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//
// SetDomain.cs
//
// Authors:
// Alexander Chebaturkin (chebaturkin@gmail.com)
//
// Copyright (C) 2011 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;
using System.IO;
using Mono.CodeContracts.Static.DataStructures;
namespace Mono.CodeContracts.Static.Lattices {
struct SetDomain<T> : IAbstractDomain<SetDomain<T>>
where T : IEquatable<T> {
public static readonly SetDomain<T> TopValue = new SetDomain<T> (ImmutableSet<T>.Empty ());
public static readonly SetDomain<T> BottomValue = new SetDomain<T> ((IImmutableSet<T>) null);
readonly IImmutableSet<T> set;
SetDomain (IImmutableSet<T> set)
{
this.set = set;
}
public SetDomain (Func<T, int> keyConverter)
{
set = ImmutableSet<T>.Empty (keyConverter);
}
public SetDomain<T> Top { get { return TopValue; } }
public SetDomain<T> Bottom { get { return BottomValue; } }
public bool IsTop { get { return set != null && set.Count == 0; } }
public bool IsBottom { get { return set == null; } }
public SetDomain<T> Join (SetDomain<T> that)
{
SetDomain<T> result;
if (this.TryTrivialJoin (that, out result))
return result;
return new SetDomain<T> (set.Intersect (that.set));
}
public SetDomain<T> Join (SetDomain<T> that, bool widening, out bool weaker)
{
if (set == that.set) {
weaker = false;
return this;
}
if (IsBottom) {
weaker = !that.IsBottom;
return that;
}
if (that.IsBottom || IsTop) {
weaker = false;
return this;
}
if (that.IsTop) {
weaker = !IsTop;
return that;
}
var join = set.Intersect (that.set);
weaker = join.Count < set.Count;
return new SetDomain<T> (join);
}
public SetDomain<T> Widen (SetDomain<T> that)
{
//no widening - finite lattice
return Join (that);
}
public SetDomain<T> Meet (SetDomain<T> that)
{
SetDomain<T> result;
if (this.TryTrivialMeet (that, out result))
return result;
return new SetDomain<T> (set.Union (that.set));
}
public bool LessEqual (SetDomain<T> that)
{
if (IsBottom)
return true;
if (that.IsBottom)
return false;
return that.set.IsContainedIn (set);
}
public SetDomain<T> ImmutableVersion ()
{
return this;
}
public SetDomain<T> Clone ()
{
return this;
}
public SetDomain<T> With (T elem)
{
return new SetDomain<T> (set.Add (elem));
}
public SetDomain<T> Without (T elem)
{
return new SetDomain<T> (set.Remove (elem));
}
public bool Contains (T item)
{
return set.Contains (item);
}
public void Dump (TextWriter tw)
{
if (IsBottom)
tw.WriteLine ("Bot");
else if (IsTop)
tw.WriteLine ("Top");
else
set.Dump (tw);
}
}
}
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