mirror of
https://github.com/django/django.git
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92c35a0617
to return Decimal instances in Python for this field. Backwards incompatible change. Added a real FloatField (stores floats in the database) and support for FloatField and DecimalField in newforms (analogous to IntegerField). Included decimal.py module (as django.utils._decimal) from Python 2.4. This is license compatible with Django and included for Python 2.3 compatibility only. Large portions of this work are based on patches from Andy Durdin and Jorge Gajon. git-svn-id: http://code.djangoproject.com/svn/django/trunk@5302 bcc190cf-cafb-0310-a4f2-bffc1f526a37
87 lines
2.8 KiB
Python
87 lines
2.8 KiB
Python
"""
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Serialize data to/from JSON
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"""
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import datetime
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from django.utils import simplejson
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from django.utils.simplejson import decoder
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from django.core.serializers.python import Serializer as PythonSerializer
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from django.core.serializers.python import Deserializer as PythonDeserializer
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try:
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from cStringIO import StringIO
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except ImportError:
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from StringIO import StringIO
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try:
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import decimal
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except ImportError:
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from django.utils import _decimal as decimal # Python 2.3 fallback
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class Serializer(PythonSerializer):
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"""
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Convert a queryset to JSON.
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"""
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def end_serialization(self):
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simplejson.dump(self.objects, self.stream, cls=DjangoJSONEncoder, **self.options)
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def getvalue(self):
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if callable(getattr(self.stream, 'getvalue', None)):
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return self.stream.getvalue()
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def Deserializer(stream_or_string, **options):
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"""
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Deserialize a stream or string of JSON data.
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"""
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if isinstance(stream_or_string, basestring):
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stream = StringIO(stream_or_string)
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else:
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stream = stream_or_string
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#for obj in PythonDeserializer(simplejson.load(stream, cls=DjangoJSONDecoder)):
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for obj in PythonDeserializer(simplejson.load(stream)):
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yield obj
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class DjangoJSONEncoder(simplejson.JSONEncoder):
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"""
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JSONEncoder subclass that knows how to encode date/time and decimal types.
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"""
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DATE_FORMAT = "%Y-%m-%d"
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TIME_FORMAT = "%H:%M:%S"
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def default(self, o):
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if isinstance(o, datetime.datetime):
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return o.strftime("%s %s" % (self.DATE_FORMAT, self.TIME_FORMAT))
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elif isinstance(o, datetime.date):
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return o.strftime(self.DATE_FORMAT)
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elif isinstance(o, datetime.time):
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return o.strftime(self.TIME_FORMAT)
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elif isinstance(o, decimal.Decimal):
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return str(o)
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else:
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return super(DjangoJSONEncoder, self).default(o)
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# Older, deprecated class name (for backwards compatibility purposes).
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DateTimeAwareJSONEncoder = DjangoJSONEncoder
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## Our override for simplejson.JSONNumber, because we want to use decimals in
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## preference to floats (we can convert decimal -> float when they stored, if
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## needed, but cannot go the other way).
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#def DjangoNumber(match, context):
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# match = DjangoNumber.regex.match(match.string, *match.span())
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# integer, frac, exp = match.groups()
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# if exp:
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# res = float(integer + (frac or '') + (exp or ''))
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# elif frac:
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# res = decimal.Decimal(integer + frac)
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# else:
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# res = int(integer)
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# return res, None
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#decoder.pattern(r'(-?(?:0|[1-9]\d*))(\.\d+)?([eE][-+]?\d+)?')(DjangoNumber)
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#
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#converters = decoder.ANYTHING[:]
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#converters[-1] = DjangoNumber
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#decoder.JSONScanner = decoder.Scanner(converters)
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#
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#class DjangoJSONDecoder(simplejson.JSONDecoder):
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# _scanner = decoder.Scanner(converters)
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#
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