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

   1 //
   2 // GenericTypeExpressionVisitor.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 namespace Mono.CodeContracts.Static.Analysis.Numerical {
  30         abstract class GenericTypeExpressionVisitor<TVariable, TExpression, TIn, TOut> {
  31                 protected readonly IExpressionDecoder<TVariable, TExpression> Decoder;
  32
  33                 protected GenericTypeExpressionVisitor (IExpressionDecoder<TVariable, TExpression> decoder)
  34                 {
  35                         Decoder = decoder;
  36                 }
  37
  38                 public virtual TOut Visit (TExpression e, TIn input)
  39                 {
  40                         switch (Decoder.TypeOf (e)) {
  41                         case ExpressionType.Unknown:
  42                                 return Default (e, input);
  43                         case ExpressionType.Int32:
  44                                 return VisitInt32 (e, input);
  45                         case ExpressionType.Bool:
  46                                 return VisitBool (e, input);
  47                         default:
  48                                 throw new AbstractInterpretationException ("Unknown type for expressions " +
  49                                                                            Decoder.TypeOf (e));
  50                         }
  51                 }
  52
  53                 protected virtual TOut VisitBool (TExpression expr, TIn input)
  54                 {
  55                         return Default (expr, input);
  56                 }
  57
  58                 protected virtual TOut VisitInt32 (TExpression expr, TIn input)
  59                 {
  60                         return Default (expr, input);
  61                 }
  62
  63                 protected abstract TOut Default (TExpression expr, TIn input);
  64         }
  65 }