public object visit_Super_Expr(GExpr.Super expr)
{
if (currentClass == ClassType.NONE)
{
Program.error(expr.keyword, "Cannot use 'super' outside of a class");
}
else if (currentClass != ClassType.SUBCLASS)
{
Program.error(expr.keyword, "Cannot use 'super' in a class with no superclass");
}
resolveLocal(expr, expr.keyword);
return(null);
}
public object visit_Super_Expr(GExpr.Super expr)
{
int distance = locals[expr];
LoxClass superClass = (LoxClass)environment.getAt(distance, "super");
// "this" is always 1 level nearer than "super's" environment
LoxInstance obj = (LoxInstance)environment.getAt(distance - 1, "this");
LoxFunction method = superClass.findMethod(obj, expr.method.lexeme);
if (method == null)
{
throw new RuntimeError(expr.method, $"Undefined property '{expr.method.lexeme}'");
}
return(method);
}