#640: update Readability to tip
This commit is contained in:
Cameron Kaiser
parent
5261bd155f
commit
8c52b1a328
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@ -37,14 +37,22 @@ function isNodeVisible(node) {
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/**
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* Decides whether or not the document is reader-able without parsing the whole thing.
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*
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* @return boolean Whether or not we suspect Readability.parse() will suceeed at returning an article object.
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* @param {Object} options Configuration object.
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* @param {number} [options.minContentLength=140] The minimum node content length used to decide if the document is readerable.
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* @param {number} [options.minScore=20] The minumum cumulated 'score' used to determine if the document is readerable.
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* @param {Function} [options.visibilityChecker=isNodeVisible] The function used to determine if a node is visible.
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* @return {boolean} Whether or not we suspect Readability.parse() will suceeed at returning an article object.
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*/
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function isProbablyReaderable(doc, isVisible) {
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if (!isVisible) {
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isVisible = isNodeVisible;
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function isProbablyReaderable(doc, options = {}) {
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// For backward compatibility reasons 'options' can either be a configuration object or the function used
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// to determine if a node is visible.
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if (typeof options == "function") {
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options = { visibilityChecker: options };
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}
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var defaultOptions = { minScore: 20, minContentLength: 140, visibilityChecker: isNodeVisible };
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options = Object.assign(defaultOptions, options);
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var nodes = doc.querySelectorAll("p, pre");
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// Get <div> nodes which have <br> node(s) and append them into the `nodes` variable.
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@ -57,7 +65,7 @@ function isProbablyReaderable(doc, isVisible) {
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var brNodes = doc.querySelectorAll("div > br");
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if (brNodes.length) {
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var set = new Set(nodes);
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[].forEach.call(brNodes, function(node) {
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[].forEach.call(brNodes, function (node) {
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set.add(node.parentNode);
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});
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nodes = Array.from(set);
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@ -66,9 +74,10 @@ function isProbablyReaderable(doc, isVisible) {
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var score = 0;
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// This is a little cheeky, we use the accumulator 'score' to decide what to return from
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// this callback:
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return [].some.call(nodes, function(node) {
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if (!isVisible(node))
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return [].some.call(nodes, function (node) {
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if (!options.visibilityChecker(node)) {
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return false;
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}
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var matchString = node.className + " " + node.id;
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if (REGEXPS.unlikelyCandidates.test(matchString) &&
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@ -81,13 +90,13 @@ function isProbablyReaderable(doc, isVisible) {
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}
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var textContentLength = node.textContent.trim().length;
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if (textContentLength < 140) {
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if (textContentLength < options.minContentLength) {
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return false;
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}
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score += Math.sqrt(textContentLength - 140);
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score += Math.sqrt(textContentLength - options.minContentLength);
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if (score > 20) {
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if (score > options.minScore) {
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return true;
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}
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return false;
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@ -60,31 +60,32 @@ function Readability(doc, options) {
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this.FLAG_WEIGHT_CLASSES |
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this.FLAG_CLEAN_CONDITIONALLY;
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var logEl;
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// Control whether log messages are sent to the console
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if (this._debug) {
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logEl = function(e) {
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var rv = e.nodeName + " ";
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if (e.nodeType == e.TEXT_NODE) {
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return rv + '("' + e.textContent + '")';
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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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var classDesc = e.className && ("." + e.className.replace(/ /g, "."));
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var elDesc = "";
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if (e.id)
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elDesc = "(#" + e.id + classDesc + ")";
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else if (classDesc)
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elDesc = "(" + classDesc + ")";
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return rv + elDesc;
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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) ? logEl(x) : 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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var args = ["Reader: (Readability) "].concat(arguments);
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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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@ -124,7 +125,7 @@ Readability.prototype = {
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okMaybeItsACandidate: /and|article|body|column|content|main|shadow/i,
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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: /hidden|^hid$| hid$| hid |^hid |banner|combx|comment|com-|contact|foot|footer|footnote|gdpr|masthead|media|meta|outbrain|promo|related|scroll|share|shoutbox|sidebar|skyscraper|sponsor|shopping|tags|tool|widget/i,
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negative: /-ad-|hidden|^hid$| hid$| hid |^hid |banner|combx|comment|com-|contact|foot|footer|footnote|gdpr|masthead|media|meta|outbrain|promo|related|scroll|share|shoutbox|sidebar|skyscraper|sponsor|shopping|tags|tool|widget/i,
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extraneous: /print|archive|comment|discuss|e[\-]?mail|share|reply|all|login|sign|single|utility/i,
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byline: /byline|author|dateline|writtenby|p-author/i,
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replaceFonts: /<(\/?)font[^>]*>/gi,
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@ -133,8 +134,10 @@ Readability.prototype = {
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shareElements: /(\b|_)(share|sharedaddy)(\b|_)/i,
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nextLink: /(next|weiter|continue|>([^\|]|$)|»([^\|]|$))/i,
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prevLink: /(prev|earl|old|new|<|«)/i,
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tokenize: /\W+/g,
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whitespace: /^\s*$/,
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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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@ -143,7 +146,7 @@ Readability.prototype = {
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UNLIKELY_ROLES: [ "menu", "menubar", "complementary", "navigation", "alert", "alertdialog", "dialog" ],
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DIV_TO_P_ELEMS: [ "A", "BLOCKQUOTE", "DL", "DIV", "IMG", "OL", "P", "PRE", "TABLE", "UL", "SELECT" ],
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DIV_TO_P_ELEMS: new Set([ "BLOCKQUOTE", "DL", "DIV", "IMG", "OL", "P", "PRE", "TABLE", "UL" ]),
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ALTER_TO_DIV_EXCEPTIONS: ["DIV", "ARTICLE", "SECTION", "P"],
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@ -230,8 +233,7 @@ Readability.prototype = {
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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 (var i = nodeList.length - 1; i >= 0; i--) {
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var node = nodeList[i];
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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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@ -452,7 +454,7 @@ Readability.prototype = {
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/**
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* Get the article title as an H1.
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*
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* @return void
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* @return string
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**/
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_getArticleTitle: function() {
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var doc = this._doc;
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@ -548,11 +550,11 @@ Readability.prototype = {
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},
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/**
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* Finds the next element, starting from the given node, and ignoring
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* Finds the next node, starting from the given node, and ignoring
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* whitespace in between. If the given node is an element, the same node is
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* returned.
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*/
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_nextElement: function (node) {
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_nextNode: function (node) {
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var next = node;
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while (next
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&& (next.nodeType != this.ELEMENT_NODE)
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@ -577,10 +579,10 @@ Readability.prototype = {
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// <p> block.
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var replaced = false;
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// If we find a <br> chain, remove the <br>s until we hit another element
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// If we find a <br> chain, remove the <br>s until we hit another node
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// or non-whitespace. This leaves behind the first <br> in the chain
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// (which will be replaced with a <p> later).
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while ((next = this._nextElement(next)) && (next.tagName == "BR")) {
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while ((next = this._nextNode(next)) && (next.tagName == "BR")) {
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replaced = true;
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var brSibling = next.nextSibling;
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next.parentNode.removeChild(next);
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@ -598,7 +600,7 @@ Readability.prototype = {
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while (next) {
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// If we've hit another <br><br>, we're done adding children to this <p>.
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if (next.tagName == "BR") {
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var nextElem = this._nextElement(next.nextSibling);
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var nextElem = this._nextNode(next.nextSibling);
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if (nextElem && nextElem.tagName == "BR")
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break;
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}
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@ -675,7 +677,6 @@ Readability.prototype = {
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this._cleanConditionally(articleContent, "fieldset");
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this._clean(articleContent, "object");
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this._clean(articleContent, "embed");
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this._clean(articleContent, "h1");
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this._clean(articleContent, "footer");
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this._clean(articleContent, "link");
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this._clean(articleContent, "aside");
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@ -691,25 +692,6 @@ Readability.prototype = {
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});
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});
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// If there is only one h2 and its text content substantially equals article title,
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// they are probably using it as a header and not a subheader,
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// so remove it since we already extract the title separately.
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var h2 = articleContent.getElementsByTagName("h2");
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if (h2.length === 1) {
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var lengthSimilarRate = (h2[0].textContent.length - this._articleTitle.length) / this._articleTitle.length;
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if (Math.abs(lengthSimilarRate) < 0.5) {
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var titlesMatch = false;
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if (lengthSimilarRate > 0) {
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titlesMatch = h2[0].textContent.includes(this._articleTitle);
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} else {
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titlesMatch = this._articleTitle.includes(h2[0].textContent);
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}
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if (titlesMatch) {
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this._clean(articleContent, "h2");
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}
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}
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}
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this._clean(articleContent, "iframe");
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this._clean(articleContent, "input");
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this._clean(articleContent, "textarea");
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@ -723,6 +705,9 @@ Readability.prototype = {
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this._cleanConditionally(articleContent, "ul");
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this._cleanConditionally(articleContent, "div");
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// replace H1 with H2 as H1 should be only title that is displayed separately
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this._replaceNodeTags(this._getAllNodesWithTag(articleContent, ["h1"]), "h2");
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// Remove extra paragraphs
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this._removeNodes(this._getAllNodesWithTag(articleContent, ["p"]), function (paragraph) {
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var imgCount = paragraph.getElementsByTagName("img").length;
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@ -736,7 +721,7 @@ Readability.prototype = {
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});
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this._forEachNode(this._getAllNodesWithTag(articleContent, ["br"]), function(br) {
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var next = this._nextElement(br.nextSibling);
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var next = this._nextNode(br.nextSibling);
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if (next && next.tagName == "P")
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br.parentNode.removeChild(br);
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});
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@ -832,6 +817,21 @@ Readability.prototype = {
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return node && node.nextElementSibling;
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},
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// compares second text to first one
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// 1 = same text, 0 = completely different text
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// works the way that it splits both texts into words and then finds words that are unique in second text
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// the result is given by the lower length of unique parts
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_textSimilarity: function(textA, textB) {
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var tokensA = textA.toLowerCase().split(this.REGEXPS.tokenize).filter(Boolean);
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var tokensB = textB.toLowerCase().split(this.REGEXPS.tokenize).filter(Boolean);
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if (!tokensA.length || !tokensB.length) {
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return 0;
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}
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var uniqTokensB = tokensB.filter(token => !tokensA.includes(token));
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var distanceB = uniqTokensB.join(" ").length / tokensB.join(" ").length;
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return 1 - distanceB;
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},
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_checkByline: function(node, matchString) {
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if (this._articleByline) {
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return false;
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@ -872,7 +872,7 @@ Readability.prototype = {
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_grabArticle: function (page) {
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this.log("**** grabArticle ****");
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var doc = this._doc;
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var isPaging = (page !== null ? true: false);
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var isPaging = page !== null;
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page = page ? page : this._doc.body;
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// We can't grab an article if we don't have a page!
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@ -884,6 +884,7 @@ Readability.prototype = {
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var pageCacheHtml = page.innerHTML;
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while (true) {
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this.log("Starting grabArticle loop");
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var stripUnlikelyCandidates = this._flagIsActive(this.FLAG_STRIP_UNLIKELYS);
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// First, node prepping. Trash nodes that look cruddy (like ones with the
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@ -892,6 +893,8 @@ Readability.prototype = {
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var elementsToScore = [];
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var node = this._doc.documentElement;
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let shouldRemoveTitleHeader = true;
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while (node) {
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var matchString = node.className + " " + node.id;
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@ -907,11 +910,19 @@ Readability.prototype = {
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continue;
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}
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if (shouldRemoveTitleHeader && this._headerDuplicatesTitle(node)) {
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this.log("Removing header: ", node.textContent.trim(), this._articleTitle.trim());
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shouldRemoveTitleHeader = false;
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node = this._removeAndGetNext(node);
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continue;
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}
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// Remove unlikely candidates
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if (stripUnlikelyCandidates) {
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if (this.REGEXPS.unlikelyCandidates.test(matchString) &&
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!this.REGEXPS.okMaybeItsACandidate.test(matchString) &&
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!this._hasAncestorTag(node, "table") &&
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!this._hasAncestorTag(node, "code") &&
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node.tagName !== "BODY" &&
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node.tagName !== "A") {
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this.log("Removing unlikely candidate - " + matchString);
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@ -1235,9 +1246,8 @@ Readability.prototype = {
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var div = doc.createElement("DIV");
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div.id = "readability-page-1";
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div.className = "page";
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var children = articleContent.childNodes;
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while (children.length) {
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div.appendChild(children[0]);
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while (articleContent.firstChild) {
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div.appendChild(articleContent.firstChild);
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}
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articleContent.appendChild(div);
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}
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@ -1446,13 +1456,11 @@ Readability.prototype = {
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if (elementProperty) {
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matches = elementProperty.match(propertyPattern);
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if (matches) {
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for (var i = matches.length - 1; i >= 0; i--) {
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// Convert to lowercase, and remove any whitespace
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// so we can match below.
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name = matches[i].toLowerCase().replace(/\s/g, "");
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// multiple authors
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values[name] = content.trim();
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}
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// Convert to lowercase, and remove any whitespace
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// so we can match below.
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name = matches[0].toLowerCase().replace(/\s/g, "");
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// multiple authors
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values[name] = content.trim();
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}
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}
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if (!matches && elementName && namePattern.test(elementName)) {
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@ -1654,7 +1662,7 @@ Readability.prototype = {
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*/
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_hasChildBlockElement: function (element) {
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return this._someNode(element.childNodes, function(node) {
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return this.DIV_TO_P_ELEMS.indexOf(node.tagName) !== -1 ||
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return this.DIV_TO_P_ELEMS.has(node.tagName) ||
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this._hasChildBlockElement(node);
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});
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},
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@ -1748,7 +1756,9 @@ Readability.prototype = {
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// XXX implement _reduceNodeList?
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this._forEachNode(element.getElementsByTagName("a"), function(linkNode) {
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linkLength += this._getInnerText(linkNode).length;
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var href = linkNode.getAttribute("href");
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var coefficient = href && this.REGEXPS.hashUrl.test(href) ? 0.3 : 1;
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linkLength += this._getInnerText(linkNode).length * coefficient;
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});
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return linkLength / textLength;
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@ -1875,7 +1885,7 @@ Readability.prototype = {
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/**
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* Look for 'data' (as opposed to 'layout') tables, for which we use
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* similar checks as
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* https://dxr.mozilla.org/mozilla-central/rev/71224049c0b52ab190564d3ea0eab089a159a4cf/accessible/html/HTMLTableAccessible.cpp#920
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* https://searchfox.org/mozilla-central/rev/f82d5c549f046cb64ce5602bfd894b7ae807c8f8/accessible/generic/TableAccessible.cpp#19
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*/
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_markDataTables: function(root) {
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var tables = root.getElementsByTagName("table");
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@ -2000,6 +2010,17 @@ Readability.prototype = {
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});
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},
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_getTextDensity: function(e, tags) {
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var textLength = this._getInnerText(e, true).length;
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if (textLength === 0) {
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return 0;
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}
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var childrenLength = 0;
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var children = this._getAllNodesWithTag(e, tags);
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this._forEachNode(children, (child) => childrenLength += this._getInnerText(child, true).length);
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return childrenLength / textLength;
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},
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/**
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* Clean an element of all tags of type "tag" if they look fishy.
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* "Fishy" is an algorithm based on content length, classnames, link density, number of images & embeds, etc.
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@ -2010,8 +2031,6 @@ Readability.prototype = {
|
|||
if (!this._flagIsActive(this.FLAG_CLEAN_CONDITIONALLY))
|
||||
return;
|
||||
|
||||
var isList = tag === "ul" || tag === "ol";
|
||||
|
||||
// Gather counts for other typical elements embedded within.
|
||||
// Traverse backwards so we can remove nodes at the same time
|
||||
// without effecting the traversal.
|
||||
|
|
@ -2023,6 +2042,14 @@ Readability.prototype = {
|
|||
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;
|
||||
}
|
||||
|
|
@ -2032,11 +2059,16 @@ Readability.prototype = {
|
|||
return false;
|
||||
}
|
||||
|
||||
if (this._hasAncestorTag(node, "code")) {
|
||||
return false;
|
||||
}
|
||||
|
||||
var weight = this._getClassWeight(node);
|
||||
var contentScore = 0;
|
||||
|
||||
this.log("Cleaning Conditionally", node);
|
||||
|
||||
var contentScore = 0;
|
||||
|
||||
if (weight + contentScore < 0) {
|
||||
return true;
|
||||
}
|
||||
|
|
@ -2049,6 +2081,7 @@ Readability.prototype = {
|
|||
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"]);
|
||||
|
|
@ -2076,7 +2109,7 @@ Readability.prototype = {
|
|||
(img > 1 && p / img < 0.5 && !this._hasAncestorTag(node, "figure")) ||
|
||||
(!isList && li > p) ||
|
||||
(input > Math.floor(p/3)) ||
|
||||
(!isList && contentLength < 25 && (img === 0 || img > 2) && !this._hasAncestorTag(node, "figure")) ||
|
||||
(!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);
|
||||
|
|
@ -2106,17 +2139,38 @@ Readability.prototype = {
|
|||
},
|
||||
|
||||
/**
|
||||
* Clean out spurious headers from an Element. Checks things like classnames and link density.
|
||||
* Clean out spurious headers from an Element.
|
||||
*
|
||||
* @param Element
|
||||
* @return void
|
||||
**/
|
||||
_cleanHeaders: function(e) {
|
||||
this._removeNodes(this._getAllNodesWithTag(e, ["h1", "h2"]), function (header) {
|
||||
return this._getClassWeight(header) < 0;
|
||||
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;
|
||||
},
|
||||
|
|
|
|||
Loading…
Reference in New Issue