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# -*- coding: utf-8 -*- |
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# Copyright 2018 by Christopher C. Little. |
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# This file is part of Abydos. |
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# |
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# Abydos is free software: you can redistribute it and/or modify |
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# it under the terms of the GNU General Public License as published by |
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# the Free Software Foundation, either version 3 of the License, or |
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# (at your option) any later version. |
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# |
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# Abydos is distributed in the hope that it will be useful, |
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# but WITHOUT ANY WARRANTY; without even the implied warranty of |
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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# GNU General Public License for more details. |
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# |
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# You should have received a copy of the GNU General Public License |
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# along with Abydos. If not, see <http://www.gnu.org/licenses/>. |
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"""abydos.distance._token_distance. |
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The distance._TokenDistance module implements abstract class _TokenDistance. |
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""" |
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from __future__ import ( |
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absolute_import, |
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division, |
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print_function, |
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unicode_literals, |
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) |
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from collections import Counter |
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from ._distance import _Distance |
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from ..tokenizer import QGrams |
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class _TokenDistance(_Distance): |
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"""Abstract Token Distance class.""" |
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def _get_qgrams(self, src, tar, qval=0, skip=0): |
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"""Return the Q-Grams in src & tar. |
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Parameters |
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---------- |
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src : str |
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Source string (or QGrams/Counter objects) for comparison |
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tar : str |
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Target string (or QGrams/Counter objects) for comparison |
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qval : int |
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The length of each q-gram; 0 for non-q-gram version |
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skip : int |
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The number of characters to skip (only works when src and tar are |
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strings) |
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Returns |
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------- |
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tuple of Counters |
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Q-Grams |
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Examples |
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-------- |
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>>> pe = _TokenDistance() |
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>>> pe._get_qgrams('AT', 'TT', qval=2) |
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(QGrams({'$A': 1, 'AT': 1, 'T#': 1}), |
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QGrams({'$T': 1, 'TT': 1, 'T#': 1})) |
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""" |
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if isinstance(src, Counter) and isinstance(tar, Counter): |
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return src, tar |
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if qval > 0: |
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return QGrams(src, qval, '$#', skip), QGrams(tar, qval, '$#', skip) |
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return Counter(src.strip().split()), Counter(tar.strip().split()) |
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if __name__ == '__main__': |
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import doctest |
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doctest.testmod() |
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chrislit /
abydos
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