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Annotation of gforth/kernel/cbrpi.fs, revision 1.1

1.1     ! jwilke      1: \ Structural Conditionals, branches with plugins               10May99jaw
        !             2: 
        !             3: \ Copyright (C) 1995-1997 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., 675 Mass Ave, Cambridge, MA 02139, USA.
        !            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: