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PHPLeafNode.php
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PHPLeafNode.php
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<?php
define('EMPTY_STRING','');
define('STRIP_UPPER_TAG',true);
define('DO_NOT_STRIP_UPPER_TAG',false);
class PHPLeafNode{
private $html;
private $tags = array();
public $result = array();
public function __construct($html,$flag){
if($flag==DO_NOT_STRIP_UPPER_TAG){
//$noisestart = microtime(true);
$this->html = self::removeNoise($html);
//echo "Noise takes = ".(microtime(true)-$noisestart)."\n";
//$whitespacestart = microtime(true);
$this->html = self::removeWhitespaceOrNewline($this->html);
//echo "Whitespace removal takes = ".(microtime(true)-$whitespacestart)."\n";
/*
functions to correct entire DOM; particularly in situations where there will be
any word between <a>any word</b>, <a>any word<a>, <a>any word<b>, </b>anyword</b>, </b>any word,
any word<a>, </b>any word </a>, </b>any word<a>, </b>any word<b>
*/
//$correctdomstart = microtime(true);
//self::correctDom1(); will be uncommented later, this requires multiprocessing with pthreads
self::correctDom2();
self::correctDom3();
self::correctDom4();
self::correctDom5();
self::correctDom6();
self::correctDom7();
//echo "CorrectDom takes = ".(microtime(true)-$correctdomstart)."\n";
//$getalltagstart = microtime(true);
$this->tags = self::getAllTag($this->html);
//echo "Getalltag takes = ".(microtime(true)-$getalltagstart)."\n";
}
else{
$html1 = self::stripHtml($html,$flag);
$this->tags = self::getAllTag($html1);
$this->html = $html1;
}
}
public function scraperSet($html,$flag){
$html1 = $this->stripHtml($html,$flag);
$this->tags = $this->getAllTag($html1);
$this->html = $html1;
}
public function removeWhitespaceOrNewline($html){
$html1 = preg_replace('~^[\r\n\s\t]+~is',EMPTY_STRING,$html);
$html1 = preg_replace('~[\r\n\s\t]+$~is',EMPTY_STRING,$html1);
$html1 = preg_replace('~>[\r\n\s\t]+([^<]*)[\r\n\s\t]+<~is','>$1<',$html1);
$html1 = preg_replace('~>[\r\n\s\t]+<~is','><',$html1);
return $html1;
}
public function removeNoise($html){
$html1 = preg_replace('~\<\;~is','<',$html);
$html1 = preg_replace('~\>\;~is','>',$html1);
$html1 = preg_replace('~\"\;~is','"',$html1);
$html1 = preg_replace('~<\s*code[^>]*>[\r\n\s\t]*.*?[\r\n\s\t]*<\s*/\s*code\s*>~is',EMPTY_STRING,$html1);
$html1 = preg_replace('~<\s*code\s*>[\r\n\s\t]*.*?[\r\n\s\t]*<\s*/\s*code\s*>~is',EMPTY_STRING,$html1);
$html1 = preg_replace('~<\s*code[^>]*[^/]>[\r\n\s\t]*.*?[\r\n\s\t]*<\s*/\s*code\s*>~is',EMPTY_STRING,$html1);
$html1 = preg_replace('~<\s*script[^>]*>[\r\n\s\t]*.*?[\r\n\s\t]*<\s*/\s*script\s*>~is',EMPTY_STRING,$html1);
$html1 = preg_replace('~<\s*script\s*>[\r\n\s\t]*.*?[\r\n\s\t]*<\s*/\s*script\s*>~is',EMPTY_STRING,$html1);
$html1 = preg_replace('~<\s*script[^>]*[^/]>[\r\n\s\t]*.*?[\r\n\s\t]*<\s*/\s*script\s*>~is',EMPTY_STRING,$html1);
$html1 = preg_replace('~<\s*style[^>]*>[\r\n\s\t]*.*?[\r\n\s\t]*<\s*/\s*style\s*>~is',EMPTY_STRING,$html1);
$html1 = preg_replace('~<\s*style\s*>[\r\n\s\t]*.*?[\r\n\s\t]*<\s*/\s*style\s*>~is',EMPTY_STRING,$html1);
$html1 = preg_replace('~<\s*style[^>]*[^/]>[\r\n\s\t]*.*?[\r\n\s\t]*<\s*/\s*style\s*>~is',EMPTY_STRING,$html1);
$html1 = preg_replace('~<\s*noscript[^>]*>[\r\n\s\t]*.*?[\r\n\s\t]*<\s*/\s*noscript\s*>~is',EMPTY_STRING,$html1);
$html1 = preg_replace('~<\s*noscript\s*>[\r\n\s\t]*.*?[\r\n\s\t]*<\s*/\s*noscript\s*>~is',EMPTY_STRING,$html1);
$html1 = preg_replace('~<\s*noscript[^>]*[^/]>[\r\n\s\t]*.*?[\r\n\s\t]*<\s*/\s*noscript\s*>~is',EMPTY_STRING,$html1);
$html1 = preg_replace('~<!--[\r\n\s\t]*(.*?)[\r\n\s\t]*-->~is',EMPTY_STRING,$html1);
$html1 = preg_replace('~<!\[CDATA\[(.*?)\]\]>~is','$1',$html1);
$html1 = preg_replace('~<!\[if(.*?)\]>(.*?)<!\[endif\](--)?>~is',EMPTY_STRING,$html1);
$html1 = preg_replace('~<![^>]*>~is',EMPTY_STRING,$html1);
$html1 = preg_replace('~<link[^>]*>~is',EMPTY_STRING,$html1);
$html1 = preg_replace('~</?br\s*/?>~is',EMPTY_STRING,$html1);
$html1 = preg_replace('~=\s*\'\s*\'~is','=\'.\'',$html1); //add . into attributes with empty value '' to avoid error when processing correctDom1
$html1 = preg_replace('~=\s*"\s*"~is','="."',$html1); //add . into attributes with empty value "" to avoid error when processing correctDom1
return $html1;
}
public function hasChildNode($html){
$tag = $this->getAllTag($html);
unset($tag[0]);
$tag = array_values($tag);
$result = false;
foreach($tag as $k=>$v){
if(preg_match('~<[\w]+[^>]*>~is',$v,$mtch)){
$result = true;
break;
}
}
return $result;
}
public function getLeaf($el){
$tag = $this->getAllTag($el);
if((preg_match('~<video[^>]*>~is',$tag[0],$mm1)||preg_match('~<svg[^>]*>~is',$tag[0],$mm2)||preg_match('~<canvas[^>]*>~is',$tag[0],$mm4))
||(preg_match('~<a\s+([^>]*)>~is',$tag[0],$mm3)&&$this->hasChildNode($el))){
$this->result[] = $el;
}
else{
if($this->hasChildNode($el)){
$this->scraperSet($el,STRIP_UPPER_TAG);
$children = $this->getChildren();
$size = count($children);
for($i=0;$i<$size;$i++){
$this->getLeaf($children[$i]);
}
}
else{
$this->result[] = $el;
}
}
}
public function stripHtml($html,$flag){
if($flag==STRIP_UPPER_TAG){
$tags = $this->getAllTag($html);
$start = $tags[0];
$html1 = substr($html,strlen($start),strlen($html));
if(preg_match("~<(\w+)[^>]*>~is",$start,$matches)){
$end = "</".$matches[1].">";
$mtch = substr($html1,0,(strlen($html1)-strlen($end)));
return $this->removeWhitespaceOrNewline($mtch);
}
else
return $html1;
}
}
public function getChildren(){
$size = count($this->tags);
$children = array();
$tags = $this->tags;
$html = $this->html;
if($size>1){
for($i=0;$i<$size;$i++){
if(preg_match("~<(\w+)[^>]*>~is",$tags[$i],$matches)){
$start = $matches[1];
if($size>1){
$end = "</".$start.">";
$close = 1;
for($j=($i+1);$j<$size;$j++){
if(preg_match("~<(\w+)[^>]*>~is",$tags[$j],$matches1)){
$start1 = $matches1[1];
if($start1==$start){
$close++;
}
}
else{
if(preg_match("~".$end."~is",$tags[$j])){
$close--;
if($close==0){
$i = $j;
$_array = explode($end,$html);
$sum = 0;
$str='';
$_size = count($_array);
for($index=0;$index<$_size;$index++){
$s = preg_replace('~\s*~','',$_array[$index]);
$c_tag = 0;
if(!empty($s)){
$tag = $this->getAllTag($_array[$index]);
$c_tag = count($tag);
}
$str=$str.$_array[$index].$end;
$sum+=$c_tag+1;
if($sum==($i+1)){
if(preg_match('~^<'.$start.'[^>]*>(.*?)'.$end.'~is',$str,$match)){
$children[] = $str;
$html = substr($html,strlen($str),strlen($html));
for($k=0;$k<=$i;$k++){
unset($tags[$k]);
}
$tags = array_values($tags);
$i = -1;
$size = count($tags);
}
break;
}
}
break;
}
}
}
if($j==($size-1)&&$close>0){
$children[] = $tags[$i];
$html = substr($html,strlen($tags[$i]),strlen($html));
unset($tags[$i]);
$tags = array_values($tags);
$size = count($tags);
$i = -1;
$close = 0;
break;
}
}
}
else{
$children[] = $tags[$i];
$html = substr($html,strlen($tags[$i]),strlen($html));
unset($tags[$i]);
$tags = array_values($tags);
$size = count($tags);
$close = 0;
}
}
else{
$html = substr($html,strlen($tags[$i]),strlen($html));
unset($tags[$i]);
$tags = array_values($tags);
$i = -1;
$size = count($tags);
}
}
}
else{
if(!preg_match('~</\w+>~is',$tags[0],$mm))
$children[] = $tags[0];
}
return $children;
}
public function getAllTag($html){
$tags = array();
if(preg_match_all('~(?!<\s*>)\<(?:(?>[^<>]+)|(?R))*\>~im',$html,$matchall,PREG_SET_ORDER)){
foreach($matchall as $m){
$tags[] = $m[0];
}
}
else
$tags[] = $html;
return $tags;
}
public function correctDom1(){
try{
//expression to get anything within ='anything' or ="anything" followed by " or '
if(preg_match_all('~(((?<==\')(.(?!\'))*(\W|\w*))\')|(((?<==")(.(?!"))*(\W|\w*))\")~im',$this->html,$matchall,PREG_SET_ORDER)){
foreach($matchall as $m){ //loop each match
if(preg_match('~\<~is',$m[0],$mtch1)||preg_match('~\>~is',$m[0],$mtch2)){ //if match contains < or >, also ignore match without < or >
//get ending character which may be " or '
$end = $m[0][(strlen($m[0])-1)];
$replace1 = substr($m[0],0,(strlen($m[0])-1)); //omit ending character
//replace symbol to special character
$replace = preg_replace('~"~is','"',$replace1);
$replace = preg_replace('~<~is','<',$replace);
$replace = preg_replace('~>~is','>',$replace);
$replace = preg_replace('~\'~is',''',$replace);
/*
escape delimiter in preg_quote in order to reach end of delimiter, then do the replacement of
old pattern to new replacement value
*/
$this->html = preg_replace("~".preg_quote(($end.$replace1.$end),'~')."~is",$end.$replace.$end,$this->html);
}
}
}
}
catch(Exception $ex){
//echo $ex;
}
}
//function to enclose any word between <a>any word</b> into <span>any word<span> to form <a><span>any word</span></b>
public function correctDom2(){
try{
//negative lookbehind expression to match <a>any word</b>
if(preg_match_all('~(?!<(\w+)[^>]*>[^><]*</\1>)<(\w+)[^>]*>([^><]+)</\w+>~is',$this->html,$matchall,PREG_SET_ORDER)){
foreach($matchall as $m){
$tags = $this->getAllTag($m[0]); //get all tags
$s = preg_replace('~\s*~','',$m[3]); //remove whitespace
if(!empty($s)){ //is not empty then if length is greater than 0
$str = $tags[0].'<notag>'.$m[3].'</notag>'.$tags[1]; //form <a><span>any word</span></b>
$str = $this->removeWhitespaceOrNewline($str); //remove any whitespace or new line in new replacement value
$this->html = str_replace($m[0],$str,$this->html); //replace <a>any word</b> to <a><span>any word</span></b>
}
}
}
}
catch(Exception $ex){
//echo $ex;
}
}
public function correctDom3(){
try{
if(preg_match_all('~(?=(</\w+>([^><]+)</\w+>))~is',$this->html,$matchall,PREG_SET_ORDER)){
foreach($matchall as $m){
$tags = $this->getAllTag($m[1]);
$s = preg_replace('~\s*~','',$m[2]);
if(!empty($s)){
$str = $tags[0].'<notag>'.$m[2].'</notag>'.$tags[1];
$str = $this->removeWhitespaceOrNewline($str);
$this->html = str_replace($m[1],$str,$this->html);
}
}
}
}
catch(Exception $ex){
//echo $ex;
}
}
public function correctDom4(){
try{
if(preg_match_all('~(?=(<\w+[^>]*>([^><]+)<\w+[^>]*>))~is',$this->html,$matchall,PREG_SET_ORDER)){
foreach($matchall as $m){
$tags = $this->getAllTag($m[1]);
$s = preg_replace('~\s*~','',$m[2]);
if(!empty($s)){
$str = $tags[0].'<notag>'.$m[2].'</notag>'.$tags[1];
$str = $this->removeWhitespaceOrNewline($str);
$this->html = str_replace($m[1],$str,$this->html);
}
}
}
}
catch(Exception $ex){
//echo $ex;
}
}
public function correctDom5(){
try{
if(preg_match('~^[^><]+~is',$this->html,$m)){
$s = preg_replace('~\s*~','',$m[0]);
if(!empty($s))
$this->html=preg_replace('~^([^><]+)~is','<notag>$1</notag>',$this->html);
}
}
catch(Exception $ex){
//echo $ex;
}
}
public function correctDom6(){
try{
if(preg_match_all('~</\w+>([^><]+)<\w+[^>]*>~is',$this->html,$matchall,PREG_SET_ORDER)){
foreach($matchall as $m){
$tags = $this->getAllTag($m[0]);
$s = preg_replace('~\s*~','',$m[1]);
if(!empty($s)){
$str = $tags[0].'<notag>'.$m[1].'</notag>'.$tags[1];
$str = $this->removeWhitespaceOrNewline($str);
$this->html = str_replace($m[0],$str,$this->html);
}
}
}
}
catch(Exception $ex){
//echo $ex;
}
}
public function correctDom7(){
try{
if(preg_match('~=\'.\'~is',$this->html,$m)){
$this->html = preg_replace('~=\'.\'~is','=\'\'',$this->html);
}
if(preg_match('~="."~is',$this->html,$m)){
$this->html = preg_replace('~="."~is','=""',$this->html);
}
}
catch(Exception $ex){
//echo $ex;
}
}
public function getValues(){
$children = $this->getChildren();
//$loopstart = microtime(true);
$size = count($children);
for($i=0;$i<$size;$i++){
$this->getLeaf($children[$i]);
}
//echo 'Loop takes = '.(microtime(true)-$loopstart)."\n";
return $this->result;
}
public function file_url_contents($url){
$html = file_get_contents($url);
return $html;
}
}
?>