1 files changed, 56 insertions, 0 deletions
diff --git a/Xamarin.Forms.Core/Internals/NameScope.cs b/Xamarin.Forms.Core/Internals/NameScope.cs
new file mode 100644
index 00000000..b29534b6
--- /dev/null
+++ b/Xamarin.Forms.Core/Internals/NameScope.cs
@@ -0,0 +1,56 @@
+using System;
+using System.Collections.Generic;
+using System.Xml;
+using Xamarin.Forms.Xaml;
+
+namespace Xamarin.Forms.Internals
+{
+	public class NameScope : INameScope
+	{
+		public static readonly BindableProperty NameScopeProperty = BindableProperty.CreateAttached("NameScope", typeof(INameScope), typeof(NameScope), default(INameScope));
+
+		readonly Dictionary<string, object> _names = new Dictionary<string, object>();
+
+		object INameScope.FindByName(string name)
+		{
+			if (_names.ContainsKey(name))
+				return _names[name];
+			return null;
+		}
+
+		void INameScope.RegisterName(string name, object scopedElement)
+		{
+			if (_names.ContainsKey(name))
+				throw new ArgumentException("An element with the same key already exists in NameScope", "name");
+
+			_names[name] = scopedElement;
+		}
+
+		void INameScope.RegisterName(string name, object scopedElement, IXmlLineInfo xmlLineInfo)
+		{
+			try
+			{
+				((INameScope)this).RegisterName(name, scopedElement);
+			}
+			catch (ArgumentException)
+			{
+				throw new XamlParseException(string.Format("An element with the name \"{0}\" already exists in this NameScope", name), xmlLineInfo);
+			}
+		}
+
+		void INameScope.UnregisterName(string name)
+		{
+			_names.Remove(name);
+		}
+
+		public static INameScope GetNameScope(BindableObject bindable)
+		{
+			return (INameScope)bindable.GetValue(NameScopeProperty);
+		}
+
+		public static void SetNameScope(BindableObject bindable, INameScope value)
+		{
+			bindable.SetValue(NameScopeProperty, value);
+		}
+	}
+}
+\ No newline at end of file