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jsons
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..
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__init__.py
(11.57 KB)
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__pycache__
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_cache.py
(1.23 KB)
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_common_impl.py
(5.89 KB)
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_compatibility_impl.py
(3.06 KB)
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_datetime_impl.py
(4.98 KB)
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_dump_impl.py
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_extra_impl.py
(1.7 KB)
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_fork_impl.py
(1.39 KB)
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_key_transformers.py
(1.32 KB)
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_lizers_impl.py
(5.73 KB)
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_load_impl.py
(8.16 KB)
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_multitasking.py
(2.34 KB)
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_package_info.py
(376 B)
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_transform_impl.py
(1.48 KB)
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_validation.py
(2.64 KB)
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classes
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decorators.py
(6.62 KB)
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deserializers
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exceptions.py
(6.02 KB)
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serializers
Editing: _common_impl.py
""" 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
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