Annotation of gforth/kernel/cbrpi.fs, revision 1.7

1.1       jwilke      1: \ Structural Conditionals, branches with plugins               10May99jaw
                      2: 
1.7     ! anton       3: \ Copyright (C) 1995-1997,1999,2000,2003,2007 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
1.6       anton       9: \ as published by the Free Software Foundation, either version 3
1.1       jwilke     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
1.6       anton      18: \ along with this program. If not, see http://www.gnu.org/licenses/.
1.1       jwilke     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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