| using System.IO; |
| |
| namespace Lucene.Net.Analysis.Fa |
| { |
| /* |
| * 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> |
| /// <see cref="CharFilter"/> that replaces instances of Zero-width non-joiner with an |
| /// ordinary space. |
| /// </summary> |
| public class PersianCharFilter : CharFilter |
| { |
| public PersianCharFilter(TextReader @in) |
| : base(@in) |
| { |
| } |
| |
| public override int Read(char[] cbuf, int off, int len) |
| { |
| int charsRead = m_input.Read(cbuf, off, len); |
| if (charsRead > 0) |
| { |
| int end = off + charsRead; |
| while (off < end) |
| { |
| if (cbuf[off] == '\u200C') |
| { |
| cbuf[off] = ' '; |
| } |
| off++; |
| } |
| } |
| return charsRead; |
| } |
| |
| // optimized impl: some other charfilters consume with read() |
| public override int Read() |
| { |
| int ch = m_input.Read(); |
| if (ch == '\u200C') |
| { |
| return ' '; |
| } |
| else |
| { |
| return ch; |
| } |
| } |
| protected override int Correct(int currentOff) |
| { |
| return currentOff; // we don't change the length of the string |
| } |
| } |
| } |