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# =============================================================================
# ____ _ _ ____ _ _ _ _ _ _ _
# _ __ _ _ / ___| | | | _ \| | | (_) |__ __ _| |__ __| | |
# | '_ \| | | | | _| |_| | | | | | | | | '_ \ / _` | '_ \ / _` | |
# | |_) | |_| | |_| | _ | |_| | |___ _| | | |_) | (_| | | | | (_| | |
# | .__/ \__, |\____|_| |_|____/|_____(_)_|_|_.__/ \__, |_| |_|\__,_|_|
# |_| |___/ |___/
# =============================================================================
# Authors:
# Patrick Lehmann
#
# Package module: Python binding and low-level API for shared library 'libghdl'.
#
# License:
# ============================================================================
# Copyright (C) 2019-2021 Tristan Gingold
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <gnu.org/licenses>.
#
# SPDX-License-Identifier: GPL-2.0-or-later
# ============================================================================
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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