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�Zd�Zd�Zd�Zd�Zdefd��YZ dS(s�JSON (de)serialization framework.

The framework presented here is somewhat based on `Go's "json" package`_
(especially the ``omitempty`` functionality).

.. _`Go's "json" package`: http://golang.org/pkg/encoding/json/

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    :class:`Field` is meant to be used together with
    :class:`JSONObjectWithFields`.

    ``encoder`` (``decoder``) is a callable that accepts a single
    parameter, i.e. a value to be encoded (decoded), and returns the
    serialized (deserialized) value. In case of errors it should raise
    :class:`~josepy.errors.SerializationError`
    (:class:`~josepy.errors.DeserializationError`).

    Note, that ``decoder`` should perform partial serialization only.

    :ivar str json_name: Name of the field when encoded to JSON.
    :ivar default: Default value (used when not present in JSON object).
    :ivar bool omitempty: If ``True`` and the field value is empty, then
        it will not be included in the serialized JSON object, and
        ``default`` will be used for deserialization. Otherwise, if ``False``,
        field is considered as required, value will always be included in the
        serialized JSON objected, and it must also be present when
        deserializing.

    t	json_nametdefaultt	omitemptytfdectfenccCs[||_||_||_|dkr0|jn||_|dkrN|jn||_dS(N(RRRtNonetdefault_decoderRtdefault_encoderR	(tselfRRRtdecodertencoder((s4/usr/lib/python2.7/site-packages/josepy/json_util.pyt__init__/s
			cCst|t�o|S(s�Is the provided value considered "empty" for this field?

        This is useful for subclasses that might want to override the
        definition of being empty, e.g. for some more exotic data types.

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cCs|jd|�S(s6Descriptor to change the decoder on JSON object field.R(R(R
R((s4/usr/lib/python2.7/site-packages/josepy/json_util.pyRNscCs|jd|�S(s6Descriptor to change the encoder on JSON object field.R(R(R
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|j|�S(s4Decode a value, optionally with context JSON object.(R(R
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        Recursively deserialize into immutable types (
        :class:`josepy.util.frozendict` instead of
        :func:`dict`, :func:`tuple` instead of :func:`list`).

        c3s|]}�j|�VqdS(N(R(t.0tsubvalue(R(s4/usr/lib/python2.7/site-packages/josepy/json_util.pys	<genexpr>isc3s3|])\}}�j|��j|�fVqdS(N(R(RtkeyR(R(s4/usr/lib/python2.7/site-packages/josepy/json_util.pys	<genexpr>lsN(RtlistttupleRRt
frozendicttsixt	iteritems(RR((Rs4/usr/lib/python2.7/site-packages/josepy/json_util.pyR^s
cCs|S(sDefault (passthrough) encoder.((RR((s4/usr/lib/python2.7/site-packages/josepy/json_util.pyRqs(s	json_namesdefaults	omitemptysfdecsfencN(t__name__t
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						tJSONObjectWithFieldsMetacBseZdZd�ZRS(s�Metaclass for :class:`JSONObjectWithFields` and its subclasses.

    It makes sure that, for any class ``cls`` with ``__metaclass__``
    set to ``JSONObjectWithFieldsMeta``:

    1. All fields (attributes of type :class:`Field`) in the class
       definition are moved to the ``cls._fields`` dictionary, where
       keys are field attribute names and values are fields themselves.

    2. ``cls.__slots__`` is extended by all field attribute names
       (i.e. not :attr:`Field.json_name`). Original ``cls.__slots__``
       are stored in ``cls._orig_slots``.

    In a consequence, for a field attribute name ``some_field``,
    ``cls.some_field`` will be a slot descriptor and not an instance
    of :class:`Field`. For example::

      some_field = Field('someField', default=())

      class Foo(object):
          __metaclass__ = JSONObjectWithFieldsMeta
          __slots__ = ('baz',)
          some_field = some_field

      assert Foo.__slots__ == ('some_field', 'baz')
      assert Foo._orig_slots == ()
      assert Foo.some_field is not Field

      assert Foo._fields.keys() == ['some_field']
      assert Foo._fields['some_field'] is some_field

    As an implementation note, this metaclass inherits from
    :class:`abc.ABCMeta` (and not the usual :class:`type`) to mitigate
    the metaclass conflict (:class:`ImmutableMap` and
    :class:`JSONDeSerializable`, parents of :class:`JSONObjectWithFields`,
    use :class:`abc.ABCMeta` as its metaclass).

    cCs�i}x'|D]}|jt|di��q
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    Example::

      class Foo(JSONObjectWithFields):
          bar = Field('Bar')
          empty = Field('Empty', omitempty=True)

          @bar.encoder
          def bar(value):
              return value + 'bar'

          @bar.decoder
          def bar(value):
              if not value.endswith('bar'):
                  raise errors.DeserializationError('No bar suffix!')
              return value[:-3]

      assert Foo(bar='baz').to_partial_json() == {'Bar': 'bazbar'}
      assert Foo.from_json({'Bar': 'bazbar'}) == Foo(bar='baz')
      assert (Foo.from_json({'Bar': 'bazbar', 'Empty': '!'})
              == Foo(bar='baz', empty='!'))
      assert Foo(bar='baz').bar == 'baz'

    cCs8tgtj|j�D]\}}||jf^q�S(sGet default fields values.(RR%R&R.R(Rtslottfield((s4/usr/lib/python2.7/site-packages/josepy/json_util.pyt	_defaults�scKs)tt|�jt|j�|��dS(N(tsuperR=RRR@(R
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        :param str name: Name of the field to be encoded.

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    :param bytes data:
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    :rtype: bytes

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        :rtype: dict

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