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Java > Open Source Codes > polyglot > ast > Ext


1 package polyglot.ast;
2
3 import polyglot.util.CodeWriter;
4 import polyglot.util.Copy;
5
6 /**
7  * <code>Ext</code> is the super type of all node extension objects.
8  * It contains a pointer back to the node it is extending and a possibly-null
9  * pointer to another extension node.
10  */
11 public interface Ext extends Copy
12 {
13     /** The node that we are extending. */
14     Node node();
15
16     /**
17      * Initialize the extension object's pointer back to the node.
18      * This also initializes the back pointers for all extensions of
19      * the extension.
20      */
21     void init(Node node);
22
23     /** An extension of this extension, or null. */
24     Ext ext();
25
26     /** Set the extension of this extension. */
27     Ext ext(Ext ext);
28
29     /**
30      * Dump the AST node for debugging purposes.
31      */
32     void dump(CodeWriter w);
33 }
34
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