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from collections.abc import Callable, Sequence
from types import new_class
from typing import Any, Type, Union, cast
from typing_extensions import Literal
from mashumaro.core.const import Sentinel
from mashumaro.types import SerializationStrategy
__all__ = ["Dialect"]
SerializationStrategyValueType = Union[
SerializationStrategy, dict[str, Union[str, Callable]]
]
class Dialect:
serialization_strategy: dict[Any, SerializationStrategyValueType] = {}
serialize_by_alias: Union[bool, Literal[Sentinel.MISSING]] = (
Sentinel.MISSING
)
namedtuple_as_dict: Union[bool, Literal[Sentinel.MISSING]] = (
Sentinel.MISSING
)
omit_none: Union[bool, Literal[Sentinel.MISSING]] = Sentinel.MISSING
omit_default: Union[bool, Literal[Sentinel.MISSING]] = Sentinel.MISSING
no_copy_collections: Union[Sequence[Any], Literal[Sentinel.MISSING]] = (
Sentinel.MISSING
)
@classmethod
def merge(cls, other: Type["Dialect"]) -> Type["Dialect"]:
serialization_strategy: dict[Any, SerializationStrategyValueType] = {}
for key, value in cls.serialization_strategy.items():
if isinstance(value, SerializationStrategy):
serialization_strategy[key] = value
else:
serialization_strategy[key] = value.copy()
for key, value in other.serialization_strategy.items():
if isinstance(value, SerializationStrategy):
serialization_strategy[key] = value
elif isinstance(
serialization_strategy.get(key), SerializationStrategy
):
serialization_strategy[key] = value
else:
(
serialization_strategy.setdefault(
key, {}
).update( # type: ignore
value
)
)
new_dialect = cast(Type[Dialect], new_class("Dialect", (Dialect,)))
new_dialect.serialization_strategy = serialization_strategy
for key in ("omit_none", "omit_default", "no_copy_collections"):
if (others_value := getattr(other, key)) is not Sentinel.MISSING:
setattr(new_dialect, key, others_value)
else:
setattr(new_dialect, key, getattr(cls, key))
return new_dialect
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