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import datetime
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import functools
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import decimal
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import imp
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__all__ = ['json', 'simplejson', 'stdlibjson']
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def _is_aware(value):
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"""
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Determines if a given datetime.time is aware.
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The logic is described in Python's docs:
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http://docs.python.org/library/datetime.html#datetime.tzinfo
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"""
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return (value.tzinfo is not None
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and value.tzinfo.utcoffset(value) is not None)
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def _obj_dump(obj):
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"""
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Custom function for dumping objects to JSON, if obj has __json__ attribute
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or method defined it will be used for serialization
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:param obj:
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"""
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if isinstance(obj, complex):
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return [obj.real, obj.imag]
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# See "Date Time String Format" in the ECMA-262 specification.
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# some code borrowed from django 1.4
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elif isinstance(obj, datetime.datetime):
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r = obj.isoformat()
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if obj.microsecond:
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r = r[:23] + r[26:]
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if r.endswith('+00:00'):
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r = r[:-6] + 'Z'
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return r
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elif isinstance(obj, datetime.date):
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return obj.isoformat()
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elif isinstance(obj, decimal.Decimal):
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return str(obj)
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elif isinstance(obj, datetime.time):
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if _is_aware(obj):
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raise ValueError("JSON can't represent timezone-aware times.")
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r = obj.isoformat()
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if obj.microsecond:
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r = r[:12]
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return r
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elif isinstance(obj, set):
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return list(obj)
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elif hasattr(obj, '__json__'):
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if callable(obj.__json__):
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return obj.__json__()
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else:
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return obj.__json__
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else:
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raise NotImplementedError
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# Import simplejson
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try:
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# import simplejson initially
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_sj = imp.load_module('_sj', *imp.find_module('simplejson'))
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def extended_encode(obj):
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try:
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return _obj_dump(obj)
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except NotImplementedError:
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pass
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raise TypeError("%r is not JSON serializable" % (obj,))
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# we handle decimals our own it makes unified behavior of json vs
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# simplejson
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sj_version = [int(x) for x in _sj.__version__.split('.')]
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major, minor = sj_version[0], sj_version[1]
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if major < 2 or (major == 2 and minor < 1):
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# simplejson < 2.1 doesnt support use_decimal
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_sj.dumps = functools.partial(_sj.dumps,
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default=extended_encode)
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_sj.dump = functools.partial(_sj.dump,
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default=extended_encode)
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else:
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_sj.dumps = functools.partial(_sj.dumps,
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default=extended_encode,
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use_decimal=False)
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_sj.dump = functools.partial(_sj.dump,
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default=extended_encode,
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use_decimal=False)
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simplejson = _sj
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except ImportError:
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# no simplejson set it to None
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simplejson = None
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try:
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# simplejson not found try out regular json module
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_json = imp.load_module('_json', *imp.find_module('json'))
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# extended JSON encoder for json
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class ExtendedEncoder(_json.JSONEncoder):
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def default(self, obj):
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try:
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return _obj_dump(obj)
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except NotImplementedError:
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pass
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raise TypeError("%r is not JSON serializable" % (obj,))
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# monkey-patch JSON encoder to use extended version
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_json.dumps = functools.partial(_json.dumps, cls=ExtendedEncoder)
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_json.dump = functools.partial(_json.dump, cls=ExtendedEncoder)
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stdlibjson = _json
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except ImportError:
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stdlibjson = None
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# set all available json modules
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if simplejson:
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json = _sj
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elif stdlibjson:
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json = _json
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else:
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raise ImportError('Could not find any json modules')
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