use a connected type rather than one single type (#201)

* use a connected type rather than one single type

* remove makefromabi file

Author: stevenbrix

Diff for: swiftwinrt/Resources/Support/MakeFromAbi.swift

@@ -4,14 +4,15 @@ import Foundation
 // when we cast to `any MakeFromAbi`, plus that requires a lot more exported
 // simples than we want
 public protocol MakeFromAbi {
-    static func from(typeName: String, abi: SUPPORT_MODULE.IInspectable) -> Any?
+    associatedtype SwiftType
+    static func from(abi: SUPPORT_MODULE.IInspectable) -> SwiftType
 }
 
 func make(typeName: SwiftTypeName, from abi: SUPPORT_MODULE.IInspectable) -> Any? {
-    guard let makerType = NSClassFromString("\(typeName.module).__MakeFromAbi") as? any MakeFromAbi.Type else {
+    guard let makerType = NSClassFromString("\(typeName.module).\(typeName.typeName)Maker") as? any MakeFromAbi.Type else {
         return nil
     }
-    return makerType.from(typeName: typeName.typeName, abi: abi)
+    return makerType.from(abi: abi)
 }
 
 func makeFrom(abi: SUPPORT_MODULE.IInspectable) -> Any? {

Diff for: swiftwinrt/code_writers.h

@@ -1203,31 +1203,37 @@ bind_bridge_fullname(type));
         return true;
     }
 
-    static void write_make_from_abi_case(writer& w, metadata_type const& type)
-    {
-        if (skip_write_from_abi(w, type)) return;
-        w.write("case \"%\": return make%From(abi: abi)\n", type.swift_type_name(), type.swift_type_name());
-    }
-
     static void write_make_from_abi(writer& w, metadata_type const& type)
     {
         if (skip_write_from_abi(w, type)) return;
 
-        w.write("fileprivate func make%From(abi: %.IInspectable) -> Any {\n", type.swift_type_name(), w.support);
-
+        std::string fromAbi;
+        std::string swiftType;
         if (is_interface(type))
         {
-            auto indent = w.push_indent();
-            w.write("let swiftAbi: %.% = try! abi.QueryInterface()\n", abi_namespace(type),
+            fromAbi = w.write_temp("let swiftAbi: %.% = try! abi.QueryInterface()\n", abi_namespace(type),
                 type.swift_type_name());
-            w.write("return %.from(abi: RawPointer(swiftAbi))!\n", bind_bridge_fullname(type));
+            fromAbi += w.write_temp("        return %.from(abi: RawPointer(swiftAbi))!", bind_bridge_fullname(type));
+            swiftType = w.write_temp("%", bind<write_swift_interface_existential_identifier>(type));
         }
         else if (is_class(&type))
         {
-            auto indent = w.push_indent();
-            w.write("return %(fromAbi: abi)\n", type.swift_type_name());
+            fromAbi = w.write_temp("return %(fromAbi: abi)", type.swift_type_name());
+            swiftType = w.write_temp("%", bind<write_swift_type_identifier>(type));
         }
-        w.write("}\n\n");
+        else
+        {
+            throw std::exception("Invalid type for MakeFromAbi");
+        }
+
+        w.write(R"(^@_spi(WinRTInternal)
+public class %Maker: MakeFromAbi {
+    public typealias SwiftType = %
+    public static func from(abi: %.IInspectable) -> SwiftType {
+        %
+    }
+}
+)", type.swift_type_name(), swiftType, w.support, fromAbi);
     }
 
     static void write_interface_bridge(writer& w, metadata_type const& type)

Diff for: swiftwinrt/file_writers.h

@@ -237,6 +237,10 @@ namespace swiftwinrt
 
         w.write("%", w.filter.bind_each<write_struct_bridgeable>(members.structs));
 
+        // MakeFromAbi has to be in impl file (or main file) otherwise they get stripped away
+        w.write("%", w.filter.bind_each<write_make_from_abi>(members.interfaces));
+        w.write("%", w.filter.bind_each<write_make_from_abi>(members.classes));
+
         w.swap();
         write_preamble(w, /* swift_code: */ true);
 
@@ -274,36 +278,4 @@ namespace swiftwinrt
         write_preamble(w, /* swift_code: */ true);
         w.save_file("Generics");
     }
-
-    static void write_module_make_from_abi(std::string_view const& module, type_cache const& members, include_only_used_filter const& filter)
-    {
-        writer w;
-        w.filter = filter;
-        w.support = settings.support;
-        w.c_mod = settings.get_c_module_name();
-        w.type_namespace = module;
-        w.swift_module = module;
-        w.cache = members.cache;
-        w.write("%", w.filter.bind_each<write_make_from_abi>(members.interfaces));
-        w.write("%", w.filter.bind_each<write_make_from_abi>(members.classes));
-
-        w.write("@_spi(__MakeFromAbi_DoNotImport)\n");
-        w.write("public class __MakeFromAbi: MakeFromAbi {\n");
-        w.write("    public static func from(typeName: String, abi: %.IInspectable) -> Any? {\n", w.support);
-        w.write("        switch typeName {\n");
-        {
-            auto indent_guard = w.push_indent(indent{ 3 });
-            w.write("%", w.filter.bind_each<write_make_from_abi_case>(members.interfaces));
-            w.write("%", w.filter.bind_each<write_make_from_abi_case>(members.classes));
-        }
-
-        w.write("            default: return nil\n");
-        w.write("        }\n");
-        w.write("    }\n");
-        w.write("}\n");
-
-        w.swap();
-        write_preamble(w, /* swift_code: */ true);
-        w.save_file("MakeFromAbi");
-    }
 }

Diff for: swiftwinrt/main.cpp

@@ -363,7 +363,6 @@ Where <spec> is one or more of:
                             // amount of code that is generated.
                             auto types = mdCache.compile_namespaces(namespaces, mf);
                             write_module_generics(module, types, mf);
-                            write_module_make_from_abi(module, types, mf);
                         });
 
                         if (module == settings.support)

Diff for: tests/test_component/Sources/test_component/Windows.Foundation+Impl.swift

@@ -547,3 +547,87 @@ extension TimeSpan: WinRTBridgeable {
     }
 }
 
+@_spi(WinRTInternal)
+public class IAsyncActionMaker: MakeFromAbi {
+    public typealias SwiftType = AnyIAsyncAction
+    public static func from(abi: test_component.IInspectable) -> SwiftType {
+        let swiftAbi: __ABI_Windows_Foundation.IAsyncAction = try! abi.QueryInterface()
+        return __IMPL_Windows_Foundation.IAsyncActionBridge.from(abi: RawPointer(swiftAbi))!
+    }
+}
+@_spi(WinRTInternal)
+public class IAsyncInfoMaker: MakeFromAbi {
+    public typealias SwiftType = AnyIAsyncInfo
+    public static func from(abi: test_component.IInspectable) -> SwiftType {
+        let swiftAbi: __ABI_Windows_Foundation.IAsyncInfo = try! abi.QueryInterface()
+        return __IMPL_Windows_Foundation.IAsyncInfoBridge.from(abi: RawPointer(swiftAbi))!
+    }
+}
+@_spi(WinRTInternal)
+public class IClosableMaker: MakeFromAbi {
+    public typealias SwiftType = AnyIClosable
+    public static func from(abi: test_component.IInspectable) -> SwiftType {
+        let swiftAbi: __ABI_Windows_Foundation.IClosable = try! abi.QueryInterface()
+        return __IMPL_Windows_Foundation.IClosableBridge.from(abi: RawPointer(swiftAbi))!
+    }
+}
+@_spi(WinRTInternal)
+public class IMemoryBufferMaker: MakeFromAbi {
+    public typealias SwiftType = AnyIMemoryBuffer
+    public static func from(abi: test_component.IInspectable) -> SwiftType {
+        let swiftAbi: __ABI_Windows_Foundation.IMemoryBuffer = try! abi.QueryInterface()
+        return __IMPL_Windows_Foundation.IMemoryBufferBridge.from(abi: RawPointer(swiftAbi))!
+    }
+}
+@_spi(WinRTInternal)
+public class IMemoryBufferReferenceMaker: MakeFromAbi {
+    public typealias SwiftType = AnyIMemoryBufferReference
+    public static func from(abi: test_component.IInspectable) -> SwiftType {
+        let swiftAbi: __ABI_Windows_Foundation.IMemoryBufferReference = try! abi.QueryInterface()
+        return __IMPL_Windows_Foundation.IMemoryBufferReferenceBridge.from(abi: RawPointer(swiftAbi))!
+    }
+}
+@_spi(WinRTInternal)
+public class IStringableMaker: MakeFromAbi {
+    public typealias SwiftType = AnyIStringable
+    public static func from(abi: test_component.IInspectable) -> SwiftType {
+        let swiftAbi: __ABI_Windows_Foundation.IStringable = try! abi.QueryInterface()
+        return __IMPL_Windows_Foundation.IStringableBridge.from(abi: RawPointer(swiftAbi))!
+    }
+}
+@_spi(WinRTInternal)
+public class IWwwFormUrlDecoderEntryMaker: MakeFromAbi {
+    public typealias SwiftType = AnyIWwwFormUrlDecoderEntry
+    public static func from(abi: test_component.IInspectable) -> SwiftType {
+        let swiftAbi: __ABI_Windows_Foundation.IWwwFormUrlDecoderEntry = try! abi.QueryInterface()
+        return __IMPL_Windows_Foundation.IWwwFormUrlDecoderEntryBridge.from(abi: RawPointer(swiftAbi))!
+    }
+}
+@_spi(WinRTInternal)
+public class DeferralMaker: MakeFromAbi {
+    public typealias SwiftType = Deferral
+    public static func from(abi: test_component.IInspectable) -> SwiftType {
+        return Deferral(fromAbi: abi)
+    }
+}
+@_spi(WinRTInternal)
+public class MemoryBufferMaker: MakeFromAbi {
+    public typealias SwiftType = MemoryBuffer
+    public static func from(abi: test_component.IInspectable) -> SwiftType {
+        return MemoryBuffer(fromAbi: abi)
+    }
+}
+@_spi(WinRTInternal)
+public class UriMaker: MakeFromAbi {
+    public typealias SwiftType = Uri
+    public static func from(abi: test_component.IInspectable) -> SwiftType {
+        return Uri(fromAbi: abi)
+    }
+}
+@_spi(WinRTInternal)
+public class WwwFormUrlDecoderMaker: MakeFromAbi {
+    public typealias SwiftType = WwwFormUrlDecoder
+    public static func from(abi: test_component.IInspectable) -> SwiftType {
+        return WwwFormUrlDecoder(fromAbi: abi)
+    }
+}

Diff for: tests/test_component/Sources/test_component/Windows.Foundation.Collections+Impl.swift

@@ -152,3 +152,40 @@ public enum __IMPL_Windows_Foundation_Collections {
     }
 
 }
+@_spi(WinRTInternal)
+public class IPropertySetMaker: MakeFromAbi {
+    public typealias SwiftType = AnyIPropertySet
+    public static func from(abi: test_component.IInspectable) -> SwiftType {
+        let swiftAbi: __ABI_Windows_Foundation_Collections.IPropertySet = try! abi.QueryInterface()
+        return __IMPL_Windows_Foundation_Collections.IPropertySetBridge.from(abi: RawPointer(swiftAbi))!
+    }
+}
+@_spi(WinRTInternal)
+public class IVectorChangedEventArgsMaker: MakeFromAbi {
+    public typealias SwiftType = AnyIVectorChangedEventArgs
+    public static func from(abi: test_component.IInspectable) -> SwiftType {
+        let swiftAbi: __ABI_Windows_Foundation_Collections.IVectorChangedEventArgs = try! abi.QueryInterface()
+        return __IMPL_Windows_Foundation_Collections.IVectorChangedEventArgsBridge.from(abi: RawPointer(swiftAbi))!
+    }
+}
+@_spi(WinRTInternal)
+public class PropertySetMaker: MakeFromAbi {
+    public typealias SwiftType = PropertySet
+    public static func from(abi: test_component.IInspectable) -> SwiftType {
+        return PropertySet(fromAbi: abi)
+    }
+}
+@_spi(WinRTInternal)
+public class StringMapMaker: MakeFromAbi {
+    public typealias SwiftType = StringMap
+    public static func from(abi: test_component.IInspectable) -> SwiftType {
+        return StringMap(fromAbi: abi)
+    }
+}
+@_spi(WinRTInternal)
+public class ValueSetMaker: MakeFromAbi {
+    public typealias SwiftType = ValueSet
+    public static func from(abi: test_component.IInspectable) -> SwiftType {
+        return ValueSet(fromAbi: abi)
+    }
+}