def auto_converter(tt):
'''Auto convert attempt a number of ways of finding appropriate converters
to a unhandled type.
The first strategy is to check if the type is supported in the
mod:`pyson.jsonfy_extras` module.
If that is not the case, it searches for converters for the superclasses
of `tt`.
Finally, if that fails an error is raised.
'''
# Tries to import a converter from jsonfy_ext.* modules
name = type2name(tt)
try:
load_modules('pyson.jsonfy_extras.ext_' + name)
except AttributeError:
pass
try:
return CONVERTERS[tt]
except KeyError:
pass
# Tries to use a converter for a base class (hint: this often fails!)
for base_t in tt.mro()[:-1]:
try:
return CONVERTERS[base_t]
except KeyError:
pass
else:
raise TypeError('object of type %s is not supported' % tt)
def not_supported(obj):
raise TypeError('object of type %s is not supported' % tt)
return not_supported
def unjsonfy(json, tt=None, recursive=True, inplace=False, lazy=True):
"""Create object from its JSON representation
Parameters
----------
json : JSON-like
JSON-like structure to be converted to a Python object.
tt (optional): type
Type of the output object (can be inferred from the '@type' key, if
``json`` has it.
recursive : bool
If False, prevents recursive application of func:`jsonfy` to child nodes
of the JSON input.
"""
if tt is None:
try:
tt = json[u"@type"]
except:
if not lazy:
raise ValueError("'tt' must be set explicity if 'json' does not have a '@type' key")
else:
tt = None
else:
tt = name2type(tt)
# TODO: move 'inplace' and 'recursive' to the converter function
if not inplace:
json = deepcopy(json)
if recursive:
if isinstance(json, dict):
for k, v in json.items():
json[k] = unjsonfy(v, recursive=True, inplace=True)
elif isinstance(json, list):
for idx, v in enumerate(json):
json[idx] = unjsonfy(v, recursive=True, inplace=True)
# Compute the result from the converter function
try:
converter = CONVERTERS[tt]
except KeyError:
# Tries to load converters from unjsonfy_extras
try:
load_modules("pyson.unjsonfy_extras.ext_" + type2name(tt))
except AttributeError:
pass
try:
converter = CONVERTERS[tt]
except KeyError:
if tt is None:
return json
raise ValueError("there is no known converter to type %s" % tt)
return converter(json)
def unjsonfy(json, tt=None, recursive=True, inplace=False, lazy=True):
'''Create object from its JSON representation
Parameters
----------
json : JSON-like
JSON-like structure to be converted to a Python object.
tt (optional): type
Type of the output object (can be inferred from the '@type' key, if
``json`` has it.
recursive : bool
If False, prevents recursive application of func:`jsonfy` to child nodes
of the JSON input.
'''
if tt is None:
try:
tt = json[u'@type']
except:
if not lazy:
raise ValueError("'tt' must be set explicity if 'json' does not have a '@type' key")
else:
tt = None
else:
tt = name2type(tt)
#TODO: move 'inplace' and 'recursive' to the converter function
if not inplace:
json = deepcopy(json)
if recursive:
if isinstance(json, dict):
for k, v in json.items():
json[k] = unjsonfy(v, recursive=True, inplace=True)
elif isinstance(json, list):
for idx, v in enumerate(json):
json[idx] = unjsonfy(v, recursive=True, inplace=True)
# Compute the result from the converter function
try:
converter = CONVERTERS[tt]
except KeyError:
# Tries to load converters from unjsonfy_extras
try: load_modules('pyson.unjsonfy_extras.ext_' + type2name(tt))
except AttributeError: pass
try:
converter = CONVERTERS[tt]
except KeyError:
if tt is None:
return json
raise ValueError('there is no known converter to type %s' % tt)
return converter(json)
def auto_converter(tt):
'''Auto convert attempt a number of ways of finding appropriate converters
to a unhandled type.
The first strategy is to check if the type is supported in the
mod:`pyson.jsonfy_extras` module.
If that is not the case, it searches for converters for the superclasses
of `tt`.
Finally, if that fails an error is raised.
'''
# Tries to import a converter from jsonfy_ext.* modules
name = type2name(tt)
try:
load_modules('pyson.jsonfy_extras.ext_' + name)
except AttributeError:
pass
try:
return CONVERTERS[tt]
except KeyError:
pass
# Tries to use a converter for a base class (hint: this often fails!)
for base_t in tt.mro()[:-1]:
try:
return CONVERTERS[base_t]
except KeyError:
pass
else:
raise TypeError('object of type %s is not supported' % tt)
def not_supported(obj):
raise TypeError('object of type %s is not supported' % tt)
return not_supported
