Meastock swing indicator

SWING INDICATOR WITH EXPIRY DATE (CAN BE MODIFIED) -

Stop1:=If( PREV < L,
If(( H - 4.5*ATR(21) ) >= PREV,
( H - 4.5*ATR(21) ),
PREV),
( H - 4.5*ATR(21) ));

Stop2:=If( PREV < L,
If(( C - 3.5*ATR(21) ) >= PREV,
( C - 3.5*ATR(21) ),
PREV),
( C - 3.5*ATR(21) ));

StopLong:=If(Stop1>Stop2,Stop1,Stop2);

Stop1:=If( PREV > H,
If(( L + 4*ATR(21) ) <= PREV,
( L + 4*ATR(21) ),
PREV),
( L + 4*ATR(21) ));

Stop2:=If( PREV > H,
If(( C + 3.5*ATR(21) ) <= PREV,
( C + 3.5*ATR(21) ),
PREV),
( C + 3.5*ATR(21) ));

StopShort:=If(Stop1<Stop2,Stop1,Stop2);

If( ((Year()<=2014) OR (Year()=2014 AND Month()<=12 AND DayOfMonth()<=31)),
If((BarsSince(L<Ref(StopLong,-1))>BarsSince(H>Ref(StopShort,-1)) ),StopLong,StopShort),C);