antlr/Antlr4.Runtime/Atn/RuleTransition.cs

/*
 * [The "BSD license"]
 *  Copyright (c) 2013 Terence Parr
 *  Copyright (c) 2013 Sam Harwell
 *  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,
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 *  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
using Antlr4.Runtime.Atn;
using Antlr4.Runtime.Misc;
using Sharpen;

namespace Antlr4.Runtime.Atn
{
    public sealed class RuleTransition : Transition
    {
        /// <summary>Ptr to the rule definition object for this rule ref</summary>
        public readonly int ruleIndex;

        public readonly int precedence;

        /// <summary>What node to begin computations following ref to rule</summary>
        [NotNull]
        public ATNState followState;

        public bool tailCall;

        public bool optimizedTailCall;

        public RuleTransition(RuleStartState ruleStart, int ruleIndex, int precedence, ATNState
             followState) : base(ruleStart)
        {
            // no Rule object at runtime
            this.ruleIndex = ruleIndex;
            this.precedence = precedence;
            this.followState = followState;
        }

        public override int SerializationType
        {
            get
            {
                return Rule;
            }
        }

        public override bool IsEpsilon
        {
            get
            {
                return true;
            }
        }

        public override bool Matches(int symbol, int minVocabSymbol, int maxVocabSymbol)
        {
            return false;
        }
    }
}