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readability.js
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readability.js
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/*jslint undef: true, nomen: true, eqeqeq: true, plusplus: true, newcap: true, immed: true, browser: true, devel: true, passfail: false */
/*global window: false, readConvertLinksToFootnotes: false, readStyle: false, readSize: false, readMargin: false, Typekit: false, ActiveXObject: false */
var dbg = (typeof console !== 'undefined') ? function(s) {
if (readability.debugging) {
console.log("Readability: " + s);
}
} : function() {};
/*
* Readability. An Arc90 Lab Experiment.
* Website: http://lab.arc90.com/experiments/readability
* Source: http://code.google.com/p/arc90labs-readability
*
* "Readability" is a trademark of Arc90 Inc and may not be used without explicit permission.
*
* Copyright (c) 2010 Arc90 Inc
* Readability is licensed under the Apache License, Version 2.0.
**/
var readability = {
version: '1.7.1',
debugging: false,
emailSrc: 'http://lab.arc90.com/experiments/readability/email.php',
iframeLoads: 0,
convertLinksToFootnotes: false,
reversePageScroll: false, /* If they hold shift and hit space, scroll up */
frameHack: false, /**
* The frame hack is to workaround a firefox bug where if you
* pull content out of a frame and stick it into the parent element, the scrollbar won't appear.
* So we fake a scrollbar in the wrapping div.
**/
biggestFrame: false,
bodyCache: null, /* Cache the body HTML in case we need to re-use it later */
flags: 0x1 | 0x2 | 0x4, /* Start with all flags set. */
/* constants */
FLAG_STRIP_UNLIKELYS: 0x1,
FLAG_WEIGHT_CLASSES: 0x2,
FLAG_CLEAN_CONDITIONALLY: 0x4,
maxPages: 30, /* The maximum number of pages to loop through before we call it quits and just show a link. */
parsedPages: {}, /* The list of pages we've parsed in this call of readability, for autopaging. As a key store for easier searching. */
pageETags: {}, /* A list of the ETag headers of pages we've parsed, in case they happen to match, we'll know it's a duplicate. */
/**
* All of the regular expressions in use within readability.
* Defined up here so we don't instantiate them repeatedly in loops.
**/
regexps: {
unlikelyCandidates: /combx|comment|community|disqus|extra|foot|header|menu|remark|rss|shoutbox|sidebar|sponsor|ad-break|agegate|pagination|pager|popup|tweet|twitter/i,
okMaybeItsACandidate: /and|article|body|column|main|shadow/i,
positive: /article|body|content|entry|hentry|main|page|pagination|post|text|blog|story/i,
negative: /combx|comment|com-|contact|foot|footer|footnote|masthead|media|meta|outbrain|promo|related|scroll|shoutbox|sidebar|sponsor|shopping|tags|tool|widget/i,
extraneous: /print|archive|comment|discuss|e[\-]?mail|share|reply|all|login|sign|single/i,
divToPElements: /<(a|blockquote|dl|div|img|ol|p|pre|table|ul)/i,
replaceBrs: /(<br[^>]*>[ \n\r\t]*){2,}/gi,
replaceFonts: /<(\/?)font[^>]*>/gi,
trim: /^\s+|\s+$/g,
normalize: /\s{2,}/g,
killBreaks: /(<br\s*\/?>(\s| ?)*){1,}/g,
videos: /http:\/\/(www\.)?(youtube|vimeo)\.com/i,
skipFootnoteLink: /^\s*(\[?[a-z0-9]{1,2}\]?|^|edit|citation needed)\s*$/i,
nextLink: /(next|weiter|continue|>([^\|]|$)|»([^\|]|$))/i, // Match: next, continue, >, >>, » but not >|, »| as those usually mean last.
prevLink: /(prev|earl|old|new|<|«)/i
},
/**
* Runs readability.
*
* Workflow:
* 1. Prep the document by removing script tags, css, etc.
* 2. Build readability's DOM tree.
* 3. Grab the article content from the current dom tree.
* 4. Replace the current DOM tree with the new one.
* 5. Read peacefully.
*
* @return void
**/
init: function() {
/* Before we do anything, remove all scripts that are not readability. */
window.onload = window.onunload = function() {};
readability.removeScripts(document);
if(document.body && !readability.bodyCache) {
readability.bodyCache = document.body.innerHTML;
}
/* Make sure this document is added to the list of parsed pages first, so we don't double up on the first page */
readability.parsedPages[window.location.href.replace(/\/$/, '')] = true;
/* Pull out any possible next page link first */
var nextPageLink = readability.findNextPageLink(document.body);
readability.prepDocument();
/* Build readability's DOM tree */
var overlay = document.createElement("DIV");
var innerDiv = document.createElement("DIV");
var articleTools = readability.getArticleTools();
var articleTitle = readability.getArticleTitle();
var articleContent = readability.grabArticle();
var articleFooter = readability.getArticleFooter();
if(false && !articleContent) {
articleContent = document.createElement("DIV");
articleContent.id = "readability-content";
articleContent.innerHTML = [
"<p>Sorry, readability was unable to parse this page for content. If you feel like it should have been able to, please <a href='http://code.google.com/p/arc90labs-readability/issues/entry'>let us know by submitting an issue.</a></p>",
(readability.frameHack ? "<p><strong>It appears this page uses frames.</strong> Unfortunately, browser security properties often cause Readability to fail on pages that include frames. You may want to try running readability itself on this source page: <a href='" + readability.biggestFrame.src + "'>" + readability.biggestFrame.src + "</a></p>" : ""),
"<p>Also, please note that Readability does not play very nicely with front pages. Readability is intended to work on articles with a sizable chunk of text that you'd like to read comfortably. If you're using Readability on a landing page (like nytimes.com for example), please click into an article first before using Readability.</p>"
].join('');
nextPageLink = null;
}
//arrix
if (!articleContent) {
articleContent = readability.getDefaultArticleContent();
}
overlay.id = "readOverlay";
innerDiv.id = "readInner";
/* Apply user-selected styling */
document.body.className = readStyle;
document.dir = readability.getSuggestedDirection(articleTitle.innerHTML);
if (readStyle === "style-athelas" || readStyle === "style-apertura"){
overlay.className = readStyle + " rdbTypekit";
}
else {
overlay.className = readStyle;
}
innerDiv.className = readMargin + " " + readSize;
if(typeof(readConvertLinksToFootnotes) !== 'undefined' && readConvertLinksToFootnotes === true) {
readability.convertLinksToFootnotes = true;
}
/* Glue the structure of our document together. */
innerDiv.appendChild( articleTitle );
innerDiv.appendChild( articleContent );
innerDiv.appendChild( articleFooter );
overlay.appendChild( articleTools );
overlay.appendChild( innerDiv );
/* Clear the old HTML, insert the new content. */
document.body.innerHTML = "";
document.body.insertBefore(overlay, document.body.firstChild);
document.body.removeAttribute('style');
if(readability.frameHack)
{
var readOverlay = document.getElementById('readOverlay');
readOverlay.style.height = '100%';
readOverlay.style.overflow = 'auto';
}
/**
* If someone tries to use Readability on a site's root page, give them a warning about usage.
**/
if((window.location.protocol + "//" + window.location.host + "/") === window.location.href)
{
articleContent.style.display = "none";
var rootWarning = document.createElement('p');
rootWarning.id = "readability-warning";
rootWarning.innerHTML = "<em>Readability</em> was intended for use on individual articles and not home pages. " +
"If you'd like to try rendering this page anyway, <a onClick='javascript:document.getElementById(\"readability-warning\").style.display=\"none\";document.getElementById(\"readability-content\").style.display=\"block\";'>click here</a> to continue.";
innerDiv.insertBefore( rootWarning, articleContent );
}
readability.postProcessContent(articleContent);
window.scrollTo(0, 0);
/* If we're using the Typekit library, select the font */
if (readStyle === "style-athelas" || readStyle === "style-apertura") {
readability.useRdbTypekit();
}
if (nextPageLink) {
/**
* Append any additional pages after a small timeout so that people
* can start reading without having to wait for this to finish processing.
**/
window.setTimeout(function() {
readability.appendNextPage(nextPageLink);
}, 500);
}
/** Smooth scrolling **/
document.onkeydown = function(e) {
var code = (window.event) ? event.keyCode : e.keyCode;
if (code === 16) {
readability.reversePageScroll = true;
return;
}
if (code === 32) {
readability.curScrollStep = 0;
var windowHeight = window.innerHeight ? window.innerHeight : (document.documentElement.clientHeight ? document.documentElement.clientHeight : document.body.clientHeight);
if(readability.reversePageScroll) {
readability.scrollTo(readability.scrollTop(), readability.scrollTop() - (windowHeight - 50), 20, 10);
}
else {
readability.scrollTo(readability.scrollTop(), readability.scrollTop() + (windowHeight - 50), 20, 10);
}
return false;
}
};
document.onkeyup = function(e) {
var code = (window.event) ? event.keyCode : e.keyCode;
if (code === 16) {
readability.reversePageScroll = false;
return;
}
};
},
/**
* Run any post-process modifications to article content as necessary.
*
* @param Element
* @return void
**/
postProcessContent: function(articleContent) {
if(readability.convertLinksToFootnotes && !window.location.href.match(/wikipedia\.org/g)) {
readability.addFootnotes(articleContent);
}
readability.fixImageFloats(articleContent);
},
/**
* Some content ends up looking ugly if the image is too large to be floated.
* If the image is wider than a threshold (currently 55%), no longer float it,
* center it instead.
*
* @param Element
* @return void
**/
fixImageFloats: function (articleContent) {
var imageWidthThreshold = Math.min(articleContent.offsetWidth, 800) * 0.55,
images = articleContent.getElementsByTagName('img');
for(var i=0, il = images.length; i < il; i+=1) {
var image = images[i];
if(image.offsetWidth > imageWidthThreshold) {
image.className += " blockImage";
}
}
},
/**
* Get the article tools Element that has buttons like reload, print, email.
*
* @return void
**/
getArticleTools: function () {
var articleTools = document.createElement("DIV");
articleTools.id = "readTools";
articleTools.innerHTML =
"<a href='#' onclick='return window.location.reload()' title='Reload original page' id='reload-page'>Reload Original Page</a>" +
"<a href='#' onclick='javascript:window.print();' title='Print page' id='print-page'>Print Page</a>" +
"<a href='#' onclick='readability.emailBox(); return false;' title='Email page' id='email-page'>Email Page</a>";
return articleTools;
},
/**
* retuns the suggested direction of the string
*
* @return "rtl" || "ltr"
**/
getSuggestedDirection: function(text) {
function sanitizeText() {
return text.replace(/@\w+/, "");
}
function countMatches(match) {
var matches = text.match(new RegExp(match, "g"));
return matches !== null ? matches.length : 0;
}
function isRTL() {
var count_heb = countMatches("[\\u05B0-\\u05F4\\uFB1D-\\uFBF4]");
var count_arb = countMatches("[\\u060C-\\u06FE\\uFB50-\\uFEFC]");
// if 20% of chars are Hebrew or Arbic then direction is rtl
return (count_heb + count_arb) * 100 / text.length > 20;
}
text = sanitizeText(text);
return isRTL() ? "rtl" : "ltr";
},
/**
* Get the article title as an H1.
*
* @return void
**/
getArticleTitle: function () {
var curTitle = "",
origTitle = "";
try {
curTitle = origTitle = document.title;
if(typeof curTitle !== "string") { /* If they had an element with id "title" in their HTML */
curTitle = origTitle = readability.getInnerText(document.getElementsByTagName('title')[0]);
}
}
catch(e) {}
if(curTitle.match(/ [\|\-] /))
{
curTitle = origTitle.replace(/(.*)[\|\-] .*/gi,'$1');
if(curTitle.split(' ').length < 3) {
curTitle = origTitle.replace(/[^\|\-]*[\|\-](.*)/gi,'$1');
}
}
else if(curTitle.indexOf(': ') !== -1)
{
curTitle = origTitle.replace(/.*:(.*)/gi, '$1');
if(curTitle.split(' ').length < 3) {
curTitle = origTitle.replace(/[^:]*[:](.*)/gi,'$1');
}
}
else if(curTitle.length > 150 || curTitle.length < 15)
{
var hOnes = document.getElementsByTagName('h1');
if(hOnes.length === 1)
{
curTitle = readability.getInnerText(hOnes[0]);
}
}
curTitle = curTitle.replace( readability.regexps.trim, "" );
if(curTitle.split(' ').length <= 4) {
curTitle = origTitle;
}
var articleTitle = document.createElement("H1");
articleTitle.innerHTML = curTitle;
return articleTitle;
},
/**
* Get the footer with the readability mark etc.
*
* @return void
**/
getArticleFooter: function () {
var articleFooter = document.createElement("DIV");
/**
* For research purposes, generate an img src that contains the chosen readstyle etc,
* so we can generate aggregate stats and change styles based on them in the future
**/
// var statsQueryParams = "?readStyle=" + encodeURIComponent(readStyle) + "&readMargin=" + encodeURIComponent(readMargin) + "&readSize=" + encodeURIComponent(readSize);
/* TODO: attach this to an image */
articleFooter.id = "readFooter";
articleFooter.innerHTML = [
"<div id='rdb-footer-print'>Excerpted from <cite>" + document.title + "</cite><br />" + window.location.href + "</div>",
"<div id='rdb-footer-wrapper'>",
"<div id='rdb-footer-left'>",
"<a href='http://lab.arc90.com/experiments/readability' id='readability-logo'>Readability — </a>",
"<a href='http://www.arc90.com/' id='arc90-logo'> An Arc90 Laboratory Experiment </a>",
" <span id='readability-url'> http://lab.arc90.com/experiments/readability</span>",
"</div>",
"<div id='rdb-footer-right'>",
"<a href='http://www.twitter.com/arc90' class='footer-twitterLink'>Follow us on Twitter »</a>",
"<span class='version'>Readability version " + readability.version + "</span>",
"</div>",
"</div>"].join('');
return articleFooter;
},
/**
* Prepare the HTML document for readability to scrape it.
* This includes things like stripping javascript, CSS, and handling terrible markup.
*
* @return void
**/
prepDocument: function () {
/**
* In some cases a body element can't be found (if the HTML is totally hosed for example)
* so we create a new body node and append it to the document.
*/
if(document.body === null)
{
var body = document.createElement("body");
try {
document.body = body;
}
catch(e) {
document.documentElement.appendChild(body);
dbg(e);
}
}
document.body.id = "readabilityBody";
var frames = document.getElementsByTagName('frame');
if(frames.length > 0)
{
var bestFrame = null;
var bestFrameSize = 0; /* The frame to try to run readability upon. Must be on same domain. */
var biggestFrameSize = 0; /* Used for the error message. Can be on any domain. */
for(var frameIndex = 0; frameIndex < frames.length; frameIndex+=1)
{
var frameSize = frames[frameIndex].offsetWidth + frames[frameIndex].offsetHeight;
var canAccessFrame = false;
try {
var frameBody = frames[frameIndex].contentWindow.document.body;
canAccessFrame = true;
}
catch(eFrames) {
dbg(eFrames);
}
if(frameSize > biggestFrameSize) {
biggestFrameSize = frameSize;
readability.biggestFrame = frames[frameIndex];
}
if(canAccessFrame && frameSize > bestFrameSize)
{
readability.frameHack = true;
bestFrame = frames[frameIndex];
bestFrameSize = frameSize;
}
}
if(bestFrame)
{
var newBody = document.createElement('body');
newBody.innerHTML = bestFrame.contentWindow.document.body.innerHTML;
newBody.style.overflow = 'scroll';
document.body = newBody;
var frameset = document.getElementsByTagName('frameset')[0];
if(frameset) {
frameset.parentNode.removeChild(frameset); }
}
}
timed(function() {
// arrix: this is very slow and I don't need it
if (false) {
/* Remove all stylesheets */
for (var k=0;k < document.styleSheets.length; k+=1) {
if (document.styleSheets[k].href !== null && document.styleSheets[k].href.lastIndexOf("readability") === -1) {
document.styleSheets[k].disabled = true;
}
}
/* Remove all style tags in head (not doing this on IE) - TODO: Why not? */
var styleTags = document.getElementsByTagName("style");
for (var st=0;st < styleTags.length; st+=1) {
styleTags[st].textContent = "";
}
}
}, 'Remove all stylesheets');
/* Turn all double br's into p's */
/* Note, this is pretty costly as far as processing goes. Maybe optimize later. */
timed(function() {
//arrix: we can do this before constructing the DOM which is much faster
return;
document.body.innerHTML = document.body.innerHTML.replace(readability.regexps.replaceBrs, '</p><p>').replace(readability.regexps.replaceFonts, '<$1span>');
}, 'Turn all double br\'s into p\'s');
},
/**
* For easier reading, convert this document to have footnotes at the bottom rather than inline links.
* @see http://www.roughtype.com/archives/2010/05/experiments_in.php
*
* @return void
**/
addFootnotes: function(articleContent) {
var footnotesWrapper = document.getElementById('readability-footnotes'),
articleFootnotes = document.getElementById('readability-footnotes-list');
if(!footnotesWrapper) {
footnotesWrapper = document.createElement("DIV");
footnotesWrapper.id = 'readability-footnotes';
footnotesWrapper.innerHTML = '<h3>References</h3>';
footnotesWrapper.style.display = 'none'; /* Until we know we have footnotes, don't show the references block. */
articleFootnotes = document.createElement('ol');
articleFootnotes.id = 'readability-footnotes-list';
footnotesWrapper.appendChild(articleFootnotes);
var readFooter = document.getElementById('readFooter');
if(readFooter) {
readFooter.parentNode.insertBefore(footnotesWrapper, readFooter);
}
}
var articleLinks = articleContent.getElementsByTagName('a');
var linkCount = articleFootnotes.getElementsByTagName('li').length;
for (var i = 0; i < articleLinks.length; i+=1)
{
var articleLink = articleLinks[i],
footnoteLink = articleLink.cloneNode(true),
refLink = document.createElement('a'),
footnote = document.createElement('li'),
linkDomain = footnoteLink.host ? footnoteLink.host : document.location.host,
linkText = readability.getInnerText(articleLink);
if(articleLink.className && articleLink.className.indexOf('readability-DoNotFootnote') !== -1 || linkText.match(readability.regexps.skipFootnoteLink)) {
continue;
}
linkCount+=1;
/** Add a superscript reference after the article link */
refLink.href = '#readabilityFootnoteLink-' + linkCount;
refLink.innerHTML = '<small><sup>[' + linkCount + ']</sup></small>';
refLink.className = 'readability-DoNotFootnote';
try { refLink.style.color = 'inherit'; } catch(e) {} /* IE7 doesn't like inherit. */
if(articleLink.parentNode.lastChild === articleLink) {
articleLink.parentNode.appendChild(refLink);
} else {
articleLink.parentNode.insertBefore(refLink, articleLink.nextSibling);
}
articleLink.name = 'readabilityLink-' + linkCount;
try { articleLink.style.color = 'inherit'; } catch(err) {} /* IE7 doesn't like inherit. */
footnote.innerHTML = "<small><sup><a href='#readabilityLink-" + linkCount + "' title='Jump to Link in Article'>^</a></sup></small> ";
footnoteLink.innerHTML = (footnoteLink.title ? footnoteLink.title : linkText);
footnoteLink.name = 'readabilityFootnoteLink-' + linkCount;
footnote.appendChild(footnoteLink);
footnote.innerHTML = footnote.innerHTML + "<small> (" + linkDomain + ")</small>";
articleFootnotes.appendChild(footnote);
}
if(linkCount > 0) {
footnotesWrapper.style.display = 'block';
}
},
useRdbTypekit: function () {
var rdbHead = document.getElementsByTagName('head')[0];
var rdbTKScript = document.createElement('script');
var rdbTKCode = null;
var rdbTKLink = document.createElement('a');
rdbTKLink.setAttribute('class','rdbTK-powered');
rdbTKLink.setAttribute('title','Fonts by Typekit');
rdbTKLink.innerHTML = "Fonts by <span class='rdbTK'>Typekit</span>";
if (readStyle === "style-athelas") {
rdbTKCode = "sxt6vzy";
dbg("Using Athelas Theme");
rdbTKLink.setAttribute('href','http://typekit.com/?utm_source=readability&utm_medium=affiliate&utm_campaign=athelas');
rdbTKLink.setAttribute('id','rdb-athelas');
document.getElementById("rdb-footer-right").appendChild(rdbTKLink);
}
if (readStyle === "style-apertura") {
rdbTKCode = "bae8ybu";
dbg("Using Inverse Theme");
rdbTKLink.setAttribute('href','http://typekit.com/?utm_source=readability&utm_medium=affiliate&utm_campaign=inverse');
rdbTKLink.setAttribute('id','rdb-inverse');
document.getElementById("rdb-footer-right").appendChild(rdbTKLink);
}
/**
* Setting new script tag attributes to pull Typekits libraries
**/
rdbTKScript.setAttribute('type','text/javascript');
rdbTKScript.setAttribute('src',"http://use.typekit.com/" + rdbTKCode + ".js");
rdbTKScript.setAttribute('charset','UTF-8');
rdbHead.appendChild(rdbTKScript);
/**
* In the future, maybe try using the following experimental Callback function?:
* http://gist.github.com/192350
* &
* http://getsatisfaction.com/typekit/topics/support_a_pre_and_post_load_callback_function
**/
var typekitLoader = function() {
dbg("Looking for Typekit.");
if(typeof Typekit !== "undefined") {
try {
dbg("Caught typekit");
Typekit.load();
clearInterval(window.typekitInterval);
} catch(e) {
dbg("Typekit error: " + e);
}
}
};
window.typekitInterval = window.setInterval(typekitLoader, 100);
},
/**
* 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) {
readability.cleanStyles(articleContent);
readability.killBreaks(articleContent);
/* Clean out junk from the article content */
readability.cleanConditionally(articleContent, "form");
readability.clean(articleContent, "object");
readability.clean(articleContent, "h1");
/**
* If there is only one h2, they are probably using it
* as a header and not a subheader, so remove it since we already have a header.
***/
if(articleContent.getElementsByTagName('h2').length === 1) {
readability.clean(articleContent, "h2");
}
readability.clean(articleContent, "iframe");
readability.cleanHeaders(articleContent);
/* Do these last as the previous stuff may have removed junk that will affect these */
readability.cleanConditionally(articleContent, "table");
readability.cleanConditionally(articleContent, "ul");
readability.cleanConditionally(articleContent, "div");
timed(function() {
/* Remove extra paragraphs */
//arrix
function WalkChildrenElements(node, func) {
function walk(cur) {
var children = cur.children, i, len, e;
for (i = 0, len = children.length; i < len; i++) {
e = children[i];
if (e.nodeType == 1) {
func(e);
walk(e);
}
}
}
walk(node);
}
var articleParagraphs = articleContent.getElementsByTagName('p');
for(var i = articleParagraphs.length-1; i >= 0; i-=1) {
var imgCount = 0; //articleParagraphs[i].getElementsByTagName('img').length;
var embedCount = 0; // articleParagraphs[i].getElementsByTagName('embed').length;
var objectCount = 0; // articleParagraphs[i].getElementsByTagName('object').length;
//arrix
WalkChildrenElements(articleParagraphs[i], function(cur) {
switch (cur.tagName) {
case 'IMG':
imgCount++;
break;
case 'EMBED':
embedCount++;
break;
case 'OBJECT':
objectCount++;
break;
}
});
if(imgCount === 0 && embedCount === 0 && objectCount === 0 && readability.getInnerText(articleParagraphs[i], false) === '') {
articleParagraphs[i].parentNode.removeChild(articleParagraphs[i]);
}
}
}, "prepArticle Remove extra paragraphs");
timed(function() {
try {
articleContent.innerHTML = articleContent.innerHTML.replace(/<br[^>]*>\s*<p/gi, '<p');
}
catch (e) {
dbg("Cleaning innerHTML of breaks failed. This is an IE strict-block-elements bug. Ignoring.: " + e);
}
}, "prepArticle innerHTML replacement");
},
/**
* 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 += readability.getClassWeight(node);
},
/***
* 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) {
var stripUnlikelyCandidates = readability.flagIsActive(readability.FLAG_STRIP_UNLIKELYS),
isPaging = (page !== null) ? true: false;
page = page ? page : document.body;
var pageCacheHtml = page.innerHTML;
/**
* 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.)
*
* Note: Assignment from index for performance. See http://www.peachpit.com/articles/article.aspx?p=31567&seqNum=5
* TODO: Shouldn't this be a reverse traversal?
**/
var nodesToScore = [];
function nodePrepping(node) {
/* Remove unlikely candidates */
if (stripUnlikelyCandidates) {
var unlikelyMatchString = node.className + node.id;
if (
(
unlikelyMatchString.search(readability.regexps.unlikelyCandidates) !== -1 &&
unlikelyMatchString.search(readability.regexps.okMaybeItsACandidate) === -1 &&
node.tagName !== "BODY"
)
)
{
dbg("Removing unlikely candidate - " + unlikelyMatchString);
node.parentNode.removeChild(node);
return null;
}
}
if (node.tagName === "P" || node.tagName === "TD" || node.tagName === "PRE") {
nodesToScore[nodesToScore.length] = node;
}
/* Turn all divs that don't have children block level elements into p's */
if (node.tagName === "DIV") {
if (node.innerHTML.search(readability.regexps.divToPElements) === -1) {
var newNode = document.createElement('p');
try {
newNode.innerHTML = node.innerHTML;
node.parentNode.replaceChild(newNode, node);
nodesToScore[nodesToScore.length] = node;
newNode.oneMoreTime = true;
return newNode;
}
catch(e) {
dbg("Could not alter div to p, probably an IE restriction, reverting back to div.: " + e);
}
}
else
{
/* EXPERIMENTAL */
for(var i = 0, il = node.childNodes.length; i < il; i+=1) {
var childNode = node.childNodes[i];
if(childNode.nodeType === 3) { // Node.TEXT_NODE
var p = document.createElement('p');
p.innerHTML = childNode.nodeValue;
p.style.display = 'inline';
p.className = 'readability-styled';
childNode.parentNode.replaceChild(p, childNode);
}
}
}
}
return node;
}
timed(function() {
LiveTagWalker(page, '*', nodePrepping);
}, 'grabArticle nodePrepping');
/**
* 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 = [];
timed(function() {
for (var pt=0; pt < nodesToScore.length; pt+=1) {
var parentNode = nodesToScore[pt].parentNode;
var grandParentNode = parentNode ? parentNode.parentNode : null;
var innerText = readability.getInnerText(nodesToScore[pt]);
if(!parentNode || typeof(parentNode.tagName) === 'undefined') {
continue;
}
/* If this paragraph is less than 25 characters, don't even count it. */
if(innerText.length < 25) {
continue; }
/* Initialize readability data for the parent. */
if(typeof parentNode.readability === 'undefined') {
readability.initializeNode(parentNode);
candidates.push(parentNode);
}
/* Initialize readability data for the grandparent. */
if(grandParentNode && typeof(grandParentNode.readability) === 'undefined' && typeof(grandParentNode.tagName) !== 'undefined') {
readability.initializeNode(grandParentNode);
candidates.push(grandParentNode);
}
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(readability.reComma).length; //arrix
/* For every 100 characters in this paragraph, add another point. Up to 3 points. */
contentScore += Math.min(Math.floor(innerText.length / 100), 3);
/* Add the score to the parent. The grandparent gets half. */
parentNode.readability.contentScore += contentScore;
if(grandParentNode) {
grandParentNode.readability.contentScore += contentScore/2;
}
}
}, 'grabArticle calculate scores');
/**
* After we've calculated scores, loop through all of the possible candidate nodes we found
* and find the one with the highest score.
**/
var topCandidate = null;
timed(function() {
for(var c=0, cl=candidates.length; c < cl; c+=1)
{
/**
* 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.
**/
candidates[c].readability.contentScore = candidates[c].readability.contentScore * (1-readability.getLinkDensity(candidates[c]));
dbg('Candidate: ' + candidates[c] + " (" + candidates[c].className + ":" + candidates[c].id + ") with score " + candidates[c].readability.contentScore);
if(!topCandidate || candidates[c].readability.contentScore > topCandidate.readability.contentScore) {
topCandidate = candidates[c]; }
}
/**
* 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")
{
topCandidate = document.createElement("DIV");
topCandidate.innerHTML = page.innerHTML;
page.innerHTML = "";
page.appendChild(topCandidate);
readability.initializeNode(topCandidate);
}
}, 'grabArticle find top candidate');
/**
* 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 = document.createElement("DIV");
timed(function(){
if (isPaging) {
articleContent.id = "readability-content";
}
var siblingScoreThreshold = Math.max(10, topCandidate.readability.contentScore * 0.2);
var siblingNodes = topCandidate.parentNode.childNodes;
for(var s=0, sl=siblingNodes.length; s < sl; s+=1) {
var siblingNode = siblingNodes[s];
var append = false;
/**
* Fix for odd IE7 Crash where siblingNode does not exist even though this should be a live nodeList.
* Example of error visible here: http://www.esquire.com/features/honesty0707
**/
if(!siblingNode) {
continue;
}
dbg("Looking at sibling node: " + siblingNode + " (" + siblingNode.className + ":" + siblingNode.id + ")" + ((typeof siblingNode.readability !== 'undefined') ? (" with score " + siblingNode.readability.contentScore) : ''));
dbg("Sibling has score " + (siblingNode.readability ? siblingNode.readability.contentScore : 'Unknown'));
if(siblingNode === topCandidate)
{
append = true;
}
var contentBonus = 0;
/* Give a bonus if sibling nodes and top candidates have the example same classname */
if(siblingNode.className === topCandidate.className && topCandidate.className !== "") {
contentBonus += topCandidate.readability.contentScore * 0.2;
}
if(typeof siblingNode.readability !== 'undefined' && (siblingNode.readability.contentScore+contentBonus) >= siblingScoreThreshold)
{
append = true;
}
if(siblingNode.nodeName === "P") {
var linkDensity = readability.getLinkDensity(siblingNode);
var nodeContent = readability.getInnerText(siblingNode);
var nodeLength = nodeContent.length;
if(nodeLength > 80 && linkDensity < 0.25)
{
append = true;
}
else if(nodeLength < 80 && linkDensity === 0 && nodeContent.search(/\.( |$)/) !== -1)
{
append = true;
}
}
if(append) {
dbg("Appending node: " + siblingNode);
var nodeToAppend = null;
if(siblingNode.nodeName !== "DIV" && siblingNode.nodeName !== "P") {
/* 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. */
dbg("Altering siblingNode of " + siblingNode.nodeName + ' to div.');
nodeToAppend = document.createElement("DIV");
try {
nodeToAppend.id = siblingNode.id;
nodeToAppend.innerHTML = siblingNode.innerHTML;