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 object Call(Interpreter interpreter, List <object> arguments)
{
var environment = new EnvironmentScope(_closure);
for (var i = 0; i < _declaration.Parameters.Count; i++)
{
environment.Define(_declaration.Parameters[i].Lexeme, arguments[i]);
}
try
{
interpreter.ExecuteBlock(_declaration.Body, environment);
}
catch (Return @return)
{
return(@return.Value);
}
if (_isInitializer)
{
return(_closure.GetAt(0, "this"));
}
return(null);
}
