public static EitherAsync <L, OptionAsync <B> > Traverse <L, A, B>(this OptionAsync <EitherAsync <L, A> > ma, Func <A, B> f)
{
return(new EitherAsync <L, OptionAsync <B> >(Go(ma, f)));
async Task <EitherData <L, OptionAsync <B> > > Go(OptionAsync <EitherAsync <L, A> > ma, Func <A, B> f)
{
var(isSome, value) = await ma.Data.ConfigureAwait(false);
if (!isSome)
{
return(EitherData.Right <L, OptionAsync <B> >(OptionAsync <B> .None));
}
var db = await value.Data.ConfigureAwait(false);
if (db.State == EitherStatus.IsBottom)
{
return(EitherData <L, OptionAsync <B> > .Bottom);
}
if (db.State == EitherStatus.IsLeft)
{
return(EitherData.Left <L, OptionAsync <B> >(db.Left));
}
return(EitherData.Right <L, OptionAsync <B> >(OptionAsync <B> .Some(f(db.Right))));
}
}
public static TryOptionAsync <OptionAsync <B> > Traverse <A, B>(this OptionAsync <TryOptionAsync <A> > ma, Func <A, B> f)
{
return(ToTry(() => Go(ma, f)));
async Task <OptionalResult <OptionAsync <B> > > Go(OptionAsync <TryOptionAsync <A> > ma, Func <A, B> f)
{
var(isSome, value) = await ma.Data.ConfigureAwait(false);
if (!isSome)
{
return(new OptionalResult <OptionAsync <B> >(OptionAsync <B> .None));
}
var rb = await value.Try().ConfigureAwait(false);
if (rb.IsFaulted)
{
return(new OptionalResult <OptionAsync <B> >(rb.Exception));
}
if (rb.IsNone)
{
return(OptionalResult <OptionAsync <B> > .None);
}
return(new OptionalResult <OptionAsync <B> >(OptionAsync <B> .Some(f(rb.Value.Value))));
}
}
public static async ValueTask <OptionAsync <B> > Traverse <A, B>(this OptionAsync <ValueTask <A> > ma, Func <A, B> f)
{
var(s, v) = await ma.Data.ConfigureAwait(false);
if (!s)
{
return(OptionAsync <B> .None);
}
var a = await v.ConfigureAwait(false);
return(OptionAsync <B> .Some(f(a)));
}
public static async Task <OptionAsync <B> > Traverse <A, B>(this OptionAsync <Task <A> > ma, Func <A, B> f)
{
var(s, v) = await ma.Data;
if (!s)
{
return(OptionAsync <B> .None);
}
var a = await v;
if (v.IsFaulted)
{
ExceptionDispatchInfo.Capture(v.Exception.InnerException).Throw();
}
return(OptionAsync <B> .Some(f(a)));
}
public void SetResult(A result) => Task = OptionAsync <A> .Some(result);