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The ANTLR 3 tool.
There is a newer version: 3.5.3
/*
 * [The "BSD license"]
 *  Copyright (c) 2010 Terence Parr
 *  All rights reserved.
 *
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions
 *  are met:
 *  1. Redistributions of source code must retain the above copyright
 *      notice, this list of conditions and the following disclaimer.
 *  2. Redistributions in binary form must reproduce the above copyright
 *      notice, this list of conditions and the following disclaimer in the
 *      documentation and/or other materials provided with the distribution.
 *  3. The name of the author may not be used to endorse or promote products
 *      derived from this software without specific prior written permission.
 *
 *  THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 *  IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 *  OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 *  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 *  NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 *  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 *  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package org.antlr.tool;

import org.antlr.analysis.DFAState;
import org.antlr.analysis.DecisionProbe;
import org.antlr.analysis.Label;
import org.stringtemplate.v4.ST;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

/** Reports a potential parsing issue with a decision; the decision is
 *  nondeterministic in some way.
 */
public class GrammarDanglingStateMessage extends Message {
	public DecisionProbe probe;
	public DFAState problemState;

	public GrammarDanglingStateMessage(DecisionProbe probe,
									   DFAState problemState)
	{
		super(ErrorManager.MSG_DANGLING_STATE);
		this.probe = probe;
		this.problemState = problemState;
	}

	@Override
	public String toString() {
		GrammarAST decisionASTNode = probe.dfa.getDecisionASTNode();
		line = decisionASTNode.getLine();
		column = decisionASTNode.getCharPositionInLine();
		String fileName = probe.dfa.nfa.grammar.getFileName();
		if ( fileName!=null ) {
			file = fileName;
		}
		List labels = probe.getSampleNonDeterministicInputSequence(problemState);
		String input = probe.getInputSequenceDisplay(labels);
		ST st = getMessageTemplate();
		List alts = new ArrayList();
		alts.addAll(problemState.getAltSet());
		Collections.sort(alts);
		st.add("danglingAlts", alts);
		st.add("input", input);

		return super.toString(st);
	}

}