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@@ -0,0 +1,2293 @@
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+/*eslint-env es6:false*/
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+/*
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+ * Copyright (c) 2010 Arc90 Inc
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+ *
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+ * Licensed under the Apache License, Version 2.0 (the "License");
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+ * you may not use this file except in compliance with the License.
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+ * You may obtain a copy of the License at
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+ *
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+ * http://www.apache.org/licenses/LICENSE-2.0
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+ *
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+ * Unless required by applicable law or agreed to in writing, software
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+ * distributed under the License is distributed on an "AS IS" BASIS,
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+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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+ * See the License for the specific language governing permissions and
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+ * limitations under the License.
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+ */
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+
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+/*
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+ * This code is heavily based on Arc90's readability.js (1.7.1) script
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+ * available at: http://code.google.com/p/arc90labs-readability
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+ */
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+
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+/**
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+ * Public constructor.
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+ * @param {HTMLDocument} doc The document to parse.
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+ * @param {Object} options The options object.
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+ */
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+function Readability(doc, options) {
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+ // In some older versions, people passed a URI as the first argument. Cope:
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+ if (options && options.documentElement) {
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+ doc = options;
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+ options = arguments[2];
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+ } else if (!doc || !doc.documentElement) {
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+ throw new Error("First argument to Readability constructor should be a document object.");
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+ }
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+ options = options || {};
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+
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+ this._doc = doc;
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+ this._docJSDOMParser = this._doc.firstChild.__JSDOMParser__;
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+ this._articleTitle = null;
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+ this._articleByline = null;
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+ this._articleDir = null;
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+ this._articleSiteName = null;
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+ this._attempts = [];
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+
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+ // Configurable options
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+ this._debug = !!options.debug;
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+ this._maxElemsToParse = options.maxElemsToParse || this.DEFAULT_MAX_ELEMS_TO_PARSE;
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+ this._nbTopCandidates = options.nbTopCandidates || this.DEFAULT_N_TOP_CANDIDATES;
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+ this._charThreshold = options.charThreshold || this.DEFAULT_CHAR_THRESHOLD;
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+ this._classesToPreserve = this.CLASSES_TO_PRESERVE.concat(options.classesToPreserve || []);
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+ this._keepClasses = !!options.keepClasses;
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+ this._serializer = options.serializer || function(el) {
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+ return el.innerHTML;
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+ };
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+ this._disableJSONLD = !!options.disableJSONLD;
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+
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+ // Start with all flags set
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+ this._flags = this.FLAG_STRIP_UNLIKELYS |
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+ this.FLAG_WEIGHT_CLASSES |
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+ this.FLAG_CLEAN_CONDITIONALLY;
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+
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+
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+ // Control whether log messages are sent to the console
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+ if (this._debug) {
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+ let logNode = function(node) {
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+ if (node.nodeType == node.TEXT_NODE) {
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+ return `${node.nodeName} ("${node.textContent}")`;
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+ }
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+ let attrPairs = Array.from(node.attributes || [], function(attr) {
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+ return `${attr.name}="${attr.value}"`;
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+ }).join(" ");
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+ return `<${node.localName} ${attrPairs}>`;
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+ };
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+ this.log = function () {
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+ if (typeof dump !== "undefined") {
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+ var msg = Array.prototype.map.call(arguments, function(x) {
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+ return (x && x.nodeName) ? logNode(x) : x;
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+ }).join(" ");
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+ dump("Reader: (Readability) " + msg + "\n");
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+ } else if (typeof console !== "undefined") {
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+ let args = Array.from(arguments, arg => {
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+ if (arg && arg.nodeType == this.ELEMENT_NODE) {
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+ return logNode(arg);
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+ }
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+ return arg;
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+ });
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+ args.unshift("Reader: (Readability)");
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+ console.log.apply(console, args);
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+ }
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+ };
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+ } else {
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+ this.log = function () {};
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+ }
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+}
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+
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+Readability.prototype = {
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+ FLAG_STRIP_UNLIKELYS: 0x1,
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+ FLAG_WEIGHT_CLASSES: 0x2,
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+ FLAG_CLEAN_CONDITIONALLY: 0x4,
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+
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+ // https://developer.mozilla.org/en-US/docs/Web/API/Node/nodeType
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+ ELEMENT_NODE: 1,
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+ TEXT_NODE: 3,
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+
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+ // Max number of nodes supported by this parser. Default: 0 (no limit)
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+ DEFAULT_MAX_ELEMS_TO_PARSE: 0,
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+
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+ // The number of top candidates to consider when analysing how
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+ // tight the competition is among candidates.
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+ DEFAULT_N_TOP_CANDIDATES: 5,
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+
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+ // Element tags to score by default.
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+ DEFAULT_TAGS_TO_SCORE: "section,h2,h3,h4,h5,h6,p,td,pre".toUpperCase().split(","),
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+
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+ // The default number of chars an article must have in order to return a result
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+ DEFAULT_CHAR_THRESHOLD: 500,
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+
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+ // All of the regular expressions in use within readability.
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+ // Defined up here so we don't instantiate them repeatedly in loops.
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+ REGEXPS: {
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+ // NOTE: These two regular expressions are duplicated in
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+ // Readability-readerable.js. Please keep both copies in sync.
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+ 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,
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+ okMaybeItsACandidate: /and|article|body|column|content|main|shadow/i,
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+
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+ positive: /article|body|content|entry|hentry|h-entry|main|page|pagination|post|text|blog|story/i,
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+ negative: /-ad-|hidden|^hid$| hid$| hid |^hid |banner|combx|comment|com-|contact|foot|footer|footnote|gdpr|masthead|media|meta|outbrain|promo|related|scroll|share|shoutbox|sidebar|skyscraper|sponsor|shopping|tags|tool|widget/i,
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+ extraneous: /print|archive|comment|discuss|e[\-]?mail|share|reply|all|login|sign|single|utility/i,
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+ byline: /byline|author|dateline|writtenby|p-author/i,
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+ replaceFonts: /<(\/?)font[^>]*>/gi,
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+ normalize: /\s{2,}/g,
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+ videos: /\/\/(www\.)?((dailymotion|youtube|youtube-nocookie|player\.vimeo|v\.qq)\.com|(archive|upload\.wikimedia)\.org|player\.twitch\.tv)/i,
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+ shareElements: /(\b|_)(share|sharedaddy)(\b|_)/i,
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+ nextLink: /(next|weiter|continue|>([^\|]|$)|»([^\|]|$))/i,
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+ prevLink: /(prev|earl|old|new|<|«)/i,
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+ tokenize: /\W+/g,
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+ whitespace: /^\s*$/,
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+ hasContent: /\S$/,
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+ hashUrl: /^#.+/,
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+ srcsetUrl: /(\S+)(\s+[\d.]+[xw])?(\s*(?:,|$))/g,
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+ b64DataUrl: /^data:\s*([^\s;,]+)\s*;\s*base64\s*,/i,
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+ // See: https://schema.org/Article
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+ jsonLdArticleTypes: /^Article|AdvertiserContentArticle|NewsArticle|AnalysisNewsArticle|AskPublicNewsArticle|BackgroundNewsArticle|OpinionNewsArticle|ReportageNewsArticle|ReviewNewsArticle|Report|SatiricalArticle|ScholarlyArticle|MedicalScholarlyArticle|SocialMediaPosting|BlogPosting|LiveBlogPosting|DiscussionForumPosting|TechArticle|APIReference$/
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+ },
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+
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+ UNLIKELY_ROLES: [ "menu", "menubar", "complementary", "navigation", "alert", "alertdialog", "dialog" ],
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+
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+ DIV_TO_P_ELEMS: new Set([ "BLOCKQUOTE", "DL", "DIV", "IMG", "OL", "P", "PRE", "TABLE", "UL" ]),
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+
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+ ALTER_TO_DIV_EXCEPTIONS: ["DIV", "ARTICLE", "SECTION", "P"],
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+
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+ PRESENTATIONAL_ATTRIBUTES: [ "align", "background", "bgcolor", "border", "cellpadding", "cellspacing", "frame", "hspace", "rules", "style", "valign", "vspace" ],
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+
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+ DEPRECATED_SIZE_ATTRIBUTE_ELEMS: [ "TABLE", "TH", "TD", "HR", "PRE" ],
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+
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+ // The commented out elements qualify as phrasing content but tend to be
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+ // removed by readability when put into paragraphs, so we ignore them here.
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+ PHRASING_ELEMS: [
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+ // "CANVAS", "IFRAME", "SVG", "VIDEO",
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+ "ABBR", "AUDIO", "B", "BDO", "BR", "BUTTON", "CITE", "CODE", "DATA",
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+ "DATALIST", "DFN", "EM", "EMBED", "I", "IMG", "INPUT", "KBD", "LABEL",
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+ "MARK", "MATH", "METER", "NOSCRIPT", "OBJECT", "OUTPUT", "PROGRESS", "Q",
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+ "RUBY", "SAMP", "SCRIPT", "SELECT", "SMALL", "SPAN", "STRONG", "SUB",
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+ "SUP", "TEXTAREA", "TIME", "VAR", "WBR"
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+ ],
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+
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+ // These are the classes that readability sets itself.
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+ CLASSES_TO_PRESERVE: [ "page" ],
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+
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+ // These are the list of HTML entities that need to be escaped.
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+ HTML_ESCAPE_MAP: {
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+ "lt": "<",
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+ "gt": ">",
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+ "amp": "&",
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+ "quot": '"',
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+ "apos": "'",
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+ },
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+
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+ /**
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+ * Run any post-process modifications to article content as necessary.
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+ *
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+ * @param Element
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+ * @return void
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+ **/
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+ _postProcessContent: function(articleContent) {
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+ // Readability cannot open relative uris so we convert them to absolute uris.
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+ this._fixRelativeUris(articleContent);
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+
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+ this._simplifyNestedElements(articleContent);
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+
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+ if (!this._keepClasses) {
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+ // Remove classes.
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+ this._cleanClasses(articleContent);
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+ }
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+ },
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+
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+ /**
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+ * Iterates over a NodeList, calls `filterFn` for each node and removes node
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+ * if function returned `true`.
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+ *
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+ * If function is not passed, removes all the nodes in node list.
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+ *
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+ * @param NodeList nodeList The nodes to operate on
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+ * @param Function filterFn the function to use as a filter
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+ * @return void
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+ */
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+ _removeNodes: function(nodeList, filterFn) {
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+ // Avoid ever operating on live node lists.
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+ if (this._docJSDOMParser && nodeList._isLiveNodeList) {
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+ throw new Error("Do not pass live node lists to _removeNodes");
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+ }
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+ for (var i = nodeList.length - 1; i >= 0; i--) {
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+ var node = nodeList[i];
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+ var parentNode = node.parentNode;
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+ if (parentNode) {
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+ if (!filterFn || filterFn.call(this, node, i, nodeList)) {
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+ parentNode.removeChild(node);
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+ }
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+ }
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+ }
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+ },
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+
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+ /**
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+ * Iterates over a NodeList, and calls _setNodeTag for each node.
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+ *
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+ * @param NodeList nodeList The nodes to operate on
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+ * @param String newTagName the new tag name to use
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+ * @return void
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+ */
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+ _replaceNodeTags: function(nodeList, newTagName) {
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+ // Avoid ever operating on live node lists.
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+ if (this._docJSDOMParser && nodeList._isLiveNodeList) {
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+ throw new Error("Do not pass live node lists to _replaceNodeTags");
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+ }
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+ for (const node of nodeList) {
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+ this._setNodeTag(node, newTagName);
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+ }
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+ },
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+
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+ /**
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+ * Iterate over a NodeList, which doesn't natively fully implement the Array
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+ * interface.
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+ *
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+ * For convenience, the current object context is applied to the provided
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+ * iterate function.
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+ *
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+ * @param NodeList nodeList The NodeList.
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+ * @param Function fn The iterate function.
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+ * @return void
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+ */
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+ _forEachNode: function(nodeList, fn) {
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+ Array.prototype.forEach.call(nodeList, fn, this);
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+ },
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+
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+ /**
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+ * Iterate over a NodeList, and return the first node that passes
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+ * the supplied test function
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+ *
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+ * For convenience, the current object context is applied to the provided
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+ * test function.
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+ *
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+ * @param NodeList nodeList The NodeList.
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+ * @param Function fn The test function.
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+ * @return void
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+ */
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+ _findNode: function(nodeList, fn) {
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+ return Array.prototype.find.call(nodeList, fn, this);
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+ },
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+
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+ /**
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+ * Iterate over a NodeList, return true if any of the provided iterate
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+ * function calls returns true, false otherwise.
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+ *
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+ * For convenience, the current object context is applied to the
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+ * provided iterate function.
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+ *
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+ * @param NodeList nodeList The NodeList.
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+ * @param Function fn The iterate function.
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+ * @return Boolean
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+ */
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+ _someNode: function(nodeList, fn) {
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+ return Array.prototype.some.call(nodeList, fn, this);
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+ },
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+
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+ /**
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+ * Iterate over a NodeList, return true if all of the provided iterate
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+ * function calls return true, false otherwise.
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+ *
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+ * For convenience, the current object context is applied to the
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+ * provided iterate function.
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+ *
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+ * @param NodeList nodeList The NodeList.
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+ * @param Function fn The iterate function.
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+ * @return Boolean
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+ */
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+ _everyNode: function(nodeList, fn) {
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+ return Array.prototype.every.call(nodeList, fn, this);
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+ },
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+
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+ /**
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+ * Concat all nodelists passed as arguments.
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+ *
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+ * @return ...NodeList
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+ * @return Array
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+ */
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+ _concatNodeLists: function() {
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+ var slice = Array.prototype.slice;
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+ var args = slice.call(arguments);
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+ var nodeLists = args.map(function(list) {
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+ return slice.call(list);
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+ });
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+ return Array.prototype.concat.apply([], nodeLists);
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+ },
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+
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+ _getAllNodesWithTag: function(node, tagNames) {
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+ if (node.querySelectorAll) {
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+ return node.querySelectorAll(tagNames.join(","));
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+ }
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+ return [].concat.apply([], tagNames.map(function(tag) {
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+ var collection = node.getElementsByTagName(tag);
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+ return Array.isArray(collection) ? collection : Array.from(collection);
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+ }));
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+ },
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+
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+ /**
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+ * Removes the class="" attribute from every element in the given
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+ * subtree, except those that match CLASSES_TO_PRESERVE and
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+ * the classesToPreserve array from the options object.
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+ *
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+ * @param Element
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+ * @return void
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+ */
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+ _cleanClasses: function(node) {
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+ var classesToPreserve = this._classesToPreserve;
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+ var className = (node.getAttribute("class") || "")
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+ .split(/\s+/)
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+ .filter(function(cls) {
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+ return classesToPreserve.indexOf(cls) != -1;
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+ })
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+ .join(" ");
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+
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+ if (className) {
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+ node.setAttribute("class", className);
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+ } else {
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+ node.removeAttribute("class");
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+ }
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+
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+ for (node = node.firstElementChild; node; node = node.nextElementSibling) {
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+ this._cleanClasses(node);
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+ }
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+ },
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+
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+ /**
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+ * Converts each <a> and <img> uri in the given element to an absolute URI,
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+ * ignoring #ref URIs.
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+ *
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+ * @param Element
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+ * @return void
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+ */
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+ _fixRelativeUris: function(articleContent) {
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+ var baseURI = this._doc.baseURI;
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+ var documentURI = this._doc.documentURI;
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+ function toAbsoluteURI(uri) {
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+ // Leave hash links alone if the base URI matches the document URI:
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+ if (baseURI == documentURI && uri.charAt(0) == "#") {
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+ return uri;
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+ }
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+
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+ // Otherwise, resolve against base URI:
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+ try {
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+ return new URL(uri, baseURI).href;
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+ } catch (ex) {
|
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+ // Something went wrong, just return the original:
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+ }
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+ return uri;
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+ }
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+
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+ var links = this._getAllNodesWithTag(articleContent, ["a"]);
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+ this._forEachNode(links, function(link) {
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|
|
+ 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();
|
Christoph Stelz