1 package org.apache.maven.doxia.module.confluence.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 org.apache.maven.doxia.parser.ParseException;
23 import org.apache.maven.doxia.util.ByLineSource;
24
25 /**
26 * <p>ParagraphBlockParser class.</p>
27 *
28 * @version $Id: ParagraphBlockParser.java 775115 2009-05-15 12:54:18Z ltheussl $
29 */
30 public class ParagraphBlockParser
31 implements BlockParser
32 {
33 private BlockParser[] parsers;
34
35 /**
36 * <p>Constructor for ParagraphBlockParser.</p>
37 *
38 * @param parsers the parsers.
39 */
40 public ParagraphBlockParser( BlockParser[] parsers )
41 {
42 super();
43 this.parsers = parsers;
44 }
45
46 /** {@inheritDoc} */
47 public boolean accept( String line, ByLineSource source )
48 {
49 return true;
50 }
51
52 /**
53 * Visit the Block.
54 *
55 * @param line the line to visit.
56 * @param source the source.
57 * @param generateParagraphTags whether to generate a paragraph.
58 * @return the visited Block.
59 *
60 * @throws org.apache.maven.doxia.parser.ParseException if any
61 */
62 public Block visit( String line, ByLineSource source, boolean generateParagraphTags )
63 throws ParseException
64 {
65 if ( generateParagraphTags )
66 {
67 return this.visit( line, source );
68 }
69 else
70 {
71 ChildBlocksBuilder builder = new ChildBlocksBuilder( line );
72 return new ParagraphBlock( builder.getBlocks(), generateParagraphTags );
73 }
74 }
75
76 /** {@inheritDoc} */
77 public Block visit( String line, ByLineSource source )
78 throws ParseException
79 {
80
81 ChildBlocksBuilder builder = new ChildBlocksBuilder( appendUntilEmptyLine( line, source ) );
82 return new ParagraphBlock( builder.getBlocks() );
83 }
84
85 /**
86 * Slurp lines from the source starting with the given line appending them together into a StringBuffer until an
87 * empty line is reached, and while the source contains more lines. The result can be passed to the
88 * {@link #getBlocks(String)} method.
89 *
90 * @param line the first line
91 * @param source the source to read new lines from
92 * @return a StringBuffer appended with lines
93 * @throws ParseException
94 */
95 private String appendUntilEmptyLine( String line, ByLineSource source )
96 throws ParseException
97 {
98 StringBuffer text = new StringBuffer();
99
100 do
101 {
102
103 if ( line.trim().length() == 0 )
104 {
105 break;
106 }
107
108 boolean accepted = false;
109 for ( int i = 0; i < parsers.length; i++ )
110 {
111 BlockParser parser = parsers[i];
112 if ( parser.accept( line, source ) )
113 {
114 accepted = true;
115 break;
116 }
117 }
118 if ( accepted )
119 {
120 // Slightly fragile - if any of the parsers need to do this in order to decide whether to accept a line,
121 // then it will barf because of the contract of ByLineSource
122 source.ungetLine();
123 break;
124 }
125
126 if ( text.length() == 0 )
127 {
128 text.append( line.trim() );
129 }
130 else
131 {
132 text.append( " " + line.trim() );
133 }
134
135 }
136 while ( ( line = source.getNextLine() ) != null );
137
138 return text.toString();
139 }
140
141 }