an implementation of the meld language.
This commit is contained in:
parent
8ca680705d
commit
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70
C/dbase.c
70
C/dbase.c
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@ -4394,6 +4394,73 @@ p_erase(void)
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return TRUE;
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}
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/* increase_reference_counter(+Ref) */
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static Int
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p_increase_reference_counter(void)
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{
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Term t1 = Deref(ARG1);
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LogUpdClause *cl;
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if (IsVarTerm(t1)) {
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Yap_Error(INSTANTIATION_ERROR, t1, "increase_reference_counter/1");
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return FALSE;
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}
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if (!IsDBRefTerm(t1)) {
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Yap_Error(TYPE_ERROR_DBREF, t1, "increase_reference_counter");
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return FALSE;
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}
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cl = (LogUpdClause *)DBRefOfTerm(t1);
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PELOCK(67,cl->ClPred);
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cl->ClRefCount++;
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UNLOCK(cl->ClPred);
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return TRUE;
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}
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/* increase_reference_counter(+Ref) */
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static Int
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p_decrease_reference_counter(void)
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{
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Term t1 = Deref(ARG1);
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LogUpdClause *cl;
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if (IsVarTerm(t1)) {
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Yap_Error(INSTANTIATION_ERROR, t1, "increase_reference_counter/1");
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return FALSE;
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}
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if (!IsDBRefTerm(t1)) {
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Yap_Error(TYPE_ERROR_DBREF, t1, "increase_reference_counter");
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return FALSE;
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}
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cl = (LogUpdClause *)DBRefOfTerm(t1);
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PELOCK(67,cl->ClPred);
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if (cl->ClRefCount) {
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cl->ClRefCount--;
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UNLOCK(cl->ClPred);
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return TRUE;
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}
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UNLOCK(cl->ClPred);
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return FALSE;
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}
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/* erase(+Ref) */
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static Int
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p_current_reference_counter(void)
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{
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Term t1 = Deref(ARG1);
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LogUpdClause *cl;
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if (IsVarTerm(t1)) {
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Yap_Error(INSTANTIATION_ERROR, t1, "increase_reference_counter/1");
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return FALSE;
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}
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if (!IsDBRefTerm(t1)) {
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Yap_Error(TYPE_ERROR_DBREF, t1, "increase_reference_counter");
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return FALSE;
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}
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cl = (LogUpdClause *)DBRefOfTerm(t1);
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return Yap_unify(ARG2, MkIntegerTerm(cl->ClRefCount));
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}
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static Int
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p_erase_clause(void)
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{
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@ -5443,6 +5510,9 @@ Yap_InitDBPreds(void)
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Yap_InitCPred("$recordzp", 4, p_drcdzp, SyncPredFlag|HiddenPredFlag);
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Yap_InitCPred("erase", 1, p_erase, SafePredFlag|SyncPredFlag);
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Yap_InitCPred("$erase_clause", 2, p_erase_clause, SafePredFlag|SyncPredFlag|HiddenPredFlag);
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Yap_InitCPred("increase_reference_count", 1, p_increase_reference_counter, SafePredFlag|SyncPredFlag);
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Yap_InitCPred("decrease_reference_count", 1, p_decrease_reference_counter, SafePredFlag|SyncPredFlag);
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Yap_InitCPred("current_reference_count", 2, p_current_reference_counter, SafePredFlag|SyncPredFlag);
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Yap_InitCPred("erased", 1, p_erased, TestPredFlag | SafePredFlag|SyncPredFlag);
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Yap_InitCPred("instance", 2, p_instance, SyncPredFlag);
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Yap_InitCPred("$instance_module", 2, p_instance_module, SyncPredFlag|HiddenPredFlag);
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@ -0,0 +1,10 @@
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root(a).
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neighbor(a,b).
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neighbor(b,a).
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neighbor(a,c).
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neighbor(c,a).
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temperature(a, 10).
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temperature(b, 12).
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temperature(c, 15).
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@ -0,0 +1,10 @@
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root(a).
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neighbor(a,b).
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neighbor(b,a).
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neighbor(a,c).
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neighbor(c,a).
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temperature(a, 20).
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temperature(b, 12).
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temperature(c, 15).
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@ -0,0 +1,15 @@
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root(a).
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neighbor(a,b).
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neighbor(b,a).
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neighbor(a,c).
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neighbor(c,a).
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neighbor(d,b).
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neighbor(b,d).
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neighbor(d,c).
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neighbor(c,d).
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temperature(a, 10).
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temperature(b, 12).
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temperature(c, 15).
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temperature(d, 20).
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@ -0,0 +1,6 @@
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root(a).
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neighbor(a,b).
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neighbor(b,a).
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temperature(a, 10).
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@ -0,0 +1,34 @@
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%:- ensure_loaded(l
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type logical_neighbor parent(module, first module).
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type maxTemp(module, max float).
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parent(A, A) :- root(A).
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parent(A, B) :-
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neighbor(A, B),
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parent(B, _).
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maxTemp(A, T) :-
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temperature(A, T).
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maxTemp(B, T) :-
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parent(A, B),
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maxTemp(A, T).
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type globalMax(module, max float).
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globalMax(A, T) :-
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maxTemp(A, T),
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root(A).
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globalMax(B, T) :-
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neighbor(A, B),
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globalMax(A, T).
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type localMax(module).
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localMax(A) :-
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temperature(A,T),
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forall
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neighbor(A, B)
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then
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( temperature(B, TT), T > TT ).
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@ -0,0 +1,22 @@
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:- module(meld_core,
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[simulate/1,
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op(1200, fy, (type)),
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op(1150, fy, (logical_neighbor)),
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op( 500, fy, (first)),
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op( 500, fy, (max)),
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op( 950, fy, (forall)),
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op( 900, xfy, (then))
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]).
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:- style_check(all).
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:- reexport(meldi).
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:- reexport(meldc).
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simulate(G) :-
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input_graph(G),
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live.
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@ -0,0 +1,213 @@
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:- style_check(all).
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:- yap_flag(unknown,error).
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:- module(meld_compiler,
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[
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mcompile/1,
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input_graph/1,
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run/1
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]).
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:- use_module(meldi,
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[
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push/1,
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first/2,
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min/3,
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max/3
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]).
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:- use_module(meld).
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:- use_module(library(terms), [
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variable_in_term/2
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]).
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mcompile(Program) :-
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open(Program, read, P),
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init_mcompile(Program),
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repeat,
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read_term(P, Term, [variable_names(Vars), module(meld_compiler)]),
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(
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Term == end_of_file
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->
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!,
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close(P)
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;
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mcompile(Term, Program, Vars),
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fail
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).
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init_mcompile(Program) :-
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retractall(type(_, _, Program, _)).
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mcompile(type(T), Program, Vars) :-
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ground_term(T, Vars),
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type_declaration(T, Program), !.
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mcompile((Head :- Body), _, _Vars) :-
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rule(Head, Body).
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type_declaration(logical_neighbor(T), Program) :- !,
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type_declaration(T, Program).
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type_declaration(T, _) :-
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functor(T, N, A),
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dynamic(meld_program:N/A),
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fail.
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type_declaration(T, Program) :-
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T =.. [P|Args],
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check_aggregate(Args, 1, NewArgs, Aggregation, Arg),
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!,
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NT =.. [P|NewArgs],
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assert_type(NT, Program, aggregation(Aggregation, Arg)).
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type_declaration(T, Program) :-
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assert_type(T, Program, horn).
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assert_type(NT, Program, Agg) :-
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functor(NT, Na, Ar),
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functor(Spec, Na, Ar),
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assert(type(Spec, NT, Program, Agg)).
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check_aggregate([first(Type)|Args], I, [Type|Args], first, I) :- !.
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check_aggregate([max(Type)|Args], I, [Type|Args], max, I) :- !.
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check_aggregate([min(Type)|Args], I, [Type|Args], min, I) :- !.
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check_aggregate([Type|Args], I, [Type|NewArgs], Agg, Arg) :-
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atom(Type),
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I1 is I+1,
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check_aggregate(Args, I1, NewArgs, Agg, Arg).
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ground_term(_, []).
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rule(Head, Body) :-
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bodytolist(Body, L, []),
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compile_goals(L, [], Head).
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compile_goals([], _, _).
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compile_goals([Goal|Goals], Gs, Head) :-
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compile_goal(Goal, Goals, Gs, Head),
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compile_goals(Goals, [Goal|Gs], Head).
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compile_goal((forall G then Do), Goals, Gs, Head) :- !,
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% make sure quantified variables are not seen outside
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quantified_vars(G,Gs+Goals,NG),
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%
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% just collect the body into a number of goals
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%
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collect_body(Gs, [(forall G then Do)|Goals], BLF, BL1),
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% make a backup copy for deletion
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copy_term(h(Head,BLF,BL1,NG), h(Head,DelBLF,DelBL1,DelNG)),
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% add the operation, usually push
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extra_head(Head, BL1, []),
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% add the delete operation
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extra_delete(Head, DelBL1, []),
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% create the body as a conjunction
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listtobody(BLF, Body),
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listtobody(DelBLF, DelBody),
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% done
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assert(meld_program:(run(NG) :- Body)),
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assert(meld_program:(run(delete(DelNG)) :- DelBody)).
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compile_goal(Goal, Goals, Gs, Head) :-
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collect_body(Gs, Goals, BLF, BL1),
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copy_term(h(Head,BLF,BL1,Goal), h(Head,DelBLF,DelBL1,DelGoal)),
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extra_head(Head, BL1, []),
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extra_delete(Head, DelBL1, []),
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listtobody(BLF, Body),
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listtobody(DelBLF, DelBody),
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assert(meld_program:(run(Goal) :- Body)),
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assert(meld_program:(run(deleted(DelGoal)) :- DelBody)).
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% quantified variables should not leave the scope of the forall.
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quantified_vars(G,Extern,NG) :-
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term_variables(G, TVs),
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copy_term(G+TVs,NG+NTVs),
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bind_external(TVs, NTVs, Extern).
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bind_external([], [], _).
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bind_external(V.TVs, NV.NTVs, Extern) :-
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variable_in_term(Extern, V), !,
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V = NV,
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bind_external(TVs, NTVs, Extern).
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bind_external(_.TVs, _.NTVs, Extern) :-
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bind_external(TVs, NTVs, Extern).
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% a very simple version
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%
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collect_body([], []) --> [].
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collect_body([G|Gs], MGs) -->
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process_goal(G),
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collect_body(Gs, MGs).
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collect_body([], [G|Gs]) -->
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process_goal(G),
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collect_body([], Gs).
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process_goal((forall Goal then Conj)) --> !,
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[(Goal, \+ Conj -> fail ; true)].
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process_goal( G ) -->
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[G].
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extra_head(Head) -->
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{ type(Head, _, _, horn) },
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[push(Head)].
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extra_head(Head) -->
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{ type(Head, _, _, aggregation(first, Arg)), freshen(Head, Arg, VHead) },
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[ meld_interpreter:first(VHead, Head)].
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extra_head(Head) -->
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{ type(Head, _, _, aggregation(max, Arg)), freshen(Head, Arg, VHead) },
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[ meld_interpreter:max(VHead, Arg, Head)].
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extra_head(Head) -->
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{ type(Head, _, _, aggregation(min, Arg)), freshen(Head, Arg, VHead) },
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[ meld_interpreter:min(VHead, Arg, Head)].
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extra_delete(Head) -->
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{ type(Head, _, _, horn) },
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[meld_interpreter:deleted(Head)].
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extra_delete(Head) -->
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{ type(Head, _, _, aggregation(first, Arg)), freshen(Head, Arg, VHead) },
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[ meld_interpreter:delete_from_first(VHead, Head)].
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extra_delete(Head) -->
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{ type(Head, _, _, aggregation(max, Arg)), freshen(Head, Arg, VHead) },
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[ meld_interpreter:delete_from_max(VHead, Arg, Head)].
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extra_delete(Head) -->
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{ type(Head, _, _, aggregation(min, Arg)), freshen(Head, Arg, VHead) },
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[ meld_interpreter:delete_from_min(VHead, Arg, Head)].
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freshen(Head, Arg, VHead) :-
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Head =.. [N|Args],
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freshen_arg(Arg, Args, VArgs),
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VHead =.. [N|VArgs].
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freshen_arg(1, [_|Args], [_|Args]) :- !.
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freshen_arg(N, A.Args, A.VArgs) :-
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N1 is N-1,
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freshen_arg(N1, Args, VArgs).
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input_graph(Program) :-
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open(Program, read, P),
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repeat,
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read_term(P, Term, [variable_names(_Vars), module(meld_compiler)]),
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(
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Term == end_of_file
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->
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!,
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close(P)
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;
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add_graph_fact(Term),
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fail
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).
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add_graph_fact(Term) :-
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push(Term).
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bodytolist((G1,G2)) -->
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!,
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bodytolist(G1),
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bodytolist(G2).
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bodytolist(G) -->
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[G].
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listtobody([G], G) :- !.
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listtobody([G|GL], (G,Gs)) :-
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listtobody(GL, Gs).
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@ -0,0 +1,231 @@
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:- module(meld_interpreter,
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[
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live/0,
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delete/1,
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push/1,
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first/2,
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min/3,
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max/3
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]).
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:- use_module(meldp,
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[
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run/1
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]).
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:- use_module(library(nb),
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[
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nb_queue/1,
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nb_queue_enqueue/2,
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nb_queue_dequeue/2
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]).
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:- initialization
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init_meld_queue.
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live :-
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repeat,
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( pop(Goal) ->
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format('-~w~n',[Goal]),
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run(Goal),
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fail
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;
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!,
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done
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).
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done :-
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current_predicate(meld_program:P),
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P \= run/1,
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% P \= neighbor/2,
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% P \= root/1,
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listing(meld_program:P),
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fail.
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done.
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delete(Fact) :-
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nb_getval(meld_queue, Queue),
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retract(meld_program:Fact),
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nb_queue_enqueue(Queue, deleted(Fact)),
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live.
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pop(Goal) :-
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nb_getval(meld_queue, Queue),
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nb_queue_dequeue(Queue, Goal).
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push(Goal) :-
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clause(meld_program:Goal,_,Ref),
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!,
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writeln(Goal+ref),
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increase_reference_count(Ref),
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fail.
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push(Goal) :-
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% format('+~w~n',[Goal]),
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writeln(Goal+0),
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nb_getval(meld_queue, Queue), !,
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assert(meld_program:Goal),
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nb_queue_enqueue(Queue, Goal).
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% create a queue
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init_meld_queue :-
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nb_queue(Queue),
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nb_setval(meld_queue, Queue).
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first(Skel,Goal) :-
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meld_program:Skel, !,
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cache(Goal).
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first(_,Goal) :-
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cache(Goal),
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push(Goal).
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max(Skel,Arg,Goal) :-
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meld_program:Skel,
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arg(Arg, Skel, A0),
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arg(Arg, Goal, AN),
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AN =< A0, !,
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cache(Goal).
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max(Skel,_,Goal) :-
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clean(Skel),
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cache(Goal),
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push(Goal).
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min(Skel,Arg,Goal) :-
|
||||
meld_program:Skel,
|
||||
arg(Arg, Skel, A0),
|
||||
arg(Arg, Goal, AN),
|
||||
AN >= A0, !,
|
||||
cache(Goal).
|
||||
min(Skel,_,Goal) :-
|
||||
clean(Skel),
|
||||
cache(Goal),
|
||||
push(Goal).
|
||||
|
||||
clean(Skel) :-
|
||||
% format('D~w~n',[Skel]),
|
||||
retractall(meld_program:Skel).
|
||||
|
||||
cache(Goal) :-
|
||||
writeln(cache(Goal)),fail.
|
||||
cache(Goal) :-
|
||||
clause(meld_cache:Goal,_,Ref),
|
||||
!,
|
||||
increase_reference_count(Ref).
|
||||
cache(Goal) :-
|
||||
assert(meld_cache:Goal).
|
||||
|
||||
|
||||
deleted(Goal) :-
|
||||
clause(meld_program:Goal,_,Ref),
|
||||
decrease_reference_count(Ref),
|
||||
!,
|
||||
fail.
|
||||
deleted(Goal) :-
|
||||
% format('-~w~n',[Goal]),
|
||||
nb_getval(meld_queue, Queue), !,
|
||||
retract(meld_program:Goal),
|
||||
nb_queue_enqueue(Queue, deleted(Goal)).
|
||||
|
||||
|
||||
|
||||
%
|
||||
% first, cleanup cache
|
||||
%
|
||||
delete_from_first(_,Goal) :-
|
||||
clause(meld_cache:Goal,_,Ref),
|
||||
(
|
||||
decrease_reference_count(Ref)
|
||||
->
|
||||
fail
|
||||
;
|
||||
erase(Ref),
|
||||
fail
|
||||
).
|
||||
delete_from_first(_,Goal) :-
|
||||
clause(meld_program:Goal,_,Ref),
|
||||
decrease_reference_count(Ref),
|
||||
!,
|
||||
fail.
|
||||
delete_from_first(VGoal,Goal) :-
|
||||
retract(meld_program:Goal),
|
||||
push(deleted(Goal)),
|
||||
once(meld_cache:VGoal),
|
||||
push(VGoal).
|
||||
|
||||
|
||||
delete_from_max(VGoal,Arg,Goal) :-
|
||||
clause(meld_cache:Goal,_,Ref),
|
||||
(
|
||||
decrease_reference_count(Ref)
|
||||
->
|
||||
clause(meld_program:Goal,_,CRef),
|
||||
decrease_reference_count(CRef),
|
||||
fail
|
||||
;
|
||||
erase(Ref),
|
||||
new_max(VGoal, Arg, Goal)
|
||||
).
|
||||
|
||||
new_max(VGoal,Arg,Goal) :-
|
||||
% format('-~w~n',[Goal]),
|
||||
retract(meld_program:Goal),
|
||||
push(deleted(Goal)),
|
||||
writeln(delete_from_max(VGoal,Arg,Goal)),
|
||||
maxval(Arg, meld_cache:VGoal, VGoal),
|
||||
push(VGoal).
|
||||
|
||||
delete_from_min(VGoal,Arg,Goal) :-
|
||||
clause(meld_cache:Goal,_,Ref),
|
||||
(
|
||||
decrease_reference_count(Ref)
|
||||
->
|
||||
clause(meld_program:Goal,_,CRef),
|
||||
decrease_reference_count(CRef),
|
||||
fail
|
||||
;
|
||||
erase(Ref),
|
||||
new_min(VGoal, Arg, Goal)
|
||||
).
|
||||
|
||||
new_min(VGoal,Arg,Goal) :-
|
||||
% format('-~w~n',[Goal]),
|
||||
retract(meld_program:Goal),
|
||||
push(deleted(Goal)),
|
||||
writeln(delete_from_min(VGoal,Arg,Goal)),
|
||||
minval(Arg, meld_cache:VGoal, VGoal),
|
||||
push(VGoal).
|
||||
|
||||
minval(_,_,_) :-
|
||||
nb_setval(min, +inf),
|
||||
nb_setval(min_arg, '$none'),
|
||||
fail.
|
||||
minval(V,G,GMax) :-
|
||||
call(G),
|
||||
nb_getval(min, V0),
|
||||
V < V0,
|
||||
nb_setval(min, V),
|
||||
nb_setval(min_arg, V.GMax),
|
||||
fail.
|
||||
minval(V,_,GMax) :-
|
||||
nb_getval(min_arg, V.GMax).
|
||||
|
||||
|
||||
maxval(_,_,_) :-
|
||||
nb_setval(max, -inf),
|
||||
nb_setval(max_arg, '$none'),
|
||||
fail.
|
||||
maxval(V,G,GMax) :-
|
||||
call(G),
|
||||
nb_getval(max, V0),
|
||||
V > V0,
|
||||
nb_setval(max, V),
|
||||
nb_setval(max_arg, V.GMax),
|
||||
fail.
|
||||
maxval(V,_,GMax) :-
|
||||
nb_getval(max_arg, V.GMax).
|
||||
|
|
@ -0,0 +1,23 @@
|
|||
:- module(meld_program,
|
||||
[
|
||||
run/1
|
||||
]).
|
||||
|
||||
|
||||
:- use_module(meldi,
|
||||
[
|
||||
push/1,
|
||||
first/2,
|
||||
min/3,
|
||||
max/3
|
||||
]).
|
||||
|
||||
|
||||
% built-ins.
|
||||
:- dynamic root/1, neighbor/2, temperature/2.
|
||||
|
||||
trace(A,B) :- !,
|
||||
writeln((A:-B)),
|
||||
trace.
|
||||
|
||||
|
Reference in New Issue