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\ Structural Conditionals, based on branches 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.
: ?struc ( flag -- ) abort" unstructured " ;
: sys? ( sys -- ) dup 0= ?struc ;
: >mark ( -- sys ) here 0 , ;
: >resolve ( sys -- ) here over - swap ! ;
: <resolve ( sys -- ) here - , ;
: BUT sys? swap ; immediate restrict
: YET sys? dup ; immediate restrict
\ Structural Conditionals 12dec92py
: AHEAD postpone branch >mark ; immediate restrict
: IF postpone ?branch >mark ; immediate restrict
: THEN sys? dup @ ?struc >resolve ; immediate restrict
: ELSE sys? postpone AHEAD swap postpone THEN ;
immediate restrict
' THEN Alias ENDIF immediate restrict
: BEGIN here ; immediate restrict
: WHILE sys? postpone IF swap ; immediate restrict
: AGAIN sys? postpone branch <resolve ; immediate restrict
: UNTIL sys? postpone ?branch <resolve ; immediate restrict
: REPEAT over 0= ?struc postpone AGAIN postpone THEN ;
immediate restrict
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