File:  [gforth] / gforth / kernel / cbrpi.fs
Revision 1.7: download - view: text, annotated - select for diffs
Mon Dec 31 19:02:25 2007 UTC (16 years, 3 months ago) by anton
Branches: MAIN
CVS tags: v0-7-0, HEAD
updated copyright year after changing license notice

    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
    9: \ as published by the Free Software Foundation, either version 3
   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, see http://www.gnu.org/licenses/.
   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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