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

   1 //
   2 // GetThresholdVisitor.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         class GetThresholdVisitor<TVar, TExpr> : GenericExpressionVisitor<Dummy, bool, TVar, TExpr> {
  35                 public List<int> Thresholds { get; private set; }
  36
  37                 public GetThresholdVisitor (IExpressionDecoder<TVar, TExpr> decoder) : base (decoder)
  38                 {
  39                         Thresholds = new List<int> ();
  40                 }
  41
  42                 protected override bool Default (Dummy data)
  43                 {
  44                         return false;
  45                 }
  46
  47                 public override bool VisitConstant (TExpr expr, Dummy data)
  48                 {
  49                         int value;
  50                         if (Decoder.IsConstantInt (expr, out value))
  51                                 return false;
  52
  53                         Thresholds.Add (value);
  54                         return true;
  55                 }
  56
  57                 public override bool VisitLessThan (TExpr left, TExpr right, TExpr original, Dummy data)
  58                 {
  59                         return VisitBinary (left, right, data);
  60                 }
  61
  62                 public override bool VisitLessEqualThan (TExpr left, TExpr right, TExpr original, Dummy data)
  63                 {
  64                         return VisitBinary (left, right, data);
  65                 }
  66
  67                 public override bool VisitGreaterThan (TExpr left, TExpr right, TExpr original, Dummy data)
  68                 {
  69                         return VisitBinary (left, right, data);
  70                 }
  71
  72                 public override bool VisitGreaterEqualThan (TExpr left, TExpr right, TExpr original, Dummy data)
  73                 {
  74                         return VisitBinary (left, right, data);
  75                 }
  76
  77                 public override bool VisitNotEqual (TExpr left, TExpr right, TExpr original, Dummy data)
  78                 {
  79                         return VisitBinary (left, right, data);
  80                 }
  81
  82                 public override bool VisitEqual (TExpr left, TExpr right, TExpr original, Dummy data)
  83                 {
  84                         return VisitBinary (left, right, data);
  85                 }
  86
  87                 bool VisitBinary (TExpr left, TExpr right, Dummy data)
  88                 {
  89                         var gatheredFromLeft = Visit (left, data);
  90                         var gatheredFromRight = Visit (right, data);
  91
  92                         return gatheredFromLeft || gatheredFromRight;
  93                 }
  94         }
  95 }