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yap-6.3/pl/modules.yap
2009-10-16 08:31:23 +01:00

682 lines
20 KiB
Prolog

/*************************************************************************
* *
* YAP Prolog *
* *
* Yap Prolog was developed at NCCUP - Universidade do Porto *
* *
* Copyright L.Damas, V.S.Costa and Universidade do Porto 1985-1997 *
* *
**************************************************************************
* *
* File: modules.pl *
* Last rev: *
* mods: *
* comments: module support *
* *
*************************************************************************/
% module handling
'$consulting_file_name'(Stream,F) :-
'$file_name'(Stream, F).
'$module'(_,N,P) :-
'$module_dec'(N,P).
'$module'(O,N,P,Opts) :- !,
'$module'(O,N,P),
'$process_module_decls_options'(Opts,module(Opts,N,P)).
'$process_module_decls_options'(Var,Mod) :-
var(Var), !,
'$do_error'(instantiation_error,Mod).
'$process_module_decls_options'([],_) :- !.
'$process_module_decls_options'([H|L],M) :- !,
'$process_module_decls_option'(H,M),
'$process_module_decls_options'(L,M).
'$process_module_decls_options'(T,M) :-
'$do_error'(type_error(list,T),M).
'$process_module_decls_option'(Var,M) :-
var(Var),
'$do_error'(instantiation_error,M).
'$process_module_decls_option'(At,_) :-
atom(At), !,
'$use_module'(At).
'$process_module_decls_option'(library(L),_) :- !,
'$use_module'(library(L)).
'$process_module_decls_option'(hidden(Bool),M) :- !,
'$process_hidden_module'(Bool, M).
'$process_module_decls_option'(Opt,M) :-
'$do_error'(domain_error(module_decl_options,Opt),M).
'$process_hidden_module'(TNew,M) :-
'$convert_true_off_mod3'(TNew, New, M),
source_mode(Old, New),
'$prepare_restore_hidden'(Old,New).
'$convert_true_off_mod3'(true, off, _).
'$convert_true_off_mod3'(false, on, _).
'$convert_true_off_mod3'(X, _, M) :-
'$do_error'(domain_error(module_decl_options,hidden(X)),M).
'$prepare_restore_hidden'(Old,Old) :- !.
'$prepare_restore_hidden'(Old,New) :-
recorda('$system_initialisation', source_mode(New,Old), _).
module(N) :-
var(N),
'$do_error'(instantiation_error,module(N)).
module(N) :-
atom(N), !,
% set it as current module.
'$current_module'(_,N).
module(N) :-
'$do_error'(type_error(atom,N),module(N)).
'$module_dec'(N,P) :-
'$current_module'(_,N),
nb_getval('$consulting_file',F),
'$add_module_on_file'(N, F, P).
'$add_module_on_file'(Mod, F, Exports) :-
recorded('$module','$module'(F0,Mod,_),R), !,
'$add_preexisting_module_on_file'(F, F0, Mod, Exports, R).
'$add_module_on_file'(Mod, F, Exports) :-
'$process_exports'(Exports,Mod,ExportedPreds),
recorda('$module','$module'(F,Mod,ExportedPreds),_).
'$process_exports'([],_,[]).
'$process_exports'([Name/Arity|Exports],Mod,[Name/Arity|ExportedPreds]):- !,
'$process_exports'(Exports,Mod,ExportedPreds).
'$process_exports'([Name//Arity|Exports],Mod,[Name/Arity2|ExportedPreds]):- !,
Arity2 is Arity+2,
'$process_exports'(Exports,Mod,ExportedPreds).
'$process_exports'([op(Prio,Assoc,Name)|Exports],Mod,ExportedPreds) :- !,
op(Prio,Assoc,Name),
'$process_exports'(Exports,Mod,ExportedPreds).
'$process_exports'([Trash|_],Mod,_) :-
'$do_error'(type_error(predicate_indicator,Trash),module(Mod,[Trash])).
% redefining a previously-defined file, no problem.
'$add_preexisting_module_on_file'(F, F, Mod, Exports, R) :- !,
erase(R),
( recorded('$import','$import'(Mod,_,_,_,_,_),R), erase(R), fail; true),
recorda('$module','$module'(F,Mod,Exports),_).
'$add_preexisting_module_on_file'(F,F0,Mod,Exports,R) :-
repeat,
format(user_error, "The module ~a is being redefined.~n Old file: ~a~n New file: ~a~nDo you really want to redefine it? (y or n)",[Mod,F0,F]),
'$mod_scan'(C), !,
( C is "y" ->
'$add_preexisting_module_on_file'(F, F, Mod, Exports, R)
;
'$do_error'(permission_error(module,redefined,Mod),module(Mod,Exports))
).
'$mod_scan'(C) :-
get0(C),
'$skipeol'(C),
(C is "y" ; C is "n").
'$import'([],_,_) :- !.
'$import'([N/K|L],M,T) :-
integer(K), atom(N), !,
'$do_import'(N, K, M, T),
'$import'(L,M,T).
'$import'([PS|L],_,_) :-
'$do_error'(domain_error(predicate_spec,PS),import([PS|L])).
% $use_preds(Imports,Publics,Mod,M)
'$use_preds'(Imports,Publics,Mod,M) :- var(Imports), !,
'$import'(Publics,Mod,M).
'$use_preds'(M:L,Publics,Mod,_) :-
'$use_preds'(L,Publics,Mod,M).
'$use_preds'([],_,_,_) :- !.
'$use_preds'([P|Ps],Publics,Mod,M) :- !,
'$use_preds'(P,Publics,Mod,M),
'$use_preds'(Ps,Publics,Mod,M).
'$use_preds'(N/K,Publics,M,Mod) :-
( lists:memberchk(N/K,Publics) -> true ;
print_message(warning,import(N/K,Mod,M,private))
),
'$do_import'(N, K, M, Mod).
'$do_import'(N, K, M, T) :-
functor(G,N,K),
'$follow_import_chain'(M,G,M0,G0),
functor(G0,N1,K),
( '$check_import'(M0,T,N1,K) ->
( T = user ->
( recordzifnot('$import','$import'(M0,user,G0,G,N,K),_) -> true ; true)
;
( recordaifnot('$import','$import'(M0,T,G0,G,N,K),_) -> true ; true )
)
;
true
).
'$follow_import_chain'(M,G,M0,G0) :-
recorded('$import','$import'(M1,M,G1,G,_,_),_), !,
'$follow_import_chain'(M1,G1,M0,G0).
'$follow_import_chain'(M,G,M,G).
'$check_import'(M,T,N,K) :-
recorded('$import','$import'(MI,T,_,_,N,K),R),
\+ '$module_produced by'(M,T,N,K), !,
format(user_error,"NAME CLASH: ~w was already imported to module ~w;~n",[MI:N/K,T]),
format(user_error," Do you want to import it from ~w ? [y or n] ",M),
repeat,
get0(C), '$skipeol'(C),
( C is "y" -> erase(R), !;
C is "n" -> !, fail;
format(user_error, ' Please answer with ''y'' or ''n'' ',[]), fail
).
'$check_import'(_,_,_,_).
'$module_produced by'(M,M0,N,K) :-
recorded('$import','$import'(M,M0,_,_,N,K),_), !.
'$module_produced by'(M,M0,N,K) :-
recorded('$import','$import'(MI,M0,G1,_,N,K),_),
functor(G1, N1, K1),
'$module_produced by'(M,MI,N1,K1).
% expand module names in a clause
% A1: Input Clause
% A2: Output Class to Compiler (lives in module HM)
% A3: Output Class to clause/2 and listing (lives in module HM)
%
% modules:
% A4: module for body of clause (this is the one used in looking up predicates)
% A5: context module (this is the current context
% A6: head module (this is the one used in compiling and accessing).
%
%
'$module_expansion'((H:-B),(H:-B1),(H:-BOO),M,HM) :- !,
'$is_mt'(M, H, B, IB, MM),
'$module_u_vars'(H,UVars,M), % collect head variables in
% expanded positions
'$module_expansion'(IB,B1,BO,M,MM,HM,UVars),
('$full_clause_optimisation'(H, M, BO, BOO) ->
true
;
BO = BOO
).
% do not expand bodyless clauses.
'$module_expansion'(H,H,H,_,_).
'$trace_module'(X) :-
telling(F),
tell('P0:debug'),
write(X),nl,
tell(F), fail.
'$trace_module'(_).
'$trace_module'(X,Y) :- X==Y, !.
'$trace_module'(X,Y) :-
telling(F),
tell('~/.dbg.modules'),
write('***************'), nl,
portray_clause(X),
portray_clause(Y),
tell(F),fail.
'$trace_module'(_,_).
% expand module names in a body
% args are:
% goals to expand
% code to pass to listing
% code to pass to compiler
% current module for looking up preds M
% default module DM
% head module HM
%
% to understand the differences, you can consider:
%
% a:(d:b(X) :- g:c(X), d(X), user:hello(X)).
%
% when we process meta-predicate c, HM=d, DM=a, BM=a, M=g and we should get:
%
% d:b(X) :- g:c(g:X), a:d(X), user:hello(X).
%
% on the other hand,
%
% a:(d:b(X) :- c(X), d(X), d:e(X)).
%
% will give
%
% d:b(X) :- a:c(a:X), a:d(X), e(X).
%
%
% head variables.
% goals or arguments/sub-arguments?
% I cannot use call here because of format/3
'$module_expansion'(V,NG,NG,_,MM,_,HVars) :-
var(V), !,
( '$not_in_vars'(V,HVars)
->
NG = call(MM:V)
;
NG = call(V)
).
'$module_expansion'((A,B),(A1,B1),(AO,BO),M,MM,HM,HVars) :- !,
'$module_expansion'(A,A1,AO,M,MM,HM,HVars),
'$module_expansion'(B,B1,BO,M,MM,HM,HVars).
'$module_expansion'((A;B),(A1;B1),(AO;BO),M,MM,HM,HVars) :- var(A), !,
'$module_expansion'(A,A1,AO,M,MM,HM,HVars),
'$module_expansion'(B,B1,BO,M,MM,HM,HVars).
'$module_expansion'((A*->B;C),(A1*->B1;C1),(yap_hacks:current_choicepoint(DCP),AO,yap_hacks:cut_at(DCP),BO; CO),M,MM,HM,HVars) :- !,
'$module_expansion'(A,A1,AOO,M,MM,HM,HVars),
'$clean_cuts'(AOO, AO),
'$module_expansion'(B,B1,BO,M,MM,HM,HVars),
'$module_expansion'(C,C1,CO,M,MM,HM,HVars).
'$module_expansion'((A;B),(A1;B1),(AO;BO),M,MM,HM,HVars) :- !,
'$module_expansion'(A,A1,AO,M,MM,HM,HVars),
'$module_expansion'(B,B1,BO,M,MM,HM,HVars).
'$module_expansion'((A|B),(A1|B1),(AO|BO),M,MM,HM,HVars) :- !,
'$module_expansion'(A,A1,AO,M,MM,HM,HVars),
'$module_expansion'(B,B1,BO,M,MM,HM,HVars).
'$module_expansion'((A->B),(A1->B1),(AO->BO),M,MM,HM,HVars) :- !,
'$module_expansion'(A,A1,AOO,M,MM,HM,HVars),
'$clean_cuts'(AOO, AO),
'$module_expansion'(B,B1,BO,M,MM,HM,HVars).
'$module_expansion'(\+A,\+A1,\+AO,M,MM,HM,HVars) :- !,
'$module_expansion'(A,A1,AO,M,MM,HM,HVars).
'$module_expansion'(not(A),not(A1),not(AO),M,MM,HM,HVars) :- !,
'$module_expansion'(A,A1,AO,M,MM,HM,HVars).
'$module_expansion'(true,true,true,_,_,_,_) :- !.
'$module_expansion'(fail,fail,fail,_,_,_,_) :- !.
'$module_expansion'(false,false,false,_,_,_,_) :- !.
% if I don't know what the module is, I cannot do anything to the goal,
% so I just put a call for later on.
'$module_expansion'(M:G,call(M:G),'$execute_wo_mod'(G,M),_,_,_,_) :- var(M), !.
'$module_expansion'(M:G,G1,GO,_,CM,HM,HVars) :- !,
'$module_expansion'(G,G1,GO,M,CM,HM,HVars).
'$module_expansion'(G, G1, GO, CurMod, MM, HM, HVars) :-
'$pred_goal_expansion_on',
( user:goal_expansion(G, CurMod, GI)
->
true
;
(
'$pred_exists'(goal_expansion(G,GI), CurMod)
->
call(CurMod:goal_expansion(G, GI))
)
;
user:goal_expansion(G, GI)
), !,
'$module_expansion'(GI, G1, GO, CurMod, MM, HM, HVars).
'$module_expansion'(G, G1, GO, CurMod, MM, HM,HVars) :-
% is this imported from some other module M1?
'$imported_pred'(G, CurMod, GG, M1),
!,
'$module_expansion'(GG, G1, GO, M1, MM, HM,HVars).
'$module_expansion'(G, G1, GO, CurMod, MM, HM,HVars) :-
'$meta_expansion'(G, CurMod, MM, HM, GI, HVars), !,
'$complete_goal_expansion'(GI, CurMod, MM, HM, G1, GO, HVars).
'$module_expansion'(G, G1, GO, CurMod, MM, HM, HVars) :-
'$complete_goal_expansion'(G, CurMod, MM, HM, G1, GO, HVars).
% args are:
% goal to expand
% current module for looking up pred
% current module for looking up pred
% current module from top-level clause
% goal to pass to listing
% goal to pass to compiler
% head variables.
'$complete_goal_expansion'(G, M, CM, HM, G1, G2, HVars) :-
'$all_system_predicate'(G,M,ORIG), !,
% make built-in processing transparent.
'$match_mod'(G, M, ORIG, HM, G1),
'$c_built_in'(G1, M, Gi),
(Gi \== G1 ->
'$module_expansion'(Gi, G2, _, M, CM, HM, HVars)
;
G2 = G1
).
'$complete_goal_expansion'(G, GMod, _, HM, NG, NG, _) :-
'$match_mod'(G, GMod, GMod, HM, NG).
%'$match_mod'(G, GMod, GMod, NG) :- !,
% NG = G.
'$match_mod'(G, _, SM, _, G) :- SM == prolog, !. % prolog: needs no module info.
% same module as head, and body goal (I cannot get rid of qualifier before
% meta-call.
'$match_mod'(G, HMod, _, HM, G) :- HMod == HM, !.
'$match_mod'(G, GMod, _, _, GMod:G).
% be careful here not to generate an undefined exception.
'$imported_pred'(G, ImportingMod, G0, ExportingMod) :-
'$enter_undefp',
'$undefined'(G, ImportingMod),
recorded('$import','$import'(ExportingMod,ImportingMod,G0,G,_,_),_),
ExportingMod \= ImportingMod, !,
'$exit_undefp'.
'$imported_pred'(G, ImportingMod, G0, ExportingMod) :-
'$undefined'(G, ImportingMod),
swi:swi_predicate_table(ImportingMod,G,ExportingMod,G0),
ExportingMod \= ImportingMod,
'$exit_undefp'.
'$imported_pred'(G, ImportingMod, _, _) :-
'$exit_undefp',
fail.
% module_transparent declaration
%
:- dynamic('$module_transparent'/4).
'$module_transparent'((P,Ps), M) :- !,
'$module_transparent'(P, M),
'$module_transparent'(Ps, M).
'$module_transparent'(M:D, _) :- !,
'$module_transparent'(D, M).
'$module_transparent'(F/N, M) :-
'$module_transparent'(F,M,N,_), !.
'$module_transparent'(F/N, M) :-
functor(P,F,N),
asserta(prolog:'$module_transparent'(F,M,N,P)),
'$flags'(P, M, Fl, Fl),
NFlags is Fl \/ 0x200004,
'$flags'(P, M, Fl, NFlags).
'$is_mt'(M, H0, B, (context_module(CM),B), CM) :-
'$module_transparent'(_, M, _, H), !.
'$is_mt'(M, _, B, B, M).
% meta_predicate declaration
% records $meta_predicate(SourceModule,Functor,Arity,Declaration)
% directive now meta_predicate Ps :- $meta_predicate(Ps).
:- dynamic('$meta_predicate'/4).
:- multifile '$meta_predicate'/4.
'$meta_predicate'(P, M) :-
var(P),
'$do_error'(instantiation_error,module(M)).
'$meta_predicate'((P,Ps), M) :- !,
'$meta_predicate'(P, M),
'$meta_predicate'(Ps, M).
'$meta_predicate'(M:D, _) :- !,
'$meta_predicate'(D, M).
'$meta_predicate'(P, M1) :-
'$install_meta_predicate'(P, M1).
'$install_meta_predicate'(P, M1) :-
functor(P,F,N),
( M1 = prolog -> M = _ ; M1 = M),
( retractall('$meta_predicate'(F,M,N,_)), fail ; true),
asserta(prolog:'$meta_predicate'(F,M,N,P)),
'$flags'(P, M1, Fl, Fl),
NFlags is Fl \/ 0x200000,
'$flags'(P, M1, Fl, NFlags).
% return list of vars in expanded positions on the head of a clause.
%
% these variables should not be expanded by meta-calls in the body of the goal.
%
'$module_u_vars'(H,UVars,M) :-
functor(H,F,N),
'$meta_predicate'(F,M,N,D), !,
'$module_u_vars'(N,D,H,UVars).
'$module_u_vars'(_,[],_).
'$module_u_vars'(0,_,_,[]) :- !.
'$module_u_vars'(I,D,H,[Y|L]) :-
arg(I,D,X), ( X=':' ; integer(X)),
arg(I,H,Y), var(Y), !,
I1 is I-1,
'$module_u_vars'(I1,D,H,L).
'$module_u_vars'(I,D,H,L) :-
I1 is I-1,
'$module_u_vars'(I1,D,H,L).
% expand arguments of a meta-predicate
% $meta_expansion(ModuleWhereDefined,CurrentModule,Goal,ExpandedGoal,MetaVariables)
'$meta_expansion'(G,Mod,MP,HM,G1,HVars) :-
functor(G,F,N),
'$meta_predicate'(F,Mod,N,D), !,
% format(user_error,'[ ~w ',[G]),
functor(G1,F,N),
'$meta_expansion_loop'(N, D, G, G1, HVars, Mod, MP, HM).
% format(user_error,' gives ~w]`n',[G1]).
% expand argument
'$meta_expansion_loop'(0,_,_,_,_,_,_,_) :- !.
'$meta_expansion_loop'(I,D,G,NG,HVars,CurMod,M,HM) :-
arg(I,D,X), (X==':' ; integer(X)),
arg(I,G,A), '$do_expand'(A,HVars),
!,
arg(I,NG,M:A),
I1 is I-1,
'$meta_expansion_loop'(I1, D, G, NG, HVars, CurMod, M, HM).
'$meta_expansion_loop'(I, D, G, NG, HVars, CurMod, M, HM) :-
arg(I,G,A),
arg(I,NG,A),
I1 is I-1,
'$meta_expansion_loop'(I1, D, G, NG, HVars, CurMod, M, HM).
% check if an argument should be expanded
'$do_expand'(V,HVars) :- var(V), !, '$not_in_vars'(V,HVars).
'$do_expand'(_:_,_) :- !, fail.
'$do_expand'(_,_).
'$not_in_vars'(_,[]).
'$not_in_vars'(V,[X|L]) :- X\==V, '$not_in_vars'(V,L).
current_module(Mod) :-
'$all_current_modules'(Mod),
\+ '$system_module'(Mod).
current_module(Mod,TFN) :-
'$all_current_modules'(Mod),
( recorded('$module','$module'(TFN,Mod,_Publics),_) -> true ; TFN = user ).
source_module(Mod) :-
'$current_module'(Mod).
% comma has its own problems.
:- '$install_meta_predicate'((:,:), prolog).
:- meta_predicate
abolish(:),
abolish(:,+),
all(?,:,?),
assert(:),
assert(:,+),
assert_static(:),
asserta(:),
asserta(:,+),
asserta_static(:),
assertz(:),
assertz(:,+),
assertz_static(:),
bagof(?,:,?),
bb_get(:,-),
bb_put(:,+),
bb_delete(:,?),
bb_update(:,?,?),
call(:),
call(:,?),
call(:,?,?),
call(:,?,?,?),
call_with_args(:),
call_with_args(:,?),
call_with_args(:,?,?),
call_with_args(:,?,?,?),
call_with_args(:,?,?,?,?),
call_with_args(:,?,?,?,?,?),
call_with_args(:,?,?,?,?,?,?),
call_with_args(:,?,?,?,?,?,?,?),
call_with_args(:,?,?,?,?,?,?,?,?),
call_with_args(:,?,?,?,?,?,?,?,?,?),
format(+,:),
format(+,+,:),
call_cleanup(:,:),
call_cleanup(:,?,:),
setup_call_cleanup(:,:,:),
setup_call_catcher_cleanup(:,:,?,:),
call_residue(:,?),
call_residue_vars(:,?),
catch(:,+,:),
clause(:,?),
clause(:,?,?),
compile(:),
consult(:),
current_op(?,?,:),
current_predicate(:),
current_predicate(?,:),
depth_bound_call(:,+),
discontiguous(:),
ensure_loaded(:),
findall(?,:,?),
findall(?,:,?,?),
forall(:,:),
freeze(?,:),
hide_predicate(:),
if(:,:,:),
ignore(:),
incore(:),
listing(:),
multifile(:),
nospy(:),
not(:),
once(:),
phrase(:,?),
phrase(:,?,+),
predicate_property(:,?),
predicate_statistics(:,-,-,-),
on_exception(+,:,:),
reconsult(:),
retract(:),
retract(:,?),
retractall(:),
reconsult(:),
setof(?,:,?),
spy(:),
unknown(+,:),
use_module(:),
use_module(:,?),
use_module(?,:,?),
when(?,:),
with_mutex(+,:),
(: -> :),
(: *-> :),
(: ; :),
^(+,:),
\+ : .
%
% get rid of a module and of all predicates included in the module.
%
abolish_module(Mod) :-
recorded('$module','$module'(_,Mod,_),R), erase(R),
fail.
abolish_module(Mod) :-
recorded('$import','$import'(Mod,_,_,_,_,_),R), erase(R),
fail.
abolish_module(Mod) :-
'$current_predicate'(Mod,Na,Ar),
abolish(Mod:Na/Ar),
fail.
abolish_module(_).
'$reexport'(ModuleSource, Spec, Module) :-
nb_getval('$consulting_file',TopFile),
(
Spec == all
->
Goal = reexport(ModuleSource)
;
Goal = reexport(ModuleSource,Spec)
),
absolute_file_name(ModuleSource, File),
'$load_files'(File, [if(not_loaded),imports([])], Goal),
recorded('$module', '$module'(FullFile, Mod, Exports),_),
atom_concat(File, _, FullFile), !,
(recorded('$import','$import'(Mod,Module,G,G1,N0,K0),_), writeln('$import'(Mod,Module,G,G1,N0,K0)), fail; true),
'$convert_for_reexport'(Spec, Exports, Tab, MyExports, Goal),
'$add_to_imports'(Tab, Module, Mod),
recorded('$lf_loaded','$lf_loaded'(TopFile,TopModule,_,_),_),
recorded('$module', '$module'(CurrentFile, Module, ModExports), Ref),
erase(Ref),
lists:append(ModExports, MyExports, AllExports),
recorda('$module', '$module'(CurrentFile, Module, AllExports), _),
'$import'(MyExports, Module, TopModule).
'$convert_for_reexport'(all, Exports, Tab, MyExports, _) :-
'$simple_conversion'(Exports, Tab, MyExports).
'$convert_for_reexport'([P1|Ps], Exports, Tab, MyExports, Goal) :-
'$clean_conversion'([P1|Ps], Exports, Tab, MyExports, Goal).
'$convert_for_reexport'(except(List), Exports, Tab, MyExports, Goal) :-
'$neg_conversion'(Exports, List, Tab, MyExports, Goal).
'$simple_conversion'([], [], []).
'$simple_conversion'([P|Exports], [P-P|Tab], [P|MyExports]) :-
'$simple_conversion'(Exports, Tab, MyExports).
'$clean_conversion'([], _, [], [], _).
'$clean_conversion'([P1|Ps], List, [P1-P1|Tab], [P1|MyExports], Goal) :-
lists:memberchk(P1, List), !,
'$clean_conversion'(Ps, List, Tab, MyExports, Goal).
'$clean_conversion'([(N1/A1 as N2)|Ps], List, [N1/A1-N2/A1|Tab], [N2/A1|MyExports], Goal) :-
lists:memberchk(N1/A1, List), !,
'$clean_conversion'(Ps, List, Tab, MyExports, Goal).
'$clean_conversion'([P|_], _List, _, _, Goal) :-
'$do_error'(domain_error(module_reexport_predicates,P), Goal).
'$neg_conversion'([], _, [], [], _).
'$neg_conversion'([P1|Ps], List, Tab, MyExports, Goal) :-
lists:memberchk(P1, List), !,
'$neg_conversion'(Ps, List, Tab, MyExports, Goal).
'$neg_conversion'([N1/A1|Ps], List, [N1/A1-N2/A1|Tab], [N2/A1|MyExports], Goal) :-
lists:memberchk(N1/A1 as N2, List), !,
'$neg_conversion'(Ps, List, Tab, MyExports, Goal).
'$neg_conversion'([P|Ps], List, [P-P|Tab], [P|MyExports], Goal) :-
'$neg_conversion'(Ps, List, Tab, MyExports, Goal).
'$add_to_imports'([], _, _).
'$add_to_imports'([N0/K0-N1/K1|Tab], Mod, ModR) :-
functor(G,N0,K0),
G=..[N0|Args],
G1=..[N1|Args],
recordaifnot('$import','$import'(ModR,Mod,G,G1,N0,K0),_), !,
'$add_to_imports'(Tab, Mod, ModR).
% I assume the clause has been processed, so the
% var case is long gone! Yes :)
'$clean_cuts'(G,(yap_hacks:current_choicepoint(DCP),NG)) :-
'$conj_has_cuts'(G,DCP,NG,OK), OK == ok, !.
'$clean_cuts'(G,G).
'$conj_has_cuts'(!,DCP,'$$cut_by'(DCP), ok) :- !.
'$conj_has_cuts'((G1,G2),DCP,(NG1,NG2), OK) :- !,
'$conj_has_cuts'(G1, DCP, NG1, OK),
'$conj_has_cuts'(G2, DCP, NG2, OK).
'$conj_has_cuts'((G1;G2),DCP,(NG1;NG2), OK) :- !,
'$conj_has_cuts'(G1, DCP, NG1, OK),
'$conj_has_cuts'(G2, DCP, NG2, OK).
'$conj_has_cuts'((G1->G2),DCP,(G1;NG2), OK) :- !,
% G1: the system must have done it already
'$conj_has_cuts'(G2, DCP, NG2, OK).
'$conj_has_cuts'((G1*->G2),DCP,(G1;NG2), OK) :- !,
% G1: the system must have done it already
'$conj_has_cuts'(G2, DCP, NG2, OK).
'$conj_has_cuts'(if(G1,G2,G3),DCP,if(G1,NG2,NG3), OK) :- !,
% G1: the system must have done it already
'$conj_has_cuts'(G2, DCP, NG2, OK),
'$conj_has_cuts'(G3, DCP, NG3, OK).
'$conj_has_cuts'(G,_,G, _).