/*************************************************************************
*									 *
*	 YAP Prolog 							 *
*									 *
*	Yap Prolog was developed at NCCUP - Universidade do Porto	 *
*									 *
* Copyright L.Damas, V.S.Costa and Universidade do Porto 1985-1997	 *
*									 *
**************************************************************************
*									 *
* File:		tabling.yap						 *
* Last rev:	8/2/88							 *
* mods:									 *
* comments:	support tabling predicates				 *
*									 *
*************************************************************************/

:- meta_predicate table(:), is_tabled(:), tabling_mode(:), abolish_table(:), show_table(:), table_statistics(:).



/******************
*     table/1     *
******************/

table(Pred) :-
   '$current_module'(Mod),
   '$do_table'(Mod,Pred).

'$do_table'(Mod,Pred) :-
    var(Pred), !,
   '$do_error'(instantiation_error,table(Mod:Pred)).
'$do_table'(_,Mod:Pred) :- !,
   '$do_table'(Mod,Pred).
'$do_table'(_,[]) :- !.
'$do_table'(Mod,[HPred|TPred]) :- !,
   '$do_table'(Mod,HPred),
   '$do_table'(Mod,TPred).
'$do_table'(Mod,(Pred1,Pred2)) :- !,
   '$do_table'(Mod,Pred1),
   '$do_table'(Mod,Pred2).
'$do_table'(Mod,PredName/PredArity) :- 
   atom(PredName), 
   integer(PredArity),
   functor(PredFunctor,PredName,PredArity), !,
   '$set_table'(Mod,PredFunctor).
'$do_table'(Mod,Pred) :-
   '$do_error'(type_error(callable,Mod:Pred),table(Mod:Pred)).

'$set_table'(Mod,PredFunctor) :-
   '$undefined'(PredFunctor,Mod), !,
   '$c_table'(Mod,PredFunctor).
'$set_table'(Mod,PredFunctor) :-
   '$flags'(PredFunctor,Mod,Flags,Flags),
   Flags /\ 0x1991F880 =:= 0,
   '$c_table'(Mod,PredFunctor), !.
'$set_table'(Mod,PredFunctor) :-
   functor(PredFunctor,PredName,PredArity), 
   '$do_error'(permission_error(modify,table,Mod:PredName/PredArity),table(Mod:PredName/PredArity)).



/**********************
*     is_tabled/1     *
**********************/

is_tabled(Pred) :- 
   '$current_module'(Mod), 
   '$do_is_tabled'(Mod,Pred).

'$do_is_tabled'(Mod,Pred) :- 
   var(Pred), !, 
   '$do_error'(instantiation_error,is_tabled(Mod:Pred)).
'$do_is_tabled'(_,Mod:Pred) :- !, 
   '$do_is_tabled'(Mod,Pred).
'$do_is_tabled'(_,[]) :- !.
'$do_is_tabled'(Mod,[HPred|TPred]) :- !,
   '$do_is_tabled'(Mod,HPred),
   '$do_is_tabled'(Mod,TPred).
'$do_is_tabled'(Mod,(Pred1,Pred2)) :- !,
   '$do_is_tabled'(Mod,Pred1),
   '$do_is_tabled'(Mod,Pred2).
'$do_is_tabled'(Mod,PredName/PredArity) :- 
   atom(PredName), 
   integer(PredArity),
   functor(PredFunctor,PredName,PredArity),
   '$flags'(PredFunctor,Mod,Flags,Flags), !,
   Flags /\ 0x000040 =\= 0.
'$do_is_tabled'(Mod,Pred) :- 
   '$do_error'(type_error(callable,Mod:Pred),is_tabled(Mod:Pred)).



/*************************
*     tabling_mode/2     *
*************************/

tabling_mode(Pred,Options) :- 
   '$current_module'(Mod), 
   '$do_tabling_mode'(Mod,Pred,Options).

'$do_tabling_mode'(Mod,Pred,Options) :- 
   var(Pred), !, 
   '$do_error'(instantiation_error,tabling_mode(Mod:Pred,Options)).
'$do_tabling_mode'(_,Mod:Pred,Options) :- !, 
   '$do_tabling_mode'(Mod,Pred,Options).
'$do_tabling_mode'(_,[],_) :- !.
'$do_tabling_mode'(Mod,[HPred|TPred],Options) :- !,
   '$do_tabling_mode'(Mod,HPred,Options),
   '$do_tabling_mode'(Mod,TPred,Options).
'$do_tabling_mode'(Mod,(Pred1,Pred2),Options) :- !,
   '$do_tabling_mode'(Mod,Pred1,Options),
   '$do_tabling_mode'(Mod,Pred2,Options).
'$do_tabling_mode'(Mod,PredName/PredArity,Options) :- 
   atom(PredName), 
   integer(PredArity),
   functor(PredFunctor,PredName,PredArity),
   '$flags'(PredFunctor,Mod,Flags,Flags), !,
   (Flags /\ 0x000040 =\= 0, !, '$set_tabling_mode'(Mod,PredFunctor,Options)
   ;
   '$do_error'(domain_error(table,Mod:PredName/PredArity),tabling_mode(Mod:PredName/PredArity,Options))).
'$do_tabling_mode'(Mod,Pred,Options) :- 
   '$do_error'(type_error(callable,Mod:Pred),tabling_mode(Mod:Pred,Options)).

'$set_tabling_mode'(Mod,PredFunctor,Options) :-
   var(Options), !,
   '$c_tabling_mode'(Mod,PredFunctor,Options).
'$set_tabling_mode'(_,_,[]) :- !.
'$set_tabling_mode'(Mod,PredFunctor,[HOption|TOption]) :- !,
   '$set_tabling_mode'(Mod,PredFunctor,HOption),
   '$set_tabling_mode'(Mod,PredFunctor,TOption).
'$set_tabling_mode'(Mod,PredFunctor,(Option1,Option2)) :- !,
   '$set_tabling_mode'(Mod,PredFunctor,Option1),
   '$set_tabling_mode'(Mod,PredFunctor,Option2).
'$set_tabling_mode'(Mod,PredFunctor,Option) :- 
   (Option = batched ; Option = local ; Option = exec_answers ; Option = load_answers), !, 
   '$c_tabling_mode'(Mod,PredFunctor,Option).
'$set_tabling_mode'(Mod,PredFunctor,Options) :- 
   functor(PredFunctor,PredName,PredArity), 
   '$do_error'(domain_error(flag_value,tabling_mode+Options),tabling_mode(Mod:PredName/PredArity,Options)).



/**************************
*     abolish_table/1     *
**************************/

abolish_table(Pred) :-
   '$current_module'(Mod),
   '$do_abolish_table'(Mod,Pred).

'$do_abolish_table'(Mod,Pred) :-
   var(Pred), !,
   '$do_error'(instantiation_error,abolish_table(Mod:Pred)).
'$do_abolish_table'(_,Mod:Pred) :- !,
   '$do_abolish_table'(Mod,Pred).
'$do_abolish_table'(_,[]) :- !.
'$do_abolish_table'(Mod,[HPred|TPred]) :- !,
   '$do_abolish_table'(Mod,HPred),
   '$do_abolish_table'(Mod,TPred).
'$do_abolish_table'(Mod,(Pred1,Pred2)) :- !,
   '$do_abolish_table'(Mod,Pred1),
   '$do_abolish_table'(Mod,Pred2).
'$do_abolish_table'(Mod,PredName/PredArity) :- 
   atom(PredName), 
   integer(PredArity),
   functor(PredFunctor,PredName,PredArity),
   '$flags'(PredFunctor,Mod,Flags,Flags), !,
   (Flags /\ 0x000040 =\= 0, !, '$c_abolish_table'(Mod,PredFunctor)
   ;
   '$do_error'(domain_error(table,Mod:PredName/PredArity),abolish_table(Mod:PredName/PredArity))).
'$do_abolish_table'(Mod,Pred) :-
   '$do_error'(type_error(callable,Mod:Pred),abolish_table(Mod:Pred)).



/***********************
*     show_table/1     *
***********************/

show_table(Pred) :-
   '$current_module'(Mod),
   '$do_show_table'(Mod,Pred).

'$do_show_table'(Mod,Pred) :-
   var(Pred), !,
   '$do_error'(instantiation_error,show_table(Mod:Pred)).
'$do_show_table'(_,Mod:Pred) :- !,
   '$do_show_table'(Mod,Pred).
'$do_show_table'(_,[]) :- !.
'$do_show_table'(Mod,[HPred|TPred]) :- !,
   '$do_show_table'(Mod,HPred),
   '$do_show_table'(Mod,TPred).
'$do_show_table'(Mod,(Pred1,Pred2)) :- !,
   '$do_show_table'(Mod,Pred1),
   '$do_show_table'(Mod,Pred2).
'$do_show_table'(Mod,PredName/PredArity) :- 
   atom(PredName), 
   integer(PredArity),
   functor(PredFunctor,PredName,PredArity),
   '$flags'(PredFunctor,Mod,Flags,Flags), !,
   (Flags /\ 0x000040 =\= 0, !, '$c_show_table'(Mod,PredFunctor)
   ;
   '$do_error'(domain_error(table,Mod:PredName/PredArity),show_table(Mod:PredName/PredArity))).
'$do_show_table'(Mod,Pred) :-
   '$do_error'(type_error(callable,Mod:Pred),show_table(Mod:Pred)).



/*****************************
*     table_statistics/1     *
*****************************/

table_statistics(Pred) :-
   '$current_module'(Mod),
   '$do_table_statistics'(Mod,Pred).

'$do_table_statistics'(Mod,Pred) :-
   var(Pred), !,
   '$do_error'(instantiation_error,table_statistics(Mod:Pred)).
'$do_table_statistics'(_,Mod:Pred) :- !,
   '$do_table_statistics'(Mod,Pred).
'$do_table_statistics'(_,[]) :- !.
'$do_table_statistics'(Mod,[HPred|TPred]) :- !,
   '$do_table_statistics'(Mod,HPred),
   '$do_table_statistics'(Mod,TPred).
'$do_table_statistics'(Mod,(Pred1,Pred2)) :- !,
   '$do_table_statistics'(Mod,Pred1),
   '$do_table_statistics'(Mod,Pred2).
'$do_table_statistics'(Mod,PredName/PredArity) :- 
   atom(PredName), 
   integer(PredArity),
   functor(PredFunctor,PredName,PredArity),
   '$flags'(PredFunctor,Mod,Flags,Flags), !,
   (Flags /\ 0x000040 =\= 0, !, '$c_table_statistics'(Mod,PredFunctor)
   ;
   '$do_error'(domain_error(table,Mod:PredName/PredArity),table_statistics(Mod:PredName/PredArity))).
'$do_table_statistics'(Mod,Pred) :-
   '$do_error'(type_error(callable,Mod:Pred),table_statistics(Mod:Pred)).