1 package org.apache.maven.doxia.module.twiki.parser;
2
3 /*
4 * Licensed to the Apache Software Foundation (ASF) under one
5 * or more contributor license agreements. See the NOTICE file
6 * distributed with this work for additional information
7 * regarding copyright ownership. The ASF licenses this file
8 * to you under the Apache License, Version 2.0 (the
9 * "License"); you may not use this file except in compliance
10 * with the License. You may obtain a copy of the License at
11 *
12 * http://www.apache.org/licenses/LICENSE-2.0
13 *
14 * Unless required by applicable law or agreed to in writing,
15 * software distributed under the License is distributed on an
16 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17 * KIND, either express or implied. See the License for the
18 * specific language governing permissions and limitations
19 * under the License.
20 */
21
22 import java.util.regex.Matcher;
23 import java.util.regex.Pattern;
24
25 import org.apache.maven.doxia.util.ByLineSource;
26 import org.apache.maven.doxia.parser.ParseException;
27
28 /**
29 * Block that represents an horizontal rule
30 *
31 * @author Juan F. Codagnone
32 * @version $Id: HRuleBlockParser.java 746991 2009-02-23 12:35:46Z vsiveton $
33 */
34 public class HRuleBlockParser
35 implements BlockParser
36 {
37 /**
38 * pattern used to detect horizontal rulers
39 */
40 private static final Pattern HRULE_PATTERN = Pattern.compile( "^(---)(-*)(.*)$" );
41
42 /** {@inheritDoc} */
43 public final boolean accept( final String line )
44 {
45 final Matcher m = HRULE_PATTERN.matcher( line );
46 boolean ret = false;
47
48 if ( m.lookingAt() )
49 {
50 final int textGroup = 3;
51 String s = m.group( textGroup );
52 if ( s != null && !s.startsWith( "+" ) )
53 {
54 ret = true;
55 }
56 }
57
58 return ret;
59 }
60
61 /**
62 * {@inheritDoc}
63 */
64 public final Block visit( final String line, final ByLineSource source )
65 throws ParseException
66 {
67 Block ret = new HorizontalRuleBlock();
68 final Matcher matcher = HRULE_PATTERN.matcher( line );
69 if ( matcher.lookingAt() )
70 {
71 final int textGroup = 3;
72 source.unget( matcher.group( textGroup ) );
73 }
74 else
75 {
76 throw new ParseException( "i was expecting a hruler!" );
77 }
78
79 return ret;
80 }
81 }