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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.codegen.model;

import org.antlr.v4.codegen.OutputModelFactory;
import org.antlr.v4.runtime.atn.PlusBlockStartState;
import org.antlr.v4.runtime.atn.PlusLoopbackState;
import org.antlr.v4.tool.ast.BlockAST;
import org.antlr.v4.tool.ast.GrammarAST;

import java.util.List;

public class PlusBlock extends Loop {
	@ModelElement public ThrowNoViableAlt error;

	public PlusBlock(OutputModelFactory factory,
					 GrammarAST plusRoot,
					 List alts)
	{
		super(factory, plusRoot, alts);
		BlockAST blkAST = (BlockAST)plusRoot.getChild(0);
		PlusBlockStartState blkStart = (PlusBlockStartState)blkAST.atnState;
		PlusLoopbackState loop = blkStart.loopBackState;
		stateNumber = blkStart.loopBackState.stateNumber;
		blockStartStateNumber = blkStart.stateNumber;
		loopBackStateNumber = loop.stateNumber;
		this.error = getThrowNoViableAlt(factory, plusRoot, null);
		decision = loop.decision;
	}
}