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 */
035public class TableBlockParser
036    implements BlockParser
037{
038    /**
039     * pattern to detect tables
040     */
041    private static final Pattern TABLE_PATTERN = Pattern.compile( "^\\s*([|].*[|])+\\s*$" );
042
043    /**
044     * text parser
045     */
046    private FormatedTextParser textParser;
047
048    /** {@inheritDoc} */
049    public final boolean accept( final String line )
050    {
051        return TABLE_PATTERN.matcher( line ).lookingAt();
052    }
053
054    /** {@inheritDoc} */
055    public final Block visit( final String line, final ByLineSource source )
056        throws ParseException
057    {
058        if ( !accept( line ) )
059        {
060            throw new IllegalAccessError( "call accept before this ;)" );
061        }
062
063        final List<Block> rows = new ArrayList<>();
064        String l = line;
065
066        do
067        {
068            final Matcher m = TABLE_PATTERN.matcher( l );
069            if ( m.lookingAt() )
070            {
071                final List<Block> cells = new ArrayList<>();
072
073                /* for each cell... */
074                for ( int lh = l.indexOf( '|' ) + 1, rh; ( rh = l.indexOf( '|', lh ) ) != -1; lh = rh + 1 )
075                {
076                    final Block[] bs = textParser.parse( l.substring( lh, rh ).trim() );
077                    if ( bs.length == 1 && bs[0] instanceof BoldBlock )
078                    {
079                        final Block[] tmp = ( (BoldBlock) bs[0] ).getBlocks();
080                        cells.add( new TableCellHeaderBlock( tmp ) );
081                    }
082                    else
083                    {
084                        cells.add( new TableCellBlock( bs ) );
085                    }
086                }
087                rows.add( new TableRowBlock( cells.toArray( new Block[] {} ) ) );
088            }
089
090        }
091        while ( ( l = source.getNextLine() ) != null && accept( l ) );
092
093        assert rows.size() >= 1;
094
095        return new TableBlock( rows.toArray( new Block[] {} ) );
096    }
097
098    /**
099     * <p>Setter for the field <code>textParser</code>.</p>
100     *
101     * @param textParser text parser to be set
102     */
103    public final void setTextParser( final FormatedTextParser textParser )
104    {
105        if ( textParser == null )
106        {
107            throw new IllegalArgumentException( "argument can't be null" );
108        }
109
110        this.textParser = textParser;
111    }
112}