class Protobuf::Field::FieldProxy

def initialize(message_class, rule, type, name, tag, options)
  @message_class, @rule, @type, @name, @tag, @options =
    message_class, rule, type, name, tag, options
end

def ready?
  false
end

def setup
  type = typename_to_class(@message_class, @type)
  field_class = \
    if type < Enum
      EnumField
    elsif type < Message
      MessageField
    else
      raise TypeError, type.inspect
    end
  field_class.new(@message_class, @rule, type, @name, @tag, @options)
end

def typename_to_class(message_class, type)
  names = type.to_s.split('::').map {|s| Util.camelize(s) }
  outer = message_class.to_s.split('::')
  args = (Object.method(:const_defined?).arity == 1) ? [] : [false]
  while
    mod = outer.empty? ? Object : eval(outer.join('::'))
    mod = names.inject(mod) {|m, s|
      m && m.const_defined?(s, *args) && m.const_get(s)
    }
    break if mod
    raise NameError.new("type not found: #{type}", type) if outer.empty?
    outer.pop
  end
  mod
end