shared source/sscli20/jscript/engine/jsclosurefield.cs

   1 // ==++==
   2 //
   3 //
   4 //    Copyright (c) 2006 Microsoft Corporation.  All rights reserved.
   5 //
   6 //    The use and distribution terms for this software are contained in the file
   7 //    named license.txt, which can be found in the root of this distribution.
   8 //    By using this software in any fashion, you are agreeing to be bound by the
   9 //    terms of this license.
  10 //
  11 //    You must not remove this notice, or any other, from this software.
  12 //
  13 //
  14 // ==--==
  15
  16 namespace Microsoft.JScript {
  17
  18     using System;
  19     using System.Globalization;
  20     using System.Reflection;
  21
  22     internal sealed class JSClosureField : JSVariableField{
  23       internal FieldInfo field; //Used to indicate that the field is accessed from a nested (static) function.
  24
  25       internal JSClosureField(FieldInfo field)
  26         : base(field.Name, null, field.Attributes|FieldAttributes.Static){ //Fool the analysis code to OK calls to this method from static code
  27         if (field is JSFieldInfo) field = ((JSFieldInfo)field).field;
  28         this.field = field;
  29       }
  30
  31       public override Type DeclaringType{
  32         get{
  33           return this.field.DeclaringType;
  34         }
  35       }
  36
  37       public override Type FieldType{
  38         get{
  39           return this.field.FieldType;
  40         }
  41       }
  42
  43       internal override IReflect GetInferredType(JSField inference_target){
  44         if (this.field is JSMemberField)
  45           return ((JSMemberField)this.field).GetInferredType(inference_target);
  46         else
  47           return this.field.FieldType;
  48       }
  49
  50       internal override Object GetMetaData(){
  51         if (this.field is JSField)
  52           return ((JSField)this.field).GetMetaData();
  53         else
  54           return this.field;
  55       }
  56
  57       public override Object GetValue(Object obj){
  58         if (obj is StackFrame)
  59           return this.field.GetValue(((StackFrame)((StackFrame)obj).engine.ScriptObjectStackTop()).closureInstance);
  60         throw new JScriptException(JSError.InternalError); //should never happen
  61       }
  62
  63       public override void SetValue(Object obj, Object value, BindingFlags invokeAttr, Binder binder, CultureInfo locale){
  64         if (obj is StackFrame){
  65           this.field.SetValue(((StackFrame)((StackFrame)obj).engine.ScriptObjectStackTop()).closureInstance, value, invokeAttr, binder, locale);
  66           return;
  67         }
  68         throw new JScriptException(JSError.InternalError); //should never happen
  69       }
  70     }
  71 }