IMPLEMENTATION MODULE PrinterUtils;
(*
 *  ModBase
 *  Release 3.0
 *  (c) Copyright 1986 - 1991 PMI
 *  P.O. Box 8402
 *  Green Bay Wi 53308
 *  All Rights Reserved
 *  by Ed Ross  
 *)

FROM SYSTEM IMPORT BYTE,ADR;
FROM DateFunctions IMPORT Date,DateToStr;
FROM StrConv IMPORT RealToStr,CardinalToStr,IntegerToStr,LongIntegerToStr;
FROM StringIO IMPORT WriteEol;
FROM M2Strings IMPORT Length,Assign;
FROM StrEdit IMPORT Center,RightJustify,CrunchBlanks,Append,MakeCurrency;
FROM Storage  IMPORT ALLOCATE,DEALLOCATE;
FROM NumTypes IMPORT Real8;
FROM LowLevel IMPORT Fill;

TYPE DisplayLine = POINTER TO DisplayRec;

DisplayRec =  RECORD
  Str : POINTER TO ARRAY[0..300] OF CHAR;
  NbrBytes : CARDINAL;
END;

PROCEDURE OverWrite(obj : ARRAY OF CHAR; VAR targ : ARRAY OF CHAR; Pos : CARDINAL);

VAR
 J : CARDINAL;
 K : CARDINAL;
BEGIN
 K := Length(obj) + Pos;
 IF K > Length(targ)
   THEN K := Length(targ)
   ELSE K := Length(obj)
   END;
 FOR J := 0 TO Length(obj) -1 DO
   targ[Pos + J] := obj[J];
 END;

END OverWrite;

PROCEDURE SetupDisplayLine(VAR PL : DisplayLine; NbrOfCols:CARDINAL);
BEGIN
  ALLOCATE(PL,SIZE(PL^));
  PL^.NbrBytes := NbrOfCols + 2;
  ALLOCATE(PL^.Str,PL^.NbrBytes);

  ClearDisplayLine(PL);
END SetupDisplayLine;


PROCEDURE RemoveDisplayLine(VAR PL : DisplayLine);
BEGIN
  DEALLOCATE(PL^.Str,PL^.NbrBytes);
  DEALLOCATE(PL,SIZE(PL^));
  PL := NIL;
END RemoveDisplayLine;


PROCEDURE AddPrintElemt(VAR PL: DisplayLine; elemt: ARRAY OF BYTE; PT : CHAR;
          ColNbr, NbrCols : CARDINAL; Justification : CHAR);
TYPE
  DTypes  = RECORD
    CASE : CHAR OF
     'R' : R : Real8;
    |'I' : I : INTEGER;
    |'L' : L : LONGINT;
    |'C' : C : CARDINAL;
    |'D' : D : Date;
    |'S' : S : ARRAY[0..300] OF CHAR; (* string *)
    |'$' : Dollar : Real8;   (* Prefix with $ dollar type *)
    |'%' : Percent :Real8;   (* percent type  suffix with '%'*)
   END;
 END;
 CharSet = SET OF CHAR;
VAR
  P : POINTER TO DTypes;
  S : ARRAY [0..300] OF CHAR;
  ok : BOOLEAN;
BEGIN	
  P := ADR(elemt);
  P^.S[NbrCols] :=0C;
  CASE PT OF (* first go through the conversions *)
   'R','%','$' : RealToStr(P^.R,2,NbrCols,S);
  |'I' : IntegerToStr(P^.I,NbrCols,S);
  |'C' : CardinalToStr(P^.C,NbrCols,S);
  |'L' : LongIntegerToStr(P^.L,NbrCols,S);
  |'D' : DateToStr(P^.D,S,ok);
         IF NOT ok
	   THEN S:= '?????'
	   END;
  END;
  IF PT IN CharSet{'R','I','C','L','D','%'}
    THEN
      Assign( S,P^.S);
     END;
  IF PT = '%'
      THEN  Append(P^.S,'%');
    ELSIF PT = 'R'
      THEN
        MakeCurrency('$',P^.S);
	Assign( P^.S,S);  (* kluge here *)
        RightJustify(S,NbrCols);	
	Assign(S,P^.S );

  END;

  CASE Justification OF
   'C' : Center(P^.S,NbrCols);
  |'R' : RightJustify(P^.S,10);
  END;
  OverWrite(P^.S,PL^.Str^,ColNbr);
  S := S;  (* debug stop *)
END AddPrintElemt;
	
PROCEDURE PrintDisplayLine(PL : DisplayLine; Handle : CARDINAL);
BEGIN
  WriteEol(Handle,PL^.Str^);
END PrintDisplayLine;

PROCEDURE GetDisplayLine(PL : DisplayLine; VAR Display : ARRAY OF CHAR);
BEGIN
  Assign(PL^.Str^,Display );
END GetDisplayLine;

PROCEDURE ClearDisplayLine(VAR PL : DisplayLine);	
BEGIN
  Fill(ADR(PL^.Str^),PL^.NbrBytes-1,' ');
  PL^.Str^[PL^.NbrBytes-1] := CHR(0);
END ClearDisplayLine;

END PrinterUtils.