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With inspiration from other libraries

There is a newer version: 2.12.15

/*
 * Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.
 * Use of this file is governed by the BSD 3-clause license that
 * can be found in the LICENSE.txt file in the project root.
 */

package org.antlr.v4.tool;

/** Defines behavior of object able to handle error messages from ANTLR including
 *  both tool errors like "can't write file" and grammar ambiguity warnings.
 *  To avoid having to change tools that use ANTLR (like GUIs), I am
 *  wrapping error data in Message objects and passing them to the listener.
 *  In this way, users of this interface are less sensitive to changes in
 *  the info I need for error messages.
 */
public interface ANTLRToolListener {
	public void info(String msg);
	public void error(ANTLRMessage msg);
	public void warning(ANTLRMessage msg);
}