File:  [gforth] / gforth / kernel / cbrpi.fs
Revision 1.3: download - view: text, annotated - select for diffs
Sat Sep 23 15:47:09 2000 UTC (20 years, 10 months ago) by anton
Branches: MAIN
CVS tags: v0-5-0, HEAD
changed FSF address in copyright messages

    1: \ Structural Conditionals, branches with plugins		10May99jaw
    2: 
    3: \ Copyright (C) 1995-1997,1999 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: : ?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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