18 lines
476 B
Python
18 lines
476 B
Python
"""Useful internal functions."""
|
|
from typing import NoReturn, Type, TypeVar
|
|
|
|
from .errors import StructureHandlerNotFoundError
|
|
|
|
T = TypeVar("T")
|
|
|
|
|
|
def identity(obj: T) -> T:
|
|
"""The identity function."""
|
|
return obj
|
|
|
|
|
|
def raise_error(_, cl: Type) -> NoReturn:
|
|
"""At the bottom of the condition stack, we explode if we can't handle it."""
|
|
msg = f"Unsupported type: {cl!r}. Register a structure hook for it."
|
|
raise StructureHandlerNotFoundError(msg, type_=cl)
|