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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.fingerprint._lacss. |
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L.A. County Sheriff's System fingerprint |
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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 ._fingerprint import _Fingerprint |
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__all__ = ['LACSS'] |
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class LACSS(_Fingerprint): |
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"""L.A. County Sheriff's System fingerprint. |
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Based on the description from :cite:`Taft:1970`. |
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.. versionadded:: 0.4.1 |
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""" |
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_vowels = set('AEIOUYWH') |
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_t1 = {_[0]: _[1] for _ in zip('RNLTSCMDKAGBPFVZXJQ', range(1, 20))} |
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_t1.update({_: 0 for _ in _vowels}) |
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_t2 = {_[0]: _[1] for _ in zip('ABCDEFGHIJKLMNOPQRSTUVWXYZ', range(1, 27))} |
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def fingerprint(self, word): |
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"""Return the LACSS coding. |
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Parameters |
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---------- |
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word : str |
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The word to fingerprint |
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Returns |
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------- |
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int |
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The L.A. County Sheriff's System fingerprint |
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Examples |
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-------- |
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>>> cf = LACSS() |
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>>> cf.fingerprint('hat') |
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'4911211' |
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>>> cf.fingerprint('niall') |
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'6488374' |
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>>> cf.fingerprint('colin') |
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'3015957' |
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>>> cf.fingerprint('atcg') |
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'1772371' |
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>>> cf.fingerprint('entreatment') |
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'3882324' |
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.. versionadded:: 0.4.1 |
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""" |
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# uppercase |
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word = word.upper() |
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# remove vowels |
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word = word[:1] + ''.join(_ for _ in word[1:] if _ not in 'AEIOUWHY') |
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word += 12 * 'A' |
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# step 1 |
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code = 0 |
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i = 0 |
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while (not code) and (i < len(word)): |
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if word[i] in self._t2: |
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code = self._t2[word[i]] * 10 |
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i += 1 |
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letters = 11 |
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while letters and i < len(word): |
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if word[i] in self._t1: |
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code *= 10 |
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code += self._t1[word[i]] |
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letters -= 1 |
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i += 1 |
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code *= 3 |
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code = str(int(code ** 0.5)) |
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return code |
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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
