protected static function Xss::split

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 '&gt;';
  }
  elseif (strlen($string) == 1) {
    // We matched a lone "<" character.
    return '&lt;';
  }

  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>";
}