module RuboCop::Cop::ClassishLength

def code_length(node)
  body_line_numbers = line_range(node).to_a[1...-1]
  target_line_numbers = body_line_numbers -
                        line_numbers_of_inner_thing(node, :module) -
                        line_numbers_of_inner_thing(node, :class)
  target_line_numbers.reduce(0) do |length, line_number|
    source_line = processed_source[line_number]
    next length if irrelevant_line(source_line)
    length + 1
  end
end

def line_numbers_of_inner_thing(node, type)
  line_numbers = Set.new
  node.each_descendant(:module, type) do |inner_node|
    line_range = line_range(inner_node)
    line_numbers.merge(line_range)
  end
  line_numbers.to_a
end