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"""
PRIVATE MODULE: do not import (from) it directly.
This module contains implementations of common functionality that can be used
throughout `jsons`.
"""
import builtins
import warnings
from importlib import import_module
from typing import Callable, Optional, Tuple, TypeVar, Any
from jsons._cache import cached
from jsons._compatibility_impl import get_union_params
from jsons.exceptions import UnknownClassError
NoneType = type(None)
JSON_KEYS = (str, int, float, bool, NoneType)
VALID_TYPES = (str, int, float, bool, list, tuple, set, dict, NoneType)
META_ATTR = '-meta' # The name of the attribute holding meta info.
T = TypeVar('T')
class StateHolder:
"""
This class holds the registered serializers and deserializers.
"""
_fork_counter = 0
_classes_serializers = list()
_classes_deserializers = list()
_serializers = dict()
_deserializers = dict()
_validators = dict()
_classes_validators = list()
_announced_classes = dict()
_suppress_warnings = False
_suppressed_warnings = set()
@classmethod
def _warn(cls, msg, code, *args, **kwargs):
if not cls._suppress_warnings and code not in cls._suppressed_warnings:
msg_ = ('{} Use suppress_warning({}) or suppress_warnings(True) to '
'turn off this message.'.format(msg, code))
warnings.warn(msg_, *args, **kwargs)
@cached
def get_class_name(cls: type,
transformer: Optional[Callable[[str], str]] = None,
fully_qualified: bool = False) -> Optional[str]:
"""
Return the name of a class.
:param cls: the class of which the name if to be returned.
:param transformer: any string transformer, e.g. ``str.lower``.
:param fully_qualified: if ``True`` return the fully qualified name (i.e.
complete with module name).
:return: the name of ``cls``, transformed if a transformer is given.
"""
transformer = transformer or (lambda x: x)
cls_name = _get_special_cases(cls)
if cls_name:
return transformer(cls_name)
cls_name = _get_simple_name(cls)
if fully_qualified:
module = _get_module(cls)
if module:
cls_name = '{}.{}'.format(module, cls_name)
cls_name = transformer(cls_name)
return cls_name
def _get_special_cases(cls: type):
if (hasattr(cls, '__qualname__')
and cls.__qualname__ == 'NewType.<locals>.new_type'):
return cls.__name__
def get_cls_from_str(cls_str: str, source: object, fork_inst) -> type:
cls = getattr(builtins, cls_str, None)
if cls:
return cls
if '[' in cls_str and ']' in cls_str:
return _get_generic_cls_from_str(cls_str, source, fork_inst)
try:
splitted = cls_str.split('.')
module_name = '.'.join(splitted[:-1])
cls_name = splitted[-1]
cls_module = import_module(module_name)
cls = getattr(cls_module, cls_name)
except (ImportError, AttributeError, ValueError):
cls = _lookup_announced_class(cls_str, source, fork_inst)
return cls
def _get_generic_cls_from_str(cls_str: str, source: object, fork_inst) -> type:
# If cls_str represents a generic type, try to parse the sub types.
origin_str, subtypes_str = cls_str.split('[')
subtypes_str = subtypes_str[0:-1] # Remove the ']'.
origin = get_cls_from_str(origin_str, source, fork_inst)
subtypes = [get_cls_from_str(s.strip(), source, fork_inst)
for s in subtypes_str.split(',')]
return origin[tuple(subtypes)]
def determine_precedence(
cls: type,
cls_from_meta: type,
cls_from_type: type,
inferred_cls: bool):
order = [cls, cls_from_meta, cls_from_type]
if inferred_cls:
# The type from a verbose dumped object takes precedence over an
# inferred type (e.g. T in List[T]).
order = [cls_from_meta, cls, cls_from_type]
# Now to return the first element in the order that holds a value.
for elem in order:
if elem:
return elem
def get_cls_and_meta(
json_obj: object,
fork_inst: type) -> Tuple[Optional[type], Optional[dict]]:
if isinstance(json_obj, dict) and META_ATTR in json_obj:
cls_str = json_obj[META_ATTR]['classes']['/']
cls = get_cls_from_str(cls_str, json_obj, fork_inst)
return cls, json_obj[META_ATTR]
return None, None
def can_match_with_none(cls: type):
# Return True if cls allows None; None is a valid value with the given cls.
result = cls in (Any, object, None, NoneType)
if not result:
cls_name = get_class_name(cls).lower()
result = (('union' in cls_name or 'optional' in cls_name)
and NoneType in get_union_params(cls))
return result
def _lookup_announced_class(
cls_str: str,
source: object,
fork_inst: type) -> type:
cls = fork_inst._announced_classes.get(cls_str)
if not cls:
msg = ('Could not find a suitable type for "{}". Make sure it can be '
'imported or that is has been announced.'.format(cls_str))
raise UnknownClassError(msg, source, cls_str)
return cls
def _get_simple_name(cls: type) -> str:
if cls is None:
cls = type(cls)
cls_name = getattr(cls, '__name__', None)
if not cls_name:
cls_name = getattr(cls, '_name', None)
if not cls_name:
cls_name = repr(cls)
cls_name = cls_name.split('[')[0] # Remove generic types.
cls_name = cls_name.split('.')[-1] # Remove any . caused by repr.
cls_name = cls_name.split(r"'>")[0] # Remove any '>.
return cls_name
def _get_module(cls: type) -> Optional[str]:
builtin_module = str.__class__.__module__
module = getattr(cls, '__module__', None)
if module and module != builtin_module:
return module