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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, nowarn_unused_function, nowarn_nomatch]).
-export([length/1, reverse/1, is_empty/1, contains/2, first/1, rest/1, filter/2, filter_map/2, map/2, map2/3, index_map/2, try_map/2, drop/2, take/2, new/0, wrap/1, append/2, prepend/2, concat/1, flatten/1, flat_map/2, fold/3, count/2, group/2, map_fold/3, fold_right/3, index_fold/3, try_fold/3, fold_until/3, find/2, find_map/2, all/2, any/2, zip/2, strict_zip/2, unzip/1, intersperse/2, unique/1, sort/2, range/2, repeat/2, split/2, split_while/2, key_find/2, key_filter/2, pop/2, pop_map/2, key_pop/2, key_set/3, each/2, try_each/2, partition/2, permutations/1, window/2, window_by_2/1, drop_while/2, take_while/2, chunk/2, sized_chunk/2, reduce/2, scan/3, last/1, combinations/2, combination_pairs/1, transpose/1, interleave/1, shuffle/1]).
-export_type([continue_or_stop/1, sorting/0]).
-type continue_or_stop(AAS) :: {continue, AAS} | {stop, AAS}.
-type sorting() :: ascending | descending.
-spec count_length(list(any()), integer()) -> integer().
count_length(List, Count) ->
case List of
[_ | List@1] ->
count_length(List@1, Count + 1);
_ ->
Count
end.
-spec length(list(any())) -> integer().
length(List) ->
erlang:length(List).
-spec do_reverse(list(ASP), list(ASP)) -> list(ASP).
do_reverse(Remaining, Accumulator) ->
case Remaining of
[] ->
Accumulator;
[Item | Rest] ->
do_reverse(Rest, [Item | Accumulator])
end.
-spec reverse(list(AAZ)) -> list(AAZ).
reverse(Xs) ->
lists:reverse(Xs).
-spec is_empty(list(any())) -> boolean().
is_empty(List) ->
List =:= [].
-spec contains(list(ABH), ABH) -> boolean().
contains(List, Elem) ->
case List of
[] ->
false;
[First | _] when First =:= Elem ->
true;
[_ | Rest] ->
contains(Rest, Elem)
end.
-spec first(list(ABJ)) -> {ok, ABJ} | {error, nil}.
first(List) ->
case List of
[] ->
{error, nil};
[X | _] ->
{ok, X}
end.
-spec rest(list(ABN)) -> {ok, list(ABN)} | {error, nil}.
rest(List) ->
case List of
[] ->
{error, nil};
[_ | Xs] ->
{ok, Xs}
end.
-spec update_group(fun((ABS) -> ABT)) -> fun((gleam@dict:dict(ABT, list(ABS)), ABS) -> gleam@dict:dict(ABT, list(ABS))).
update_group(F) ->
fun(Groups, Elem) -> case gleam@dict:get(Groups, F(Elem)) of
{ok, Existing} ->
gleam@dict:insert(Groups, F(Elem), [Elem | Existing]);
{error, _} ->
gleam@dict:insert(Groups, F(Elem), [Elem])
end end.
-spec do_filter(list(ACG), fun((ACG) -> boolean()), list(ACG)) -> list(ACG).
do_filter(List, Fun, Acc) ->
case List of
[] ->
lists: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(ACK), fun((ACK) -> boolean())) -> list(ACK).
filter(List, Predicate) ->
do_filter(List, Predicate, []).
-spec do_filter_map(
list(ACN),
fun((ACN) -> {ok, ACP} | {error, any()}),
list(ACP)
) -> list(ACP).
do_filter_map(List, Fun, Acc) ->
case List of
[] ->
lists: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(ACV), fun((ACV) -> {ok, ACX} | {error, any()})) -> list(ACX).
filter_map(List, Fun) ->
do_filter_map(List, Fun, []).
-spec do_map(list(ADC), fun((ADC) -> ADE), list(ADE)) -> list(ADE).
do_map(List, Fun, Acc) ->
case List of
[] ->
lists:reverse(Acc);
[X | Xs] ->
do_map(Xs, Fun, [Fun(X) | Acc])
end.
-spec map(list(ADH), fun((ADH) -> ADJ)) -> list(ADJ).
map(List, Fun) ->
do_map(List, Fun, []).
-spec do_map2(list(ADR), list(ADT), fun((ADR, ADT) -> ADV), list(ADV)) -> list(ADV).
do_map2(List1, List2, Fun, Acc) ->
case {List1, List2} of
{[], _} ->
lists:reverse(Acc);
{_, []} ->
lists:reverse(Acc);
{[A | As_], [B | Bs]} ->
do_map2(As_, Bs, Fun, [Fun(A, B) | Acc])
end.
-spec map2(list(ADL), list(ADN), fun((ADL, ADN) -> ADP)) -> list(ADP).
map2(List1, List2, Fun) ->
do_map2(List1, List2, Fun, []).
-spec do_index_map(
list(AED),
fun((AED, integer()) -> AEF),
integer(),
list(AEF)
) -> list(AEF).
do_index_map(List, Fun, Index, Acc) ->
case List of
[] ->
lists:reverse(Acc);
[X | Xs] ->
Acc@1 = [Fun(X, Index) | Acc],
do_index_map(Xs, Fun, Index + 1, Acc@1)
end.
-spec index_map(list(AEI), fun((AEI, integer()) -> AEK)) -> list(AEK).
index_map(List, Fun) ->
do_index_map(List, Fun, 0, []).
-spec do_try_map(list(AEM), fun((AEM) -> {ok, AEO} | {error, AEP}), list(AEO)) -> {ok,
list(AEO)} |
{error, AEP}.
do_try_map(List, Fun, Acc) ->
case List of
[] ->
{ok, lists: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(AEW), fun((AEW) -> {ok, AEY} | {error, AEZ})) -> {ok,
list(AEY)} |
{error, AEZ}.
try_map(List, Fun) ->
do_try_map(List, Fun, []).
-spec drop(list(AFF), integer()) -> list(AFF).
drop(List, N) ->
case N =< 0 of
true ->
List;
false ->
case List of
[] ->
[];
[_ | Xs] ->
drop(Xs, N - 1)
end
end.
-spec do_take(list(AFI), integer(), list(AFI)) -> list(AFI).
do_take(List, N, Acc) ->
case N =< 0 of
true ->
lists:reverse(Acc);
false ->
case List of
[] ->
lists:reverse(Acc);
[X | Xs] ->
do_take(Xs, N - 1, [X | Acc])
end
end.
-spec take(list(AFM), integer()) -> list(AFM).
take(List, N) ->
do_take(List, N, []).
-spec new() -> list(any()).
new() ->
[].
-spec wrap(AFR) -> list(AFR).
wrap(Item) ->
[Item].
-spec do_append(list(AFX), list(AFX)) -> list(AFX).
do_append(First, Second) ->
case First of
[] ->
Second;
[Item | Rest] ->
do_append(Rest, [Item | Second])
end.
-spec append(list(AFT), list(AFT)) -> list(AFT).
append(First, Second) ->
lists:append(First, Second).
-spec prepend(list(AGB), AGB) -> list(AGB).
prepend(List, Item) ->
[Item | List].
-spec reverse_and_prepend(list(AGE), list(AGE)) -> list(AGE).
reverse_and_prepend(Prefix, Suffix) ->
case Prefix of
[] ->
Suffix;
[First | Rest] ->
reverse_and_prepend(Rest, [First | Suffix])
end.
-spec do_concat(list(list(AGI)), list(AGI)) -> list(AGI).
do_concat(Lists, Acc) ->
case Lists of
[] ->
lists:reverse(Acc);
[List | Further_lists] ->
do_concat(Further_lists, reverse_and_prepend(List, Acc))
end.
-spec concat(list(list(AGN))) -> list(AGN).
concat(Lists) ->
do_concat(Lists, []).
-spec flatten(list(list(AGR))) -> list(AGR).
flatten(Lists) ->
do_concat(Lists, []).
-spec flat_map(list(AGV), fun((AGV) -> list(AGX))) -> list(AGX).
flat_map(List, Fun) ->
_pipe = map(List, Fun),
concat(_pipe).
-spec fold(list(AHA), AHC, fun((AHC, AHA) -> AHC)) -> AHC.
fold(List, Initial, Fun) ->
case List of
[] ->
Initial;
[X | Rest] ->
fold(Rest, Fun(Initial, X), Fun)
end.
-spec count(list(AAX), fun((AAX) -> boolean())) -> integer().
count(List, Predicate) ->
fold(List, 0, fun(Acc, Value) -> case Predicate(Value) of
true ->
Acc + 1;
false ->
Acc
end end).
-spec group(list(ACA), fun((ACA) -> ACC)) -> gleam@dict:dict(ACC, list(ACA)).
group(List, Key) ->
fold(List, gleam@dict:new(), update_group(Key)).
-spec map_fold(list(ADY), AEA, fun((AEA, ADY) -> {AEA, AEB})) -> {AEA,
list(AEB)}.
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 lists:reverse/1).
-spec fold_right(list(AHD), AHF, fun((AHF, AHD) -> AHF)) -> AHF.
fold_right(List, Initial, Fun) ->
case List of
[] ->
Initial;
[X | Rest] ->
Fun(fold_right(Rest, Initial, Fun), X)
end.
-spec do_index_fold(
list(AHG),
AHI,
fun((AHI, AHG, integer()) -> AHI),
integer()
) -> AHI.
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(AHJ), AHL, fun((AHL, AHJ, integer()) -> AHL)) -> AHL.
index_fold(Over, Initial, Fun) ->
do_index_fold(Over, Initial, Fun, 0).
-spec try_fold(list(AHM), AHO, fun((AHO, AHM) -> {ok, AHO} | {error, AHP})) -> {ok,
AHO} |
{error, AHP}.
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(AHU), AHW, fun((AHW, AHU) -> continue_or_stop(AHW))) -> AHW.
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(AHY), fun((AHY) -> boolean())) -> {ok, AHY} | {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(AIC), fun((AIC) -> {ok, AIE} | {error, any()})) -> {ok, AIE} |
{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 all(list(AIK), fun((AIK) -> 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(AIM), fun((AIM) -> 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(AIO), list(AIQ), list({AIO, AIQ})) -> list({AIO, AIQ}).
do_zip(Xs, Ys, Acc) ->
case {Xs, Ys} of
{[X | Xs@1], [Y | Ys@1]} ->
do_zip(Xs@1, Ys@1, [{X, Y} | Acc]);
{_, _} ->
lists:reverse(Acc)
end.
-spec zip(list(AIU), list(AIW)) -> list({AIU, AIW}).
zip(List, Other) ->
do_zip(List, Other, []).
-spec strict_zip(list(AIZ), list(AJB)) -> {ok, list({AIZ, AJB})} | {error, nil}.
strict_zip(List, Other) ->
case erlang:length(List) =:= erlang:length(Other) of
true ->
{ok, zip(List, Other)};
false ->
{error, nil}
end.
-spec do_unzip(list({AZU, AZV}), list(AZU), list(AZV)) -> {list(AZU), list(AZV)}.
do_unzip(Input, Xs, Ys) ->
case Input of
[] ->
{lists:reverse(Xs), lists:reverse(Ys)};
[{X, Y} | Rest] ->
do_unzip(Rest, [X | Xs], [Y | Ys])
end.
-spec unzip(list({AJK, AJL})) -> {list(AJK), list(AJL)}.
unzip(Input) ->
do_unzip(Input, [], []).
-spec do_intersperse(list(AJP), AJP, list(AJP)) -> list(AJP).
do_intersperse(List, Separator, Acc) ->
case List of
[] ->
lists:reverse(Acc);
[X | Rest] ->
do_intersperse(Rest, Separator, [X, Separator | Acc])
end.
-spec intersperse(list(AJT), AJT) -> list(AJT).
intersperse(List, Elem) ->
case List of
[] ->
List;
[_] ->
List;
[X | Rest] ->
do_intersperse(Rest, Elem, [X])
end.
-spec unique(list(AJW)) -> list(AJW).
unique(List) ->
case List of
[] ->
[];
[X | Rest] ->
[X | unique(filter(Rest, fun(Y) -> Y /= X end))]
end.
-spec sequences(
list(AKC),
fun((AKC, AKC) -> gleam@order:order()),
list(AKC),
sorting(),
AKC,
list(list(AKC))
) -> list(list(AKC)).
sequences(List, Compare, Growing, Direction, Prev, Acc) ->
Growing@1 = [Prev | Growing],
case List of
[] ->
case Direction of
ascending ->
[do_reverse(Growing@1, []) | Acc];
descending ->
[Growing@1 | Acc]
end;
[New | Rest] ->
case {Compare(Prev, New), Direction} of
{gt, descending} ->
sequences(Rest, Compare, Growing@1, Direction, New, Acc);
{lt, ascending} ->
sequences(Rest, Compare, Growing@1, Direction, New, Acc);
{eq, ascending} ->
sequences(Rest, Compare, Growing@1, Direction, New, Acc);
{gt, ascending} ->
Acc@1 = case Direction of
ascending ->
[do_reverse(Growing@1, []) | Acc];
descending ->
[Growing@1 | Acc]
end,
case Rest of
[] ->
[[New] | Acc@1];
[Next | Rest@1] ->
Direction@1 = case Compare(New, Next) of
lt ->
ascending;
eq ->
ascending;
gt ->
descending
end,
sequences(
Rest@1,
Compare,
[New],
Direction@1,
Next,
Acc@1
)
end;
{lt, descending} ->
Acc@1 = case Direction of
ascending ->
[do_reverse(Growing@1, []) | Acc];
descending ->
[Growing@1 | Acc]
end,
case Rest of
[] ->
[[New] | Acc@1];
[Next | Rest@1] ->
Direction@1 = case Compare(New, Next) of
lt ->
ascending;
eq ->
ascending;
gt ->
descending
end,
sequences(
Rest@1,
Compare,
[New],
Direction@1,
Next,
Acc@1
)
end;
{eq, descending} ->
Acc@1 = case Direction of
ascending ->
[do_reverse(Growing@1, []) | Acc];
descending ->
[Growing@1 | Acc]
end,
case Rest of
[] ->
[[New] | Acc@1];
[Next | Rest@1] ->
Direction@1 = case Compare(New, Next) of
lt ->
ascending;
eq ->
ascending;
gt ->
descending
end,
sequences(
Rest@1,
Compare,
[New],
Direction@1,
Next,
Acc@1
)
end
end
end.
-spec merge_ascendings(
list(AKZ),
list(AKZ),
fun((AKZ, AKZ) -> gleam@order:order()),
list(AKZ)
) -> list(AKZ).
merge_ascendings(List1, List2, Compare, Acc) ->
case {List1, List2} of
{[], List} ->
do_reverse(List, Acc);
{List, []} ->
do_reverse(List, Acc);
{[First1 | Rest1], [First2 | Rest2]} ->
case Compare(First1, First2) of
lt ->
merge_ascendings(Rest1, List2, Compare, [First1 | Acc]);
gt ->
merge_ascendings(List1, Rest2, Compare, [First2 | Acc]);
eq ->
merge_ascendings(List1, Rest2, Compare, [First2 | Acc])
end
end.
-spec merge_ascending_pairs(
list(list(AKN)),
fun((AKN, AKN) -> gleam@order:order()),
list(list(AKN))
) -> list(list(AKN)).
merge_ascending_pairs(Sequences, Compare, Acc) ->
case Sequences of
[] ->
do_reverse(Acc, []);
[Sequence] ->
do_reverse([do_reverse(Sequence, []) | Acc], []);
[Ascending1, Ascending2 | Rest] ->
Descending = merge_ascendings(Ascending1, Ascending2, Compare, []),
merge_ascending_pairs(Rest, Compare, [Descending | Acc])
end.
-spec merge_descendings(
list(ALE),
list(ALE),
fun((ALE, ALE) -> gleam@order:order()),
list(ALE)
) -> list(ALE).
merge_descendings(List1, List2, Compare, Acc) ->
case {List1, List2} of
{[], List} ->
do_reverse(List, Acc);
{List, []} ->
do_reverse(List, Acc);
{[First1 | Rest1], [First2 | Rest2]} ->
case Compare(First1, First2) of
lt ->
merge_descendings(List1, Rest2, Compare, [First2 | Acc]);
gt ->
merge_descendings(Rest1, List2, Compare, [First1 | Acc]);
eq ->
merge_descendings(Rest1, List2, Compare, [First1 | Acc])
end
end.
-spec merge_descending_pairs(
list(list(AKT)),
fun((AKT, AKT) -> gleam@order:order()),
list(list(AKT))
) -> list(list(AKT)).
merge_descending_pairs(Sequences, Compare, Acc) ->
case Sequences of
[] ->
do_reverse(Acc, []);
[Sequence] ->
do_reverse([do_reverse(Sequence, []) | Acc], []);
[Descending1, Descending2 | Rest] ->
Ascending = merge_descendings(Descending1, Descending2, Compare, []),
merge_descending_pairs(Rest, Compare, [Ascending | Acc])
end.
-spec merge_all(
list(list(AKJ)),
sorting(),
fun((AKJ, AKJ) -> gleam@order:order())
) -> list(AKJ).
merge_all(Sequences, Direction, Compare) ->
case {Sequences, Direction} of
{[], _} ->
[];
{[Sequence], ascending} ->
Sequence;
{[Sequence@1], descending} ->
do_reverse(Sequence@1, []);
{_, ascending} ->
Sequences@1 = merge_ascending_pairs(Sequences, Compare, []),
merge_all(Sequences@1, descending, Compare);
{_, descending} ->
Sequences@2 = merge_descending_pairs(Sequences, Compare, []),
merge_all(Sequences@2, ascending, Compare)
end.
-spec sort(list(AJZ), fun((AJZ, AJZ) -> gleam@order:order())) -> list(AJZ).
sort(List, Compare) ->
case List of
[] ->
[];
[X] ->
[X];
[X@1, Y | Rest] ->
Direction = case Compare(X@1, Y) of
lt ->
ascending;
eq ->
ascending;
gt ->
descending
end,
Sequences = sequences(Rest, Compare, [X@1], Direction, Y, []),
merge_all(Sequences, ascending, Compare)
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 ->
[Stop | Acc];
gt ->
tail_recursive_range(Start, Stop + 1, [Stop | Acc]);
lt ->
tail_recursive_range(Start, Stop - 1, [Stop | Acc])
end.
-spec range(integer(), integer()) -> list(integer()).
range(Start, Stop) ->
tail_recursive_range(Start, Stop, []).
-spec do_repeat(ALM, integer(), list(ALM)) -> list(ALM).
do_repeat(A, Times, Acc) ->
case Times =< 0 of
true ->
Acc;
false ->
do_repeat(A, Times - 1, [A | Acc])
end.
-spec repeat(ALP, integer()) -> list(ALP).
repeat(A, Times) ->
do_repeat(A, Times, []).
-spec do_split(list(ALR), integer(), list(ALR)) -> {list(ALR), list(ALR)}.
do_split(List, N, Taken) ->
case N =< 0 of
true ->
{lists:reverse(Taken), List};
false ->
case List of
[] ->
{lists:reverse(Taken), []};
[X | Xs] ->
do_split(Xs, N - 1, [X | Taken])
end
end.
-spec split(list(ALW), integer()) -> {list(ALW), list(ALW)}.
split(List, Index) ->
do_split(List, Index, []).
-spec do_split_while(list(AMA), fun((AMA) -> boolean()), list(AMA)) -> {list(AMA),
list(AMA)}.
do_split_while(List, F, Acc) ->
case List of
[] ->
{lists:reverse(Acc), []};
[X | Xs] ->
case F(X) of
false ->
{lists:reverse(Acc), List};
_ ->
do_split_while(Xs, F, [X | Acc])
end
end.
-spec split_while(list(AMF), fun((AMF) -> boolean())) -> {list(AMF), list(AMF)}.
split_while(List, Predicate) ->
do_split_while(List, Predicate, []).
-spec key_find(list({AMJ, AMK}), AMJ) -> {ok, AMK} | {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 key_filter(list({AMO, AMP}), AMO) -> list(AMP).
key_filter(Keyword_list, Desired_key) ->
filter_map(
Keyword_list,
fun(Keyword) ->
{Key, Value} = Keyword,
case Key =:= Desired_key of
true ->
{ok, Value};
false ->
{error, nil}
end
end
).
-spec do_pop(list(BEV), fun((BEV) -> boolean()), list(BEV)) -> {ok,
{BEV, list(BEV)}} |
{error, nil}.
do_pop(Haystack, Predicate, Checked) ->
case Haystack of
[] ->
{error, nil};
[X | Rest] ->
case Predicate(X) of
true ->
{ok, {X, lists:append(lists:reverse(Checked), Rest)}};
false ->
do_pop(Rest, Predicate, [X | Checked])
end
end.
-spec pop(list(AMW), fun((AMW) -> boolean())) -> {ok, {AMW, list(AMW)}} |
{error, nil}.
pop(Haystack, Is_desired) ->
do_pop(Haystack, Is_desired, []).
-spec do_pop_map(list(BFJ), fun((BFJ) -> {ok, BFW} | {error, any()}), list(BFJ)) -> {ok,
{BFW, list(BFJ)}} |
{error, nil}.
do_pop_map(Haystack, Mapper, Checked) ->
case Haystack of
[] ->
{error, nil};
[X | Rest] ->
case Mapper(X) of
{ok, Y} ->
{ok, {Y, lists:append(lists:reverse(Checked), Rest)}};
{error, _} ->
do_pop_map(Rest, Mapper, [X | Checked])
end
end.
-spec pop_map(list(ANF), fun((ANF) -> {ok, ANH} | {error, any()})) -> {ok,
{ANH, list(ANF)}} |
{error, nil}.
pop_map(Haystack, Is_desired) ->
do_pop_map(Haystack, Is_desired, []).
-spec key_pop(list({ANO, ANP}), ANO) -> {ok, {ANP, list({ANO, ANP})}} |
{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({ANU, ANV}), ANU, ANV) -> list({ANU, ANV}).
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(ANY), fun((ANY) -> any())) -> nil.
each(List, F) ->
case List of
[] ->
nil;
[X | Xs] ->
F(X),
each(Xs, F)
end.
-spec try_each(list(AOB), fun((AOB) -> {ok, any()} | {error, AOE})) -> {ok, nil} |
{error, AOE}.
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(BHD), fun((BHD) -> boolean()), list(BHD), list(BHD)) -> {list(BHD),
list(BHD)}.
do_partition(List, Categorise, Trues, Falses) ->
case List of
[] ->
{lists:reverse(Trues), lists: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(AOO), fun((AOO) -> boolean())) -> {list(AOO), list(AOO)}.
partition(List, Categorise) ->
do_partition(List, Categorise, [], []).
-spec permutations(list(AOS)) -> list(list(AOS)).
permutations(L) ->
case L of
[] ->
[[]];
_ ->
_pipe = L,
_pipe@5 = index_map(_pipe, fun(I, I_idx) -> _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 = lists:reverse(_pipe@2),
_pipe@4 = permutations(_pipe@3),
map(_pipe@4, fun(Permutation) -> [I | Permutation] end) end),
concat(_pipe@5)
end.
-spec do_window(list(list(AOW)), list(AOW), integer()) -> list(list(AOW)).
do_window(Acc, L, N) ->
Window = take(L, N),
case erlang:length(Window) =:= N of
true ->
do_window([Window | Acc], drop(L, 1), N);
false ->
Acc
end.
-spec window(list(APC), integer()) -> list(list(APC)).
window(L, N) ->
case N =< 0 of
true ->
[];
false ->
_pipe = do_window([], L, N),
lists:reverse(_pipe)
end.
-spec window_by_2(list(APG)) -> list({APG, APG}).
window_by_2(L) ->
zip(L, drop(L, 1)).
-spec drop_while(list(APJ), fun((APJ) -> boolean())) -> list(APJ).
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(APM), fun((APM) -> boolean()), list(APM)) -> list(APM).
do_take_while(List, Predicate, Acc) ->
case List of
[] ->
lists:reverse(Acc);
[First | Rest] ->
case Predicate(First) of
true ->
do_take_while(Rest, Predicate, [First | Acc]);
false ->
lists:reverse(Acc)
end
end.
-spec take_while(list(APQ), fun((APQ) -> boolean())) -> list(APQ).
take_while(List, Predicate) ->
do_take_while(List, Predicate, []).
-spec do_chunk(list(APT), fun((APT) -> APV), APV, list(APT), list(list(APT))) -> list(list(APT)).
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 = [lists:reverse(Current_chunk) | Acc],
do_chunk(Rest, F, Key, [First], New_acc);
_ ->
do_chunk(Rest, F, Key, [First | Current_chunk], Acc)
end;
_ ->
lists:reverse([lists:reverse(Current_chunk) | Acc])
end.
-spec chunk(list(AQB), fun((AQB) -> any())) -> list(list(AQB)).
chunk(List, F) ->
case List of
[] ->
[];
[First | Rest] ->
do_chunk(Rest, F, F(First), [First], [])
end.
-spec do_sized_chunk(
list(AQG),
integer(),
integer(),
list(AQG),
list(list(AQG))
) -> list(list(AQG)).
do_sized_chunk(List, Count, Left, Current_chunk, Acc) ->
case List of
[] ->
case Current_chunk of
[] ->
lists:reverse(Acc);
Remaining ->
lists:reverse([lists:reverse(Remaining) | Acc])
end;
[First | Rest] ->
Chunk = [First | Current_chunk],
case Left > 1 of
false ->
do_sized_chunk(
Rest,
Count,
Count,
[],
[lists:reverse(Chunk) | Acc]
);
true ->
do_sized_chunk(Rest, Count, Left - 1, Chunk, Acc)
end
end.
-spec sized_chunk(list(AQN), integer()) -> list(list(AQN)).
sized_chunk(List, Count) ->
do_sized_chunk(List, Count, Count, [], []).
-spec reduce(list(AQR), fun((AQR, AQR) -> AQR)) -> {ok, AQR} | {error, nil}.
reduce(List, Fun) ->
case List of
[] ->
{error, nil};
[First | Rest] ->
{ok, fold(Rest, First, Fun)}
end.
-spec do_scan(list(AQV), AQX, list(AQX), fun((AQX, AQV) -> AQX)) -> list(AQX).
do_scan(List, Accumulator, Accumulated, Fun) ->
case List of
[] ->
lists:reverse(Accumulated);
[X | Xs] ->
Next = Fun(Accumulator, X),
do_scan(Xs, Next, [Next | Accumulated], Fun)
end.
-spec scan(list(ARA), ARC, fun((ARC, ARA) -> ARC)) -> list(ARC).
scan(List, Initial, Fun) ->
do_scan(List, Initial, [], Fun).
-spec last(list(ARE)) -> {ok, ARE} | {error, nil}.
last(List) ->
_pipe = List,
reduce(_pipe, fun(_, Elem) -> Elem end).
-spec combinations(list(ARI), integer()) -> list(list(ARI)).
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
),
lists:reverse(_pipe)
end,
fold(
First_combinations,
combinations(Xs, N),
fun(Acc, C) -> [C | Acc] end
)
end
end.
-spec do_combination_pairs(list(ARM)) -> list(list({ARM, ARM})).
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(ARQ)) -> list({ARQ, ARQ}).
combination_pairs(Items) ->
_pipe = do_combination_pairs(Items),
concat(_pipe).
-spec transpose(list(list(ARX))) -> list(list(ARX)).
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),
concat(_pipe@1)
end,
Rest = transpose(map(Rows, fun(_capture) -> drop(_capture, 1) end)),
[Firsts | Rest]
end.
-spec interleave(list(list(ART))) -> list(ART).
interleave(List) ->
_pipe = transpose(List),
concat(_pipe).
-spec do_shuffle_pair_unwrap(list({float(), ASC}), list(ASC)) -> list(ASC).
do_shuffle_pair_unwrap(List, Acc) ->
case List of
[] ->
Acc;
[Elem_pair | Enumerable] ->
do_shuffle_pair_unwrap(
Enumerable,
[erlang:element(2, Elem_pair) | Acc]
)
end.
-spec do_shuffle_by_pair_indexes(list({float(), ASG})) -> list({float(), ASG}).
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 shuffle(list(ASJ)) -> list(ASJ).
shuffle(List) ->
_pipe = List,
_pipe@1 = fold(_pipe, [], fun(Acc, A) -> [{rand:uniform(), A} | Acc] end),
_pipe@2 = do_shuffle_by_pair_indexes(_pipe@1),
do_shuffle_pair_unwrap(_pipe@2, []).