package org.apache.maven.doxia.module.twiki.parser;

 /*

  * 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.

  */

 import java.util.ArrayList;

 import java.util.List;

 import java.util.regex.Matcher;

 import java.util.regex.Pattern;

 import org.apache.maven.doxia.parser.ParseException;

 import org.apache.maven.doxia.util.ByLineSource;

 /**

  * Parse verbatim blocks

  *

  * @author Christian Nardi

  * @version $Id: VerbatimBlockParser.java 1090706 2011-04-09 23:15:28Z hboutemy $

  * @since 1.1

  */

 public class VerbatimBlockParser

     implements BlockParser

 {

     /**

      * pattern to detect verbatim start tags

      */

     private static final Pattern VERBATIM_START_PATTERN = Pattern.compile( "\\s*<verbatim>" );

     private static final Pattern VERBATIM_END_PATTERN = Pattern.compile( "</verbatim>" );

     /** {@inheritDoc} */

     public final boolean accept( final String line )

     {

         return VERBATIM_START_PATTERN.matcher( line ).lookingAt();

     }

     /**

      * {@inheritDoc}

      */

     public final Block visit( final String line, final ByLineSource source )

         throws ParseException

     {

         if ( !accept( line ) )

         {

             throw new IllegalAccessError( "call accept before this ;)" );

         }

         final List<Block> lines = new ArrayList<Block>();

         Matcher matcher = VERBATIM_START_PATTERN.matcher( line );

         matcher.find();

         String l = line.substring( matcher.end() );

         while ( l != null )

         {

             matcher = VERBATIM_END_PATTERN.matcher( l );

             if ( matcher.find() )

             {

                 lines.add( new TextBlock( l.substring( 0, matcher.start() ) + "\n" ) );

                 break;

             }

             lines.add( new TextBlock( l + "\n" ) );

             l = source.getNextLine();

         }

         return new VerbatimBlock( lines.toArray( new Block[] {} ) );

     }

 }