mcs/class/Mono.CodeContracts/Mono.CodeContracts.Static.Analysis.Numerical/TresholdDB.cs

   1 //
   2 // TresholdDB.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 System.Collections.Generic;
  30
  31 using Mono.CodeContracts.Static.DataStructures;
  32
  33 namespace Mono.CodeContracts.Static.Analysis.Numerical {
  34         static class ThresholdDB {
  35                 static RationalThreshold rational = new RationalThreshold (10);
  36
  37                 public static void Reset ()
  38                 {
  39                         rational = new RationalThreshold (10);
  40                 }
  41
  42                 public static void Add (IEnumerable<int> values)
  43                 {
  44                         foreach (var value in values) {
  45                                 rational.Add (Rational.For (value));
  46                         }
  47                 }
  48
  49                 public static Rational GetNext (Rational value)
  50                 {
  51                         return rational.GetNext (value);
  52                 }
  53
  54                 public static Rational GetPrevious (Rational value)
  55                 {
  56                         return rational.GetPrevious (value);
  57                 }
  58
  59                 public static bool TryGetAThreshold<TVar, TExpr> (TExpr e, IExpressionDecoder<TVar, TExpr> decoder, out List<int> thresholds)
  60                 {
  61                         var visitor = new GetThresholdVisitor<TVar, TExpr> (decoder);
  62                         if (visitor.Visit (e, Dummy.Value)) {
  63                                 thresholds = new List<int> ();
  64                                 foreach (var threshold in visitor.Thresholds) {
  65                                         thresholds.Add (threshold - 1);
  66                                         thresholds.Add (threshold);
  67                                         thresholds.Add (threshold + 1);
  68                                 }
  69                                 return true;
  70                         }
  71
  72                         return false.Without (out thresholds);
  73                 }
  74         }
  75 }