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Java Lookahead Parser Generator. Generator produces LALR(k) parsers. Grammar rules are entered using annotations. Rule annotation can be attached to reducer method, which keeps rule and it's action together.

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package org.vesalainen.grammar;

public class Nil extends Nonterminal
{

    public Nil()
    {
        super(4, "Nil");
    }

    @Override
    public boolean isNil()
    {
        return true;
    }
}