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This allows the non-U2 systems to use the same $DEFINE $UNDEFINE $IFDEF $IFNDEF $ELSE and $ENDIF compiler directives as U2 systems and QM.

<PRE>
      PROGRAM PREPASS
*
* Utility program to pre-pass programs to use the same $DEFN stuff
* as UNIVERSE UNIDATA and QM.  Note that the string '!@#$' used in
* the first four positions are removed as it does a pass.
*
* Keith Johnson
* The code is supplied on an as-is basis as a source-code resource.
* No representation whatever is made as to the operation of the program.
*
* This code SEEMS to run correctly, but I haven't done a lot
* of checking.  The  variable THIS can be pre-set to your own
* system (For example, R83 or D3) so that you seem to always
* have "$DEFINE R83" or "$DEFINE D3" in your code.
*
* Added test of FIRST[1,1] being '#' to allow #DEFINE, etc.
* and added conversion 'MCU' to allow #define, etc. (KRJ 12 Oct 2006)
*
* Fixed bugs BELL not defined, read from FILE should be INFILE
* Changed to write back to sam place (KRJ 11 July 2012)

      GOOD = (1=1)
      EVIL = NOT(GOOD)
      BELL = CHAR(7)

      PREF = '!@#$'
      THIS = 'YOURSYSTEM'
      THAT = GOOD
      NUMT = 1

      SHOW = GOOD
      LIST = ''
      NUML = 0

      LOOP
         CRT 'Enter file :':
         INPUT FILE
         IF FILE EQ '' THEN CRT; STOP
         GAIN = EVIL
         OPEN FILE TO INFILE THEN GAIN = GOOD ELSE
            CRT BELL:' Cannot open the file ':FILE
         END
      UNTIL GAIN DO
      REPEAT

      LOOP
         CRT 'Enter item name :':
         INPUT NAME
         IF NAME EQ '' THEN CRT; STOP
         GAIN = EVIL
         READ ITEM FROM INFILE, NAME THEN GAIN = GOOD ELSE
            CRT BELL:'  Cannot read item ':NAME
         END
      UNTIL GAIN DO
      REPEAT


      XXCNT = DCOUNT(ITEM,@AM)
      NEW1 = ''
      FOR XX = 1 TO XXCNT
         LINE = ITEM<XX>
         IF LINE[1,4] = PREF THEN LINE = LINE[5,99999]
         LIN = TRIM(LINE)
         FIRST = FIELD(LIN,' ',1)
         IF FIRST[1,1] = '$' or FIRST[1,1] = '#' THEN
            FIRST = '$':OCONV(FIRST[2,99],'MCU')
            GOSUB DOIT
         END ELSE
            IF SHOW ELSE LINE = PREF:LINE
         END
         NEW1<XX> = LINE
      NEXT XX
      WRITE NEW1 ON INFILE, NAME
      STOP


DOIT:
      SECOND = FIELD(LIN,' ',2)
      BEGIN CASE
         CASE FIRST = '$DEFINE'
            LOCATE SECOND IN THIS<1> SETTING POSN THEN
               THAT<POSN> = GOOD
            END ELSE
               NUMT += 1
               THIS<NUMT> = SECOND
               THAT<NUMT> = GOOD
            END
            LINE = PREF:LINE
            RETURN
         CASE FIRST = '$UNDEFINE'
            LOCATE SECOND IN THIS<1> SETTING POSN THEN
               THAT<POSN> = EVIL
            END ELSE
               NUMT += 1
               THIS<NUMT> = SECOND
               THAT<NUMT> = EVIL
            END
            LINE = PREF:LINE
            RETURN
         CASE FIRST = '$IFDEF'
            LOCATE SECOND IN THIS<1> SETTING POSN THEN
               TEMP = THAT<POSN>
            END ELSE TEMP = EVIL
            NUML += 1
            LIST<NUML> = TEMP
         CASE FIRST = '$IFNDEF'
            LOCATE SECOND IN THIS<1> SETTING POSN THEN
               TEMP = NOT(THAT<POSN>)
            END ELSE TEMP = GOOD
            NUML += 1
            LIST<NUML> = TEMP
         CASE FIRST = '$ENDIF'
            IF NUML LT 1 THEN RETURN
            DEL LIST<NUML>
            NUML -= 1
         CASE FIRST = '$ELSE'
            LIST<NUML> = NOT(LIST<NUML>)
         CASE 1
            IF SHOW ELSE LINE = PREF:LINE
            RETURN
      END CASE
      LINE = PREF:LINE
      SHOW = GOOD
      FOR YY = 1 TO NUML
         IF NOT(LIST<YY>) THEN
            SHOW = EVIL
            RETURN
         END
      NEXT YY
      RETURN
</PRE>


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