# Copyright 2018-2020 by Christopher C. Little.
# This file is part of Abydos.
#
# Abydos is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Abydos is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Abydos. If not, see <http://www.gnu.org/licenses/>.
"""abydos.tokenizer._character.
Character tokenizer
"""
from ._tokenizer import _Tokenizer
__all__ = ['CharacterTokenizer']
[docs]class CharacterTokenizer(_Tokenizer):
"""A character tokenizer.
.. versionadded:: 0.4.0
"""
def __init__(self, scaler=None):
"""Initialize tokenizer.
Parameters
----------
scaler : None, str, or function
A scaling function for the Counter:
- None : no scaling
- 'set' : All non-zero values are set to 1.
- a callable function : The function is applied to each value
in the Counter. Some useful functions include math.exp,
math.log1p, math.sqrt, and indexes into interesting integer
sequences such as the Fibonacci sequence.
.. versionadded:: 0.4.0
"""
super(CharacterTokenizer, self).__init__(scaler)
[docs] def tokenize(self, string):
"""Tokenize the term and store it.
The tokenized term is stored as an ordered list and as a Counter
object.
Parameters
----------
string : str
The string to tokenize
Examples
--------
>>> CharacterTokenizer().tokenize('AACTAGAAC')
CharacterTokenizer({'A': 5, 'C': 2, 'T': 1, 'G': 1})
.. versionadded:: 0.4.0
"""
self._string = string
self._ordered_tokens = list(string)
super(CharacterTokenizer, self).tokenize()
return self
if __name__ == '__main__':
import doctest
doctest.testmod()