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#
# Pyserini: Reproducible IR research with sparse and dense representations
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
from typing import List
from ..pyclass import autoclass
# Wrappers around Lucene classes
JAnalyzer = autoclass('org.apache.lucene.analysis.Analyzer')
JArabicAnalyzer = autoclass('org.apache.lucene.analysis.ar.ArabicAnalyzer')
JBengaliAnalyzer = autoclass('org.apache.lucene.analysis.bn.BengaliAnalyzer')
JCJKAnalyzer = autoclass('org.apache.lucene.analysis.cjk.CJKAnalyzer')
JDanishAnalyzer = autoclass('org.apache.lucene.analysis.da.DanishAnalyzer')
JDefaultEnglishAnalyzer = autoclass('io.anserini.analysis.DefaultEnglishAnalyzer')
JDutchAnalyzer = autoclass('org.apache.lucene.analysis.nl.DutchAnalyzer')
JFinnishAnalyzer = autoclass('org.apache.lucene.analysis.fi.FinnishAnalyzer')
JFrenchAnalyzer = autoclass('org.apache.lucene.analysis.fr.FrenchAnalyzer')
JGermanAnalyzer = autoclass('org.apache.lucene.analysis.de.GermanAnalyzer')
JHindiAnalyzer = autoclass('org.apache.lucene.analysis.hi.HindiAnalyzer')
JHungarianAnalyzer = autoclass('org.apache.lucene.analysis.hu.HungarianAnalyzer')
JIndonesianAnalyzer = autoclass('org.apache.lucene.analysis.id.IndonesianAnalyzer')
JItalianAnalyzer = autoclass('org.apache.lucene.analysis.it.ItalianAnalyzer')
JJapaneseAnalyzer = autoclass('org.apache.lucene.analysis.ja.JapaneseAnalyzer')
JNorwegianAnalyzer = autoclass('org.apache.lucene.analysis.no.NorwegianAnalyzer')
JPortugueseAnalyzer = autoclass('org.apache.lucene.analysis.pt.PortugueseAnalyzer')
JRussianAnalyzer = autoclass('org.apache.lucene.analysis.ru.RussianAnalyzer')
JSpanishAnalyzer = autoclass('org.apache.lucene.analysis.es.SpanishAnalyzer')
JSwedishAnalyzer = autoclass('org.apache.lucene.analysis.sv.SwedishAnalyzer')
JTeluguAnalyzer = autoclass('org.apache.lucene.analysis.te.TeluguAnalyzer')
JThaiAnalyzer = autoclass('org.apache.lucene.analysis.th.ThaiAnalyzer')
JTurkishAnalyzer = autoclass('org.apache.lucene.analysis.tr.TurkishAnalyzer')
JWhiteSpaceAnalyzer = autoclass('org.apache.lucene.analysis.core.WhitespaceAnalyzer')
JCharArraySet = autoclass('org.apache.lucene.analysis.CharArraySet')
# Wrappers around Anserini classes
JAnalyzerUtils = autoclass('io.anserini.analysis.AnalyzerUtils')
JDefaultEnglishAnalyzer = autoclass('io.anserini.analysis.DefaultEnglishAnalyzer')
JTweetAnalyzer = autoclass('io.anserini.analysis.TweetAnalyzer')
JHuggingFaceTokenizerAnalyzer = autoclass('io.anserini.analysis.HuggingFaceTokenizerAnalyzer')
def get_lucene_analyzer(language: str='en', stemming: bool=True, stemmer: str='porter', stopwords: bool=True, huggingFaceTokenizer: str=None) -> JAnalyzer:
"""Create a Lucene ``Analyzer`` with specific settings.
Parameters
----------
language : str
Name of analyzer.
stemming : bool
Set to stem.
stemmer : str
Stemmer to use.
stopwords : bool
Set to filter stopwords.
huggingFaceTokenizer: str
a huggingface model id or path to a tokenizer.json file
Returns
-------
JAnalyzer
Java ``Analyzer`` with specified settings.
"""
if language.lower() == 'ar':
return JArabicAnalyzer()
elif language.lower() == 'bn':
return JBengaliAnalyzer()
elif language.lower() in ['zh', 'ko']:
return JCJKAnalyzer()
elif language.lower() == 'da':
return JDanishAnalyzer()
elif language.lower() == 'nl':
return JDutchAnalyzer()
elif language.lower() == 'fi':
return JFinnishAnalyzer()
elif language.lower() == 'fr':
return JFrenchAnalyzer()
elif language.lower() == 'de':
return JGermanAnalyzer()
elif language.lower() == 'hi':
return JHindiAnalyzer()
elif language.lower() == 'hu':
return JHungarianAnalyzer()
elif language.lower() == 'id':
return JIndonesianAnalyzer()
elif language.lower() == 'it':
return JItalianAnalyzer()
elif language.lower() == 'ja':
return JJapaneseAnalyzer()
elif language.lower() == 'no':
return JNorwegianAnalyzer()
elif language.lower() == 'pt':
return JPortugueseAnalyzer()
elif language.lower() == 'ru':
return JRussianAnalyzer()
elif language.lower() == 'es':
return JSpanishAnalyzer()
elif language.lower() == 'te':
return JTeluguAnalyzer()
elif language.lower() == 'th':
return JThaiAnalyzer()
elif language.lower() == 'tr':
return JTurkishAnalyzer()
elif language.lower() == 'tweet':
return JTweetAnalyzer()
elif language.lower() == 'hgf_tokenizer':
return JHuggingFaceTokenizerAnalyzer(huggingFaceTokenizer)
elif language.lower() == 'en':
if stemming:
if stopwords:
return JDefaultEnglishAnalyzer.newStemmingInstance(stemmer)
else:
return JDefaultEnglishAnalyzer.newStemmingInstance(stemmer, JCharArraySet.EMPTY_SET)
else:
if stopwords:
return JDefaultEnglishAnalyzer.newNonStemmingInstance()
else:
return JDefaultEnglishAnalyzer.newNonStemmingInstance(JCharArraySet.EMPTY_SET)
else:
raise ValueError('Invalid configuration.')
class Analyzer:
"""Python wrapper around a Lucene ``Analyzer`` to simplify analysis.
Parameters
----------
analyzer : JAnalyzer
Lucene ``Analyzer``.
"""
def __init__(self, analyzer):
if not isinstance(analyzer, JAnalyzer):
raise TypeError('Invalid JAnalyzer!')
self.analyzer = analyzer
def analyze(self, text: str) -> List[str]:
"""Analyze a piece of text.
Parameters
----------
text : str
Text to analyze.
Returns
-------
List[str]
List of tokens corresponding to the output of the analyzer.
"""
results = JAnalyzerUtils.analyze(self.analyzer, text)
tokens = []
for token in results.toArray():
tokens.append(token)
return tokens
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