join(" "); + + if (className) { + node.setAttribute("class", className); + } else { + node.removeAttribute("class"); + } + + for (node = node.firstElementChild; node; node = node.nextElementSibling) { + this._cleanClasses(node); + } + }, + + /** + * Converts each and uri in the given element to an absolute URI, + * ignoring #ref URIs. + * + * @param Element + * @return void + */ + _fixRelativeUris(articleContent) { + var baseURI = this._doc.baseURI; + var documentURI = this._doc.documentURI; + function toAbsoluteURI(uri) { + // Leave hash links alone if the base URI matches the document URI: + if (baseURI == documentURI && uri.charAt(0) == "#") { + return uri; + } + + // Otherwise, resolve against base URI: + try { + return new URL(uri, baseURI).href; + } catch (ex) { + // Something went wrong, just return the original: + } + return uri; + } + + var links = this._getAllNodesWithTag(articleContent, ["a"]); + this._forEachNode(links, function (link) { + var href = link.getAttribute("href"); + if (href) { + // Remove links with javascript: URIs, since + // they won't work after scripts have been removed from the page. + if (href.indexOf("javascript:") === 0) { + // if the link only contains simple text content, it can be converted to a text node + if ( + link.childNodes.length === 1 && + link.childNodes[0].nodeType === this.TEXT_NODE + ) { + var text = this._doc.createTextNode(link.textContent); + link.parentNode.replaceChild(text, link); + } else { + // if the link has multiple children, they should all be preserved + var container = this._doc.createElement("span"); + while (link.firstChild) { + container.appendChild(link.firstChild); + } + link.parentNode.replaceChild(container, link); + } + } else { + link.setAttribute("href", toAbsoluteURI(href)); + } + } + }); + + var medias = this._getAllNodesWithTag(articleContent, [ + "img", + "picture", + "figure", + "video", + "audio", + "source", + ]); + + this._forEachNode(medias, function (media) { + var src = media.getAttribute("src"); + var poster = media.getAttribute("poster"); + var srcset = media.getAttribute("srcset"); + + if (src) { + media.setAttribute("src", toAbsoluteURI(src)); + } + + if (poster) { + media.setAttribute("poster", toAbsoluteURI(poster)); + } + + if (srcset) { + var newSrcset = srcset.replace( + this.REGEXPS.srcsetUrl, + function (_, p1, p2, p3) { + return toAbsoluteURI(p1) + (p2 || "") + p3; + } + ); + + media.setAttribute("srcset", newSrcset); + } + }); + }, + + _simplifyNestedElements(articleContent) { + var node = articleContent; + + while (node) { + if ( + node.parentNode && + ["DIV", "SECTION"].includes(node.tagName) && + !(node.id && node.id.startsWith("readability")) + ) { + if (this._isElementWithoutContent(node)) { + node = this._removeAndGetNext(node); + continue; + } else if ( + this._hasSingleTagInsideElement(node, "DIV") || + this._hasSingleTagInsideElement(node, "SECTION") + ) { + var child = node.children[0]; + for (var i = 0; i < node.attributes.length; i++) { + child.setAttribute( + node.attributes[i].name, + node.attributes[i].value + ); + } + node.parentNode.replaceChild(child, node); + node = child; + continue; + } + } + + node = this._getNextNode(node); + } + }, + + /** + * Get the article title as an H1. + * + * @return string + **/ + _getArticleTitle() { + var doc = this._doc; + var curTitle = ""; + var origTitle = ""; + + try { + curTitle = origTitle = doc.title.trim(); + + // If they had an element with id "title" in their HTML + if (typeof curTitle !== "string") { + curTitle = origTitle = this._getInnerText( + doc.getElementsByTagName("title")[0] + ); + } + } catch (e) { + /* ignore exceptions setting the title. */ + } + + var titleHadHierarchicalSeparators = false; + function wordCount(str) { + return str.split(/\s+/).length; + } + + // If there's a separator in the title, first remove the final part + if (/ [\|\-\\\/>»] /.test(curTitle)) { + titleHadHierarchicalSeparators = / [\\\/>»] /.test(curTitle); + curTitle = origTitle.replace(/(.*)[\|\-\\\/>»] .*/gi, "$1"); + + // If the resulting title is too short, remove the first part instead: + if (wordCount(curTitle) < 3) { + curTitle = origTitle.replace(/[^\|\-\\\/>»]*[\|\-\\\/>»](.*)/gi, "$1"); + } + } else if (curTitle.includes(": ")) { + // Check if we have an heading containing this exact string, so we + // could assume it's the full title. + var headings = this._getAllNodesWithTag(doc, ["h1", "h2"]); + var trimmedTitle = curTitle.trim(); + var match = this._someNode(headings, function (heading) { + return heading.textContent.trim() === trimmedTitle; + }); + + // If we don't, let's extract the title out of the original title string. + if (!match) { + curTitle = origTitle.substring(origTitle.lastIndexOf(":") + 1); + + // If the title is now too short, try the first colon instead: + if (wordCount(curTitle) < 3) { + curTitle = origTitle.substring(origTitle.indexOf(":") + 1); + // But if we have too many words before the colon there's something weird + // with the titles and the H tags so let's just use the original title instead + } else if (wordCount(origTitle.substr(0, origTitle.indexOf(":"))) > 5) { + curTitle = origTitle; + } + } + } else if (curTitle.length > 150 || curTitle.length < 15) { + var hOnes = doc.getElementsByTagName("h1"); + + if (hOnes.length === 1) { + curTitle = this._getInnerText(hOnes[0]); + } + } + + curTitle = curTitle.trim().replace(this.REGEXPS.normalize, " "); + // If we now have 4 words or fewer as our title, and either no + // 'hierarchical' separators (\, /, > or ») were found in the original + // title or we decreased the number of words by more than 1 word, use + // the original title. + var curTitleWordCount = wordCount(curTitle); + if ( + curTitleWordCount <= 4 && + (!titleHadHierarchicalSeparators || + curTitleWordCount != + wordCount(origTitle.replace(/[\|\-\\\/>»]+/g, "")) - 1) + ) { + curTitle = origTitle; + } + + return curTitle; + }, + + /** + * Prepare the HTML document for readability to scrape it. + * This includes things like stripping javascript, CSS, and handling terrible markup. + * + * @return void + **/ + _prepDocument() { + var doc = this._doc; + + // Remove all style tags in head + this._removeNodes(this._getAllNodesWithTag(doc, ["style"])); + + if (doc.body) { + this._replaceBrs(doc.body); + } + + this._replaceNodeTags(this._getAllNodesWithTag(doc, ["font"]), "SPAN"); + }, + + /** + * Finds the next node, starting from the given node, and ignoring + * whitespace in between. If the given node is an element, the same node is + * returned. + */ + _nextNode(node) { + var next = node; + while ( + next && + next.nodeType != this.ELEMENT_NODE && + this.REGEXPS.whitespace.test(next.textContent) + ) { + next = next.nextSibling; + } + return next; + }, + + /** + * Replaces 2 or more successive
elements with a single

. + * Whitespace between
elements are ignored. For example: + *

foo
bar


abc
+ * will become: + *
foo
bar

abc

+ */ + _replaceBrs(elem) { + this._forEachNode(this._getAllNodesWithTag(elem, ["br"]), function (br) { + var next = br.nextSibling; + + // Whether 2 or more
elements have been found and replaced with a + //

block. + var replaced = false; + + // If we find a
chain, remove the
s until we hit another node + // or non-whitespace. This leaves behind the first
in the chain + // (which will be replaced with a

later). + while ((next = this._nextNode(next)) && next.tagName == "BR") { + replaced = true; + var brSibling = next.nextSibling; + next.remove(); + next = brSibling; + } + + // If we removed a
chain, replace the remaining
with a

. Add + // all sibling nodes as children of the

until we hit another
+ // chain. + if (replaced) { + var p = this._doc.createElement("p"); + br.parentNode.replaceChild(p, br); + + next = p.nextSibling; + while (next) { + // If we've hit another

, we're done adding children to this

. + if (next.tagName == "BR") { + var nextElem = this._nextNode(next.nextSibling); + if (nextElem && nextElem.tagName == "BR") { + break; + } + } + + if (!this._isPhrasingContent(next)) { + break; + } + + // Otherwise, make this node a child of the new

. + var sibling = next.nextSibling; + p.appendChild(next); + next = sibling; + } + + while (p.lastChild && this._isWhitespace(p.lastChild)) { + p.lastChild.remove(); + } + + if (p.parentNode.tagName === "P") { + this._setNodeTag(p.parentNode, "DIV"); + } + } + }); + }, + + _setNodeTag(node, tag) { + this.log("_setNodeTag", node, tag); + if (this._docJSDOMParser) { + node.localName = tag.toLowerCase(); + node.tagName = tag.toUpperCase(); + return node; + } + + var replacement = node.ownerDocument.createElement(tag); + while (node.firstChild) { + replacement.appendChild(node.firstChild); + } + node.parentNode.replaceChild(replacement, node); + if (node.readability) { + replacement.readability = node.readability; + } + + for (var i = 0; i < node.attributes.length; i++) { + try { + replacement.setAttribute( + node.attributes[i].name, + node.attributes[i].value + ); + } catch (ex) { + /* it's possible for setAttribute() to throw if the attribute name + * isn't a valid XML Name. Such attributes can however be parsed from + * source in HTML docs, see https://github.com/whatwg/html/issues/4275, + * so we can hit them here and then throw. We don't care about such + * attributes so we ignore them. + */ + } + } + return replacement; + }, + + /** + * Prepare the article node for display. Clean out any inline styles, + * iframes, forms, strip extraneous

tags, etc. + * + * @param Element + * @return void + **/ + _prepArticle(articleContent) { + this._cleanStyles(articleContent); + + // Check for data tables before we continue, to avoid removing items in + // those tables, which will often be isolated even though they're + // visually linked to other content-ful elements (text, images, etc.). + this._markDataTables(articleContent); + + this._fixLazyImages(articleContent); + + // Clean out junk from the article content + this._cleanConditionally(articleContent, "form"); + this._cleanConditionally(articleContent, "fieldset"); + this._clean(articleContent, "object"); + this._clean(articleContent, "embed"); + this._clean(articleContent, "footer"); + this._clean(articleContent, "link"); + this._clean(articleContent, "aside"); + + // Clean out elements with little content that have "share" in their id/class combinations from final top candidates, + // which means we don't remove the top candidates even they have "share". + + var shareElementThreshold = this.DEFAULT_CHAR_THRESHOLD; + + this._forEachNode(articleContent.children, function (topCandidate) { + this._cleanMatchedNodes(topCandidate, function (node, matchString) { + return ( + this.REGEXPS.shareElements.test(matchString) && + node.textContent.length < shareElementThreshold + ); + }); + }); + + this._clean(articleContent, "iframe"); + this._clean(articleContent, "input"); + this._clean(articleContent, "textarea"); + this._clean(articleContent, "select"); + this._clean(articleContent, "button"); + this._cleanHeaders(articleContent); + + // Do these last as the previous stuff may have removed junk + // that will affect these + this._cleanConditionally(articleContent, "table"); + this._cleanConditionally(articleContent, "ul"); + this._cleanConditionally(articleContent, "div"); + + // replace H1 with H2 as H1 should be only title that is displayed separately + this._replaceNodeTags( + this._getAllNodesWithTag(articleContent, ["h1"]), + "h2" + ); + + // Remove extra paragraphs + this._removeNodes( + this._getAllNodesWithTag(articleContent, ["p"]), + function (paragraph) { + // At this point, nasty iframes have been removed; only embedded video + // ones remain. + var contentElementCount = this._getAllNodesWithTag(paragraph, [ + "img", + "embed", + "object", + "iframe", + ]).length; + return ( + contentElementCount === 0 && !this._getInnerText(paragraph, false) + ); + } + ); + + this._forEachNode( + this._getAllNodesWithTag(articleContent, ["br"]), + function (br) { + var next = this._nextNode(br.nextSibling); + if (next && next.tagName == "P") { + br.remove(); + } + } + ); + + // Remove single-cell tables + this._forEachNode( + this._getAllNodesWithTag(articleContent, ["table"]), + function (table) { + var tbody = this._hasSingleTagInsideElement(table, "TBODY") + ? table.firstElementChild + : table; + if (this._hasSingleTagInsideElement(tbody, "TR")) { + var row = tbody.firstElementChild; + if (this._hasSingleTagInsideElement(row, "TD")) { + var cell = row.firstElementChild; + cell = this._setNodeTag( + cell, + this._everyNode(cell.childNodes, this._isPhrasingContent) + ? "P" + : "DIV" + ); + table.parentNode.replaceChild(cell, table); + } + } + } + ); + }, + + /** + * Initialize a node with the readability object. Also checks the + * className/id for special names to add to its score. + * + * @param Element + * @return void + **/ + _initializeNode(node) { + node.readability = { contentScore: 0 }; + + switch (node.tagName) { + case "DIV": + node.readability.contentScore += 5; + break; + + case "PRE": + case "TD": + case "BLOCKQUOTE": + node.readability.contentScore += 3; + break; + + case "ADDRESS": + case "OL": + case "UL": + case "DL": + case "DD": + case "DT": + case "LI": + case "FORM": + node.readability.contentScore -= 3; + break; + + case "H1": + case "H2": + case "H3": + case "H4": + case "H5": + case "H6": + case "TH": + node.readability.contentScore -= 5; + break; + } + + node.readability.contentScore += this._getClassWeight(node); + }, + + _removeAndGetNext(node) { + var nextNode = this._getNextNode(node, true); + node.remove(); + return nextNode; + }, + + /** + * Traverse the DOM from node to node, starting at the node passed in. + * Pass true for the second parameter to indicate this node itself + * (and its kids) are going away, and we want the next node over. + * + * Calling this in a loop will traverse the DOM depth-first. + */ + _getNextNode(node, ignoreSelfAndKids) { + // First check for kids if those aren't being ignored + if (!ignoreSelfAndKids && node.firstElementChild) { + return node.firstElementChild; + } + // Then for siblings... + if (node.nextElementSibling) { + return node.nextElementSibling; + } + // And finally, move up the parent chain *and* find a sibling + // (because this is depth-first traversal, we will have already + // seen the parent nodes themselves). + do { + node = node.parentNode; + } while (node && !node.nextElementSibling); + return node && node.nextElementSibling; + }, + + // compares second text to first one + // 1 = same text, 0 = completely different text + // works the way that it splits both texts into words and then finds words that are unique in second text + // the result is given by the lower length of unique parts + _textSimilarity(textA, textB) { + var tokensA = textA + .toLowerCase() + .split(this.REGEXPS.tokenize) + .filter(Boolean); + var tokensB = textB + .toLowerCase() + .split(this.REGEXPS.tokenize) + .filter(Boolean); + if (!tokensA.length || !tokensB.length) { + return 0; + } + var uniqTokensB = tokensB.filter(token => !tokensA.includes(token)); + var distanceB = uniqTokensB.join(" ").length / tokensB.join(" ").length; + return 1 - distanceB; + }, + + /** + * Checks whether an element node contains a valid byline + * + * @param node {Element} + * @param matchString {string} + * @return boolean + */ + _isValidByline(node, matchString) { + var rel = node.getAttribute("rel"); + var itemprop = node.getAttribute("itemprop"); + var bylineLength = node.textContent.trim().length; + + return ( + (rel === "author" || + (itemprop && itemprop.includes("author")) || + this.REGEXPS.byline.test(matchString)) && + !!bylineLength && + bylineLength < 100 + ); + }, + + _getNodeAncestors(node, maxDepth) { + maxDepth = maxDepth || 0; + var i = 0, + ancestors = []; + while (node.parentNode) { + ancestors.push(node.parentNode); + if (maxDepth && ++i === maxDepth) { + break; + } + node = node.parentNode; + } + return ancestors; + }, + + /*** + * grabArticle - Using a variety of metrics (content score, classname, element types), find the content that is + * most likely to be the stuff a user wants to read. Then return it wrapped up in a div. + * + * @param page a document to run upon. Needs to be a full document, complete with body. + * @return Element + **/ + /* eslint-disable-next-line complexity */ + _grabArticle(page) { + this.log("**** grabArticle ****"); + var doc = this._doc; + var isPaging = page !== null; + page = page ? page : this._doc.body; + + // We can't grab an article if we don't have a page! + if (!page) { + this.log("No body found in document. Abort."); + return null; + } + + var pageCacheHtml = page.innerHTML; + + while (true) { + this.log("Starting grabArticle loop"); + var stripUnlikelyCandidates = this._flagIsActive( + this.FLAG_STRIP_UNLIKELYS + ); + + // First, node prepping. Trash nodes that look cruddy (like ones with the + // class name "comment", etc), and turn divs into P tags where they have been + // used inappropriately (as in, where they contain no other block level elements.) + var elementsToScore = []; + var node = this._doc.documentElement; + + let shouldRemoveTitleHeader = true; + + while (node) { + if (node.tagName === "HTML") { + this._articleLang = node.getAttribute("lang"); + } + + var matchString = node.className + " " + node.id; + + if (!this._isProbablyVisible(node)) { + this.log("Removing hidden node - " + matchString); + node = this._removeAndGetNext(node); + continue; + } + + // User is not able to see elements applied with both "aria-modal = true" and "role = dialog" + if ( + node.getAttribute("aria-modal") == "true" && + node.getAttribute("role") == "dialog" + ) { + node = this._removeAndGetNext(node); + continue; + } + + // If we don't have a byline yet check to see if this node is a byline; if it is store the byline and remove the node. + if ( + !this._articleByline && + !this._metadata.byline && + this._isValidByline(node, matchString) + ) { + this._articleByline = node.textContent.trim(); + node = this._removeAndGetNext(node); + continue; + } + + if (shouldRemoveTitleHeader && this._headerDuplicatesTitle(node)) { + this.log( + "Removing header: ", + node.textContent.trim(), + this._articleTitle.trim() + ); + shouldRemoveTitleHeader = false; + node = this._removeAndGetNext(node); + continue; + } + + // Remove unlikely candidates + if (stripUnlikelyCandidates) { + if ( + this.REGEXPS.unlikelyCandidates.test(matchString) && + !this.REGEXPS.okMaybeItsACandidate.test(matchString) && + !this._hasAncestorTag(node, "table") && + !this._hasAncestorTag(node, "code") && + node.tagName !== "BODY" && + node.tagName !== "A" + ) { + this.log("Removing unlikely candidate - " + matchString); + node = this._removeAndGetNext(node); + continue; + } + + if (this.UNLIKELY_ROLES.includes(node.getAttribute("role"))) { + this.log( + "Removing content with role " + + node.getAttribute("role") + + " - " + + matchString + ); + node = this._removeAndGetNext(node); + continue; + } + } + + // Remove DIV, SECTION, and HEADER nodes without any content(e.g. text, image, video, or iframe). + if ( + (node.tagName === "DIV" || + node.tagName === "SECTION" || + node.tagName === "HEADER" || + node.tagName === "H1" || + node.tagName === "H2" || + node.tagName === "H3" || + node.tagName === "H4" || + node.tagName === "H5" || + node.tagName === "H6") && + this._isElementWithoutContent(node) + ) { + node = this._removeAndGetNext(node); + continue; + } + + if (this.DEFAULT_TAGS_TO_SCORE.includes(node.tagName)) { + elementsToScore.push(node); + } + + // Turn all divs that don't have children block level elements into p's + if (node.tagName === "DIV") { + // Put phrasing content into paragraphs. + var p = null; + var childNode = node.firstChild; + while (childNode) { + var nextSibling = childNode.nextSibling; + if (this._isPhrasingContent(childNode)) { + if (p !== null) { + p.appendChild(childNode); + } else if (!this._isWhitespace(childNode)) { + p = doc.createElement("p"); + node.replaceChild(p, childNode); + p.appendChild(childNode); + } + } else if (p !== null) { + while (p.lastChild && this._isWhitespace(p.lastChild)) { + p.lastChild.remove(); + } + p = null; + } + childNode = nextSibling; + } + + // Sites like http://mobile.slate.com encloses each paragraph with a DIV + // element. DIVs with only a P element inside and no text content can be + // safely converted into plain P elements to avoid confusing the scoring + // algorithm with DIVs with are, in practice, paragraphs. + if ( + this._hasSingleTagInsideElement(node, "P") && + this._getLinkDensity(node) < 0.25 + ) { + var newNode = node.children[0]; + node.parentNode.replaceChild(newNode, node); + node = newNode; + elementsToScore.push(node); + } else if (!this._hasChildBlockElement(node)) { + node = this._setNodeTag(node, "P"); + elementsToScore.push(node); + } + } + node = this._getNextNode(node); + } + + /** + * Loop through all paragraphs, and assign a score to them based on how content-y they look. + * Then add their score to their parent node. + * + * A score is determined by things like number of commas, class names, etc. Maybe eventually link density. + **/ + var candidates = []; + this._forEachNode(elementsToScore, function (elementToScore) { + if ( + !elementToScore.parentNode || + typeof elementToScore.parentNode.tagName === "undefined" + ) { + return; + } + + // If this paragraph is less than 25 characters, don't even count it. + var innerText = this._getInnerText(elementToScore); + if (innerText.length < 25) { + return; + } + + // Exclude nodes with no ancestor. + var ancestors = this._getNodeAncestors(elementToScore, 5); + if (ancestors.length === 0) { + return; + } + + var contentScore = 0; + + // Add a point for the paragraph itself as a base. + contentScore += 1; + + // Add points for any commas within this paragraph. + contentScore += innerText.split(this.REGEXPS.commas).length; + + // For every 100 characters in this paragraph, add another point. Up to 3 points. + contentScore += Math.min(Math.floor(innerText.length / 100), 3); + + // Initialize and score ancestors. + this._forEachNode(ancestors, function (ancestor, level) { + if ( + !ancestor.tagName || + !ancestor.parentNode || + typeof ancestor.parentNode.tagName === "undefined" + ) { + return; + } + + if (typeof ancestor.readability === "undefined") { + this._initializeNode(ancestor); + candidates.push(ancestor); + } + + // Node score divider: + // - parent: 1 (no division) + // - grandparent: 2 + // - great grandparent+: ancestor level * 3 + if (level === 0) { + var scoreDivider = 1; + } else if (level === 1) { + scoreDivider = 2; + } else { + scoreDivider = level * 3; + } + ancestor.readability.contentScore += contentScore / scoreDivider; + }); + }); + + // After we've calculated scores, loop through all of the possible + // candidate nodes we found and find the one with the highest score. + var topCandidates = []; + for (var c = 0, cl = candidates.length; c < cl; c += 1) { + var candidate = candidates[c]; + + // Scale the final candidates score based on link density. Good content + // should have a relatively small link density (5% or less) and be mostly + // unaffected by this operation. + var candidateScore = + candidate.readability.contentScore * + (1 - this._getLinkDensity(candidate)); + candidate.readability.contentScore = candidateScore; + + this.log("Candidate:", candidate, "with score " + candidateScore); + + for (var t = 0; t < this._nbTopCandidates; t++) { + var aTopCandidate = topCandidates[t]; + + if ( + !aTopCandidate || + candidateScore > aTopCandidate.readability.contentScore + ) { + topCandidates.splice(t, 0, candidate); + if (topCandidates.length > this._nbTopCandidates) { + topCandidates.pop(); + } + break; + } + } + } + + var topCandidate = topCandidates[0] || null; + var neededToCreateTopCandidate = false; + var parentOfTopCandidate; + + // If we still have no top candidate, just use the body as a last resort. + // We also have to copy the body node so it is something we can modify. + if (topCandidate === null || topCandidate.tagName === "BODY") { + // Move all of the page's children into topCandidate + topCandidate = doc.createElement("DIV"); + neededToCreateTopCandidate = true; + // Move everything (not just elements, also text nodes etc.) into the container + // so we even include text directly in the body: + while (page.firstChild) { + this.log("Moving child out:", page.firstChild); + topCandidate.appendChild(page.firstChild); + } + + page.appendChild(topCandidate); + + this._initializeNode(topCandidate); + } else if (topCandidate) { + // Find a better top candidate node if it contains (at least three) nodes which belong to `topCandidates` array + // and whose scores are quite closed with current `topCandidate` node. + var alternativeCandidateAncestors = []; + for (var i = 1; i < topCandidates.length; i++) { + if ( + topCandidates[i].readability.contentScore / + topCandidate.readability.contentScore >= + 0.75 + ) { + alternativeCandidateAncestors.push( + this._getNodeAncestors(topCandidates[i]) + ); + } + } + var MINIMUM_TOPCANDIDATES = 3; + if (alternativeCandidateAncestors.length >= MINIMUM_TOPCANDIDATES) { + parentOfTopCandidate = topCandidate.parentNode; + while (parentOfTopCandidate.tagName !== "BODY") { + var listsContainingThisAncestor = 0; + for ( + var ancestorIndex = 0; + ancestorIndex < alternativeCandidateAncestors.length && + listsContainingThisAncestor < MINIMUM_TOPCANDIDATES; + ancestorIndex++ + ) { + listsContainingThisAncestor += Number( + alternativeCandidateAncestors[ancestorIndex].includes( + parentOfTopCandidate + ) + ); + } + if (listsContainingThisAncestor >= MINIMUM_TOPCANDIDATES) { + topCandidate = parentOfTopCandidate; + break; + } + parentOfTopCandidate = parentOfTopCandidate.parentNode; + } + } + if (!topCandidate.readability) { + this._initializeNode(topCandidate); + } + + // Because of our bonus system, parents of candidates might have scores + // themselves. They get half of the node. There won't be nodes with higher + // scores than our topCandidate, but if we see the score going *up* in the first + // few steps up the tree, that's a decent sign that there might be more content + // lurking in other places that we want to unify in. The sibling stuff + // below does some of that - but only if we've looked high enough up the DOM + // tree. + parentOfTopCandidate = topCandidate.parentNode; + var lastScore = topCandidate.readability.contentScore; + // The scores shouldn't get too low. + var scoreThreshold = lastScore / 3; + while (parentOfTopCandidate.tagName !== "BODY") { + if (!parentOfTopCandidate.readability) { + parentOfTopCandidate = parentOfTopCandidate.parentNode; + continue; + } + var parentScore = parentOfTopCandidate.readability.contentScore; + if (parentScore < scoreThreshold) { + break; + } + if (parentScore > lastScore) { + // Alright! We found a better parent to use. + topCandidate = parentOfTopCandidate; + break; + } + lastScore = parentOfTopCandidate.readability.contentScore; + parentOfTopCandidate = parentOfTopCandidate.parentNode; + } + + // If the top candidate is the only child, use parent instead. This will help sibling + // joining logic when adjacent content is actually located in parent's sibling node. + parentOfTopCandidate = topCandidate.parentNode; + while ( + parentOfTopCandidate.tagName != "BODY" && + parentOfTopCandidate.children.length == 1 + ) { + topCandidate = parentOfTopCandidate; + parentOfTopCandidate = topCandidate.parentNode; + } + if (!topCandidate.readability) { + this._initializeNode(topCandidate); + } + } + + // Now that we have the top candidate, look through its siblings for content + // that might also be related. Things like preambles, content split by ads + // that we removed, etc. + var articleContent = doc.createElement("DIV"); + if (isPaging) { + articleContent.id = "readability-content"; + } + + var siblingScoreThreshold = Math.max( + 10, + topCandidate.readability.contentScore * 0.2 + ); + // Keep potential top candidate's parent node to try to get text direction of it later. + parentOfTopCandidate = topCandidate.parentNode; + var siblings = parentOfTopCandidate.children; + + for (var s = 0, sl = siblings.length; s < sl; s++) { + var sibling = siblings[s]; + var append = false; + + this.log( + "Looking at sibling node:", + sibling, + sibling.readability + ? "with score " + sibling.readability.contentScore + : "" + ); + this.log( + "Sibling has score", + sibling.readability ? sibling.readability.contentScore : "Unknown" + ); + + if (sibling === topCandidate) { + append = true; + } else { + var contentBonus = 0; + + // Give a bonus if sibling nodes and top candidates have the example same classname + if ( + sibling.className === topCandidate.className && + topCandidate.className !== "" + ) { + contentBonus += topCandidate.readability.contentScore * 0.2; + } + + if ( + sibling.readability && + sibling.readability.contentScore + contentBonus >= + siblingScoreThreshold + ) { + append = true; + } else if (sibling.nodeName === "P") { + var linkDensity = this._getLinkDensity(sibling); + var nodeContent = this._getInnerText(sibling); + var nodeLength = nodeContent.length; + + if (nodeLength > 80 && linkDensity < 0.25) { + append = true; + } else if ( + nodeLength < 80 && + nodeLength > 0 && + linkDensity === 0 && + nodeContent.search(/\.( |$)/) !== -1 + ) { + append = true; + } + } + } + + if (append) { + this.log("Appending node:", sibling); + + if (!this.ALTER_TO_DIV_EXCEPTIONS.includes(sibling.nodeName)) { + // We have a node that isn't a common block level element, like a form or td tag. + // Turn it into a div so it doesn't get filtered out later by accident. + this.log("Altering sibling:", sibling, "to div."); + + sibling = this._setNodeTag(sibling, "DIV"); + } + + articleContent.appendChild(sibling); + // Fetch children again to make it compatible + // with DOM parsers without live collection support. + siblings = parentOfTopCandidate.children; + // siblings is a reference to the children array, and + // sibling is removed from the array when we call appendChild(). + // As a result, we must revisit this index since the nodes + // have been shifted. + s -= 1; + sl -= 1; + } + } + + if (this._debug) { + this.log("Article content pre-prep: " + articleContent.innerHTML); + } + // So we have all of the content that we need. Now we clean it up for presentation. + this._prepArticle(articleContent); + if (this._debug) { + this.log("Article content post-prep: " + articleContent.innerHTML); + } + + if (neededToCreateTopCandidate) { + // We already created a fake div thing, and there wouldn't have been any siblings left + // for the previous loop, so there's no point trying to create a new div, and then + // move all the children over. Just assign IDs and class names here. No need to append + // because that already happened anyway. + topCandidate.id = "readability-page-1"; + topCandidate.className = "page"; + } else { + var div = doc.createElement("DIV"); + div.id = "readability-page-1"; + div.className = "page"; + while (articleContent.firstChild) { + div.appendChild(articleContent.firstChild); + } + articleContent.appendChild(div); + } + + if (this._debug) { + this.log("Article content after paging: " + articleContent.innerHTML); + } + + var parseSuccessful = true; + + // Now that we've gone through the full algorithm, check to see if + // we got any meaningful content. If we didn't, we may need to re-run + // grabArticle with different flags set. This gives us a higher likelihood of + // finding the content, and the sieve approach gives us a higher likelihood of + // finding the -right- content. + var textLength = this._getInnerText(articleContent, true).length; + if (textLength < this._charThreshold) { + parseSuccessful = false; + // eslint-disable-next-line no-unsanitized/property + page.innerHTML = pageCacheHtml; + + this._attempts.push({ + articleContent, + textLength, + }); + + if (this._flagIsActive(this.FLAG_STRIP_UNLIKELYS)) { + this._removeFlag(this.FLAG_STRIP_UNLIKELYS); + } else if (this._flagIsActive(this.FLAG_WEIGHT_CLASSES)) { + this._removeFlag(this.FLAG_WEIGHT_CLASSES); + } else if (this._flagIsActive(this.FLAG_CLEAN_CONDITIONALLY)) { + this._removeFlag(this.FLAG_CLEAN_CONDITIONALLY); + } else { + // No luck after removing flags, just return the longest text we found during the different loops + this._attempts.sort(function (a, b) { + return b.textLength - a.textLength; + }); + + // But first check if we actually have something + if (!this._attempts[0].textLength) { + return null; + } + + articleContent = this._attempts[0].articleContent; + parseSuccessful = true; + } + } + + if (parseSuccessful) { + // Find out text direction from ancestors of final top candidate. + var ancestors = [parentOfTopCandidate, topCandidate].concat( + this._getNodeAncestors(parentOfTopCandidate) + ); + this._someNode(ancestors, function (ancestor) { + if (!ancestor.tagName) { + return false; + } + var articleDir = ancestor.getAttribute("dir"); + if (articleDir) { + this._articleDir = articleDir; + return true; + } + return false; + }); + return articleContent; + } + } + }, + + /** + * Converts some of the common HTML entities in string to their corresponding characters. + * + * @param str {string} - a string to unescape. + * @return string without HTML entity. + */ + _unescapeHtmlEntities(str) { + if (!str) { + return str; + } + + var htmlEscapeMap = this.HTML_ESCAPE_MAP; + return str + .replace(/&(quot|amp|apos|lt|gt);/g, function (_, tag) { + return htmlEscapeMap[tag]; + }) + .replace(/&#(?:x([0-9a-f]+)|([0-9]+));/gi, function (_, hex, numStr) { + var num = parseInt(hex || numStr, hex ? 16 : 10); + + // these character references are replaced by a conforming HTML parser + if (num == 0 || num > 0x10ffff || (num >= 0xd800 && num <= 0xdfff)) { + num = 0xfffd; + } + + return String.fromCodePoint(num); + }); + }, + + /** + * Try to extract metadata from JSON-LD object. + * For now, only Schema.org objects of type Article or its subtypes are supported. + * @return Object with any metadata that could be extracted (possibly none) + */ + _getJSONLD(doc) { + var scripts = this._getAllNodesWithTag(doc, ["script"]); + + var metadata; + + this._forEachNode(scripts, function (jsonLdElement) { + if ( + !metadata && + jsonLdElement.getAttribute("type") === "application/ld+json" + ) { + try { + // Strip CDATA markers if present + var content = jsonLdElement.textContent.replace( + /^\s*\s*$/g, + "" + ); + var parsed = JSON.parse(content); + if ( + !parsed["@context"] || + !parsed["@context"].match(/^https?\:\/\/schema\.org\/?$/) + ) { + return; + } + + if (!parsed["@type"] && Array.isArray(parsed["@graph"])) { + parsed = parsed["@graph"].find(it => { + return (it["@type"] || "").match(this.REGEXPS.jsonLdArticleTypes); + }); + } + + if ( + !parsed || + !parsed["@type"] || + !parsed["@type"].match(this.REGEXPS.jsonLdArticleTypes) + ) { + return; + } + + metadata = {}; + + if ( + typeof parsed.name === "string" && + typeof parsed.headline === "string" && + parsed.name !== parsed.headline + ) { + // we have both name and headline element in the JSON-LD. They should both be the same but some websites like aktualne.cz + // put their own name into "name" and the article title to "headline" which confuses Readability. So we try to check if either + // "name" or "headline" closely matches the html title, and if so, use that one. If not, then we use "name" by default. + + var title = this._getArticleTitle(); + var nameMatches = this._textSimilarity(parsed.name, title) > 0.75; + var headlineMatches = + this._textSimilarity(parsed.headline, title) > 0.75; + + if (headlineMatches && !nameMatches) { + metadata.title = parsed.headline; + } else { + metadata.title = parsed.name; + } + } else if (typeof parsed.name === "string") { + metadata.title = parsed.name.trim(); + } else if (typeof parsed.headline === "string") { + metadata.title = parsed.headline.trim(); + } + if (parsed.author) { + if (typeof parsed.author.name === "string") { + metadata.byline = parsed.author.name.trim(); + } else if ( + Array.isArray(parsed.author) && + parsed.author[0] && + typeof parsed.author[0].name === "string" + ) { + metadata.byline = parsed.author + .filter(function (author) { + return author && typeof author.name === "string"; + }) + .map(function (author) { + return author.name.trim(); + }) + .join(", "); + } + } + if (typeof parsed.description === "string") { + metadata.excerpt = parsed.description.trim(); + } + if (parsed.publisher && typeof parsed.publisher.name === "string") { + metadata.siteName = parsed.publisher.name.trim(); + } + if (typeof parsed.datePublished === "string") { + metadata.datePublished = parsed.datePublished.trim(); + } + } catch (err) { + this.log(err.message); + } + } + }); + return metadata ? metadata : {}; + }, + + /** + * Attempts to get excerpt and byline metadata for the article. + * + * @param {Object} jsonld — object containing any metadata that + * could be extracted from JSON-LD object. + * + * @return Object with optional "excerpt" and "byline" properties + */ + _getArticleMetadata(jsonld) { + var metadata = {}; + var values = {}; + var metaElements = this._doc.getElementsByTagName("meta"); + + // property is a space-separated list of values + var propertyPattern = + /\s*(article|dc|dcterm|og|twitter)\s*:\s*(author|creator|description|published_time|title|site_name)\s*/gi; + + // name is a single value + var namePattern = + /^\s*(?:(dc|dcterm|og|twitter|parsely|weibo:(article|webpage))\s*[-\.:]\s*)?(author|creator|pub-date|description|title|site_name)\s*$/i; + + // Find description tags. + this._forEachNode(metaElements, function (element) { + var elementName = element.getAttribute("name"); + var elementProperty = element.getAttribute("property"); + var content = element.getAttribute("content"); + if (!content) { + return; + } + var matches = null; + var name = null; + + if (elementProperty) { + matches = elementProperty.match(propertyPattern); + if (matches) { + // Convert to lowercase, and remove any whitespace + // so we can match below. + name = matches[0].toLowerCase().replace(/\s/g, ""); + // multiple authors + values[name] = content.trim(); + } + } + if (!matches && elementName && namePattern.test(elementName)) { + name = elementName; + if (content) { + // Convert to lowercase, remove any whitespace, and convert dots + // to colons so we can match below. + name = name.toLowerCase().replace(/\s/g, "").replace(/\./g, ":"); + values[name] = content.trim(); + } + } + }); + + // get title + metadata.title = + jsonld.title || + values["dc:title"] || + values["dcterm:title"] || + values["og:title"] || + values["weibo:article:title"] || + values["weibo:webpage:title"] || + values.title || + values["twitter:title"] || + values["parsely-title"]; + + if (!metadata.title) { + metadata.title = this._getArticleTitle(); + } + + // get author + metadata.byline = + jsonld.byline || + values["dc:creator"] || + values["dcterm:creator"] || + values.author || + values["parsely-author"]; + + // get description + metadata.excerpt = + jsonld.excerpt || + values["dc:description"] || + values["dcterm:description"] || + values["og:description"] || + values["weibo:article:description"] || + values["weibo:webpage:description"] || + values.description || + values["twitter:description"]; + + // get site name + metadata.siteName = jsonld.siteName || values["og:site_name"]; + + // get article published time + metadata.publishedTime = + jsonld.datePublished || + values["article:published_time"] || + values["parsely-pub-date"] || + null; + + // in many sites the meta value is escaped with HTML entities, + // so here we need to unescape it + metadata.title = this._unescapeHtmlEntities(metadata.title); + metadata.byline = this._unescapeHtmlEntities(metadata.byline); + metadata.excerpt = this._unescapeHtmlEntities(metadata.excerpt); + metadata.siteName = this._unescapeHtmlEntities(metadata.siteName); + metadata.publishedTime = this._unescapeHtmlEntities(metadata.publishedTime); + + return metadata; + }, + + /** + * Check if node is image, or if node contains exactly only one image + * whether as a direct child or as its descendants. + * + * @param Element + **/ + _isSingleImage(node) { + while (node) { + if (node.tagName === "IMG") { + return true; + } + if (node.children.length !== 1 || node.textContent.trim() !== "") { + return false; + } + node = node.children[0]; + } + return false; + }, + + /** + * Find all