2010-11-03 00:33:26 +00:00
|
|
|
|
|
|
|
|
:- module(meld_topdown,
|
|
|
|
|
[
|
|
|
|
|
meld_top_down_compile/2,
|
|
|
|
|
meld_top_down_aggregate/3
|
|
|
|
|
]).
|
|
|
|
|
|
|
|
|
|
:- use_module(meldi,
|
|
|
|
|
[
|
|
|
|
|
maxval/3,
|
|
|
|
|
minval/3
|
|
|
|
|
]).
|
|
|
|
|
|
2014-08-06 16:26:03 +01:00
|
|
|
:- use_module(meld).
|
|
|
|
|
|
2010-11-03 00:33:26 +00:00
|
|
|
:- dynamic extensional/3, translate/2.
|
|
|
|
|
|
|
|
|
|
meld_top_down_aggregate(S0, horn, _) :-
|
|
|
|
|
functor(S0,Na,Arg),
|
|
|
|
|
table(Na/Arg).
|
|
|
|
|
meld_top_down_aggregate(S0, max, Arg) :-
|
|
|
|
|
functor(S0, Na, Arg),
|
|
|
|
|
functor(S, Na, Arg),
|
|
|
|
|
table(Na/Arg),
|
|
|
|
|
meld_compiler:freshen(S, Arg, VHead),
|
|
|
|
|
VHead =.. [Na|Args],
|
|
|
|
|
atom_concat([Na,'__max'], NewName),
|
|
|
|
|
NVHead =.. [NewName|Args],
|
|
|
|
|
arg(Arg, NVHead, A),
|
|
|
|
|
arg(Arg, S, MAX),
|
|
|
|
|
assert_static((S :- maxval(A, NVHead, MAX))),
|
|
|
|
|
assert(translate(Na,NewName)).
|
|
|
|
|
meld_top_down_aggregate(S0, min, Arg) :-
|
|
|
|
|
functor(S0, Na, Arg),
|
|
|
|
|
functor(S, Na, Arg),
|
|
|
|
|
table(Na/Arg),
|
|
|
|
|
meld_compiler:freshen(S, Arg, VHead),
|
|
|
|
|
VHead =.. [Na|Args],
|
|
|
|
|
atom_concat([Na,'__max'], NewName),
|
|
|
|
|
NVHead =.. [NewName|Args],
|
|
|
|
|
arg(Arg, NVHead, A),
|
|
|
|
|
arg(Arg, S, MIN),
|
|
|
|
|
assert_static((S :- minval(A, NVHead, MIN))),
|
|
|
|
|
assert(translate(Na,NewName)).
|
|
|
|
|
meld_top_down_aggregate(S0, first, _) :-
|
|
|
|
|
functor(S0, Na, Arg),
|
|
|
|
|
functor(S, Na, Arg),
|
|
|
|
|
table(Na/Arg),
|
|
|
|
|
S =.. [Na|Args],
|
|
|
|
|
atom_concat([Na,'__max'], NewName),
|
|
|
|
|
NS =.. [NewName|Args],
|
|
|
|
|
assert_static((S :- once(NS))),
|
|
|
|
|
assert(translate(Na,NewName)).
|
|
|
|
|
|
|
|
|
|
meld_top_down_compile(Head, Body) :-
|
|
|
|
|
compile_body(Body, NBody),
|
|
|
|
|
compile_aggregate(Head, NHead),
|
|
|
|
|
assert_static((NHead :- NBody)).
|
|
|
|
|
|
|
|
|
|
compile_body((G1,G2), (NG1, NG2)) :- !,
|
|
|
|
|
compile_body(G1, NG1),
|
|
|
|
|
compile_body(G2, NG2).
|
|
|
|
|
compile_body((forall G then B), (forall NG then NB)) :- !,
|
|
|
|
|
compile_body(G, NG),
|
|
|
|
|
compile_body(B, NB).
|
|
|
|
|
compile_body(G, meld_program:G) :-
|
|
|
|
|
extensional(G,_,_), !.
|
|
|
|
|
compile_body(G, G).
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
compile_aggregate(Head, NewHead) :-
|
|
|
|
|
Head =.. [Na|Args],
|
|
|
|
|
translate(Na, NewNa), !,
|
|
|
|
|
NewHead =.. [NewNa|Args].
|
|
|
|
|
compile_aggregate(Head, Head).
|
|
|
|
|
|
|
|
|
|
|
