class Protobuf::Generators::FileGenerator

def print_package(&block)
  namespaces = descriptor.package.split('.')
  if namespaces.empty? && ENV.key?('PB_ALLOW_DEFAULT_PACKAGE_NAME')
    namespaces = [File.basename(descriptor.name).sub('.proto', '')]
  end
  namespaces.reverse.reduce(block) do |previous, namespace|
    -> { print_module(namespace, &previous) }
  end.call
end