Add applying of typedefs, remove generation of type aliases

crates/backend/src/ast.rs

@@ -17,8 +17,6 @@ pub struct Program {
     pub enums: Vec<Enum>,
     /// rust structs
     pub structs: Vec<Struct>,
-    /// rust type aliases
-    pub type_aliases: Vec<TypeAlias>,
     /// rust consts
     pub consts: Vec<Const>,
 }
@@ -198,13 +196,6 @@ pub enum TypeLocation {
     ExportRet,
 }
 
-#[cfg_attr(feature = "extra-traits", derive(Debug, PartialEq, Eq))]
-pub struct TypeAlias {
-    pub vis: syn::Visibility,
-    pub dest: Ident,
-    pub src: syn::Type,
-}
-
 #[cfg_attr(feature = "extra-traits", derive(Debug, PartialEq))]
 pub struct Const {
     pub vis: syn::Visibility,

crates/backend/src/codegen.rs

@@ -64,9 +64,6 @@ impl TryToTokens for ast::Program {
         for e in self.enums.iter() {
             e.to_tokens(tokens);
         }
-        for a in self.type_aliases.iter() {
-            a.to_tokens(tokens);
-        }
         for c in self.consts.iter() {
             c.to_tokens(tokens);
         }
@@ -983,18 +980,6 @@ impl ToTokens for ast::ImportStatic {
     }
 }
 
-impl ToTokens for ast::TypeAlias {
-    fn to_tokens(&self, into: &mut TokenStream) {
-        let vis = &self.vis;
-        let dest = &self.dest;
-        let src = &self.src;
-        (quote! {
-            #[allow(non_camel_case_types)]
-            #vis type #dest = #src;
-        }).to_tokens(into);
-    }
-}
-
 impl ToTokens for ast::Const {
     fn to_tokens(&self, tokens: &mut TokenStream) {
         use ast::ConstValue::*;

crates/backend/src/defined.rs

@@ -83,7 +83,6 @@ impl ImportedTypes for ast::Program {
         F: FnMut(&Ident, ImportedTypeKind),
     {
         self.imports.imported_types(f);
-        self.type_aliases.imported_types(f);
         self.consts.imported_types(f);
     }
 }
@@ -290,15 +289,6 @@ impl ImportedTypes for ast::ImportEnum {
     }
 }
 
-impl ImportedTypes for ast::TypeAlias {
-    fn imported_types<F>(&self, f: &mut F)
-    where
-        F: FnMut(&Ident, ImportedTypeKind),
-    {
-        f(&self.dest, ImportedTypeKind::Reference);
-    }
-}
-
 impl ImportedTypes for ast::Const {
     fn imported_types<F>(&self, f: &mut F)
     where
@@ -322,7 +312,6 @@ impl RemoveUndefinedImports for ast::Program {
         F: Fn(&Ident) -> bool,
     {
         self.imports.remove_undefined_imports(is_defined);
-        self.type_aliases.remove_undefined_imports(is_defined);
         self.consts.remove_undefined_imports(is_defined);
     }
 }

crates/webidl/src/first_pass.rs

@@ -23,6 +23,7 @@ pub(crate) struct FirstPassRecord<'a> {
     pub(crate) enums: BTreeSet<String>,
     /// The mixins, mapping their name to the webidl ast node for the mixin.
     pub(crate) mixins: BTreeMap<String, MixinData<'a>>,
+    pub(crate) typedefs: BTreeMap<String, webidl::ast::Type>,
 }
 
 /// We need to collect interface data during the first pass, to be used later.
@@ -82,6 +83,7 @@ impl FirstPass<()> for webidl::ast::Definition {
             Enum(enum_) => enum_.first_pass(record, ()),
             Interface(interface) => interface.first_pass(record, ()),
             Mixin(mixin) => mixin.first_pass(record, ()),
+            Typedef(typedef) => typedef.first_pass(record, ()),
             _ => {
                 // Other definitions aren't currently used in the first pass
                 Ok(())
@@ -356,3 +358,17 @@ impl FirstPass<()> for webidl::ast::PartialMixin {
         Ok(())
     }
 }
+
+impl FirstPass<()> for webidl::ast::Typedef {
+    fn first_pass<'a>(&'a self, record: &mut FirstPassRecord<'a>, (): ()) -> Result<()> {
+        if ::util::is_chrome_only(&self.extended_attributes) {
+            return Ok(());
+        }
+
+        if record.typedefs.insert(self.name.clone(), *self.type_.clone()).is_some() {
+            warn!("Encountered multiple declarations of {}", self.name);
+        }
+
+        Ok(())
+    }
+}

crates/webidl/src/lib.rs

@@ -40,7 +40,7 @@ use failure::{ResultExt, Fail};
 use heck::{ShoutySnakeCase};
 
 use first_pass::{FirstPass, FirstPassRecord};
-use util::{public, webidl_const_ty_to_syn_ty, webidl_const_v_to_backend_const_v, TypePosition, camel_case_ident, mdn_doc};
+use util::{ApplyTypedefs, public, webidl_const_ty_to_syn_ty, webidl_const_v_to_backend_const_v, camel_case_ident, mdn_doc};
 
 pub use error::{Error, ErrorKind, Result};
 
@@ -159,9 +159,6 @@ impl WebidlParse<()> for webidl::ast::Definition {
             webidl::ast::Definition::Interface(interface) => {
                 interface.webidl_parse(program, first_pass, ())?
             }
-            webidl::ast::Definition::Typedef(typedef) => {
-                typedef.webidl_parse(program, first_pass, ())?
-            }
             // TODO
             webidl::ast::Definition::Callback(..)
             | webidl::ast::Definition::Dictionary(..)
@@ -169,7 +166,8 @@ impl WebidlParse<()> for webidl::ast::Definition {
             | webidl::ast::Definition::Namespace(..) => {
                 warn!("Unsupported WebIDL definition: {:?}", self)
             }
-            webidl::ast::Definition::Mixin(_) => {
+            webidl::ast::Definition::Mixin(_)
+            | webidl::ast::Definition::Typedef(_) => {
                 // handled in the first pass
             }
         }
@@ -226,39 +224,6 @@ impl WebidlParse<()> for webidl::ast::Interface {
     }
 }
 
-impl WebidlParse<()> for webidl::ast::Typedef {
-    fn webidl_parse(
-        &self,
-        program: &mut backend::ast::Program,
-        first_pass: &FirstPassRecord<'_>,
-        (): (),
-    ) -> Result<()> {
-        if util::is_chrome_only(&self.extended_attributes) {
-            return Ok(());
-        }
-
-        let dest = rust_ident(camel_case_ident(&self.name).as_str());
-        let src = match first_pass.webidl_ty_to_syn_ty(&self.type_, TypePosition::Return) {
-            Some(src) => src,
-            None => {
-                warn!(
-                    "typedef's source type is not yet supported: {:?}. Skipping typedef {:?}",
-                    *self.type_, self
-                );
-                return Ok(());
-            }
-        };
-
-        program.type_aliases.push(backend::ast::TypeAlias {
-            vis: public(),
-            dest,
-            src,
-        });
-
-        Ok(())
-    }
-}
-
 impl WebidlParse<()> for webidl::ast::NonPartialInterface {
     fn webidl_parse(
         &self,
@@ -334,6 +299,11 @@ impl<'a> WebidlParse<&'a webidl::ast::NonPartialInterface> for webidl::ast::Exte
         interface: &'a webidl::ast::NonPartialInterface,
     ) -> Result<()> {
         let mut add_constructor = |arguments: &[webidl::ast::Argument], class: &str| {
+            let arguments = &arguments
+                .iter()
+                .map(|argument| argument.apply_typedefs(first_pass))
+                .collect::<Vec<_>>();
+
             let (overloaded, same_argument_names) = first_pass.get_operation_overloading(
                 arguments,
                 ::first_pass::OperationId::Constructor,
@@ -530,7 +500,7 @@ impl<'a> WebidlParse<&'a str> for webidl::ast::RegularAttribute {
         first_pass
             .create_getter(
                 &self.name,
-                &self.type_,
+                &self.type_.apply_typedefs(first_pass),
                 self_name,
                 false,
                 is_structural,
@@ -543,7 +513,7 @@ impl<'a> WebidlParse<&'a str> for webidl::ast::RegularAttribute {
             first_pass
                 .create_setter(
                     &self.name,
-                    &self.type_,
+                    &self.type_.apply_typedefs(first_pass),
                     self_name,
                     false,
                     is_structural,
@@ -618,7 +588,7 @@ impl<'a> WebidlParse<&'a str> for webidl::ast::StaticAttribute {
         first_pass
             .create_getter(
                 &self.name,
-                &self.type_,
+                &self.type_.apply_typedefs(first_pass),
                 self_name,
                 true,
                 is_structural,
@@ -631,7 +601,7 @@ impl<'a> WebidlParse<&'a str> for webidl::ast::StaticAttribute {
             first_pass
                 .create_setter(
                     &self.name,
-                    &self.type_,
+                    &self.type_.apply_typedefs(first_pass),
                     self_name,
                     true,
                     is_structural,
@@ -660,9 +630,13 @@ impl<'a> WebidlParse<&'a str> for webidl::ast::RegularOperation {
 
         first_pass
             .create_basic_method(
-                &self.arguments,
+                &self
+                    .arguments
+                    .iter()
+                    .map(|argument| argument.apply_typedefs(first_pass))
+                    .collect::<Vec<_>>(),
                 self.name.as_ref(),
-                &self.return_type,
+                &self.return_type.apply_typedefs(first_pass),
                 self_name,
                 false,
                 throws,
@@ -689,9 +663,13 @@ impl<'a> WebidlParse<&'a str> for webidl::ast::StaticOperation {
 
         first_pass
             .create_basic_method(
-                &self.arguments,
+                &self
+                    .arguments
+                    .iter()
+                    .map(|argument| argument.apply_typedefs(first_pass))
+                    .collect::<Vec<_>>(),
                 self.name.as_ref(),
-                &self.return_type,
+                &self.return_type.apply_typedefs(first_pass),
                 self_name,
                 true,
                 throws,
@@ -741,10 +719,10 @@ impl<'a> WebidlParse<&'a str> for webidl::ast::Const {
     fn webidl_parse(
         &self,
         program: &mut backend::ast::Program,
-        _: &FirstPassRecord<'_>,
+        first_pass: &FirstPassRecord<'_>,
         self_name: &'a str,
     ) -> Result<()> {
-        let ty = webidl_const_ty_to_syn_ty(&self.type_);
+        let ty = webidl_const_ty_to_syn_ty(&self.type_.apply_typedefs(first_pass));
 
         program.consts.push(backend::ast::Const {
             vis: public(),

crates/webidl/src/util.rs

@@ -142,6 +142,111 @@ pub enum TypePosition {
     Return,
 }
 
+fn type_kind_to_const_type(type_kind: &webidl::ast::TypeKind) -> webidl::ast::ConstType {
+    match type_kind {
+        webidl::ast::TypeKind::Boolean => webidl::ast::ConstType::Boolean,
+        webidl::ast::TypeKind::Byte => webidl::ast::ConstType::Byte,
+        webidl::ast::TypeKind::Identifier(identifier) => webidl::ast::ConstType::Identifier(identifier.clone()),
+        webidl::ast::TypeKind::Octet => webidl::ast::ConstType::Octet,
+        webidl::ast::TypeKind::RestrictedDouble => webidl::ast::ConstType::RestrictedDouble,
+        webidl::ast::TypeKind::RestrictedFloat => webidl::ast::ConstType::RestrictedFloat,
+        webidl::ast::TypeKind::SignedLong => webidl::ast::ConstType::SignedLong,
+        webidl::ast::TypeKind::SignedLongLong => webidl::ast::ConstType::SignedLongLong,
+        webidl::ast::TypeKind::SignedShort => webidl::ast::ConstType::SignedShort,
+        webidl::ast::TypeKind::UnrestrictedDouble => webidl::ast::ConstType::UnrestrictedDouble,
+        webidl::ast::TypeKind::UnrestrictedFloat => webidl::ast::ConstType::UnrestrictedFloat,
+        webidl::ast::TypeKind::UnsignedLong => webidl::ast::ConstType::UnsignedLong,
+        webidl::ast::TypeKind::UnsignedLongLong => webidl::ast::ConstType::UnsignedLongLong,
+        webidl::ast::TypeKind::UnsignedShort => webidl::ast::ConstType::UnsignedShort,
+        _ => panic!("can not convert TypeKind to ConstType: {:#?}", type_kind),
+    }
+}
+
+/// Implemented on an AST type node to apply typedefs.
+pub(crate) trait ApplyTypedefs {
+    fn apply_typedefs<'a>(&self, record: &FirstPassRecord<'a>) -> Self;
+}
+
+impl ApplyTypedefs for webidl::ast::Type {
+    fn apply_typedefs<'a>(&self, record: &FirstPassRecord<'a>) -> Self {
+        webidl::ast::Type {
+            extended_attributes: self.extended_attributes.clone(),
+            kind: self.kind.apply_typedefs(record),
+            nullable: self.nullable,
+        }
+    }
+}
+
+impl ApplyTypedefs for webidl::ast::ReturnType {
+    fn apply_typedefs<'a>(&self, record: &FirstPassRecord<'a>) -> Self {
+        match self {
+            webidl::ast::ReturnType::NonVoid(ty) =>
+                webidl::ast::ReturnType::NonVoid(Box::new(ty.apply_typedefs(record))),
+            _ => self.clone(),
+        }
+    }
+}
+
+impl ApplyTypedefs for webidl::ast::StringType {
+    fn apply_typedefs<'a>(&self, _: &FirstPassRecord<'a>) -> Self {
+        *self
+    }
+}
+
+impl ApplyTypedefs for webidl::ast::ConstType {
+    fn apply_typedefs<'a>(&self, record: &FirstPassRecord<'a>) -> Self {
+        match self {
+            webidl::ast::ConstType::Identifier(identifier) =>
+                record
+                    .typedefs
+                    .get(identifier)
+                    .map(|ty| type_kind_to_const_type(&ty.kind))
+                    .unwrap_or(self.clone()),
+            _ => self.clone(),
+        }
+    }
+}
+
+impl ApplyTypedefs for webidl::ast::TypeKind {
+    fn apply_typedefs<'a>(&self, record: &FirstPassRecord<'a>) -> Self {
+        match self {
+            webidl::ast::TypeKind::FrozenArray(ty) =>
+                webidl::ast::TypeKind::FrozenArray(Box::new(ty.apply_typedefs(record))),
+            webidl::ast::TypeKind::Identifier(identifier) => record
+                .typedefs
+                .get(identifier)
+                .map(|ty| ty.kind.clone())
+                .unwrap_or(self.clone()),
+            webidl::ast::TypeKind::Promise(ty) =>
+                webidl::ast::TypeKind::Promise(ty.apply_typedefs(record)),
+            webidl::ast::TypeKind::Record(string_type, ty) => webidl::ast::TypeKind::Record(
+                string_type.apply_typedefs(record),
+                Box::new(ty.apply_typedefs(record)),
+            ),
+            webidl::ast::TypeKind::Union(types) => webidl::ast::TypeKind::Union(
+                types
+                    .iter()
+                    .map(|ty| Box::new(ty.apply_typedefs(record)))
+                    .collect(),
+            ),
+            _ => self.clone(),
+        }
+    }
+}
+
+impl ApplyTypedefs for webidl::ast::Argument {
+    fn apply_typedefs<'a>(&self, record: &FirstPassRecord<'a>) -> Self {
+        webidl::ast::Argument {
+            extended_attributes: self.extended_attributes.clone(),
+            default: self.default.clone(),
+            name: self.name.clone(),
+            optional: self.optional,
+            type_: Box::new(self.type_.apply_typedefs(record)),
+            variadic: self.variadic,
+        }
+    }
+}
+
 /// Implemented on an AST type node to generate a snake case name.
 trait TypeToString {
     fn type_to_string(&self) -> String;