193 lines
6.1 KiB
Prolog
193 lines
6.1 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: atts.yap *
|
|
* Last rev: 8/2/88 *
|
|
* mods: *
|
|
* comments: attribute support for Prolog *
|
|
* *
|
|
*************************************************************************/
|
|
|
|
:- module(attributes, [op(1150, fx, attribute)]).
|
|
|
|
:- multifile
|
|
user:goal_expansion/3.
|
|
:- multifile
|
|
user:term_expansion/2.
|
|
|
|
:- dynamic existing_attribute/4.
|
|
:- dynamic modules_with_attributes/1.
|
|
:- dynamic attributed_module/3.
|
|
|
|
modules_with_attributes([prolog]).
|
|
|
|
%
|
|
% defining a new attribute is just a question of establishing a
|
|
% Functor, Mod -> INT mappings
|
|
%
|
|
new_attribute(V) :- var(V), !,
|
|
throw(error(instantiation_error,attribute(V))).
|
|
new_attribute((At1,At2)) :-
|
|
new_attribute(At1),
|
|
new_attribute(At2).
|
|
new_attribute(Na/Ar) :-
|
|
source_module(Mod),
|
|
functor(S,Na,Ar),
|
|
existing_attribute(S,Mod,_,_) , !.
|
|
new_attribute(Na/Ar) :-
|
|
source_module(Mod),
|
|
functor(S,Na,Ar),
|
|
store_new_module(Mod,Ar,Position),
|
|
assertz(existing_attribute(S,Mod,Ar,Position)).
|
|
|
|
existing_attribute(delay(_),prolog,1,2).
|
|
|
|
store_new_module(Mod,Ar,ArgPosition) :-
|
|
(
|
|
retract(attributed_module(Mod,Position,_))
|
|
->
|
|
true
|
|
;
|
|
retract(modules_with_attributes(Mods)),
|
|
assert(modules_with_attributes([Mod|Mods])), Position = 1
|
|
),
|
|
ArgPosition is Position+1,
|
|
( Ar == 0 -> NOfAtts is Position+1 ; NOfAtts is Position+Ar),
|
|
functor(AccessTerm,Mod,NOfAtts),
|
|
assertz(attributed_module(Mod,NOfAtts,AccessTerm)).
|
|
|
|
:- user_defined_directive(attribute(G), attributes:new_attribute(G)).
|
|
|
|
user:goal_expansion(get_atts(Var,AccessSpec), Mod, Goal) :-
|
|
expand_get_attributes(AccessSpec,Mod,Var,Goal).
|
|
user:goal_expansion(put_atts(Var,AccessSpec), Mod, Goal) :-
|
|
expand_put_attributes(AccessSpec, Mod, Var, Goal).
|
|
|
|
|
|
expand_get_attributes(V,_,_,_) :- var(V), !, fail.
|
|
expand_get_attributes([],_,_,true) :- !.
|
|
expand_get_attributes([-G1],Mod,V,attributes:free_att(V,Mod,Pos)) :-
|
|
existing_attribute(G1,Mod,_,Pos), !.
|
|
expand_get_attributes([+G1],Mod,V,attributes:get_att(V,Mod,Pos,A)) :-
|
|
existing_attribute(G1,Mod,1,Pos), !,
|
|
arg(1,G1,A).
|
|
expand_get_attributes([G1],Mod,V,attributes:get_att(V,Mod,Pos,A)) :-
|
|
existing_attribute(G1,Mod,1,Pos), !,
|
|
arg(1,G1,A).
|
|
expand_get_attributes(Atts,Mod,Var,attributes:get_module_atts(Var,AccessTerm)) :- Atts = [_|_], !,
|
|
attributed_module(Mod,NOfAtts,AccessTerm),
|
|
void_term(Void),
|
|
cvt_atts(Atts,Mod,Void,LAtts),
|
|
sort(LAtts,SortedLAtts),
|
|
free_term(Free),
|
|
build_att_term(1,NOfAtts,SortedLAtts,Free,AccessTerm).
|
|
expand_get_attributes(Att,Mod,Var,Goal) :-
|
|
expand_get_attributes([Att],Mod,Var,Goal).
|
|
|
|
build_att_term(NOfAtts,NOfAtts,[],_,_) :- !.
|
|
build_att_term(I0,NOfAtts,[I-Info|SortedLAtts],Void,AccessTerm) :-
|
|
I is I0+1, !,
|
|
copy_att_args(Info,I0,NI,AccessTerm),
|
|
build_att_term(NI,NOfAtts,SortedLAtts,Void,AccessTerm).
|
|
build_att_term(I0,NOfAtts,SortedLAtts,Void,AccessTerm) :-
|
|
I is I0+1,
|
|
arg(I,AccessTerm,Void),
|
|
build_att_term(I,NOfAtts,SortedLAtts,Void,AccessTerm).
|
|
|
|
cvt_atts(V,_,_,_) :- var(V), !, fail.
|
|
cvt_atts([],_,_,[]).
|
|
cvt_atts([V|_],_,_,_) :- var(V), !, fail.
|
|
cvt_atts([+Att|Atts],Mod,Void,[Pos-LAtts|Read]) :- !,
|
|
existing_attribute(Att,Mod,_,Pos),
|
|
(atom(Att) -> LAtts = [_] ; Att=..[_|LAtts]),
|
|
cvt_atts(Atts,Mod,Void,Read).
|
|
cvt_atts([-Att|Atts],Mod,Void,[Pos-LVoids|Read]) :- !,
|
|
existing_attribute(Att,Mod,_,Pos),
|
|
(
|
|
atom(Att)
|
|
->
|
|
LVoids = [Void]
|
|
;
|
|
Att =..[_|LAtts],
|
|
void_vars(LAtts,Void,LVoids)
|
|
),
|
|
cvt_atts(Atts,Mod,Void,Read).
|
|
cvt_atts([Att|Atts],Mod,Void,[Pos-LAtts|Read]) :- !,
|
|
existing_attribute(Att,Mod,_,Pos),
|
|
(atom(Att) -> LAtts = [_] ; Att=..[_|LAtts]),
|
|
cvt_atts(Atts,Mod,Void,Read).
|
|
|
|
copy_att_args([],I,I,_).
|
|
copy_att_args([V|Info],I,NI,AccessTerm) :-
|
|
I1 is I+1,
|
|
arg(I1,AccessTerm,V),
|
|
copy_att_args(Info,I1,NI,AccessTerm).
|
|
|
|
void_vars([],_,[]).
|
|
void_vars([_|LAtts],Void,[Void|LVoids]) :-
|
|
void_vars(LAtts,Void,LVoids).
|
|
|
|
expand_put_attributes(V,_,_,_) :- var(V), !, fail.
|
|
expand_put_attributes([-G1],Mod,V,attributes:rm_att(V,Mod,NOfAtts,Pos)) :-
|
|
existing_attribute(G1,Mod,_,Pos), !,
|
|
attributed_module(Mod,NOfAtts,_).
|
|
expand_put_attributes([+G1],Mod,V,attributes:put_att(V,Mod,NOfAtts,Pos,A)) :-
|
|
existing_attribute(G1,Mod,1,Pos), !,
|
|
attributed_module(Mod,NOfAtts,_),
|
|
arg(1,G1,A).
|
|
expand_put_attributes([G1],Mod,V,attributes:put_att(V,Mod,NOfAtts,Pos,A)) :-
|
|
existing_attribute(G1,Mod,1,Pos), !,
|
|
attributed_module(Mod,NOfAtts,_),
|
|
arg(1,G1,A).
|
|
expand_put_attributes(Atts,Mod,Var,attributes:put_module_atts(Var,AccessTerm)) :- Atts = [_|_], !,
|
|
attributed_module(Mod,NOfAtts,AccessTerm),
|
|
void_term(Void),
|
|
cvt_atts(Atts,Mod,Void,LAtts),
|
|
sort(LAtts,SortedLAtts),
|
|
free_term(Free),
|
|
build_att_term(1,NOfAtts,SortedLAtts,Free,AccessTerm).
|
|
expand_put_attributes(Att,Mod,Var,Goal) :-
|
|
expand_put_attributes([Att],Mod,Var,Goal).
|
|
|
|
woken_att_do(AttVar, Binding, NGoals, DoNotBind) :-
|
|
modules_with_attributes(AttVar,Mods0),
|
|
modules_with_attributes(Mods),
|
|
find_used(Mods,Mods0,[],ModsI),
|
|
do_verify_attributes(ModsI, AttVar, Binding, Goals),
|
|
process_goals(Goals, NGoals, DoNotBind).
|
|
|
|
% dirty trick to be able to unbind a variable that has been constrained.
|
|
process_goals([], [], _).
|
|
process_goals((M:do_not_bind_variable(Gs)).Goals, (M:Gs).NGoals, true) :- !,
|
|
process_goals(Goals, NGoals, _).
|
|
process_goals(G.Goals, G.NGoals, Do) :-
|
|
process_goals(Goals, NGoals, Do).
|
|
|
|
find_used([],_,L,L).
|
|
find_used([M|Mods],Mods0,L0,Lf) :-
|
|
in(M,Mods0), !,
|
|
find_used(Mods,Mods0,[M|L0],Lf).
|
|
find_used([_|Mods],Mods0,L0,Lf) :-
|
|
find_used(Mods,Mods0,L0,Lf).
|
|
|
|
in(X,[X|_]).
|
|
in(X,[_|L]) :-
|
|
in(X,L).
|
|
|
|
do_verify_attributes([], _, _, []).
|
|
do_verify_attributes([Mod|Mods], AttVar, Binding, [Mod:Goal|Goals]) :-
|
|
current_predicate(verify_attributes,Mod:verify_attributes(_,_,_)), !,
|
|
Mod:verify_attributes(AttVar, Binding, Goal),
|
|
do_verify_attributes(Mods, AttVar, Binding, Goals).
|
|
do_verify_attributes([_|Mods], AttVar, Binding, Goals) :-
|
|
do_verify_attributes(Mods, AttVar, Binding, Goals).
|
|
|
|
|
|
|