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strip out navigational and other superfluous elements #862

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58cde1e
tweaks to strip out navigational elements and other common superfluou…
woutervanwijk Apr 22, 2024
68d3029
fix linter problems
woutervanwijk May 1, 2024
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4 changes: 2 additions & 2 deletions Readability-readerable.js
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Original file line number Diff line number Diff line change
Expand Up @@ -22,8 +22,8 @@
var REGEXPS = {
// NOTE: These two regular expressions are duplicated in
// Readability.js. Please keep both copies in sync.
unlikelyCandidates: /-ad-|ai2html|banner|breadcrumbs|combx|comment|community|cover-wrap|disqus|extra|footer|gdpr|header|legends|menu|related|remark|replies|rss|shoutbox|sidebar|skyscraper|social|sponsor|supplemental|ad-break|agegate|pagination|pager|popup|yom-remote/i,
okMaybeItsACandidate: /and|article|body|column|content|main|shadow/i,
unlikelyCandidates: /-ad-|ai2html|banner|combx|comment|community|cover-wrap|credentials|date|hide|hidden|disqus|extra|footer|gdpr|legends|nav|paywall|meta|menu|related|remark|replies|rss|shoutbox|sidebar|skyscraper|social|sponsor|supplemental|ad-break|agegate|pagination|pager|popup|share|sharing|yom-remote|byline|topbar|article-meta|brand|tooltip/i,
okMaybeItsACandidate: /and|article|body|column|content|main|shadow|header|summary/i,
};

function isNodeVisible(node) {
Expand Down
76 changes: 56 additions & 20 deletions Readability.js
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Original file line number Diff line number Diff line change
Expand Up @@ -112,7 +112,7 @@ Readability.prototype = {
DEFAULT_N_TOP_CANDIDATES: 5,

// Element tags to score by default.
DEFAULT_TAGS_TO_SCORE: "section,h2,h3,h4,h5,h6,p,td,pre".toUpperCase().split(","),
DEFAULT_TAGS_TO_SCORE: "section,h2,h3,h4,h5,h6,p,td,pre,summary,article,header,main".toUpperCase().split(","),

// The default number of chars an article must have in order to return a result
DEFAULT_CHAR_THRESHOLD: 500,
Expand All @@ -122,17 +122,17 @@ Readability.prototype = {
REGEXPS: {
// NOTE: These two regular expressions are duplicated in
// Readability-readerable.js. Please keep both copies in sync.
unlikelyCandidates: /-ad-|ai2html|banner|breadcrumbs|combx|comment|community|cover-wrap|disqus|extra|footer|gdpr|header|legends|menu|related|remark|replies|rss|shoutbox|sidebar|skyscraper|social|sponsor|supplemental|ad-break|agegate|pagination|pager|popup|yom-remote/i,
okMaybeItsACandidate: /and|article|body|column|content|main|shadow/i,
unlikelyCandidates: /-ad-|ai2html|banner|combx|comment|community|cover-wrap|credentials|date|hide|hidden|disqus|extra|footer|gdpr|legends|nav|paywall|meta|menu|related|remark|replies|rss|shoutbox|sidebar|skyscraper|social|sponsor|supplemental|ad-break|agegate|pagination|pager|popup|share|sharing|yom-remote|byline|topbar|article-meta|brand|tooltip/i,
okMaybeItsACandidate: /and|article|body|column|content|main|shadow|header|summary/i,

positive: /article|body|content|entry|hentry|h-entry|main|page|pagination|post|text|blog|story/i,
negative: /-ad-|hidden|^hid$| hid$| hid |^hid |banner|combx|comment|com-|contact|foot|footer|footnote|gdpr|masthead|media|meta|outbrain|promo|related|scroll|share|shoutbox|sidebar|skyscraper|sponsor|shopping|tags|tool|widget/i,
extraneous: /print|archive|comment|discuss|e[\-]?mail|share|reply|all|login|sign|single|utility/i,
byline: /byline|author|dateline|writtenby|p-author/i,
positive: /article|body|content|entry|header|hentry|h-entry|intro|intro|intro|intro|main|main-article|main-content|page|lead|leading|pagination|primary|post|text|blog|story|summary|strapline/i,
negative: /-ad-|affiliate|credentials|controls|date|desktop|hidden|nav|^hid$| hid$| hid |^hid |hide|banner|login|gate|combx|comment|com-|contact|foot|footer|footnote|gdpr|icon|^icon|icons$|icons|masthead|media|meta|paywall|nav|outbrain|promo|related|scroll|share|sharing|shoutbox|sidebar|skyscraper|sponsor|shopping|tags|tool|tooltip|widget|video-player|video|jw-player|jw-aspect|modal|carousel|overlay|byline|brand|disclosure|nav|logo|account|cart|dock/i,
extraneous: /print|affiliate|archive|button|comment|controls|discuss|e[\-]?mail|meta|icons|share|reply|all|login|sign|single|utility|icons|nav|video-player|jw-player|modal|video|paidcontent|carousel|overlay|social|topbar|article-meta|onetrust-consent-sdk|logo|account|cart|hamburger|traffic|weather|search/i,
byline: /byline|author|dateline|credentials|writtenby|p-author|article-author/i,
replaceFonts: /<(\/?)font[^>]*>/gi,
normalize: /\s{2,}/g,
videos: /\/\/(www\.)?((dailymotion|youtube|youtube-nocookie|player\.vimeo|v\.qq)\.com|(archive|upload\.wikimedia)\.org|player\.twitch\.tv)/i,
shareElements: /(\b|_)(share|sharedaddy)(\b|_)/i,
shareElements: /(\b|_)(share|sharedaddy|social|sharebar)(\b|_)/i,
nextLink: /(next|weiter|continue|>([^\|]|$)|»([^\|]|$))/i,
prevLink: /(prev|earl|old|new|<|«)/i,
tokenize: /\W+/g,
Expand All @@ -148,7 +148,10 @@ Readability.prototype = {
jsonLdArticleTypes: /^Article|AdvertiserContentArticle|NewsArticle|AnalysisNewsArticle|AskPublicNewsArticle|BackgroundNewsArticle|OpinionNewsArticle|ReportageNewsArticle|ReviewNewsArticle|Report|SatiricalArticle|ScholarlyArticle|MedicalScholarlyArticle|SocialMediaPosting|BlogPosting|LiveBlogPosting|DiscussionForumPosting|TechArticle|APIReference$/
},

UNLIKELY_ROLES: [ "menu", "menubar", "complementary", "navigation", "alert", "alertdialog", "dialog" ],
UNLIKELY_ROLES: [ "menu", "menubar", "complementary", "navigation", "alert", "alertdialog", "dialog", "nav" ],

NODES_TO_CLEAN_FIRST: ["object", "embed", "footer", "link", "aside", "nav", ".icons", ".byline", ".sub-nav", ".identity", ".logo", ".video-player", ".jw-player", ".jw-wrapper", ".video", ".byline", ".author", ".dateline", ".credentials", ".writtenby", ".p-author", ".article-author", ".navigation", ".hidden-xs", ".hidden-sm", ".brand", ".modalContent", ".noPrint", ".noprint", ".screenonly", ".breadcrumb", ".breadcrumbs", "amp-iframe", "amp-img", "amp-ad", ".advert", ".ads", ".brand", ".search", ".nav", ".user", ".users", "#onetrust-consent-sdk", "#branding", "#branding-content" ],
NODES_TO_CLEAN_SECOND: [ "iframe", "input", "textarea", "select", "button", "svg"],

DIV_TO_P_ELEMS: new Set([ "BLOCKQUOTE", "DL", "DIV", "IMG", "OL", "P", "PRE", "TABLE", "UL" ]),

Expand Down Expand Up @@ -679,11 +682,9 @@ Readability.prototype = {
// 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");
this.NODES_TO_CLEAN_FIRST.forEach((el) => {
this._clean(articleContent, el);
});

// 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".
Expand All @@ -696,11 +697,9 @@ Readability.prototype = {
});
});

this._clean(articleContent, "iframe");
this._clean(articleContent, "input");
this._clean(articleContent, "textarea");
this._clean(articleContent, "select");
this._clean(articleContent, "button");
this.NODES_TO_CLEAN_SECOND.forEach((el) => {
this._clean(articleContent, el);
});
this._cleanHeaders(articleContent);

// Do these last as the previous stuff may have removed junk
Expand All @@ -709,6 +708,13 @@ Readability.prototype = {
this._cleanConditionally(articleContent, "ul");
this._cleanConditionally(articleContent, "div");

//scale down h2-h5 because it's too large most of the time (intro's in h2, etc)
this._replaceNodeTags(this._getAllNodesWithTag(articleContent, ["h5"]), "h6");
this._replaceNodeTags(this._getAllNodesWithTag(articleContent, ["h4"]), "h5");
this._replaceNodeTags(this._getAllNodesWithTag(articleContent, ["h3"]), "h4");
this._replaceNodeTags(this._getAllNodesWithTag(articleContent, ["h2"]), "h3");


// replace H1 with H2 as H1 should be only title that is displayed separately
this._replaceNodeTags(this._getAllNodesWithTag(articleContent, ["h1"]), "h2");

Expand Down Expand Up @@ -756,6 +762,9 @@ Readability.prototype = {

switch (node.tagName) {
case "DIV":
case "MAIN":
case "HEADER":
case "ARTICLE":
node.readability.contentScore += 5;
break;

Expand Down Expand Up @@ -826,6 +835,10 @@ Readability.prototype = {
// 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) {
if (!textA || !textB)
return 0;
if (Math.abs(textA.length - textB.length) > 25)
return 0;
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) {
Expand Down Expand Up @@ -885,6 +898,11 @@ Readability.prototype = {
return null;
}

var fullArticleText = this._doc.body.innerText;
if (fullArticleText.length) {
fullArticleText = fullArticleText.split(/[\r\n]+/).filter((el) => el.length > 50);
}

var pageCacheHtml = page.innerHTML;

while (true) {
Expand Down Expand Up @@ -1013,6 +1031,8 @@ Readability.prototype = {
* A score is determined by things like number of commas, class names, etc. Maybe eventually link density.
**/
var candidates = [];
var elementsCounter = 0;

this._forEachNode(elementsToScore, function(elementToScore) {
if (!elementToScore.parentNode || typeof(elementToScore.parentNode.tagName) === "undefined")
return;
Expand All @@ -1027,6 +1047,8 @@ Readability.prototype = {
if (ancestors.length === 0)
return;

elementsCounter++;

var contentScore = 0;

// Add a point for the paragraph itself as a base.
Expand All @@ -1038,6 +1060,20 @@ Readability.prototype = {
// For every 100 characters in this paragraph, add another point. Up to 3 points.
contentScore += Math.min(Math.floor(innerText.length / 100), 3);

if (innerText.length > 100 && elementsCounter < 10)
fullArticleText.forEach((el) => {
if (el.length > 5 && innerText.indexOf(el) != -1) {
var extra = Math.max(Math.max(0, 10 * (10 - elementsCounter)), 10);
// console.log('add ', extra, innerText);
contentScore += extra;
}
});

// extra score for headers
if (elementToScore.tagName && elementToScore.tagName.length == 2 && elementToScore.tagName.toLowerCase().startsWith("h")) {
contentScore += 100;
}

// Initialize and score ancestors.
this._forEachNode(ancestors, function(ancestor, level) {
if (!ancestor.tagName || !ancestor.parentNode || typeof(ancestor.parentNode.tagName) === "undefined")
Expand Down Expand Up @@ -1546,7 +1582,7 @@ Readability.prototype = {

// get article published time
metadata.publishedTime = jsonld.datePublished ||
values["article:published_time"] || null;
values["article:published_time"] || null;

// in many sites the meta value is escaped with HTML entities,
// so here we need to unescape it
Expand Down