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//
// IntervalBase.cs
//
// Authors:
// Alexander Chebaturkin (chebaturkin@gmail.com)
//
// Copyright (C) 2012 Alexander Chebaturkin
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using System.IO;
using Mono.CodeContracts.Static.Lattices;
namespace Mono.CodeContracts.Static.Analysis.Numerical {
/// <summary>
/// Represents a generic class for intervals on numeric values.
/// </summary>
public abstract class IntervalBase<TInterval, TNumeric> : IAbstractDomain<TInterval>
where TInterval : IntervalBase<TInterval, TNumeric> {
protected IntervalBase (TNumeric lowerBound, TNumeric upperBound)
{
LowerBound = lowerBound;
UpperBound = upperBound;
}
public TNumeric UpperBound { get; protected set; }
public TNumeric LowerBound { get; protected set; }
public abstract TInterval Top { get; }
public abstract TInterval Bottom { get; }
public abstract bool IsTop { get; }
public abstract bool IsBottom { get; }
public bool IsSinglePoint { get { return this.IsNormal () && LowerBound.Equals (UpperBound); } }
public bool IsFinite { get { return this.IsNormal () && IsFiniteBound (LowerBound) && IsFiniteBound (UpperBound); } }
public abstract bool LessEqual (TInterval that);
public abstract TInterval Join (TInterval that, bool widening, out bool weaker);
public abstract TInterval Join (TInterval that);
public abstract TInterval Widen (TInterval that);
public abstract TInterval Meet (TInterval that);
public abstract TInterval ImmutableVersion ();
public abstract TInterval Clone ();
public abstract void Dump (TextWriter tw);
public override string ToString ()
{
return string.Format ("[{0}, {1}]{2}", LowerBound, UpperBound, this.BottomSymbolIfAny ());
}
protected abstract bool IsFiniteBound (TNumeric n);
}
}
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