mirror of
https://github.com/kanaka/mal.git
synced 2024-09-20 01:57:09 +03:00
47 lines
1.3 KiB
Prolog
47 lines
1.3 KiB
Prolog
% -*- mode: prolog; -*- select prolog mode in the emacs text editor
|
|
|
|
% Convenient shortcuts, especially during steps 1 to 6.
|
|
|
|
% Similar to "assert", but raise an non-fatal error.
|
|
check(Condition, _, _) :- call(Condition), !.
|
|
check(_, Format, Arguments) :- throwf(Format, Arguments).
|
|
|
|
throwf(Format, Arguments) :-
|
|
format(string(Message), Format, Arguments),
|
|
throw(mal_error(Message)).
|
|
|
|
% Convenient shortcut: unbox(+Sequence, -List).
|
|
|
|
unbox_seq(Sequence, Forms) :- list(Forms, Sequence).
|
|
unbox_seq(Sequence, Forms) :- vector(Forms, Sequence).
|
|
|
|
% Abstract some loops.
|
|
|
|
% foldr(Goal, Vn, [X1, X2,...,Xn], V0) :-
|
|
% Goal(Xn, Vn, Vn-1),
|
|
% ...
|
|
% Goal(X2, V2, V1),
|
|
% Goal(X1, V1, V0),
|
|
foldr(_, Vn, [], Vn).
|
|
foldr(Goal, Vn, [X|Xs], V0) :-
|
|
foldr(Goal, Vn, Xs, V1),
|
|
call(Goal, X, V1, V0).
|
|
|
|
% foldl_keyvals(Goal, Init, [K1, V1, K2, V2, K3, V3], Acc3) :-
|
|
% Goal(Init, K1, V1, Acc1),
|
|
% Goal(Acc1, K2, V2, Acc2),
|
|
% Goal(Acc2, K3, V3, Acc3).
|
|
foldl_keyvals(_, Init, [], Init).
|
|
foldl_keyvals(Goal, Init, [K, V | KVs], Res) :-
|
|
call(Goal, Init, K, V, Acc),
|
|
foldl_keyvals(Goal, Acc, KVs, Res).
|
|
|
|
% map_keyvals(Goal, [K1, V1, K2, V2, K3, V3]) :-
|
|
% Goal(K1, V1),
|
|
% Goal(K2, V2),
|
|
% Goal(K3, V3).
|
|
map_keyvals(_, []).
|
|
map_keyvals(Goal, [K, V | KVs]) :-
|
|
call(Goal, K, V),
|
|
map_keyvals(Goal, KVs).
|