public Void Visit_SuperExpr(SuperExpr expr)
{
if (_currentClass == ClassType.None)
{
_errors.Add(new Error(expr.keyword, ErrorType.InvalidUseOfSuper, "Cannot use 'super' outside of a class."));
}
else if (_currentClass != ClassType.Subclass)
{
_errors.Add(new Error(expr.keyword, ErrorType.InvalidUseOfSuper, "Cannot use 'super' in a class wihtout superclass."));
}
ResolveLocal(expr, expr.keyword);
return(null);
}
public object VisitSuperExpr(SuperExpr expr)
{
if (_currentClassType == ClassType.NONE)
{
Lox.Error(expr.Keyword, "Cannot use 'super' outside of a class.");
}
else if (_currentClassType != ClassType.SUBCLASS)
{
Lox.Error(expr.Keyword, "Cannot use 'super' in a class with no super class.");
}
ResolveLocal(expr, expr.Keyword);
return(null);
}
public object VisitSuperExpr(SuperExpr expr)
{
int distance = _locals[expr];
var superClass = _scope.GetAt(distance, "super") as LoxClass;
// "this" is always one level closer than "super"'s scope.
var obj = _scope.GetAt(distance - 1, "this") as LoxInstance;
var method = superClass.FindMethod(obj, expr.Method.Lexeme);
if (method == null)
{
throw new LoxRuntimeException(expr.Method, $"Undefined property '{expr.Method.Lexeme}'.");
}
return(method);
}
public Object Visit_SuperExpr(SuperExpr expr)
{
int distance = _locals[expr];
LoxClass superclass = (LoxClass)_environment.GetAt(distance, "super");
// "this" is always one level nearer than "super"'s environment.
LoxInstance obj = (LoxInstance)_environment.GetAt(distance - 1, "this");
string name = (string)expr.method.value;
LoxFunction method = superclass.FindMethod(name);
if (method == null)
{
throw new RuntimeException(expr.method.line, expr.method.column, "Undefined property '" + name + "'.");
}
return(method.Bind(obj));
}
public string Visit_SuperExpr(SuperExpr expr)
{
return("super");
}
