class RuboCop::Cop::Metrics::ClassLength

The maximum allowed length is configurable.
Comment lines can optionally be ignored.
This cop checks if the length a class exceeds some maximum value.

def message(length, max_length) 

def message(length, max_length)
  format('Class has too many lines. [%<length>d/%<max>d]',
         length: length,
         max: max_length)
end

def on_casgn(node) 

def on_casgn(node)
  class_definition?(node) do
    check_code_length(node)
  end
end

def on_class(node) 

def on_class(node)
  check_code_length(node)
end