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37 lines
1.0 KiB
37 lines
1.0 KiB
#-*- coding: utf-8 -*-
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# Copyright 2014 Calculate Ltd. http://www.calculate-linux.org
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from itertools import tee
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class SavableIterator:
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def __init__(self,seq):
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self.seq = iter(seq)
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self.back = None
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def __iter__(self):
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return self
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def save(self):
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self.seq, self.back = tee(self.seq)
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def restore(self):
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if self.back:
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self.seq, self.back = tee(self.back)
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def next(self):
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return self.seq.next()
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