View Javadoc

1   /***
2    *
3    * Copyright 2005 Jeremy Rayner
4    *
5    * Licensed under the Apache License, Version 2.0 (the "License");
6    * you may not use this file except in compliance with the License.
7    * You may obtain a copy of the License at
8    *
9    * http://www.apache.org/licenses/LICENSE-2.0
10   *
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   *
17   **/
18  package org.codehaus.groovy.antlr.treewalker;
19  
20  import java.io.PrintStream;
21  import org.codehaus.groovy.antlr.GroovySourceAST;
22  
23  /***
24   * A simple antlr AST visitor that outputs the tokenName of each node in a pseudo xml style.
25   *
26   * @author <a href="mailto:groovy@ross-rayner.com">Jeremy Rayner</a>
27   * @version $Revision: 1.1 $
28   */
29  
30  public class NodePrinter extends VisitorAdapter {
31      private String[] tokenNames;
32      private PrintStream out;
33  
34      /***
35       * A visitor that prints a pseudo xml output to the supplied PrintStream
36       * @param out supplied PrintStream to output nodes to
37       * @param tokenNames an array of token names to use
38       */
39      public NodePrinter(PrintStream out,String[] tokenNames) {
40          this.tokenNames = tokenNames;
41          this.out = out;
42      }
43  
44      public void visitDefault(GroovySourceAST t,int visit) {
45          if (visit == OPENING_VISIT) {
46              out.print("<"+ tokenNames[t.getType()] + ">");
47          } else {
48              out.print("</" + tokenNames[t.getType()] + ">");
49          }
50      }
51  
52  }