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.util.ByLineSource;
  import org.apache.maven.doxia.parser.ParseException;
  
  /**
   * Parse tables
   *
   * @author Juan F. Codagnone
   * @version $Id: TableBlockParser.java 1090706 2011-04-09 23:15:28Z hboutemy $
   */
  public class TableBlockParser
      implements BlockParser
  {
      /**
       * pattern to detect tables
       */
      private static final Pattern TABLE_PATTERN = Pattern.compile( "^\\s*([|].*[|])+\\s*$" );
  
      /**
       * text parser
       */
      private FormatedTextParser textParser;
  
      /** {@inheritDoc} */
      public final boolean accept( final String line )
      {
          return TABLE_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> rows = new ArrayList<Block>();
          String l = line;
  
          do
          {
              final Matcher m = TABLE_PATTERN.matcher( l );
              if ( m.lookingAt() )
              {
                  final List<Block> cells = new ArrayList<Block>();
  
                  /* for each cell... */
                  for ( int lh = l.indexOf( '|' ) + 1, rh; ( rh = l.indexOf( '|', lh ) ) != -1; lh = rh + 1 )
                  {
                      final Block[] bs = textParser.parse( l.substring( lh, rh ).trim() );
                      if ( bs.length == 1 && bs[0] instanceof BoldBlock )
                      {
                          final Block[] tmp = ( (BoldBlock) bs[0] ).getBlocks();
                          cells.add( new TableCellHeaderBlock( tmp ) );
                      }
                      else
                      {
                          cells.add( new TableCellBlock( bs ) );
                      }
                  }
                  rows.add( new TableRowBlock( (Block[]) cells.toArray( new Block[] {} ) ) );
              }
  
          }
          while ( ( l = source.getNextLine() ) != null && accept( l ) );
  
          assert rows.size() >= 1;
  
          return new TableBlock( rows.toArray( new Block[] {} ) );
      }
 
     /**
      * <p>Setter for the field <code>textParser</code>.</p>
      *
      * @param textParser text parser to be set
      */
     public final void setTextParser( final FormatedTextParser textParser )
     {
         if ( textParser == null )
         {
             throw new IllegalArgumentException( "argument can't be null" );
         }
 
         this.textParser = textParser;
     }
 }