class RuboCop::Cop::Style::NestedModifier

def add_parentheses_to_method_arguments(send_node)
  expr = +''
  expr << "#{send_node.receiver.source}." if send_node.receiver
  expr << send_node.method_name.to_s
  expr << "(#{send_node.arguments.map(&:source).join(', ')})"
  expr
end