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
22 import org.codehaus.groovy.antlr.GroovySourceAST;
23
24 /***
25 * A simple antlr AST visitor that outputs the tokenName of each node in a pseudo xml style.
26 *
27 * @author <a href="mailto:groovy@ross-rayner.com">Jeremy Rayner</a>
28 * @version $Revision: 4032 $
29 */
30
31 public class NodePrinter extends VisitorAdapter {
32 private String[] tokenNames;
33 private PrintStream out;
34
35 /***
36 * A visitor that prints a pseudo xml output to the supplied PrintStream
37 * @param out supplied PrintStream to output nodes to
38 * @param tokenNames an array of token names to use
39 */
40 public NodePrinter(PrintStream out,String[] tokenNames) {
41 this.tokenNames = tokenNames;
42 this.out = out;
43 }
44
45 public void visitDefault(GroovySourceAST t,int visit) {
46 if (visit == OPENING_VISIT) {
47 out.print("<"+ tokenNames[t.getType()] + ">");
48 } else {
49 out.print("</" + tokenNames[t.getType()] + ">");
50 }
51 }
52 }