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A few years in the past, Matt left a place the place he developed in FORTRAN, and went off to do different issues. The corporate employed a alternative, and since nobody else actually understood FORTRAN, they assumed issues have been high quality. Over the course of a decade, their growth prices bought dearer, their software program bought buggier, and deadlines began flying by and not using a single new characteristic being launched. It took a very long time, however they ultimately fired Matt's alternative. Since Matt was in search of a brand new place round that point, he ended up again within the FORTRAN store: simply when he thought he was out, they pulled him again in.
Matt began going via the code that'd been carried out, and… properly, right here's an instance perform signature:
SUBROUTINE TREND_ORA_GET (AASTAT, DATATYPE, ORA_CODE
> , MON, YEAR, IN_OPTION, OUT_ARRAY)
Now, if you happen to're studying this, you may assume OUT_ARRAY is an output parameter. You'd be mistaken. It's simply the identify of an array which occurs to be outlined in Frequent (which is Fortran's time period for world variables).
Inside this subroutine, the code begins by fetching some knowledge from a database, after which begins doing issues like:
IF (OUT_ARRAY(1:1) .EQ. 'G') THEN
IF (OUT_ARRAY .EQ. 'GRP ') THEN
DO I = 1, NID
RNUM = TBLITEMS (I)
IF (RNUM .LE. max_results) THEN
GRP (RNUM) = TBLDATA (I)
ENDIF
! IF (RNUM .LT.10) THEN
! WRITE (*,*) 'GRP(RNUM) = ',GRP(RNUM),TBLDATA(I)
! ENDIF
ENDDO
ENDIF
ENDIF
The primary line, there, accesses the primary ingredient of the array, and compares it to G– it's a "begins with" verify. If it begins with G, then we verify if the array is the same as GRP . Why the additional begins with? My solely guess is that it's a micro-optimization to reduce the linear search on string comparisons.
If the array is GRP , then we loop from 1 to NID, and pull knowledge out of the TBLITEMS assortment, accumulating them right into a GRP assortment. Why? I do not know. The traces marked wit h! are feedback.
However we do that many, many extra occasions, full with the optimization(?) of checking the primary character in OUT_ARRAY.
IF (OUT_ARRAY(1:1) .EQ. 'M') THEN
IF (OUT_ARRAY .EQ. 'M6R ') THEN
DO I = 1, NID
RNUM = TBLITEMS (I)
IF (RNUM .LE. MAX_RESULTS) THEN
M6R (RNUM) = TBLDATA (I)
ENDIF
IF ((RNUM .EQ. 43357) .OR. (RNUM .EQ.43358)) THEN
M6R (RNUM) = TBLDATA (I)
! WRITE (*,*) 'M6R(RNUM) = ',M6R(RNUM),'RNUM = ',RNUM,TBLDATA(I)
ENDIF
ENDDO
ELSE IF (OUT_ARRAY .EQ. 'M5R ') THEN
DO I = 1, NID
RNUM = TBLITEMS (I)
IF (RNUM .LE. MAX_RESULTS) THEN
M5R (RNUM) = TBLDATA (I)
ENDIF
IF ((RNUM .EQ. 43357) .OR. (RNUM .EQ.43358)) THEN
M5R (RNUM) = TBLDATA (I)
! WRITE (*,*) 'M5R(RNUM) = ',M5R(RNUM),'RNUM = ',RNUM,TBLDATA(I)
ENDIF
ENDDO
ELSE IF (OUT_ARRAY .EQ. 'M4R ') THEN
DO I = 1, NID
RNUM = TBLITEMS (I)
IF (RNUM .LE. MAX_RESULTS) THEN
M4R (RNUM) = TBLDATA (I)
ENDIF
IF ((RNUM .EQ. 43357) .OR. (RNUM .EQ.43358)) THEN
M4R (RNUM) = TBLDATA (I)
! WRITE (*,*) 'M4R(RNUM) = ',M6R(RNUM),'RNUM = ',RNUM,TBLDATA(I)
ENDIF
ENDDO
ELSE IF (OUT_ARRAY .EQ. 'M3R ') THEN
DO I = 1, NID
RNUM = TBLITEMS (I)
IF (RNUM .LE. MAX_RESULTS) THEN
M3R (RNUM) = TBLDATA (I)
ENDIF
IF ((RNUM .EQ. 43357) .OR. (RNUM .EQ.43358)) THEN
M3R (RNUM) = TBLDATA (I)
! WRITE (*,*) 'M3R(RNUM) = ',M3R(RNUM),'RNUM = ',RNUM,TBLDATA(I)
ENDIF
ENDDO
ELSE IF (OUT_ARRAY .EQ. 'M2R ') THEN
! write (*,*)'NID = ', nid
DO I = 1, NID
RNUM = TBLITEMS (I)
IF (RNUM .LE. MAX_RESULTS) THEN
M2R (RNUM) = TBLDATA (I)
ENDIF
! If (tblitems (i) .gt. 60000) then
! write(*,*) 'tblitems(i) = ',tblitems(i), 'I = ',i
! endif
IF ((RNUM .EQ. 43357) .OR. (RNUM .EQ.43358)) THEN
M2R (RNUM) = TBLDATA (I)
! WRITE (*,*) 'M2R(RNUM) = ',M2R(RNUM),'RNUM = ',RNUM,TBLDATA(I)
ENDIF
ENDDO
ELSE IF (OUT_ARRAY .EQ. 'M1R ') THEN
DO I = 1, NID
RNUM = TBLITEMS (I)
IF (RNUM .LE. MAX_RESULTS) THEN
M1R (RNUM) = TBLDATA (I)
ENDIF
IF ((RNUM .EQ. 43357) .OR. (RNUM .EQ.43358)) THEN
M1R (RNUM) = TBLDATA (I)
! WRITE (*,*) 'M1R(RNUM) = ',M1R(RNUM),'RNUM = ',RNUM,TBLDATA(I)
ENDIF
ENDDO
ENDIF
ENDIF
IF (OUT_ARRAY(1:1) .EQ. 'Y') THEN
IF (OUT_ARRAY .EQ. 'Y1R ') THEN
DO I = 1, NID
RNUM = TBLITEMS (I)
IF (RNUM .LE. MAX_RESULTS) THEN
Y1R (RNUM) = TBLDATA (I)
ENDIF
ENDDO
ELSE IF (OUT_ARRAY .EQ. 'Y2R ') THEN
DO I = 1, NID
RNUM = TBLITEMS (I)
IF (RNUM .LE. MAX_RESULTS) THEN
Y2R (RNUM) = TBLDATA (I)
ENDIF
ENDDO
ELSE IF (OUT_ARRAY .EQ. 'Y5R ') THEN
DO I = 1, NID
RNUM = TBLITEMS (I)
IF (RNUM .LE. MAX_RESULTS) THEN
Y5R (RNUM) = TBLDATA (I)
ENDIF
ENDDO
ENDIF
ENDIF
IF (OUT_ARRAY(1:1) .EQ. 'R') THEN
IF (OUT_ARRAY .EQ. 'R6R ') THEN
DO I = 1, NID
RNUM = TBLITEMS (I)
IF (RNUM .LE. MAX_RESULTS) THEN
R6R (RNUM) = TBLDATA (I)
ENDIF
ENDDO
ELSE IF (OUT_ARRAY .EQ. 'R5R ') THEN
DO I = 1, NID
RNUM = TBLITEMS (I)
IF (RNUM .LE. MAX_RESULTS) THEN
R5R (RNUM) = TBLDATA (I)
ENDIF
ENDDO
ELSE IF (OUT_ARRAY .EQ. 'R4R ') THEN
DO I = 1, NID
RNUM = TBLITEMS (I)
IF (RNUM .LE. MAX_RESULTS) THEN
R4R (RNUM) = TBLDATA (I)
ENDIF
ENDDO
ELSE IF (OUT_ARRAY .EQ. 'R3R ') THEN
DO I = 1, NID
RNUM = TBLITEMS (I)
IF (RNUM .LE. MAX_RESULTS) THEN
R3R (RNUM) = TBLDATA (I)
ENDIF
ENDDO
ELSE IF (OUT_ARRAY .EQ. 'R2R ') THEN
DO I = 1, NID
RNUM = TBLITEMS (I)
IF (RNUM .LE. MAX_RESULTS) THEN
R2R (RNUM) = TBLDATA (I)
ENDIF
ENDDO
ELSE IF (OUT_ARRAY .EQ. 'R1R ') THEN
DO I = 1, NID
RNUM = TBLITEMS (I)
IF (RNUM .LE. MAX_RESULTS) THEN
R1R (RNUM) = TBLDATA (I)
ENDIF
ENDDO
ENDIF
ENDIF
IF (OUT_ARRAY(2:2) .EQ. 'Y') THEN
IF (OUT_ARRAY .EQ. 'PY5R') THEN
DO I = 1, NID
RNUM = TBLITEMS (I)
IF (RNUM .LE. MAX_RESULTS) THEN
PY5R (RNUM) = TBLDATA (I)
ENDIF
ENDDO
ELSE IF (OUT_ARRAY .EQ. 'ZY1R') THEN
DO I = 1, NID
RNUM = TBLITEMS (I)
IF (RNUM .LE. MAX_RESULTS) THEN
ZY1R (RNUM) = TBLDATA (I)
ENDIF
ENDDO
ELSE IF (OUT_ARRAY .EQ. 'RY1R') THEN
DO I = 1, NID
RNUM = TBLITEMS (I)
IF (RNUM .LE. MAX_RESULTS) THEN
RY1R (RNUM) = TBLDATA (I)
ENDIF
ENDDO
ELSE IF (OUT_ARRAY .EQ. 'RY5R') THEN
DO I = 1, NID
RNUM = TBLITEMS (I)
IF (RNUM .LE. MAX_RESULTS) THEN
RY5R (RNUM) = TBLDATA (I)
ENDIF
ENDDO
ELSE IF (OUT_ARRAY .EQ. 'RY6R') THEN
DO I = 1, NID
RNUM = TBLITEMS (I)
IF ((RNUM .GE. 15722) .AND. (RNUM .LE.15727)) THEN
RY6R (RNUM) = TBLDATA (I)
! WRITE (*,*) 'RY6R(RNUM) = ',RY6R(RNUM),'RNUM = ',RNUM,TBLDATA(I)
ENDIF
IF ((RNUM .GE. 41708) .AND. (RNUM .LE.41759)) THEN
RY6R (RNUM) = TBLDATA (I)
! WRITE (*,*) 'RY6R(RNUM) = ',RY6R(RNUM),'RNUM = ',RNUM,TBLDATA(I)
ENDIF
ENDDO
ENDIF
ENDIF
IF (OUT_ARRAY .EQ. 'TOT ') THEN
DO I = 1, NID
RNUM = TBLITEMS (I)
IF (RNUM .LE. MAX_RESULTS) THEN
TOT (RNUM) = TBLDATA (I)
ENDIF
ENDDO
ELSE IF (OUT_ARRAY .EQ. 'RTOT') THEN
DO I = 1, NID
RNUM = TBLITEMS (I)
IF (RNUM .LE. MAX_RESULTS) THEN
RTOT (RNUM) = TBLDATA (I)
ENDIF
ENDDO
ENDIF
I really like this code pattern, as a result of I don't know Fortran, and it's nonetheless straightforward to see that this code is dangerous. It's repetitive, it's cryptic, and it's clearly fragile and tough to switch. Matt provides:
The true WTF is, after all, that we're nonetheless utilizing FORTRAN. That's as a result of the client nonetheless insists on their experiences being produced on fan-feed line-printer (chunka-chunka-chunka) paper 122-columns broad and many others. and many others.
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