BSD 3 development

[unix-history] / usr / src / cmd / f77 / gram.io

 /*  Input/Output Statements */

io:       io1
               { endio(); }
       ;

io1:      iofmove ioctl
       | iofmove unpar_fexpr
               { ioclause(IOSUNIT, $2); endioctl(); }
       | iofctl ioctl
       | read ioctl
               { doio(NULL); }
       | read infmt
               { doio(NULL); }
       | read ioctl inlist
               { doio($3); }
       | read infmt SCOMMA inlist
               { doio($4); }
       | read ioctl SCOMMA inlist
               { doio($4); }
       | write ioctl
               { doio(NULL); }
       | write ioctl outlist
               { doio($3); }
       | print
               { doio(NULL); }
       | print SCOMMA outlist
               { doio($3); }
       ;

iofmove:   fmkwd end_spec in_ioctl
       ;

fmkwd:    SBACKSPACE
               { iostmt = IOBACKSPACE; }
       | SREWIND
               { iostmt = IOREWIND; }
       | SENDFILE
               { iostmt = IOENDFILE; }
       ;

iofctl:  ctlkwd end_spec in_ioctl
       ;

ctlkwd:   SINQUIRE
               { iostmt = IOINQUIRE; }
       | SOPEN
               { iostmt = IOOPEN; }
       | SCLOSE
               { iostmt = IOCLOSE; }
       ;

infmt:    unpar_fexpr
               {
               ioclause(IOSUNIT, NULL);
               ioclause(IOSFMT, $1);
               endioctl();
               }
       | SSTAR
               {
               ioclause(IOSUNIT, NULL);
               ioclause(IOSFMT, NULL);
               endioctl();
               }
       ;

ioctl:    SLPAR fexpr SRPAR
               { if($2->vtype == TYCHAR)
                       {
                       ioclause(IOSUNIT, NULL);
                       ioclause(IOSFMT, $2);
                       }
                 else
                       ioclause(IOSUNIT, $2);
                 endioctl();
               }
       | SLPAR ctllist SRPAR
               { endioctl(); }
       ;

ctllist:  ioclause
       | ctllist SCOMMA ioclause
       ;

ioclause:  fexpr
               { ioclause(IOSPOSITIONAL, $1); }
       | SSTAR
               { ioclause(IOSPOSITIONAL, NULL); }
       | nameeq expr
               { ioclause($1, $2); }
       | nameeq SSTAR
               { ioclause($1, NULL); }
       ;

nameeq:  SNAMEEQ
               { $$ = iocname(); }
       ;

read:     SREAD end_spec in_ioctl
               { iostmt = IOREAD; }
       ;

write:    SWRITE end_spec in_ioctl
               { iostmt = IOWRITE; }
       ;

print:    SPRINT end_spec fexpr in_ioctl
               {
               iostmt = IOWRITE;
               ioclause(IOSUNIT, NULL);
               ioclause(IOSFMT, $3);
               endioctl();
               }
       | SPRINT end_spec SSTAR in_ioctl
               {
               iostmt = IOWRITE;
               ioclause(IOSUNIT, NULL);
               ioclause(IOSFMT, NULL);
               endioctl();
               }
       ;

inlist:   inelt
               { $$ = mkchain($1,0); }
       | inlist SCOMMA inelt
               { $$ = hookup($1, mkchain($3,0)); }
       ;

inelt:    lhs
       | SLPAR inlist SCOMMA dospec SRPAR
               { $$ = mkiodo($4,$2); }
       ;

outlist:  uexpr
               { $$ = mkchain($1, 0); }
       | other
               { $$ = mkchain($1, 0); }
       | out2
       ;

out2:     uexpr SCOMMA uexpr
               { $$ = mkchain($1, mkchain($3, 0) ); }
       | uexpr SCOMMA other
               { $$ = mkchain($1, mkchain($3, 0) ); }
       | other SCOMMA uexpr
               { $$ = mkchain($1, mkchain($3, 0) ); }
       | other SCOMMA other
               { $$ = mkchain($1, mkchain($3, 0) ); }
       | out2  SCOMMA uexpr
               { $$ = hookup($1, mkchain($3, 0) ); }
       | out2  SCOMMA other
               { $$ = hookup($1, mkchain($3, 0) ); }
       ;

other:    complex_const
       | SLPAR uexpr SCOMMA dospec SRPAR
               { $$ = mkiodo($4, mkchain($2, 0) ); }
       | SLPAR other SCOMMA dospec SRPAR
               { $$ = mkiodo($4, mkchain($2, 0) ); }
       | SLPAR out2  SCOMMA dospec SRPAR
               { $$ = mkiodo($4, $2); }
       ;

in_ioctl:
               { startioctl(); }
       ;