cxx-qt-gen: move QObject struct outside the bridge and use a type alias

Related to #559
KDAB · Jul 17, 2023 · fa089eb · fa089eb
1 parent f05b4a3
commit fa089eb
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -32,6 +32,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - `#[qinvokable]` is now defined as a signature in `extern "RustQt"`
 - `rust_mut` is now safe to call
 - `#[qproperty]` is now defined as an attribute on the qobject rather than the field
+- QObject struct is now split between the bridge and implementation outside via a type alias
 
 ### Fixed
 

diff --git a/crates/cxx-qt-gen/src/generator/cpp/mod.rs b/crates/cxx-qt-gen/src/generator/cpp/mod.rs
@@ -54,8 +54,10 @@ mod tests {
         let module: ItemMod = parse_quote! {
             #[cxx_qt::bridge]
             mod ffi {
-                #[cxx_qt::qobject]
-                pub struct MyObject;
+                extern "RustQt" {
+                    #[cxx_qt::qobject]
+                    type MyObject = super::MyObjectRust;
+                }
             }
         };
         let parser = Parser::from(module).unwrap();
@@ -71,8 +73,10 @@ mod tests {
         let module: ItemMod = parse_quote! {
             #[cxx_qt::bridge(cxx_file_stem = "my_object")]
             mod ffi {
-                #[cxx_qt::qobject]
-                pub struct MyObject;
+                extern "RustQt" {
+                    #[cxx_qt::qobject]
+                    type MyObject = super::MyObjectRust;
+                }
             }
         };
         let parser = Parser::from(module).unwrap();
@@ -88,8 +92,10 @@ mod tests {
         let module: ItemMod = parse_quote! {
             #[cxx_qt::bridge(namespace = "cxx_qt")]
             mod ffi {
-                #[cxx_qt::qobject]
-                pub struct MyObject;
+                extern "RustQt" {
+                    #[cxx_qt::qobject]
+                    type MyObject = super::MyObjectRust;
+                }
             }
         };
         let parser = Parser::from(module).unwrap();

diff --git a/crates/cxx-qt-gen/src/generator/cpp/qobject.rs b/crates/cxx-qt-gen/src/generator/cpp/qobject.rs
@@ -165,8 +165,10 @@ mod tests {
         let module: ItemMod = parse_quote! {
             #[cxx_qt::bridge]
             mod ffi {
-                #[cxx_qt::qobject]
-                pub struct MyObject;
+                extern "RustQt" {
+                    #[cxx_qt::qobject]
+                    type MyObject = super::MyObjectRust;
+                }
             }
         };
         let parser = Parser::from(module).unwrap();
@@ -188,8 +190,10 @@ mod tests {
         let module: ItemMod = parse_quote! {
             #[cxx_qt::bridge(namespace = "cxx_qt")]
             mod ffi {
-                #[cxx_qt::qobject(base = "QStringListModel")]
-                pub struct MyObject;
+                extern "RustQt" {
+                    #[cxx_qt::qobject(base = "QStringListModel")]
+                    type MyObject = super::MyObjectRust;
+                }
             }
         };
         let parser = Parser::from(module).unwrap();
@@ -209,8 +213,10 @@ mod tests {
         let module: ItemMod = parse_quote! {
             #[cxx_qt::bridge(namespace = "cxx_qt")]
             mod ffi {
-                #[cxx_qt::qobject(qml_uri = "com.kdab", qml_version = "1.0", qml_name = "MyQmlElement")]
-                pub struct MyNamedObject;
+                extern "RustQt" {
+                    #[cxx_qt::qobject(qml_uri = "com.kdab", qml_version = "1.0", qml_name = "MyQmlElement")]
+                    type MyNamedObject = super::MyNamedObjectRust;
+                }
             }
         };
         let parser = Parser::from(module).unwrap();
@@ -233,8 +239,10 @@ mod tests {
         let module: ItemMod = parse_quote! {
             #[cxx_qt::bridge(namespace = "cxx_qt")]
             mod ffi {
-                #[cxx_qt::qobject(qml_uri = "com.kdab", qml_version = "1.0", qml_singleton)]
-                pub struct MyObject;
+                extern "RustQt" {
+                    #[cxx_qt::qobject(qml_uri = "com.kdab", qml_version = "1.0", qml_singleton)]
+                    type MyObject = super::MyObjectRust;
+                }
             }
         };
         let parser = Parser::from(module).unwrap();
@@ -258,8 +266,10 @@ mod tests {
         let module: ItemMod = parse_quote! {
             #[cxx_qt::bridge(namespace = "cxx_qt")]
             mod ffi {
-                #[cxx_qt::qobject(qml_uri = "com.kdab", qml_version = "1.0", qml_uncreatable)]
-                pub struct MyObject;
+                extern "RustQt" {
+                    #[cxx_qt::qobject(qml_uri = "com.kdab", qml_version = "1.0", qml_uncreatable)]
+                    type MyObject = super::MyObjectRust;
+                }
             }
         };
         let parser = Parser::from(module).unwrap();

diff --git a/crates/cxx-qt-gen/src/generator/naming/namespace.rs b/crates/cxx-qt-gen/src/generator/naming/namespace.rs
@@ -15,7 +15,7 @@ pub struct NamespaceName {
 
 impl From<&ParsedQObject> for NamespaceName {
     fn from(qobject: &ParsedQObject) -> Self {
-        NamespaceName::from_pair_str(&qobject.namespace, &qobject.qobject_struct.ident)
+        NamespaceName::from_pair_str(&qobject.namespace, &qobject.qobject_ty.ident_left)
     }
 }
 

diff --git a/crates/cxx-qt-gen/src/generator/naming/qobject.rs b/crates/cxx-qt-gen/src/generator/naming/qobject.rs
@@ -24,18 +24,14 @@ pub struct QObjectName {
 
 impl From<&ParsedQObject> for QObjectName {
     fn from(qobject: &ParsedQObject) -> Self {
-        Self::from(&qobject.qobject_struct.ident)
-    }
-}
-
-impl From<&Ident> for QObjectName {
-    fn from(ident: &Ident) -> Self {
+        let ident_left = &qobject.qobject_ty.ident_left;
         Self {
-            ident: ident.clone(),
-            cpp_class: CombinedIdent::cpp_class_from_rust_struct(ident.clone()),
-            rust_struct: CombinedIdent::from_rust_struct(ident.clone()),
-            cxx_qt_thread_class: cxx_qt_thread_class_from_ident(ident),
-            cxx_qt_thread_queued_fn_struct: cxx_qt_thread_queued_fn_struct_from_ident(ident),
+            ident: ident_left.clone(),
+            // TODO: later we may support cxx_name or rust_name so keep these are CombinedIdents for now
+            cpp_class: CombinedIdent::from_ident(ident_left.clone()),
+            rust_struct: CombinedIdent::from_ident(qobject.qobject_ty.ident_right.clone()),
+            cxx_qt_thread_class: cxx_qt_thread_class_from_ident(ident_left),
+            cxx_qt_thread_queued_fn_struct: cxx_qt_thread_queued_fn_struct_from_ident(ident_left),
         }
     }
 }
@@ -61,16 +57,10 @@ fn cxx_qt_thread_queued_fn_struct_from_ident(ident: &Ident) -> Ident {
 }
 
 impl CombinedIdent {
-    /// For a given ident generate the C++ class name
-    fn cpp_class_from_rust_struct(ident: Ident) -> Self {
-        let rust = format_ident!("{ident}Qt");
-        Self { cpp: ident, rust }
-    }
-
     /// For a given ident generate the Rust and C++ names
-    fn from_rust_struct(ident: Ident) -> Self {
+    fn from_ident(ident: Ident) -> Self {
         Self {
-            cpp: format_ident!("{ident}Rust"),
+            cpp: ident.clone(),
             rust: ident,
         }
     }
@@ -90,9 +80,9 @@ pub mod tests {
     fn test_parsed_property() {
         let names = QObjectName::from(&create_parsed_qobject());
         assert_eq!(names.cpp_class.cpp, format_ident!("MyObject"));
-        assert_eq!(names.cpp_class.rust, format_ident!("MyObjectQt"));
+        assert_eq!(names.cpp_class.rust, format_ident!("MyObject"));
         assert_eq!(names.rust_struct.cpp, format_ident!("MyObjectRust"));
-        assert_eq!(names.rust_struct.rust, format_ident!("MyObject"));
+        assert_eq!(names.rust_struct.rust, format_ident!("MyObjectRust"));
         assert_eq!(
             names.cxx_qt_thread_class,
             format_ident!("MyObjectCxxQtThread")

diff --git a/crates/cxx-qt-gen/src/generator/rust/inherit.rs b/crates/cxx-qt-gen/src/generator/rust/inherit.rs
@@ -94,7 +94,7 @@ mod tests {
             quote! {
                 unsafe extern "C++" {
                     #[cxx_name = "testCxxQtInherit"]
-                    fn test(self: Pin<&mut MyObjectQt>, a: B, b: C);
+                    fn test(self: Pin<&mut MyObject>, a: B, b: C);
                 }
             },
         );
@@ -118,7 +118,7 @@ mod tests {
             quote! {
                 unsafe extern "C++" {
                     #[cxx_name = "testCxxQtInherit"]
-                    fn test(self: &MyObjectQt, a: B, b: C);
+                    fn test(self: &MyObject, a: B, b: C);
                 }
             },
         );
@@ -143,7 +143,7 @@ mod tests {
             quote! {
                 extern "C++" {
                     #[cxx_name = "testCxxQtInherit"]
-                    unsafe fn test(self: &MyObjectQt,);
+                    unsafe fn test(self: &MyObject,);
                 }
             },
         );

diff --git a/crates/cxx-qt-gen/src/generator/rust/invokable.rs b/crates/cxx-qt-gen/src/generator/rust/invokable.rs
@@ -172,16 +172,16 @@ mod tests {
             quote! {
                 extern "Rust" {
                     #[cxx_name = "voidInvokableWrapper"]
-                    fn void_invokable_wrapper(self: &MyObject, cpp: &MyObjectQt);
+                    fn void_invokable_wrapper(self: &MyObjectRust, cpp: &MyObject);
                 }
             },
         );
         assert_tokens_eq(
             &generated.cxx_qt_mod_contents[0],
             quote! {
-                impl MyObject {
+                impl MyObjectRust {
                     #[doc(hidden)]
-                    pub fn void_invokable_wrapper(self: &MyObject, cpp: &MyObjectQt) {
+                    pub fn void_invokable_wrapper(self: &MyObjectRust, cpp: &MyObject) {
                         cpp.void_invokable();
                     }
                 }
@@ -194,16 +194,16 @@ mod tests {
             quote! {
                 extern "Rust" {
                     #[cxx_name = "trivialInvokableWrapper"]
-                    fn trivial_invokable_wrapper(self: &MyObject, cpp: &MyObjectQt, param: i32) -> i32;
+                    fn trivial_invokable_wrapper(self: &MyObjectRust, cpp: &MyObject, param: i32) -> i32;
                 }
             },
         );
         assert_tokens_eq(
             &generated.cxx_qt_mod_contents[1],
             quote! {
-                impl MyObject {
+                impl MyObjectRust {
                     #[doc(hidden)]
-                    pub fn trivial_invokable_wrapper(self: &MyObject, cpp: &MyObjectQt, param: i32) -> i32 {
+                    pub fn trivial_invokable_wrapper(self: &MyObjectRust, cpp: &MyObject, param: i32) -> i32 {
                         return cpp.trivial_invokable(param);
                     }
                 }
@@ -216,16 +216,16 @@ mod tests {
             quote! {
                 extern "Rust" {
                     #[cxx_name = "opaqueInvokableWrapper"]
-                    fn opaque_invokable_wrapper(self: &mut MyObject, cpp: Pin<&mut MyObjectQt>, param: &QColor) -> UniquePtr<QColor>;
+                    fn opaque_invokable_wrapper(self: &mut MyObjectRust, cpp: Pin<&mut MyObject>, param: &QColor) -> UniquePtr<QColor>;
                 }
             },
         );
         assert_tokens_eq(
             &generated.cxx_qt_mod_contents[2],
             quote! {
-                impl MyObject {
+                impl MyObjectRust {
                     #[doc(hidden)]
-                    pub fn opaque_invokable_wrapper(self: &mut MyObject, cpp: Pin<&mut MyObjectQt>, param: &QColor) -> UniquePtr<QColor> {
+                    pub fn opaque_invokable_wrapper(self: &mut MyObjectRust, cpp: Pin<&mut MyObject>, param: &QColor) -> UniquePtr<QColor> {
                         return cpp.opaque_invokable(param);
                     }
                 }
@@ -238,16 +238,16 @@ mod tests {
             quote! {
                 extern "Rust" {
                     #[cxx_name = "unsafeInvokableWrapper"]
-                    unsafe fn unsafe_invokable_wrapper(self: &MyObject, cpp: &MyObjectQt, param: *mut T) -> *mut T;
+                    unsafe fn unsafe_invokable_wrapper(self: &MyObjectRust, cpp: &MyObject, param: *mut T) -> *mut T;
                 }
             },
         );
         assert_tokens_eq(
             &generated.cxx_qt_mod_contents[3],
             quote! {
-                impl MyObject {
+                impl MyObjectRust {
                     #[doc(hidden)]
-                    pub unsafe fn unsafe_invokable_wrapper(self: &MyObject, cpp: &MyObjectQt, param: *mut T) -> *mut T {
+                    pub unsafe fn unsafe_invokable_wrapper(self: &MyObjectRust, cpp: &MyObject, param: *mut T) -> *mut T {
                         return cpp.unsafe_invokable(param);
                     }
                 }

diff --git a/crates/cxx-qt-gen/src/generator/rust/mod.rs b/crates/cxx-qt-gen/src/generator/rust/mod.rs
@@ -73,8 +73,10 @@ mod tests {
         let module: ItemMod = parse_quote! {
             #[cxx_qt::bridge]
             mod ffi {
-                #[cxx_qt::qobject]
-                pub struct MyObject;
+                extern "RustQt" {
+                    #[cxx_qt::qobject]
+                    type MyObject = super::MyObjectRust;
+                }
             }
         };
         let parser = Parser::from(module).unwrap();
@@ -100,8 +102,10 @@ mod tests {
         let module: ItemMod = parse_quote! {
             #[cxx_qt::bridge(namespace = "cxx_qt")]
             mod ffi {
-                #[cxx_qt::qobject]
-                pub struct MyObject;
+                extern "RustQt" {
+                    #[cxx_qt::qobject]
+                    type MyObject = super::MyObjectRust;
+                }
             }
         };
         let parser = Parser::from(module).unwrap();
@@ -121,8 +125,10 @@ mod tests {
             mod ffi {
                 use std::collections::HashMap;
 
-                #[cxx_qt::qobject]
-                pub struct MyObject;
+                extern "RustQt" {
+                    #[cxx_qt::qobject]
+                    type MyObject = super::MyObjectRust;
+                }
             }
         };
         let parser = Parser::from(module).unwrap();
@@ -140,8 +146,10 @@ mod tests {
         let module: ItemMod = parse_quote! {
             #[cxx_qt::bridge(cxx_file_stem = "my_object")]
             mod ffi {
-                #[cxx_qt::qobject]
-                pub struct MyObject;
+                extern "RustQt" {
+                    #[cxx_qt::qobject]
+                    type MyObject = super::MyObjectRust;
+                }
             }
         };
         let parser = Parser::from(module).unwrap();