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Diffstat (limited to 'app/src/main/assets/Readability.js')
| -rw-r--r-- | app/src/main/assets/Readability.js | 2786 |
1 files changed, 2786 insertions, 0 deletions
diff --git a/app/src/main/assets/Readability.js b/app/src/main/assets/Readability.js new file mode 100644 index 0000000..ad32a65 --- /dev/null +++ b/app/src/main/assets/Readability.js @@ -0,0 +1,2786 @@ +/* + * 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); + } + }, + + /** + * Tests whether a string is a URL or not. + * + * @param {string} str The string to test + * @return {boolean} true if str is a URL, false if not + */ + _isUrl(str) { + try { + new URL(str); + return true; + } catch { + return false; + } + }, + /** + * Converts each <a> and <img> 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.setAttributeNode(node.attributes[i].cloneNode()); + } + 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); + let allSeparators = Array.from(origTitle.matchAll(/ [\|\-\\\/>»] /gi)); + curTitle = origTitle.substring(0, allSeparators.pop().index); + + // If the resulting title is too short, remove the first part instead: + if (wordCount(curTitle) < 3) { + curTitle = origTitle.replace(/^[^\|\-\\\/>»]*[\|\-\\\/>»]/gi, ""); + } + } 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 <br> elements with a single <p>. + * Whitespace between <br> elements are ignored. For example: + * <div>foo<br>bar<br> <br><br>abc</div> + * will become: + * <div>foo<br>bar<p>abc</p></div> + */ + _replaceBrs(elem) { + this._forEachNode(this._getAllNodesWithTag(elem, ["br"]), function (br) { + var next = br.nextSibling; + + // Whether 2 or more <br> elements have been found and replaced with a + // <p> block. + var replaced = false; + + // If we find a <br> chain, remove the <br>s until we hit another node + // or non-whitespace. This leaves behind the first <br> in the chain + // (which will be replaced with a <p> later). + while ((next = this._nextNode(next)) && next.tagName == "BR") { + replaced = true; + var brSibling = next.nextSibling; + next.remove(); + next = brSibling; + } + + // If we removed a <br> chain, replace the remaining <br> with a <p>. Add + // all sibling nodes as children of the <p> until we hit another <br> + // chain. + if (replaced) { + var p = this._doc.createElement("p"); + br.parentNode.replaceChild(p, br); + + next = p.nextSibling; + while (next) { + // If we've hit another <br><br>, we're done adding children to this <p>. + 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 <p>. + 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++) { + replacement.setAttributeNode(node.attributes[i].cloneNode()); + } + return replacement; + }, + + /** + * Prepare the article node for display. Clean out any inline styles, + * iframes, forms, strip extraneous <p> 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. + * + * @param {Element} node + * @param {boolean} ignoreSelfAndKids + * @return {Element} + */ + _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) + ) { + // Find child node matching [itemprop="name"] and use that if it exists for a more accurate author name byline + var endOfSearchMarkerNode = this._getNextNode(node, true); + var next = this._getNextNode(node); + var itemPropNameNode = null; + while (next && next != endOfSearchMarkerNode) { + var itemprop = next.getAttribute("itemprop"); + if (itemprop && itemprop.includes("name")) { + itemPropNameNode = next; + break; + } else { + next = this._getNextNode(next); + } + } + this._articleByline = (itemPropNameNode ?? 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*<!\[CDATA\[|\]\]>\s*$/g, + "" + ); + var parsed = JSON.parse(content); + + if (Array.isArray(parsed)) { + parsed = parsed.find(it => { + return ( + it["@type"] && + it["@type"].match(this.REGEXPS.jsonLdArticleTypes) + ); + }); + if (!parsed) { + return; + } + } + + var schemaDotOrgRegex = /^https?\:\/\/schema\.org\/?$/; + var matches = + (typeof parsed["@context"] === "string" && + parsed["@context"].match(schemaDotOrgRegex)) || + (typeof parsed["@context"] === "object" && + typeof parsed["@context"]["@vocab"] == "string" && + parsed["@context"]["@vocab"].match(schemaDotOrgRegex)); + + if (!matches) { + 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(); + } + + const articleAuthor = + typeof values["article:author"] === "string" && + !this._isUrl(values["article:author"]) + ? values["article:author"] + : undefined; + + // get author + metadata.byline = + jsonld.byline || + values["dc:creator"] || + values["dcterm:creator"] || + values.author || + values["parsely-author"] || + articleAuthor; + + // 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 <noscript> that are located after <img> nodes, and which contain only one + * <img> element. Replace the first image with the image from inside the <noscript> tag, + * and remove the <noscript> tag. This improves the quality of the images we use on + * some sites (e.g. Medium). + * + * @param Element + **/ + _unwrapNoscriptImages(doc) { + // Find img without source or attributes that might contains image, and remove it. + // This is done to prevent a placeholder img is replaced by img from noscript in next step. + var imgs = Array.from(doc.getElementsByTagName("img")); + this._forEachNode(imgs, function (img) { + for (var i = 0; i < img.attributes.length; i++) { + var attr = img.attributes[i]; + switch (attr.name) { + case "src": + case "srcset": + case "data-src": + case "data-srcset": + return; + } + + if (/\.(jpg|jpeg|png|webp)/i.test(attr.value)) { + return; + } + } + + img.remove(); + }); + + // Next find noscript and try to extract its image + var noscripts = Array.from(doc.getElementsByTagName("noscript")); + this._forEachNode(noscripts, function (noscript) { + // Parse content of noscript and make sure it only contains image + if (!this._isSingleImage(noscript)) { + return; + } + var tmp = doc.createElement("div"); + // We're running in the document context, and using unmodified + // document contents, so doing this should be safe. + // (Also we heavily discourage people from allowing script to + // run at all in this document...) + // eslint-disable-next-line no-unsanitized/property + tmp.innerHTML = noscript.innerHTML; + + // If noscript has previous sibling and it only contains image, + // replace it with noscript content. However we also keep old + // attributes that might contains image. + var prevElement = noscript.previousElementSibling; + if (prevElement && this._isSingleImage(prevElement)) { + var prevImg = prevElement; + if (prevImg.tagName !== "IMG") { + prevImg = prevElement.getElementsByTagName("img")[0]; + } + + var newImg = tmp.getElementsByTagName("img")[0]; + for (var i = 0; i < prevImg.attributes.length; i++) { + var attr = prevImg.attributes[i]; + if (attr.value === "") { + continue; + } + + if ( + attr.name === "src" || + attr.name === "srcset" || + /\.(jpg|jpeg|png|webp)/i.test(attr.value) + ) { + if (newImg.getAttribute(attr.name) === attr.value) { + continue; + } + + var attrName = attr.name; + if (newImg.hasAttribute(attrName)) { + attrName = "data-old-" + attrName; + } + + newImg.setAttribute(attrName, attr.value); + } + } + + noscript.parentNode.replaceChild(tmp.firstElementChild, prevElement); + } + }); + }, + + /** + * Removes script tags from the document. + * + * @param Element + **/ + _removeScripts(doc) { + this._removeNodes(this._getAllNodesWithTag(doc, ["script", "noscript"])); + }, + + /** + * Check if this node has only whitespace and a single element with given tag + * Returns false if the DIV node contains non-empty text nodes + * or if it contains no element with given tag or more than 1 element. + * + * @param Element + * @param string tag of child element + **/ + _hasSingleTagInsideElement(element, tag) { + // There should be exactly 1 element child with given tag + if (element.children.length != 1 || element.children[0].tagName !== tag) { + return false; + } + + // And there should be no text nodes with real content + return !this._someNode(element.childNodes, function (node) { + return ( + node.nodeType === this.TEXT_NODE && + this.REGEXPS.hasContent.test(node.textContent) + ); + }); + }, + + _isElementWithoutContent(node) { + return ( + node.nodeType === this.ELEMENT_NODE && + !node.textContent.trim().length && + (!node.children.length || + node.children.length == + node.getElementsByTagName("br").length + + node.getElementsByTagName("hr").length) + ); + }, + + /** + * Determine whether element has any children block level elements. + * + * @param Element + */ + _hasChildBlockElement(element) { + return this._someNode(element.childNodes, function (node) { + return ( + this.DIV_TO_P_ELEMS.has(node.tagName) || + this._hasChildBlockElement(node) + ); + }); + }, + + /*** + * Determine if a node qualifies as phrasing content. + * https://developer.mozilla.org/en-US/docs/Web/Guide/HTML/Content_categories#Phrasing_content + **/ + _isPhrasingContent(node) { + return ( + node.nodeType === this.TEXT_NODE || + this.PHRASING_ELEMS.includes(node.tagName) || + ((node.tagName === "A" || + node.tagName === "DEL" || + node.tagName === "INS") && + this._everyNode(node.childNodes, this._isPhrasingContent)) + ); + }, + + _isWhitespace(node) { + return ( + (node.nodeType === this.TEXT_NODE && + node.textContent.trim().length === 0) || + (node.nodeType === this.ELEMENT_NODE && node.tagName === "BR") + ); + }, + + /** + * Get the inner text of a node - cross browser compatibly. + * This also strips out any excess whitespace to be found. + * + * @param Element + * @param Boolean normalizeSpaces (default: true) + * @return string + **/ + _getInnerText(e, normalizeSpaces) { + normalizeSpaces = + typeof normalizeSpaces === "undefined" ? true : normalizeSpaces; + var textContent = e.textContent.trim(); + + if (normalizeSpaces) { + return textContent.replace(this.REGEXPS.normalize, " "); + } + return textContent; + }, + + /** + * Get the number of times a string s appears in the node e. + * + * @param Element + * @param string - what to split on. Default is "," + * @return number (integer) + **/ + _getCharCount(e, s) { + s = s || ","; + return this._getInnerText(e).split(s).length - 1; + }, + + /** + * Remove the style attribute on every e and under. + * TODO: Test if getElementsByTagName(*) is faster. + * + * @param Element + * @return void + **/ + _cleanStyles(e) { + if (!e || e.tagName.toLowerCase() === "svg") { + return; + } + + // Remove `style` and deprecated presentational attributes + for (var i = 0; i < this.PRESENTATIONAL_ATTRIBUTES.length; i++) { + e.removeAttribute(this.PRESENTATIONAL_ATTRIBUTES[i]); + } + + if (this.DEPRECATED_SIZE_ATTRIBUTE_ELEMS.includes(e.tagName)) { + e.removeAttribute("width"); + e.removeAttribute("height"); + } + + var cur = e.firstElementChild; + while (cur !== null) { + this._cleanStyles(cur); + cur = cur.nextElementSibling; + } + }, + + /** + * Get the density of links as a percentage of the content + * This is the amount of text that is inside a link divided by the total text in the node. + * + * @param Element + * @return number (float) + **/ + _getLinkDensity(element) { + var textLength = this._getInnerText(element).length; + if (textLength === 0) { + return 0; + } + + var linkLength = 0; + + // XXX implement _reduceNodeList? + this._forEachNode(element.getElementsByTagName("a"), function (linkNode) { + var href = linkNode.getAttribute("href"); + var coefficient = href && this.REGEXPS.hashUrl.test(href) ? 0.3 : 1; + linkLength += this._getInnerText(linkNode).length * coefficient; + }); + + return linkLength / textLength; + }, + + /** + * Get an elements class/id weight. Uses regular expressions to tell if this + * element looks good or bad. + * + * @param Element + * @return number (Integer) + **/ + _getClassWeight(e) { + if (!this._flagIsActive(this.FLAG_WEIGHT_CLASSES)) { + return 0; + } + + var weight = 0; + + // Look for a special classname + if (typeof e.className === "string" && e.className !== "") { + if (this.REGEXPS.negative.test(e.className)) { + weight -= 25; + } + + if (this.REGEXPS.positive.test(e.className)) { + weight += 25; + } + } + + // Look for a special ID + if (typeof e.id === "string" && e.id !== "") { + if (this.REGEXPS.negative.test(e.id)) { + weight -= 25; + } + + if (this.REGEXPS.positive.test(e.id)) { + weight += 25; + } + } + + return weight; + }, + + /** + * Clean a node of all elements of type "tag". + * (Unless it's a youtube/vimeo video. People love movies.) + * + * @param Element + * @param string tag to clean + * @return void + **/ + _clean(e, tag) { + var isEmbed = ["object", "embed", "iframe"].includes(tag); + + this._removeNodes(this._getAllNodesWithTag(e, [tag]), function (element) { + // Allow youtube and vimeo videos through as people usually want to see those. + if (isEmbed) { + // First, check the elements attributes to see if any of them contain youtube or vimeo + for (var i = 0; i < element.attributes.length; i++) { + if (this._allowedVideoRegex.test(element.attributes[i].value)) { + return false; + } + } + + // For embed with <object> tag, check inner HTML as well. + if ( + element.tagName === "object" && + this._allowedVideoRegex.test(element.innerHTML) + ) { + return false; + } + } + + return true; + }); + }, + + /** + * Check if a given node has one of its ancestor tag name matching the + * provided one. + * @param HTMLElement node + * @param String tagName + * @param Number maxDepth + * @param Function filterFn a filter to invoke to determine whether this node 'counts' + * @return Boolean + */ + _hasAncestorTag(node, tagName, maxDepth, filterFn) { + maxDepth = maxDepth || 3; + tagName = tagName.toUpperCase(); + var depth = 0; + while (node.parentNode) { + if (maxDepth > 0 && depth > maxDepth) { + return false; + } + if ( + node.parentNode.tagName === tagName && + (!filterFn || filterFn(node.parentNode)) + ) { + return true; + } + node = node.parentNode; + depth++; + } + return false; + }, + + /** + * Return an object indicating how many rows and columns this table has. + */ + _getRowAndColumnCount(table) { + var rows = 0; + var columns = 0; + var trs = table.getElementsByTagName("tr"); + for (var i = 0; i < trs.length; i++) { + var rowspan = trs[i].getAttribute("rowspan") || 0; + if (rowspan) { + rowspan = parseInt(rowspan, 10); + } + rows += rowspan || 1; + + // Now look for column-related info + var columnsInThisRow = 0; + var cells = trs[i].getElementsByTagName("td"); + for (var j = 0; j < cells.length; j++) { + var colspan = cells[j].getAttribute("colspan") || 0; + if (colspan) { + colspan = parseInt(colspan, 10); + } + columnsInThisRow += colspan || 1; + } + columns = Math.max(columns, columnsInThisRow); + } + return { rows, columns }; + }, + + /** + * Look for 'data' (as opposed to 'layout') tables, for which we use + * similar checks as + * https://searchfox.org/mozilla-central/rev/f82d5c549f046cb64ce5602bfd894b7ae807c8f8/accessible/generic/TableAccessible.cpp#19 + */ + _markDataTables(root) { + var tables = root.getElementsByTagName("table"); + for (var i = 0; i < tables.length; i++) { + var table = tables[i]; + var role = table.getAttribute("role"); + if (role == "presentation") { + table._readabilityDataTable = false; + continue; + } + var datatable = table.getAttribute("datatable"); + if (datatable == "0") { + table._readabilityDataTable = false; + continue; + } + var summary = table.getAttribute("summary"); + if (summary) { + table._readabilityDataTable = true; + continue; + } + + var caption = table.getElementsByTagName("caption")[0]; + if (caption && caption.childNodes.length) { + table._readabilityDataTable = true; + continue; + } + + // If the table has a descendant with any of these tags, consider a data table: + var dataTableDescendants = ["col", "colgroup", "tfoot", "thead", "th"]; + var descendantExists = function (tag) { + return !!table.getElementsByTagName(tag)[0]; + }; + if (dataTableDescendants.some(descendantExists)) { + this.log("Data table because found data-y descendant"); + table._readabilityDataTable = true; + continue; + } + + // Nested tables indicate a layout table: + if (table.getElementsByTagName("table")[0]) { + table._readabilityDataTable = false; + continue; + } + + var sizeInfo = this._getRowAndColumnCount(table); + + if (sizeInfo.columns == 1 || sizeInfo.rows == 1) { + // single colum/row tables are commonly used for page layout purposes. + table._readabilityDataTable = false; + continue; + } + + if (sizeInfo.rows >= 10 || sizeInfo.columns > 4) { + table._readabilityDataTable = true; + continue; + } + // Now just go by size entirely: + table._readabilityDataTable = sizeInfo.rows * sizeInfo.columns > 10; + } + }, + + /* convert images and figures that have properties like data-src into images that can be loaded without JS */ + _fixLazyImages(root) { + this._forEachNode( + this._getAllNodesWithTag(root, ["img", "picture", "figure"]), + function (elem) { + // In some sites (e.g. Kotaku), they put 1px square image as base64 data uri in the src attribute. + // So, here we check if the data uri is too short, just might as well remove it. + if (elem.src && this.REGEXPS.b64DataUrl.test(elem.src)) { + // Make sure it's not SVG, because SVG can have a meaningful image in under 133 bytes. + var parts = this.REGEXPS.b64DataUrl.exec(elem.src); + if (parts[1] === "image/svg+xml") { + return; + } + + // Make sure this element has other attributes which contains image. + // If it doesn't, then this src is important and shouldn't be removed. + var srcCouldBeRemoved = false; + for (var i = 0; i < elem.attributes.length; i++) { + var attr = elem.attributes[i]; + if (attr.name === "src") { + continue; + } + + if (/\.(jpg|jpeg|png|webp)/i.test(attr.value)) { + srcCouldBeRemoved = true; + break; + } + } + + // Here we assume if image is less than 100 bytes (or 133 after encoded to base64) + // it will be too small, therefore it might be placeholder image. + if (srcCouldBeRemoved) { + var b64starts = parts[0].length; + var b64length = elem.src.length - b64starts; + if (b64length < 133) { + elem.removeAttribute("src"); + } + } + } + + // also check for "null" to work around https://github.com/jsdom/jsdom/issues/2580 + if ( + (elem.src || (elem.srcset && elem.srcset != "null")) && + !elem.className.toLowerCase().includes("lazy") + ) { + return; + } + + for (var j = 0; j < elem.attributes.length; j++) { + attr = elem.attributes[j]; + if ( + attr.name === "src" || + attr.name === "srcset" || + attr.name === "alt" + ) { + continue; + } + var copyTo = null; + if (/\.(jpg|jpeg|png|webp)\s+\d/.test(attr.value)) { + copyTo = "srcset"; + } else if (/^\s*\S+\.(jpg|jpeg|png|webp)\S*\s*$/.test(attr.value)) { + copyTo = "src"; + } + if (copyTo) { + //if this is an img or picture, set the attribute directly + if (elem.tagName === "IMG" || elem.tagName === "PICTURE") { + elem.setAttribute(copyTo, attr.value); + } else if ( + elem.tagName === "FIGURE" && + !this._getAllNodesWithTag(elem, ["img", "picture"]).length + ) { + //if the item is a <figure> that does not contain an image or picture, create one and place it inside the figure + //see the nytimes-3 testcase for an example + var img = this._doc.createElement("img"); + img.setAttribute(copyTo, attr.value); + elem.appendChild(img); + } + } + } + } + ); + }, + + _getTextDensity(e, tags) { + var textLength = this._getInnerText(e, true).length; + if (textLength === 0) { + return 0; + } + var childrenLength = 0; + var children = this._getAllNodesWithTag(e, tags); + this._forEachNode( + children, + child => (childrenLength += this._getInnerText(child, true).length) + ); + return childrenLength / textLength; + }, + + /** + * Clean an element of all tags of type "tag" if they look fishy. + * "Fishy" is an algorithm based on content length, classnames, link density, number of images & embeds, etc. + * + * @return void + **/ + _cleanConditionally(e, tag) { + if (!this._flagIsActive(this.FLAG_CLEAN_CONDITIONALLY)) { + return; + } + + // Gather counts for other typical elements embedded within. + // Traverse backwards so we can remove nodes at the same time + // without effecting the traversal. + // + // TODO: Consider taking into account original contentScore here. + this._removeNodes(this._getAllNodesWithTag(e, [tag]), function (node) { + // First check if this node IS data table, in which case don't remove it. + var isDataTable = function (t) { + return t._readabilityDataTable; + }; + + var isList = tag === "ul" || tag === "ol"; + if (!isList) { + var listLength = 0; + var listNodes = this._getAllNodesWithTag(node, ["ul", "ol"]); + this._forEachNode( + listNodes, + list => (listLength += this._getInnerText(list).length) + ); + isList = listLength / this._getInnerText(node).length > 0.9; + } + + if (tag === "table" && isDataTable(node)) { + return false; + } + + // Next check if we're inside a data table, in which case don't remove it as well. + if (this._hasAncestorTag(node, "table", -1, isDataTable)) { + return false; + } + + if (this._hasAncestorTag(node, "code")) { + return false; + } + + // keep element if it has a data tables + if ( + [...node.getElementsByTagName("table")].some( + tbl => tbl._readabilityDataTable + ) + ) { + return false; + } + + var weight = this._getClassWeight(node); + + this.log("Cleaning Conditionally", node); + + var contentScore = 0; + + if (weight + contentScore < 0) { + return true; + } + + if (this._getCharCount(node, ",") < 10) { + // If there are not very many commas, and the number of + // non-paragraph elements is more than paragraphs or other + // ominous signs, remove the element. + var p = node.getElementsByTagName("p").length; + var img = node.getElementsByTagName("img").length; + var li = node.getElementsByTagName("li").length - 100; + var input = node.getElementsByTagName("input").length; + var headingDensity = this._getTextDensity(node, [ + "h1", + "h2", + "h3", + "h4", + "h5", + "h6", + ]); + + var embedCount = 0; + var embeds = this._getAllNodesWithTag(node, [ + "object", + "embed", + "iframe", + ]); + + for (var i = 0; i < embeds.length; i++) { + // If this embed has attribute that matches video regex, don't delete it. + for (var j = 0; j < embeds[i].attributes.length; j++) { + if (this._allowedVideoRegex.test(embeds[i].attributes[j].value)) { + return false; + } + } + + // For embed with <object> tag, check inner HTML as well. + if ( + embeds[i].tagName === "object" && + this._allowedVideoRegex.test(embeds[i].innerHTML) + ) { + return false; + } + + embedCount++; + } + + var innerText = this._getInnerText(node); + + // toss any node whose inner text contains nothing but suspicious words + if ( + this.REGEXPS.adWords.test(innerText) || + this.REGEXPS.loadingWords.test(innerText) + ) { + return true; + } + + var contentLength = innerText.length; + var linkDensity = this._getLinkDensity(node); + var textishTags = ["SPAN", "LI", "TD"].concat( + Array.from(this.DIV_TO_P_ELEMS) + ); + var textDensity = this._getTextDensity(node, textishTags); + var isFigureChild = this._hasAncestorTag(node, "figure"); + + // apply shadiness checks, then check for exceptions + const shouldRemoveNode = () => { + const errs = []; + if (!isFigureChild && img > 1 && p / img < 0.5) { + errs.push(`Bad p to img ratio (img=${img}, p=${p})`); + } + if (!isList && li > p) { + errs.push(`Too many li's outside of a list. (li=${li} > p=${p})`); + } + if (input > Math.floor(p / 3)) { + errs.push(`Too many inputs per p. (input=${input}, p=${p})`); + } + if ( + !isList && + !isFigureChild && + headingDensity < 0.9 && + contentLength < 25 && + (img === 0 || img > 2) && + linkDensity > 0 + ) { + errs.push( + `Suspiciously short. (headingDensity=${headingDensity}, img=${img}, linkDensity=${linkDensity})` + ); + } + if ( + !isList && + weight < 25 && + linkDensity > 0.2 + this._linkDensityModifier + ) { + errs.push( + `Low weight and a little linky. (linkDensity=${linkDensity})` + ); + } + if (weight >= 25 && linkDensity > 0.5 + this._linkDensityModifier) { + errs.push( + `High weight and mostly links. (linkDensity=${linkDensity})` + ); + } + if ((embedCount === 1 && contentLength < 75) || embedCount > 1) { + errs.push( + `Suspicious embed. (embedCount=${embedCount}, contentLength=${contentLength})` + ); + } + if (img === 0 && textDensity === 0) { + errs.push( + `No useful content. (img=${img}, textDensity=${textDensity})` + ); + } + + if (errs.length) { + this.log("Checks failed", errs); + return true; + } + + return false; + }; + + var haveToRemove = shouldRemoveNode(); + + // Allow simple lists of images to remain in pages + if (isList && haveToRemove) { + for (var x = 0; x < node.children.length; x++) { + let child = node.children[x]; + // Don't filter in lists with li's that contain more than one child + if (child.children.length > 1) { + return haveToRemove; + } + } + let li_count = node.getElementsByTagName("li").length; + // Only allow the list to remain if every li contains an image + if (img == li_count) { + return false; + } + } + return haveToRemove; + } + return false; + }); + }, + + /** + * Clean out elements that match the specified conditions + * + * @param Element + * @param Function determines whether a node should be removed + * @return void + **/ + _cleanMatchedNodes(e, filter) { + var endOfSearchMarkerNode = this._getNextNode(e, true); + var next = this._getNextNode(e); + while (next && next != endOfSearchMarkerNode) { + if (filter.call(this, next, next.className + " " + next.id)) { + next = this._removeAndGetNext(next); + } else { + next = this._getNextNode(next); + } + } + }, + + /** + * Clean out spurious headers from an Element. + * + * @param Element + * @return void + **/ + _cleanHeaders(e) { + let headingNodes = this._getAllNodesWithTag(e, ["h1", "h2"]); + this._removeNodes(headingNodes, function (node) { + let shouldRemove = this._getClassWeight(node) < 0; + if (shouldRemove) { + this.log("Removing header with low class weight:", node); + } + return shouldRemove; + }); + }, + + /** + * Check if this node is an H1 or H2 element whose content is mostly + * the same as the article title. + * + * @param Element the node to check. + * @return boolean indicating whether this is a title-like header. + */ + _headerDuplicatesTitle(node) { + if (node.tagName != "H1" && node.tagName != "H2") { + return false; + } + var heading = this._getInnerText(node, false); + this.log("Evaluating similarity of header:", heading, this._articleTitle); + return this._textSimilarity(this._articleTitle, heading) > 0.75; + }, + + _flagIsActive(flag) { + return (this._flags & flag) > 0; + }, + + _removeFlag(flag) { + this._flags = this._flags & ~flag; + }, + + _isProbablyVisible(node) { + // Have to null-check node.style and node.className.includes to deal with SVG and MathML nodes. + return ( + (!node.style || node.style.display != "none") && + (!node.style || node.style.visibility != "hidden") && + !node.hasAttribute("hidden") && + //check for "fallback-image" so that wikimedia math images are displayed + (!node.hasAttribute("aria-hidden") || + node.getAttribute("aria-hidden") != "true" || + (node.className && + node.className.includes && + node.className.includes("fallback-image"))) + ); + }, + + /** + * Runs readability. + * + * Workflow: + * 1. Prep the document by removing script tags, css, etc. + * 2. Build readability's DOM tree. + * 3. Grab the article content from the current dom tree. + * 4. Replace the current DOM tree with the new one. + * 5. Read peacefully. + * + * @return void + **/ + parse() { + // Avoid parsing too large documents, as per configuration option + if (this._maxElemsToParse > 0) { + var numTags = this._doc.getElementsByTagName("*").length; + if (numTags > this._maxElemsToParse) { + throw new Error( + "Aborting parsing document; " + numTags + " elements found" + ); + } + } + + // Unwrap image from noscript + this._unwrapNoscriptImages(this._doc); + + // Extract JSON-LD metadata before removing scripts + var jsonLd = this._disableJSONLD ? {} : this._getJSONLD(this._doc); + + // Remove script tags from the document. + this._removeScripts(this._doc); + + this._prepDocument(); + + var metadata = this._getArticleMetadata(jsonLd); + this._metadata = metadata; + this._articleTitle = metadata.title; + + var articleContent = this._grabArticle(); + if (!articleContent) { + return null; + } + + this.log("Grabbed: " + articleContent.innerHTML); + + this._postProcessContent(articleContent); + + // If we haven't found an excerpt in the article's metadata, use the article's + // first paragraph as the excerpt. This is used for displaying a preview of + // the article's content. + if (!metadata.excerpt) { + var paragraphs = articleContent.getElementsByTagName("p"); + if (paragraphs.length) { + metadata.excerpt = paragraphs[0].textContent.trim(); + } + } + + var textContent = articleContent.textContent; + return { + title: this._articleTitle, + byline: metadata.byline || this._articleByline, + dir: this._articleDir, + lang: this._articleLang, + content: this._serializer(articleContent), + textContent, + length: textContent.length, + excerpt: metadata.excerpt, + siteName: metadata.siteName || this._articleSiteName, + publishedTime: metadata.publishedTime, + }; + }, +}; + +if (typeof module === "object") { + /* eslint-disable-next-line no-redeclare */ + /* global module */ + module.exports = Readability; +} |