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"""Word stemming utilities for Sphinx.
:copyright: Copyright 2007-2022 by the Sphinx team, see AUTHORS.
:license: BSD, see LICENSE for details.
"""
from sphinx.util.stemmer.porter import PorterStemmer
try:
from Stemmer import Stemmer as _PyStemmer
PYSTEMMER = True
except ImportError:
PYSTEMMER = False
class BaseStemmer:
def stem(self, word: str) -> str:
raise NotImplementedError()
class PyStemmer(BaseStemmer):
def __init__(self) -> None:
self.stemmer = _PyStemmer('porter')
def stem(self, word: str) -> str:
return self.stemmer.stemWord(word)
class StandardStemmer(PorterStemmer, BaseStemmer):
"""All those porter stemmer implementations look hideous;
make at least the stem method nicer.
"""
def stem(self, word: str) -> str: # type: ignore
return super().stem(word, 0, len(word) - 1)
def get_stemmer() -> BaseStemmer:
if PYSTEMMER:
return PyStemmer()
else:
return StandardStemmer()
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