| /* |
| * |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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. |
| * |
| */ |
| |
| using System; |
| using System.Collections.Generic; |
| using System.IO; |
| using System.Text; |
| using System.Collections; |
| |
| using Lucene.Net.Analysis; |
| using Lucene.Net.Analysis.De; |
| using Lucene.Net.Analysis.Standard; |
| using Version = Lucene.Net.Util.Version; |
| |
| namespace Lucene.Net.Analysis.Fr |
| { |
| /* |
| * {@link Analyzer} for French language. |
| * <p> |
| * Supports an external list of stopwords (words that |
| * will not be indexed at all) and an external list of exclusions (word that will |
| * not be stemmed, but indexed). |
| * A default set of stopwords is used unless an alternative list is specified, but the |
| * exclusion list is empty by default. |
| * </p> |
| * |
| * <a name="version"/> |
| * <p>You must specify the required {@link Version} |
| * compatibility when creating FrenchAnalyzer: |
| * <ul> |
| * <li> As of 2.9, StopFilter preserves position |
| * increments |
| * </ul> |
| * |
| * <p><b>NOTE</b>: This class uses the same {@link Version} |
| * dependent settings as {@link StandardAnalyzer}.</p> |
| */ |
| public sealed class FrenchAnalyzer : Analyzer |
| { |
| |
| /* |
| * Extended list of typical French stopwords. |
| * @deprecated use {@link #getDefaultStopSet()} instead |
| */ |
| // TODO make this private in 3.1 |
| public readonly static String[] FRENCH_STOP_WORDS = { |
| "a", "afin", "ai", "ainsi", "après", "attendu", "au", "aujourd", "auquel", "aussi", |
| "autre", "autres", "aux", "auxquelles", "auxquels", "avait", "avant", "avec", "avoir", |
| "c", "car", "ce", "ceci", "cela", "celle", "celles", "celui", "cependant", "certain", |
| "certaine", "certaines", "certains", "ces", "cet", "cette", "ceux", "chez", "ci", |
| "combien", "comme", "comment", "concernant", "contre", "d", "dans", "de", "debout", |
| "dedans", "dehors", "delà", "depuis", "derrière", "des", "désormais", "desquelles", |
| "desquels", "dessous", "dessus", "devant", "devers", "devra", "divers", "diverse", |
| "diverses", "doit", "donc", "dont", "du", "duquel", "durant", "dès", "elle", "elles", |
| "en", "entre", "environ", "est", "et", "etc", "etre", "eu", "eux", "excepté", "hormis", |
| "hors", "hélas", "hui", "il", "ils", "j", "je", "jusqu", "jusque", "l", "la", "laquelle", |
| "le", "lequel", "les", "lesquelles", "lesquels", "leur", "leurs", "lorsque", "lui", "là", |
| "ma", "mais", "malgré", "me", "merci", "mes", "mien", "mienne", "miennes", "miens", "moi", |
| "moins", "mon", "moyennant", "même", "mêmes", "n", "ne", "ni", "non", "nos", "notre", |
| "nous", "néanmoins", "nôtre", "nôtres", "on", "ont", "ou", "outre", "où", "par", "parmi", |
| "partant", "pas", "passé", "pendant", "plein", "plus", "plusieurs", "pour", "pourquoi", |
| "proche", "près", "puisque", "qu", "quand", "que", "quel", "quelle", "quelles", "quels", |
| "qui", "quoi", "quoique", "revoici", "revoilà", "s", "sa", "sans", "sauf", "se", "selon", |
| "seront", "ses", "si", "sien", "sienne", "siennes", "siens", "sinon", "soi", "soit", |
| "son", "sont", "sous", "suivant", "sur", "ta", "te", "tes", "tien", "tienne", "tiennes", |
| "tiens", "toi", "ton", "tous", "tout", "toute", "toutes", "tu", "un", "une", "va", "vers", |
| "voici", "voilà", "vos", "votre", "vous", "vu", "vôtre", "vôtres", "y", "à", "ça", "ès", |
| "été", "être", "ô" |
| }; |
| |
| /* |
| * Contains the stopwords used with the {@link StopFilter}. |
| */ |
| private readonly ISet<string> stoptable; |
| /* |
| * Contains words that should be indexed but not stemmed. |
| */ |
| //TODO make this final in 3.0 |
| private ISet<string> excltable = Support.Compatibility.SetFactory.CreateHashSet<string>(); |
| |
| private readonly Version matchVersion; |
| |
| /* |
| * Returns an unmodifiable instance of the default stop-words set. |
| * @return an unmodifiable instance of the default stop-words set. |
| */ |
| public static ISet<string> GetDefaultStopSet() |
| { |
| return DefaultSetHolder.DEFAULT_STOP_SET; |
| } |
| |
| static class DefaultSetHolder |
| { |
| internal static ISet<string> DEFAULT_STOP_SET = CharArraySet.UnmodifiableSet(new CharArraySet((IEnumerable<string>)FRENCH_STOP_WORDS, false)); |
| } |
| |
| /* |
| * Builds an analyzer with the default stop words ({@link #FRENCH_STOP_WORDS}). |
| */ |
| public FrenchAnalyzer(Version matchVersion) |
| : this(matchVersion, DefaultSetHolder.DEFAULT_STOP_SET) |
| { |
| |
| } |
| |
| /* |
| * Builds an analyzer with the given stop words |
| * |
| * @param matchVersion |
| * lucene compatibility version |
| * @param stopwords |
| * a stopword set |
| */ |
| public FrenchAnalyzer(Version matchVersion, ISet<string> stopwords) |
| : this(matchVersion, stopwords, CharArraySet.EMPTY_SET) |
| { |
| } |
| |
| /* |
| * Builds an analyzer with the given stop words |
| * |
| * @param matchVersion |
| * lucene compatibility version |
| * @param stopwords |
| * a stopword set |
| * @param stemExclutionSet |
| * a stemming exclusion set |
| */ |
| public FrenchAnalyzer(Version matchVersion, ISet<string> stopwords, ISet<string> stemExclutionSet) |
| { |
| this.matchVersion = matchVersion; |
| this.stoptable = CharArraySet.UnmodifiableSet(CharArraySet.Copy(stopwords)); |
| this.excltable = CharArraySet.UnmodifiableSet(CharArraySet.Copy(stemExclutionSet)); |
| } |
| |
| |
| /* |
| * Builds an analyzer with the given stop words. |
| * @deprecated use {@link #FrenchAnalyzer(Version, Set)} instead |
| */ |
| public FrenchAnalyzer(Version matchVersion, params string[] stopwords) |
| : this(matchVersion, StopFilter.MakeStopSet(stopwords)) |
| { |
| |
| } |
| |
| /* |
| * Builds an analyzer with the given stop words. |
| * @throws IOException |
| * @deprecated use {@link #FrenchAnalyzer(Version, Set)} instead |
| */ |
| public FrenchAnalyzer(Version matchVersion, FileInfo stopwords) |
| : this(matchVersion, WordlistLoader.GetWordSet(stopwords)) |
| { |
| } |
| |
| /* |
| * Builds an exclusionlist from an array of Strings. |
| * @deprecated use {@link #FrenchAnalyzer(Version, Set, Set)} instead |
| */ |
| public void SetStemExclusionTable(params string[] exclusionlist) |
| { |
| excltable = StopFilter.MakeStopSet(exclusionlist); |
| PreviousTokenStream = null; // force a new stemmer to be created |
| } |
| |
| /* |
| * Builds an exclusionlist from a Map. |
| * @deprecated use {@link #FrenchAnalyzer(Version, Set, Set)} instead |
| */ |
| public void SetStemExclusionTable(IDictionary<string, string> exclusionlist) |
| { |
| excltable = Support.Compatibility.SetFactory.CreateHashSet(exclusionlist.Keys); |
| PreviousTokenStream = null; // force a new stemmer to be created |
| } |
| |
| /* |
| * Builds an exclusionlist from the words contained in the given file. |
| * @throws IOException |
| * @deprecated use {@link #FrenchAnalyzer(Version, Set, Set)} instead |
| */ |
| public void SetStemExclusionTable(FileInfo exclusionlist) |
| { |
| excltable = WordlistLoader.GetWordSet(exclusionlist); |
| PreviousTokenStream = null; // force a new stemmer to be created |
| } |
| |
| /* |
| * Creates a {@link TokenStream} which tokenizes all the text in the provided |
| * {@link Reader}. |
| * |
| * @return A {@link TokenStream} built from a {@link StandardTokenizer} |
| * filtered with {@link StandardFilter}, {@link StopFilter}, |
| * {@link FrenchStemFilter} and {@link LowerCaseFilter} |
| */ |
| public override sealed TokenStream TokenStream(String fieldName, TextReader reader) |
| { |
| TokenStream result = new StandardTokenizer(matchVersion, reader); |
| result = new StandardFilter(result); |
| result = new StopFilter(StopFilter.GetEnablePositionIncrementsVersionDefault(matchVersion), |
| result, stoptable); |
| result = new FrenchStemFilter(result, excltable); |
| // Convert to lowercase after stemming! |
| result = new LowerCaseFilter(result); |
| return result; |
| } |
| |
| class SavedStreams |
| { |
| protected internal Tokenizer source; |
| protected internal TokenStream result; |
| }; |
| |
| /* |
| * Returns a (possibly reused) {@link TokenStream} which tokenizes all the |
| * text in the provided {@link Reader}. |
| * |
| * @return A {@link TokenStream} built from a {@link StandardTokenizer} |
| * filtered with {@link StandardFilter}, {@link StopFilter}, |
| * {@link FrenchStemFilter} and {@link LowerCaseFilter} |
| */ |
| public override TokenStream ReusableTokenStream(String fieldName, TextReader reader) |
| { |
| SavedStreams streams = (SavedStreams)PreviousTokenStream; |
| if (streams == null) |
| { |
| streams = new SavedStreams(); |
| streams.source = new StandardTokenizer(matchVersion, reader); |
| streams.result = new StandardFilter(streams.source); |
| streams.result = new StopFilter(StopFilter.GetEnablePositionIncrementsVersionDefault(matchVersion), |
| streams.result, stoptable); |
| streams.result = new FrenchStemFilter(streams.result, excltable); |
| // Convert to lowercase after stemming! |
| streams.result = new LowerCaseFilter(streams.result); |
| PreviousTokenStream = streams; |
| } |
| else |
| { |
| streams.source.Reset(reader); |
| } |
| return streams.result; |
| } |
| } |
| } |
