PI Code required for below mentioned AFL

Algos, strategies, code
1 
//------------------------------------------------------
//
//  Formula Name:    Donchian Channel trading System
//  Author/Uploader: Trading Tuitions
//  E-mail:          [email protected]
//  Website:         www.tradingtuitions.com
//------------------------------------------------------

_SECTION_BEGIN("Donchian Channel trading System");

SetChartOptions(0,chartShowArrows|chartShowDates);
_N(Title = StrFormat("{{NAME}} - {{INTERVAL}} {{DATE}} Open %g, Hi %g, Lo %g, Close %g (%.1f%%) {{VALUES}}", O, H, L, C ));

//Initial Parameters
SetTradeDelays( 0,0,0, 0 );
SetOption( "InitialEquity", 200000);
SetOption("FuturesMode" ,True);
SetOption("MinShares",1);
SetOption("CommissionMode",2);
SetOption("CommissionAmount",100);
SetOption("AccountMargin",10);
SetOption("RefreshWhenCompleted",True);
SetPositionSize(150,spsShares);
SetOption( "AllowPositionShrinking", True );

Plot( Close, "Price", colorWhite, styleCandle );

pds=Param("DonchianPeriods",5,5,100,5);
DonchianUpper =HHV(Ref(H,-1),pds);
DonchianLower = LLV(Ref(L,-1),pds);
DonchianMiddle = (DonchianUpper+DonchianLower)/2;
 
printf("\nDonchianUpper : " + DonchianUpper );  
printf("\nDonchianLower : " + DonchianLower );  
printf("\nDonchianMiddle : " + DonchianMiddle );  

Plot(DonchianUpper,"DU",colorBlue,styleLine);
Plot(DonchianMiddle,"DM",colorGreen,styleLine);
Plot(DonchianLower,"DL",colorRed,styleLine);

ATRMultiplier=Param("ATRMultiplier",5,1,5,1);
ATRPeriods=Param("ATRPeriods",25,5,25,1);

Buy=Cross(High,DonchianUpper);
Short=Cross(DonchianLower,Low);
Sell=Cross(DonchianMiddle,Low);
Cover=Cross(High,DonchianMiddle);

BuyPrice=DonchianUpper;
SellPrice=DonchianMiddle;
ShortPrice=DonchianLower;
CoverPrice=DonchianMiddle;

Buy = ExRem(Buy,Sell);
Sell = ExRem(Sell,Buy);
Short=ExRem(Short,Cover);
Cover=ExRem(Cover,Short);

ApplyStop(stopTypeTrailing, stopModePoint, ATRMultiplier*ATR(ATRPeriods), True, True );

printf("\nBuy : " + Buy );  
printf("\nSell : " + Sell );  
printf("\nShort : " + Short );  
printf("\nCover : " + Cover );  

/* Plot Buy and Sell Signal Arrows */
PlotShapes(IIf(Buy, shapeSquare, shapeNone),colorGreen, 0, L, Offset=-25);
PlotShapes(IIf(Buy, shapeSquare, shapeNone),colorLime, 0,L, Offset=-35);
PlotShapes(IIf(Buy, shapeUpArrow, shapeNone),colorWhite, 0,L, Offset=-30);
PlotShapes(IIf(Short, shapeSquare, shapeNone),colorRed, 0, H, Offset=25);
PlotShapes(IIf(Short, shapeSquare, shapeNone),colorOrange, 0,H, Offset=35);
PlotShapes(IIf(Short, shapeDownArrow, shapeNone),colorWhite, 0,H, Offset=-30);
PlotShapes(IIf(Sell, shapeStar, shapeNone),colorGold, 0, L, Offset=-15);
PlotShapes(IIf(Cover, shapeStar, shapeNone),colorGold, 0,L, Offset=-15);

_SECTION_END();
2

Donchian Channel function is not available in tradescript as of now.