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Text File | 1983-06-18 | 5KB | 139 lines

            BASCONV--A FORTRAN-TO-BASIC CONVERSION AID
                           BY JIM GLASS


BASCONV  is  a  program for converting IBM-PC Basic programs into
Microsoft or IBM Fortran. It will not perform every detail of the
conversion  for  you,  but will perform the bulk of the drudgery.
Careful  inspection  and editing of the resulting output file are
vital if you wish to obtain a working Fortran program.

BASCONV  is  easy  to use. It asks you for the name of the source
(Basic)  file, the target (Fortran) file, and if you wish to have
the  source  displayed  as  it is being converted. All file names
must be supplied complete with drive identifier and extension, if
any.  In  addition  to these files, BASCONV also builds a working
file,  called  WORK,  on  the  current default drive. It DOES NOT
delete the WORK file when the conversion is complete.

BASCONV is fairly smart.  Among the things it can do are:

         Change  FOR/NEXT  loops  into  DO  loops.
         BASCONV  supplies target line numbers for
         the terminating CONTINUE if necessary.

         Change WHILE/WEND loops into IF..CONTINUE
         loops.

         Change  ON  n  GOTO  statements into GOTO
         (...)  n  type statements. ON...GOSUB and
         GOSUBS in general are NOT converted.

         Fully parse IF..THEN..ELSE statements and
         convert  into  equivalent Fortran logical
         IF statements or IF blocks. An IF without
         an ELSE becomes a pure logical IF.

         Handle     OPEN..FOR..AS     and     OPEN
         mode,file,... statements, converting them
         into Fortran OPEN statements.

         Detect   ALL   implicit  declarations  of
         variables,     and    provide    explicit
         declarations  at  the  beginning  of  the
         Fortran source.

         Convert  all  keywords,  such  as ATN, to
         equivalents,  such  as  ATAN.  Also parse
         statements  such  as  x MOD y and convert
         into statements such as AMOD(x,y).

         Remove  all  Basic  line  numbers, except
         where  lines  are  explicitly referenced.
         These   line   numbers   become   Fortran
         statement labels.

         Break  all  mulit-statement  Basic  lines
         into   single  statements  and  move  all
         source code into column seven as required
         by Fortran.

         Convert all double-quotes (") into single
         quotes (').

         Convert  Basic  exponentiation  (^)  into
         Fortran exponentiation (**).

         Provide  Fortran  statement functions for
         the Basic logical functions IMP, XOR, and
         EQV.

         Converts  PRINT  and  LPRINT  as  well as
         PRINT# and WRITE# statements into Fortran
         equivalents.

         Inserts  appropriate  code to convert the
         Basic    SWAP    keyword   into   Fortran
         statements.

         Converts  all  Basic relational operators
         such  as <,>,=,NOT,AND,OR into equivalent
         Fortran              such              as
         .LE.,.GT.,.EQ.,.NOT.,.AND.,.OR.

Some things BASCONV (at least version 1.0) CANNOT do are:

         Convert  Basic  graphics commands such as
         LINE, PSET, PRESET.

         Convert GOSUBS into CALLS

         Convert   PRINT  USING  into  WRITE  with
         FORMAT.

         Handle DATA/RESTORE/READ statements.

         Handle    CHAIN,    LSET,    MKI$,   CVI,
         statements.

         Handle  sceen positioning statements like
         POS(0), CSRLIN.


Here  is  a list of the Basic keywords which ARE NOT converted by
BASCONV:

AUTO     BLOAD   BSAVE   CALL     CHAIN   CIRCLE  CLEAR   CLS
COLOR    COM     COMMON  CONT     CSRLIN  CVD     CVI     DATA
DATE$    DELETE  DRAW    EDIT     ERASE   ERL     ERR     ERROR
FIELD    FILES   FRE     GET      GOSUB   HEX$    INKEY$  INP
INPUT$   INSTR   KEY     KEY$     KILL    LEFT$   LEN     LINE
LIST     LLIST   LOAD    LOC      LOCATE  LOF     LPOS    LSET
MERGE    MID$    MKD$    MKI$     MKS$    MOTOR   NAME    NEW
OCT$     OFF     OPTION  OUT      PAINT   PEEK    PEN     PLAY
POINT    POS     PRESET  PSET     PUT     RANDOMIZE       RENUM
RESTORE  RESUME  RIGHT$  RND      RESET   RUN     SAVE    SCREEN
SOUND    SPACE$  SPC(    STICK    STRIG   STRING$ SYSTEM  TAB(
TIME$    TROFF   TRON    USING    USR     VAL     VARPTR  VARPTR$
WAIT     WIDTH

Finally,  here  is a list of the Basic keywords which ARE handled
by BASCONV:

ABS      AND     ASC     ATN      CDBL    CHR$    CINT    CLOSE
COS      CSNG    DEF     DEFDBL   DEFINT  DEFSNG  DEFSTR  DIM
ELSE     END     EQV     EXP      FIX     FNxxxx  FOR     GOTO
IF       IMP     INPUT   INPUT#   INT     LET     LOG     LPRINT
MOD      NEXT    NOT     ON..GOTO OPEN    OR      PRINT   PRINT#
REM      RETURN  SGN     SIN      SQR     STEP    STOP    STR$
SWAP     TAN     THEN    TO       WEND    WHILE   WRITE   WRITE#
XOR

Although  the  list  of keywords recognized by BASCONV is shorter
than  those not recognized, the most important are there. Many of
the  unrecognized  words  are  those with no Fortran equivalents,
such  as  LINE  or  PAINT.  A  few  are  not  handled  due to the
difficulty    of    programming    the    conversion,   such   as
DATA/READ/RESTORE. Perhaps in Version 1.1...