generator: Added conversion for unions

Also removed all assumptions for parameters when
ParserVersion >= 3

generator/Makefile.am

@@ -64,6 +64,7 @@ sources = 				\
 	StructField.cs			\
 	StructGen.cs			\
 	SymbolTable.cs			\
+	UnionGen.cs			\
 	VirtualMethod.cs		\
 	VMSignature.cs			\
 	XmlElementExtensions.cs

generator/Parameters.cs

@@ -93,24 +93,24 @@ namespace GtkSharp.Generation {
 
 			if (HasCB || HideData) {
 
+				if (Parser.GetVersion (elem.OwnerDocument.DocumentElement) >= 3) {
 					foreach (Parameter param in param_list) {
 						if (param.Closure == idx)
 							return true;
-					else if (param.DestroyNotify == idx)
+						if (param.DestroyNotify == idx)
 							return true;
 					}
-
+				} else {
 					if (p.IsUserData && (idx == Count - 1))
 						return true;
 					if (p.IsUserData && (idx == Count - 2) && this [Count - 1] is ErrorParameter)
 						return true;
-				if (p.IsUserData && idx > 0 &&
+					if (p.IsUserData && idx > 0 && this [idx - 1].Generatable is CallbackGen)
-				    this [idx - 1].Generatable is CallbackGen)
 						return true;
-				if (p.IsDestroyNotify && (idx == Count - 1) &&
+					if (p.IsDestroyNotify && (idx == Count - 1) && this [idx - 1].IsUserData)
-				    this [idx - 1].IsUserData)
 						return true;
 				}
+			}
 
 			return false;
 		}
@@ -234,7 +234,8 @@ namespace GtkSharp.Generation {
 				param_list.Add (p);
 			}
 
-			if (has_cb && Count > 2 && this [Count - 3].Generatable is CallbackGen && this [Count - 2].IsUserData && this [Count - 1].IsDestroyNotify)
+			if (Parser.GetVersion (elem.OwnerDocument.DocumentElement) < 3 &&
+			    has_cb && Count > 2 && this [Count - 3].Generatable is CallbackGen && this [Count - 2].IsUserData && this [Count - 1].IsDestroyNotify)
 				this [Count - 3].Scope = "notified";
 
 			valid = true;

generator/Parser.cs

@@ -171,6 +171,9 @@ namespace GtkSharp.Generation {
 				case "class":
 					result.Add (new ClassGen (ns, elem));
 					break;
+				case "union":
+					result.Add (new UnionGen (ns, elem));
+					break;
 				case "struct":
 					if (is_opaque) {
 						result.Add (new OpaqueGen (ns, elem));

generator/StructBase.cs

@@ -110,6 +110,12 @@ namespace GtkSharp.Generation {
 			}
 		}
 
+		public virtual bool Union {
+			get {
+				return false;
+			}
+		}
+
 		protected void GenEqualsAndHash (StreamWriter sw)
 		{
 			int bitfields = 0;
@@ -172,12 +178,13 @@ namespace GtkSharp.Generation {
 		{
 			int bitfields = 0;
 			bool need_field = true;
-
-			foreach (StructField field in fields) {
-				if (field.IsBitfield) {
-					if (need_field) {
 			StreamWriter sw = gen_info.Writer;
 
+			foreach (StructField field in fields) {
+				if (Union)
+					sw.WriteLine ("\t\t[FieldOffset(0)]");
+				if (field.IsBitfield) {
+					if (need_field) {
 						sw.WriteLine ("\t\tprivate uint _bitfield{0};\n", bitfields++);
 						need_field = false;
 					}
@@ -221,6 +228,9 @@ namespace GtkSharp.Generation {
 			sw.WriteLine ("#region Autogenerated code");
 			if (IsDeprecated)
 				sw.WriteLine ("\t[Obsolete]");
+			if (Union)
+				sw.WriteLine ("\t[StructLayout(LayoutKind.Explicit)]");
+			else
 				sw.WriteLine ("\t[StructLayout(LayoutKind.Sequential)]");
 			string access = IsInternal ? "internal" : "public";
 			sw.WriteLine ("\t" + access + " partial struct {0} : IEquatable<{0}> {{", Name);

generator/StructField.cs

@@ -80,7 +80,7 @@ namespace GtkSharp.Generation {
 					return StudlyName;
 				else if (IsBitfield)
 					return Name;
-				else if (IsPointer && (gen is StructGen || gen is BoxedGen))
+				else if (IsPointer && (gen is StructGen || gen is BoxedGen || gen is UnionGen))
 					return Access != "private" ? wrapped_name : Name;
 				else if (IsPointer && CSType != "string")
 					return Name;
@@ -148,7 +148,7 @@ namespace GtkSharp.Generation {
 					acc.WriteAccessors (sw, indent + "\t", Name);
 					sw.WriteLine (indent + "}");
 				}
-			} else if (IsPointer && (gen is StructGen || gen is BoxedGen)) {
+			} else if (IsPointer && (gen is StructGen || gen is BoxedGen || gen is UnionGen)) {
 				sw.WriteLine (indent + "private {0} {1};", CSType, Name);
 				sw.WriteLine ();
 				if (Access != "private") {

generator/SymbolTable.cs

@@ -293,6 +293,13 @@ namespace GtkSharp.Generation {
 			return false;
 		}
 
+		public bool IsUnion (string c_type)
+		{
+			if (this[c_type] is UnionGen)
+				return true;
+			return false;
+		}
+	
 		public bool IsEnum(string c_type)
 		{
 			if (this[c_type] is EnumGen)

generator/UnionGen.cs

@@ -0,0 +1,18 @@
+
+using System.Xml;
+
+namespace GtkSharp.Generation
+{
+	public class UnionGen : StructBase {
+
+		public UnionGen (XmlElement ns, XmlElement elem) : base (ns, elem)
+		{
+		}
+
+		public override bool Union {
+			get {
+				return true;
+			}
+		}
+	}
+}

generator/generator.csproj

@@ -92,6 +92,7 @@
     <Compile Include="ArrayParameter.cs" />
     <Compile Include="Options.cs" />
     <Compile Include="Constant.cs" />
+    <Compile Include="UnionGen.cs" />
   </ItemGroup>
   <ItemGroup>
     <None Include="DESIGN" />