Initial import

1 files changed, 54 insertions, 0 deletions

diff --git a/Xamarin.Forms.Xaml/TypeArgumentsParser.cs b/Xamarin.Forms.Xaml/TypeArgumentsParser.cs
new file mode 100644
index 00000000..59b2dd0a
--- /dev/null
+++ b/Xamarin.Forms.Xaml/TypeArgumentsParser.cs
@@ -0,0 +1,54 @@
+using System.Collections.Generic;
+using System.Xml;
+
+namespace Xamarin.Forms.Xaml
+{
+	internal static class TypeArgumentsParser
+	{
+		public static IList<XmlType> ParseExpression(string expression, IXmlNamespaceResolver resolver, IXmlLineInfo lineInfo)
+		{
+			var typeList = new List<XmlType>();
+			while (!string.IsNullOrWhiteSpace(expression))
+			{
+				var match = expression;
+				typeList.Add(Parse(match, ref expression, resolver, lineInfo));
+			}
+			return typeList;
+		}
+
+		static XmlType Parse(string match, ref string remaining, IXmlNamespaceResolver resolver, IXmlLineInfo lineinfo)
+		{
+			remaining = null;
+			int parensCount = 0;
+			int pos = 0;
+			bool isGeneric = false;
+
+			for (pos = 0; pos < match.Length; pos++)
+			{
+				if (match[pos] == '(')
+				{
+					parensCount++;
+					isGeneric = true;
+				}
+				else if (match[pos] == ')')
+					parensCount--;
+				else if (match[pos] == ',' && parensCount == 0)
+				{
+					remaining = match.Substring(pos + 1);
+					break;
+				}
+			}
+			var type = match.Substring(0, pos).Trim();
+
+			IList<XmlType> typeArguments = null;
+			if (isGeneric)
+			{
+				typeArguments = ParseExpression(
+					type.Substring(type.IndexOf('(') + 1, type.LastIndexOf(')') - type.IndexOf('(') - 1), resolver, lineinfo);
+				type = type.Substring(0, type.IndexOf('('));
+			}
+			var namespaceuri = type.Contains(":") ? resolver.LookupNamespace(type.Split(':')[0].Trim()) : "";
+			return new XmlType(namespaceuri, type, typeArguments);
+		}
+	}
+}
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