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bibindex_engine_stemmer.py
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Fri, May 3, 15:10

bibindex_engine_stemmer.py
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## $Id$
## This file is part of CDS Invenio.
## Copyright (C) 2002, 2003, 2004, 2005, 2006 CERN.
##
## CDS Invenio 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 2 of the
## License, or (at your option) any later version.
##
## CDS Invenio 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 CDS Invenio; if not, write to the Free Software Foundation, Inc.,
## 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
from invenio.bibindex_engine_config import *
def create_stemmers():
"""Create stemmers dictionary for all possible languages."""
languages = {'fr': 'french', 'en': 'english', 'no':'norwegian', 'sv':'swedish', 'de': 'german', 'it':'italian', 'pt':'portuguese'}
stemmers = {}
try:
import Stemmer
for (key, value) in languages.iteritems():
stemmers[key] = Stemmer.Stemmer(value)
except ImportError:
pass # PyStemmer isn't available
return stemmers
stemmers = create_stemmers()
def is_stemmer_available_for_language(lang):
"""Return true if stemmer for language LANG is available.
Return false otherwise.
"""
return stemmers.has_key(lang)
def stem(word, lang=cfg_bibindex_stemmer_default_language):
"""Return WORD stemmed according to language LANG (e.g. 'en')."""
if lang and is_stemmer_available_for_language(lang):
return stemmers[lang].stem(word)
else:
return word

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