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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.runtime.atn;

import org.antlr.v4.runtime.misc.IntervalSet;

public final class RangeTransition extends Transition {
	public final int from;
	public final int to;

	public RangeTransition(ATNState target, int from, int to) {
		super(target);
		this.from = from;
		this.to = to;
	}

	@Override
	public int getSerializationType() {
		return RANGE;
	}

	@Override

	public IntervalSet label() { return IntervalSet.of(from, to); }

	@Override
	public boolean matches(int symbol, int minVocabSymbol, int maxVocabSymbol) {
		return symbol >= from && symbol <= to;
	}

	@Override
	public String toString() {
		return new StringBuilder("'")
				.appendCodePoint(from)
				.append("'..'")
				.appendCodePoint(to)
				.append("'")
				.toString();
	}
}