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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.automata;

import org.antlr.v4.runtime.atn.ATNState;
import org.antlr.v4.runtime.atn.Transition;

import java.util.HashSet;
import java.util.Set;

/** A simple visitor that walks everywhere it can go starting from s,
 *  without going into an infinite cycle. Override and implement
 *  visitState() to provide functionality.
 */
public class ATNVisitor {
	public void visit(ATNState s) {
		visit_(s, new HashSet());
	}

	public void visit_(ATNState s, Set visited) {
		if ( !visited.add(s.stateNumber) ) return;
		visited.add(s.stateNumber);

		visitState(s);
		int n = s.getNumberOfTransitions();
		for (int i=0; i