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\ Structural Conditionals, loops part 12dec92py
\ Copyright (C) 1995,1996,1997,1999,2001,2003 Free Software Foundation, Inc.
\ This file is part of Gforth.
\ Gforth is free software; you can redistribute it and/or
\ modify it under the terms of the GNU General Public License
\ as published by the Free Software Foundation; either version 2
\ of the License, or (at your option) any later version.
\ This program is distributed in the hope that it will be useful,
\ but WITHOUT ANY WARRANTY; without even the implied warranty of
\ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
\ GNU General Public License for more details.
\ You should have received a copy of the GNU General Public License
\ along with this program; if not, write to the Free Software
\ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
\ Structural Conditionals 12dec92py
Variable leavings
: (leave) here leavings @ , leavings ! ;
: LEAVE postpone branch (leave) ; immediate restrict
: ?LEAVE postpone 0= postpone ?branch (leave) ;
immediate restrict
: DONE ( addr -- ) leavings @
BEGIN 2dup u<= WHILE dup @ swap >resolve REPEAT
leavings ! drop ; immediate restrict
\ Structural Conditionals 12dec92py
: DO postpone (do) here ; immediate restrict
: ?DO postpone (?do) (leave) here ;
immediate restrict
: FOR postpone (for) here ; immediate restrict
: loop] dup <resolve 2 cells - postpone done postpone unloop ;
: LOOP sys? postpone (loop) loop] ; immediate restrict
: +LOOP sys? postpone (+loop) loop] ; immediate restrict
: NEXT sys? postpone (next) loop] ; immediate restrict
: EXIT postpone ;s ; immediate restrict
: ?EXIT postpone IF postpone EXIT postpone THEN ; immediate restrict
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