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' -* echo "\n\n"; -* -* // set innerHTML -* $elem->innerHTML = 'FiveFilters.org'; -* echo $elem->innerHTML; // prints 'FiveFilters.org' -* echo "\n\n"; -* -* // print document (with our changes) -* echo $doc->saveXML(); -* @endcode -* -* @author Keyvan Minoukadeh - http://www.keyvan.net - keyvan@keyvan.net -* @see http://fivefilters.org (the project this was written for) -*/ -class JSLikeHTMLElement extends DOMElement -{ - /** - * Used for setting innerHTML like it's done in JavaScript: - * @code - * $div->innerHTML = 'The story begins...
'; - * @endcode - */ - public function __set($name, $value) { - if ($name == 'innerHTML') { - // first, empty the element - for ($x=$this->childNodes->length-1; $x>=0; $x--) { - $this->removeChild($this->childNodes->item($x)); - } - // $value holds our new inner HTML - if ($value != '') { - $f = $this->ownerDocument->createDocumentFragment(); - // appendXML() expects well-formed markup (XHTML) - $result = @$f->appendXML($value); // @ to suppress PHP warnings - if ($result) { - if ($f->hasChildNodes()) $this->appendChild($f); - } else { - // $value is probably ill-formed - $f = new DOMDocument(); - $value = mb_convert_encoding($value, 'HTML-ENTITIES', 'UTF-8'); - // Using', $html); - $html = preg_replace($this->regexps['replaceFonts'], '<$1span>', $html); - $html = mb_convert_encoding($html, 'HTML-ENTITIES', "UTF-8"); - if (trim($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 = '
Sorry, Readability was unable to parse this page for content.
'; - } - - $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, '').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'); - $footnotesWrapper->innerHTML = '
tags, etc.
- *
- * @param DOMElement
- * @return void
- */
- function prepArticle($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('/ innerHTML);
- //articleContent.innerHTML = articleContent.innerHTML.replace(/ 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'], '
', $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 or
');
- $toRemove = true;
- } else if ( $input > floor($p/3) ) {
- $this->dbg(' too many 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
or
');
- $toRemove = true;
- } else if ( $input > floor($p/3) ) {
- $this->dbg(' too many 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;
- }
- }
-
-}
-?>