de3bd15889
git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@1389 b08c6af1-5177-4d33-ba66-4b1c6b8b522a
62 lines
1.8 KiB
Prolog
62 lines
1.8 KiB
Prolog
:- module(clpbn_utils, [
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clpbn_not_var_member/2,
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clpbn_var_member/2,
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check_for_hidden_vars/3,
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sort_vars_by_key/3,
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sort_vars_by_key_and_parents/4]).
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%
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% It may happen that variables from a previous query may still be around.
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% and be used in the next evaluation, so we cannot trust the list of *new*
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% variables.
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%
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check_for_hidden_vars([], _, []).
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check_for_hidden_vars([V|Vs], AllVs0, [V|NVs]) :-
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check_for_extra_variables(V,AllVs0, AllVs, Vs, IVs),
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check_for_hidden_vars(IVs, AllVs, NVs).
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check_for_extra_variables(V,AllVs0, AllVs, Vs, IVs) :-
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var(V),
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clpbn:get_atts(V, [dist(_,_,[V1|LV])]), !,
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add_old_variables([V1|LV], AllVs0, AllVs, Vs, IVs).
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check_for_extra_variables(_,AllVs, AllVs, Vs, Vs).
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add_old_variables([], AllVs, AllVs, Vs, Vs).
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add_old_variables([V1|LV], AllVs0, AllVs, Vs, IVs) :-
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clpbn_not_var_member(AllVs0, V1), !,
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add_old_variables(LV, [V1|AllVs0], AllVs, [V1|Vs], IVs).
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add_old_variables([_|LV], AllVs0, AllVs, Vs, IVs) :-
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add_old_variables(LV, AllVs0, AllVs, Vs, IVs).
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clpbn_var_member([V1|_], V) :- V1 == V, !.
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clpbn_var_member([_|Vs], V) :-
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clpbn_var_member(Vs, V).
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clpbn_not_var_member([], _).
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clpbn_not_var_member([V1|Vs], V) :- V1 \== V,
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clpbn_not_var_member(Vs, V).
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sort_vars_by_key(AVars, SortedAVars, Keys) :-
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get_keys(AVars, KeysVars),
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keysort(KeysVars, KVars),
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merge_same_key(KVars, SortedAVars, Keys).
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get_keys([], []).
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get_keys([V|AVars], [K-V|KeysVars]) :-
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clpbn:get_atts(V, [key(K)]), !,
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get_keys(AVars, KeysVars).
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get_keys([_|AVars], KeysVars) :- % may be non-CLPBN vars.
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get_keys(AVars, KeysVars).
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merge_same_key([], [], []).
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merge_same_key([K1-V1|KVs], [V1|Vs], [K1|Ks]) :-
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eat_same_key(KVs,K1,V1,RKVs),
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merge_same_key(RKVs, Vs, Ks).
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eat_same_key([K-V|KVs],K,V,RKVs) :- !,
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eat_same_key(KVs,K,V,RKVs).
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eat_same_key(KVs,_,_,KVs).
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