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 postpone branch (leave) ; immediate restrict
27: : ?LEAVE postpone 0= postpone ?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 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:
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