abydos.stemmer._clef

Complexity

Total Complexity

35

Size/Duplication

Total Lines	178
Duplicated Lines	0 %

Test Coverage

Coverage

100%

Importance

Changes

0

3 Functions

Rating	Name	Duplication	Size	Complexity
B	clef_german()	0	36	7
F	clef_german_plus()	0	49	15
D	clef_swedish()	0	46	13

# -*- coding: utf-8 -*-

# Copyright 2014-2018 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.stemmer._clef.

The stemmer._clef module defines CLEF stemmers for:

    - German
    - German plus
    - Swedish
"""

from __future__ import unicode_literals

from unicodedata import normalize

from six import text_type

__all__ = ['clef_german', 'clef_german_plus', 'clef_swedish']


def clef_german(word):
    """Return CLEF German stem.

    The CLEF German stemmer is defined at :cite:`Savoy:2005`.

    :param str word: the word to calculate the stem of
    :returns: word stem
    :rtype: str

    >>> clef_german('lesen')
    'lese'
    >>> clef_german('graues')
    'grau'
    >>> clef_german('buchstabieren')
    'buchstabier'
    """
    # lowercase, normalize, and compose
    word = normalize('NFC', text_type(word.lower()))

    # remove umlauts
    _umlauts = dict(zip((ord(_) for _ in 'äöü'), 'aou'))

The variable _ does not seem to be defined.

    word = word.translate(_umlauts)

    # remove plurals
    wlen = len(word) - 1

    if wlen > 3:
        if wlen > 5:
            if word[-3:] == 'nen':
                return word[:-3]
        if wlen > 4:
            if word[-2:] in {'en', 'se', 'es', 'er'}:
                return word[:-2]
        if word[-1] in {'e', 'n', 'r', 's'}:
            return word[:-1]
    return word


def clef_german_plus(word):
    """Return 'CLEF German stemmer plus' stem.

    The CLEF German stemmer plus is defined at :cite:`Savoy:2005`.

    :param str word: the word to calculate the stem of
    :returns: word stem
    :rtype: str

    >>> clef_german_plus('lesen')
    'les'
    >>> clef_german_plus('graues')
    'grau'
    >>> clef_german_plus('buchstabieren')
    'buchstabi'
    """
    _st_ending = {'b', 'd', 'f', 'g', 'h', 'k', 'l', 'm', 'n', 't'}

    # lowercase, normalize, and compose
    word = normalize('NFC', text_type(word.lower()))

    # remove umlauts
    _accents = dict(
        zip((ord(_) for _ in 'äàáâöòóôïìíîüùúû'), 'aaaaooooiiiiuuuu')

The variable _ does not seem to be defined.

    )
    word = word.translate(_accents)

    # Step 1
    wlen = len(word) - 1
    if wlen > 4 and word[-3:] == 'ern':
        word = word[:-3]
    elif wlen > 3 and word[-2:] in {'em', 'en', 'er', 'es'}:
        word = word[:-2]
    elif wlen > 2 and (
        word[-1] == 'e' or (word[-1] == 's' and word[-2] in _st_ending)

Wrong hanging indentation before block (add 4 spaces).

    ):
        word = word[:-1]

    # Step 2
    wlen = len(word) - 1
    if wlen > 4 and word[-3:] == 'est':
        word = word[:-3]
    elif wlen > 3 and (
        word[-2:] in {'er', 'en'}

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        or (word[-2:] == 'st' and word[-3] in _st_ending)

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    ):
        word = word[:-2]

    return word


def clef_swedish(word):
    """Return CLEF Swedish stem.

    The CLEF Swedish stemmer is defined at :cite:`Savoy:2005`.

    :param str word: the word to calculate the stem of
    :returns: word stem
    :rtype: str

    >>> clef_swedish('undervisa')
    'undervis'
    >>> clef_swedish('suspension')
    'suspensio'
    >>> clef_swedish('visshet')
    'viss'
    """
    wlen = len(word) - 1

    if wlen > 3 and word[-1] == 's':
        word = word[:-1]
        wlen -= 1

    if wlen > 6:
        if word[-5:] in {'elser', 'heten'}:
            return word[:-5]
    if wlen > 5:
        if word[-4:] in {
            'arne',

Wrong hanging indentation before block (add 4 spaces).

            'erna',

Wrong hanging indentation before block (add 4 spaces).

            'ande',

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            'else',

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            'aste',

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            'orna',

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            'aren',

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        }:
            return word[:-4]
    if wlen > 4:
        if word[-3:] in {'are', 'ast', 'het'}:
            return word[:-3]
    if wlen > 3:
        if word[-2:] in {'ar', 'er', 'or', 'en', 'at', 'te', 'et'}:
            return word[:-2]
    if wlen > 2:
        if word[-1] in {'a', 'e', 'n', 't'}:
            return word[:-1]
    return word


if __name__ == '__main__':
    import doctest

    doctest.testmod()