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yap-6.3/packages/CLPBN/clpbn/table.yap
2009-10-21 00:05:23 +01:00

322 lines
7.6 KiB
Prolog

/*
Deterministcally table a predicate of the form
K -> RV
where the K are the first N-1 arguments.
Note that this does not include support for backtracking
*/
:- module(clpbn_table,
[clpbn_table/1,
clpbn_tableallargs/1,
clpbn_table_nondet/1,
clpbn_tabled_clause/2,
clpbn_tabled_abolish/1,
clpbn_tabled_asserta/1,
clpbn_tabled_assertz/1,
clpbn_tabled_asserta/2,
clpbn_tabled_assertz/2,
clpbn_tabled_dynamic/1,
clpbn_tabled_number_of_clauses/2,
clpbn_reset_tables/0,
clpbn_reset_tables/1,
clpbn_is_tabled/1
]).
:- use_module(library(bhash),
[b_hash_new/4,
b_hash_lookup/3,
b_hash_insert/4]).
:- meta_predicate clpbn_table(:),
clpbn_tabled_clause(:.?),
clpbn_tabled_abolish(:),
clpbn_tabled_asserta(:),
clpbn_tabled_assertz(:),
clpbn_tabled_asserta(:,-),
clpbn_tabled_assertz(:,-),
clpbn_tabled_number_of_clauses(:,-),
clpbn_is_tabled(:).
:- use_module(library(terms), [
instantiated_term_hash/4,
variant/2
]).
:- dynamic clpbn_table/3.
:- meta_predicate clpbn_table(:), clpbn_table_all_args(:).
:- initialization(init).
init :-
clpbn_reset_tables.
clpbn_reset_tables :-
clpbn_reset_tables(2048).
clpbn_reset_tables(Sz) :-
b_hash_new(Tab, Sz, myf, myc),
nb_setval(clpbn_tables, Tab).
myf(Key, Size, Index) :-
instantiated_term_hash(Key, -1, Size, Index).
myc(A, B) :-
ground(A), !, B == A.
myc(A, B) :-
variant(A,B),
term_variables(A,L1),
term_variables(B,L2),
match_keys(L1,L2).
match_keys([],[]).
match_keys([V1|L1],[V2|L2]) :-
clpbn:get_atts(V1,[key(K)]),
clpbn:get_atts(V2,[key(K)]),
match_keys(L1,L2).
clpbn_table(M:X) :- !,
clpbn_table(X,M).
clpbn_table(X) :-
prolog_load_context(module, M),
clpbn_table(X,M).
clpbn_table(M:X,_) :- !,
clpbn_table(X,M).
clpbn_table((P1,P2),M) :- !,
clpbn_table(P1,M),
clpbn_table(P2,M).
clpbn_table(F/N,M) :-
functor(S,F,N),
S =.. L0,
take_tail(L0, V, L1, V, L2),
Key =.. L1,
atom_concat(F, '___tabled', NF),
L2 = [_|Args],
S1 =.. [NF|Args],
L0 = [_|OArgs],
S2 =.. [NF|OArgs],
asserta(clpbn_table(S, M, S2)),
assert(
(M:S :-
b_getval(clpbn_tables, Tab),
( b_hash_lookup(Key, V1, Tab) ->
V1=V
;
b_hash_insert(Tab, Key, V, NewTab),
b_setval(clpbn_tables,NewTab),
once(M:S2)
)
)
).
take_tail([V], V, [], V1, [V1]) :- !.
take_tail([A|L0], V, [A|L1], V1, [A|L2]) :-
take_tail(L0, V, L1, V1, L2).
clpbn_tableallargs(M:X) :- !,
clpbn_tableallargs(X,M).
clpbn_tableallargs(X) :-
prolog_load_context(module, M),
clpbn_tableallargs(X,M).
clpbn_tableallargs(M:X,_) :- !,
clpbn_tableallargs(X,M).
clpbn_tableallargs((P1,P2),M) :- !,
clpbn_tableallargs(P1,M),
clpbn_tableallargs(P2,M).
clpbn_tableallargs(F/N,M) :-
functor(Key,F,N),
Key =.. [F|Args],
atom_concat(F, '___tabled', NF),
NKey =.. [NF|Args],
asserta(clpbn_table(Key, M, NKey)),
assert(
(M:Key :-
b_getval(clpbn_tables, Tab),
( b_hash_lookup(Key, Out, Tab) ->
true
;
b_hash_insert(Tab, Key, Out, NewTab),
b_setval(clpbn_tables, NewTab),
once(M:NKey)
)
)
).
clpbn_table_nondet(M:X) :- !,
clpbn_table_nondet(X,M).
clpbn_table_nondet(X) :-
prolog_load_context(module, M),
clpbn_table_nondet(X,M).
clpbn_table_nondet(M:X,_) :- !,
clpbn_table_nondet(X,M).
clpbn_table_nondet((P1,P2),M) :- !,
clpbn_table_nondet(P1,M),
clpbn_table_nondet(P2,M).
clpbn_table_nondet(F/N,M) :-
functor(Key,F,N),
Key =.. [F|Args],
atom_concat(F, '___tabled', NF),
NKey =.. [NF|Args],
asserta(clpbn_table(Key, M, NKey)),
assert(
(M:Key :- writeln(in:Key),
b_getval(clpbn_tables, Tab),
( b_hash_lookup(Key, Out, Tab) ->
fail
;
b_hash_insert(Tab, Key, Out, NewTab),
b_setval(clpbn_tables, NewTab),
M:NKey
)
)
).
user:term_expansion((P :- Gs), NC) :-
clpbn_table(P, M, NP),
prolog_load_context(module, M), !,
assert(M:(NP :- Gs)),
NC = (:-true).
in_table(K, V) :-
b_getval(clpbn_tables, Tab),
b_hash_lookup(K, V, Tab).
store_in_table(K, V) :-
b_getval(clpbn_tables, Tab),
b_hash_insert(Tab, K, V).
clpbn_tabled_clause(M:Head, Body) :- !,
clpbn_tabled_clause(Head, M, Body).
clpbn_tabled_clause(Head, Body) :-
prolog_load_context(module, M),
clpbn_tabled_clause(Head, M, Body).
clpbn_tabled_clause(M:Head, _, Body) :- !,
clpbn_tabled_clause(Head, M, Body).
clpbn_tabled_clause(Head, M, Body) :-
clpbn_table(Head, M, THead),
clause(M:THead, Body).
clpbn_tabled_assertz(M:Clause) :- !,
clpbn_tabled_assertz2(Clause, M).
clpbn_tabled_assertz(Clause) :-
prolog_load_context(module, M),
clpbn_tabled_assertz2(Clause, M).
clpbn_tabled_assertz2(M:Clause, _) :- !,
clpbn_tabled_assertz2(Clause, M).
clpbn_tabled_assertz2((Head:-Body), M) :- !,
clpbn_table(Head, M, THead),
assertz(M:(THead :- Body)).
clpbn_tabled_assertz2(Head, M) :-
clpbn_table(Head, M, THead),
assertz(THead).
clpbn_tabled_assertz(M:Clause, Ref) :- !,
clpbn_tabled_assertz2(Clause, M, Ref).
clpbn_tabled_assertz(Clause, Ref) :-
prolog_load_context(module, M),
clpbn_tabled_assertz2(Clause, M, Ref).
clpbn_tabled_assertz2(M:Clause, _, Ref) :- !,
clpbn_tabled_assertz2(Clause, M, Ref).
clpbn_tabled_assertz2((Head:-Body), M, Ref) :- !,
clpbn_table(Head, M, THead),
assertz(M:(THead :- Body), Ref).
clpbn_tabled_assertz2(Head, M, Ref) :-
clpbn_table(Head, M, THead, Ref),
assertz(THead).
clpbn_tabled_asserta(M:Clause) :- !,
clpbn_tabled_asserta2(Clause, M).
clpbn_tabled_asserta(Clause) :-
prolog_load_context(module, M),
clpbn_tabled_asserta2(Clause, M).
clpbn_tabled_asserta2(M:Clause, _) :- !,
clpbn_tabled_asserta2(Clause, M).
clpbn_tabled_asserta2((Head:-Body), M) :- !,
clpbn_table(Head, M, THead),
asserta(M:(THead :- Body)).
clpbn_tabled_asserta2(Head, M) :-
clpbn_table(Head, M, THead),
asserta(THead).
clpbn_tabled_asserta(M:Clause, Ref) :- !,
clpbn_tabled_asserta2(Clause, M, Ref).
clpbn_tabled_asserta(Clause, Ref) :-
prolog_load_context(module, M),
clpbn_tabled_asserta2(Clause, M, Ref).
clpbn_tabled_asserta2(M:Clause, _, Ref) :- !,
clpbn_tabled_asserta2(Clause, M, Ref).
clpbn_tabled_asserta2((Head:-Body), M, Ref) :- !,
clpbn_table(Head, M, THead),
asserta(M:(THead :- Body), Ref).
clpbn_tabled_asserta2(Head, M, Ref) :-
clpbn_table(Head, M, THead, Ref),
asserta(THead).
clpbn_tabled_abolish(M:Clause) :- !,
clpbn_tabled_abolish(Clause, M).
clpbn_tabled_abolish(Clause) :-
prolog_load_context(module, M),
clpbn_tabled_abolish(Clause, M).
clpbn_tabled_abolish(M:Clause, _) :- !,
clpbn_tabled_abolish(Clause, M).
clpbn_tabled_abolish(N/A, M) :-
functor(Head, N, A),
clpbn_table(Head, M, THead),
functor(THead, TN, A),
abolish(M:TN/A).
clpbn_tabled_dynamic(M:Clause) :- !,
clpbn_tabled_dynamic(Clause, M).
clpbn_tabled_dynamic(Clause) :-
prolog_load_context(module, M),
clpbn_tabled_dynamic(Clause, M).
clpbn_tabled_dynamic(M:Clause, _) :- !,
clpbn_tabled_dynamic(Clause, M).
clpbn_tabled_dynamic(N/A, M) :-
functor(Head, N, A),
clpbn_table(Head, M, THead),
functor(THead, TN, A),
dynamic(M:TN/A).
clpbn_tabled_number_of_clauses(M:Clause, N) :- !,
clpbn_tabled_number_of_clauses(Clause, M, N).
clpbn_tabled_number_of_clauses(Clause, N) :-
prolog_load_context(module, M),
clpbn_tabled_number_of_clauses(Clause, M, N).
clpbn_tabled_number_of_clauses(M:Clause, _, N) :- !,
clpbn_tabled_number_of_clauses(Clause, M, N).
clpbn_tabled_number_of_clauses(Head, M, N) :-
clpbn_table(Head, M, THead),
predicate_property(M:THead,number_of_clauses(N)).
clpbn_is_tabled(M:Clause) :- !,
clpbn_is_tabled(Clause, M).
clpbn_is_tabled(Clause) :-
prolog_load_context(module, M),
clpbn_is_tabled(Clause, M).
clpbn_is_tabled(M:Clause, _) :- !,
clpbn_is_tabled(Clause, M).
clpbn_is_tabled(Head, M) :-
clpbn_table(Head, M, _).