class Racc::ParserFileGenerator

def parser_class(classname, superclass)
  mods = classname.split('::')
  classid = mods.pop
  mods.each do |mod|
    indent; line "module #{mod}"
    cref_push mod
  end
  indent; line "class #{classid} < #{superclass}"
  cref_push classid
  yield
  cref_pop
  indent; line "end   \# class #{classid}"
  mods.reverse_each do |mod|
    cref_pop
    indent; line "end   \# module #{mod}"
  end
end