1 files changed, 72 insertions, 0 deletions
diff --git a/Xamarin.Forms.Build.Tasks/SetFieldVisitor.cs b/Xamarin.Forms.Build.Tasks/SetFieldVisitor.cs
new file mode 100644
index 00000000..1839cf7b
--- /dev/null
+++ b/Xamarin.Forms.Build.Tasks/SetFieldVisitor.cs
@@ -0,0 +1,72 @@
+using System.Linq;
+using Mono.Cecil.Cil;
+using Xamarin.Forms.Xaml;
+
+namespace Xamarin.Forms.Build.Tasks
+{
+	class SetFieldVisitor : IXamlNodeVisitor
+	{
+		public SetFieldVisitor(ILContext context)
+		{
+			Context = context;
+		}
+
+		public ILContext Context { get; }
+
+		public bool VisitChildrenFirst
+		{
+			get { return false; }
+		}
+
+		public bool StopOnDataTemplate
+		{
+			get { return true; }
+		}
+
+		public bool StopOnResourceDictionary
+		{
+			get { return false; }
+		}
+
+		public void Visit(ValueNode node, INode parentNode)
+		{
+			if (!IsXNameProperty(node, parentNode))
+				return;
+			if (!(parentNode is RootNode))
+			{
+				//no variable assigned for root 
+				var field = Context.Body.Method.DeclaringType.Fields.SingleOrDefault(fd => fd.Name == (string)node.Value);
+				if (field == null)
+					return;
+				Context.IL.Emit(OpCodes.Ldarg_0);
+				Context.IL.Emit(OpCodes.Ldloc, Context.Variables[(IElementNode)parentNode]);
+				Context.IL.Emit(OpCodes.Stfld, field);
+			}
+		}
+
+		public void Visit(MarkupNode node, INode parentNode)
+		{
+		}
+
+		public void Visit(ElementNode node, INode parentNode)
+		{
+		}
+
+		public void Visit(RootNode node, INode parentNode)
+		{
+		}
+
+		public void Visit(ListNode node, INode parentNode)
+		{
+		}
+
+		static bool IsXNameProperty(ValueNode node, INode parentNode)
+		{
+			var parentElement = parentNode as IElementNode;
+			INode xNameNode;
+			if (parentElement != null && parentElement.Properties.TryGetValue(XmlName.xName, out xNameNode) && xNameNode == node)
+				return true;
+			return false;
+		}
+	}
+}
+\ No newline at end of file