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//
// DisIntervalAssumer.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;
namespace Mono.CodeContracts.Static.Analysis.Numerical {
class DisIntervalAssumer<Var, Expr> : IntervalRationalAssumerBase<Var, Expr, DisInterval>
where Var : IEquatable<Var> {
public override IntervalEnvironmentBase<Var, Expr, DisInterval, Rational> AssumeNotEqualToZero
(Var var, IntervalEnvironmentBase<Var, Expr, DisInterval, Rational> env)
{
return AssumeEqualToDisInterval (var, DisInterval.NotZero, env);
}
static IntervalEnvironmentBase<Var, Expr, DisInterval, Rational> AssumeEqualToDisInterval
(Var var, DisInterval intv, IntervalEnvironmentBase<Var, Expr, DisInterval, Rational> env)
{
return env.RefineVariable (var, intv);
}
public override IntervalEnvironmentBase<Var, Expr, DisInterval, Rational> AssumeNotEqual
(Expr left, Expr right, IntervalEnvironmentBase<Var, Expr, DisInterval, Rational> env)
{
var result = env;
var rightIntv = env.Eval (right);
if (rightIntv.IsSinglePoint) {
var everythingExcept = DisInterval.EverythingExcept (rightIntv);
result = result.RefineVariable (env.Decoder.UnderlyingVariable (left), everythingExcept);
}
IntervalInference.InferenceResult<Var, DisInterval> resultLeft;
IntervalInference.InferenceResult<Var, DisInterval> resultRight;
IntervalInference.ConstraintsFor.NotEqual (left, right, env.Decoder, result, out resultLeft,
out resultRight);
var join = resultLeft.Join (resultRight);
if (join.IsBottom)
return env.Bottom as IntervalEnvironmentBase<Var, Expr, DisInterval, Rational>;
return AssumeConstraints (join.Constraints, env);
}
}
}
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