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yap-6.3/packages/chr/chr_compiler_utility.pl

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2015-10-13 08:17:51 +01:00
/* $Id$
Part of CHR (Constraint Handling Rules)
Author: Tom Schrijvers
E-mail: Tom.Schrijvers@cs.kuleuven.be
WWW: http://www.swi-prolog.org
Copyright (C): 2005-2006, K.U. Leuven
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
As a special exception, if you link this library with other files,
compiled with a Free Software compiler, to produce an executable, this
library does not by itself cause the resulting executable to be covered
by the GNU General Public License. This exception does not however
invalidate any other reasons why the executable file might be covered by
the GNU General Public License.
*/
%% @addtogroup CHR_in_YAP_Programs
%
% CHR compilation utilitities
%
:- module(chr_compiler_utility,
[ time/2
, replicate/3
, pair_all_with/3
, conj2list/2
, list2conj/2
, disj2list/2
, list2disj/2
, variable_replacement/3
, variable_replacement/4
, identical_rules/2
, identical_guarded_rules/2
, copy_with_variable_replacement/3
, my_term_copy/3
, my_term_copy/4
, atom_concat_list/2
, init/2
, member2/3
, select2/6
, set_elems/2
, instrument_goal/4
, sort_by_key/3
, arg1/3
, wrap_in_functor/3
, tree_set_empty/1
, tree_set_memberchk/2
, tree_set_add/3
, tree_set_merge/3
, fold1/3
, fold/4
, maplist_dcg//3
, maplist_dcg//4
]).
:- use_module(pairlist).
:- use_module(library(lists), [permutation/2]).
:- use_module(library(assoc)).
:- meta_predicate
fold1(3,+,-),
fold(+,3,+,-).
%% SICStus begin
%% use_module(library(terms),[term_variables/2]).
%% SICStus end
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% time(Phase,Goal) :-
% statistics(runtime,[T1|_]),
% call(Goal),
% statistics(runtime,[T2|_]),
% T is T2 - T1,
% format(' ~w ~46t ~D~80| ms\n',[Phase,T]),
% deterministic(Det),
% ( Det == true ->
% true
% ;
% format('\t\tNOT DETERMINISTIC!\n',[])
% ).
time(_,Goal) :- call(Goal).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
replicate(N,E,L) :-
( N =< 0 ->
L = []
;
L = [E|T],
M is N - 1,
replicate(M,E,T)
).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
pair_all_with([],_,[]).
pair_all_with([X|Xs],Y,[X-Y|Rest]) :-
pair_all_with(Xs,Y,Rest).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
conj2list(Conj,L) :- %% transform conjunctions to list
conj2list(Conj,L,[]).
conj2list(Var,L,T) :-
var(Var), !,
L = [Var|T].
conj2list(true,L,L) :- !.
conj2list(Conj,L,T) :-
Conj = (G1,G2), !,
conj2list(G1,L,T1),
conj2list(G2,T1,T).
conj2list(G,[G | T],T).
disj2list(Conj,L) :- %% transform disjunctions to list
disj2list(Conj,L,[]).
disj2list(Conj,L,T) :-
Conj = (fail;G2), !,
disj2list(G2,L,T).
disj2list(Conj,L,T) :-
Conj = (G1;G2), !,
disj2list(G1,L,T1),
disj2list(G2,T1,T).
disj2list(G,[G | T],T).
list2conj([],true).
list2conj([G],X) :- !, X = G.
list2conj([G|Gs],C) :-
( G == true -> %% remove some redundant trues
list2conj(Gs,C)
;
C = (G,R),
list2conj(Gs,R)
).
list2disj([],fail).
list2disj([G],X) :- !, X = G.
list2disj([G|Gs],C) :-
( G == fail -> %% remove some redundant fails
list2disj(Gs,C)
;
C = (G;R),
list2disj(Gs,R)
).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% check wether two rules are identical
identical_guarded_rules(rule(H11,H21,G1,_),rule(H12,H22,G2,_)) :-
G1 == G2,
permutation(H11,P1),
P1 == H12,
permutation(H21,P2),
P2 == H22.
identical_rules(rule(H11,H21,G1,B1),rule(H12,H22,G2,B2)) :-
G1 == G2,
identical_bodies(B1,B2),
permutation(H11,P1),
P1 == H12,
permutation(H21,P2),
P2 == H22.
identical_bodies(B1,B2) :-
( B1 = (X1 = Y1),
B2 = (X2 = Y2) ->
( X1 == X2,
Y1 == Y2
; X1 == Y2,
X2 == Y1
),
!
; B1 == B2
).
% replace variables in list
copy_with_variable_replacement(X,Y,L) :-
( var(X) ->
( lookup_eq(L,X,Y) ->
true
; X = Y
)
; functor(X,F,A),
functor(Y,F,A),
X =.. [_|XArgs],
Y =.. [_|YArgs],
copy_with_variable_replacement_l(XArgs,YArgs,L)
).
copy_with_variable_replacement_l([],[],_).
copy_with_variable_replacement_l([X|Xs],[Y|Ys],L) :-
copy_with_variable_replacement(X,Y,L),
copy_with_variable_replacement_l(Xs,Ys,L).
% build variable replacement list
variable_replacement(X,Y,L) :-
variable_replacement(X,Y,[],L).
variable_replacement(X,Y,L1,L2) :-
( var(X) ->
var(Y),
( lookup_eq(L1,X,Z) ->
Z == Y,
L2 = L1
; ( X == Y -> L2=L1 ; L2 = [X-Y,Y-X|L1])
)
; X =.. [F|XArgs],
nonvar(Y),
Y =.. [F|YArgs],
variable_replacement_l(XArgs,YArgs,L1,L2)
).
variable_replacement_l([],[],L,L).
variable_replacement_l([X|Xs],[Y|Ys],L1,L3) :-
variable_replacement(X,Y,L1,L2),
variable_replacement_l(Xs,Ys,L2,L3).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
my_term_copy(X,Dict,Y) :-
my_term_copy(X,Dict,_,Y).
my_term_copy(X,Dict1,Dict2,Y) :-
( var(X) ->
( lookup_eq(Dict1,X,Y) ->
Dict2 = Dict1
; Dict2 = [X-Y|Dict1]
)
; functor(X,XF,XA),
functor(Y,XF,XA),
X =.. [_|XArgs],
Y =.. [_|YArgs],
my_term_copy_list(XArgs,Dict1,Dict2,YArgs)
).
my_term_copy_list([],Dict,Dict,[]).
my_term_copy_list([X|Xs],Dict1,Dict3,[Y|Ys]) :-
my_term_copy(X,Dict1,Dict2,Y),
my_term_copy_list(Xs,Dict2,Dict3,Ys).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
atom_concat_list([X],X) :- ! .
atom_concat_list([X|Xs],A) :-
atom_concat_list(Xs,B),
atomic_concat(X,B,A).
set_elems([],_).
set_elems([X|Xs],X) :-
set_elems(Xs,X).
init([],[]).
init([_],[]) :- !.
init([X|Xs],[X|R]) :-
init(Xs,R).
member2([X|_],[Y|_],X-Y).
member2([_|Xs],[_|Ys],P) :-
member2(Xs,Ys,P).
select2(X, Y, [X|Xs], [Y|Ys], Xs, Ys).
select2(X, Y, [X1|Xs], [Y1|Ys], [X1|NXs], [Y1|NYs]) :-
select2(X, Y, Xs, Ys, NXs, NYs).
instrument_goal(Goal,Pre,Post,(Pre,Goal,Post)).
sort_by_key(List,Keys,SortedList) :-
pairup(Keys,List,Pairs),
sort(Pairs,SortedPairs),
once(pairup(_,SortedList,SortedPairs)).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
arg1(Term,Index,Arg) :- arg(Index,Term,Arg).
wrap_in_functor(Functor,X,Term) :-
Term =.. [Functor,X].
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
tree_set_empty(TreeSet) :- empty_assoc(TreeSet).
tree_set_memberchk(Element,TreeSet) :- get_assoc(Element,TreeSet,_).
tree_set_add(TreeSet,Element,NTreeSet) :- put_assoc(Element,TreeSet,x,NTreeSet).
tree_set_merge(TreeSet1,TreeSet2,TreeSet3) :-
assoc_to_list(TreeSet1,List),
fold(List,tree_set_add_pair,TreeSet2,TreeSet3).
tree_set_add_pair(Key-Value,TreeSet,NTreeSet) :-
put_assoc(Key,TreeSet,Value,NTreeSet).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
fold1(P,[Head|Tail],Result) :-
fold(Tail,P,Head,Result).
fold([],_,Acc,Acc).
fold([X|Xs],P,Acc,Res) :-
call(P,X,Acc,NAcc),
fold(Xs,P,NAcc,Res).
maplist_dcg(P,L1,L2,L) -->
maplist_dcg_(L1,L2,L,P).
maplist_dcg_([],[],[],_) --> [].
maplist_dcg_([X|Xs],[Y|Ys],[Z|Zs],P) -->
call(P,X,Y,Z),
maplist_dcg_(Xs,Ys,Zs,P).
maplist_dcg(P,L1,L2) -->
maplist_dcg_(L1,L2,P).
maplist_dcg_([],[],_) --> [].
maplist_dcg_([X|Xs],[Y|Ys],P) -->
call(P,X,Y),
maplist_dcg_(Xs,Ys,P).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
:- dynamic
user:goal_expansion/2.
:- multifile
user:goal_expansion/2.
user:goal_expansion(arg1(Term,Index,Arg), arg(Index,Term,Arg)).
user:goal_expansion(wrap_in_functor(Functor,In,Out), Goal) :-
( atom(Functor), var(Out) ->
Out =.. [Functor,In],
Goal = true
;
Goal = (Out =.. [Functor,In])
).