shared source/sscli20/jscript/engine/scriptobjectpropertyenumerator.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.Reflection;
  21
  22     internal class ScriptObjectPropertyEnumerator : IEnumerator{
  23       private ArrayList enumerators;
  24       private ArrayList objects;
  25       private int index;
  26       private SimpleHashtable visited_names;
  27
  28       internal ScriptObjectPropertyEnumerator(ScriptObject obj){
  29         obj.GetPropertyEnumerator(this.enumerators = new ArrayList(), this.objects = new ArrayList());
  30         this.index = 0;
  31         this.visited_names = new SimpleHashtable(16);
  32       }
  33
  34       public virtual bool MoveNext(){
  35         if (this.index >= this.enumerators.Count)
  36           return false;
  37         IEnumerator ienum = (IEnumerator)this.enumerators[this.index];
  38         bool result = ienum.MoveNext();
  39         if (!result){
  40           this.index++; return this.MoveNext();
  41         }
  42         Object ob = ienum.Current;
  43         String pname;
  44         FieldInfo field = ob as FieldInfo;
  45         if (field != null){
  46           JSPrototypeField pfield = ob as JSPrototypeField;
  47           if (pfield != null && pfield.value is Missing)
  48             return this.MoveNext();
  49           pname = field.Name;
  50           Object val = field.GetValue(this.objects[this.index]);
  51           if (val is Missing)
  52             return this.MoveNext();
  53         }else if (ob is String)
  54           pname = (String)ob;
  55         else if (ob is MemberInfo)
  56           pname = ((MemberInfo)ob).Name;
  57         else
  58           pname = ob.ToString();
  59         if (this.visited_names[pname] != null)
  60           return this.MoveNext();
  61         this.visited_names[pname] = pname;
  62         return true;
  63       }
  64
  65       public virtual Object Current{
  66         get{
  67           Object ob = ((IEnumerator)this.enumerators[this.index]).Current;
  68           if (ob is MemberInfo)
  69             return ((MemberInfo)ob).Name;
  70           else
  71             return ob.ToString();
  72         }
  73       }
  74
  75       public virtual void Reset(){
  76         this.index = 0;
  77         foreach(System.Collections.IEnumerator e in this.enumerators)
  78           e.Reset();
  79         this.visited_names = new SimpleHashtable(16);
  80       }
  81     }
  82 }