class Protobuf::Node::ExtensionRangeNode

def initialize(low, high=nil)
  @low, @high = low, high
end

def to_s
  if @high.nil?
    @low.to_s
  elsif @high == :max
    "#{@low}..::Protobuf::Extend::MAX"
  else
    "#{@low}..#{@high}"
  end
end