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1   package org.apache.maven.doxia.module.twiki.parser;
2   
3   /*
4    * Licensed to the Apache Software Foundation (ASF) under one
5    * or more contributor license agreements.  See the NOTICE file
6    * distributed with this work for additional information
7    * regarding copyright ownership.  The ASF licenses this file
8    * to you under the Apache License, Version 2.0 (the
9    * "License"); you may not use this file except in compliance
10   * with the License.  You may obtain a copy of the License at
11   *
12   *   http://www.apache.org/licenses/LICENSE-2.0
13   *
14   * Unless required by applicable law or agreed to in writing,
15   * software distributed under the License is distributed on an
16   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17   * KIND, either express or implied.  See the License for the
18   * specific language governing permissions and limitations
19   * under the License.
20   */
21  
22  import java.util.ArrayList;
23  import java.util.List;
24  import java.util.regex.Matcher;
25  import java.util.regex.Pattern;
26  
27  import org.apache.maven.doxia.parser.ParseException;
28  import org.apache.maven.doxia.util.ByLineSource;
29  
30  /**
31   * Parse verbatim blocks
32   *
33   * @author Christian Nardi
34   * @version $Id: VerbatimBlockParser.java 1090706 2011-04-09 23:15:28Z hboutemy $
35   * @since 1.1
36   */
37  public class VerbatimBlockParser
38      implements BlockParser
39  {
40      /**
41       * pattern to detect verbatim start tags
42       */
43      private static final Pattern VERBATIM_START_PATTERN = Pattern.compile( "\\s*<verbatim>" );
44  
45      private static final Pattern VERBATIM_END_PATTERN = Pattern.compile( "</verbatim>" );
46  
47      /** {@inheritDoc} */
48      public final boolean accept( final String line )
49      {
50          return VERBATIM_START_PATTERN.matcher( line ).lookingAt();
51      }
52  
53      /**
54       * {@inheritDoc}
55       */
56      public final Block visit( final String line, final ByLineSource source )
57          throws ParseException
58      {
59          if ( !accept( line ) )
60          {
61              throw new IllegalAccessError( "call accept before this ;)" );
62          }
63  
64          final List<Block> lines = new ArrayList<Block>();
65          Matcher matcher = VERBATIM_START_PATTERN.matcher( line );
66          matcher.find();
67          String l = line.substring( matcher.end() );
68  
69          while ( l != null )
70          {
71              matcher = VERBATIM_END_PATTERN.matcher( l );
72              if ( matcher.find() )
73              {
74                  lines.add( new TextBlock( l.substring( 0, matcher.start() ) + "\n" ) );
75                  break;
76              }
77              lines.add( new TextBlock( l + "\n" ) );
78              l = source.getNextLine();
79          }
80  
81          return new VerbatimBlock( lines.toArray( new Block[] {} ) );
82      }
83  }