[XamlC] Compile TypeTypeConverter (#615)

3 files changed, 46 insertions, 2 deletions

diff --git a/Xamarin.Forms.Build.Tasks/CompiledConverters/RectangleTypeConverter.cs b/Xamarin.Forms.Build.Tasks/CompiledConverters/RectangleTypeConverter.cs
index af480667..a7eda95e 100644
--- a/Xamarin.Forms.Build.Tasks/CompiledConverters/RectangleTypeConverter.cs
+++ b/Xamarin.Forms.Build.Tasks/CompiledConverters/RectangleTypeConverter.cs
@@ -1,5 +1,4 @@
-using System;
-using System.Collections.Generic;
+using System.Collections.Generic;
 using System.Globalization;
 using System.Linq;
 
diff --git a/Xamarin.Forms.Build.Tasks/CompiledConverters/TypeTypeConverter.cs b/Xamarin.Forms.Build.Tasks/CompiledConverters/TypeTypeConverter.cs
new file mode 100644
index 00000000..93c3ee58
--- /dev/null
+++ b/Xamarin.Forms.Build.Tasks/CompiledConverters/TypeTypeConverter.cs
@@ -0,0 +1,44 @@
+using System;
+using System.Collections.Generic;
+using System.Xml;
+
+using Mono.Cecil;
+using Mono.Cecil.Cil;
+
+using Xamarin.Forms.Build.Tasks;
+using Xamarin.Forms.Xaml;
+
+namespace Xamarin.Forms.Core.XamlC
+{
+	class TypeTypeConverter : ICompiledTypeConverter
+	{
+		public IEnumerable<Instruction> ConvertFromString(string value, ModuleDefinition module, BaseNode node)
+		{
+			if (string.IsNullOrEmpty(value))
+				goto error;
+
+			var split = value.Split(':');
+			if (split.Length > 2)
+				goto error;
+
+			XmlType xmlType;
+			if (split.Length == 2)
+				xmlType = new XmlType(node.NamespaceResolver.LookupNamespace(split[0]), split[1], null);
+			else
+				xmlType = new XmlType(node.NamespaceResolver.LookupNamespace(""), split[0], null);
+
+			var typeRef = xmlType.GetTypeReference(module, (IXmlLineInfo)node);
+			if (typeRef == null)
+				goto error;
+
+			var getTypeFromHandle = module.Import(typeof(Type).GetMethod("GetTypeFromHandle", new[] { typeof(RuntimeTypeHandle) }));
+			yield return Instruction.Create(OpCodes.Ldtoken, module.Import(typeRef));
+			yield return Instruction.Create(OpCodes.Call, module.Import(getTypeFromHandle));
+			yield break;
+
+		error:
+			throw new XamlParseException($"Cannot convert \"{value}\" into {typeof(Type)}", node);
+		}
+	}
+
+}
\ No newline at end of file
diff --git a/Xamarin.Forms.Build.Tasks/Xamarin.Forms.Build.Tasks.csproj b/Xamarin.Forms.Build.Tasks/Xamarin.Forms.Build.Tasks.csproj
index 589d0062..ef10720d 100644
--- a/Xamarin.Forms.Build.Tasks/Xamarin.Forms.Build.Tasks.csproj
+++ b/Xamarin.Forms.Build.Tasks/Xamarin.Forms.Build.Tasks.csproj
@@ -104,6 +104,7 @@
     <Compile Include="CompiledConverters\ConstraintTypeConverter.cs" />
     <Compile Include="CompiledConverters\ThicknessTypeConverter.cs" />
     <Compile Include="MethodBodyExtensions.cs" />
+    <Compile Include="CompiledConverters\TypeTypeConverter.cs" />
   </ItemGroup>
   <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />
   <Target Name="AfterBuild">