class Rufo::Formatter

def visit_unary(node)
  # [:unary, :-@, [:vcall, [:@ident, "x", [1, 2]]]]
  _, op, exp = node
  consume_op_or_keyword op
  setting = op == :not ? @spaces_in_commands : @spaces_around_unary
  first_space = space?
  consume_space = first_space && setting == :dynamic
  if consume_space
    consume_space(want_preserve_whitespace: true)
  else
    skip_space_or_newline
  end
  if op == :not
    has_paren = current_token_kind == :on_lparen
    if has_paren && !first_space
      write "("
      next_token
      skip_space_or_newline
    elsif !has_paren && !consume_space
      write_space
    end
    visit exp
    if has_paren && !first_space
      skip_space_or_newline
      check :on_rparen
      write ")"
      next_token
    end
  else
    visit exp
  end
end