一小段tradingview的代碼轉成XS是否可行

小編您好，想請問下面這段pinescript轉成xs代碼是可行的嗎

是需要用到currentbar 和自訂2個函數嗎(xrc中len有5和3兩種)

看了有點迷糊，跪求提示

____________________________

sa(src,len,wei) =>

    sumf = 0.0

    ma = 0.0

    out = 0.0

    sumf  :=  nz(sumf[1]) - nz(src[len]) + src

    ma  :=  na(src[len]) ? na : sumf/len

    out  :=  na(out[1]) ? ma : (src*wei+out[1]*(len-wei))/len

    out

//set up a simple model of banker fund flow trend   

fundtrend = ((3*xsa((close- lowest(low,27))/(highest(high,27)-lowest(low,27))*100,5,1)-2*xsa(xsa((close-lowest(low,27))/(highest(high,27)-lowest(low,27))*100,5,1),3,1)-50)*1.032+50)