﻿/*
 * SonarAnalyzer for .NET
 * Copyright (C) 2015-2016 SonarSource SA
 * mailto:contact@sonarsource.com
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 3 of the License, 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
 */

using System.Collections.Generic;
using System.Linq;

namespace SonarAnalyzer.Helpers.FlowAnalysis.Common
{
    public abstract class EqualsSymbolicValue : EqualityLikeSymbolicValue
    {
        protected EqualsSymbolicValue(SymbolicValue leftOperand, SymbolicValue rightOperand)
            : base(leftOperand, rightOperand)
        {
        }

        internal override IEnumerable<ProgramState> SetConstraint(BoolConstraint boolConstraint,
            SymbolicValueConstraint leftConstraint, SymbolicValueConstraint rightConstraint,
            ProgramState programState)
        {
            if (boolConstraint == BoolConstraint.True)
            {
                return RightOperand.TrySetConstraint(leftConstraint, programState)
                    .SelectMany(ps => LeftOperand.TrySetConstraint(rightConstraint, ps));
            }

            return RightOperand.TrySetConstraint(leftConstraint?.OppositeForLogicalNot, programState)
                .SelectMany(ps => LeftOperand.TrySetConstraint(rightConstraint?.OppositeForLogicalNot, ps));
        }
    }
}
