public override bool MoveNext()
{
switch (_state)
{
case Start:
_chain = _link.Compose(this);
_link = null;
_outer = _consumable.GetEnumerator();
_consumable = null;
_state = OuterEnumeratorMoveNext;
goto case OuterEnumeratorMoveNext;
case OuterEnumeratorMoveNext:
if (_outer.MoveNext())
{
_inner = _outer.Current.GetEnumerator();
if (ReferenceEquals(_chain, this))
{
_state = InnerEnumeratorMoveNextOnSelf;
goto case InnerEnumeratorMoveNextOnSelf;
}
else
{
_state = InnerEnumeratorMoveNext;
goto case InnerEnumeratorMoveNext;
}
}
_state = Completing;
goto case Completing;
case InnerEnumeratorMoveNextOnSelf:
if (!_inner.MoveNext())
{
_inner.Dispose();
_inner = default;
_state = OuterEnumeratorMoveNext;
goto case OuterEnumeratorMoveNext;
}
Result = (V)(object)_inner.Current; // should be no-op as TResult should equal T
return(true);
case InnerEnumeratorMoveNext:
if (_inner.MoveNext())
{
_status = _chain.ProcessNext(_inner.Current);
if (_status.IsFlowing())
{
_state = CheckStopped;
return(true);
}
_state = CheckStopped;
goto case CheckStopped;
}
_inner.Dispose();
_inner = null;
_state = OuterEnumeratorMoveNext;
goto case OuterEnumeratorMoveNext;
case CheckStopped:
if (_status.IsStopped())
{
_inner.Dispose();
_inner = null;
_state = Completing;
goto case Completing;
}
_state = InnerEnumeratorMoveNext;
goto case InnerEnumeratorMoveNext;
case Completing:
if (_chain.ChainComplete(status & ~ChainStatus.Flow).NotStoppedAndFlowing())
{
_state = Finished;
return(true);
}
goto case Finished;
case Finished:
Result = default;
_outer.Dispose();
_outer = null;
_chain.ChainDispose();
_chain = null;
_state = PostFinished;
goto default;
default:
return(false);
}
}
