79 lines
1.3 KiB
Perl
79 lines
1.3 KiB
Perl
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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%% _ _ _ _
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%% _ __ __ _(_)_ __| (_)___| |_
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%% | '_ \ / _` | | '__| | / __| __|
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%% | |_) | (_| | | | | | \__ \ |_
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%% | .__/ \__,_|_|_| |_|_|___/\__|
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%% |_|
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%%
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%% * author: Tom Schrijvers
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:- module(pairlist,[
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fst_of_pairs/2,
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lookup/3,
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lookup_any/3,
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lookup_eq/3,
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lookup_any_eq/3,
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pairup/3,
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snd_of_pairs/2,
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translate/3,
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pairlist_delete_eq/3
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]).
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fst_of_pairs([],[]).
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fst_of_pairs([X-_|XYs],[X|Xs]) :-
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fst_of_pairs(XYs,Xs).
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snd_of_pairs([],[]).
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snd_of_pairs([_-Y|XYs],[Y|Ys]) :-
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snd_of_pairs(XYs,Ys).
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pairup([],[],[]).
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pairup([X|Xs],[Y|Ys],[X-Y|XYs]) :-
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pairup(Xs,Ys,XYs).
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lookup([K - V | KVs],Key,Value) :-
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( K = Key ->
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V = Value
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;
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lookup(KVs,Key,Value)
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).
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lookup_any([K - V | KVs],Key,Value) :-
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(
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K = Key,
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V = Value
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;
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lookup_any(KVs,Key,Value)
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).
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lookup_eq([K - V | KVs],Key,Value) :-
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( K == Key ->
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V = Value
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;
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lookup_eq(KVs,Key,Value)
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).
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lookup_any_eq([K - V | KVs],Key,Value) :-
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(
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K == Key,
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V = Value
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;
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lookup_any_eq(KVs,Key,Value)
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).
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translate([],_,[]).
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translate([X|Xs],Dict,[Y|Ys]) :-
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lookup_eq(Dict,X,Y),
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translate(Xs,Dict,Ys).
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pairlist_delete_eq([], _, []).
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pairlist_delete_eq([K - V| KVs], Key, PL) :-
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( Key == K ->
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PL = KVs
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;
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PL = [ K - V | T ],
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pairlist_delete_eq(KVs, Key, T)
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).
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