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

   1 //
   2 // ExpressionOperator.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 namespace Mono.CodeContracts.Static.Analysis.Numerical {
  32         public enum ExpressionOperator {
  33                 Constant,
  34                 Variable,
  35                 Not,
  36                 And,
  37                 Or,
  38                 Xor,
  39                 LogicalAnd,
  40                 LogicalOr,
  41                 LogicalNot,
  42                 Equal,
  43                 Equal_Obj,
  44                 NotEqual,
  45                 LessThan,
  46                 LessEqualThan,
  47                 GreaterThan,
  48                 GreaterEqualThan,
  49                 Add,
  50                 Sub,
  51                 Mult,
  52                 Div,
  53                 Mod,
  54                 UnaryMinus,
  55                 SizeOf,
  56                 Unknown,
  57
  58                 ConvertToInt32
  59         }
  60
  61         static class ExpressionOperatorExtensions {
  62                 static readonly HashSet<ExpressionOperator> relationalOperators = new HashSet<ExpressionOperator> ();
  63
  64                 static ExpressionOperatorExtensions ()
  65                 {
  66                         relationalOperators.Add (ExpressionOperator.LessThan);
  67                         relationalOperators.Add (ExpressionOperator.LessEqualThan);
  68                         relationalOperators.Add (ExpressionOperator.GreaterThan);
  69                         relationalOperators.Add (ExpressionOperator.GreaterEqualThan);
  70                         relationalOperators.Add (ExpressionOperator.Equal);
  71                         relationalOperators.Add (ExpressionOperator.Equal_Obj);
  72                         relationalOperators.Add (ExpressionOperator.NotEqual);
  73                 }
  74
  75                 public static bool IsUnary (this ExpressionOperator op)
  76                 {
  77                         return op == ExpressionOperator.UnaryMinus || op == ExpressionOperator.Not;
  78                 }
  79
  80                 public static bool IsZerary (this ExpressionOperator op)
  81                 {
  82                         return op == ExpressionOperator.Constant || op == ExpressionOperator.Variable;
  83                 }
  84
  85                 public static bool IsBinary (this ExpressionOperator op)
  86                 {
  87                         return !op.IsUnary () && !op.IsZerary ();
  88                 }
  89
  90                 public static bool IsGreaterThan (this ExpressionOperator op)
  91                 {
  92                         return op == ExpressionOperator.GreaterThan;
  93                 }
  94
  95                 public static bool IsGreaterEqualThan (this ExpressionOperator op)
  96                 {
  97                         return op == ExpressionOperator.GreaterEqualThan;
  98                 }
  99
 100                 public static bool IsLessThan (this ExpressionOperator op)
 101                 {
 102                         return op == ExpressionOperator.LessThan;
 103                 }
 104
 105                 public static bool IsLessEqualThan (this ExpressionOperator op)
 106                 {
 107                         return op == ExpressionOperator.LessEqualThan;
 108                 }
 109
 110                 public static bool IsRelational (this ExpressionOperator op)
 111                 {
 112                         return relationalOperators.Contains (op);
 113                 }
 114         }
 115 }