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


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.SimpleNode;
34
35 public abstract class BeginEndTagParser implements Parser
36 {
37     private String JavaDoc parsableString;
38     private EscapedString data;
39     private int currentOffset = 0;
40     private int line = -1;
41
42     String JavaDoc startKeyword, endKeyword;
43
44     private boolean started = false;
45
46     /**
47      * Constructor for WikiLinkParser.
48      */
49     public BeginEndTagParser(String JavaDoc startKeyword, String JavaDoc endKeyword)
50     {
51         this.startKeyword = startKeyword;
52         this.endKeyword = endKeyword;
53     }
54
55     /*public BeginEndTagParser()
56     {
57         this("{", "}");
58     }*/
59
60     private void setParsableString(String JavaDoc inParsableString)
61     {
62         parsableString = inParsableString;
63         data = new EscapedString(parsableString);
64         currentOffset = 0;
65     }
66
67     public void setSource(Object JavaDoc o)
68     {
69         if (o instanceof String JavaDoc)
70             setParsableString((String JavaDoc)o);
71         else if (o.getClass() == SimpleNode.class || o.getClass() == LineNode.class)
72         {
73             setParsableString(((AbstractNode)o).getText());
74             line = ((AbstractNode)o).getLineNumber();
75         }
76         else
77             throw new IllegalArgumentException JavaDoc("unsupported type "+o.getClass());
78     }
79
80     public boolean hasMore()
81     {
82         if (parsableString == null)
83             return false;
84
85         return currentOffset < parsableString.length();
86     }
87
88     public Node next()
89     {
90         if (currentOffset >= data.length())
91             throw new IllegalStateException JavaDoc("past end");
92
93         Node n = null;
94
95         int foo = -1;
96         foo = data.indexOf(started? endKeyword : startKeyword, currentOffset);
97
98
99         if (foo != -1)
100         {
101             if (started)
102                 n = createNode(parsableString.substring(currentOffset+startKeyword.length()-1, foo), line, currentOffset, foo-1);
103             else
104                 n = new SimpleNode(parsableString.substring(currentOffset, foo), line, currentOffset, foo);
105
106             started = !started;
107         }
108         else
109         {
110             // if (started) Error: non-ended tag
111 foo = parsableString.length();
112             n = new SimpleNode(parsableString.substring(currentOffset, foo), -1, currentOffset, foo);
113         }
114
115         currentOffset = foo+1;
116
117         return n;
118     }
119
120     protected abstract Node createNode(String JavaDoc contents, int line, int startIndex, int endIndex);
121
122     public static void main(String JavaDoc args[])
123     {
124         WikiLinkParser parser = new WikiLinkParser();
125         parser.setSource("hafaaj[fja][\\]\\]]]]");
126
127         while (parser.hasMore() == true)
128         {
129             Node n = parser.next();
130             System.out.println(n.getClass().toString()+": "+n.toString());
131         }
132     }
133 }
134
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