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.regex.Matcher;
import java.util.regex.Pattern;
import org.apache.maven.doxia.util.ByLineSource;
import org.apache.maven.doxia.parser.ParseException;
/**
* Block that represents an horizontal rule
*
* @author Juan F. Codagnone
* @version $Id: HRuleBlockParser.java 746991 2009-02-23 12:35:46Z vsiveton $
*/
public class HRuleBlockParser
implements BlockParser
{
/**
* pattern used to detect horizontal rulers
*/
private static final Pattern HRULE_PATTERN = Pattern.compile( "^(---)(-*)(.*)$" );
/** {@inheritDoc} */
public final boolean accept( final String line )
{
final Matcher m = HRULE_PATTERN.matcher( line );
boolean ret = false;
if ( m.lookingAt() )
{
final int textGroup = 3;
String s = m.group( textGroup );
if ( s != null && !s.startsWith( "+" ) )
{
ret = true;
}
}
return ret;
}
/**
* {@inheritDoc}
*/
public final Block visit( final String line, final ByLineSource source )
throws ParseException
{
Block ret = new HorizontalRuleBlock();
final Matcher matcher = HRULE_PATTERN.matcher( line );
if ( matcher.lookingAt() )
{
final int textGroup = 3;
source.unget( matcher.group( textGroup ) );
}
else
{
throw new ParseException( "i was expecting a hruler!" );
}
return ret;
}
}