361 lines
8.8 KiB
Prolog
361 lines
8.8 KiB
Prolog
/*
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Deterministcally table a predicate of the form
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K -> RV
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where the K are the first N-1 arguments.
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Note that this does not include support for backtracking
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*/
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:- module(clpbn_table,
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[clpbn_table/1,
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clpbn_tableallargs/1,
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clpbn_table_nondet/1,
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clpbn_tabled_clause/2,
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clpbn_tabled_clause_ref/3,
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clpbn_tabled_retract/2,
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clpbn_tabled_abolish/1,
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clpbn_tabled_asserta/1,
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clpbn_tabled_assertz/1,
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clpbn_tabled_asserta/2,
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clpbn_tabled_assertz/2,
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clpbn_tabled_dynamic/1,
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clpbn_tabled_number_of_clauses/2,
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clpbn_reset_tables/0,
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clpbn_reset_tables/1,
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clpbn_is_tabled/1
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]).
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:- use_module(library(bhash),
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[b_hash_new/4,
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b_hash_lookup/3,
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b_hash_insert/4
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]).
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:- meta_predicate clpbn_table(:),
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clpbn_tabled_clause(:.?),
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clpbn_tabled_clause_ref(:.?,?),
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clpbn_tabled_retract(:),
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clpbn_tabled_abolish(:),
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clpbn_tabled_asserta(:),
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clpbn_tabled_assertz(:),
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clpbn_tabled_asserta(:,-),
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clpbn_tabled_assertz(:,-),
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clpbn_tabled_number_of_clauses(:,-),
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clpbn_is_tabled(:).
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:- use_module(library(terms),
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[instantiated_term_hash/4,
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variant/2
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]).
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:- use_module(evidence,
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[put_evidence/2]).
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:- dynamic clpbn_table/3.
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:- meta_predicate clpbn_table(:), clpbn_table_all_args(:).
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:- initialization(init).
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init :-
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clpbn_reset_tables.
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clpbn_reset_tables :-
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clpbn_reset_tables(2048).
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clpbn_reset_tables(Sz) :-
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b_hash_new(Tab, Sz, myf, myc),
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nb_setval(clpbn_tables, Tab).
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myf(Key, Size, Index) :-
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instantiated_term_hash(Key, -1, Size, Index).
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myc(A, B) :-
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ground(A), !, B == A.
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myc(A, B) :-
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variant(A,B),
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term_variables(A,L1),
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term_variables(B,L2),
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match_keys(L1,L2).
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match_keys([],[]).
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match_keys([V1|L1],[V2|L2]) :-
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clpbn:get_atts(V1,[key(K)]),
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clpbn:get_atts(V2,[key(K)]),
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match_keys(L1,L2).
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clpbn_table(M:X) :- !,
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clpbn_table(X,M).
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clpbn_table(X) :-
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prolog_load_context(module, M),
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clpbn_table(X,M).
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clpbn_table(M:X,_) :- !,
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clpbn_table(X,M).
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clpbn_table((P1,P2),M) :- !,
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clpbn_table(P1,M),
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clpbn_table(P2,M).
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clpbn_table(F/N,M) :-
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functor(S,F,N),
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S =.. L0,
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take_tail(L0, A0, L1, V2, L2),
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Key =.. L1,
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atom_concat(F, '___tabled', NF),
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L2 = [_|Args2],
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Goal =.. [NF|Args2],
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L0 = [_|Args0],
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IGoal =.. [NF|Args0],
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asserta(clpbn_table(S, M, IGoal)),
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assert((M:S :-
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!,
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b_getval((clpbn_tables), Tab),
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% V2 is unbound.
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(b_hash_lookup(Key, V2, Tab) ->
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% (attvar(V2) -> writeln(ok:A0:V2) ; writeln(error(V2:should_be_attvar(S)))),
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(var(A0) -> A0 = V2 ; put_evidence(A0, V2))
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;
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% writeln(new),
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b_hash_insert(Tab, Key, V2, NewTab),
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b_setval(clpbn_tables,NewTab),
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once(M:Goal), !,
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% enter evidence after binding.
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(var(A0) -> A0 = V2 ; put_evidence(A0, V2))
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;
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clpbn:clpbn_flag(solver,none) ->
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true
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;
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throw(error(tabled_clpbn_predicate_should_never_fail,S))
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)
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)).
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take_tail([V], V, [], V1, [V1]) :- !.
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take_tail([A|L0], V, [A|L1], V1, [A|L2]) :-
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take_tail(L0, V, L1, V1, L2).
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clpbn_tableallargs(M:X) :- !,
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clpbn_tableallargs(X,M).
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clpbn_tableallargs(X) :-
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prolog_load_context(module, M),
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clpbn_tableallargs(X,M).
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clpbn_tableallargs(M:X,_) :- !,
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clpbn_tableallargs(X,M).
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clpbn_tableallargs((P1,P2),M) :- !,
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clpbn_tableallargs(P1,M),
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clpbn_tableallargs(P2,M).
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clpbn_tableallargs(F/N,M) :-
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functor(Key,F,N),
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Key =.. [F|Args],
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atom_concat(F, '___tabled', NF),
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NKey =.. [NF|Args],
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asserta(clpbn_table(Key, M, NKey)),
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assert((M:Key :-
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!,
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b_getval(clpbn_tables, Tab),
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(b_hash_lookup(Key, Out, Tab) ->
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true
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;
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b_hash_insert(Tab, Key, Out, NewTab),
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b_setval(clpbn_tables, NewTab),
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once(M:NKey)
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)
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)).
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clpbn_table_nondet(M:X) :- !,
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clpbn_table_nondet(X,M).
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clpbn_table_nondet(X) :-
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prolog_load_context(module, M),
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clpbn_table_nondet(X,M).
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clpbn_table_nondet(M:X,_) :- !,
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clpbn_table_nondet(X,M).
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clpbn_table_nondet((P1,P2),M) :- !,
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clpbn_table_nondet(P1,M),
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clpbn_table_nondet(P2,M).
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clpbn_table_nondet(F/N,M) :-
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functor(Key,F,N),
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Key =.. [F|Args],
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atom_concat(F, '___tabled', NF),
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NKey =.. [NF|Args],
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asserta(clpbn_table(Key, M, NKey)),
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assert((M:Key :-
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% writeln(in:Key),
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b_getval(clpbn_tables, Tab),
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(b_hash_lookup(Key, Out, Tab) ->
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fail
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;
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b_hash_insert(Tab, Key, Out, NewTab),
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b_setval(clpbn_tables, NewTab),
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M:NKey
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)
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)).
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user:term_expansion((P :- Gs), NC) :-
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clpbn_table(P, M, NP),
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prolog_load_context(module, M), !,
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assert(M:(NP :- Gs)),
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NC = (:-true).
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in_table(K, V) :-
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b_getval(clpbn_tables, Tab),
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b_hash_lookup(K, V, Tab).
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store_in_table(K, V) :-
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b_getval(clpbn_tables, Tab),
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b_hash_insert(Tab, K, V).
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clpbn_tabled_clause(M:Head, Body) :- !,
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clpbn_tabled_clause(Head, M, Body).
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clpbn_tabled_clause(Head, Body) :-
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prolog_load_context(module, M),
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clpbn_tabled_clause(Head, M, Body).
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clpbn_tabled_clause(M:Head, _, Body) :- !,
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clpbn_tabled_clause(Head, M, Body).
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clpbn_tabled_clause(Head, M, Body) :-
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clpbn_table(Head, M, THead),
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clause(M:THead, Body).
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clpbn_tabled_clause_ref(M:Head, Body, Ref) :- !,
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clpbn_tabled_clause_ref(Head, M, Body, Ref).
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clpbn_tabled_clause_ref(Head, Body, Ref) :-
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prolog_load_context(module, M),
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clpbn_tabled_clause_ref(Head, M, Body, Ref).
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clpbn_tabled_clause_ref(M:Head, _, Body, Ref) :- !,
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clpbn_tabled_clause_ref(Head, M, Body, Ref).
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clpbn_tabled_clause_ref(Head, M, Body, Ref) :-
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clpbn_table(Head, M, THead),
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clause(M:THead, Body, Ref).
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clpbn_tabled_retract(M:Head) :- !,
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clpbn_tabled_retract(Head, M).
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clpbn_tabled_retract(Head) :-
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prolog_load_context(module, M),
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clpbn_tabled_retract(Head, M).
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clpbn_tabled_retract(M:Head, _) :- !,
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clpbn_tabled_retract(Head, M).
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clpbn_tabled_retract(Head, M) :-
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clpbn_table(Head, M, THead),
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retract(M:THead).
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clpbn_tabled_assertz(M:Clause) :- !,
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clpbn_tabled_assertz2(Clause, M).
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clpbn_tabled_assertz(Clause) :-
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prolog_load_context(module, M),
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clpbn_tabled_assertz2(Clause, M).
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clpbn_tabled_assertz2(M:Clause, _) :- !,
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clpbn_tabled_assertz2(Clause, M).
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clpbn_tabled_assertz2((Head:-Body), M) :- !,
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clpbn_table(Head, M, THead),
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assertz(M:(THead :- Body)).
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clpbn_tabled_assertz2(Head, M) :-
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clpbn_table(Head, M, THead),
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assertz(THead).
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clpbn_tabled_assertz(M:Clause, Ref) :- !,
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clpbn_tabled_assertz2(Clause, M, Ref).
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clpbn_tabled_assertz(Clause, Ref) :-
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prolog_load_context(module, M),
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clpbn_tabled_assertz2(Clause, M, Ref).
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clpbn_tabled_assertz2(M:Clause, _, Ref) :- !,
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clpbn_tabled_assertz2(Clause, M, Ref).
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clpbn_tabled_assertz2((Head:-Body), M, Ref) :- !,
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clpbn_table(Head, M, THead),
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assertz(M:(THead :- Body), Ref).
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clpbn_tabled_assertz2(Head, M, Ref) :-
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clpbn_table(Head, M, THead, Ref),
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assertz(THead).
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clpbn_tabled_asserta(M:Clause) :- !,
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clpbn_tabled_asserta2(Clause, M).
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clpbn_tabled_asserta(Clause) :-
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prolog_load_context(module, M),
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clpbn_tabled_asserta2(Clause, M).
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clpbn_tabled_asserta2(M:Clause, _) :- !,
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clpbn_tabled_asserta2(Clause, M).
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clpbn_tabled_asserta2((Head:-Body), M) :- !,
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clpbn_table(Head, M, THead),
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asserta(M:(THead :- Body)).
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clpbn_tabled_asserta2(Head, M) :-
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clpbn_table(Head, M, THead),
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asserta(THead).
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clpbn_tabled_asserta(M:Clause, Ref) :- !,
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clpbn_tabled_asserta2(Clause, M, Ref).
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clpbn_tabled_asserta(Clause, Ref) :-
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prolog_load_context(module, M),
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clpbn_tabled_asserta2(Clause, M, Ref).
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clpbn_tabled_asserta2(M:Clause, _, Ref) :- !,
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clpbn_tabled_asserta2(Clause, M, Ref).
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clpbn_tabled_asserta2((Head:-Body), M, Ref) :- !,
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clpbn_table(Head, M, THead),
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asserta(M:(THead :- Body), Ref).
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clpbn_tabled_asserta2(Head, M, Ref) :-
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clpbn_table(Head, M, THead, Ref),
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asserta(THead).
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clpbn_tabled_abolish(M:Clause) :- !,
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clpbn_tabled_abolish(Clause, M).
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clpbn_tabled_abolish(Clause) :-
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prolog_load_context(module, M),
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clpbn_tabled_abolish(Clause, M).
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clpbn_tabled_abolish(M:Clause, _) :- !,
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clpbn_tabled_abolish(Clause, M).
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clpbn_tabled_abolish(N/A, M) :-
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functor(Head, N, A),
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clpbn_table(Head, M, THead),
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functor(THead, TN, A),
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abolish(M:TN/A).
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clpbn_tabled_dynamic(M:Clause) :- !,
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clpbn_tabled_dynamic(Clause, M).
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clpbn_tabled_dynamic(Clause) :-
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prolog_load_context(module, M),
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clpbn_tabled_dynamic(Clause, M).
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clpbn_tabled_dynamic(M:Clause, _) :- !,
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clpbn_tabled_dynamic(Clause, M).
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clpbn_tabled_dynamic(N/A, M) :-
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functor(Head, N, A),
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clpbn_table(Head, M, THead),
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functor(THead, TN, A),
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dynamic(M:TN/A).
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clpbn_tabled_number_of_clauses(M:Clause, N) :- !,
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clpbn_tabled_number_of_clauses(Clause, M, N).
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clpbn_tabled_number_of_clauses(Clause, N) :-
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prolog_load_context(module, M),
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clpbn_tabled_number_of_clauses(Clause, M, N).
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clpbn_tabled_number_of_clauses(M:Clause, _, N) :- !,
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clpbn_tabled_number_of_clauses(Clause, M, N).
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clpbn_tabled_number_of_clauses(Head, M, N) :-
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clpbn_table(Head, M, THead),
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predicate_property(M:THead,number_of_clauses(N)).
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clpbn_is_tabled(M:Clause) :- !,
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clpbn_is_tabled(Clause, M).
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clpbn_is_tabled(Clause) :-
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prolog_load_context(module, M),
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clpbn_is_tabled(Clause, M).
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clpbn_is_tabled(M:Clause, _) :- !,
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clpbn_is_tabled(Clause, M).
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clpbn_is_tabled(Head, M) :-
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clpbn_table(Head, M, _).
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