2 // IIntervalEnvironment.cs
5 // Alexander Chebaturkin (chebaturkin@gmail.com)
7 // Copyright (C) 2012 Alexander Chebaturkin
9 // Permission is hereby granted, free of charge, to any person obtaining
10 // a copy of this software and associated documentation files (the
11 // "Software"), to deal in the Software without restriction, including
12 // without limitation the rights to use, copy, modify, merge, publish,
13 // distribute, sublicense, and/or sell copies of the Software, and to
14 // permit persons to whom the Software is furnished to do so, subject to
15 // the following conditions:
17 // The above copyright notice and this permission notice shall be
18 // included in all copies or substantial portions of the Software.
20 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
21 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
22 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
23 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
24 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
25 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
26 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
29 using Mono.CodeContracts.Static.Lattices;
31 namespace Mono.CodeContracts.Static.Analysis.Numerical {
32 interface INumericalEnvironmentDomain<TVar, TExpr> :
33 IEnvironmentDomain<INumericalEnvironmentDomain<TVar, TExpr>, TVar, TExpr> {
34 INumericalEnvironmentDomain<TVar, TExpr> AssumeVariableIn (TVar var, Interval interval);
35 INumericalEnvironmentDomain<TVar, TExpr> AssumeLessEqualThan (TExpr left, TExpr right);
38 interface IIntervalEnvironment<TVar, TExpr, TInterval, TNumeric> : INumericalEnvironmentDomain<TVar, TExpr>
39 where TInterval : IntervalBase<TInterval, TNumeric> {
40 IntervalContextBase<TInterval, TNumeric> Context { get; }
42 TInterval Eval (TExpr expr);
43 TInterval Eval (TVar expr);
45 bool TryGetValue (TVar rightVar, out TInterval intv);
48 static class NumericalEnvironmentDomainExtensions {
49 public static INumericalEnvironmentDomain<TVar, TExpr> AssumeInInterval<TVar, TExpr> (
50 this INumericalEnvironmentDomain<TVar, TExpr> domain, TExpr expr, Interval intv,
51 IExpressionEncoder<TVar, TExpr> encoder)
53 if (!domain.IsNormal ())
59 if (!intv.LowerBound.IsInfinity)
60 domain = domain.AssumeLessEqualThan (intv.LowerBound.ToExpression (encoder), expr);
62 if (!intv.UpperBound.IsInfinity)
63 domain = domain.AssumeLessEqualThan (expr, intv.LowerBound.ToExpression (encoder));