visitClassStmt method

@override void visitClassStmt(Class stmt)

Implementation

@override
void visitClassStmt(Stmt.Class stmt) {
  Object? superclass;
  if (stmt.superclass != null) {
    superclass = evaluate(stmt.superclass!);
    if (superclass is! LoxClass) {
      throw RuntimeError(
          stmt.superclass!.name, "Superclass must be a class.");
    }
  }

  environment.define(stmt.name.lexeme, null);

  if (stmt.superclass != null) {
    environment = Environment(environment);
    environment.define("super", superclass);
  }

  Map<String, LoxFunction> methods = {};
  for (Stmt.Functional method in stmt.methods) {
    LoxFunction function = LoxFunction(
        method, environment, method.name.lexeme == stmt.name.lexeme); // init
    for (var key in function.declaration.namedParams.keys) {
      if (function.declaration.namedParams[key] != null) {
        function.declaration.namedParams[key] =
            evaluate(function.declaration.namedParams[key] as Expr.Expr);
      }
    }
    methods[method.name.lexeme] = function;
  }
  LoxClass klass = LoxClass(stmt.name.lexeme,
      superclass == null ? null : superclass as LoxClass, methods);

  if (superclass != null) {
    environment = environment.enclosing!;
  }
  environment.assign(stmt.name, klass);
  return;
}