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.CondaPkg/env/lib/python3.11/site-packages/jsons/_common_impl.py

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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