File:  [gforth] / gforth / kernel / cloop.fs
Revision 1.3: download - view: text, annotated - select for diffs
Sat Sep 23 15:47:09 2000 UTC (20 years, 10 months ago) by anton
Branches: MAIN
CVS tags: v0-5-0, HEAD
changed FSF address in copyright messages

    1: \ Structural Conditionals, loops part                  12dec92py
    2: 
    3: \ Copyright (C) 1995,1996,1997,1999 Free Software Foundation, Inc.
    4: 
    5: \ This file is part of Gforth.
    6: 
    7: \ Gforth is free software; you can redistribute it and/or
    8: \ modify it under the terms of the GNU General Public License
    9: \ as published by the Free Software Foundation; either version 2
   10: \ of the License, or (at your option) any later version.
   11: 
   12: \ This program is distributed in the hope that it will be useful,
   13: \ but WITHOUT ANY WARRANTY; without even the implied warranty of
   14: \ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   15: \ GNU General Public License for more details.
   16: 
   17: \ You should have received a copy of the GNU General Public License
   18: \ along with this program; if not, write to the Free Software
   19: \ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
   20: 
   21: \ Structural Conditionals                              12dec92py
   22: 
   23: Variable leavings
   24: 
   25: : (leave)   here  leavings @ ,  leavings ! ;
   26: : LEAVE     compile branch  (leave) ;  immediate restrict
   27: : ?LEAVE    compile 0= compile ?branch  (leave) ;
   28:                                              immediate restrict
   29: 
   30: : DONE   ( addr -- )  leavings @
   31:   BEGIN  2dup u<=  WHILE  dup @ swap >resolve  REPEAT
   32:   leavings ! drop ;                          immediate restrict
   33: 
   34: \ Structural Conditionals                              12dec92py
   35: 
   36: : DO        compile (do)   here ;            immediate restrict
   37: 
   38: : ?DO       compile (?do)  (leave) here ;
   39:                                              immediate restrict
   40: : FOR       compile (for)  here ;            immediate restrict
   41: 
   42: : loop]     dup <resolve 2 cells - compile done compile unloop ;
   43: 
   44: : LOOP      sys? compile (loop)  loop] ;     immediate restrict
   45: : +LOOP     sys? compile (+loop) loop] ;     immediate restrict
   46: : NEXT      sys? compile (next)  loop] ;     immediate restrict
   47: 
   48: : EXIT compile ;s ; immediate restrict
   49: : ?EXIT postpone IF postpone EXIT postpone THEN ; immediate restrict
   50: 

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