protected static Xss::split($string, $html_tags, $class)
Processes an HTML tag.
Parameters
string $string: The HTML tag to process.
array $html_tags: An array where the keys are the allowed tags and the values are not used.
string $class: The called class. This method is called from an anonymous function which breaks late static binding. See https://bugs.php.net/bug.php?id=66622 for more information.
Return value
string If the element isn't allowed, an empty string. Otherwise, the cleaned up version of the HTML element.
File
- core/lib/Drupal/Component/Utility/Xss.php, line 141
Class
- Xss
- Provides helper to filter for cross-site scripting.
Namespace
Drupal\Component\Utility
Code
protected static function split($string, $html_tags, $class) {
if (substr($string, 0, 1) != '<') {
// We matched a lone ">" character.
return '>';
}
elseif (strlen($string) == 1) {
// We matched a lone "<" character.
return '<';
}
if (!preg_match('%^<\s*(/\s*)?([a-zA-Z0-9\-]+)\s*([^>]*)>?|(<!--.*?-->)$%', $string, $matches)) {
// Seriously malformed.
return '';
}
$slash = trim($matches[1]);
$elem = &$matches[2];
$attrlist = &$matches[3];
$comment = &$matches[4];
if ($comment) {
$elem = '!--';
}
// When in whitelist mode, an element is disallowed when not listed.
if ($class::needsRemoval($html_tags, $elem)) {
return '';
}
if ($comment) {
return $comment;
}
if ($slash != '') {
return "</$elem>";
}
// Is there a closing XHTML slash at the end of the attributes?
$attrlist = preg_replace('%(\s?)/\s*$%', '\1', $attrlist, -1, $count);
$xhtml_slash = $count ? ' /' : '';
// Clean up attributes.
$attr2 = implode(' ', $class::attributes($attrlist));
$attr2 = preg_replace('/[<>]/', '', $attr2);
$attr2 = strlen($attr2) ? ' ' . $attr2 : '';
return "<$elem$attr2$xhtml_slash>";
}
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