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//
// ConstToIntervalEvaluator.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 ConstToIntervalEvaluator<TContext, TVar, TExpr, TInterval, TNumeric> :
GenericTypeExpressionVisitor<TVar, TExpr, TContext, TInterval>
where TContext : IntervalContextBase<TInterval, TNumeric>
where TVar : IEquatable<TVar>
where TInterval : IntervalBase<TInterval, TNumeric> {
public ConstToIntervalEvaluator (IExpressionDecoder<TVar, TExpr> decoder)
: base (decoder)
{
}
public override TInterval Visit (TExpr e, TContext ctx)
{
if (!ReferenceEquals (e, null) && Decoder.IsConstant (e))
return base.Visit (e, ctx);
return Default (e, ctx);
}
protected override TInterval VisitBool (TExpr expr, TContext ctx)
{
bool value;
if (Decoder.TryValueOf (expr, ExpressionType.Bool, out value))
return ctx.For (value ? 1L : 0L);
return Default (expr, ctx);
}
protected override TInterval VisitInt32 (TExpr expr, TContext ctx)
{
int value;
if (Decoder.TryValueOf (expr, ExpressionType.Int32, out value))
return ctx.For (value);
return Default (expr, ctx);
}
protected override TInterval Default (TExpr expr, TContext ctx)
{
return ctx.TopValue;
}
}
}
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