Initial import

1 files changed, 79 insertions, 0 deletions

diff --git a/Xamarin.Forms.Xaml/NamescopingVisitor.cs b/Xamarin.Forms.Xaml/NamescopingVisitor.cs
new file mode 100644
index 00000000..0651d045
--- /dev/null
+++ b/Xamarin.Forms.Xaml/NamescopingVisitor.cs
@@ -0,0 +1,79 @@
+using System.Collections.Generic;
+using Xamarin.Forms.Internals;
+
+namespace Xamarin.Forms.Xaml
+{
+	internal class NamescopingVisitor : IXamlNodeVisitor
+	{
+		readonly Dictionary<INode, INameScope> scopes = new Dictionary<INode, INameScope>();
+
+		public NamescopingVisitor(HydratationContext context)
+		{
+			Values = context.Values;
+		}
+
+		Dictionary<INode, object> Values { get; set; }
+
+		public bool VisitChildrenFirst
+		{
+			get { return false; }
+		}
+
+		public bool StopOnDataTemplate
+		{
+			get { return false; }
+		}
+
+		public bool StopOnResourceDictionary
+		{
+			get { return false; }
+		}
+
+		public void Visit(ValueNode node, INode parentNode)
+		{
+			scopes[node] = scopes[parentNode];
+		}
+
+		public void Visit(MarkupNode node, INode parentNode)
+		{
+			scopes[node] = scopes[parentNode];
+		}
+
+		public void Visit(ElementNode node, INode parentNode)
+		{
+			var ns = parentNode == null || IsDataTemplate(node, parentNode) || IsStyle(node, parentNode)
+				? new NameScope()
+				: scopes[parentNode];
+			node.Namescope = ns;
+			scopes[node] = ns;
+		}
+
+		public void Visit(RootNode node, INode parentNode)
+		{
+			var ns = new NameScope();
+			node.Namescope = ns;
+			scopes[node] = ns;
+		}
+
+		public void Visit(ListNode node, INode parentNode)
+		{
+			scopes[node] = scopes[parentNode];
+		}
+
+		static bool IsDataTemplate(INode node, INode parentNode)
+		{
+			var parentElement = parentNode as IElementNode;
+			INode createContent;
+			if (parentElement != null && parentElement.Properties.TryGetValue(XmlName._CreateContent, out createContent) &&
+			    createContent == node)
+				return true;
+			return false;
+		}
+
+		static bool IsStyle(INode node, INode parentNode)
+		{
+			var pnode = parentNode as ElementNode;
+			return pnode != null && pnode.XmlType.Name == "Style";
+		}
+	}
+}
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