Completed the support for multiple inheritance with the exception of base interfaces and the cast operator in the derived class to the second or later base.

Signed-off-by: Dimitar Dobrev <dpldobrev@yahoo.com>

src/AST/Class.cs

@@ -82,6 +82,8 @@ namespace CppSharp.AST
         // True if class provides pure virtual methods.
         public bool IsAbstract;
 
+        public bool IsInterface { get; set; }
+
         // True if the type is to be treated as a union.
         public bool IsUnion;
 

src/AST/Property.cs

@@ -7,6 +7,30 @@ namespace CppSharp.AST
     /// </summary>
     public class Property : Declaration, ITypedDecl
     {
+        public Property()
+        {
+        }
+
+        public Property(Property property)
+            : base(property)
+        {
+            QualifiedType = property.QualifiedType;
+            if (property.GetMethod != null)
+                GetMethod = new Method(property.GetMethod);
+            if (property.GetMethod == property.SetMethod)
+            {
+                SetMethod = GetMethod;
+            }
+            else
+            {
+                if (property.SetMethod != null)
+                    SetMethod = new Method(property.SetMethod);
+            }
+            if (property.Field != null)
+                Field = property.Field;
+            parameters.AddRange(property.Parameters);
+        }
+
         public Type Type
         {
             get { return QualifiedType.Type; }

src/Generator/Generators/CSharp/CSharpTextTemplate.cs

@@ -30,8 +30,7 @@ namespace CppSharp.Generators.CSharp
 
         public static string SafeIdentifier(string id)
         {
-            id = new string(((IEnumerable<char>)id)
-                .Select(c => char.IsLetterOrDigit(c) ? c : '_').ToArray());
+            id = new string(id.Select(c => char.IsLetterOrDigit(c) ? c : '_').ToArray());
             return Keywords.Contains(id) ? "@" + id : id;
         }
 
@@ -220,7 +219,10 @@ namespace CppSharp.Generators.CSharp
                 if (@class.IsDependent)
                     continue;
 
-                GenerateClass(@class);
+                if (@class.IsInterface)
+                    GenerateInterface(@class);
+                else
+                    GenerateClass(@class);
             }
 
             if (context.HasFunctions)
@@ -356,6 +358,80 @@ namespace CppSharp.Generators.CSharp
             PopBlock(NewLineKind.BeforeNextBlock);
         }
 
+        private void GenerateInterface(Class @class)
+        {
+            if (@class.Ignore || @class.IsIncomplete)
+                return;
+
+            PushBlock(CSharpBlockKind.Class);
+            GenerateDeclarationCommon(@class);
+
+            Write(Helpers.GetAccess(@class));
+            Write("unsafe ");
+
+            if (Options.GeneratePartialClasses)
+                Write("partial ");
+
+            Write("interface ");
+            Write("{0}", SafeIdentifier(@class.Name));
+
+            //var needsBase = @class.HasBaseClass && !@class.IsValueType
+            //    && !@class.Bases[0].Class.IsValueType
+            //    && !@class.Bases[0].Class.Ignore;
+
+            //if (needsBase || @class.IsRefType)
+            //    Write(" : ");
+
+            //if (needsBase)
+            //{
+            //    var qualifiedBase = QualifiedIdentifier(@class.Bases[0].Class);
+            //    Write("{0}", qualifiedBase);
+
+            //    if (@class.IsRefType)
+            //        Write(", ");
+            //}
+
+            NewLine();
+            WriteStartBraceIndent();
+
+            GenerateDeclContext(@class);
+
+            foreach (var method in @class.Methods.Where(m => !ASTUtils.CheckIgnoreMethod(m)))
+            {
+                PushBlock(CSharpBlockKind.Method);
+                GenerateDeclarationCommon(method);
+
+                var functionName = GetFunctionIdentifier(method);
+
+                Write("{0} {1}(", method.OriginalReturnType, functionName);
+
+                Write(FormatMethodParameters(method.Parameters));
+
+                Write(");");
+                NewLine();
+
+                PopBlock(NewLineKind.BeforeNextBlock);
+            }
+            foreach (var prop in @class.Properties.Where(p => !p.Ignore))
+            {
+                PushBlock(CSharpBlockKind.Property);
+                var type = prop.Type;
+                if (prop.Parameters.Count > 0 && prop.Type.IsPointerToPrimitiveType())
+                    type = ((PointerType) prop.Type).Pointee;
+                Write("{0} {1} {{ ", type, GetPropertyName(prop));
+                if (prop.HasGetter)
+                    Write("get; ");
+                if (prop.HasSetter)
+                    Write("set; ");
+
+                WriteLine("}");
+                PopBlock(NewLineKind.BeforeNextBlock);
+            }
+
+            WriteCloseBraceIndent();
+            PopBlock(NewLineKind.BeforeNextBlock);
+        }
+
         private void GenerateValueClassFields(Class @class)
         {
             GenerateClassFields(@class, field =>
@@ -610,7 +686,7 @@ namespace CppSharp.Generators.CSharp
                 baseClass = @class.Bases[0].Class;
 
             var hasRefBase = baseClass != null && baseClass.IsRefType
-                             && !baseClass.Ignore;
+                             && !baseClass.Ignore && !baseClass.IsInterface;
 
             var hasIgnoredBase = baseClass != null && baseClass.Ignore;
 
@@ -643,8 +719,9 @@ namespace CppSharp.Generators.CSharp
 
             if (needsBase)
             {
-                var qualifiedBase = QualifiedIdentifier(@class.Bases[0].Class);
-                Write("{0}", qualifiedBase);
+                Write("{0}", string.Join(", ",
+                    from @base in @class.Bases
+                    select QualifiedIdentifier(@base.Class)));
 
                 if (@class.IsRefType)
                     Write(", ");
@@ -1360,7 +1437,8 @@ namespace CppSharp.Generators.CSharp
 
         private void GenerateDisposeMethods(Class @class)
         {
-            var hasBaseClass = @class.HasBaseClass && @class.BaseClass.IsRefType;
+            var hasBaseClass = @class.HasBaseClass && @class.BaseClass.IsRefType &&
+                               !@class.BaseClass.IsInterface;
 
             // Generate the IDispose Dispose() method.
             if (!hasBaseClass)
@@ -1429,7 +1507,8 @@ namespace CppSharp.Generators.CSharp
             WriteLine("internal {0}(global::System.IntPtr native){1}", safeIdentifier,
                 @class.IsValueType ? " : this()" : string.Empty);
 
-            var hasBaseClass = @class.HasBaseClass && @class.BaseClass.IsRefType;
+            var hasBaseClass = @class.HasBaseClass && @class.BaseClass.IsRefType &&
+                               !@class.BaseClass.IsInterface;
             if (hasBaseClass)
                 WriteLineIndent(": base(native)");
 
@@ -1523,14 +1602,18 @@ namespace CppSharp.Generators.CSharp
             PushBlock(CSharpBlockKind.Method);
             GenerateDeclarationCommon(method);
 
-            switch (GetValidMethodAccess(method, @class))
+            // check if this is an explicit interface implementation
+            if (!method.Name.Contains('.'))
             {
-                case AccessSpecifier.Public:
-                    Write("public ");
-                    break;
-                case AccessSpecifier.Protected:
-                    Write("protected ");
-                    break;
+                switch (GetValidMethodAccess(method, @class))
+                {
+                    case AccessSpecifier.Public:
+                        Write("public ");
+                        break;
+                    case AccessSpecifier.Protected:
+                        Write("protected ");
+                        break;
+                }
             }
 
             if (method.IsVirtual && !method.IsOverride &&
@@ -1549,7 +1632,8 @@ namespace CppSharp.Generators.CSharp
             if (Driver.Options.GenerateAbstractImpls && method.IsPure)
                 Write("abstract ");
 
-            var functionName = GetFunctionIdentifier(method);
+            var functionName = method.IsOperator ?
+                Operators.GetOperatorIdentifier(method.OperatorKind) : method.Name;
 
             if (method.IsConstructor || method.IsDestructor)
                 Write("{0}(", functionName);

src/Generator/Passes/MultipleInheritancePass.cs

@@ -25,18 +25,53 @@ namespace CppSharp.Passes
             for (int i = 1; i < @class.Bases.Count; i++)
             {
                 var @base = @class.Bases[i].Class;
+                if (@base.IsInterface) continue;
+
+                if (@base.CompleteDeclaration != null)
+                    @base = (Class) @base.CompleteDeclaration;
                 var name = "I" + @base.Name;
-                if (!interfaces.ContainsKey(@base) && @base.Namespace.Classes.All(c => c.Name != name))
-                {
-                    Class @interface = new Class { Name = name, Namespace = @class.Namespace };
-                    @interface.IsAbstract = true;
-                    @interface.Methods.AddRange(@class.Methods);
-                    @interface.Properties.AddRange(@class.Properties);
-                    @interface.Events.AddRange(@class.Events);
-                    @interfaces.Add(@class, @interface);
-                }
+                var @interface = (interfaces.ContainsKey(@base)
+                    ? interfaces[@base]
+                    : @base.Namespace.Classes.FirstOrDefault(c => c.Name == name)) ??
+                                 GetNewInterface(@class, name, @base);
+                @class.Bases[i] = new BaseClassSpecifier { Type = new TagType(@interface) };
             }
             return base.VisitClassDecl(@class);
         }
+
+        private Class GetNewInterface(Class @class, string name, Class @base)
+        {
+            var @interface = new Class
+                {
+                    Name = name,
+                    Namespace = @base.Namespace,
+                    Access = @base.Access,
+                    IsInterface = true
+                };
+            @interface.Methods.AddRange(@base.Methods.Where(
+                m => !m.IsConstructor && !m.IsDestructor && !m.IsStatic && !m.Ignore));
+            foreach (var method in @interface.Methods)
+            {
+                var impl = new Method(method)
+                    {
+                        Namespace = @class,
+                        IsVirtual = false,
+                        IsOverride = false
+                    };
+                var rootBaseMethod = @class.GetRootBaseMethod(method);
+                if (rootBaseMethod != null && !rootBaseMethod.Ignore)
+                    impl.Name = @interface.Name + "." + impl.Name;
+                @class.Methods.Add(impl);
+            }
+            @interface.Properties.AddRange(@base.Properties.Where(p => !p.Ignore));
+            @class.Properties.AddRange(
+                from property in @interface.Properties
+                select new Property(property) { Namespace = @class });
+            @interface.Events.AddRange(@base.Events);
+            if (@base.Bases.All(b => b.Class != @interface))
+                @base.Bases.Add(new BaseClassSpecifier { Type = new TagType(@interface) });
+            interfaces.Add(@base, @interface);
+            return @interface;
+        }
     }
 }

tests/CSharpTemp/CSharpTemp.Tests.cs

@@ -30,4 +30,12 @@ public class CSharpTempTests
         Assert.That(typeof(Foo).GetProperty("P",
             BindingFlags.Instance | BindingFlags.NonPublic), Is.Not.Null);
     }
+
+    [Test]
+    public void TestMultipleInheritance()
+    {
+        Baz baz = new Baz();
+        Assert.That(baz.method(), Is.EqualTo(1));
+        Assert.That(((IBar) baz).method(), Is.EqualTo(2));
+    }
 }

tests/CSharpTemp/CSharpTemp.cpp

@@ -6,6 +6,11 @@ Foo::Foo()
     P = 50;
 }
 
+int Foo::method()
+{
+    return 1;
+}
+
 int Foo::operator[](int i) const
 {
     return 5;
@@ -26,6 +31,11 @@ const Foo& Bar::operator[](int i) const
     return m_foo;
 }
 
+int Bar::method()
+{
+    return 2;
+}
+
 Foo& Bar::operator[](int i)
 {
     return m_foo;

tests/CSharpTemp/CSharpTemp.h

@@ -8,6 +8,7 @@ class DLL_API Foo
 {
 public:
     Foo();
+    int method();
     int operator[](int i) const;
     int operator[](unsigned int i);
     int& operator[](int i);
@@ -20,9 +21,15 @@ protected:
 class DLL_API Bar
 {
 public:
+    int method();
     const Foo& operator[](int i) const;
     Foo& operator[](int i);
 
 private:
     Foo m_foo;
 };
+
+class DLL_API Baz : public Foo, public Bar
+{
+
+};