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 */
33 public class HRuleBlockParser
34 implements BlockParser
35 {
36 /**
37 * pattern used to detect horizontal rulers
38 */
39 private static final Pattern HRULE_PATTERN = Pattern.compile( "^(---)(-*)(.*)$" );
40
41 /** {@inheritDoc} */
42 public final boolean accept( final String line )
43 {
44 final Matcher m = HRULE_PATTERN.matcher( line );
45 boolean ret = false;
46
47 if ( m.lookingAt() )
48 {
49 final int textGroup = 3;
50 String s = m.group( textGroup );
51 if ( s != null && !s.startsWith( "+" ) )
52 {
53 ret = true;
54 }
55 }
56
57 return ret;
58 }
59
60 /** {@inheritDoc} */
61 public final Block visit( final String line, final ByLineSource source )
62 throws ParseException
63 {
64 Block ret = new HorizontalRuleBlock();
65 final Matcher matcher = HRULE_PATTERN.matcher( line );
66 if ( matcher.lookingAt() )
67 {
68 final int textGroup = 3;
69 source.unget( matcher.group( textGroup ) );
70 }
71 else
72 {
73 throw new ParseException( "i was expecting a hruler!" );
74 }
75
76 return ret;
77 }
78 }