[objc] Add error handling. (#33)

docs/error.md

@@ -0,0 +1,40 @@
+id:{932C3F0C-D968-42D1-BB14-D97C73361983}
+title:Embeddinator-4000 errors
+
+[//]: # (The original file resides under https://github.com/mono/Embeddinator-4000/tree/master/docs/error.md)
+[//]: # (This allows all contributors (including external) to submit, using a PR, updates to the documentation that match the tools changes)
+[//]: # (Modifications outside of mono/Embeddinator-4000 will be lost on future updates)
+
+# EM0xxx: binding error messages
+
+E.g. parameters, environment
+
+<!-- 0xxx: the generator itself, e.g. parameters, environment -->
+<h3><a name="EM0000"/>EM0000: Unexpected error - Please fill a bug report at https://github.com/mono/Embeddinator-4000/issues</h3>
+
+An unexpected error condition occurred. Please [file an issue](https://github.com/mono/Embeddinator-4000/issues) with as much information as possible, including:
+
+* Full build logs, with maximum verbosity
+* A minimal test case that reproduce the error
+* All version informations
+
+The easiest way to get exact version information is to use the **Xamarin Studio** menu, **About Xamarin Studio** item, **Show Details** button and copy/paste the version informations (you can use the **Copy Information** button).
+
+<h3><a name="EM0099"/>EM0099: Internal error *. Please file a bug report with a test case (https://github.com/mono/Embeddinator-4000/issues).</h3>
+
+This error message is reported when an internal consistency check in the Embeddinator-4000 fails.
+
+This indicates a bug in the Embeddinator-4000; please file a bug report at [https://github.com/mono/Embeddinator-4000/issues](https://github.com/mono/Embeddinator-4000/issues) with a test case.
+
+# EM1xxx: code generation
+
+<!-- 1xxx: code generation -->
+
+<!-- 2xxx: reserved -->
+<!-- 3xxx: reserved -->
+<!-- 4xxx: reserved -->
+<!-- 5xxx: reserved -->
+<!-- 6xxx: reserved -->
+<!-- 7xxx: reserved -->
+<!-- 8xxx: reserved -->
+<!-- 9xxx: reserved -->

objcgen/ErrorHelper.cs

@@ -0,0 +1,176 @@
+// Copyright 2014, Xamarin Inc. All rights reserved,
+
+using System;
+using System.Collections.Generic;
+
+using ProductException = Embeddinator.EmbeddinatorException;
+
+namespace Embeddinator
+{
+	static class ErrorHelper
+	{
+		public enum WarningLevel
+		{
+			Error = -1,
+			Warning = 0,
+			Disable = 1,
+		}
+		const string Prefix = ProductException.PREFIX;
+		static Dictionary<int, WarningLevel> warning_levels;
+		public static int Verbosity { get; set; }
+
+		public static WarningLevel GetWarningLevel (int code)
+		{
+			WarningLevel level;
+
+			if (warning_levels == null)
+				return WarningLevel.Warning;
+
+			// code -1: all codes
+			if (warning_levels.TryGetValue (-1, out level))
+				return level;
+
+			if (warning_levels.TryGetValue (code, out level))
+				return level;
+
+			return WarningLevel.Warning; ;
+		}
+
+		public static void SetWarningLevel (WarningLevel level, int? code = null /* if null, apply to all warnings */)
+		{
+			if (warning_levels == null)
+				warning_levels = new Dictionary<int, WarningLevel> ();
+			if (code.HasValue) {
+				warning_levels [code.Value] = level;
+			} else {
+				warning_levels [-1] = level; // code -1: all codes.
+			}
+		}
+
+		public static ProductException CreateError (int code, string message, params object [] args)
+		{
+			return new ProductException (code, true, message, args);
+		}
+
+		public static ProductException CreateError (int code, Exception innerException, string message, params object [] args)
+		{
+			return new ProductException (code, true, innerException, message, args);
+		}
+
+		public static ProductException CreateWarning (int code, string message, params object [] args)
+		{
+			return new ProductException (code, false, message, args);
+		}
+
+		public static void Error (int code, Exception innerException, string message, params object [] args)
+		{
+			throw new ProductException (code, true, innerException, message, args);
+		}
+
+		public static void Error (int code, string message, params object [] args)
+		{
+			throw new ProductException (code, true, message, args);
+		}
+
+		public static void Warning (int code, string message, params object [] args)
+		{
+			Show (new ProductException (code, false, message, args));
+		}
+
+		public static void Warning (int code, Exception innerException, string message, params object [] args)
+		{
+			Show (new ProductException (code, false, innerException, message, args));
+		}
+
+		public static void Show (IEnumerable<Exception> list)
+		{
+			List<Exception> exceptions = new List<Exception> ();
+			bool error = false;
+
+			foreach (var e in list)
+				CollectExceptions (e, exceptions);
+
+			foreach (var ex in exceptions)
+				error |= ShowInternal (ex);
+
+			if (error)
+				Exit (1);
+		}
+
+		static public void Show (Exception e)
+		{
+			List<Exception> exceptions = new List<Exception> ();
+			bool error = false;
+
+			CollectExceptions (e, exceptions);
+
+			foreach (var ex in exceptions)
+				error |= ShowInternal (ex);
+
+			if (error)
+				Exit (1);
+		}
+
+		static void Exit (int exitCode)
+		{
+			Environment.Exit (exitCode);
+		}
+
+		static void CollectExceptions (Exception ex, List<Exception> exceptions)
+		{
+			AggregateException ae = ex as AggregateException;
+
+			if (ae != null) {
+				foreach (var ie in ae.InnerExceptions)
+					CollectExceptions (ie, exceptions);
+			} else {
+				exceptions.Add (ex);
+			}
+		}
+
+		static bool ShowInternal (Exception e)
+		{
+			ProductException mte = (e as ProductException);
+			bool error = true;
+
+			if (mte != null) {
+				error = mte.Error;
+
+				if (!error && GetWarningLevel (mte.Code) == WarningLevel.Disable)
+					return false; // This is an ignored warning.
+
+				Console.Error.WriteLine (mte.ToString ());
+
+				if (Verbosity > 1)
+					ShowInner (e);
+
+				if (Verbosity > 2 && !string.IsNullOrEmpty (e.StackTrace))
+					Console.Error.WriteLine (e.StackTrace);
+			} else {
+				Console.Error.WriteLine (e.ToString ());
+				if (Verbosity > 1)
+					ShowInner (e);
+				if (Verbosity > 2 && !string.IsNullOrEmpty (e.StackTrace))
+					Console.Error.WriteLine (e.StackTrace);
+			}
+
+			return error;
+		}
+
+		static void ShowInner (Exception e)
+		{
+			Exception ie = e.InnerException;
+			if (ie == null)
+				return;
+
+			if (Verbosity > 3) {
+				Console.Error.WriteLine ("--- inner exception");
+				Console.Error.WriteLine (ie);
+				Console.Error.WriteLine ("---");
+			} else {
+				Console.Error.WriteLine ("\t{0}", ie.Message);
+			}
+			ShowInner (ie);
+		}
+	}
+}

objcgen/driver.cs

@@ -13,8 +13,18 @@ namespace Embeddinator {
 	static class Driver {
 
 		// TODO: use Mono.Options
-		// TODO: add errors.cs
+
-		public static int Main (string [] args)
+		static int Main (string [] args)
+		{
+			try {
+				return Main2 (args);
+			} catch (Exception e) {
+				ErrorHelper.Show (e);
+				return 1;
+			}
+		}
+
+		public static int Main2 (string [] args)
 		{
 			bool shared = true; // dylib
 

objcgen/error.cs

@@ -0,0 +1,49 @@
+// Copyright 2011-2012, Xamarin Inc. All rights reserved,
+
+using System;
+using System.Collections.Generic;
+
+// Error allocation: the errors are listed (and documented) in $(TOP)/docs/errors.md
+
+namespace Embeddinator
+{
+	public class EmbeddinatorException : Exception
+	{
+		internal const string PREFIX = "EM";
+
+		public EmbeddinatorException (int code, string message, params object [] args) :
+			this (code, true, message, args)
+		{
+		}
+
+		public EmbeddinatorException (int code, bool error, string message, params object [] args) :
+			this (code, error, null, message, args)
+		{
+		}
+
+		public EmbeddinatorException (int code, bool error, Exception innerException, string message, params object [] args) :
+			base (String.Format (message, args), innerException)
+		{
+			Code = code;
+			Error = error || ErrorHelper.GetWarningLevel (code) == ErrorHelper.WarningLevel.Error;
+		}
+
+		public string FileName { get; set; }
+
+		public int LineNumber { get; set; }
+
+		public int Code { get; private set; }
+
+		public bool Error { get; private set; }
+
+		// http://blogs.msdn.com/b/msbuild/archive/2006/11/03/msbuild-visual-studio-aware-error-messages-and-message-formats.aspx
+		public override string ToString ()
+		{
+			if (string.IsNullOrEmpty (FileName)) {
+				return String.Format ("{0} {3}{1:0000}: {2}", Error ? "error" : "warning", Code, Message, PREFIX);
+			} else {
+				return String.Format ("{3}({4}): {0} {5}{1:0000}: {2}", Error ? "error" : "warning", Code, Message, FileName, LineNumber, PREFIX);
+			}
+		}
+	}
+}

objcgen/objcgen.csproj

@@ -303,6 +303,8 @@
     <Compile Include="..\external\ikvm\reflect\Writer\VersionInfo.cs">
       <Link>ikvm\VersionInfo.cs</Link>
     </Compile>
+    <Compile Include="error.cs" />
+    <Compile Include="ErrorHelper.cs" />
   </ItemGroup>
   <ItemGroup>
     <Folder Include="support\" />
@@ -331,6 +333,9 @@
   </ItemGroup>
   <ItemGroup>
     <None Include="packages.config" />
+    <None Include="..\docs\error.md">
+      <Link>error.md</Link>
+    </None>
   </ItemGroup>
   <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />
 </Project>

objcgen/objcgenerator.cs

@@ -140,7 +140,7 @@ namespace ObjC {
 			var setter = pi.GetSetMethod ();
 			// FIXME: setter only is valid, even if discouraged, in .NET - we should create a SetX method
 			if (getter == null && setter != null)
-				throw new NotSupportedException ();
+				throw ErrorHelper.CreateError (99, "Internal error. Please file a bug report with a test case (https://github.com/mono/Embeddinator-4000/issues).");
 
 			// TODO override with attribute ? e.g. [ObjC.Selector ("foo")]
 			var name = CamelCase (pi.Name);
@@ -204,7 +204,7 @@ namespace ObjC {
 				implementation.WriteLine ($"\treturn *(({name}*)__unbox);");
 				break;
 			default:
-				throw new NotSupportedException ();
+				throw ErrorHelper.CreateError (99, "Internal error. Please file a bug report with a test case (https://github.com/mono/Embeddinator-4000/issues).");
 			}
 		}
 
@@ -232,7 +232,7 @@ namespace ObjC {
 			case TypeCode.Int32:
 				return "int";
 			default:
-				throw new NotSupportedException ();
+				throw ErrorHelper.CreateError (99, "Internal error. Please file a bug report with a test case (https://github.com/mono/Embeddinator-4000/issues).");
 			}
 		}
 

tests/objcgentest/ObjCGeneratorTest.cs

@@ -29,5 +29,14 @@ namespace ObjCGeneratorTest {
 			Assert.That (ObjCGenerator.GetTypeName (asm.GetType ("System.Int32")), Is.EqualTo ("int"), "int");
 			Assert.That (ObjCGenerator.GetTypeName (asm.GetType ("System.Object")), Is.EqualTo ("NSObject"), "object");
 		}
+
+		[Test]
+		public void TypeMatchFailure ()
+		{
+			var universe = new Universe (UniverseOptions.None);
+			var asm = universe.Load ("mscorlib.dll");
+
+			Assert.Throws<Embeddinator.EmbeddinatorException> (() => ObjCGenerator.GetTypeName (asm.GetType ("System.Char")), "char");
+		}
 	}
 }