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"""Utilities for handling privileges."""
from typing import Union, TypeAlias
PrivilegesList = tuple[str, ...]
CheckObj = tuple[str, PrivilegesList] # where the first item is either "OR" or "AND"
Checks: TypeAlias = Union[
CheckObj,
tuple[str, tuple['Checks', ...]]]
class SpecificationValueError(ValueError):
"""Raised when there is an error in the specification string."""
pass
def parse(spec: str) -> Checks:
"""Parse a string specification for privileges and return a tree of data
objects of the form (<operator> (<check>))"""
# if(spec.strip() == ""):
# raise SpecificationValueError(
# "You passed an empty specification. I do not know what to do.")
return tuple()
def check(spec: str, privileges: tuple[str, ...]) -> bool:
"""Check that the sequence of `privileges` satisfies `spec`."""
return False
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