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ext_json.py
106 lines | 3.0 KiB | text/x-python | PythonLexer
import datetime
import functools
import decimal
__all__ = ['json', 'simplejson', 'stdjson']
def _is_aware(value):
"""
Determines if a given datetime.time is aware.
The logic is described in Python's docs:
http://docs.python.org/library/datetime.html#datetime.tzinfo
"""
return (value.tzinfo is not None
and value.tzinfo.utcoffset(value) is not None)
def _obj_dump(obj):
"""
Custom function for dumping objects to JSON, if obj has __json__ attribute
or method defined it will be used for serialization
:param obj:
"""
if isinstance(obj, complex):
return [obj.real, obj.imag]
# See "Date Time String Format" in the ECMA-262 specification.
# some code borrowed from django 1.4
elif isinstance(obj, datetime.datetime):
r = obj.isoformat()
if obj.microsecond:
r = r[:23] + r[26:]
if r.endswith('+00:00'):
r = r[:-6] + 'Z'
return r
elif isinstance(obj, datetime.date):
return obj.isoformat()
elif isinstance(obj, decimal.Decimal):
return str(obj)
elif isinstance(obj, datetime.time):
if _is_aware(obj):
raise ValueError("JSON can't represent timezone-aware times.")
r = obj.isoformat()
if obj.microsecond:
r = r[:12]
return r
elif isinstance(obj, set):
return list(obj)
elif hasattr(obj, '__json__'):
if callable(obj.__json__):
return obj.__json__()
else:
return obj.__json__
else:
raise NotImplementedError
# Import simplejson
try:
# import simplejson initially
import simplejson as _sj
def extended_encode(obj):
try:
return _obj_dump(obj)
except NotImplementedError:
pass
raise TypeError("%r is not JSON serializable" % (obj,))
# we handle decimals our own it makes unified behavior of json vs
# simplejson
_sj.dumps = functools.partial(_sj.dumps, default=extended_encode,
use_decimal=False)
_sj.dump = functools.partial(_sj.dump, default=extended_encode,
use_decimal=False)
simplejson = _sj
except ImportError:
# no simplejson set it to None
_sj = None
try:
# simplejson not found try out regular json module
import json as _json
# extended JSON encoder for json
class ExtendedEncoder(_json.JSONEncoder):
def default(self, obj):
try:
return _obj_dump(obj)
except NotImplementedError:
pass
return _json.JSONEncoder.default(self, obj)
# monkey-patch JSON encoder to use extended version
_json.dumps = functools.partial(_json.dumps, cls=ExtendedEncoder)
_json.dump = functools.partial(_json.dump, cls=ExtendedEncoder)
stdlib = _json
except ImportError:
_json = None
# set all available json modules
simplejson = _sj
stdjson = _json
json = _sj if _sj else _json