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"""
Helper classes for parsers.
"""
from __future__ import unicode_literals
from django.db.models.query import QuerySet
from django.utils import six, timezone
from django.utils.encoding import force_text
from django.utils.functional import Promise
from rest_framework.compat import total_seconds
import datetime
import decimal
import json
import uuid
class JSONEncoder(json.JSONEncoder):
"""
JSONEncoder subclass that knows how to encode date/time/timedelta,
decimal types, generators and other basic python objects.
"""
def default(self, obj):
# For Date Time string spec, see ECMA 262
# http://ecma-international.org/ecma-262/5.1/#sec-15.9.1.15
if isinstance(obj, Promise):
return force_text(obj)
elif isinstance(obj, datetime.datetime):
representation = obj.isoformat()
if obj.microsecond:
representation = representation[:23] + representation[26:]
if representation.endswith('+00:00'):
representation = representation[:-6] + 'Z'
return representation
elif isinstance(obj, datetime.date):
return obj.isoformat()
elif isinstance(obj, datetime.time):
if timezone and timezone.is_aware(obj):
raise ValueError("JSON can't represent timezone-aware times.")
representation = obj.isoformat()
if obj.microsecond:
representation = representation[:12]
return representation
elif isinstance(obj, datetime.timedelta):
return six.text_type(total_seconds(obj))
elif isinstance(obj, decimal.Decimal):
# Serializers will coerce decimals to strings by default.
return float(obj)
elif isinstance(obj, uuid.UUID):
return six.text_type(obj)
elif isinstance(obj, QuerySet):
return tuple(obj)
elif hasattr(obj, 'tolist'):
# Numpy arrays and array scalars.
return obj.tolist()
elif hasattr(obj, '__getitem__'):
try:
return dict(obj)
except:
pass
elif hasattr(obj, '__iter__'):
return tuple(item for item in obj)
return super(JSONEncoder, self).default(obj)
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