Annotation of gforth/kernel/cbrpi.fs, revision 1.4
1.1 jwilke 1: \ Structural Conditionals, branches with plugins 10May99jaw
2:
1.4 ! anton 3: \ Copyright (C) 1995-1997,1999,2000 Free Software Foundation, Inc.
1.1 jwilke 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
1.3 anton 19: \ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
1.1 jwilke 20:
21: : ?struc ( flag -- ) abort" unstructured " ;
22: : sys? ( sys -- ) dup 0= ?struc ;
23: : >mark ( -- sys ) here 0 , ;
24: : >resolve ( sys -- ) here over - swap ! ;
25: : <resolve ( sys -- ) here - , ;
26:
27: : BUT sys? swap ; immediate restrict
28: : YET sys? dup ; immediate restrict
29:
30: \ Structural Conditionals 12dec92py
31:
32: : AHEAD branchmark, ; immediate restrict
33: : IF ?branchmark, ; immediate restrict
34: : THEN branchto, branchtoresolve, ; immediate restrict
35: : ELSE sys? compile AHEAD swap compile THEN ;
36: immediate restrict
37:
38: ' THEN Alias ENDIF immediate restrict
39:
40: : BEGIN branchtomark, ; immediate restrict
41: : WHILE sys? compile IF swap ; immediate restrict
42: : AGAIN sys? branch, ; immediate restrict
43: : UNTIL sys? ?branch, ; immediate restrict
44: : REPEAT over 0= ?struc compile AGAIN compile THEN ;
45: immediate restrict
46:
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