Visitor


1   package org.python.parser;
2   
3   import org.python.parser.ast.*;
4   
5   public class Visitor extends VisitorBase {
6   
7       /**
8        * Visit each of the children one by one.
9        * @args node The node whose children will be visited.
10       */
11      public void traverse(SimpleNode node) throws Exception   {
12          node.traverse(this);
13      }
14  
15  
16      public void visit(SimpleNode[] nodes) throws Exception   {
17          for (int i = 0; i < nodes.length; i++) {
18              visit(nodes[i]);
19          }
20      }
21  
22      /**
23       * Visit the node by calling a visitXXX method.
24       */
25      public Object   visit(SimpleNode node) throws Exception   {
26          open_level(node);
27          Object   ret = node.accept(this);
28          close_level(node);
29          return ret;
30      }
31  
32  
33      protected Object   unhandled_node(SimpleNode node) throws Exception   {
34          return this;
35      }
36  
37      protected void open_level(SimpleNode node) throws Exception   {
38      }
39  
40      protected void close_level(SimpleNode node) throws Exception   {
41      }
42  }
43

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