shared source/sscli20/jscript/engine/enumeratorconstructor.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.Collections;
  20     using System.Diagnostics;
  21     using System.Reflection;
  22
  23     public sealed class EnumeratorConstructor : ScriptFunction{
  24       internal static readonly EnumeratorConstructor ob = new EnumeratorConstructor();
  25
  26       private EnumeratorPrototype originalPrototype;
  27
  28       internal EnumeratorConstructor()
  29         : base(FunctionPrototype.ob, "Enumerator", 1) {
  30         this.originalPrototype = EnumeratorPrototype.ob;
  31         EnumeratorPrototype._constructor = this;
  32         this.proto = EnumeratorPrototype.ob;
  33       }
  34
  35       internal EnumeratorConstructor(LenientFunctionPrototype parent, LenientEnumeratorPrototype prototypeProp)
  36         : base(parent, "Enumerator", 1) {
  37         this.originalPrototype = prototypeProp;
  38         prototypeProp.constructor = this;
  39         this.proto = prototypeProp;
  40         this.noExpando = false;
  41       }
  42
  43       internal override Object Call(Object[] args, Object thisob){
  44         return null;
  45       }
  46
  47       internal override Object Construct(Object[] args){
  48         return this.CreateInstance(args);
  49       }
  50
  51       [JSFunctionAttribute(JSFunctionAttributeEnum.HasVarArgs)]
  52       public new EnumeratorObject CreateInstance(params Object[] args){
  53         if (args.Length != 0){
  54           Object obj = args[0];
  55           if (obj is IEnumerable)
  56             return new EnumeratorObject(this.originalPrototype, (IEnumerable)obj);
  57           throw new JScriptException(JSError.NotCollection);
  58         }else
  59           return new EnumeratorObject(this.originalPrototype, (IEnumerable)null);
  60       }
  61
  62       public Object Invoke(){
  63         return null;
  64       }
  65
  66     }
  67 }