/* File:      flraggmax.P
**
** Author(s): Guizhen Yang 
**
** Contact:   flora-users@lists.sourceforge.net
**
** Copyright (C) The Research Foundation of SUNY, 1999-2001
**
** FLORA-2 is free software; you can redistribute it and/or modify it under the
** terms of the GNU Library General Public License as published by the Free
** Software Foundation; either version 2 of the License, or (at your option)
** any later version.
** 
** FLORA-2 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 Library General Public License for
** more details.
** 
** You should have received a copy of the GNU Library General Public License
** along with FLORA-2; if not, write to the Free Software Foundation,
** Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
** 
** $Id: flraggmax.P,v 1.8 2003/06/18 07:01:21 kifer Exp $
** 
*/


:- compiler_options([xpp_on]).

#include "flora_terms.flh"

:- import ground/1, member/2 from basics.



/*********************************************************************
  fllibmax(+Var,+VarList,+Goal,-Max)
*********************************************************************/
fllibmax(Var,[],Goal,Max) :-
	!,
	findall(Var,Goal,Matches),
	Matches=[H|L],
	flora_maxaux(L,H,Max).

fllibmax(Var,VarList,Goal,Max) :-
	ground(VarList),
	!,
	findall(Var,Goal,Matches),
	Matches=[H|L],
	flora_maxaux(L,H,Max).

fllibmax(Var,VarList,Goal,Max) :-
	!,
	findall(flora_result(Var,VarList),Goal,Matches),
	findall(Grp,member(flora_result(_,Grp),Matches),GL),
	sort(GL,Groups),
	member(VarList,Groups),
	findall(D,member(flora_result(D,VarList),Matches),DL),
	DL=[H|L],
	flora_maxaux(L,H,Max).


/********************************************************************
  flora_maxaux(+List,+CurrMax,-Max)
********************************************************************/
flora_maxaux([],X,X) :- !.

flora_maxaux([H|L],X,Max) :-
	!,
	( H @> X ->
	    flora_maxaux(L,H,Max)
	;
	  flora_maxaux(L,X,Max)
	).