core: add attribute field to class definition

nac3core/src/toplevel/builtins.rs

@@ -83,6 +83,7 @@ pub fn get_exn_constructor(
         object_id: DefinitionId(class_id),
         type_vars: Vec::default(),
         fields: exception_fields,
+        attributes: Vec::default(),
         methods: vec![("__init__".into(), signature, DefinitionId(cons_id))],
         ancestors: vec![
             TypeAnnotation::CustomClass { id: DefinitionId(class_id), params: Vec::default() },
@@ -596,6 +597,7 @@ impl<'a> BuiltinBuilder<'a> {
                 object_id: prim.id(),
                 type_vars: Vec::default(),
                 fields: make_exception_fields(int32, int64, str),
+                attributes: Vec::default(),
                 methods: Vec::default(),
                 ancestors: vec![],
                 constructor: None,
@@ -624,7 +626,8 @@ impl<'a> BuiltinBuilder<'a> {
                 name: prim.name().into(),
                 object_id: prim.id(),
                 type_vars: vec![self.option_tvar.ty],
-                fields: vec![],
+                fields: Vec::default(),
+                attributes: Vec::default(),
                 methods: vec![
                     Self::create_method(PrimDef::OptionIsSome, self.is_some_ty.0),
                     Self::create_method(PrimDef::OptionIsNone, self.is_some_ty.0),
@@ -738,6 +741,7 @@ impl<'a> BuiltinBuilder<'a> {
                 object_id: prim.id(),
                 type_vars: vec![self.ndarray_dtype_tvar.ty, self.ndarray_ndims_tvar.ty],
                 fields: Vec::default(),
+                attributes: Vec::default(),
                 methods: vec![
                     Self::create_method(PrimDef::NDArrayCopy, self.ndarray_copy_ty.0),
                     Self::create_method(PrimDef::NDArrayFill, self.ndarray_fill_ty.0),

nac3core/src/toplevel/helper.rs

@@ -474,6 +474,7 @@ impl TopLevelComposer {
             object_id: obj_id,
             type_vars: Vec::default(),
             fields: Vec::default(),
+            attributes: Vec::default(),
             methods: Vec::default(),
             ancestors: Vec::default(),
             constructor,

nac3core/src/toplevel/mod.rs

@@ -103,6 +103,10 @@ pub enum TopLevelDef {
         ///
         /// Name and type is mutable.
         fields: Vec<(StrRef, Type, bool)>,
+        /// Class Attributes.
+        ///
+        /// Name, type, value.
+        attributes: Vec<(StrRef, Type, ast::Constant)>,
         /// Class methods, pointing to the corresponding function definition.
         methods: Vec<(StrRef, Type, DefinitionId)>,
         /// Ancestor classes, including itself.

nac3core/src/typecheck/type_inferencer/test.rs

@@ -289,6 +289,7 @@ impl TestEnvironment {
                     object_id: DefinitionId(i),
                     type_vars: Vec::default(),
                     fields: Vec::default(),
+                    attributes: Vec::default(),
                     methods: Vec::default(),
                     ancestors: Vec::default(),
                     resolver: None,
@@ -331,6 +332,7 @@ impl TestEnvironment {
                 object_id: DefinitionId(defs + 1),
                 type_vars: vec![tvar.ty],
                 fields: [("a".into(), tvar.ty, true)].into(),
+                attributes: Vec::default(),
                 methods: Vec::default(),
                 ancestors: Vec::default(),
                 resolver: None,
@@ -365,6 +367,7 @@ impl TestEnvironment {
                 object_id: DefinitionId(defs + 2),
                 type_vars: Vec::default(),
                 fields: [("a".into(), int32, true), ("b".into(), fun, true)].into(),
+                attributes: Vec::default(),
                 methods: Vec::default(),
                 ancestors: Vec::default(),
                 resolver: None,
@@ -393,6 +396,7 @@ impl TestEnvironment {
                 object_id: DefinitionId(defs + 3),
                 type_vars: Vec::default(),
                 fields: [("a".into(), bool, true), ("b".into(), fun, false)].into(),
+                attributes: Vec::default(),
                 methods: Vec::default(),
                 ancestors: Vec::default(),
                 resolver: None,