protected function _parseStringToken($token, $index)
{
$type = '';
switch ($token) {
case '+':
$type = 'OperatorAddition';
break;
case '-':
$type = 'OperatorSubtraction';
break;
}
if (!empty($type)) {
$mutationClass = 'Mutagenesis\\Mutation\\' . $type;
if (!class_exists($mutationClass)) {
require_once str_replace('\\', '/', ltrim($mutationClass, '\\')) . '.php';
}
$mutation = new $mutationClass($this->getFilename());
return $mutation;
}
}