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.regex.Matcher; 023import java.util.regex.Pattern; 024 025import org.apache.maven.doxia.util.ByLineSource; 026import org.apache.maven.doxia.parser.ParseException; 027 028/** 029 * Block that represents an horizontal rule 030 * 031 * @author Juan F. Codagnone 032 * @version $Id: HRuleBlockParser.html 905940 2014-04-12 16:27:29Z hboutemy $ 033 */ 034public class HRuleBlockParser 035 implements BlockParser 036{ 037 /** 038 * pattern used to detect horizontal rulers 039 */ 040 private static final Pattern HRULE_PATTERN = Pattern.compile( "^(---)(-*)(.*)$" ); 041 042 /** {@inheritDoc} */ 043 public final boolean accept( final String line ) 044 { 045 final Matcher m = HRULE_PATTERN.matcher( line ); 046 boolean ret = false; 047 048 if ( m.lookingAt() ) 049 { 050 final int textGroup = 3; 051 String s = m.group( textGroup ); 052 if ( s != null && !s.startsWith( "+" ) ) 053 { 054 ret = true; 055 } 056 } 057 058 return ret; 059 } 060 061 /** 062 * {@inheritDoc} 063 */ 064 public final Block visit( final String line, final ByLineSource source ) 065 throws ParseException 066 { 067 Block ret = new HorizontalRuleBlock(); 068 final Matcher matcher = HRULE_PATTERN.matcher( line ); 069 if ( matcher.lookingAt() ) 070 { 071 final int textGroup = 3; 072 source.unget( matcher.group( textGroup ) ); 073 } 074 else 075 { 076 throw new ParseException( "i was expecting a hruler!" ); 077 } 078 079 return ret; 080 } 081}