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from functools import wraps
from typing import Callable, List
from pydecor import export
@export
def EnumLookupTable(cls) -> Callable:
"""
Decorator to precalculate a enum lookup table (LUT) for enum position to
enum literal name.
.. todo:: Make compatible to chained decorators
:param cls: Enumerator class for which a LUT shall be pre-calculated.
"""
def decorator(func) -> Callable:
def gen() -> List[str]:
d = [e for e in dir(cls) if e[0] != "_"]
res = [None] * len(d)
for e in d:
res[getattr(cls, e)] = e
return res
__lut = gen()
def wrapper(id: int) -> str:
# function that replaces the placeholder function
return __lut[id]
return wrapper
return decorator
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