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# Copyright 2018-2020 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._position. |
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Cisłak & Grabowski's position fingerprint |
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""" |
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from typing import Dict, Tuple |
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from ._fingerprint import MOST_COMMON_LETTERS_CG, _Fingerprint |
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__all__ = ['Position'] |
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class Position(_Fingerprint): |
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"""Position Fingerprint. |
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Based on the position fingerprint from :cite:`Cislak:2017`. |
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.. versionadded:: 0.3.6 |
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""" |
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def __init__( |
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self, |
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n_bits: int = 16, |
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most_common: Tuple[str, ...] = MOST_COMMON_LETTERS_CG, |
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bits_per_letter: int = 3, |
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) -> None: |
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"""Initialize Count instance. |
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Parameters |
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---------- |
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n_bits : int |
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Number of bits in the fingerprint returned |
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most_common : list |
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The most common tokens in the target language, ordered by frequency |
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.. versionadded:: 0.4.0 |
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""" |
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super(Position, self).__init__() |
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self._n_bits = n_bits |
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self._most_common = most_common |
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self._bits_per_letter = bits_per_letter |
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def fingerprint(self, word: str) -> str: |
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"""Return the position fingerprint. |
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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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str |
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The position fingerprint |
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Examples |
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-------- |
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>>> pf = Position() |
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>>> pf.fingerprint('hat') |
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'1110100011111111' |
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>>> pf.fingerprint('niall') |
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'1111110101110010' |
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>>> pf.fingerprint('colin') |
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'1111111110010111' |
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>>> pf.fingerprint('atcg') |
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'1110010001111111' |
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>>> pf.fingerprint('entreatment') |
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'0000101011111111' |
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.. versionadded:: 0.3.0 |
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.. versionchanged:: 0.3.6 |
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Encapsulated in class |
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.. versionchanged:: 0.6.0 |
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Changed to return a str and added fingerprint_int method |
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""" |
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return ('{:0' + str(self._n_bits) + 'b}').format( |
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self.fingerprint_int(word) |
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) |
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def fingerprint_int(self, word: str) -> int: |
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"""Return the position fingerprint. |
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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 position fingerprint as an int |
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Examples |
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-------- |
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>>> pf = Position() |
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>>> pf.fingerprint_int('hat') |
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1 |
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59647 |
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>>> pf.fingerprint_int('niall') |
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1 |
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64882 |
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>>> pf.fingerprint_int('colin') |
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1 |
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65431 |
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>>> pf.fingerprint_int('atcg') |
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58495 |
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>>> pf.fingerprint_int('entreatment') |
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2815 |
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.. versionadded:: 0.6.0 |
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""" |
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n_bits = self._n_bits |
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position = {} # type: Dict[str, int] |
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for pos, letter in enumerate(word): |
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if letter not in position and letter in self._most_common: |
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position[letter] = min(pos, 2 ** self._bits_per_letter - 1) |
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fingerprint = 0 |
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for letter in self._most_common: |
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if n_bits: |
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fingerprint <<= min(self._bits_per_letter, n_bits) |
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if letter in position: |
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fingerprint += min(position[letter], 2 ** n_bits - 1) |
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else: |
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fingerprint += min( |
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2 ** self._bits_per_letter - 1, 2 ** n_bits - 1 |
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) |
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n_bits -= min(self._bits_per_letter, n_bits) |
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else: |
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break |
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for _ in range(n_bits): |
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fingerprint <<= 1 |
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fingerprint += 1 |
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return fingerprint |
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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
