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<?php
/**
* class:wpAutomaticDom to extract content from html using class, id, regex or xpath
* @author ValvePress
* @version:1.0.0
*/
class wpAutomaticDom {
public $html;
public $doc;
public $debug;
function __construct($html){
//make sure encoding exits
if( stristr($html, '<meta http-equiv="Content-Type" content="text/html; charset') || stristr($html, '<meta http-equiv="content-type" content="text/html; charset')){
//correct
}else{
//not correct find the charset
preg_match_all('{charset=["|\']([^"]+?)["|\']}i', $html,$encMatches);
$possibleCharSet = $encMatches[1];
$possibleCharSet = isset($possibleCharSet[0]) ? $possibleCharSet[0] : '';
if(trim($possibleCharSet) == '') $possibleCharSet = 'UTF-8';
$charSetMeta = '<meta http-equiv="content-type" content="text/html; charset=' . $possibleCharSet . '"/>';
if(stristr($html, '<head>')){
$html = str_replace('<head>', '<head>'.$charSetMeta, $html);
}else{
$html = str_replace('</head>', $charSetMeta . '/<head>', $html);
}
}
// Fix tables tbody
preg_match_all('{(<table.*?>)([\s]*<.*?>)}s', $html ,$allTablesOpenMatches ) ;
$allTablesOpenMatchesTwo = $allTablesOpenMatches[0];
$allTablesOpenMatchesOne = $allTablesOpenMatches[1];
$allTablesOpenMatchesAfter = $allTablesOpenMatches[2];
$i=0;
foreach ($allTablesOpenMatchesTwo as $allTablesOpenMatchesTwoSingle){
if(! stristr($allTablesOpenMatchesTwoSingle, '<tbody') && ! stristr($allTablesOpenMatchesTwoSingle, '<thead')){
//fix this
$html = str_replace($allTablesOpenMatchesTwoSingle, $allTablesOpenMatchesOne[$i].'<tbody>'.$allTablesOpenMatchesAfter[$i], $html);
}
$i++;
}
preg_match_all('{(<[^<]*?>[\s]*)(</table.*?>)}s', $html ,$allTablesCloseMatches ) ;
$allTablesCloseMatchesBoth = $allTablesCloseMatches[0];
$allTablesCloseMatchesPre = $allTablesCloseMatches[1];
$allTablesCloseMatchesAfter = $allTablesCloseMatches[2];
$i=0;
foreach ( $allTablesCloseMatchesBoth as $allTablesCloseMatchesBothSingle ){
if( ! stristr($allTablesCloseMatchesBothSingle, 'tbody') && ! stristr($allTablesCloseMatchesBothSingle, 'tfoot')){
$html = str_replace($allTablesCloseMatchesBothSingle, $allTablesCloseMatchesPre[$i].'</tbody>'.$allTablesCloseMatchesAfter[$i], $html ) ;
}
$i++;
}
$this->html = $html;
$this->doc = new DOMDocument;
try {
$internalErrors = libxml_use_internal_errors(true);
if($html == '') $html = '<html></html>';
@$this->doc->loadHTML($html);
libxml_use_internal_errors($internalErrors);
} catch (Exception $e) {
throw new Exception('Failed to load the Document as a Dom');
}
}
/**
* Get content from the dom using an XPath
* @param string $xpath
* @return string[]
*/
function getContentByXPath($xpath,$inner=true){
// xPath object
$xpathObj = new DOMXPath($this->doc);
$xpathMatches = @$xpathObj->query("$xpath");
$allMatchs= array();
if($xpathMatches == false) return $allMatchs;
foreach ($xpathMatches as $element) {
$matchHtml = ''; // single match html
if($inner){
$nodes = $element->childNodes;
foreach ($nodes as $node) {
$matchHtml.= $this->doc->saveHTML($node). "\n";
}
}else{
$matchHtml = $this->doc->saveHTML($element);
}
//if $matchHtml starts with href=" then remove it and the next "
if(preg_match('{^href="([^"]+?)"}', $matchHtml)){
echo '<br><- href= found removing it';
$matchHtml = preg_replace('{href="([^"]+?)"}', '$1', $matchHtml);
}
$allMatchs[] = $matchHtml;
}
return $allMatchs;
}
/**
* Get childrens by XPath
*/
function getChildsByXPath($xpath){
// xPath object
$xpathObj = new DOMXPath($this->doc);
$xpathMatches = @$xpathObj->query("$xpath");
$allMatchs= array();
if($xpathMatches == false) return $allMatchs;
foreach ($xpathMatches as $element) {
$matchHtml = array(); // single match html
$nodes = $element->childNodes;
foreach ($nodes as $node) {
$matchHtml[] = $this->doc->saveHTML($node) ;
}
$allMatchs[] = $matchHtml;
}
return $allMatchs;
}
/**
* Get content from dom using class name
* @param string $className
* @return string[]
*/
function getContentByClass($className,$inner=true){
$className = trim($className) ;
$XPath= '//*[contains(concat (" ", normalize-space(@class), " "), " '.$className.' ")]';
return $this->getContentByXPath($XPath,$inner) ;
}
/**
* Get content from dom using id
* @param string $id
* @return string[]
*/
function getContentByID($id,$inner=true){
$id=trim($id);
$XPath = "//*[@id='$id']" ;
return $this->getContentByXPath($XPath,$inner) ;
}
/**
* Get default title from title tag or h1 tag
* @return string the title
*/
function getTheTitle(){
//return title from title tag
preg_match('{<title>(.*?)</title>}s', $this->html,$titleMatchs);
$possibleTitle = isset($titleMatchs[1]) ? $titleMatchs[1] : '' ;
if(trim($possibleTitle) != '' ) return trim($possibleTitle);
//get from h1
preg_match('{<h1.*?>(.*?)</h1>}s', $this->html,$titleMatchs);
$possibleTitle = $titleMatchs[1];
if(trim($possibleTitle) != '' ) return trim($possibleTitle);
//default empty
return '';
}
function getFullContent(){
//readability
require_once 'wp_automatic_readability/wp_automatic_Readability.php';
$wp_automatic_Readability = new wp_automatic_Readability ( $this->html );
$wp_automatic_Readability->debug = false;
$result = $wp_automatic_Readability->init ();
if ($result) {
// Redability Content
$content = $wp_automatic_Readability->getContent ()->innerHTML;
// Remove wp_automatic_Readability attributes
$content = preg_replace('{ wp_automatic_Readability\=".*?"}s', '', $content);
// Fix iframe if exists
preg_match_all('{<iframe[^<]*/>}s', $content,$ifrMatches);
$iframesFound = $ifrMatches[0];
foreach ($iframesFound as $iframeFound){
$correctIframe = str_replace('/>','></iframe>',$iframeFound);
$content = str_replace($iframeFound, $correctIframe, $content);
}
// Cleaning redability for better memory
unset($wp_automatic_Readability);
unset($result);
return $content;
}else{
echo '<br>Failed to find the content.';
return '';
}
}
/**
* Extract content by a regex ex <h1>(.*?)</h1>
* @param string $regex
*/
function getContentByRegex($regex){
preg_match_all('{'.$regex.'}is', $this->html,$matchregex);
if(isset($matchregex[1])) return $matchregex[1];
if(isset($matchregex[0])) return $matchregex[0];
}
/**
* Find the link by xPath and all similar links in a page content. used by the multi-page scraper
* Similar links has the same XPath [no digets] and have the similar siblings
* @param string $xpath
* @return array all similar URLs
*/
function getSimilarLinks($xpath){
//refine the xpath and find the a tag
$xpath = trim($xpath);
if(! stristr($xpath, '/a/') && ! preg_match('{/a$}',$xpath) && ! stristr($xpath, '/a[') ){
throw new Exception('Provided XPath does not contain the a tag');
}else{
//good we have the a tag if it is not the last one, make it the last
if(!preg_match('{/a$}', $xpath) && ( stristr($xpath, '/a/') || stristr($xpath, '/a[') ) ){
if(! stristr($xpath, '/a[') ){
$xpathParts = explode('/a/', $xpath);
$lastPartIndex = count($xpathParts) - 1;
unset($xpathParts[$lastPartIndex]);
$xpath=implode('/a/',$xpathParts).'/a';
}else{
$xpath = preg_replace( '!(a\[\d*?\]).*!', "$1", $xpath);
}
}
//find the chosen node
$xpathObj = new DOMXPath($this->doc);
$xpathMatches = @$xpathObj->query("$xpath");
if( isset($xpathMatches[0]) ) {
//well we have a match
$choseNode = $xpathMatches[0];
$chosenNodePath = ($choseNode->getNodePath());
}else{
echo '<br>Failed to get the alleged node, trusting the provided XPath instead';
$chosenNodePath = $xpath;
}
$chosenNodePathNoDigits = preg_replace('{\[\d*?\]}', '[]', $chosenNodePath);
$chosenNodePathParts = explode('/', $chosenNodePath);
echo '<br>Chosen node dom XPath:'.$chosenNodePath;
if($this->debug) print_r($chosenNodePathParts);
//get all links in the dom
$LinksWithSimilarPath = array();
$LinksWithSimilarPathTitles = array();
$LinksWithSimilarPathStrict = array();
$allLinksMatches = @$xpathObj->query("//a");
foreach ($allLinksMatches as $singleLink){
$currentNodePath = $singleLink->getNodePath() ;
$currentNodePathNoDigits = preg_replace('{\[\d*?\]}', '[]', $currentNodePath );
if($currentNodePathNoDigits == $chosenNodePathNoDigits){
$LinksWithSimilarPath[] = $singleLink->getAttribute('href');
$LinksWithSimilarPathTitles[] = $singleLink->nodeValue;
if($this->debug) echo "\n\n<br><br>".$singleLink->getNodePath().'<br><br>'.$singleLink->nodeValue . '<br><br>' ;
//verify num of changes in xPath
$numOfChanges = 0;
$currentNodePathParts = explode('/', $currentNodePath);
$nodeChangeIndex = 0 ; //where exactly there were a change
$i = 0 ;
foreach ($currentNodePathParts as $currentPart){
if($currentPart != $chosenNodePathParts[$i]){
$nodeChangeIndex = $i;
$numOfChanges++;
}
$i++;
}
if($numOfChanges < 2 ){
$LinksWithSimilarPathStrict[] = $singleLink->getAttribute('href');
$LinksWithSimilarPathStrictTitles[] = $singleLink->nodeValue;
$changeIndexArr[] = $nodeChangeIndex;
}
}
}
if($this->debug){
echo "\n<br>------- Strict similar XPath---------\n<br>";
print_r($LinksWithSimilarPathStrict);
print_r($changeIndexArr);
}
if(count($LinksWithSimilarPathStrict) > 5){
//better results are here lets find the odd result if any
$values = array_count_values($changeIndexArr);
arsort($values);
if($this->debug){
echo "\n<br>-------Most common change part index ---------\n<br>";
print_r($values);
}
//fix this line
$changeArrKeys = array_keys($values) ;
$correctNodeIndex = $changeArrKeys[0]; // index of the change
echo "\n<br> All Links:" . count($allLinksMatches) . ", Similar links:".count($LinksWithSimilarPath) . " & Most similar:".count($LinksWithSimilarPathStrict);
if($this->debug)
echo "\n<br> Correct change XPath index:".$correctNodeIndex;
if(is_numeric($correctNodeIndex) ){
foreach ($changeIndexArr as $changeKey => $changeValue){
if($changeValue !=0 && $changeValue != $correctNodeIndex){
unset($LinksWithSimilarPathStrict[$changeKey]);
unset($LinksWithSimilarPathStrictTitles[$changeKey]);
}
}
}
return array($LinksWithSimilarPathStrict ,$LinksWithSimilarPathStrictTitles) ;
}else{
return array($LinksWithSimilarPath , $LinksWithSimilarPathTitles);
}
}
}
//function to take a list of xpaths, find HTML elements matching them and remove them from the DOM then return the new HTML
function removeElementsByXPath($xpathArr){
$xpathObj = new DOMXPath($this->doc);
foreach ($xpathArr as $xpath){
echo '<br>Removing element by XPath: '. htmlentities($xpath);
$xpathMatches = @$xpathObj->query("$xpath");
if(is_array($xpathMatches))
echo ' <--Found '.count($xpathMatches).' matches';
foreach ($xpathMatches as $match){
$match->parentNode->removeChild($match);
}
}
return $this->doc->saveHTML();
}
}