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gleam_stdlib
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retired
A standard library for the Gleam programming language
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Files
src/gleam@list.erl
-module(gleam@list).
-compile([no_auto_import, nowarn_unused_vars]).
-export([is_empty/1, first/1, rest/1, new/0, prepend/2, length/1, reverse/1, append/2, contains/2, map/2, fold/3, group/2, map_fold/3, reduce/2, last/1, filter/2, filter_map/2, index_map/2, try_map/2, drop/2, at/2, take/2, flatten/1, flat_map/2, fold_right/3, index_fold/3, try_fold/3, fold_until/3, find/2, find_map/2, key_find/2, all/2, any/2, zip/2, strict_zip/2, window_by_2/1, unzip/1, intersperse/2, unique/1, sort/2, range/2, repeat/2, split/2, split_while/2, pop/2, pop_map/2, key_pop/2, key_set/3, each/2, try_each/2, partition/2, permutations/1, window/2, drop_while/2, take_while/2, chunk/2, sized_chunk/2, scan/3, combinations/2, combination_pairs/1, transpose/1, interleave/1, shuffle/1]).
-export_type([length_mismatch/0, continue_or_stop/1]).
-type length_mismatch() :: length_mismatch.
-type continue_or_stop(SY) :: {continue, SY} | {stop, SY}.
-spec is_empty(list(any())) -> boolean().
is_empty(List) ->
List =:= [].
-spec first(list(TI)) -> {ok, TI} | {error, nil}.
first(List) ->
case List of
[] ->
{error, nil};
[X | _] ->
{ok, X}
end.
-spec rest(list(TM)) -> {ok, list(TM)} | {error, nil}.
rest(List) ->
case List of
[] ->
{error, nil};
[_ | Xs] ->
{ok, Xs}
end.
-spec new() -> list(any()).
new() ->
[].
-spec prepend(list(XH), XH) -> list(XH).
prepend(List, Item) ->
[Item | List].
-spec length(list(any())) -> integer().
length(List) ->
erlang:length(List).
-spec reverse(list(TB)) -> list(TB).
reverse(Xs) ->
lists:reverse(Xs).
-spec append(list(XD), list(XD)) -> list(XD).
append(First, Second) ->
lists:append(First, Second).
-spec contains(list(TG), TG) -> boolean().
contains(List, Elem) ->
case List of
[] ->
false;
[First | _] when First =:= Elem ->
true;
[_ | Rest] ->
contains(Rest, Elem)
end.
-spec do_map(list(VB), fun((VB) -> VD), list(VD)) -> list(VD).
do_map(List, Fun, Acc) ->
case List of
[] ->
reverse(Acc);
[X | Xs] ->
do_map(Xs, Fun, [Fun(X) | Acc])
end.
-spec map(list(VG), fun((VG) -> VI)) -> list(VI).
map(List, Fun) ->
do_map(List, Fun, []).
-spec update_group(fun((TR) -> TS)) -> fun((gleam@map:map_(TS, list(TR)), TR) -> gleam@map:map_(TS, list(TR))).
update_group(F) ->
fun(Groups, Elem) -> case gleam@map:get(Groups, F(Elem)) of
{ok, Existing} ->
gleam@map:insert(Groups, F(Elem), [Elem | Existing]);
{error, _} ->
gleam@map:insert(Groups, F(Elem), [Elem])
end end.
-spec fold(list(YC), YE, fun((YE, YC) -> YE)) -> YE.
fold(List, Initial, Fun) ->
case List of
[] ->
Initial;
[X | Rest] ->
fold(Rest, Fun(Initial, X), Fun)
end.
-spec group(list(TZ), fun((TZ) -> UB)) -> gleam@map:map_(UB, list(TZ)).
group(List, Key) ->
fold(List, gleam@map:new(), update_group(Key)).
-spec map_fold(list(VK), VM, fun((VM, VK) -> {VM, VN})) -> {VM, list(VN)}.
map_fold(List, Acc, Fun) ->
_pipe = fold(
List,
{Acc, []},
fun(Acc@1, Item) ->
{Current_acc, Items} = Acc@1,
{Next_acc, Next_item} = Fun(Current_acc, Item),
{Next_acc, [Next_item | Items]}
end
),
gleam@pair:map_second(_pipe, fun reverse/1).
-spec reduce(list(AHZ), fun((AHZ, AHZ) -> AHZ)) -> {ok, AHZ} | {error, nil}.
reduce(List, Fun) ->
case List of
[] ->
{error, nil};
[First | Rest] ->
{ok, fold(Rest, First, Fun)}
end.
-spec last(list(AIM)) -> {ok, AIM} | {error, nil}.
last(List) ->
_pipe = List,
reduce(_pipe, fun(_, Elem) -> Elem end).
-spec do_filter(list(UF), fun((UF) -> boolean()), list(UF)) -> list(UF).
do_filter(List, Fun, Acc) ->
case List of
[] ->
reverse(Acc);
[X | Xs] ->
New_acc = case Fun(X) of
true ->
[X | Acc];
false ->
Acc
end,
do_filter(Xs, Fun, New_acc)
end.
-spec filter(list(UJ), fun((UJ) -> boolean())) -> list(UJ).
filter(List, Predicate) ->
do_filter(List, Predicate, []).
-spec do_filter_map(list(UM), fun((UM) -> {ok, UO} | {error, any()}), list(UO)) -> list(UO).
do_filter_map(List, Fun, Acc) ->
case List of
[] ->
reverse(Acc);
[X | Xs] ->
New_acc = case Fun(X) of
{ok, X@1} ->
[X@1 | Acc];
{error, _} ->
Acc
end,
do_filter_map(Xs, Fun, New_acc)
end.
-spec filter_map(list(UU), fun((UU) -> {ok, UW} | {error, any()})) -> list(UW).
filter_map(List, Fun) ->
do_filter_map(List, Fun, []).
-spec do_index_map(list(VP), fun((integer(), VP) -> VR), integer(), list(VR)) -> list(VR).
do_index_map(List, Fun, Index, Acc) ->
case List of
[] ->
reverse(Acc);
[X | Xs] ->
Acc@1 = [Fun(Index, X) | Acc],
do_index_map(Xs, Fun, Index + 1, Acc@1)
end.
-spec index_map(list(VU), fun((integer(), VU) -> VW)) -> list(VW).
index_map(List, Fun) ->
do_index_map(List, Fun, 0, []).
-spec do_try_map(list(VY), fun((VY) -> {ok, WA} | {error, WB}), list(WA)) -> {ok,
list(WA)} |
{error, WB}.
do_try_map(List, Fun, Acc) ->
case List of
[] ->
{ok, reverse(Acc)};
[X | Xs] ->
case Fun(X) of
{ok, Y} ->
do_try_map(Xs, Fun, [Y | Acc]);
{error, Error} ->
{error, Error}
end
end.
-spec try_map(list(WI), fun((WI) -> {ok, WK} | {error, WL})) -> {ok, list(WK)} |
{error, WL}.
try_map(List, Fun) ->
do_try_map(List, Fun, []).
-spec drop(list(WR), integer()) -> list(WR).
drop(List, N) ->
case N =< 0 of
true ->
List;
false ->
case List of
[] ->
[];
[_ | Xs] ->
drop(Xs, N - 1)
end
end.
-spec at(list(ABY), integer()) -> {ok, ABY} | {error, nil}.
at(List, Index) ->
case Index >= 0 of
true ->
_pipe = List,
_pipe@1 = drop(_pipe, Index),
first(_pipe@1);
false ->
{error, nil}
end.
-spec do_take(list(WU), integer(), list(WU)) -> list(WU).
do_take(List, N, Acc) ->
case N =< 0 of
true ->
reverse(Acc);
false ->
case List of
[] ->
reverse(Acc);
[X | Xs] ->
do_take(Xs, N - 1, [X | Acc])
end
end.
-spec take(list(WY), integer()) -> list(WY).
take(List, N) ->
do_take(List, N, []).
-spec reverse_and_prepend(list(XK), list(XK)) -> list(XK).
reverse_and_prepend(Prefix, Suffix) ->
case Prefix of
[] ->
Suffix;
[First | Rest] ->
reverse_and_prepend(Rest, [First | Suffix])
end.
-spec do_flatten(list(list(XO)), list(XO)) -> list(XO).
do_flatten(Lists, Acc) ->
case Lists of
[] ->
reverse(Acc);
[List | Further_lists] ->
do_flatten(Further_lists, reverse_and_prepend(List, Acc))
end.
-spec flatten(list(list(XT))) -> list(XT).
flatten(Lists) ->
do_flatten(Lists, []).
-spec flat_map(list(XX), fun((XX) -> list(XZ))) -> list(XZ).
flat_map(List, Fun) ->
_pipe = map(List, Fun),
flatten(_pipe).
-spec fold_right(list(YF), YH, fun((YH, YF) -> YH)) -> YH.
fold_right(List, Initial, Fun) ->
case List of
[] ->
Initial;
[X | Rest] ->
Fun(fold_right(Rest, Initial, Fun), X)
end.
-spec do_index_fold(list(YI), YK, fun((YK, YI, integer()) -> YK), integer()) -> YK.
do_index_fold(Over, Acc, With, Index) ->
case Over of
[] ->
Acc;
[First | Rest] ->
do_index_fold(Rest, With(Acc, First, Index), With, Index + 1)
end.
-spec index_fold(list(YL), YN, fun((YN, YL, integer()) -> YN)) -> YN.
index_fold(Over, Initial, Fun) ->
do_index_fold(Over, Initial, Fun, 0).
-spec try_fold(list(YO), YQ, fun((YQ, YO) -> {ok, YQ} | {error, YR})) -> {ok,
YQ} |
{error, YR}.
try_fold(Collection, Accumulator, Fun) ->
case Collection of
[] ->
{ok, Accumulator};
[First | Rest] ->
case Fun(Accumulator, First) of
{ok, Result} ->
try_fold(Rest, Result, Fun);
{error, _} = Error ->
Error
end
end.
-spec fold_until(list(YW), YY, fun((YY, YW) -> continue_or_stop(YY))) -> YY.
fold_until(Collection, Accumulator, Fun) ->
case Collection of
[] ->
Accumulator;
[First | Rest] ->
case Fun(Accumulator, First) of
{continue, Next_accumulator} ->
fold_until(Rest, Next_accumulator, Fun);
{stop, B} ->
B
end
end.
-spec find(list(AAA), fun((AAA) -> boolean())) -> {ok, AAA} | {error, nil}.
find(Haystack, Is_desired) ->
case Haystack of
[] ->
{error, nil};
[X | Rest] ->
case Is_desired(X) of
true ->
{ok, X};
_ ->
find(Rest, Is_desired)
end
end.
-spec find_map(list(AAE), fun((AAE) -> {ok, AAG} | {error, any()})) -> {ok, AAG} |
{error, nil}.
find_map(Haystack, Fun) ->
case Haystack of
[] ->
{error, nil};
[X | Rest] ->
case Fun(X) of
{ok, X@1} ->
{ok, X@1};
_ ->
find_map(Rest, Fun)
end
end.
-spec key_find(list({ADV, ADW}), ADV) -> {ok, ADW} | {error, nil}.
key_find(Keyword_list, Desired_key) ->
find_map(
Keyword_list,
fun(Keyword) ->
{Key, Value} = Keyword,
case Key =:= Desired_key of
true ->
{ok, Value};
false ->
{error, nil}
end
end
).
-spec all(list(AAM), fun((AAM) -> boolean())) -> boolean().
all(List, Predicate) ->
case List of
[] ->
true;
[First | Rest] ->
case Predicate(First) of
true ->
all(Rest, Predicate);
false ->
false
end
end.
-spec any(list(AAO), fun((AAO) -> boolean())) -> boolean().
any(List, Predicate) ->
case List of
[] ->
false;
[First | Rest] ->
case Predicate(First) of
true ->
true;
false ->
any(Rest, Predicate)
end
end.
-spec do_zip(list(AAQ), list(AAS), list({AAQ, AAS})) -> list({AAQ, AAS}).
do_zip(Xs, Ys, Acc) ->
case {Xs, Ys} of
{[X | Xs@1], [Y | Ys@1]} ->
do_zip(Xs@1, Ys@1, [{X, Y} | Acc]);
{_, _} ->
reverse(Acc)
end.
-spec zip(list(AAW), list(AAY)) -> list({AAW, AAY}).
zip(List, Other) ->
do_zip(List, Other, []).
-spec strict_zip(list(ABB), list(ABD)) -> {ok, list({ABB, ABD})} |
{error, length_mismatch()}.
strict_zip(List, Other) ->
case length(List) =:= length(Other) of
true ->
{ok, zip(List, Other)};
false ->
{error, length_mismatch}
end.
-spec window_by_2(list(AGO)) -> list({AGO, AGO}).
window_by_2(L) ->
zip(L, drop(L, 1)).
-spec do_unzip(list({ABM, ABN}), list(ABM), list(ABN)) -> {list(ABM), list(ABN)}.
do_unzip(Input, Xs, Ys) ->
case Input of
[] ->
{reverse(Xs), reverse(Ys)};
[{X, Y} | Rest] ->
do_unzip(Rest, [X | Xs], [Y | Ys])
end.
-spec unzip(list({ABM, ABN})) -> {list(ABM), list(ABN)}.
unzip(Input) ->
do_unzip(Input, [], []).
-spec do_intersperse(list(ABR), ABR, list(ABR)) -> list(ABR).
do_intersperse(List, Separator, Acc) ->
case List of
[] ->
reverse(Acc);
[X | Rest] ->
do_intersperse(Rest, Separator, [X, Separator | Acc])
end.
-spec intersperse(list(ABV), ABV) -> list(ABV).
intersperse(List, Elem) ->
case List of
[] ->
List;
[_] ->
List;
[X | Rest] ->
do_intersperse(Rest, Elem, [X])
end.
-spec unique(list(ACC)) -> list(ACC).
unique(List) ->
case List of
[] ->
[];
[X | Rest] ->
[X | unique(filter(Rest, fun(Y) -> Y /= X end))]
end.
-spec merge_up(
integer(),
integer(),
list(ACF),
list(ACF),
list(ACF),
fun((ACF, ACF) -> gleam@order:order())
) -> list(ACF).
merge_up(Na, Nb, A, B, Acc, Compare) ->
case {Na, Nb, A, B} of
{0, 0, _, _} ->
Acc;
{_, 0, [Ax | Ar], _} ->
merge_up(Na - 1, Nb, Ar, B, [Ax | Acc], Compare);
{0, _, _, [Bx | Br]} ->
merge_up(Na, Nb - 1, A, Br, [Bx | Acc], Compare);
{_, _, [Ax@1 | Ar@1], [Bx@1 | Br@1]} ->
case Compare(Ax@1, Bx@1) of
gt ->
merge_up(Na, Nb - 1, A, Br@1, [Bx@1 | Acc], Compare);
_ ->
merge_up(Na - 1, Nb, Ar@1, B, [Ax@1 | Acc], Compare)
end
end.
-spec merge_down(
integer(),
integer(),
list(ACK),
list(ACK),
list(ACK),
fun((ACK, ACK) -> gleam@order:order())
) -> list(ACK).
merge_down(Na, Nb, A, B, Acc, Compare) ->
case {Na, Nb, A, B} of
{0, 0, _, _} ->
Acc;
{_, 0, [Ax | Ar], _} ->
merge_down(Na - 1, Nb, Ar, B, [Ax | Acc], Compare);
{0, _, _, [Bx | Br]} ->
merge_down(Na, Nb - 1, A, Br, [Bx | Acc], Compare);
{_, _, [Ax@1 | Ar@1], [Bx@1 | Br@1]} ->
case Compare(Bx@1, Ax@1) of
lt ->
merge_down(Na - 1, Nb, Ar@1, B, [Ax@1 | Acc], Compare);
_ ->
merge_down(Na, Nb - 1, A, Br@1, [Bx@1 | Acc], Compare)
end
end.
-spec merge_sort(
list(ACP),
integer(),
fun((ACP, ACP) -> gleam@order:order()),
boolean()
) -> list(ACP).
merge_sort(L, Ln, Compare, Down) ->
N = Ln div 2,
A = L,
B = drop(L, N),
case Ln < 3 of
true ->
case Down of
true ->
merge_down(N, Ln - N, A, B, [], Compare);
false ->
merge_up(N, Ln - N, A, B, [], Compare)
end;
false ->
case Down of
true ->
merge_down(
N,
Ln - N,
merge_sort(A, N, Compare, false),
merge_sort(B, Ln - N, Compare, false),
[],
Compare
);
false ->
merge_up(
N,
Ln - N,
merge_sort(A, N, Compare, true),
merge_sort(B, Ln - N, Compare, true),
[],
Compare
)
end
end.
-spec sort(list(ACS), fun((ACS, ACS) -> gleam@order:order())) -> list(ACS).
sort(List, Compare) ->
merge_sort(List, length(List), Compare, true).
-spec do_shuffle_by_pair_indexes(list({float(), AJO})) -> list({float(), AJO}).
do_shuffle_by_pair_indexes(List_of_pairs) ->
sort(
List_of_pairs,
fun(A_pair, B_pair) ->
gleam@float:compare(
erlang:element(1, A_pair),
erlang:element(1, B_pair)
)
end
).
-spec tail_recursive_range(integer(), integer(), list(integer())) -> list(integer()).
tail_recursive_range(Start, Stop, Acc) ->
case gleam@int:compare(Start, Stop) of
eq ->
reverse([Stop | Acc]);
gt ->
tail_recursive_range(Start - 1, Stop, [Start | Acc]);
lt ->
tail_recursive_range(Start + 1, Stop, [Start | Acc])
end.
-spec range(integer(), integer()) -> list(integer()).
range(Start, Stop) ->
tail_recursive_range(Start, Stop, []).
-spec do_repeat(ACY, integer(), list(ACY)) -> list(ACY).
do_repeat(A, Times, Acc) ->
case Times =< 0 of
true ->
Acc;
false ->
do_repeat(A, Times - 1, [A | Acc])
end.
-spec repeat(ADB, integer()) -> list(ADB).
repeat(A, Times) ->
do_repeat(A, Times, []).
-spec do_split(list(ADD), integer(), list(ADD)) -> {list(ADD), list(ADD)}.
do_split(List, N, Taken) ->
case N =< 0 of
true ->
{reverse(Taken), List};
false ->
case List of
[] ->
{reverse(Taken), []};
[X | Xs] ->
do_split(Xs, N - 1, [X | Taken])
end
end.
-spec split(list(ADI), integer()) -> {list(ADI), list(ADI)}.
split(List, Index) ->
do_split(List, Index, []).
-spec do_split_while(list(ADM), fun((ADM) -> boolean()), list(ADM)) -> {list(ADM),
list(ADM)}.
do_split_while(List, F, Acc) ->
case List of
[] ->
{reverse(Acc), []};
[X | Xs] ->
case F(X) of
false ->
{reverse(Acc), List};
_ ->
do_split_while(Xs, F, [X | Acc])
end
end.
-spec split_while(list(ADR), fun((ADR) -> boolean())) -> {list(ADR), list(ADR)}.
split_while(List, Predicate) ->
do_split_while(List, Predicate, []).
-spec do_pop(list(AEE), fun((AEE) -> boolean()), list(AEE)) -> {ok,
{AEE, list(AEE)}} |
{error, nil}.
do_pop(Haystack, Predicate, Checked) ->
case Haystack of
[] ->
{error, nil};
[X | Rest] ->
case Predicate(X) of
true ->
{ok, {X, append(reverse(Checked), Rest)}};
false ->
do_pop(Rest, Predicate, [X | Checked])
end
end.
-spec pop(list(AEE), fun((AEE) -> boolean())) -> {ok, {AEE, list(AEE)}} |
{error, nil}.
pop(Haystack, Is_desired) ->
do_pop(Haystack, Is_desired, []).
-spec do_pop_map(list(AEN), fun((AEN) -> {ok, AEP} | {error, any()}), list(AEN)) -> {ok,
{AEP, list(AEN)}} |
{error, nil}.
do_pop_map(Haystack, Mapper, Checked) ->
case Haystack of
[] ->
{error, nil};
[X | Rest] ->
case Mapper(X) of
{ok, Y} ->
{ok, {Y, append(reverse(Checked), Rest)}};
{error, _} ->
do_pop_map(Rest, Mapper, [X | Checked])
end
end.
-spec pop_map(list(AEN), fun((AEN) -> {ok, AEP} | {error, any()})) -> {ok,
{AEP, list(AEN)}} |
{error, nil}.
pop_map(Haystack, Is_desired) ->
do_pop_map(Haystack, Is_desired, []).
-spec key_pop(list({AEW, AEX}), AEW) -> {ok, {AEX, list({AEW, AEX})}} |
{error, nil}.
key_pop(Haystack, Key) ->
pop_map(
Haystack,
fun(Entry) ->
{K, V} = Entry,
case K of
K@1 when K@1 =:= Key ->
{ok, V};
_ ->
{error, nil}
end
end
).
-spec key_set(list({AFC, AFD}), AFC, AFD) -> list({AFC, AFD}).
key_set(List, Key, Value) ->
case List of
[] ->
[{Key, Value}];
[{K, _} | Rest] when K =:= Key ->
[{Key, Value} | Rest];
[First | Rest@1] ->
[First | key_set(Rest@1, Key, Value)]
end.
-spec each(list(AFG), fun((AFG) -> any())) -> nil.
each(List, F) ->
case List of
[] ->
nil;
[X | Xs] ->
F(X),
each(Xs, F)
end.
-spec try_each(list(AFJ), fun((AFJ) -> {ok, any()} | {error, AFM})) -> {ok, nil} |
{error, AFM}.
try_each(List, Fun) ->
case List of
[] ->
{ok, nil};
[X | Xs] ->
case Fun(X) of
{ok, _} ->
try_each(Xs, Fun);
{error, E} ->
{error, E}
end
end.
-spec do_partition(list(AFW), fun((AFW) -> boolean()), list(AFW), list(AFW)) -> {list(AFW),
list(AFW)}.
do_partition(List, Categorise, Trues, Falses) ->
case List of
[] ->
{reverse(Trues), reverse(Falses)};
[X | Xs] ->
case Categorise(X) of
true ->
do_partition(Xs, Categorise, [X | Trues], Falses);
false ->
do_partition(Xs, Categorise, Trues, [X | Falses])
end
end.
-spec partition(list(AFW), fun((AFW) -> boolean())) -> {list(AFW), list(AFW)}.
partition(List, Categorise) ->
do_partition(List, Categorise, [], []).
-spec permutations(list(AGA)) -> list(list(AGA)).
permutations(L) ->
case L of
[] ->
[[]];
_ ->
_pipe = L,
_pipe@5 = index_map(_pipe, fun(I_idx, I) -> _pipe@1 = L,
_pipe@2 = index_fold(
_pipe@1,
[],
fun(Acc, J, J_idx) -> case I_idx =:= J_idx of
true ->
Acc;
false ->
[J | Acc]
end end
),
_pipe@3 = reverse(_pipe@2),
_pipe@4 = permutations(_pipe@3),
map(_pipe@4, fun(Permutation) -> [I | Permutation] end) end),
flatten(_pipe@5)
end.
-spec do_window(list(list(AGE)), list(AGE), integer()) -> list(list(AGE)).
do_window(Acc, L, N) ->
Window = take(L, N),
case length(Window) =:= N of
true ->
do_window([Window | Acc], drop(L, 1), N);
false ->
Acc
end.
-spec window(list(AGK), integer()) -> list(list(AGK)).
window(L, N) ->
_pipe = do_window([], L, N),
reverse(_pipe).
-spec drop_while(list(AGR), fun((AGR) -> boolean())) -> list(AGR).
drop_while(List, Predicate) ->
case List of
[] ->
[];
[X | Xs] ->
case Predicate(X) of
true ->
drop_while(Xs, Predicate);
false ->
[X | Xs]
end
end.
-spec do_take_while(list(AGU), fun((AGU) -> boolean()), list(AGU)) -> list(AGU).
do_take_while(List, Predicate, Acc) ->
case List of
[] ->
reverse(Acc);
[First | Rest] ->
case Predicate(First) of
true ->
do_take_while(Rest, Predicate, [First | Acc]);
false ->
reverse(Acc)
end
end.
-spec take_while(list(AGY), fun((AGY) -> boolean())) -> list(AGY).
take_while(List, Predicate) ->
do_take_while(List, Predicate, []).
-spec do_chunk(list(AHB), fun((AHB) -> AHD), AHD, list(AHB), list(list(AHB))) -> list(list(AHB)).
do_chunk(List, F, Previous_key, Current_chunk, Acc) ->
case List of
[First | Rest] ->
Key = F(First),
case Key =:= Previous_key of
false ->
New_acc = [reverse(Current_chunk) | Acc],
do_chunk(Rest, F, Key, [First], New_acc);
_ ->
do_chunk(Rest, F, Key, [First | Current_chunk], Acc)
end;
_ ->
reverse([reverse(Current_chunk) | Acc])
end.
-spec chunk(list(AHJ), fun((AHJ) -> any())) -> list(list(AHJ)).
chunk(List, F) ->
case List of
[] ->
[];
[First | Rest] ->
do_chunk(Rest, F, F(First), [First], [])
end.
-spec do_sized_chunk(
list(AHO),
integer(),
integer(),
list(AHO),
list(list(AHO))
) -> list(list(AHO)).
do_sized_chunk(List, Count, Left, Current_chunk, Acc) ->
case List of
[] ->
case Current_chunk of
[] ->
reverse(Acc);
Remaining ->
reverse([reverse(Remaining) | Acc])
end;
[First | Rest] ->
Chunk = [First | Current_chunk],
case Left > 1 of
false ->
do_sized_chunk(
Rest,
Count,
Count,
[],
[reverse(Chunk) | Acc]
);
true ->
do_sized_chunk(Rest, Count, Left - 1, Chunk, Acc)
end
end.
-spec sized_chunk(list(AHV), integer()) -> list(list(AHV)).
sized_chunk(List, Count) ->
do_sized_chunk(List, Count, Count, [], []).
-spec do_scan(list(AID), AIF, list(AIF), fun((AIF, AID) -> AIF)) -> list(AIF).
do_scan(List, Accumulator, Accumulated, Fun) ->
case List of
[] ->
reverse(Accumulated);
[X | Xs] ->
Next = Fun(Accumulator, X),
do_scan(Xs, Next, [Next | Accumulated], Fun)
end.
-spec scan(list(AII), AIK, fun((AIK, AII) -> AIK)) -> list(AIK).
scan(List, Initial, Fun) ->
do_scan(List, Initial, [], Fun).
-spec combinations(list(AIQ), integer()) -> list(list(AIQ)).
combinations(Items, N) ->
case N of
0 ->
[[]];
_ ->
case Items of
[] ->
[];
[X | Xs] ->
First_combinations = begin
_pipe = map(
combinations(Xs, N - 1),
fun(Com) -> [X | Com] end
),
reverse(_pipe)
end,
fold(
First_combinations,
combinations(Xs, N),
fun(Acc, C) -> [C | Acc] end
)
end
end.
-spec do_combination_pairs(list(AIU)) -> list(list({AIU, AIU})).
do_combination_pairs(Items) ->
case Items of
[] ->
[];
[X | Xs] ->
First_combinations = map(Xs, fun(Other) -> {X, Other} end),
[First_combinations | do_combination_pairs(Xs)]
end.
-spec combination_pairs(list(AIY)) -> list({AIY, AIY}).
combination_pairs(Items) ->
_pipe = do_combination_pairs(Items),
flatten(_pipe).
-spec transpose(list(list(AJF))) -> list(list(AJF)).
transpose(List_of_list) ->
Take_first = fun(List) -> case List of
[] ->
[];
[F] ->
[F];
[F@1 | _] ->
[F@1]
end end,
case List_of_list of
[] ->
[];
[[] | Xss] ->
transpose(Xss);
Rows ->
Firsts = begin
_pipe = Rows,
_pipe@1 = map(_pipe, Take_first),
flatten(_pipe@1)
end,
Rest = transpose(map(Rows, fun(_capture) -> drop(_capture, 1) end)),
[Firsts | Rest]
end.
-spec interleave(list(list(AJB))) -> list(AJB).
interleave(List) ->
_pipe = transpose(List),
flatten(_pipe).
-spec do_shuffle_pair_unwrap(list({float(), AJK}), list(AJK)) -> list(AJK).
do_shuffle_pair_unwrap(List, Acc) ->
case List of
[] ->
Acc;
_ ->
[Elem_pair | Enumerable] = List,
do_shuffle_pair_unwrap(
Enumerable,
[erlang:element(2, Elem_pair) | Acc]
)
end.
-spec shuffle(list(AJR)) -> list(AJR).
shuffle(List) ->
_pipe = List,
_pipe@1 = fold(
_pipe,
[],
fun(Acc, A) -> [{gleam@float:random(0.0, 1.0), A} | Acc] end
),
_pipe@2 = do_shuffle_by_pair_indexes(_pipe@1),
do_shuffle_pair_unwrap(_pipe@2, []).