Getter/Setter for fields

crates/backend/src/ast.rs

@@ -34,19 +34,18 @@ pub struct Program {
 #[cfg_attr(feature = "extra-traits", derive(Debug))]
 #[derive(Clone)]
 pub struct Export {
-    /// The struct name, in Rust, this is attached to
-    pub rust_class: Option<Ident>,
+    /// Comments extracted from the rust source.
+    pub comments: Vec<String>,
+    /// The rust function
+    pub function: Function,
     /// The class name in JS this is attached to
     pub js_class: Option<String>,
+    /// The kind (static, named, regular)
+    pub method_kind: MethodKind,
     /// The type of `self` (either `self`, `&self`, or `&mut self`)
     pub method_self: Option<MethodSelf>,
-    /// Whether or not this export is flagged as a constructor, returning an
-    /// instance of the `impl` type
-    pub is_constructor: bool,
-    /// The rust function
-    pub function: Function,
-    /// Comments extracted from the rust source.
-    pub comments: Vec<String>,
+    /// The struct name, in Rust, this is attached to
+    pub rust_class: Option<Ident>,
     /// The name of the rust function/method on the rust side.
     pub rust_name: Ident,
     /// Whether or not this function should be flagged as the wasm start
@@ -342,28 +341,28 @@ impl ImportKind {
     }
 }
 
-impl ImportFunction {
+impl Function {
     /// If the rust object has a `fn xxx(&self) -> MyType` method, get the name for a getter in
     /// javascript (in this case `xxx`, so you can write `val = obj.xxx`)
     pub fn infer_getter_property(&self) -> &str {
-        &self.function.name
+        &self.name
     }
 
     /// If the rust object has a `fn set_xxx(&mut self, MyType)` style method, get the name
     /// for a setter in javascript (in this case `xxx`, so you can write `obj.xxx = val`)
     pub fn infer_setter_property(&self) -> Result<String, Diagnostic> {
-        let name = self.function.name.to_string();
+        let name = self.name.to_string();
 
         // if `#[wasm_bindgen(js_name = "...")]` is used then that explicitly
         // because it was hand-written anyway.
-        if self.function.renamed_via_js_name {
+        if self.renamed_via_js_name {
             return Ok(name);
         }
 
         // Otherwise we infer names based on the Rust function name.
         if !name.starts_with("set_") {
             bail_span!(
-                syn::token::Pub(self.function.name_span),
+                syn::token::Pub(self.name_span),
                 "setters must start with `set_`, found: {}",
                 name,
             );

crates/backend/src/encode.rs

@@ -125,7 +125,7 @@ fn shared_program<'a>(
             .exports
             .iter()
             .map(|a| shared_export(a, intern))
-            .collect(),
+            .collect::<Result<Vec<_>, _>>()?,
         structs: prog
             .structs
             .iter()
@@ -172,21 +172,23 @@ fn shared_program<'a>(
     })
 }
 
-fn shared_export<'a>(export: &'a ast::Export, intern: &'a Interner) -> Export<'a> {
-    let (method, consumed) = match export.method_self {
-        Some(ast::MethodSelf::ByValue) => (true, true),
-        Some(_) => (true, false),
-        None => (false, false),
+fn shared_export<'a>(
+    export: &'a ast::Export,
+    intern: &'a Interner,
+) -> Result<Export<'a>, Diagnostic> {
+    let consumed = match export.method_self {
+        Some(ast::MethodSelf::ByValue) => true,
+        _ => false,
     };
-    Export {
+    let method_kind = from_ast_method_kind(&export.function, intern, &export.method_kind)?;
+    Ok(Export {
         class: export.js_class.as_ref().map(|s| &**s),
-        method,
+        comments: export.comments.iter().map(|s| &**s).collect(),
         consumed,
-        is_constructor: export.is_constructor,
         function: shared_function(&export.function, intern),
-        comments: export.comments.iter().map(|s| &**s).collect(),
+        method_kind,
         start: export.start,
-    }
+    })
 }
 
 fn shared_function<'a>(func: &'a ast::Function, _intern: &'a Interner) -> Function<'a> {
@@ -260,30 +262,7 @@ fn shared_import_function<'a>(
 ) -> Result<ImportFunction<'a>, Diagnostic> {
     let method = match &i.kind {
         ast::ImportFunctionKind::Method { class, kind, .. } => {
-            let kind = match kind {
-                ast::MethodKind::Constructor => MethodKind::Constructor,
-                ast::MethodKind::Operation(ast::Operation { is_static, kind }) => {
-                    let is_static = *is_static;
-                    let kind = match kind {
-                        ast::OperationKind::Regular => OperationKind::Regular,
-                        ast::OperationKind::Getter(g) => {
-                            let g = g.as_ref().map(|g| intern.intern(g));
-                            OperationKind::Getter(g.unwrap_or_else(|| i.infer_getter_property()))
-                        }
-                        ast::OperationKind::Setter(s) => {
-                            let s = s.as_ref().map(|s| intern.intern(s));
-                            OperationKind::Setter(match s {
-                                Some(s) => s,
-                                None => intern.intern_str(&i.infer_setter_property()?),
-                            })
-                        }
-                        ast::OperationKind::IndexingGetter => OperationKind::IndexingGetter,
-                        ast::OperationKind::IndexingSetter => OperationKind::IndexingSetter,
-                        ast::OperationKind::IndexingDeleter => OperationKind::IndexingDeleter,
-                    };
-                    MethodKind::Operation(Operation { is_static, kind })
-                }
-            };
+            let kind = from_ast_method_kind(&i.function, intern, kind)?;
             Some(MethodData { class, kind })
         }
         ast::ImportFunctionKind::Normal => None,
@@ -507,3 +486,34 @@ macro_rules! encode_api {
     );
 }
 wasm_bindgen_shared::shared_api!(encode_api);
+
+fn from_ast_method_kind<'a>(
+    function: &'a ast::Function,
+    intern: &'a Interner,
+    method_kind: &'a ast::MethodKind,
+) -> Result<MethodKind<'a>, Diagnostic> {
+    Ok(match method_kind {
+        ast::MethodKind::Constructor => MethodKind::Constructor,
+        ast::MethodKind::Operation(ast::Operation { is_static, kind }) => {
+            let is_static = *is_static;
+            let kind = match kind {
+                ast::OperationKind::Getter(g) => {
+                    let g = g.as_ref().map(|g| intern.intern(g));
+                    OperationKind::Getter(g.unwrap_or_else(|| function.infer_getter_property()))
+                }
+                ast::OperationKind::Regular => OperationKind::Regular,
+                ast::OperationKind::Setter(s) => {
+                    let s = s.as_ref().map(|s| intern.intern(s));
+                    OperationKind::Setter(match s {
+                        Some(s) => s,
+                        None => intern.intern_str(&function.infer_setter_property()?),
+                    })
+                }
+                ast::OperationKind::IndexingGetter => OperationKind::IndexingGetter,
+                ast::OperationKind::IndexingSetter => OperationKind::IndexingSetter,
+                ast::OperationKind::IndexingDeleter => OperationKind::IndexingDeleter,
+            };
+            MethodKind::Operation(Operation { is_static, kind })
+        }
+    })
+}

crates/cli-support/src/js/js2rust.rs

@@ -103,26 +103,24 @@ impl<'a, 'b> Js2Rust<'a, 'b> {
 
     /// Flag this shim as a method call into Rust, so the first Rust argument
     /// passed should be `this.ptr`.
-    pub fn method(&mut self, method: bool, consumed: bool) -> &mut Self {
-        if method {
-            if self.cx.config.debug {
-                self.prelude(
-                    "if (this.ptr === 0) {
-                         throw new Error('Attempt to use a moved value');
-                    }",
-                );
-            }
-            if consumed {
-                self.prelude(
-                    "\
-                     const ptr = this.ptr;\n\
-                     this.ptr = 0;\n\
-                     ",
-                );
-                self.rust_arguments.insert(0, "ptr".to_string());
-            } else {
-                self.rust_arguments.insert(0, "this.ptr".to_string());
-            }
+    pub fn method(&mut self, consumed: bool) -> &mut Self {
+        if self.cx.config.debug {
+            self.prelude(
+                "if (this.ptr === 0) {
+                        throw new Error('Attempt to use a moved value');
+                }",
+            );
+        }
+        if consumed {
+            self.prelude(
+                "\
+                 const ptr = this.ptr;\n\
+                 this.ptr = 0;\n\
+                 ",
+            );
+            self.rust_arguments.insert(0, "ptr".to_string());
+        } else {
+            self.rust_arguments.insert(0, "this.ptr".to_string());
         }
         self
     }