/**
* Helper function to find the next element and return its
* complete definition including opening and closing tag.
*
* THIS FUNCTION DOES NOT HANDLE ELEMENTS WHICH CAN BE NESTED IN THEMSELVES!!!
*
* @param $element On success $element carries the name of the found element
* @param $xmlCode The XML code to search through
* @return string Found element or NULL
*/
public static function getNextElement(&$element, $xmlCode, &$endPos = NULL)
{
if (empty($xmlCode)) {
return NULL;
}
$pos = 0;
$max = strlen($xmlCode);
// Search the opening tag first.
while ($pos < $max) {
$start = strpos($xmlCode, '<', $pos);
if ($start === false) {
// Nothing found.
return NULL;
}
if (XMLUtil::isValidXMLName($xmlCode[$start + 1])) {
// Extract element name.
$read = $start + 1;
$found_element = '';
while (XMLUtil::isValidXMLName($xmlCode[$read])) {
$found_element .= $xmlCode[$read];
$read++;
if ($read >= $max) {
return NULL;
}
}
$elementLength = strlen($found_element);
$next = $xmlCode[$start + $elementLength + 1];
if ($next == '/' || $next == '>' || ctype_space($next)) {
// Found it.
break;
}
$pos = $start + $elementLength;
} else {
// Skip this one.
$pos = $start + 2;
}
}
$pos = $start + $elementLength;
// Search next '>'.
$angle = strpos($xmlCode, '>', $pos);
if ($angle === false) {
// Opening tag is not terminated.
return NULL;
}
$pos = $angle + 1;
// Is this already the end?
if ($xmlCode[$angle - 1] == '/') {
// Yes.
$endPos = $angle + 1;
$element = $found_element;
return substr($xmlCode, $start, $angle - $start + 1);
}
// Now, search closing tag.
// (Simple solution which expects there are no child elements
// with the same name. This means we assume the element can not
// be nested in itself!)
$end = strpos($xmlCode, '</' . $found_element . '>', $pos);
if ($end === false) {
return NULL;
}
$end += 3 + $elementLength;
// Found closing tag.
$endPos = $end;
$element = $found_element;
return substr($xmlCode, $start, $end - $start);
}
