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Java > Open Source Codes > net > killingar > wiki > parser > WikiLinkParser


1     /* Copyright 2000-2005 Anders Hovmöller
2  *
3  * The person or persons who have associated their work with
4  * this document (the "Dedicator") hereby dedicate the entire
5  * copyright in the work of authorship identified below (the
6  * "Work") to the public domain.
7  *
8  * Dedicator makes this dedication for the benefit of the
9  * public at large and to the detriment of Dedicator's heirs
10  * and successors. Dedicator intends this dedication to be an
11  * overt act of relinquishment in perpetuity of all present
12  * and future rights under copyright law, whether vested or
13  * contingent, in the Work. Dedicator understands that such
14  * relinquishment of all rights includes the relinquishment of
15  * all rights to enforce (by lawsuit or otherwise) those
16  * copyrights in the Work.
17  *
18  * Dedicator recognizes that, once placed in the public
19  * domain, the Work may be freely reproduced, distributed,
20  * transmitted, used, modified, built upon, or otherwise
21  * exploited by anyone for any purpose, commercial or non-
22  * commercial, and in any way, including by methods that have
23  * not yet been invented or conceived.
24  */
25
26 package net.killingar.wiki.parser;
27
28 import net.killingar.EscapedString;
29 import net.killingar.wiki.Node;
30 import net.killingar.wiki.Parser;
31 import net.killingar.wiki.impl.AbstractNode;
32 import net.killingar.wiki.impl.LineNode;
33 import net.killingar.wiki.impl.LinkNode;
34 import net.killingar.wiki.impl.SimpleNode;
35
36 public class WikiLinkParser implements Parser
37 {
38     private String JavaDoc parsableString;
39     private EscapedString data;
40     private int currentOffset = 0;
41     private int line = -1;
42
43     char startKeyword, endKeyword;
44
45     private boolean started = false;
46
47     /**
48      * Constructor for WikiLinkParser.
49      */
50     public WikiLinkParser(char startKeyword, char endKeyword)
51     {
52         this.startKeyword = startKeyword;
53         this.endKeyword = endKeyword;
54     }
55
56     public WikiLinkParser()
57     {
58         this('[', ']');
59     }
60
61     private void setParsableString(String JavaDoc inParsableString)
62     {
63         parsableString = inParsableString;
64         data = new EscapedString(parsableString);
65         currentOffset = 0;
66     }
67
68     public void setSource(Object JavaDoc o)
69     {
70         if (o instanceof String JavaDoc)
71             setParsableString((String JavaDoc)o);
72         else if (o.getClass() == SimpleNode.class || o.getClass() == LineNode.class)
73         {
74             setParsableString(((AbstractNode)o).getText());
75             line = ((AbstractNode)o).getLineNumber();
76         }
77         else
78             throw new IllegalArgumentException JavaDoc("unsupported type "+o.getClass());
79     }
80
81     public boolean hasMore()
82     {
83         if (parsableString == null)
84             return false;
85
86         return currentOffset < parsableString.length();
87     }
88
89     public Node next()
90     {
91         if (currentOffset >= data.length())
92             throw new IllegalStateException JavaDoc("past end");
93
94         Node n = null;
95
96         int foo = -1;
97         foo = data.indexOf(started? endKeyword : startKeyword, currentOffset);
98
99
100         if (foo != -1)
101         {
102             if (started)
103                 n = createNode(parsableString.substring(currentOffset, foo), line, currentOffset, foo-1);
104             else
105                 n = new SimpleNode(parsableString.substring(currentOffset, foo), line, currentOffset, foo);
106
107             started = !started;
108         }
109         else
110         {
111             // if (started) Error: non-ended tag
112 foo = parsableString.length();
113             n = new SimpleNode(parsableString.substring(currentOffset, foo), -1, currentOffset, foo);
114         }
115
116         currentOffset = foo+1;
117
118         return n;
119     }
120
121     protected Node createNode(String JavaDoc contents, int line, int startIndex, int endIndex)
122     {
123         return new LinkNode(contents, line, startIndex, endIndex);
124     }
125
126     public static void main(String JavaDoc args[])
127     {
128         WikiLinkParser parser = new WikiLinkParser();
129         parser.setSource("foo \\[bar] asd");
130
131         while (parser.hasMore() == true)
132         {
133             Node n = parser.next();
134             System.out.println(n.getClass().toString()+": "+n.toString());
135         }
136     }
137 }
138
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