/**
* @param string $specialClass
* @return \Illagrenan\Navigation\NavigationNode
*/
public function addSpecialClass($specialClass)
{
if (Validators::isUnicode($specialClass) === FALSE) {
throw new Exceptions\InvalidSpecialClassException("Given \"" . $specialClass . "\" is not valid special class.");
}
$specialClass = Strings::trim($specialClass);
$specialClass = Strings::normalize($specialClass);
$specialClass = Strings::toAscii($specialClass);
$this->specialClass[] = $specialClass;
return $this;
}
