001package org.apache.maven.doxia.module.twiki.parser;
002
003/*
004 * Licensed to the Apache Software Foundation (ASF) under one
005 * or more contributor license agreements.  See the NOTICE file
006 * distributed with this work for additional information
007 * regarding copyright ownership.  The ASF licenses this file
008 * to you under the Apache License, Version 2.0 (the
009 * "License"); you may not use this file except in compliance
010 * with the License.  You may obtain a copy of the License at
011 *
012 *   http://www.apache.org/licenses/LICENSE-2.0
013 *
014 * Unless required by applicable law or agreed to in writing,
015 * software distributed under the License is distributed on an
016 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
017 * KIND, either express or implied.  See the License for the
018 * specific language governing permissions and limitations
019 * under the License.
020 */
021
022import java.util.ArrayList;
023import java.util.List;
024import java.util.regex.Matcher;
025import java.util.regex.Pattern;
026
027import org.apache.maven.doxia.util.ByLineSource;
028import org.apache.maven.doxia.parser.ParseException;
029
030/**
031 * Parse tables
032 *
033 * @author Juan F. Codagnone
034 * @version $Id: TableBlockParser.html 905940 2014-04-12 16:27:29Z hboutemy $
035 */
036public class TableBlockParser
037    implements BlockParser
038{
039    /**
040     * pattern to detect tables
041     */
042    private static final Pattern TABLE_PATTERN = Pattern.compile( "^\\s*([|].*[|])+\\s*$" );
043
044    /**
045     * text parser
046     */
047    private FormatedTextParser textParser;
048
049    /** {@inheritDoc} */
050    public final boolean accept( final String line )
051    {
052        return TABLE_PATTERN.matcher( line ).lookingAt();
053    }
054
055    /**
056     * {@inheritDoc}
057     */
058    public final Block visit( final String line, final ByLineSource source )
059        throws ParseException
060    {
061        if ( !accept( line ) )
062        {
063            throw new IllegalAccessError( "call accept before this ;)" );
064        }
065
066        final List<Block> rows = new ArrayList<Block>();
067        String l = line;
068
069        do
070        {
071            final Matcher m = TABLE_PATTERN.matcher( l );
072            if ( m.lookingAt() )
073            {
074                final List<Block> cells = new ArrayList<Block>();
075
076                /* for each cell... */
077                for ( int lh = l.indexOf( '|' ) + 1, rh; ( rh = l.indexOf( '|', lh ) ) != -1; lh = rh + 1 )
078                {
079                    final Block[] bs = textParser.parse( l.substring( lh, rh ).trim() );
080                    if ( bs.length == 1 && bs[0] instanceof BoldBlock )
081                    {
082                        final Block[] tmp = ( (BoldBlock) bs[0] ).getBlocks();
083                        cells.add( new TableCellHeaderBlock( tmp ) );
084                    }
085                    else
086                    {
087                        cells.add( new TableCellBlock( bs ) );
088                    }
089                }
090                rows.add( new TableRowBlock( (Block[]) cells.toArray( new Block[] {} ) ) );
091            }
092
093        }
094        while ( ( l = source.getNextLine() ) != null && accept( l ) );
095
096        assert rows.size() >= 1;
097
098        return new TableBlock( rows.toArray( new Block[] {} ) );
099    }
100
101    /**
102     * <p>Setter for the field <code>textParser</code>.</p>
103     *
104     * @param textParser text parser to be set
105     */
106    public final void setTextParser( final FormatedTextParser textParser )
107    {
108        if ( textParser == null )
109        {
110            throw new IllegalArgumentException( "argument can't be null" );
111        }
112
113        this.textParser = textParser;
114    }
115}