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- /*eslint-env es6:false*/
- /*
- * 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 = [];
- // 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;
- // 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 dump !== "undefined") {
- var msg = Array.prototype.map.call(arguments, function(x) {
- return (x && x.nodeName) ? logNode(x) : x;
- }).join(" ");
- dump("Reader: (Readability) " + msg + "\n");
- } else 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)");
- console.log.apply(console, args);
- }
- };
- } 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$| hid |^hid |banner|combx|comment|com-|contact|foot|footer|footnote|gdpr|masthead|media|meta|outbrain|promo|related|scroll|share|shoutbox|sidebar|skyscraper|sponsor|shopping|tags|tool|widget/i,
- extraneous: /print|archive|comment|discuss|e[\-]?mail|share|reply|all|login|sign|single|utility/i,
- byline: /byline|author|dateline|writtenby|p-author/i,
- replaceFonts: /<(\/?)font[^>]*>/gi,
- normalize: /\s{2,}/g,
- videos: /\/\/(www\.)?((dailymotion|youtube|youtube-nocookie|player\.vimeo|v\.qq)\.com|(archive|upload\.wikimedia)\.org|player\.twitch\.tv)/i,
- shareElements: /(\b|_)(share|sharedaddy)(\b|_)/i,
- nextLink: /(next|weiter|continue|>([^\|]|$)|»([^\|]|$))/i,
- prevLink: /(prev|earl|old|new|<|«)/i,
- tokenize: /\W+/g,
- whitespace: /^\s*$/,
- hasContent: /\S$/,
- hashUrl: /^#.+/,
- srcsetUrl: /(\S+)(\s+[\d.]+[xw])?(\s*(?:,|$))/g,
- b64DataUrl: /^data:\s*([^\s;,]+)\s*;\s*base64\s*,/i,
- // 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$/
- },
- 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"],
- 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: function(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: function(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: function(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: function(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: function(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: function(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: function(nodeList, fn) {
- return Array.prototype.every.call(nodeList, fn, this);
- },
- /**
- * Concat all nodelists passed as arguments.
- *
- * @return ...NodeList
- * @return Array
- */
- _concatNodeLists: function() {
- var slice = Array.prototype.slice;
- var args = slice.call(arguments);
- var nodeLists = args.map(function(list) {
- return slice.call(list);
- });
- return Array.prototype.concat.apply([], nodeLists);
- },
- _getAllNodesWithTag: function(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: function(node) {
- var classesToPreserve = this._classesToPreserve;
- var className = (node.getAttribute("class") || "")
- .split(/\s+/)
- .filter(function(cls) {
- return classesToPreserve.indexOf(cls) != -1;
- })
- .join(" ");
- if (className) {
- node.setAttribute("class", className);
- } else {
- node.removeAttribute("class");
- }
- for (node = node.firstElementChild; node; node = node.nextElementSibling) {
- this._cleanClasses(node);
- }
- },
- /**
- * Converts each <a> and <img> uri in the given element to an absolute URI,
- * ignoring #ref URIs.
- *
- * @param Element
- * @return void
- */
- _fixRelativeUris: function(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: function(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: function() {
- 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 (3 words or fewer), remove
- // the first part instead:
- if (wordCount(curTitle) < 3)
- curTitle = origTitle.replace(/[^\|\-\\\/>»]*[\|\-\\\/>»](.*)/gi, "$1");
- } else if (curTitle.indexOf(": ") !== -1) {
- // Check if we have an heading containing this exact string, so we
- // could assume it's the full title.
- var headings = this._concatNodeLists(
- doc.getElementsByTagName("h1"),
- doc.getElementsByTagName("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: function() {
- 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: function (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: function (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.parentNode.removeChild(next);
- 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.removeChild(p.lastChild);
- }
- if (p.parentNode.tagName === "P")
- this._setNodeTag(p.parentNode, "DIV");
- }
- });
- },
- _setNodeTag: function (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 <p> tags, etc.
- *
- * @param Element
- * @return void
- **/
- _prepArticle: function(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) {
- var imgCount = paragraph.getElementsByTagName("img").length;
- var embedCount = paragraph.getElementsByTagName("embed").length;
- var objectCount = paragraph.getElementsByTagName("object").length;
- // At this point, nasty iframes have been removed, only remain embedded video ones.
- var iframeCount = paragraph.getElementsByTagName("iframe").length;
- var totalCount = imgCount + embedCount + objectCount + iframeCount;
- return totalCount === 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.parentNode.removeChild(br);
- });
- // 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: function(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: function(node) {
- var nextNode = this._getNextNode(node, true);
- node.parentNode.removeChild(node);
- 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: function(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: function(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;
- },
- _checkByline: function(node, matchString) {
- if (this._articleByline) {
- return false;
- }
- if (node.getAttribute !== undefined) {
- var rel = node.getAttribute("rel");
- var itemprop = node.getAttribute("itemprop");
- }
- if ((rel === "author" || (itemprop && itemprop.indexOf("author") !== -1) || this.REGEXPS.byline.test(matchString)) && this._isValidByline(node.textContent)) {
- this._articleByline = node.textContent.trim();
- return true;
- }
- return false;
- },
- _getNodeAncestors: function(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
- **/
- _grabArticle: function (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;
- }
- // Check to see if this node is a byline, and remove it if it is.
- if (this._checkByline(node, matchString)) {
- 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.indexOf(node.tagName) !== -1) {
- 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.removeChild(p.lastChild);
- }
- 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(",").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.indexOf(sibling.nodeName) === -1) {
- // 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;
- page.innerHTML = pageCacheHtml;
- if (this._flagIsActive(this.FLAG_STRIP_UNLIKELYS)) {
- this._removeFlag(this.FLAG_STRIP_UNLIKELYS);
- this._attempts.push({articleContent: articleContent, textLength: textLength});
- } else if (this._flagIsActive(this.FLAG_WEIGHT_CLASSES)) {
- this._removeFlag(this.FLAG_WEIGHT_CLASSES);
- this._attempts.push({articleContent: articleContent, textLength: textLength});
- } else if (this._flagIsActive(this.FLAG_CLEAN_CONDITIONALLY)) {
- this._removeFlag(this.FLAG_CLEAN_CONDITIONALLY);
- this._attempts.push({articleContent: articleContent, textLength: textLength});
- } else {
- this._attempts.push({articleContent: articleContent, textLength: textLength});
- // 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;
- }
- }
- },
- /**
- * Check whether the input string could be a byline.
- * This verifies that the input is a string, and that the length
- * is less than 100 chars.
- *
- * @param possibleByline {string} - a string to check whether its a byline.
- * @return Boolean - whether the input string is a byline.
- */
- _isValidByline: function(byline) {
- if (typeof byline == "string" || byline instanceof String) {
- byline = byline.trim();
- return (byline.length > 0) && (byline.length < 100);
- }
- return false;
- },
- /**
- * 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: function(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-z]{1,4})|([0-9]{1,4}));/gi, function(_, hex, numStr) {
- var num = parseInt(hex || numStr, hex ? 16 : 10);
- return String.fromCharCode(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: function (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*$/g, "");
- var parsed = JSON.parse(content);
- if (
- !parsed["@context"] ||
- !parsed["@context"].match(/^https?\:\/\/schema\.org$/)
- ) {
- return;
- }
- if (!parsed["@type"] && Array.isArray(parsed["@graph"])) {
- parsed = parsed["@graph"].find(function(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();
- }
- return;
- } 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: function(jsonld) {
- var metadata = {};
- var values = {};
- var metaElements = this._doc.getElementsByTagName("meta");
- // property is a space-separated list of values
- var propertyPattern = /\s*(dc|dcterm|og|twitter)\s*:\s*(author|creator|description|title|site_name)\s*/gi;
- // name is a single value
- var namePattern = /^\s*(?:(dc|dcterm|og|twitter|weibo:(article|webpage))\s*[\.:]\s*)?(author|creator|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"];
- if (!metadata.title) {
- metadata.title = this._getArticleTitle();
- }
- // get author
- metadata.byline = jsonld.byline ||
- values["dc:creator"] ||
- values["dcterm:creator"] ||
- values["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"];
- // 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);
- 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: function(node) {
- if (node.tagName === "IMG") {
- return true;
- }
- if (node.children.length !== 1 || node.textContent.trim() !== "") {
- return false;
- }
- return this._isSingleImage(node.children[0]);
- },
- /**
- * 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: function(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.parentNode.removeChild(img);
- });
- // 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
- var tmp = doc.createElement("div");
- tmp.innerHTML = noscript.innerHTML;
- if (!this._isSingleImage(tmp)) {
- return;
- }
- // 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: function(doc) {
- this._removeNodes(this._getAllNodesWithTag(doc, ["script"]), function(scriptNode) {
- scriptNode.nodeValue = "";
- scriptNode.removeAttribute("src");
- return true;
- });
- this._removeNodes(this._getAllNodesWithTag(doc, ["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: function(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: function(node) {
- return node.nodeType === this.ELEMENT_NODE &&
- node.textContent.trim().length == 0 &&
- (node.children.length == 0 ||
- node.children.length == node.getElementsByTagName("br").length + node.getElementsByTagName("hr").length);
- },
- /**
- * Determine whether element has any children block level elements.
- *
- * @param Element
- */
- _hasChildBlockElement: function (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: function(node) {
- return node.nodeType === this.TEXT_NODE || this.PHRASING_ELEMS.indexOf(node.tagName) !== -1 ||
- ((node.tagName === "A" || node.tagName === "DEL" || node.tagName === "INS") &&
- this._everyNode(node.childNodes, this._isPhrasingContent));
- },
- _isWhitespace: function(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: function(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: function(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: function(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.indexOf(e.tagName) !== -1) {
- 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: function(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: function(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: function(e, tag) {
- var isEmbed = ["object", "embed", "iframe"].indexOf(tag) !== -1;
- 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.REGEXPS.videos.test(element.attributes[i].value)) {
- return false;
- }
- }
- // For embed with <object> tag, check inner HTML as well.
- if (element.tagName === "object" && this.REGEXPS.videos.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: function(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: function(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: rows, columns: 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: function(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 > 0) {
- 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.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: function (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 133B after encoded to base64)
- // it will be too small, therefore it might be placeholder image.
- if (srcCouldBeRemoved) {
- var b64starts = elem.src.search(/base64\s*/i) + 7;
- 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().indexOf("lazy") === -1) {
- 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: function(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: function(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;
- }
- 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.REGEXPS.videos.test(embeds[i].attributes[j].value)) {
- return false;
- }
- }
- // For embed with <object> tag, check inner HTML as well.
- if (embeds[i].tagName === "object" && this.REGEXPS.videos.test(embeds[i].innerHTML)) {
- return false;
- }
- embedCount++;
- }
- var linkDensity = this._getLinkDensity(node);
- var contentLength = this._getInnerText(node).length;
- var haveToRemove =
- (img > 1 && p / img < 0.5 && !this._hasAncestorTag(node, "figure")) ||
- (!isList && li > p) ||
- (input > Math.floor(p/3)) ||
- (!isList && headingDensity < 0.9 && contentLength < 25 && (img === 0 || img > 2) && !this._hasAncestorTag(node, "figure")) ||
- (!isList && weight < 25 && linkDensity > 0.2) ||
- (weight >= 25 && linkDensity > 0.5) ||
- ((embedCount === 1 && contentLength < 75) || embedCount > 1);
- 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: function(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: function(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: function(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: function(flag) {
- return (this._flags & flag) > 0;
- },
- _removeFlag: function(flag) {
- this._flags = this._flags & ~flag;
- },
- _isProbablyVisible: function(node) {
- // Have to null-check node.style and node.className.indexOf to deal with SVG and MathML nodes.
- return (!node.style || node.style.display != "none")
- && !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.indexOf && node.className.indexOf("fallback-image") !== -1));
- },
- /**
- * 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: function () {
- // 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._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 > 0) {
- 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: textContent,
- length: textContent.length,
- excerpt: metadata.excerpt,
- siteName: metadata.siteName || this._articleSiteName
- };
- }
- };
- function main() {
- let reader = new Readability(document.cloneNode(true));
- let article = reader.parse();
- let body = `<!doctype html><head><meta charset="${document.characterSet}"><title>${article.title}</title></head><body><h1>${article.title}</h1>${article.content}</body></html>`;
- let result = {
- "body": body,
- "url": window.location.toString(),
- "baseurl": window.location.protocol + "//" + window.location.origin
- };
- return result;
- }
- main();
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