+++ /dev/null
-<?php
-/**
-* Arc90's Readability ported to PHP for FiveFilters.org
-* Based on readability.js version 1.7.1 (without multi-page support)
-* Updated to allow HTML5 parsing with html5lib
-* Updated with lightClean mode to preserve more images and youtube/vimeo/viddler embeds
-* ------------------------------------------------------
-* Original URL: http://lab.arc90.com/experiments/readability/js/readability.js
-* Arc90's project URL: http://lab.arc90.com/experiments/readability/
-* JS Source: http://code.google.com/p/arc90labs-readability
-* Ported by: Keyvan Minoukadeh, http://www.keyvan.net
-* More information: http://fivefilters.org/content-only/
-* License: Apache License, Version 2.0
-* Requires: PHP5
-* Date: 2012-09-19
-*
-* Differences between the PHP port and the original
-* ------------------------------------------------------
-* Arc90's Readability is designed to run in the browser. It works on the DOM
-* tree (the parsed HTML) after the page's CSS styles have been applied and
-* Javascript code executed. This PHP port does not run inside a browser.
-* We use PHP's ability to parse HTML to build our DOM tree, but we cannot
-* rely on CSS or Javascript support. As such, the results will not always
-* match Arc90's Readability. (For example, if a web page contains CSS style
-* rules or Javascript code which hide certain HTML elements from display,
-* Arc90's Readability will dismiss those from consideration but our PHP port,
-* unable to understand CSS or Javascript, will not know any better.)
-*
-* Another significant difference is that the aim of Arc90's Readability is
-* to re-present the main content block of a given web page so users can
-* read it more easily in their browsers. Correct identification, clean up,
-* and separation of the content block is only a part of this process.
-* This PHP port is only concerned with this part, it does not include code
-* that relates to presentation in the browser - Arc90 already do
-* that extremely well, and for PDF output there's FiveFilters.org's
-* PDF Newspaper: http://fivefilters.org/pdf-newspaper/.
-*
-* Finally, this class contains methods that might be useful for developers
-* working on HTML document fragments. So without deviating too much from
-* the original code (which I don't want to do because it makes debugging
-* and updating more difficult), I've tried to make it a little more
-* developer friendly. You should be able to use the methods here on
-* existing DOMElement objects without passing an entire HTML document to
-* be parsed.
-*/
-
-// This class allows us to do JavaScript like assignements to innerHTML
-require_once(dirname(__FILE__).'/JSLikeHTMLElement.php');
-libxml_use_internal_errors(true);
-
-// Alternative usage (for testing only!)
-// uncomment the lines below and call Readability.php in your browser
-// passing it the URL of the page you'd like content from, e.g.:
-// Readability.php?url=http://medialens.org/alerts/09/090615_the_guardian_climate.php
-
-/*
-if (!isset($_GET['url']) || $_GET['url'] == '') {
- die('Please pass a URL to the script. E.g. Readability.php?url=bla.com/story.html');
-}
-$url = $_GET['url'];
-if (!preg_match('!^https?://!i', $url)) $url = 'http://'.$url;
-$html = file_get_contents($url);
-$r = new Readability($html, $url);
-$r->init();
-echo $r->articleContent->innerHTML;
-*/
-
-class Readability
-{
- public $version = '1.7.1-without-multi-page';
- public $convertLinksToFootnotes = false;
- public $revertForcedParagraphElements = true;
- public $articleTitle;
- public $articleContent;
- public $dom;
- public $url = null; // optional - URL where HTML was retrieved
- public $debug = false;
- public $lightClean = true; // preserves more content (experimental) added 2012-09-19
- protected $body = null; //
- protected $bodyCache = null; // Cache the body HTML in case we need to re-use it later
- protected $flags = 7; // 1 | 2 | 4; // Start with all flags set.
- protected $success = false; // indicates whether we were able to extract or not
-
- /**
- * All of the regular expressions in use within readability.
- * Defined up here so we don't instantiate them repeatedly in loops.
- **/
- public $regexps = array(
- 'unlikelyCandidates' => '/combx|comment|community|disqus|extra|foot|header|menu|remark|rss|shoutbox|sidebar|sponsor|ad-break|agegate|pagination|pager|popup/i',
- 'okMaybeItsACandidate' => '/and|article|body|column|main|shadow/i',
- 'positive' => '/article|body|content|entry|hentry|main|page|attachment|pagination|post|text|blog|story/i',
- 'negative' => '/combx|comment|com-|contact|foot|footer|_nav|footnote|masthead|media|meta|outbrain|promo|related|scroll|shoutbox|sidebar|sponsor|shopping|tags|tool|widget/i',
- 'divToPElements' => '/<(a|blockquote|dl|div|img|ol|p|pre|table|ul)/i',
- 'replaceBrs' => '/(<br[^>]*>[ \n\r\t]*){2,}/i',
- 'replaceFonts' => '/<(\/?)font[^>]*>/i',
- // 'trimRe' => '/^\s+|\s+$/g', // PHP has trim()
- 'normalize' => '/\s{2,}/',
- 'killBreaks' => '/(<br\s*\/?>(\s| ?)*){1,}/',
- 'video' => '!//(player\.|www\.)?(youtube|vimeo|viddler)\.com!i',
- 'skipFootnoteLink' => '/^\s*(\[?[a-z0-9]{1,2}\]?|^|edit|citation needed)\s*$/i'
- );
-
- /* constants */
- const FLAG_STRIP_UNLIKELYS = 1;
- const FLAG_WEIGHT_CLASSES = 2;
- const FLAG_CLEAN_CONDITIONALLY = 4;
-
- /**
- * Create instance of Readability
- * @param string UTF-8 encoded string
- * @param string (optional) URL associated with HTML (used for footnotes)
- * @param string which parser to use for turning raw HTML into a DOMDocument (either 'libxml' or 'html5lib')
- */
- function __construct($html, $url=null, $parser='libxml')
- {
- $this->url = $url;
- /* Turn all double br's into p's */
- $html = preg_replace($this->regexps['replaceBrs'], '</p><p>', $html);
- $html = preg_replace($this->regexps['replaceFonts'], '<$1span>', $html);
- $html = mb_convert_encoding($html, 'HTML-ENTITIES', "UTF-8");
- if (trim($html) == '') $html = '<html></html>';
- if ($parser=='html5lib' && ($this->dom = HTML5_Parser::parse($html))) {
- // all good
- } else {
- $this->dom = new DOMDocument();
- $this->dom->preserveWhiteSpace = false;
- @$this->dom->loadHTML($html);
- }
- $this->dom->registerNodeClass('DOMElement', 'JSLikeHTMLElement');
- }
-
- /**
- * Get article title element
- * @return DOMElement
- */
- public function getTitle() {
- return $this->articleTitle;
- }
-
- /**
- * Get article content element
- * @return DOMElement
- */
- public function getContent() {
- return $this->articleContent;
- }
-
- /**
- * Runs readability.
- *
- * Workflow:
- * 1. Prep the document by removing script tags, css, etc.
- * 2. Build readability's DOM tree.
- * 3. Grab the article content from the current dom tree.
- * 4. Replace the current DOM tree with the new one.
- * 5. Read peacefully.
- *
- * @return boolean true if we found content, false otherwise
- **/
- public function init()
- {
- if (!isset($this->dom->documentElement)) return false;
- $this->removeScripts($this->dom);
- //die($this->getInnerHTML($this->dom->documentElement));
-
- // Assume successful outcome
- $this->success = true;
-
- $bodyElems = $this->dom->getElementsByTagName('body');
- if ($bodyElems->length > 0) {
- if ($this->bodyCache == null) {
- $this->bodyCache = $bodyElems->item(0)->innerHTML;
- }
- if ($this->body == null) {
- $this->body = $bodyElems->item(0);
- }
- }
-
- $this->prepDocument();
-
- //die($this->dom->documentElement->parentNode->nodeType);
- //$this->setInnerHTML($this->dom->documentElement, $this->getInnerHTML($this->dom->documentElement));
- //die($this->getInnerHTML($this->dom->documentElement));
-
- /* Build readability's DOM tree */
- $overlay = $this->dom->createElement('div');
- $innerDiv = $this->dom->createElement('div');
- $articleTitle = $this->getArticleTitle();
- $articleContent = $this->grabArticle();
-
- if (!$articleContent) {
- $this->success = false;
- $articleContent = $this->dom->createElement('div');
- $articleContent->setAttribute('id', 'readability-content');
- $articleContent->innerHTML = '<p>Sorry, Readability was unable to parse this page for content.</p>';
- }
-
- $overlay->setAttribute('id', 'readOverlay');
- $innerDiv->setAttribute('id', 'readInner');
-
- /* Glue the structure of our document together. */
- $innerDiv->appendChild($articleTitle);
- $innerDiv->appendChild($articleContent);
- $overlay->appendChild($innerDiv);
-
- /* Clear the old HTML, insert the new content. */
- $this->body->innerHTML = '';
- $this->body->appendChild($overlay);
- //document.body.insertBefore(overlay, document.body.firstChild);
- $this->body->removeAttribute('style');
-
- $this->postProcessContent($articleContent);
-
- // Set title and content instance variables
- $this->articleTitle = $articleTitle;
- $this->articleContent = $articleContent;
-
- return $this->success;
- }
-
- /**
- * Debug
- */
- protected function dbg($msg) {
- if ($this->debug) echo '* ',$msg, "\n";
- }
-
- /**
- * Run any post-process modifications to article content as necessary.
- *
- * @param DOMElement
- * @return void
- */
- public function postProcessContent($articleContent) {
- if ($this->convertLinksToFootnotes && !preg_match('/wikipedia\.org/', @$this->url)) {
- $this->addFootnotes($articleContent);
- }
- }
-
- /**
- * Get the article title as an H1.
- *
- * @return DOMElement
- */
- protected function getArticleTitle() {
- $curTitle = '';
- $origTitle = '';
-
- try {
- $curTitle = $origTitle = $this->getInnerText($this->dom->getElementsByTagName('title')->item(0));
- } catch(Exception $e) {}
-
- if (preg_match('/ [\|\-] /', $curTitle))
- {
- $curTitle = preg_replace('/(.*)[\|\-] .*/i', '$1', $origTitle);
-
- if (count(explode(' ', $curTitle)) < 3) {
- $curTitle = preg_replace('/[^\|\-]*[\|\-](.*)/i', '$1', $origTitle);
- }
- }
- else if (strpos($curTitle, ': ') !== false)
- {
- $curTitle = preg_replace('/.*:(.*)/i', '$1', $origTitle);
-
- if (count(explode(' ', $curTitle)) < 3) {
- $curTitle = preg_replace('/[^:]*[:](.*)/i','$1', $origTitle);
- }
- }
- else if(strlen($curTitle) > 150 || strlen($curTitle) < 15)
- {
- $hOnes = $this->dom->getElementsByTagName('h1');
- if($hOnes->length == 1)
- {
- $curTitle = $this->getInnerText($hOnes->item(0));
- }
- }
-
- $curTitle = trim($curTitle);
-
- if (count(explode(' ', $curTitle)) <= 4) {
- $curTitle = $origTitle;
- }
-
- $articleTitle = $this->dom->createElement('h1');
- $articleTitle->innerHTML = $curTitle;
-
- return $articleTitle;
- }
-
- /**
- * Prepare the HTML document for readability to scrape it.
- * This includes things like stripping javascript, CSS, and handling terrible markup.
- *
- * @return void
- **/
- protected function prepDocument() {
- /**
- * In some cases a body element can't be found (if the HTML is totally hosed for example)
- * so we create a new body node and append it to the document.
- */
- if ($this->body == null)
- {
- $this->body = $this->dom->createElement('body');
- $this->dom->documentElement->appendChild($this->body);
- }
- $this->body->setAttribute('id', 'readabilityBody');
-
- /* Remove all style tags in head */
- $styleTags = $this->dom->getElementsByTagName('style');
- for ($i = $styleTags->length-1; $i >= 0; $i--)
- {
- $styleTags->item($i)->parentNode->removeChild($styleTags->item($i));
- }
-
- /* Turn all double br's into p's */
- /* Note, this is pretty costly as far as processing goes. Maybe optimize later. */
- //document.body.innerHTML = document.body.innerHTML.replace(readability.regexps.replaceBrs, '</p><p>').replace(readability.regexps.replaceFonts, '<$1span>');
- // We do this in the constructor for PHP as that's when we have raw HTML - before parsing it into a DOM tree.
- // Manipulating innerHTML as it's done in JS is not possible in PHP.
- }
-
- /**
- * For easier reading, convert this document to have footnotes at the bottom rather than inline links.
- * @see http://www.roughtype.com/archives/2010/05/experiments_in.php
- *
- * @return void
- **/
- public function addFootnotes($articleContent) {
- $footnotesWrapper = $this->dom->createElement('div');
- $footnotesWrapper->setAttribute('id', 'readability-footnotes');
- $footnotesWrapper->innerHTML = '<h3>References</h3>';
-
- $articleFootnotes = $this->dom->createElement('ol');
- $articleFootnotes->setAttribute('id', 'readability-footnotes-list');
- $footnotesWrapper->appendChild($articleFootnotes);
-
- $articleLinks = $articleContent->getElementsByTagName('a');
-
- $linkCount = 0;
- for ($i = 0; $i < $articleLinks->length; $i++)
- {
- $articleLink = $articleLinks->item($i);
- $footnoteLink = $articleLink->cloneNode(true);
- $refLink = $this->dom->createElement('a');
- $footnote = $this->dom->createElement('li');
- $linkDomain = @parse_url($footnoteLink->getAttribute('href'), PHP_URL_HOST);
- if (!$linkDomain && isset($this->url)) $linkDomain = @parse_url($this->url, PHP_URL_HOST);
- //linkDomain = footnoteLink.host ? footnoteLink.host : document.location.host,
- $linkText = $this->getInnerText($articleLink);
-
- if ((strpos($articleLink->getAttribute('class'), 'readability-DoNotFootnote') !== false) || preg_match($this->regexps['skipFootnoteLink'], $linkText)) {
- continue;
- }
-
- $linkCount++;
-
- /** Add a superscript reference after the article link */
- $refLink->setAttribute('href', '#readabilityFootnoteLink-' . $linkCount);
- $refLink->innerHTML = '<small><sup>[' . $linkCount . ']</sup></small>';
- $refLink->setAttribute('class', 'readability-DoNotFootnote');
- $refLink->setAttribute('style', 'color: inherit;');
-
- //TODO: does this work or should we use DOMNode.isSameNode()?
- if ($articleLink->parentNode->lastChild == $articleLink) {
- $articleLink->parentNode->appendChild($refLink);
- } else {
- $articleLink->parentNode->insertBefore($refLink, $articleLink->nextSibling);
- }
-
- $articleLink->setAttribute('style', 'color: inherit; text-decoration: none;');
- $articleLink->setAttribute('name', 'readabilityLink-' . $linkCount);
-
- $footnote->innerHTML = '<small><sup><a href="#readabilityLink-' . $linkCount . '" title="Jump to Link in Article">^</a></sup></small> ';
-
- $footnoteLink->innerHTML = ($footnoteLink->getAttribute('title') != '' ? $footnoteLink->getAttribute('title') : $linkText);
- $footnoteLink->setAttribute('name', 'readabilityFootnoteLink-' . $linkCount);
-
- $footnote->appendChild($footnoteLink);
- if ($linkDomain) $footnote->innerHTML = $footnote->innerHTML . '<small> (' . $linkDomain . ')</small>';
-
- $articleFootnotes->appendChild($footnote);
- }
-
- if ($linkCount > 0) {
- $articleContent->appendChild($footnotesWrapper);
- }
- }
-
- /**
- * Reverts P elements with class 'readability-styled'
- * to text nodes - which is what they were before.
- *
- * @param DOMElement
- * @return void
- */
- function revertReadabilityStyledElements($articleContent) {
- $xpath = new DOMXPath($articleContent->ownerDocument);
- $elems = $xpath->query('.//p[@class="readability-styled"]', $articleContent);
- //$elems = $articleContent->getElementsByTagName('p');
- for ($i = $elems->length-1; $i >= 0; $i--) {
- $e = $elems->item($i);
- $e->parentNode->replaceChild($articleContent->ownerDocument->createTextNode($e->textContent), $e);
- //if ($e->hasAttribute('class') && $e->getAttribute('class') == 'readability-styled') {
- // $e->parentNode->replaceChild($this->dom->createTextNode($e->textContent), $e);
- //}
- }
- }
-
- /**
- * Prepare the article node for display. Clean out any inline styles,
- * iframes, forms, strip extraneous <p> tags, etc.
- *
- * @param DOMElement
- * @return void
- */
- function prepArticle($articleContent) {
- $this->cleanStyles($articleContent);
- $this->killBreaks($articleContent);
- if ($this->revertForcedParagraphElements) {
- $this->revertReadabilityStyledElements($articleContent);
- }
-
- /* Clean out junk from the article content */
- $this->cleanConditionally($articleContent, 'form');
- $this->clean($articleContent, 'object');
- $this->clean($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 (!$this->lightClean && ($articleContent->getElementsByTagName('h2')->length == 1)) {
- $this->clean($articleContent, 'h2');
- }
- $this->clean($articleContent, 'iframe');
-
- $this->cleanHeaders($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');
-
- /* Remove extra paragraphs */
- $articleParagraphs = $articleContent->getElementsByTagName('p');
- for ($i = $articleParagraphs->length-1; $i >= 0; $i--)
- {
- $imgCount = $articleParagraphs->item($i)->getElementsByTagName('img')->length;
- $embedCount = $articleParagraphs->item($i)->getElementsByTagName('embed')->length;
- $objectCount = $articleParagraphs->item($i)->getElementsByTagName('object')->length;
- $iframeCount = $articleParagraphs->item($i)->getElementsByTagName('iframe')->length;
-
- if ($imgCount === 0 && $embedCount === 0 && $objectCount === 0 && $iframeCount === 0 && $this->getInnerText($articleParagraphs->item($i), false) == '')
- {
- $articleParagraphs->item($i)->parentNode->removeChild($articleParagraphs->item($i));
- }
- }
-
- try {
- $articleContent->innerHTML = preg_replace('/<br[^>]*>\s*<p/i', '<p', $articleContent->innerHTML);
- //articleContent.innerHTML = articleContent.innerHTML.replace(/<br[^>]*>\s*<p/gi, '<p');
- }
- catch (Exception $e) {
- $this->dbg("Cleaning innerHTML of breaks failed. This is an IE strict-block-elements bug. Ignoring.: " . $e);
- }
- }
-
- /**
- * Initialize a node with the readability object. Also checks the
- * className/id for special names to add to its score.
- *
- * @param Element
- * @return void
- **/
- protected function initializeNode($node) {
- $readability = $this->dom->createAttribute('readability');
- $readability->value = 0; // this is our contentScore
- $node->setAttributeNode($readability);
-
- switch (strtoupper($node->tagName)) { // unsure if strtoupper is needed, but using it just in case
- case 'DIV':
- $readability->value += 5;
- break;
-
- case 'PRE':
- case 'TD':
- case 'BLOCKQUOTE':
- $readability->value += 3;
- break;
-
- case 'ADDRESS':
- case 'OL':
- case 'UL':
- case 'DL':
- case 'DD':
- case 'DT':
- case 'LI':
- case 'FORM':
- $readability->value -= 3;
- break;
-
- case 'H1':
- case 'H2':
- case 'H3':
- case 'H4':
- case 'H5':
- case 'H6':
- case 'TH':
- $readability->value -= 5;
- break;
- }
- $readability->value += $this->getClassWeight($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.
- *
- * @return DOMElement
- **/
- protected function grabArticle($page=null) {
- $stripUnlikelyCandidates = $this->flagIsActive(self::FLAG_STRIP_UNLIKELYS);
- if (!$page) $page = $this->dom;
- $allElements = $page->getElementsByTagName('*');
- /**
- * 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?
- **/
- $node = null;
- $nodesToScore = array();
- for ($nodeIndex = 0; ($node = $allElements->item($nodeIndex)); $nodeIndex++) {
- //for ($nodeIndex=$targetList->length-1; $nodeIndex >= 0; $nodeIndex--) {
- //$node = $targetList->item($nodeIndex);
- $tagName = strtoupper($node->tagName);
- /* Remove unlikely candidates */
- if ($stripUnlikelyCandidates) {
- $unlikelyMatchString = $node->getAttribute('class') . $node->getAttribute('id');
- if (
- preg_match($this->regexps['unlikelyCandidates'], $unlikelyMatchString) &&
- !preg_match($this->regexps['okMaybeItsACandidate'], $unlikelyMatchString) &&
- $tagName != 'BODY'
- )
- {
- $this->dbg('Removing unlikely candidate - ' . $unlikelyMatchString);
- //$nodesToRemove[] = $node;
- $node->parentNode->removeChild($node);
- $nodeIndex--;
- continue;
- }
- }
-
- if ($tagName == 'P' || $tagName == 'TD' || $tagName == 'PRE') {
- $nodesToScore[] = $node;
- }
-
- /* Turn all divs that don't have children block level elements into p's */
- if ($tagName == 'DIV') {
- if (!preg_match($this->regexps['divToPElements'], $node->innerHTML)) {
- //$this->dbg('Altering div to p');
- $newNode = $this->dom->createElement('p');
- try {
- $newNode->innerHTML = $node->innerHTML;
- //$nodesToReplace[] = array('new'=>$newNode, 'old'=>$node);
- $node->parentNode->replaceChild($newNode, $node);
- $nodeIndex--;
- $nodesToScore[] = $node; // or $newNode?
- }
- catch(Exception $e) {
- $this->dbg('Could not alter div to p, reverting back to div.: ' . $e);
- }
- }
- else
- {
- /* EXPERIMENTAL */
- // TODO: change these p elements back to text nodes after processing
- for ($i = 0, $il = $node->childNodes->length; $i < $il; $i++) {
- $childNode = $node->childNodes->item($i);
- if ($childNode->nodeType == 3) { // XML_TEXT_NODE
- //$this->dbg('replacing text node with a p tag with the same content.');
- $p = $this->dom->createElement('p');
- $p->innerHTML = $childNode->nodeValue;
- $p->setAttribute('style', 'display: inline;');
- $p->setAttribute('class', 'readability-styled');
- $childNode->parentNode->replaceChild($p, $childNode);
- }
- }
- }
- }
- }
-
- /**
- * 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.
- **/
- $candidates = array();
- for ($pt=0; $pt < count($nodesToScore); $pt++) {
- $parentNode = $nodesToScore[$pt]->parentNode;
- // $grandParentNode = $parentNode ? $parentNode->parentNode : null;
- $grandParentNode = !$parentNode ? null : (($parentNode->parentNode instanceof DOMElement) ? $parentNode->parentNode : null);
- $innerText = $this->getInnerText($nodesToScore[$pt]);
-
- if (!$parentNode || !isset($parentNode->tagName)) {
- continue;
- }
-
- /* If this paragraph is less than 25 characters, don't even count it. */
- if(strlen($innerText) < 25) {
- continue;
- }
-
- /* Initialize readability data for the parent. */
- if (!$parentNode->hasAttribute('readability'))
- {
- $this->initializeNode($parentNode);
- $candidates[] = $parentNode;
- }
-
- /* Initialize readability data for the grandparent. */
- if ($grandParentNode && !$grandParentNode->hasAttribute('readability') && isset($grandParentNode->tagName))
- {
- $this->initializeNode($grandParentNode);
- $candidates[] = $grandParentNode;
- }
-
- $contentScore = 0;
-
- /* Add a point for the paragraph itself as a base. */
- $contentScore++;
-
- /* Add points for any commas within this paragraph */
- $contentScore += count(explode(',', $innerText));
-
- /* For every 100 characters in this paragraph, add another point. Up to 3 points. */
- $contentScore += min(floor(strlen($innerText) / 100), 3);
-
- /* Add the score to the parent. The grandparent gets half. */
- $parentNode->getAttributeNode('readability')->value += $contentScore;
-
- if ($grandParentNode) {
- $grandParentNode->getAttributeNode('readability')->value += $contentScore/2;
- }
- }
-
- /**
- * After we've calculated scores, loop through all of the possible candidate nodes we found
- * and find the one with the highest score.
- **/
- $topCandidate = null;
- for ($c=0, $cl=count($candidates); $c < $cl; $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.
- **/
- $readability = $candidates[$c]->getAttributeNode('readability');
- $readability->value = $readability->value * (1-$this->getLinkDensity($candidates[$c]));
-
- $this->dbg('Candidate: ' . $candidates[$c]->tagName . ' (' . $candidates[$c]->getAttribute('class') . ':' . $candidates[$c]->getAttribute('id') . ') with score ' . $readability->value);
-
- if (!$topCandidate || $readability->value > (int)$topCandidate->getAttribute('readability')) {
- $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 ($topCandidate === null || strtoupper($topCandidate->tagName) == 'BODY')
- {
- $topCandidate = $this->dom->createElement('div');
- if ($page instanceof DOMDocument) {
- if (!isset($page->documentElement)) {
- // we don't have a body either? what a mess! :)
- } else {
- $topCandidate->innerHTML = $page->documentElement->innerHTML;
- $page->documentElement->innerHTML = '';
- $this->reinitBody();
- $page->documentElement->appendChild($topCandidate);
- }
- } else {
- $topCandidate->innerHTML = $page->innerHTML;
- $page->innerHTML = '';
- $page->appendChild($topCandidate);
- }
- $this->initializeNode($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.
- **/
- $articleContent = $this->dom->createElement('div');
- $articleContent->setAttribute('id', 'readability-content');
- $siblingScoreThreshold = max(10, ((int)$topCandidate->getAttribute('readability')) * 0.2);
- $siblingNodes = @$topCandidate->parentNode->childNodes;
- if (!isset($siblingNodes)) {
- $siblingNodes = new stdClass;
- $siblingNodes->length = 0;
- }
-
- for ($s=0, $sl=$siblingNodes->length; $s < $sl; $s++)
- {
- $siblingNode = $siblingNodes->item($s);
- $append = false;
-
- $this->dbg('Looking at sibling node: ' . $siblingNode->nodeName . (($siblingNode->nodeType === XML_ELEMENT_NODE && $siblingNode->hasAttribute('readability')) ? (' with score ' . $siblingNode->getAttribute('readability')) : ''));
-
- //dbg('Sibling has score ' . ($siblingNode->readability ? siblingNode.readability.contentScore : 'Unknown'));
-
- if ($siblingNode === $topCandidate)
- // or if ($siblingNode->isSameNode($topCandidate))
- {
- $append = true;
- }
-
- $contentBonus = 0;
- /* Give a bonus if sibling nodes and top candidates have the example same classname */
- if ($siblingNode->nodeType === XML_ELEMENT_NODE && $siblingNode->getAttribute('class') == $topCandidate->getAttribute('class') && $topCandidate->getAttribute('class') != '') {
- $contentBonus += ((int)$topCandidate->getAttribute('readability')) * 0.2;
- }
-
- if ($siblingNode->nodeType === XML_ELEMENT_NODE && $siblingNode->hasAttribute('readability') && (((int)$siblingNode->getAttribute('readability')) + $contentBonus) >= $siblingScoreThreshold)
- {
- $append = true;
- }
-
- if (strtoupper($siblingNode->nodeName) == 'P') {
- $linkDensity = $this->getLinkDensity($siblingNode);
- $nodeContent = $this->getInnerText($siblingNode);
- $nodeLength = strlen($nodeContent);
-
- if ($nodeLength > 80 && $linkDensity < 0.25)
- {
- $append = true;
- }
- else if ($nodeLength < 80 && $linkDensity === 0 && preg_match('/\.( |$)/', $nodeContent))
- {
- $append = true;
- }
- }
-
- if ($append)
- {
- $this->dbg('Appending node: ' . $siblingNode->nodeName);
-
- $nodeToAppend = null;
- $sibNodeName = strtoupper($siblingNode->nodeName);
- if ($sibNodeName != 'DIV' && $sibNodeName != '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. */
-
- $this->dbg('Altering siblingNode of ' . $sibNodeName . ' to div.');
- $nodeToAppend = $this->dom->createElement('div');
- try {
- $nodeToAppend->setAttribute('id', $siblingNode->getAttribute('id'));
- $nodeToAppend->innerHTML = $siblingNode->innerHTML;
- }
- catch(Exception $e)
- {
- $this->dbg('Could not alter siblingNode to div, reverting back to original.');
- $nodeToAppend = $siblingNode;
- $s--;
- $sl--;
- }
- } else {
- $nodeToAppend = $siblingNode;
- $s--;
- $sl--;
- }
-
- /* To ensure a node does not interfere with readability styles, remove its classnames */
- $nodeToAppend->removeAttribute('class');
-
- /* Append sibling and subtract from our list because it removes the node when you append to another node */
- $articleContent->appendChild($nodeToAppend);
- }
- }
-
- /**
- * So we have all of the content that we need. Now we clean it up for presentation.
- **/
- $this->prepArticle($articleContent);
-
- /**
- * 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.
- **/
- if (strlen($this->getInnerText($articleContent, false)) < 250)
- {
- // TODO: find out why element disappears sometimes, e.g. for this URL http://www.businessinsider.com/6-hedge-fund-etfs-for-average-investors-2011-7
- // in the meantime, we check and create an empty element if it's not there.
- $this->reinitBody();
-
- if ($this->flagIsActive(self::FLAG_STRIP_UNLIKELYS)) {
- $this->removeFlag(self::FLAG_STRIP_UNLIKELYS);
- return $this->grabArticle($this->body);
- }
- else if ($this->flagIsActive(self::FLAG_WEIGHT_CLASSES)) {
- $this->removeFlag(self::FLAG_WEIGHT_CLASSES);
- return $this->grabArticle($this->body);
- }
- else if ($this->flagIsActive(self::FLAG_CLEAN_CONDITIONALLY)) {
- $this->removeFlag(self::FLAG_CLEAN_CONDITIONALLY);
- return $this->grabArticle($this->body);
- }
- else {
- return false;
- }
- }
- return $articleContent;
- }
-
- /**
- * Remove script tags from document
- *
- * @param DOMElement
- * @return void
- */
- public function removeScripts($doc) {
- $scripts = $doc->getElementsByTagName('script');
- for($i = $scripts->length-1; $i >= 0; $i--)
- {
- $scripts->item($i)->parentNode->removeChild($scripts->item($i));
- }
- }
-
- /**
- * Get the inner text of a node.
- * This also strips out any excess whitespace to be found.
- *
- * @param DOMElement $
- * @param boolean $normalizeSpaces (default: true)
- * @return string
- **/
- public function getInnerText($e, $normalizeSpaces=true) {
- $textContent = '';
-
- if (!isset($e->textContent) || $e->textContent == '') {
- return '';
- }
-
- $textContent = trim($e->textContent);
-
- if ($normalizeSpaces) {
- return preg_replace($this->regexps['normalize'], ' ', $textContent);
- } else {
- return $textContent;
- }
- }
-
- /**
- * Get the number of times a string $s appears in the node $e.
- *
- * @param DOMElement $e
- * @param string - what to count. Default is ","
- * @return number (integer)
- **/
- public function getCharCount($e, $s=',') {
- return substr_count($this->getInnerText($e), $s);
- }
-
- /**
- * Remove the style attribute on every $e and under.
- *
- * @param DOMElement $e
- * @return void
- */
- public function cleanStyles($e) {
- if (!is_object($e)) return;
- $elems = $e->getElementsByTagName('*');
- foreach ($elems as $elem) {
- $elem->removeAttribute('style');
- }
- }
-
- /**
- * 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 DOMElement $e
- * @return number (float)
- */
- public function getLinkDensity($e) {
- $links = $e->getElementsByTagName('a');
- $textLength = strlen($this->getInnerText($e));
- $linkLength = 0;
- for ($i=0, $il=$links->length; $i < $il; $i++)
- {
- $linkLength += strlen($this->getInnerText($links->item($i)));
- }
- if ($textLength > 0) {
- return $linkLength / $textLength;
- } else {
- return 0;
- }
- }
-
- /**
- * Get an elements class/id weight. Uses regular expressions to tell if this
- * element looks good or bad.
- *
- * @param DOMElement $e
- * @return number (Integer)
- */
- public function getClassWeight($e) {
- if(!$this->flagIsActive(self::FLAG_WEIGHT_CLASSES)) {
- return 0;
- }
-
- $weight = 0;
-
- /* Look for a special classname */
- if ($e->hasAttribute('class') && $e->getAttribute('class') != '')
- {
- if (preg_match($this->regexps['negative'], $e->getAttribute('class'))) {
- $weight -= 25;
- }
- if (preg_match($this->regexps['positive'], $e->getAttribute('class'))) {
- $weight += 25;
- }
- }
-
- /* Look for a special ID */
- if ($e->hasAttribute('id') && $e->getAttribute('id') != '')
- {
- if (preg_match($this->regexps['negative'], $e->getAttribute('id'))) {
- $weight -= 25;
- }
- if (preg_match($this->regexps['positive'], $e->getAttribute('id'))) {
- $weight += 25;
- }
- }
- return $weight;
- }
-
- /**
- * Remove extraneous break tags from a node.
- *
- * @param DOMElement $node
- * @return void
- */
- public function killBreaks($node) {
- $html = $node->innerHTML;
- $html = preg_replace($this->regexps['killBreaks'], '<br />', $html);
- $node->innerHTML = $html;
- }
-
- /**
- * Clean a node of all elements of type "tag".
- * (Unless it's a youtube/vimeo video. People love movies.)
- *
- * Updated 2012-09-18 to preserve youtube/vimeo iframes
- *
- * @param DOMElement $e
- * @param string $tag
- * @return void
- */
- public function clean($e, $tag) {
- $targetList = $e->getElementsByTagName($tag);
- $isEmbed = ($tag == 'iframe' || $tag == 'object' || $tag == 'embed');
-
- for ($y=$targetList->length-1; $y >= 0; $y--) {
- /* Allow youtube and vimeo videos through as people usually want to see those. */
- if ($isEmbed) {
- $attributeValues = '';
- for ($i=0, $il=$targetList->item($y)->attributes->length; $i < $il; $i++) {
- $attributeValues .= $targetList->item($y)->attributes->item($i)->value . '|'; // DOMAttr? (TODO: test)
- }
-
- /* First, check the elements attributes to see if any of them contain youtube or vimeo */
- if (preg_match($this->regexps['video'], $attributeValues)) {
- continue;
- }
-
- /* Then check the elements inside this element for the same. */
- if (preg_match($this->regexps['video'], $targetList->item($y)->innerHTML)) {
- continue;
- }
- }
- $targetList->item($y)->parentNode->removeChild($targetList->item($y));
- }
- }
-
- /**
- * 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.
- *
- * @param DOMElement $e
- * @param string $tag
- * @return void
- */
- public function cleanConditionally($e, $tag) {
- if (!$this->flagIsActive(self::FLAG_CLEAN_CONDITIONALLY)) {
- return;
- }
-
- $tagsList = $e->getElementsByTagName($tag);
- $curTagsLength = $tagsList->length;
-
- /**
- * Gather counts for other typical elements embedded within.
- * Traverse backwards so we can remove nodes at the same time without effecting the traversal.
- *
- * TODO: Consider taking into account original contentScore here.
- */
- for ($i=$curTagsLength-1; $i >= 0; $i--) {
- $weight = $this->getClassWeight($tagsList->item($i));
- $contentScore = ($tagsList->item($i)->hasAttribute('readability')) ? (int)$tagsList->item($i)->getAttribute('readability') : 0;
-
- $this->dbg('Cleaning Conditionally ' . $tagsList->item($i)->tagName . ' (' . $tagsList->item($i)->getAttribute('class') . ':' . $tagsList->item($i)->getAttribute('id') . ')' . (($tagsList->item($i)->hasAttribute('readability')) ? (' with score ' . $tagsList->item($i)->getAttribute('readability')) : ''));
-
- if ($weight + $contentScore < 0) {
- $tagsList->item($i)->parentNode->removeChild($tagsList->item($i));
- }
- else if ( $this->getCharCount($tagsList->item($i), ',') < 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.
- **/
- $p = $tagsList->item($i)->getElementsByTagName('p')->length;
- $img = $tagsList->item($i)->getElementsByTagName('img')->length;
- $li = $tagsList->item($i)->getElementsByTagName('li')->length-100;
- $input = $tagsList->item($i)->getElementsByTagName('input')->length;
- $a = $tagsList->item($i)->getElementsByTagName('a')->length;
-
- $embedCount = 0;
- $embeds = $tagsList->item($i)->getElementsByTagName('embed');
- for ($ei=0, $il=$embeds->length; $ei < $il; $ei++) {
- if (preg_match($this->regexps['video'], $embeds->item($ei)->getAttribute('src'))) {
- $embedCount++;
- }
- }
- $embeds = $tagsList->item($i)->getElementsByTagName('iframe');
- for ($ei=0, $il=$embeds->length; $ei < $il; $ei++) {
- if (preg_match($this->regexps['video'], $embeds->item($ei)->getAttribute('src'))) {
- $embedCount++;
- }
- }
-
- $linkDensity = $this->getLinkDensity($tagsList->item($i));
- $contentLength = strlen($this->getInnerText($tagsList->item($i)));
- $toRemove = false;
-
- if ($this->lightClean) {
- $this->dbg('Light clean...');
- if ( ($img > $p) && ($img > 4) ) {
- $this->dbg(' more than 4 images and more image elements than paragraph elements');
- $toRemove = true;
- } else if ($li > $p && $tag != 'ul' && $tag != 'ol') {
- $this->dbg(' too many <li> elements, and parent is not <ul> or <ol>');
- $toRemove = true;
- } else if ( $input > floor($p/3) ) {
- $this->dbg(' too many <input> elements');
- $toRemove = true;
- } else if ($contentLength < 10 && ($embedCount === 0 && ($img === 0 || $img > 2))) {
- $this->dbg(' content length less than 10 chars, 0 embeds and either 0 images or more than 2 images');
- $toRemove = true;
- } else if($weight < 25 && $linkDensity > 0.2) {
- $this->dbg(' weight smaller than 25 and link density above 0.2');
- $toRemove = true;
- } else if($a > 2 && ($weight >= 25 && $linkDensity > 0.5)) {
- $this->dbg(' more than 2 links and weight above 25 but link density greater than 0.5');
- $toRemove = true;
- } else if($embedCount > 3) {
- $this->dbg(' more than 3 embeds');
- $toRemove = true;
- }
- } else {
- $this->dbg('Standard clean...');
- if ( $img > $p ) {
- $this->dbg(' more image elements than paragraph elements');
- $toRemove = true;
- } else if ($li > $p && $tag != 'ul' && $tag != 'ol') {
- $this->dbg(' too many <li> elements, and parent is not <ul> or <ol>');
- $toRemove = true;
- } else if ( $input > floor($p/3) ) {
- $this->dbg(' too many <input> elements');
- $toRemove = true;
- } else if ($contentLength < 25 && ($img === 0 || $img > 2) ) {
- $this->dbg(' content length less than 25 chars and 0 images, or more than 2 images');
- $toRemove = true;
- } else if($weight < 25 && $linkDensity > 0.2) {
- $this->dbg(' weight smaller than 25 and link density above 0.2');
- $toRemove = true;
- } else if($weight >= 25 && $linkDensity > 0.5) {
- $this->dbg(' weight above 25 but link density greater than 0.5');
- $toRemove = true;
- } else if(($embedCount == 1 && $contentLength < 75) || $embedCount > 1) {
- $this->dbg(' 1 embed and content length smaller than 75 chars, or more than one embed');
- $toRemove = true;
- }
- }
-
- if ($toRemove) {
- //$this->dbg('Removing: '.$tagsList->item($i)->innerHTML);
- $tagsList->item($i)->parentNode->removeChild($tagsList->item($i));
- }
- }
- }
- }
-
- /**
- * Clean out spurious headers from an Element. Checks things like classnames and link density.
- *
- * @param DOMElement $e
- * @return void
- */
- public function cleanHeaders($e) {
- for ($headerIndex = 1; $headerIndex < 3; $headerIndex++) {
- $headers = $e->getElementsByTagName('h' . $headerIndex);
- for ($i=$headers->length-1; $i >=0; $i--) {
- if ($this->getClassWeight($headers->item($i)) < 0 || $this->getLinkDensity($headers->item($i)) > 0.33) {
- $headers->item($i)->parentNode->removeChild($headers->item($i));
- }
- }
- }
- }
-
- public function flagIsActive($flag) {
- return ($this->flags & $flag) > 0;
- }
-
- public function addFlag($flag) {
- $this->flags = $this->flags | $flag;
- }
-
- public function removeFlag($flag) {
- $this->flags = $this->flags & ~$flag;
- }
-
- /**
- * Will recreate previously deleted body property
- *
- * @return void
- */
- protected function reinitBody() {
- if (!isset($this->body->childNodes)) {
- $this->body = $this->dom->createElement('body');
- $this->body->innerHTML = $this->bodyCache;
- }
- }
-
-}
-?>
projects / tt-rss.git / commitdiff