private static IEnumerable <RPack> Optional(RPack pack, Func <IEnumerable <RPack>, IEnumerable <RPack> > graphSelector, short parametersStartIndex, short parametersEndIndex)
{
var packBox = Enumerable.Repeat(pack, 1); // as RPackInt[] ?? packs.ToArray();
bool any = false;
foreach (var rPackInt in graphSelector(packBox))
{
yield return(rPackInt);
if (!any)
{
any = true;
}
}
if (!any)
{
yield return(pack.ResetDiapason(parametersStartIndex, parametersEndIndex));
}
}
private static IEnumerable <RPack> UnionRun(RPack pack, Func <IEnumerable <RPack>, IEnumerable <RPack> > first, Func <IEnumerable <RPack>, IEnumerable <RPack> > second)
{
var rPackIntBox = Enumerable.Repeat(pack, 1);
if (first != null)
{
foreach (var resultRPackInt in first(rPackIntBox))
{
yield return(resultRPackInt);
}
}
if (second == null)
{
yield break;
}
foreach (var resultRPackInt in second(rPackIntBox))
{
yield return(resultRPackInt);
}
}