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//
// IntervalContext.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 Mono.CodeContracts.Static.Lattices;
namespace Mono.CodeContracts.Static.Analysis.Numerical {
class IntervalContext : IntervalRationalContextBase<Interval> {
public static readonly IntervalContext Instance = new IntervalContext ();
IntervalContext ()
{
}
public override Interval TopValue { get { return Interval.TopValue; } }
public override Interval BottomValue { get { return Interval.BottomValue; } }
public override Interval Zero { get { return Interval.For (Rational.Zero); } }
public override Interval One { get { return Interval.For (Rational.One); } }
public override Interval Positive { get { return Interval.For (0, Rational.PlusInfinity); } }
public override Interval Negative { get { return Interval.For (Rational.MinusInfinity, 0); } }
public override Interval GreaterEqualThanMinusOne { get { return Interval.For (Rational.MinusOne, Rational.PlusInfinity); } }
public override Interval For (long value)
{
return Interval.For (value);
}
public override Interval For (long lower, long upper)
{
return Interval.For (lower, upper);
}
public override Interval For (long lower, Rational upper)
{
return Interval.For (lower, upper);
}
public override Interval For (Rational lower, long upper)
{
return Interval.For (lower, upper);
}
public override Interval For (Rational value)
{
return Interval.For (value);
}
public override Interval For (Rational lower, Rational upper)
{
return Interval.For (lower, upper);
}
public override Interval LeftOpen (Rational upperBound)
{
return Interval.For (Rational.MinusInfinity, upperBound);
}
public override Interval RightOpen (Rational lowerBound)
{
return Interval.For (lowerBound, Rational.PlusInfinity);
}
public override Interval Add (Interval a, Interval b)
{
return a + b;
}
public override Interval Sub (Interval a, Interval b)
{
return a - b;
}
public override Interval Div (Interval a, Interval b)
{
return a / b;
}
public override Interval Mul (Interval a, Interval b)
{
return a * b;
}
public override Interval Not (Interval value)
{
if (!value.IsNormal ())
return value;
int intValue;
if (value.TryGetSingletonFiniteInt32 (out intValue))
return Interval.For (intValue != 0 ? 0 : 1);
return Interval.TopValue;
}
public override Interval Rem (Interval a, Interval b)
{
return TopValue;
}
public override Interval UnaryMinus (Interval value)
{
return -value;
}
public override Interval ApplyConversion (ExpressionOperator conv, Interval intv)
{
return Interval.ApplyConversion (conv, intv);
}
}
}
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