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# -*- coding: utf-8 -*- |
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# Copyright 2019 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._inclusion. |
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Bouchard & Pouyez's INClusion Programme |
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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 ._distance import _Distance |
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from ._levenshtein import Levenshtein |
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__all__ = ['Inclusion'] |
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class Inclusion(_Distance): |
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"""Inclusion distance. |
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The INC Programme, developed by :cite:`Bouchard:1980` designates two |
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terms as being "included" when: |
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- One name is shorter than the other |
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- There are at least 3 common characters |
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- There is at most one difference, disregarding unmatching |
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prefixes and suffixes |
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In addition to these rules, this implementation considers two terms |
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as being "included" if they are identical. |
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The return value, though a float, can only take one of two values: |
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0.0, indicating inclusion, or 1.0, indication non-inclusion. |
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.. versionadded:: 0.4.1 |
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""" |
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_lev = Levenshtein() |
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def dist(self, src, tar): |
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"""Return the INClusion Programme value of two words. |
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Parameters |
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---------- |
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src : str |
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Source string for comparison |
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tar : str |
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Target string for comparison |
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Returns |
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------- |
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float |
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The INC Programme distance |
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Examples |
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-------- |
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>>> cmp = Inclusion() |
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>>> round(cmp.dist('cat', 'hat'), 12) |
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1.0 |
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>>> round(cmp.dist('Niall', 'Neil'), 12) |
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1.0 |
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>>> cmp.dist('aluminum', 'Catalan') |
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1.0 |
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>>> cmp.dist('ATCG', 'TAGC') |
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1.0 |
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.. versionadded:: 0.4.1 |
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""" |
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if src == tar: |
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return 0.0 |
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if len(src) == len(tar): |
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return 1.0 |
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diff, src, tar = self._lev.alignment(src, tar) |
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src = list(src) |
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tar = list(tar) |
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while src and src[0] == '-': |
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src.pop(0) |
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tar.pop(0) |
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diff -= 1 |
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while tar and tar[0] == '-': |
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src.pop(0) |
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tar.pop(0) |
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diff -= 1 |
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while src and src[-1] == '-': |
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src.pop(0) |
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tar.pop(0) |
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diff -= 1 |
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while tar and tar[-1] == '-': |
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src.pop(0) |
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tar.pop(0) |
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diff -= 1 |
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if diff > 1: |
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return 1.0 |
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if len(src) - diff < 3: |
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return 1.0 |
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return 0.0 |
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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
