1: \ Structural Conditionals, branches with plugins 10May99jaw
2:
3: \ Copyright (C) 1995-1997,1999,2000,2003,2007 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
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12: \ This program is distributed in the hope that it will be useful,
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14: \ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15: \ GNU General Public License for more details.
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17: \ You should have received a copy of the GNU General Public License
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19:
20: : ?struc ( flag -- ) abort" unstructured " ;
21: : sys? ( sys -- ) dup 0= ?struc ;
22: : >mark ( -- sys ) here 0 , ;
23: : >resolve ( sys -- ) here over - swap ! ;
24: : <resolve ( sys -- ) here - , ;
25:
26: : BUT sys? swap ; immediate restrict
27: : YET sys? dup ; immediate restrict
28:
29: \ Structural Conditionals 12dec92py
30:
31: : AHEAD branchmark, ; immediate restrict
32: : IF ?branchmark, ; immediate restrict
33: : THEN branchto, branchtoresolve, ; immediate restrict
34: : ELSE sys? compile AHEAD swap compile THEN ;
35: immediate restrict
36:
37: ' THEN Alias ENDIF immediate restrict
38:
39: : BEGIN branchtomark, ; immediate restrict
40: : WHILE sys? compile IF swap ; immediate restrict
41: : AGAIN sys? branch, ; immediate restrict
42: : UNTIL sys? ?branch, ; immediate restrict
43: : REPEAT over 0= ?struc compile AGAIN compile THEN ;
44: immediate restrict
45:
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