95 lines
3.0 KiB
Python
95 lines
3.0 KiB
Python
"""Preconfigured converters for tomllib."""
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from base64 import b85decode, b85encode
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from collections.abc import Set
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from datetime import date, datetime
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from enum import Enum
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from operator import attrgetter
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from typing import Any, TypeVar, Union
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try:
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from tomllib import loads
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except ImportError:
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from tomli import loads
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try:
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from tomli_w import dumps
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except ImportError: # pragma: nocover
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dumps = None
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from .._compat import is_mapping, is_subclass
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from ..converters import BaseConverter, Converter
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from ..fns import identity
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from ..strategies import configure_union_passthrough
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from . import validate_datetime, wrap
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__all__ = ["TomllibConverter", "configure_converter", "make_converter"]
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T = TypeVar("T")
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_enum_value_getter = attrgetter("_value_")
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class TomllibConverter(Converter):
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"""A converter subclass specialized for tomllib."""
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if dumps is not None:
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def dumps(self, obj: Any, unstructure_as: Any = None, **kwargs: Any) -> str:
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return dumps(self.unstructure(obj, unstructure_as=unstructure_as), **kwargs)
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def loads(self, data: str, cl: type[T], **kwargs: Any) -> T:
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return self.structure(loads(data, **kwargs), cl)
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def configure_converter(converter: BaseConverter):
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"""
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Configure the converter for use with the tomllib library.
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* bytes are serialized as base85 strings
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* sets are serialized as lists
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* tuples are serializas as lists
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* mapping keys are coerced into strings when unstructuring
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* dates and datetimes are left for tomllib to handle
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"""
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converter.register_structure_hook(bytes, lambda v, _: b85decode(v))
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converter.register_unstructure_hook(
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bytes, lambda v: (b85encode(v) if v else b"").decode("utf8")
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)
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@converter.register_unstructure_hook_factory(is_mapping)
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def gen_unstructure_mapping(cl: Any, unstructure_to=None):
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key_handler = str
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args = getattr(cl, "__args__", None)
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if args:
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if is_subclass(args[0], str):
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key_handler = _enum_value_getter if is_subclass(args[0], Enum) else None
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elif is_subclass(args[0], bytes):
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def key_handler(k: bytes):
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return b85encode(k).decode("utf8")
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return converter.gen_unstructure_mapping(
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cl, unstructure_to=unstructure_to, key_handler=key_handler
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)
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converter.register_unstructure_hook(datetime, identity)
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converter.register_structure_hook(datetime, validate_datetime)
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converter.register_unstructure_hook(date, identity)
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converter.register_structure_hook(
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date, lambda v, _: v if isinstance(v, date) else date.fromisoformat(v)
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)
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configure_union_passthrough(Union[str, int, float, bool], converter)
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@wrap(TomllibConverter)
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def make_converter(*args: Any, **kwargs: Any) -> TomllibConverter:
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kwargs["unstruct_collection_overrides"] = {
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Set: list,
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tuple: list,
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**kwargs.get("unstruct_collection_overrides", {}),
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}
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res = TomllibConverter(*args, **kwargs)
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configure_converter(res)
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return res
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