mcs/class/Microsoft.CSharp/Microsoft.CSharp.RuntimeBinder/CSharpUnaryOperationBinder.cs

   1 //
   2 // CSharpUnaryOperationBinder.cs
   3 //
   4 // Authors:
   5 //      Marek Safar  <marek.safar@gmail.com>
   6 //
   7 // Copyright (C) 2009 Novell, Inc (http://www.novell.com)
   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;
  30 using System.Dynamic;
  31 using System.Collections.Generic;
  32 using System.Linq;
  33 using System.Linq.Expressions;
  34 using Compiler = Mono.CSharp;
  35
  36 namespace Microsoft.CSharp.RuntimeBinder
  37 {
  38         class CSharpUnaryOperationBinder : UnaryOperationBinder
  39         {
  40                 IList<CSharpArgumentInfo> argumentInfo;
  41                 readonly CSharpBinderFlags flags;
  42                 readonly Type context;
  43
  44                 public CSharpUnaryOperationBinder (ExpressionType operation, CSharpBinderFlags flags, Type context, IEnumerable<CSharpArgumentInfo> argumentInfo)
  45                         : base (operation)
  46                 {
  47                         this.argumentInfo = argumentInfo.ToReadOnly ();
  48                         if (this.argumentInfo.Count != 1)
  49                                 throw new ArgumentException ("Unary operation requires 1 argument");
  50
  51                         this.flags = flags;
  52                         this.context = context;
  53                 }
  54
  55
  56                 Compiler.Unary.Operator GetOperator ()
  57                 {
  58                         switch (Operation) {
  59                         case ExpressionType.Negate:
  60                                 return Compiler.Unary.Operator.UnaryNegation;
  61                         case ExpressionType.Not:
  62                                 return Compiler.Unary.Operator.LogicalNot;
  63                         case ExpressionType.OnesComplement:
  64                                 return Compiler.Unary.Operator.OnesComplement;
  65                         case ExpressionType.UnaryPlus:
  66                                 return Compiler.Unary.Operator.UnaryPlus;
  67                         default:
  68                                 throw new NotImplementedException (Operation.ToString ());
  69                         }
  70                 }
  71
  72                 public override DynamicMetaObject FallbackUnaryOperation (DynamicMetaObject target, DynamicMetaObject errorSuggestion)
  73                 {
  74                         var ctx = DynamicContext.Create ();
  75                         var expr = ctx.CreateCompilerExpression (argumentInfo [0], target);
  76
  77                         if (Operation == ExpressionType.IsTrue) {
  78                                 expr = new Compiler.BooleanExpression (expr);
  79                         } else if (Operation == ExpressionType.IsFalse) {
  80                                 expr = new Compiler.BooleanExpressionFalse (expr);
  81                         } else {
  82                                 if (Operation == ExpressionType.Increment)
  83                                         expr = new Compiler.UnaryMutator (Compiler.UnaryMutator.Mode.PreIncrement, expr, Compiler.Location.Null);
  84                                 else if (Operation == ExpressionType.Decrement)
  85                                         expr = new Compiler.UnaryMutator (Compiler.UnaryMutator.Mode.PreDecrement, expr, Compiler.Location.Null);
  86                                 else
  87                                         expr = new Compiler.Unary (GetOperator (), expr, Compiler.Location.Null);
  88
  89                                 expr = new Compiler.Cast (new Compiler.TypeExpression (ctx.ImportType (ReturnType), Compiler.Location.Null), expr, Compiler.Location.Null);
  90
  91                                 if ((flags & CSharpBinderFlags.CheckedContext) != 0)
  92                                         expr = new Compiler.CheckedExpr (expr, Compiler.Location.Null);
  93                         }
  94
  95                         var binder = new CSharpBinder (this, expr, errorSuggestion);
  96                         binder.AddRestrictions (target);
  97
  98                         return binder.Bind (ctx, context);
  99                 }
 100         }
 101 }