class RuboCop::Cop::Style::NestedModifier

def right_hand_operand(node, left_hand_keyword)
  condition = node.condition
  expr = if condition.send_type? && !condition.arguments.empty? &&
            !condition.operator_method?
           add_parentheses_to_method_arguments(condition)
         else
           condition.source
         end
  expr = "(#{expr})" if requires_parens?(condition)
  expr = "!#{expr}" unless left_hand_keyword == node.keyword
  expr
end