// Take/Until
public static IEnumerable <T> TakeUntil <T>(this PeekableEnumerator <T> enumerator, Predicate <T> predicate)
{
// false, false, [break], true
while (enumerator.TakeIfNot(predicate, out var value))
{
yield return(value);
}
}
public static bool TakeIfNot <T>(this PeekableEnumerator <T> enumerator, Predicate <T> predicate, [MaybeNullWhen(false)] out T value)
{
if (enumerator.PeekNext(out var next) && !predicate(next))
{
return(enumerator.MoveNext(out value));
}
value = default;
return(false);
}
public static IEnumerable <T> TakeSliceByLast <T>(this PeekableEnumerator <T> enumerator, Predicate <T> isLast)
{
// first, last, [break]
while (enumerator.MoveNext(out var curr))
{
yield return(curr);
if (isLast(curr))
{
yield break;
}
}
}
