From 267b3fab0a54c93baec7db30bae46056abd63407 Mon Sep 17 00:00:00 2001
From: Ajay Bhargav Baaskaran <ajbaaska@microsoft.com>
Date: Thu, 6 Jul 2017 19:24:25 -0700
Subject: [PATCH] Made IntermediateNodeWalker.Ancestors indexable

---
 .../Intermediate/IntermediateNodeWalker.cs             | 10 +++++-----
 .../Intermediate/IntermediateNodeWalkerTest.cs         |  2 +-
 2 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/src/Microsoft.AspNetCore.Razor.Language/Intermediate/IntermediateNodeWalker.cs b/src/Microsoft.AspNetCore.Razor.Language/Intermediate/IntermediateNodeWalker.cs
index b333bda1d0..8cafe05a9a 100644
--- a/src/Microsoft.AspNetCore.Razor.Language/Intermediate/IntermediateNodeWalker.cs
+++ b/src/Microsoft.AspNetCore.Razor.Language/Intermediate/IntermediateNodeWalker.cs
@@ -7,11 +7,11 @@ namespace Microsoft.AspNetCore.Razor.Language.Intermediate
 {
     public abstract class IntermediateNodeWalker : IntermediateNodeVisitor
     {
-        private readonly Stack<IntermediateNode> _ancestors = new Stack<IntermediateNode>();
+        private readonly List<IntermediateNode> _ancestors = new List<IntermediateNode>();
 
-        protected IEnumerable<IntermediateNode> Ancestors => _ancestors;
+        protected IReadOnlyList<IntermediateNode> Ancestors => _ancestors;
 
-        protected IntermediateNode Parent => _ancestors.Count > 0 ? _ancestors.Peek() : null;
+        protected IntermediateNode Parent => _ancestors.Count > 0 ? _ancestors[0] : null;
 
         public override void VisitDefault(IntermediateNode node)
         {
@@ -21,7 +21,7 @@ namespace Microsoft.AspNetCore.Razor.Language.Intermediate
                 return;
             }
 
-            _ancestors.Push(node);
+            _ancestors.Insert(0, node);
 
             try
             {
@@ -33,7 +33,7 @@ namespace Microsoft.AspNetCore.Razor.Language.Intermediate
             }
             finally
             {
-                _ancestors.Pop();
+                _ancestors.RemoveAt(0);
             }
         }
     }
diff --git a/test/Microsoft.AspNetCore.Razor.Language.Test/Intermediate/IntermediateNodeWalkerTest.cs b/test/Microsoft.AspNetCore.Razor.Language.Test/Intermediate/IntermediateNodeWalkerTest.cs
index 50f0894df6..f91735f9c3 100644
--- a/test/Microsoft.AspNetCore.Razor.Language.Test/Intermediate/IntermediateNodeWalkerTest.cs
+++ b/test/Microsoft.AspNetCore.Razor.Language.Test/Intermediate/IntermediateNodeWalkerTest.cs
@@ -93,7 +93,7 @@ namespace Microsoft.AspNetCore.Razor.Language.Intermediate
 
         private class DerivedIntermediateNodeWalker : IntermediateNodeWalker
         {
-            public new IEnumerable<IntermediateNode> Ancestors => base.Ancestors;
+            public new IReadOnlyList<IntermediateNode> Ancestors => base.Ancestors;
 
             public new IntermediateNode Parent => base.Parent;