#! /usr/bin/env python

# Copyright (c) 2019 Victor Terron. All rights reserved.
#
# This file is part of LEMON.
#
# LEMON 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 3 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 <http://www.gnu.org/licenses/>.

import functools


def memoize(f):
    """Minimalistic memoization decorator (*args / **kwargs)
    Based on: http://code.activestate.com/recipes/577219/"""

    cache = {}

    @functools.wraps(f)
    def memf(*args, **kwargs):
        fkwargs = frozenset(kwargs.iteritems())
        if (args, fkwargs) not in cache:
            cache[args, fkwargs] = f(*args, **kwargs)
        return cache[args, fkwargs]

    return memf
