#region License
/* 
 * Copyright (C) 1999-2022 John Källén.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; see the file COPYING.  If not, write to
 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
 */
#endregion

using Reko.Core;
using Reko.Core.Expressions;

namespace Reko.Evaluation
{
    public class IdProcConstRule
    {
        private readonly EvaluationContext ctx;
        private Identifier? id;
        private ProcedureConstant? pc;

        public IdProcConstRule(EvaluationContext ctx)
        {
            this.ctx = ctx;
        }

        public bool Match(Identifier id)
        {
            this.id = id;
            this.pc = ctx.GetValue(id) as ProcedureConstant;
            return pc != null;
        }

        public ProcedureConstant Transform()
        {
            ctx.RemoveIdentifierUse(id!);
            return pc!;
        }
    }
}