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Reimplemented [IF] [ELSE] [THEN] etc.
Corrected a bug concerning redefinitions in Kernal
Added config info for HP-PA
Added replacement for rint

    1: \ Interpretative Structuren                            16feb92py
    2: 
    3: Variable countif
    4: 
    5: : dummy ;  immediate
    6: : >exec  >r ; restrict ( :-)
    7: : scanIF   f83find  dup 0=  IF  drop ['] dummy >name  THEN  ;
    8: 
    9: Create [struct]-search    ' scanIF A,  ' (reveal) A,  ' drop A,
   10: Create [struct]-voc       NIL A,       G [struct]-search T A,
   11:                           NIL A,       NIL A,
   12: 
   13: : ?if  countif @ 0<
   14:   IF  [ [struct]-voc 3 cells + ] ALiteral @ lookup !  THEN ;
   15: 
   16: UNLOCK Tlast @ NIL Tlast ! LOCK
   17: 
   18: : [IF]      1 countif +! ?if ;       immediate
   19: : [THEN]   -1 countif +! ?if ;       immediate
   20: : [ELSE]   postpone [THEN] r> >exec postpone [IF] ;
   21:                                      immediate
   22: ' [IF]   Alias [IFDEF]               immediate
   23: ' [IF]   Alias [IFUNDEF]             immediate
   24: ' [IF]   Alias [BEGIN]               immediate
   25: ' [IF]   Alias [WHILE]               immediate
   26: ' [THEN] Alias [UNTIL]               immediate
   27: ' [THEN] Alias [AGAIN]               immediate
   28: ' [IF]   Alias [DO]                  immediate
   29: ' [IF]   Alias [?DO]                 immediate
   30: ' [THEN] Alias [LOOP]                immediate
   31: ' [THEN] Alias [+LOOP]               immediate
   32: : [REPEAT]  postpone [AGAIN] postpone [THEN] ;
   33:                                      immediate
   34: ' ( Alias (                          immediate
   35: ' \ Alias \                          immediate
   36: 
   37: UNLOCK Tlast @ swap Tlast ! LOCK
   38: 1 cells - G [struct]-voc T !
   39: 
   40: \ Interpretative Structuren                            30apr92py
   41: 
   42: : defined   bl word find nip 0<> ; immediate
   43: : [IF] 0= IF  countif off
   44:               lookup @ [ [struct]-voc 3 cells + ] ALiteral !
   45: 	      [struct]-voc lookup !
   46:           THEN ;                                      immediate
   47: : [IFDEF]   postpone defined    postpone [IF] ;       immediate
   48: : [IFUNDEF] postpone defined 0= postpone [IF] ;       immediate
   49: : [ELSE] 0 postpone [IF] ;                            immediate
   50: : [THEN] ;                                            immediate
   51: 
   52: \ Structs for interpreter                              28nov92py
   53: 
   54: User (i)
   55: 
   56: : [DO]  ( start end -- )  >in @ -rot
   57:   DO   I (i) ! dup >r >in ! interpret r> swap +LOOP  drop ;
   58:                                                       immediate
   59: : [?DO] 2dup = IF 2drop postpone [ELSE] ELSE postpone [DO] THEN ;
   60:                                                       immediate
   61: : [+LOOP] ( n -- ) rdrop rdrop ;                      immediate
   62: : [LOOP] ( -- ) 1 rdrop rdrop ;                       immediate
   63: : [FOR] ( n -- )  0 swap postpone [DO] ;              immediate
   64: : [NEXT] ( n -- ) -1 rdrop rdrop ;                    immediate
   65: : [I] ( -- index ) (I) @ postpone Literal ;           immediate
   66: : [BEGIN] >in @ >r BEGIN r@ >in ! interpret UNTIL rdrop ;
   67:                                                       immediate
   68: ' [+LOOP]  Alias [UNTIL] immediate
   69: : [REPEAT]  ( -- )  false rdrop rdrop ;               immediate
   70: ' [REPEAT] Alias [AGAIN] immediate
   71: : [WHILE]   ( flag -- )
   72:   0= IF   postpone [ELSE] true rdrop rdrop 1 countif +!  THEN ;
   73:                                                       immediate
   74: