1 files changed, 57 insertions, 0 deletions
diff --git a/src/core/Analysis/LetterTokenizer.cs b/src/core/Analysis/LetterTokenizer.cs
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+/* 
+ * 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 AttributeSource = Lucene.Net.Util.AttributeSource;
+
+namespace Lucene.Net.Analysis
+{
+	
+	/// <summary>A LetterTokenizer is a tokenizer that divides text at non-letters.  That's
+	/// to say, it defines tokens as maximal strings of adjacent letters, as defined
+	/// by java.lang.Character.isLetter() predicate.
+	/// Note: this does a decent job for most European languages, but does a terrible
+	/// job for some Asian languages, where words are not separated by spaces. 
+	/// </summary>
+	
+	public class LetterTokenizer:CharTokenizer
+	{
+		/// <summary>Construct a new LetterTokenizer. </summary>
+		public LetterTokenizer(System.IO.TextReader @in):base(@in)
+		{
+		}
+		
+		/// <summary>Construct a new LetterTokenizer using a given <see cref="AttributeSource" />. </summary>
+		public LetterTokenizer(AttributeSource source, System.IO.TextReader @in)
+			: base(source, @in)
+		{
+		}
+		
+		/// <summary>Construct a new LetterTokenizer using a given <see cref="Lucene.Net.Util.AttributeSource.AttributeFactory" />. </summary>
+		public LetterTokenizer(AttributeFactory factory, System.IO.TextReader @in)
+			: base(factory, @in)
+		{
+		}
+		
+		/// <summary>Collects only characters which satisfy
+		/// <see cref="char.IsLetter(char)" />.
+		/// </summary>
+		protected internal override bool IsTokenChar(char c)
+		{
+			return System.Char.IsLetter(c);
+		}
+	}
+}
+\ No newline at end of file