package org.apache.maven.doxia.module.confluence.parser.table;
   
   /*
    * 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.io.StringReader;
  import java.util.ArrayList;
  import java.util.LinkedList;
  import java.util.List;
  
  import org.apache.maven.doxia.module.confluence.ConfluenceMarkup;
  import org.apache.maven.doxia.module.confluence.parser.Block;
  import org.apache.maven.doxia.module.confluence.parser.BlockParser;
  import org.apache.maven.doxia.module.confluence.parser.BoldBlock;
  import org.apache.maven.doxia.module.confluence.parser.FigureBlockParser;
  import org.apache.maven.doxia.module.confluence.parser.ParagraphBlockParser;
  import org.apache.maven.doxia.module.confluence.parser.SectionBlockParser;
  import org.apache.maven.doxia.module.confluence.parser.list.ListBlockParser;
  import org.apache.maven.doxia.parser.ParseException;
  import org.apache.maven.doxia.util.ByLineReaderSource;
  import org.apache.maven.doxia.util.ByLineSource;
  import org.codehaus.plexus.util.StringUtils;
  
  /**
   * Parse tables
   *
   * @author Juan F. Codagnone
   */
  public class TableBlockParser
      implements BlockParser
  {
      private static final String EMPTY_STRING = "";
  
      private static final String ANY_CHARACTER = ".*";
  
      private static final String ESCAPE_CHARACTER = "\\";
  
      private BlockParser[] parsers;
  
      /**
       * Default constructor TableBlockParser.
       */
      public TableBlockParser()
      {
          BlockParser headingParser = new SectionBlockParser();
          BlockParser figureParser = new FigureBlockParser();
          BlockParser listParser = new ListBlockParser();
  
          BlockParser[] subparsers = new BlockParser[] { headingParser, figureParser, listParser };
          BlockParser paragraphParser = new ParagraphBlockParser( subparsers );
  
          this.parsers = new BlockParser[] { headingParser, figureParser, listParser, paragraphParser };
  
      }
  
      /** {@inheritDoc} */
      public boolean accept( String line, ByLineSource source )
      {
          return line.startsWith( "|" );
      }
  
      /** {@inheritDoc} */
      public Block visit( String line, ByLineSource source )
          throws ParseException
      {
          if ( !accept( line, source ) )
          {
              throw new IllegalAccessError( "call accept before this ;)" );
          }
  
          List<Block> rows = new ArrayList<>();
  
          String l = line;
  
          do
          {
              l = l.substring( 0, l.lastIndexOf( "|" ) );
  
              List<Block> cells = new ArrayList<>();
  
              if ( l.startsWith( "||" ) )
              {
                  String[] text = StringUtils.split( l, "||" );
 
                 for ( String s : text )
                 {
                     List<Block> textBlocks = new ArrayList<>();
 
                     textBlocks.add( parseLine( s, new ByLineReaderSource( new StringReader( EMPTY_STRING ) ) ) );
 
                     List<Block> blocks = new ArrayList<>();
 
                     blocks.add( new BoldBlock( textBlocks ) );
 
                     cells.add( new TableCellHeaderBlock( blocks ) );
                 }
             }
             else
             {
                 int it = 0;
                 String[] text = StringUtils.split( l, "|" );
                 List<String> texts = new LinkedList<>();
 
                 while ( it < text.length )
                 {
                     if ( text[it].matches( ANY_CHARACTER + ESCAPE_CHARACTER + ConfluenceMarkup.LINK_START_MARKUP
                         + ANY_CHARACTER )
                         && !text[it].matches( ANY_CHARACTER + ESCAPE_CHARACTER + ConfluenceMarkup.LINK_END_MARKUP
                             + ANY_CHARACTER ) )
                     {
                         texts.add( text[it] + ConfluenceMarkup.TABLE_CELL_MARKUP + text[it + 1] );
                         it += 2;
                         continue;
                     }
                     texts.add( text[it] );
                     it++;
                 }
 
                 for ( String pText : texts )
                 {
                     List<Block> blocks = new ArrayList<>();
 
                     blocks.add( parseLine( pText, new ByLineReaderSource( new StringReader( EMPTY_STRING ) ) ) );
 
                     cells.add( new TableCellBlock( blocks ) );
                 }
             }
 
             rows.add( new TableRowBlock( cells ) );
         }
         while ( ( l = source.getNextLine() ) != null && accept( l, source ) );
 
         assert rows.size() >= 1;
 
         return new TableBlock( rows );
     }
 
     private Block parseLine( String text, ByLineSource source )
         throws ParseException
     {
         if ( text.length() > 0 )
         {
             for ( BlockParser parser : parsers )
             {
                 if ( parser.accept( text, source ) )
                 {
                     if ( parser instanceof ParagraphBlockParser )
                     {
                         return ( (ParagraphBlockParser) parser ).visit( text, source, false );
                     }
                     else
                     {
                         return parser.visit( text, source );
                     }
                 }
             }
         }
         return null;
     }
 }