public Expression VisitSuper(SuperExpression node)
{
var name = "__value";
if (HoistedLocals.ContainsKey(name) == false)
{
HoistedLocals.Add(name, node);
}
return(node);
}
public object VisitSuper(SuperExpression node)
{
if (Target is object)
{
node.Type = TypeProvider.ObjectType;
return(NoTarget);
}
node.Type = Target.GetType().BaseType;
return(Target);
}
public object VisitSuperExpression(SuperExpression expression)
{
if (!scope.InClass)
{
Interpreter.ScopeError(expression.Keyword, "Cannot use 'super' outside of a class.");
}
else if (!scope.InSubclass)
{
Interpreter.ScopeError(expression.Keyword, "Cannot use 'super' in a class with no superclass.");
}
scope.ResolveValue(expression, expression.Keyword);
return(null);
}
public object VisitSuperExpression(SuperExpression expression)
{
var distance = locals[expression];
var superclass = (LoxClass)environment.Get(superToken, distance);
// "this" is always one level closer than "super"'s environment
var instance = (LoxInstance)environment.Get(thisToken, distance - 1);
var method = superclass[expression.Method.Lexeme];
if (method == null)
{
throw new LoxRunTimeException(expression.Method, $"Undefined property '{expression.Method.Lexeme}'.");
}
return(method.Bind(instance));
}