InterpreterListener.java

package test.antlr.pie;
/***
 * Excerpted from "Language Implementation Patterns",
 * published by The Pragmatic Bookshelf.
 * Copyrights apply to this code. It may not be used to create training material, 
 * courses, books, articles, and the like. Contact us if you are in doubt.
 * We make no guarantees that this code is fit for any purpose. 
 * Visit http://www.pragmaticprogrammer.com/titles/tpdsl for more book information.
***/
import org.antlr.runtime.Token;

/** How to response to messages and errors from interpreter */
public interface InterpreterListener {
    public void info(String msg);
    public void error(String msg);
    public void error(String msg, Exception e);
    public void error(String msg, Token t);
}