Syntax Error Fix Required for the (Updated) Filtered Connors RSI in AFL AmiBroker - syntax-error

Question

Here is the updated AFL for "Filtered Connors RSI" -
_SECTION_BEGIN("Filtered Connors RSI Final");
ma_length = Param("MA Length", 14, 3, 100);
c_length = Param("C Length", 3, 1, 100);
ud_length = Param("UD Length", 2, 1, 100);
roc_length = Param("ROC Length", 100, 1, 100);
function updown(input)
{
s = Close;
isEqual = s == Ref(s, -1);
isGrowing = s > Ref(s, -1);
ud = StaticVarGet("UD Self-Referencing", align=True);
ud = IIf(isEqual == 0, isGrowing, IIf(Nz(Ref(ud, -1)) <= 0, 1, Nz(Ref(ud, -1) + 1), IIf(Nz(Ref(ud, -1)) >= 0, -1, Nz(Ref(ud, -1) - 1)), Null);
return ud;
}
function RSIt(ARRAY, range)
{
return RSIa(Close, c_length);
}
function CRSI(Close, c_length, ud_length, roc_length)
{
updn = RSIa(updown(Close), c_length);
tRSI = RSIa(Close, c_length);
updownrsi = RSIt(updn, ud_length);
ptrk = PercentRank(ROC(Ref(Close, -1)), roc_length);
return (tRSI + updownrsi + ptrk)/3;
}
rsi_open = crsi( Open, c_length, ud_length, roc_length);
rsi_high = crsi( High, c_length, ud_length, roc_length);
rsi_low = crsi( Low, c_length, ud_length, roc_length);
rsi_close = crsi( Close, c_length, ud_length, roc_length);
function HaClose(O, H, L, C)
{
return (O + H + L + C) / 4;
}
source = HaClose(rsi_open, rsi_high, rsi_low, rsi_close);
fcrsi = TEMA(source, ma_length);
PlotGrid(70, colorGreen, pattern=10, width=1, label=True);
PlotGrid(60, colorPlum, pattern=9, width=1, label=True);
PlotGrid(50, colorBrown, pattern=9, width=1, label=True);
PlotGrid(40, colorPlum, pattern=9, width=1, label=True);
PlotGrid(30, colorRed, pattern=10, width=1, label=True);
Plot(fcrsi, "Filtered Connors RSI", colorBlue, styleLine|styleThick);
//Rescaling
Plot(100, "", colorWhite,styleLine|styleNoDraw|styleNoLabel);
Plot(0, "", colorWhite,styleLine|styleNoDraw|styleNoLabel);
_SECTION_END();
Here is the error -
Error 31. Syntax error, unexpected ';', expecting ')' or','
The line of pine script code based on the "Ternary Operator" I am trying to code with the "IIf" function in AFL is as follows -
ud := isEqual ? 0 : isGrowing ? (nz(ud[1]) <= 0 ? 1 : nz(ud[1])+1) :
(nz(ud[1]) >= 0 ? -1 : nz(ud[1])-1)
The pine script code snippet consists the whole function is as follows -
updown(float s) =>
isEqual = s == s[1]
isGrowing = s > s[1]
ud = 0.0
ud := isEqual ? 0 : isGrowing ? (nz(ud[1]) <= 0 ? 1 : nz(ud[1])+1) : (nz(ud[1]) >= 0 ? -1 : nz(ud[1])-1)
ud
Please help me to fix this. Regards.