private static void TakeWhileSkip(ref PredicateContext <T, C> context, out Option <T> next)
{
context.bd.DetectBacktrack();
if (context.needsMove)
{
context.chained.skip(ref context.chained.context, out context.chained.current);
}
else
{
context.needsMove = true;
}
if (!context.chained.current.isSome)
{
next = context.chained.current;
context.bd.Release();
}
else if (context.predicate(context.chained.current.value))
{
next = context.chained.current;
}
else
{
next = new Option <T>();
context.bd.Release();
context.chained.dispose(ref context.chained.context, out context.chained.current);
}
}
private static void WhereSkip(ref PredicateContext <T, C> context, out Option <T> next)
{
context.bd.DetectBacktrack();
if (context.needsMove)
{
context.chained.skip(ref context.chained.context, out context.chained.current);
}
else
{
context.needsMove = true;
}
while (context.chained.current.isSome && !context.predicate(context.chained.current.value))
{
context.chained.skip(ref context.chained.context, out context.chained.current);
}
next = context.chained.current;
if (!next.isSome)
{
context.bd.Release();
}
}
private static void TakeWhileRemove(ref PredicateContext <T, C> context, out Option <T> next)
{
context.bd.DetectBacktrack();
context.needsMove = false;
context.chained.remove(ref context.chained.context, out context.chained.current);
TakeWhileSkip(ref context, out next);
}
private static void Dispose(ref PredicateContext <T, C> context, out Option <T> next)
{
next = new Option <T>();
context.bd.Release();
context.chained.dispose(ref context.chained.context, out context.chained.current);
}