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    1: \ Structural Conditionals, loops part                  12dec92py
    2: 
    3: \ Copyright (C) 1995,1996,1997,1999,2001,2003,2006,2007 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 3
   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, see http://www.gnu.org/licenses/.
   19: 
   20: \ Structural Conditionals                              12dec92py
   21: 
   22: \ this works with flash
   23: 
   24: : (leave)   -1 , ;
   25: : LEAVE     postpone branch  (leave) ;  immediate restrict
   26: : ?LEAVE    postpone 0= postpone ?branch  (leave) ;
   27:                                              immediate restrict
   28: 
   29: : DONE   ( addr -- )  here  swap ?DO
   30: 	I @ ['] branch =  I @ ['] ?branch = or  I @ ['] (?do) = or
   31: 	I cell+ @ -1 = and  IF  I cell+ >resolve  THEN
   32:     cell +LOOP ;                             immediate restrict
   33: 
   34: \ Structural Conditionals                              12dec92py
   35: 
   36: : DO        postpone (do)   here ;            immediate restrict
   37: 
   38: : ?DO       postpone (?do)  (leave) here ;
   39:                                              immediate restrict
   40: : FOR       postpone (for)  here ;            immediate restrict
   41: 
   42: : loop]     dup <resolve 2 cells - postpone done postpone unloop ;
   43: 
   44: : LOOP      sys? postpone (loop)  loop] ;     immediate restrict
   45: : +LOOP     sys? postpone (+loop) loop] ;     immediate restrict
   46: : NEXT      sys? postpone (next)  loop] ;     immediate restrict
   47: 
   48: : EXIT postpone ;s ; immediate restrict
   49: : ?EXIT postpone IF postpone EXIT postpone THEN ; immediate restrict
   50: