帮忙写个指标 (文华财经WH6赢顺V6.7)

参考：

HY:=BACKSET(ISLASTBAR,SUMBARS(DAYSTOEXPIRED(')=1,3));
HT:=BARSLAST(DAYSTOEXPIRED(')=1)+1,NODRAW;
//BARSLAST(HT=1),NODRAW;
DRAWLINE3(DAYSTOEXPIRED(')=1&&HY,H,0,DAYSTOEXPIRED(')=1&&HY,H+1,0,1),RGB(100,100,100),DOT;
DRAWLINE3(DAYSTOEXPIRED(')=1&&HY,L,0,DAYSTOEXPIRED(')=1&&HY,L-1,0,1),RGB(100,100,100),DOT;

BB:=DAYSTOEXPIRED(')=1&&BACKSET(ISLASTBAR,SUMBARS(DAYSTOEXPIRED(')=1,2));
AA:=DAYSTOEXPIRED(')=1&&BACKSET(ISLASTBAR,SUMBARS(DAYSTOEXPIRED(')=1,3));
BBB:REF(BARSLAST(BB)+1,SUMBARS(DAYSTOEXPIRED(')=1,1)),NODRAW;//B段的K线数量
AAA:REF(BARSLAST(AA)+1,SUMBARS(DAYSTOEXPIRED(')=1,2)),NODRAW;//A段的K线数量
SS:COUNT(DAYSTOEXPIRED(')=1,BARPOS),NODRAW;//总共有几段（上市开始）