Diff for /gforth/kernel/cond-old.fs between versions 1.2 and 1.8

version 1.2, 1998/12/08 22:03:08 version 1.8, 2007/12/31 18:40:26
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 \ Structural Conditionals                              12dec92py  \ Structural Conditionals                              12dec92py
   
 \ Copyright (C) 1995,1996,1997 Free Software Foundation, Inc.  \ Copyright (C) 1995,1996,1997,1999,2000,2003 Free Software Foundation, Inc.
   
 \ This file is part of Gforth.  \ This file is part of Gforth.
   
 \ Gforth is free software; you can redistribute it and/or  \ Gforth is free software; you can redistribute it and/or
 \ modify it under the terms of the GNU General Public License  \ modify it under the terms of the GNU General Public License
 \ as published by the Free Software Foundation; either version 2  \ as published by the Free Software Foundation, either version 3
 \ of the License, or (at your option) any later version.  \ of the License, or (at your option) any later version.
   
 \ This program is distributed in the hope that it will be useful,  \ This program is distributed in the hope that it will be useful,
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 \ GNU General Public License for more details.  \ GNU General Public License for more details.
   
 \ You should have received a copy of the GNU General Public License  \ You should have received a copy of the GNU General Public License
 \ along with this program; if not, write to the Free Software  \ along with this program. If not, see http://www.gnu.org/licenses/.
 \ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  
   
 0 constant defstart  
   
 : ?struc      ( flag -- )       abort" unstructured " ;  
 : sys?        ( sys -- )        dup 0= ?struc ;  
 : >mark       ( -- sys )        here  0 , ;  
 : >resolve    ( sys -- )        here over - swap ! ;  
 : <resolve    ( sys -- )        here - , ;  
   
 : BUT       sys? swap ;                      immediate restrict  
 : YET       sys? dup ;                       immediate restrict  
   
 \ Structural Conditionals                              12dec92py  
   
 : AHEAD     compile branch >mark ;           immediate restrict  
 : IF        compile ?branch >mark ;          immediate restrict  
 : THEN      sys? dup @ ?struc >resolve ;     immediate restrict  
 : ELSE      sys? compile AHEAD swap compile THEN ;  
                                              immediate restrict  
   
 ' THEN Alias ENDIF immediate restrict  
   
 : BEGIN     here ;                           immediate restrict  
 : WHILE     sys? compile IF swap ;           immediate restrict  
 : AGAIN     sys? compile branch  <resolve ;  immediate restrict  
 : UNTIL     sys? compile ?branch <resolve ;  immediate restrict  
 : REPEAT    over 0= ?struc compile AGAIN compile THEN ;  
                                              immediate restrict  
   
 \ Structural Conditionals                              12dec92py  
   
 Variable leavings  
   
 : (leave)   here  leavings @ ,  leavings ! ;  
 : LEAVE     compile branch  (leave) ;  immediate restrict  
 : ?LEAVE    compile 0= compile ?branch  (leave) ;  
                                              immediate restrict  
   
 : DONE   ( addr -- )  leavings @  
   BEGIN  2dup u<=  WHILE  dup @ swap >resolve  REPEAT  
   leavings ! drop ;                          immediate restrict  
   
 \ Structural Conditionals                              12dec92py  
   
 : DO        compile (do)   here ;            immediate restrict  
   
 : ?DO       compile (?do)  (leave) here ;  
                                              immediate restrict  
 : FOR       compile (for)  here ;            immediate restrict  
   
 : loop]     dup <resolve 2 cells - compile done compile unloop ;  
   
 : LOOP      sys? compile (loop)  loop] ;     immediate restrict  
 : +LOOP     sys? compile (+loop) loop] ;     immediate restrict  
 : NEXT      sys? compile (next)  loop] ;     immediate restrict  
   
 : EXIT compile ;s ; immediate restrict  
 : ?EXIT postpone IF postpone EXIT postpone THEN ; immediate restrict  
   
   include ./cbr.fs
   include ./cloop.fs

Removed from v.1.2  
changed lines
  Added in v.1.8


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