From 4feaf14c55d4062d6e52c422c3661699737de33d Mon Sep 17 00:00:00 2001
From: Stephane Delcroix <stephane@delcroix.org>
Date: Fri, 29 Sep 2017 09:04:27 +0200
Subject: [PATCH] [XamlC] Compiled UriTypeConverter (#1166)

---
 .../CompiledConverters/UriTypeConverter.cs    | 28 +++++++++++++++++++
 .../Xamarin.Forms.Build.Tasks.csproj          |  1 +
 Xamarin.Forms.Core/UriTypeConverter.cs        |  1 +
 3 files changed, 30 insertions(+)
 create mode 100644 Xamarin.Forms.Build.Tasks/CompiledConverters/UriTypeConverter.cs

diff --git a/Xamarin.Forms.Build.Tasks/CompiledConverters/UriTypeConverter.cs b/Xamarin.Forms.Build.Tasks/CompiledConverters/UriTypeConverter.cs
new file mode 100644
index 000000000..534a8bada
--- /dev/null
+++ b/Xamarin.Forms.Build.Tasks/CompiledConverters/UriTypeConverter.cs
@@ -0,0 +1,28 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+
+using Mono.Cecil;
+using Mono.Cecil.Cil;
+using Xamarin.Forms.Xaml;
+
+namespace Xamarin.Forms.Core.XamlC
+{
+	class UriTypeConverter : ICompiledTypeConverter
+	{
+		public IEnumerable<Instruction> ConvertFromString(string value, ModuleDefinition module, BaseNode node)
+		{
+			if (string.IsNullOrWhiteSpace(value)) {
+				yield return Instruction.Create(OpCodes.Ldnull);
+				yield break;
+			}
+
+			var uriCtor = module.ImportReference(typeof(Uri)).Resolve().Methods.FirstOrDefault(md => md.IsConstructor && md.Parameters.Count == 2 && md.Parameters[1].ParameterType.FullName == "System.UriKind");
+			var uriCtorRef = module.ImportReference(uriCtor);
+
+			yield return Instruction.Create(OpCodes.Ldstr, value);
+			yield return Instruction.Create(OpCodes.Ldc_I4_0); //UriKind.RelativeOrAbsolute
+			yield return Instruction.Create(OpCodes.Newobj, uriCtorRef);
+		}
+	}
+}
\ 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 a4895c5c5..0560267d2 100644
--- a/Xamarin.Forms.Build.Tasks/Xamarin.Forms.Build.Tasks.csproj
+++ b/Xamarin.Forms.Build.Tasks/Xamarin.Forms.Build.Tasks.csproj
@@ -112,6 +112,7 @@
     <Compile Include="CompiledMarkupExtensions\TypeExtension.cs" />
     <Compile Include="CompiledMarkupExtensions\NullExtension.cs" />
     <Compile Include="GetTasksAbi.cs" />
+    <Compile Include="CompiledConverters\UriTypeConverter.cs" />
   </ItemGroup>
   <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />
   <Target Name="AfterBuild">
diff --git a/Xamarin.Forms.Core/UriTypeConverter.cs b/Xamarin.Forms.Core/UriTypeConverter.cs
index 0a24cab3e..fca35705f 100644
--- a/Xamarin.Forms.Core/UriTypeConverter.cs
+++ b/Xamarin.Forms.Core/UriTypeConverter.cs
@@ -2,6 +2,7 @@
 
 namespace Xamarin.Forms
 {
+	[Xaml.ProvideCompiled("Xamarin.Forms.Core.XamlC.UriTypeConverter")]
 	public class UriTypeConverter : TypeConverter
 	{
 		public override object ConvertFromInvariantString(string value)