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another PCRE question: need to match either display:none or visibility:hidden in the style attribute.

Posted on 2011-09-09
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Last Modified: 2012-06-21
hi there, the style attribute is retrieved using the php html dom class. i have used a regular expression to find either or, as in line 7 of the following function:
function ishidden($name,$html) {
	$str = str_get_html($html);
	$parent = $str->find("[name=".$name."]",0);
	while ($parent = $parent->parent()) {
		if (preg_match("/(display|visibility)\s*:\s*(none|hidden)/i",$parent->$style,$match)) {
			//print_r($parent);
			echo "style = ".$parent->$style."\n";
			return $match[0];
		}
	}
	return false;
}

function getforms($html) {
	/*
	- load form as:
	  array(
	   [type],
	   [name],
	   [value],
	   [checked],
	   [disabled]
	  );
	*/
	$ret = array();
	$forms = array();
	preg_match_all("/\<form [^\>]+\>.*\<\/form\>/ims",
			$html,
			$out);
	//print_r($out);
	foreach ($out[0] as $form) {
		array_push($forms,$form);
	}
	foreach ($forms as $form) {
		//echo $form."\n";
		$pattern = '/<(form)(?=(?:[^>]*name="([^"]*))?)(?=(?:[^>]*action="([^"]*))?)' .
				 '|<(input)(?=(?:[^>]*type="([^"]*))?)(?=(?:[^>]*name="([^"]*))?)(?=(?:[^>]*value="([^"]*))?)(?=(?:[^>]*checked="([^"]*))?)(?=(?:[^>]*disabled="([^"]*))?)' .
				 '|<(textarea)(?=(?:[^>]*name="([^"]*))?)[^>]*>([^<]|<(?!\/textarea))(?=(?:[^>]*disabled="([^"]*))?)' .
				 '|<(select)(?=(?:[^>]*name="([^"]*))?)(?=(?:[^>]*disabled="([^"]*))?)' .
				 '|<(button)(?=(?:[^>]*name="([^"]*))?)(?=(?:[^>]*disabled="([^"]*))?)/i';
		//$pattern = '/\<(form).*name="([^"]+)".*action="([^")".*\>'.
		//		 '|\<(input).*type="([^"]+)".*name="([^"]+)".*value="([^"]+)".*checked="([^"]+)".*\/\>'.
		//		 '|\<(textarea).*name="([^"]+)".*\>(.*)*\<\/textarea\>'.
		//		 '|<(select).*name="([^"]+)".*>'.
		//		 '|<(button).*name="([^"]+)".*value="([^"]+)".*>/ims';
		preg_match_all($pattern,
					$form,
					$out,
					PREG_SET_ORDER);
		$out = array_non_empty_items($out);
		$i = 0;
		foreach ($out as $element) {
			$ret[$i] = array();
			switch ($element[1]) {
				case "form":
					array_push($ret[$i], array(
										"type"	=>	$element[1],
										"name"	=>	$element[2],
										"action"	=>	$element[3]
									)
								);
					break;
				case "input":
					array_push($ret[$i], array(
										"input"	=>	$element[1],
										"type"	=>	$element[2],
										"name"	=>	$element[3],
										"value"	=>	$element[4],
										"checked"	=>	((($element[2]=="radio"||$element[2]=="checkbox")?true:false)?"true":"false"),
										"disabled"=>	(($element[2]=="radio"||$element[2]=="checkbox")?(($element[6]=="true"||$element[6]=="disabled")?true:false):(($element[5]=="true"||$element[5]=="disabled")?true:false))||(ishidden($element[3],$form))?"true":"false"
									)
								);
					print_r(ishidden($element[3],$form));
					break;
				case "textarea":
					array_push($ret[$i], array(
										"input"	=>	$element[1],
										"name"	=>	$element[2],
										"value"	=>	$element[3],
										"disabled"=>	($element[4]=="true"||$element[4]=="disabled"||ishidden($element[2],$form))?"true":"false"
									)
								);
					break;
				case "select":
					array_push($ret[$i], array(
										"input"	=>	$element[1],
										"name"	=>	$element[2],
										"value"	=>	getoption($element[2],$form),
										"disabled"=>	($element[4]=="true"||$element[4]=="disabled"||ishidden($element[2],$form))?"true":"false"
									)
								);
					break;
				case "button":
					array_push($ret[$i], array(
										"input"	=>	$element[1],
										"name"	=>	$element[2],
										"value"	=>	$element[3],
										"disabled"=>	($element[4]=="true"||$element[4]=="disabled"||ishidden($element[2],$form))?"true":"false"
									)
								);
					break;
			}
			$i++;
		}
	}
	return $ret;
}

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what is wrong with this function or perl compatible regular expression that preg_match uses, that it does not return the expected results? 0o
the topmost parent is as follows within https://lmx.leads360.com/web/Login.aspx, as returned by file_get_contents.
<div id="passwordDialog" style="position:absolute;visibility:hidden;height:;width:;" class="dialog"><div id="passwordDialog_HeaderSpan" class="header">
	
            Forgot Password
        
</div><div id="passwordDialog_InnerSpan" class="content password">
	
            <p>Please enter the email address you signed up with and we will send you a new login link.</p>
            <dl>
                <dt>Email:</dt>
                <dd><input name="emailTextBox" type="text" id="emailTextBox" class="bigtextbox" /></dd>
            </dl>
            <div class="buttons submitcancel">
                <a class="submit left" id="submitPasswordRest" onclick="RequestPasswordReset();">Submit</a>
                <a class="cancel right" onclick="passwordDialog.Close();">Close</a>
            </div>
        
</div><div id="passwordDialog_FooterSpan" class="footer">
	
        
</div></div>

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if anybody can see why this would not be returning true or the matched text in the function ishidden, even be it as result of it's usage - please let me know.
0
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Question by:intellisource
  • 2
2 Comments
 

Accepted Solution

by:
intellisource earned 0 total points
ID: 36510067
lol nvm - misread a reference earlier to retrieving the style attributes as $parent->$style instead of $parent->getAttribute('style') ;)
0
 

Author Closing Comment

by:intellisource
ID: 36510078
working now! i can get the form elements as an array, choose which ones need to be "displayed" for submission - and then compile the POST str ;)
perserverance is KEY! XD
0

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