[core] Refactor registration of top-level variables

nac3core/src/toplevel/composer.rs

@@ -1,6 +1,6 @@
 use std::rc::Rc;
 
-use nac3parser::ast::{fold::Fold, ExprKind};
+use nac3parser::ast::{fold::Fold, ExprKind, Ident};
 
 use super::*;
 use crate::{
@@ -386,28 +386,49 @@ impl TopLevelComposer {
                 let ExprKind::Name { id: name, .. } = target.node else {
                     return Err(format!(
                         "global variable declaration must be an identifier (at {})",
-                        ast.location
+                        target.location
                     ));
                 };
 
-                if self.keyword_list.contains(&name) {
-                    return Err(format!(
-                        "cannot use keyword `{}` as a class name (at {})",
+                self.register_top_level_var(
                     name,
-                        ast.location
-                    ));
+                    Some(annotation.as_ref().clone()),
+                    resolver,
+                    mod_path,
+                    target.location,
+                )
             }
 
-                let global_var_name = if mod_path.is_empty() {
-                    name.to_string()
-                } else {
-                    format!("{mod_path}.{name}")
-                };
-                if !defined_names.insert(global_var_name.clone()) {
-                    return Err(format!(
-                        "global variable `{}` defined twice (at {})",
-                        global_var_name,
+            _ => Err(format!(
+                "registrations of constructs other than top level classes/functions/variables are not supported (at {})",
                 ast.location
+            )),
+        }
+    }
+
+    /// Registers a top-level variable with the given `name` into the composer.
+    ///
+    /// `annotation` - The type annotation of the top-level variable, or [`None`] if no type
+    /// annotation is provided.
+    /// `location` - The location of the top-level variable.
+    pub fn register_top_level_var(
+        &mut self,
+        name: Ident,
+        annotation: Option<Expr>,
+        resolver: Option<Arc<dyn SymbolResolver + Send + Sync>>,
+        mod_path: &str,
+        location: Location,
+    ) -> Result<(StrRef, DefinitionId, Option<Type>), String> {
+        if self.keyword_list.contains(&name) {
+            return Err(format!("cannot use keyword `{name}` as a class name (at {location})"));
+        }
+
+        let global_var_name =
+            if mod_path.is_empty() { name.to_string() } else { format!("{mod_path}.{name}") };
+
+        if !self.defined_names.insert(global_var_name.clone()) {
+            return Err(format!(
+                "global variable `{global_var_name}` defined twice (at {location})"
             ));
         }
 
@@ -418,25 +439,15 @@ impl TopLevelComposer {
                 name,
                 // dummy here, unify with correct type later,
                 ty_to_be_unified,
-                        *(annotation.clone()),
+                annotation,
                 resolver,
-                        Some(ast.location),
-                    )).into(),
+                Some(location),
+            ))
+            .into(),
             None,
         ));
 
-                Ok((
-                    name,
-                    DefinitionId(self.definition_ast_list.len() - 1),
-                    Some(ty_to_be_unified),
-                ))
-            }
-
-            _ => Err(format!(
-                "registrations of constructs other than top level classes/functions/variables are not supported (at {})",
-                ast.location
-            )),
-        }
+        Ok((name, DefinitionId(self.definition_ast_list.len() - 1), Some(ty_to_be_unified)))
     }
 
     pub fn start_analysis(&mut self, inference: bool) -> Result<(), HashSet<String>> {
@@ -2249,9 +2260,8 @@ impl TopLevelComposer {
         let primitives_store = &self.primitives_ty;
 
         let mut analyze = |variable_def: &Arc<RwLock<TopLevelDef>>| -> Result<_, HashSet<String>> {
-            let variable_def = &mut *variable_def.write();
-
-            let TopLevelDef::Variable { ty: dummy_ty, ty_decl, resolver, loc, .. } = variable_def
+            let TopLevelDef::Variable { ty: dummy_ty, ty_decl, resolver, loc, .. } =
+                &*variable_def.read()
             else {
                 // not top level variable def, skip
                 return Ok(());
@@ -2259,6 +2269,7 @@ impl TopLevelComposer {
 
             let resolver = &**resolver.as_ref().unwrap();
 
+            if let Some(ty_decl) = ty_decl {
                 let ty_annotation = parse_ast_to_type_annotation_kinds(
                     resolver,
                     &temp_def_list,
@@ -2278,6 +2289,8 @@ impl TopLevelComposer {
                 unifier.unify(*dummy_ty, ty_from_ty_annotation).map_err(|e| {
                     HashSet::from([e.at(Some(loc.unwrap())).to_display(unifier).to_string()])
                 })?;
+            }
+
             Ok(())
         };
 

nac3core/src/toplevel/helper.rs

@@ -600,7 +600,7 @@ impl TopLevelComposer {
         name: String,
         simple_name: StrRef,
         ty: Type,
-        ty_decl: Expr,
+        ty_decl: Option<Expr>,
         resolver: Option<Arc<dyn SymbolResolver + Send + Sync>>,
         loc: Option<Location>,
     ) -> TopLevelDef {

nac3core/src/toplevel/mod.rs

@@ -158,8 +158,8 @@ pub enum TopLevelDef {
         /// Type of the global variable.
         ty: Type,
 
-        /// The declared type of the global variable.
-        ty_decl: Expr,
+        /// The declared type of the global variable, or [`None`] if no type annotation is provided.
+        ty_decl: Option<Expr>,
 
         /// Symbol resolver of the module defined the class.
         resolver: Option<Arc<dyn SymbolResolver + Send + Sync>>,

nac3standalone/src/main.rs

@@ -248,8 +248,9 @@ fn handle_assignment_pattern(
 fn handle_global_var(
     target: &Expr,
     value: Option<&Expr>,
-    resolver: &(dyn SymbolResolver + Send + Sync),
+    resolver: &Arc<dyn SymbolResolver + Send + Sync>,
     internal_resolver: &ResolverInternal,
+    composer: &mut TopLevelComposer,
 ) -> Result<(), String> {
     let ExprKind::Name { id, .. } = target.node else {
         return Err(format!(
@@ -262,8 +263,12 @@ fn handle_global_var(
         return Err(format!("global variable `{id}` must be initialized in its definition"));
     };
 
-    if let Ok(val) = parse_parameter_default_value(value, resolver) {
+    if let Ok(val) = parse_parameter_default_value(value, &**resolver) {
         internal_resolver.add_module_global(id, val);
+        let (name, def_id, _) = composer
+            .register_top_level_var(id, None, Some(resolver.clone()), "__main__", target.location)
+            .unwrap();
+        internal_resolver.add_id_def(name, def_id);
         Ok(())
     } else {
         Err(format!(
@@ -375,16 +380,12 @@ fn main() {
                 if let Err(err) = handle_global_var(
                     target,
                     value.as_ref().map(Box::as_ref),
-                    resolver.as_ref(),
+                    &resolver,
                     internal_resolver.as_ref(),
+                    &mut composer,
                 ) {
                     panic!("{err}");
                 }
-
-                let (name, def_id, _) = composer
-                    .register_top_level(stmt, Some(resolver.clone()), "__main__", true)
-                    .unwrap();
-                internal_resolver.add_id_def(name, def_id);
             }
 
             // allow (and ignore) "from __future__ import annotations"