mcs/class/Mono.CodeContracts/Mono.CodeContracts.Static.Lattices/AbstractDomainExtensions.cs

   1 //
   2 // AbstractDomainExtensions.cs
   3 //
   4 // Authors:
   5 //      Alexander Chebaturkin (chebaturkin@gmail.com)
   6 //
   7 // Copyright (C) 2012 Alexander Chebaturkin
   8 //
   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:
  16 //
  17 // The above copyright notice and this permission notice shall be
  18 // included in all copies or substantial portions of the Software.
  19 //
  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.
  27 //
  28
  29 using Mono.CodeContracts.Static.DataStructures;
  30
  31 namespace Mono.CodeContracts.Static.Lattices {
  32         public static class AbstractDomainExtensions {
  33                 public static bool IsNormal<T> (this IAbstractDomain<T> domain)
  34                 {
  35                         return !domain.IsTop && !domain.IsBottom;
  36                 }
  37
  38                 public static string BottomSymbolIfAny<T> (this IAbstractDomain<T> domain)
  39                 {
  40                         return domain.IsBottom ? "_|_" : string.Empty;
  41                 }
  42
  43                 public static bool TryTrivialLessEqual<T> (this T left, T right, out bool result)
  44                         where T : IAbstractDomain<T>
  45                 {
  46                         if (ReferenceEquals (left, right))
  47                                 return true.With (true, out result);
  48
  49                         if (left.IsBottom)
  50                                 return true.With (true, out result);
  51
  52                         if (left.IsTop)
  53                                 return true.With (right.IsTop, out result);
  54
  55                         if (right.IsBottom)
  56                                 return true.With (false, out result);
  57
  58                         if (right.IsTop)
  59                                 return true.With (true, out result);
  60
  61                         return false.Without (out result);
  62                 }
  63
  64                 public static bool TryTrivialJoin<T> (this T left, T right, out T result)
  65                         where T : IAbstractDomain<T>
  66                 {
  67                         if (ReferenceEquals (left, right))
  68                                 return true.With (left, out result);
  69
  70                         if (left.IsBottom)
  71                                 return true.With (right, out result);
  72
  73                         if (left.IsTop)
  74                                 return true.With (left, out result);
  75
  76                         if (right.IsBottom)
  77                                 return true.With (left, out result);
  78
  79                         if (right.IsTop)
  80                                 return true.With (right, out result);
  81
  82                         return false.Without (out result);
  83                 }
  84
  85                 public static bool TryTrivialMeet<T> (this T left, T right, out T result)
  86                         where T : IAbstractDomain<T>
  87                 {
  88                         if (ReferenceEquals (left, right))
  89                                 return true.With (left, out result);
  90
  91                         if (left.IsBottom)
  92                                 return true.With (left, out result);
  93
  94                         if (left.IsTop)
  95                                 return true.With (right, out result);
  96
  97                         if (right.IsBottom)
  98                                 return true.With (right, out result);
  99
 100                         if (right.IsTop)
 101                                 return true.With (left, out result);
 102
 103                         return false.Without (out result);
 104                 }
 105         }
 106 }