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retired
A standard library for the Gleam programming language
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Files
gen/src/gleam@list.erl
-module(gleam@list).
-compile(no_auto_import).
-export([length/1, reverse/1, is_empty/1, contains/2, head/1, tail/1, filter/2, filter_map/2, map/2, index_map/2, try_map/2, drop/2, take/2, new/0, append/2, flatten/1, 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, at/2, unique/1, sort/2, range/2, repeat/2, split/2, split_while/2, key_find/2, pop/2, pop_map/2, key_pop/2, key_set/3, each/2, partition/2, permutations/1, window/2, window_by_2/1]).
-export_type([length_mismatch/0, continue_or_stop/1]).
-type length_mismatch() :: length_mismatch.
-type continue_or_stop(VW) :: {continue, VW} | {stop, VW}.
-spec length(list(any())) -> integer().
length(A) ->
erlang:length(A).
-spec reverse(list(VZ)) -> list(VZ).
reverse(A) ->
lists:reverse(A).
-spec is_empty(list(any())) -> boolean().
is_empty(List) ->
List =:= [].
-spec contains(list(WE), WE) -> boolean().
contains(List, Elem) ->
case List of
[] ->
false;
[Head | Rest] ->
(Head =:= Elem) orelse contains(Rest, Elem)
end.
-spec head(list(WG)) -> {ok, WG} | {error, nil}.
head(List) ->
case List of
[] ->
{error, nil};
[X | _] ->
{ok, X}
end.
-spec tail(list(WK)) -> {ok, list(WK)} | {error, nil}.
tail(List) ->
case List of
[] ->
{error, nil};
[_ | Xs] ->
{ok, Xs}
end.
-spec do_filter(list(WP), fun((WP) -> boolean()), list(WP)) -> list(WP).
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(WT), fun((WT) -> boolean())) -> list(WT).
filter(List, Predicate) ->
do_filter(List, Predicate, []).
-spec do_filter_map(list(WW), fun((WW) -> {ok, WY} | {error, any()}), list(WY)) -> list(WY).
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(XE), fun((XE) -> {ok, XG} | {error, any()})) -> list(XG).
filter_map(List, Fun) ->
do_filter_map(List, Fun, []).
-spec do_map(list(XL), fun((XL) -> XN), list(XN)) -> list(XN).
do_map(List, Fun, Acc) ->
case List of
[] ->
lists:reverse(Acc);
[X | Xs] ->
do_map(Xs, Fun, [Fun(X) | Acc])
end.
-spec map(list(XQ), fun((XQ) -> XS)) -> list(XS).
map(List, Fun) ->
do_map(List, Fun, []).
-spec do_index_map(list(XU), fun((integer(), XU) -> XW), integer(), list(XW)) -> list(XW).
do_index_map(List, Fun, Index, Acc) ->
case List of
[] ->
lists:reverse(Acc);
[X | Xs] ->
do_index_map(Xs, Fun, Index + 1, [Fun(Index, X) | Acc])
end.
-spec index_map(list(XZ), fun((integer(), XZ) -> YB)) -> list(YB).
index_map(List, Fun) ->
do_index_map(List, Fun, 0, []).
-spec do_try_map(list(YD), fun((YD) -> {ok, YF} | {error, YG}), list(YF)) -> {ok,
list(YF)} |
{error, YG}.
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(YN), fun((YN) -> {ok, YP} | {error, YQ})) -> {ok, list(YP)} |
{error, YQ}.
try_map(List, Fun) ->
do_try_map(List, Fun, []).
-spec drop(list(YW), integer()) -> list(YW).
drop(List, N) ->
case N =< 0 of
true ->
List;
false ->
case List of
[] ->
[];
[_ | Xs] ->
drop(Xs, N - 1)
end
end.
-spec do_take(list(YZ), integer(), list(YZ)) -> list(YZ).
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(AAD), integer()) -> list(AAD).
take(List, N) ->
do_take(List, N, []).
-spec new() -> list(any()).
new() ->
[].
-spec append(list(AAI), list(AAI)) -> list(AAI).
append(A, B) ->
lists:append(A, B).
-spec do_flatten(list(list(AAM)), list(AAM)) -> list(AAM).
do_flatten(Lists, Acc) ->
case Lists of
[] ->
Acc;
[L | Rest] ->
do_flatten(Rest, lists:append(Acc, L))
end.
-spec flatten(list(list(AAR))) -> list(AAR).
flatten(Lists) ->
do_flatten(Lists, []).
-spec fold(list(AAV), AAX, fun((AAV, AAX) -> AAX)) -> AAX.
fold(List, Initial, Fun) ->
case List of
[] ->
Initial;
[X | Rest] ->
fold(Rest, Fun(X, Initial), Fun)
end.
-spec fold_right(list(AAY), ABA, fun((AAY, ABA) -> ABA)) -> ABA.
fold_right(List, Initial, Fun) ->
case List of
[] ->
Initial;
[X | Rest] ->
Fun(X, fold_right(Rest, Initial, Fun))
end.
-spec do_index_fold(
list(ABB),
ABD,
fun((integer(), ABB, ABD) -> ABD),
integer()
) -> ABD.
do_index_fold(Over, Acc, With, Index) ->
case Over of
[] ->
Acc;
[First | Rest] ->
do_index_fold(Rest, With(Index, First, Acc), With, Index + 1)
end.
-spec index_fold(list(ABE), ABG, fun((integer(), ABE, ABG) -> ABG)) -> ABG.
index_fold(Over, Initial, Fun) ->
do_index_fold(Over, Initial, Fun, 0).
-spec try_fold(list(ABH), ABJ, fun((ABH, ABJ) -> {ok, ABJ} | {error, ABK})) -> {ok,
ABJ} |
{error, ABK}.
try_fold(Collection, Accumulator, Fun) ->
case Collection of
[] ->
{ok, Accumulator};
[First | Rest] ->
case Fun(First, Accumulator) of
{ok, Next_accumulator} ->
try_fold(Rest, Next_accumulator, Fun);
{error, Err} ->
{error, Err}
end
end.
-spec fold_until(list(ABP), ABR, fun((ABP, ABR) -> continue_or_stop(ABR))) -> ABR.
fold_until(Collection, Accumulator, Fun) ->
case Collection of
[] ->
Accumulator;
[First | Rest] ->
case Fun(First, Accumulator) of
{continue, Next_accumulator} ->
fold_until(Rest, Next_accumulator, Fun);
{stop, B} ->
B
end
end.
-spec find(list(ABT), fun((ABT) -> boolean())) -> {ok, ABT} | {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(ABX), fun((ABX) -> {ok, ABZ} | {error, any()})) -> {ok, ABZ} |
{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(ACF), fun((ACF) -> boolean())) -> boolean().
all(List, Predicate) ->
case List of
[] ->
true;
[X | Rest] ->
case Predicate(X) of
true ->
all(Rest, Predicate);
_ ->
false
end
end.
-spec any(list(ACH), fun((ACH) -> boolean())) -> boolean().
any(List, Predicate) ->
case List of
[] ->
false;
[X | Rest] ->
case Predicate(X) of
false ->
any(Rest, Predicate);
_ ->
true
end
end.
-spec zip(list(ACJ), list(ACL)) -> list({ACJ, ACL}).
zip(Xs, Ys) ->
case {Xs, Ys} of
{[], _} ->
[];
{_, []} ->
[];
{[X | Xs@1], [Y | Ys@1]} ->
[{X, Y} | zip(Xs@1, Ys@1)]
end.
-spec strict_zip(list(ACO), list(ACQ)) -> {ok, list({ACO, ACQ})} |
{error, length_mismatch()}.
strict_zip(L1, L2) ->
case erlang:length(L1) =:= erlang:length(L2) of
true ->
{ok, zip(L1, L2)};
false ->
{error, length_mismatch}
end.
-spec do_unzip(list({ACZ, ADA}), list(ACZ), list(ADA)) -> {list(ACZ), list(ADA)}.
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({ACZ, ADA})) -> {list(ACZ), list(ADA)}.
unzip(Input) ->
do_unzip(Input, [], []).
-spec intersperse(list(ADE), ADE) -> list(ADE).
intersperse(List, Elem) ->
case List of
[] ->
List;
[_] ->
List;
[X | Rest] ->
[X, Elem | intersperse(Rest, Elem)]
end.
-spec at(list(ADH), integer()) -> {ok, ADH} | {error, nil}.
at(List, Index) ->
case Index < 0 of
true ->
{error, nil};
false ->
case List of
[] ->
{error, nil};
[X | Rest] ->
case Index =:= 0 of
true ->
{ok, X};
false ->
at(Rest, Index - 1)
end
end
end.
-spec unique(list(ADL)) -> list(ADL).
unique(List) ->
case List of
[] ->
[];
[X | Rest] ->
[X | unique(filter(Rest, fun(Y) -> Y /= X end))]
end.
-spec merge_sort(list(ADO), list(ADO), fun((ADO, ADO) -> gleam@order:order())) -> list(ADO).
merge_sort(A, B, Compare) ->
case {A, B} of
{[], _} ->
B;
{_, []} ->
A;
{[Ax | Ar], [Bx | Br]} ->
case Compare(Ax, Bx) of
lt ->
[Ax | merge_sort(Ar, B, Compare)];
_ ->
[Bx | merge_sort(A, Br, Compare)]
end
end.
-spec do_sort(list(ADS), fun((ADS, ADS) -> gleam@order:order()), integer()) -> list(ADS).
do_sort(List, Compare, List_length) ->
case List_length < 2 of
true ->
List;
false ->
Split_length = List_length div 2,
A_list = take(List, Split_length),
B_list = drop(List, Split_length),
merge_sort(
do_sort(A_list, Compare, Split_length),
do_sort(B_list, Compare, List_length - Split_length),
Compare
)
end.
-spec sort(list(ADV), fun((ADV, ADV) -> gleam@order:order())) -> list(ADV).
sort(List, Compare) ->
do_sort(List, Compare, erlang:length(List)).
-spec range(integer(), integer()) -> list(integer()).
range(Start, Stop) ->
case gleam@int:compare(Start, Stop) of
eq ->
[];
gt ->
[Start | range(Start - 1, Stop)];
lt ->
[Start | range(Start + 1, Stop)]
end.
-spec do_repeat(ADZ, integer(), list(ADZ)) -> list(ADZ).
do_repeat(A, Times, Acc) ->
case Times =< 0 of
true ->
Acc;
false ->
do_repeat(A, Times - 1, [A | Acc])
end.
-spec repeat(AEC, integer()) -> list(AEC).
repeat(A, Times) ->
do_repeat(A, Times, []).
-spec do_split(list(AEE), integer(), list(AEE)) -> {list(AEE), list(AEE)}.
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(AEJ), integer()) -> {list(AEJ), list(AEJ)}.
split(List, Index) ->
do_split(List, Index, []).
-spec do_split_while(list(AEN), fun((AEN) -> boolean()), list(AEN)) -> {list(AEN),
list(AEN)}.
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(AES), fun((AES) -> boolean())) -> {list(AES), list(AES)}.
split_while(List, Predicate) ->
do_split_while(List, Predicate, []).
-spec key_find(list({AEW, AEX}), AEW) -> {ok, AEX} | {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 do_pop(list(AFF), fun((AFF) -> boolean()), list(AFF)) -> {ok,
{AFF, list(AFF)}} |
{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(AFF), fun((AFF) -> boolean())) -> {ok, {AFF, list(AFF)}} |
{error, nil}.
pop(Haystack, Is_desired) ->
do_pop(Haystack, Is_desired, []).
-spec do_pop_map(list(AFO), fun((AFO) -> {ok, AFQ} | {error, any()}), list(AFO)) -> {ok,
{AFQ,
list(AFO)}} |
{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(AFO), fun((AFO) -> {ok, AFQ} | {error, any()})) -> {ok,
{AFQ,
list(AFO)}} |
{error, nil}.
pop_map(Haystack, Is_desired) ->
do_pop_map(Haystack, Is_desired, []).
-spec key_pop(list({AFX, AFY}), AFX) -> {ok, {AFY, list({AFX, AFY})}} |
{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({AGD, AGE}), AGD, AGE) -> list({AGD, AGE}).
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(AGH), fun((AGH) -> any())) -> nil.
each(List, F) ->
case List of
[] ->
nil;
[X | Xs] ->
F(X),
each(Xs, F)
end.
-spec do_partition(list(AGP), fun((AGP) -> boolean()), list(AGP), list(AGP)) -> {list(AGP),
list(AGP)}.
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(AGP), fun((AGP) -> boolean())) -> {list(AGP), list(AGP)}.
partition(List, Categorise) ->
do_partition(List, Categorise, [], []).
-spec permutations(list(AGT)) -> list(list(AGT)).
permutations(L) ->
case L of
[] ->
[[]];
_ ->
flatten(
map(
L,
fun(X) ->
map(
permutations(filter(L, fun(Y) -> Y /= X end)),
fun(Gleam@capture_variable) ->
lists:append([X], Gleam@capture_variable)
end
)
end
)
)
end.
-spec do_window(list(list(AGX)), list(AGX), integer()) -> list(list(AGX)).
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(AHD), integer()) -> list(list(AHD)).
window(L, N) ->
lists:reverse(do_window([], L, N)).
-spec window_by_2(list(AHH)) -> list({AHH, AHH}).
window_by_2(L) ->
zip(L, drop(L, 1)).