Initial import

1 files changed, 56 insertions, 0 deletions

diff --git a/Xamarin.Forms.Xaml/XmlnsHelper.cs b/Xamarin.Forms.Xaml/XmlnsHelper.cs
new file mode 100644
index 00000000..778d2947
--- /dev/null
+++ b/Xamarin.Forms.Xaml/XmlnsHelper.cs
@@ -0,0 +1,56 @@
+using System;
+
+namespace Xamarin.Forms.Xaml
+{
+	internal static class XmlnsHelper
+	{
+		public static bool IsCustom(string ns)
+		{
+			switch (ns)
+			{
+				case "":
+				case "http://xamarin.com/schemas/2014/forms":
+					return false;
+			}
+			return true;
+		}
+
+		public static string ParseNamespaceFromXmlns(string xmlns)
+		{
+			string typeName;
+			string ns;
+			string asm;
+
+			ParseXmlns(xmlns, out typeName, out ns, out asm);
+
+			return ns;
+		}
+
+		public static void ParseXmlns(string xmlns, out string typeName, out string ns, out string asm)
+		{
+			typeName = ns = asm = null;
+
+			foreach (var decl in xmlns.Split(';'))
+			{
+				if (decl.StartsWith("clr-namespace:", StringComparison.Ordinal))
+				{
+					ns = decl.Substring(14, decl.Length - 14);
+					continue;
+				}
+				if (decl.StartsWith("assembly=", StringComparison.Ordinal))
+				{
+					asm = decl.Substring(9, decl.Length - 9);
+					continue;
+				}
+				var nsind = decl.LastIndexOf(".", StringComparison.Ordinal);
+				if (nsind > 0)
+				{
+					ns = decl.Substring(0, nsind);
+					typeName = decl.Substring(nsind + 1, decl.Length - nsind - 1);
+				}
+				else
+					typeName = decl;
+			}
+		}
+	}
+}
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