it takes shape...

src/twopass.rs

@@ -31,7 +31,7 @@ enum Statement {
 #[derive(Debug, Clone)]
 enum Location {
 	Variable {
-		name: Ident,
+		id: Ident,
 	},
 	Field {
 		table: Box<Location>,
@@ -123,7 +123,15 @@ impl BuildContext<'_> {
 	}
 }
 
-fn build_in_scope(parent: &BuildContext<'_>, code: ast::Function) -> Function {
+fn lookup(scope: &BuildContext<'_>, loc: &ast::Location) -> Location {
+	todo!()
+}
+
+fn build_expression(scope: &BuildContext<'_>, code: &ast::Expression) -> Expression {
+	todo!()
+}
+
+fn build_in_scope(parent: &BuildContext<'_>, code: &ast::Function) -> Function {
 	let scope = BuildContext {
 		parent: Some(parent),
 		scope: Default::default(),
@@ -131,13 +139,43 @@ fn build_in_scope(parent: &BuildContext<'_>, code: ast::Function) -> Function {
 	for (index, name) in code.args.iter().enumerate() {
 		scope.scope.borrow_mut().add_arg(name, index);
 	}
-	todo!()
+	let mut body = vec![];
+	for statement in &code.body {
+		match statement {
+			ast::Statement::Assign { target, source } => {
+				let target = lookup(&scope, target);
+				body.push(Statement::Assign {
+					target,
+					source: Box::new(build_expression(&scope, source)),
+				});
+			}
+			ast::Statement::Call { callee, args } => todo!(),
+			ast::Statement::Local { name, init } => {
+				let init = init.as_ref().map(|init| build_expression(&scope, &init));
+				let id = scope.scope.borrow_mut().add_local(&name);
+				if let Some(init) = init {
+					body.push(Statement::Assign {
+						target: Location::Variable { id },
+						source: Box::new(init),
+					});
+				}
+			}
+		}
+	}
+	Function {
+		name: code.name.clone(),
+		args: code.args.clone(),
+		locals: vec![],
+		upvalues: vec![],
+		body,
+		ret: Box::new(Expression::Constant(ast::Constant::Nil)),
+	}
 }
 
-pub fn build(code: ast::Function) -> Function {
+pub fn build(code: &ast::Function) -> Function {
 	let mut root = BuildContext {
 		parent: None,
 		scope: RefCell::new(Scope::new_toplevel()),
 	};
-	build_in_scope(&mut root, code)
+	build_in_scope(&mut root, &code)
 }