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yap-6.3/library/atts.yap
vsc b881f59a71 fix small bug in attvar handling. 
git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@1498 b08c6af1-5177-4d33-ba66-4b1c6b8b522a
2006-01-08 03:12:02 +00:00

246 lines
7.2 KiB
Prolog
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/*************************************************************************
* *
* 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.
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) :-
get_all_swi_atts(AttVar,SWIAtts),
modules_with_attributes(AttVar,Mods0),
modules_with_attributes(Mods),
find_used(Mods,Mods0,[],ModsI),
do_verify_attributes(ModsI, AttVar, Binding, Goals),
bind_attvar(AttVar),
do_hook_attributes(SWIAtts, Binding),
lcall(Goals).
find_used([],_,L,L).
find_used([M|Mods],Mods0,L0,Lf) :-
in(M,Mods0), !,
find_used(Mods,Mods0,[M|L0],Lf).
find_used([M|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).
do_hook_attributes([], _).
do_hook_attributes(att(Mod,Att,Atts), Binding) :-
current_predicate(attr_unify_hook,Mod:attr_unify_hook(_,_)),
!,
Mod:attr_unify_hook(Att, Binding),
do_hook_attributes(Atts, Binding).
do_hook_attributes(att(_,_,Atts), Binding) :-
do_hook_attributes(Atts, Binding).
lcall([]).
lcall([Mod:Gls|Goals]) :-
lcall2(Gls,Mod),
lcall(Goals).
lcall2([], _).
lcall2([Goal|Goals], Mod) :-
call(Mod:Goal),
lcall2(Goals, Mod).
convert_att_var(V, Gs) :-
modules_with_attributes(V,LMods),
fetch_att_goals(LMods,V,Gs0), !,
simplify_trues(Gs0, Gs).
convert_att_var(_, true).
fetch_att_goals([Mod], Att, G1) :-
call_module_attributes(Mod, Att, G1), !.
fetch_att_goals([_], _, true) :- !.
fetch_att_goals([Mod|LMods], Att, (G1,LGoal)) :-
call_module_attributes(Mod, Att, G1), !,
fetch_att_goals(LMods, Att, LGoal).
fetch_att_goals([_|LMods], Att, LGoal) :-
fetch_att_goals(LMods, Att, LGoal).
%
% if there is an active attribute for this module call attribute_goal.
%
call_module_attributes(Mod, AttV, G1) :-
current_predicate(attribute_goal, Mod:attribute_goal(AttV,G1)),
Mod:attribute_goal(AttV, G1).
simplify_trues((A,B), NG) :- !,
simplify_trues(A, NA),
simplify_trues(B, NB),
simplify_true(NA, NB, NG).
simplify_trues(G, G).
simplify_true(true, G, G) :- !.
simplify_true(G, true, G) :- !.
simplify_true(A, B, (A,B)).
convert_to_goals([G],G) :- !.
convert_to_goals([A|G],(A,Gs)) :-
convert_to_goals(G,Gs).
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