class Rufo::Formatter

def visit_array_pattern(node)
  # [:aryptn, const_ref, pre_rest, rest, post_rest]
  _, const_ref, pre_rest, rest, post_rest = node
  if const_ref
    return visit_constant_pattern(node)
  end
  # pattern is [*]
  if !pre_rest && !post_rest && rest == [:var_field, nil]
    consume_token :on_lbracket
    skip_space_or_newline
    consume_op "*"
    skip_space_or_newline
    consume_token :on_rbracket
    return
  end
  token_column = current_token_column
  has_bracket = current_token_kind == :on_lbracket
  if has_bracket
    consume_token :on_lbracket
    skip_space
  end
  write_comma = false
  if pre_rest
    visit_literal_elements pre_rest, inside_array: true, token_column: token_column, keep_final_newline: !has_bracket
    write_comma = true
  end
  # pattern like `[a,]` will make `rest` as `[:var_field, nil]`
  if rest && ((var_name_node = rest[1]) || current_token_value == "*")
    if write_comma
      write ","
      consume_space
    else
      skip_space_or_newline
    end
    consume_op "*"
    if var_name_node
      visit rest
    end
  end
  if post_rest
    skip_space
    check :on_comma
    write ","
    consume_space
    next_token
    visit_literal_elements post_rest, inside_array: true, token_column: token_column, keep_final_newline: !has_bracket
  end
  skip_space
  if has_bracket
    consume_token :on_rbracket
  end
end