56 lines
1.5 KiB
Python
56 lines
1.5 KiB
Python
"""Utilities for diot"""
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from typing import TYPE_CHECKING, Any, Iterable
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if TYPE_CHECKING:
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from .diot import Diot
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class DiotFrozenError(Exception):
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"""When try to modify a frozen diot"""
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def nest(
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value: Any,
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types: Iterable[type],
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dest_type: type,
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frozen: bool,
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) -> Any:
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"""Convert values with certain types recursively"""
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# nothing to convert
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if not types or not isinstance(value, tuple(types)): # type: ignore
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return value
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if (list in types and isinstance(value, list)) or ( # type: ignore
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tuple in types and isinstance(value, tuple) # type: ignore
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):
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# use value.__class__ to keep user-subclassed list or tuple
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out = [nest(val, types, dest_type, frozen) for val in value]
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try:
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return value.__class__(out)
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except Exception: # pragma: no cover
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return out
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if dict in types and isinstance(value, dict): # type: ignore
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if issubclass(value.__class__, dest_type):
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return value
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return dest_type(
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[
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(key, nest(val, types, dest_type, frozen))
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for key, val in value.items()
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]
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)
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return value
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def to_dict(value: "Diot") -> dict:
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"""Convert converted Diot objects back to dict"""
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if isinstance(value, dict):
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return {key: to_dict(val) for key, val in value.items()}
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if isinstance(value, tuple):
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return tuple((to_dict(val) for val in value))
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if isinstance(value, list):
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return [to_dict(val) for val in value]
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return value
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