public object VisitSuperExpr(Expr.Super expr)
{
if (_currentClass == ClassType.NONE)
{
_logger.Error(expr.Keyword, "Cannot use 'super' outside of a class.");
}
else if (_currentClass != ClassType.SUBCLASS)
{
_logger.Error(expr.Keyword, "Cannot use 'super' in a class with no superclass.");
}
ResolveLocal(expr, expr.Keyword);
return(null);
}
public object VisitSuperExpr(Expr.Super expr)
{
var distance = _locals[expr];
var superclass = (LoxClass)_environment.GetAt(distance, "super");
// "this" is always one level nearer than "super"'s environment.
var @object = (LoxInstance)_environment.GetAt(distance - 1, "this");
var method = superclass.FindMethod(@object, expr.Method.Lexeme);
if (method == null)
{
throw new RuntimeError(expr.Method, $"Undefined property '{expr.Method.Lexeme}'.");
}
return(method);
}
public string VisitSuperExpr(Expr.Super expr)
{
return(Parenthesize2("super", expr.Method));
}
