# Copyright 2018 The GamePad Authors. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# ==============================================================================


class GenSym(object):
    """Symbol generation
    """
    def __init__(self, prefix=None):
        self.cnt = 0
        self.prefix = prefix

    def gensym(self):
        idx = self.cnt
        self.cnt += 1
        if self.prefix:
            return "{}{}".format(self.prefix, idx)
        else:
            return idx
