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 */ 033public class HRuleBlockParser 034 implements BlockParser 035{ 036 /** 037 * pattern used to detect horizontal rulers 038 */ 039 private static final Pattern HRULE_PATTERN = Pattern.compile( "^(---)(-*)(.*)$" ); 040 041 /** {@inheritDoc} */ 042 public final boolean accept( final String line ) 043 { 044 final Matcher m = HRULE_PATTERN.matcher( line ); 045 boolean ret = false; 046 047 if ( m.lookingAt() ) 048 { 049 final int textGroup = 3; 050 String s = m.group( textGroup ); 051 if ( s != null && !s.startsWith( "+" ) ) 052 { 053 ret = true; 054 } 055 } 056 057 return ret; 058 } 059 060 /** {@inheritDoc} */ 061 public final Block visit( final String line, final ByLineSource source ) 062 throws ParseException 063 { 064 Block ret = new HorizontalRuleBlock(); 065 final Matcher matcher = HRULE_PATTERN.matcher( line ); 066 if ( matcher.lookingAt() ) 067 { 068 final int textGroup = 3; 069 source.unget( matcher.group( textGroup ) ); 070 } 071 else 072 { 073 throw new ParseException( "i was expecting a hruler!" ); 074 } 075 076 return ret; 077 } 078}