| // Lucene version compatibility level 8.6.1 |
| using ICU4N; |
| using ICU4N.Globalization; |
| using ICU4N.Text; |
| using Lucene.Net.Analysis.Util; |
| using Lucene.Net.Diagnostics; |
| using Lucene.Net.Support; |
| using Lucene.Net.Util; |
| using System; |
| using System.Collections.Generic; |
| using System.Diagnostics; |
| using System.IO; |
| using System.Text; |
| |
| namespace Lucene.Net.Analysis.Icu.Segmentation |
| { |
| /* |
| * 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. |
| */ |
| |
| /// <summary> |
| /// Factory for <see cref="ICUTokenizer"/>. |
| /// Words are broken across script boundaries, then segmented according to |
| /// the <see cref="BreakIterator"/> and typing provided by the <see cref="DefaultICUTokenizerConfig"/>. |
| /// </summary> |
| /// <remarks> |
| /// To use the default set of per-script rules: |
| /// <code> |
| /// <fieldType name="text_icu" class="solr.TextField" positionIncrementGap="100"> |
| /// <analyzer> |
| /// <tokenizer class="solr.ICUTokenizerFactory"/> |
| /// </analyzer> |
| /// </fieldType> |
| /// </code> |
| /// <para/> |
| /// You can customize this tokenizer's behavior by specifying per-script rule files, |
| /// which are compiled by the ICU <see cref="RuleBasedBreakIterator"/>. See the |
| /// <a href="http://userguide.icu-project.org/boundaryanalysis#TOC-RBBI-Rules" |
| /// >ICU RuleBasedBreakIterator syntax reference</a>. |
| /// <para/> |
| /// To add per-script rules, add a "rulefiles" argument, which should contain a |
| /// comma-separated list of <c>code:rulefile</c> pairs in the following format: |
| /// <a href="http://unicode.org/iso15924/iso15924-codes.html" |
| /// >four-letter ISO 15924 script code</a>, followed by a colon, then a resource |
| /// path. E.g. to specify rules for Latin (script code "Latn") and Cyrillic |
| /// (script code "Cyrl"): |
| /// <code> |
| /// <fieldType name="text_icu_custom" class="solr.TextField" positionIncrementGap="100"> |
| /// <analyzer> |
| /// <tokenizer class="solr.ICUTokenizerFactory" cjkAsWords="true" |
| /// rulefiles="Latn:my.Latin.rules.rbbi,Cyrl:my.Cyrillic.rules.rbbi"/> |
| /// </analyzer> |
| /// </fieldType> |
| /// </code> |
| /// </remarks> |
| [ExceptionToClassNameConvention] |
| public class ICUTokenizerFactory : TokenizerFactory, IResourceLoaderAware |
| { |
| // SPI Name |
| //public const string NAME = "icu"; |
| |
| internal const string RULEFILES = "rulefiles"; |
| private readonly IDictionary<int, string> tailored; |
| private ICUTokenizerConfig config; |
| private readonly bool cjkAsWords; |
| private readonly bool myanmarAsWords; |
| |
| /// <summary>Creates a new <see cref="ICUTokenizerFactory"/>.</summary> |
| public ICUTokenizerFactory(IDictionary<string, string> args) |
| : base(args) |
| { |
| tailored = new Dictionary<int, string>(); |
| string rulefilesArg = Get(args, RULEFILES); |
| if (rulefilesArg != null) |
| { |
| IList<string> scriptAndResourcePaths = SplitFileNames(rulefilesArg); |
| foreach (string scriptAndResourcePath in scriptAndResourcePaths) |
| { |
| int colonPos = scriptAndResourcePath.IndexOf(':'); |
| string scriptCode = scriptAndResourcePath.Substring(0, colonPos - 0).Trim(); |
| string resourcePath = scriptAndResourcePath.Substring(colonPos + 1).Trim(); |
| tailored[UChar.GetPropertyValueEnum(UProperty.Script, scriptCode)] = resourcePath; |
| } |
| } |
| cjkAsWords = GetBoolean(args, "cjkAsWords", true); |
| myanmarAsWords = GetBoolean(args, "myanmarAsWords", true); |
| if (args.Count != 0) |
| { |
| throw new ArgumentException("Unknown parameters: " + args); |
| } |
| } |
| |
| public virtual void Inform(IResourceLoader loader) |
| { |
| if (Debugging.AssertsEnabled) Debugging.Assert(tailored != null, "init must be called first!"); |
| if (tailored.Count == 0) |
| { |
| config = new DefaultICUTokenizerConfig(cjkAsWords, myanmarAsWords); |
| } |
| else |
| { |
| config = new DefaultICUTokenizerConfigAnonymousHelper(cjkAsWords, myanmarAsWords, tailored, loader); |
| } |
| } |
| |
| private class DefaultICUTokenizerConfigAnonymousHelper : DefaultICUTokenizerConfig |
| { |
| private readonly BreakIterator[] breakers; |
| public DefaultICUTokenizerConfigAnonymousHelper(bool cjkAsWords, bool myanmarAsWords, IDictionary<int, string> tailored, IResourceLoader loader) |
| : base(cjkAsWords, myanmarAsWords) |
| { |
| breakers = new BreakIterator[1 + UChar.GetIntPropertyMaxValue(UProperty.Script)]; |
| foreach (var entry in tailored) |
| { |
| int code = entry.Key; |
| string resourcePath = entry.Value; |
| breakers[code] = ParseRules(resourcePath, loader); |
| } |
| } |
| |
| public override RuleBasedBreakIterator GetBreakIterator(int script) |
| { |
| if (breakers[script] != null) |
| { |
| return (RuleBasedBreakIterator)breakers[script].Clone(); |
| } |
| else |
| { |
| return base.GetBreakIterator(script); |
| } |
| } |
| |
| private BreakIterator ParseRules(string filename, IResourceLoader loader) |
| { |
| StringBuilder rules = new StringBuilder(); |
| Stream rulesStream = loader.OpenResource(filename); |
| using (TextReader reader = IOUtils.GetDecodingReader(rulesStream, Encoding.UTF8)) |
| { |
| string line = null; |
| while ((line = reader.ReadLine()) != null) |
| { |
| if (!line.StartsWith("#", StringComparison.Ordinal)) |
| { |
| rules.Append(line); |
| } |
| rules.Append('\n'); |
| } |
| } |
| return new RuleBasedBreakIterator(rules.ToString()); |
| } |
| } |
| |
| public override Tokenizer Create(AttributeSource.AttributeFactory factory, TextReader input) |
| { |
| if (Debugging.AssertsEnabled) Debugging.Assert(config != null, "inform must be called first!"); |
| return new ICUTokenizer(factory, input, config); |
| } |
| } |
| } |