<?php
namespace enshrined\svgSanitize;
class Helper
{
/**
* @param \DOMElement $element
* @return string|null
*/
public static function getElementHref(\DOMElement $element)
{
if ($element->hasAttribute('href')) {
return $element->getAttribute('href');
}
if ($element->hasAttributeNS('http://www.w3.org/1999/xlink', 'href')) {
return $element->getAttributeNS('http://www.w3.org/1999/xlink', 'href');
}
return null;
}
/**
* @param string $href
* @return string|null
*/
public static function extractIdReferenceFromHref($href)
{
if (!is_string($href) || strpos($href, '#') !== 0) {
return null;
}
return substr($href, 1);
}
/**
* @param \DOMElement $needle
* @param \DOMElement $haystack
* @return bool
*/
public static function isElementContainedIn(\DOMElement $needle, \DOMElement $haystack)
{
if ($needle === $haystack) {
return true;
}
foreach ($haystack->childNodes as $childNode) {
if (!$childNode instanceof \DOMElement) {
continue;
}
if (self::isElementContainedIn($needle, $childNode)) {
return true;
}
}
return false;
}
}