class RuboCop::Cop::Style::NestedFileDirname


File.dirname(path, 2)
# good
File.dirname(File.dirname(path))
# bad
@example
It replaces nested ‘File.dirname` with the level argument introduced in Ruby 3.1.
Checks for nested `File.dirname`.

def offense_range(node) 

def offense_range(node)
  range_between(node.loc.selector.begin_pos, node.source_range.end_pos)
end

def on_send(node) 

def on_send(node)
  return if file_dirname?(node.parent) || !file_dirname?(node.first_argument)
  path, level = path_with_dir_level(node, 1)
  return if level < 2
  message = format(MSG, path: path, level: level)
  range = offense_range(node)
  add_offense(range, message: message) do |corrector|
    corrector.replace(range, "dirname(#{path}, #{level})")
  end
end

def path_with_dir_level(node, level) 

def path_with_dir_level(node, level)
  first_argument = node.first_argument
  if file_dirname?(first_argument)
    level += 1
    path_with_dir_level(first_argument, level)
  else
    [first_argument.source, level]
  end
end