How to use the capirca.lib.policy_simple.Field function in capirca

def ValueStr(self):
    return self.value


class IntegerField(Field):

  def __init__(self, value):
    super(IntegerField, self).__init__(value)
    try:
      _ = int(value)
    except ValueError:
      raise ValueError('Invalid integer field: "%s"' % str(self))


class NamingField(Field):
  """A naming field is one that refers to names in used in naming.py."""

  def __init__(self, value):
    super(NamingField, self).__init__(value)
    self.value = self.ParseString(value)

  def ParseString(self, value):
    """Split and validate a string value into individual names."""
    parts = set(value.split())
    for p in parts:
      self.ValidatePart(p)
    return parts

  def ValidatePart(self, part):
    """Validate that a string smells like a naming.py name."""
    for c in part:

"""A destination-exclude field."""


class DestinationInterface(Field):
  """A destination-interface field."""


class DestinationPort(Port):
  """A destination-port field."""


class DestinationPrefix(Field):
  """A destination-prefix field."""


class DestinationPrefixExcept(Field):
  """A destination-prefix-except field."""


class DestinationTag(Field):
  """A destination tag field."""


class DscpMatch(Field):
  """A dscp-match field."""


class DscpSet(Field):
  """A dscp-set field."""


class EtherType(Field):

"""A source-prefix-except field."""


class SourceTag(Field):
  """A source tag field."""


class Target(Field):
  """A target field."""


class Timeout(IntegerField):
  """A timeout field."""


class TrafficType(Field):
  """A traffic-type field."""


class TrafficClassCount(Field):
  """A traffic-class-count field."""


class Verbatim(Field):
  """A verbatim field."""


class Vpn(Field):
  """A vpn field."""


destination_address_fields = (DestinationAddress, DestinationExclude,

"""An expiration field."""


class FragmentOffset(Field):
  """A fragment-offset field."""


class ForwardingClass(Field):
  """A forwarding-class field."""


class ForwardingClassExcept(Field):
  """A forwarding-class-except field."""


class IcmpCode(Field):
  """A icmp-code field."""


class IcmpType(Field):
  """A icmp-type field."""


class Logging(Field):
  """A logging field."""


class LossPriority(Field):
  """A loss-priority field."""


class Option(Field):

"""A logging field."""


class LossPriority(Field):
  """A loss-priority field."""


class Option(Field):
  """An Option field."""


class Owner(Field):
  """An owner field."""


class NextIP(Field):
  """An owner field."""


class PacketLength(Field):
  """A packet-length field."""


class Platform(Field):
  """A platform field."""


class PlatformExclude(Field):
  """A platform-exclude field."""


class Policer(Field):

return ' ' + '\n'.join(value_buf)


class Action(Field):
  """An action field."""


class Address(NamingField):
  """An address field."""


class Port(NamingField):
  """A port field."""


class Comment(Field):
  """A comment field."""

  def ValueStr(self):
    # Comments should align with the string contents, after the leading
    # quotation mark.
    return self.value.replace('\n', '\n ')


class Counter(Field):
  """A counter field."""


class DestinationAddress(Address):
  """A destination-address field."""

"""An ether-type field."""


class Expiration(Field):
  """An expiration field."""


class FragmentOffset(Field):
  """A fragment-offset field."""


class ForwardingClass(Field):
  """A forwarding-class field."""


class ForwardingClassExcept(Field):
  """A forwarding-class-except field."""


class IcmpCode(Field):
  """A icmp-code field."""


class IcmpType(Field):
  """A icmp-type field."""


class Logging(Field):
  """A logging field."""


class LossPriority(Field):

"""A packet-length field."""


class Platform(Field):
  """A platform field."""


class PlatformExclude(Field):
  """A platform-exclude field."""


class Policer(Field):
  """A rate-limit-icmp field."""


class Precedence(Field):
  """A precedence field."""


class Protocol(Field):
  """A Protocol field."""


class ProtocolExcept(Field):
  """A protocol-except field."""


class Qos(Field):
  """A rate-limit-icmp field."""


class PANApplication(Field):

"""A icmp-code field."""


class IcmpType(Field):
  """A icmp-type field."""


class Logging(Field):
  """A logging field."""


class LossPriority(Field):
  """A loss-priority field."""


class Option(Field):
  """An Option field."""


class Owner(Field):
  """An owner field."""


class NextIP(Field):
  """An owner field."""


class PacketLength(Field):
  """A packet-length field."""


class Platform(Field):

"""A rate-limit-icmp field."""


class RoutingInstance(Field):
  """A routing-instance field."""


class SourceAddress(Address):
  """A source-address field."""


class SourceExclude(Address):
  """A source-exclude field."""


class SourceInterface(Field):
  """A source-interface field."""


class SourcePort(Port):
  """A source-port field."""


class SourcePrefix(Field):
  """A source-prefix field."""


class SourcePrefixExcept(Field):
  """A source-prefix-except field."""


class SourceTag(Field):