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gleam_stdlib

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A standard library for the Gleam programming language

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gleam_stdlib src gleam@set.erl
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src/gleam@set.erl 

-module(gleam@set).

-compile([no_auto_import, nowarn_unused_vars, nowarn_unused_function, nowarn_nomatch]).



-export([new/0, size/1, insert/2, contains/2, delete/2, to_list/1, from_list/1, fold/3, filter/2, drop/2, take/2, union/2, intersection/2]).

-export_type([set/1]).



-opaque set(FAG) :: {set, gleam@dict:dict(FAG, list(nil))}.



-spec new() -> set(any()).

new() ->

    {set, gleam@dict:new()}.



-spec size(set(any())) -> integer().

size(Set) ->

    maps:size(erlang:element(2, Set)).



-spec insert(set(FAM), FAM) -> set(FAM).

insert(Set, Member) ->

    {set, gleam@dict:insert(erlang:element(2, Set), Member, [])}.



-spec contains(set(FAP), FAP) -> boolean().

contains(Set, Member) ->

    _pipe = erlang:element(2, Set),

    _pipe@1 = gleam@dict:get(_pipe, Member),

    gleam@result:is_ok(_pipe@1).



-spec delete(set(FAR), FAR) -> set(FAR).

delete(Set, Member) ->

    {set, gleam@dict:delete(erlang:element(2, Set), Member)}.



-spec to_list(set(FAU)) -> list(FAU).

to_list(Set) ->

    gleam@dict:keys(erlang:element(2, Set)).



-spec from_list(list(FAX)) -> set(FAX).

from_list(Members) ->

    Map = gleam@list:fold(

        Members,

        gleam@dict:new(),

        fun(M, K) -> gleam@dict:insert(M, K, []) end

    ),

    {set, Map}.



-spec fold(set(FBA), FBC, fun((FBC, FBA) -> FBC)) -> FBC.

fold(Set, Initial, Reducer) ->

    gleam@dict:fold(

        erlang:element(2, Set),

        Initial,

        fun(A, K, _) -> Reducer(A, K) end

    ).



-spec filter(set(FBD), fun((FBD) -> boolean())) -> set(FBD).

filter(Set, Predicate) ->

    {set,

        gleam@dict:filter(erlang:element(2, Set), fun(M, _) -> Predicate(M) end)}.



-spec drop(set(FBG), list(FBG)) -> set(FBG).

drop(Set, Disallowed) ->

    gleam@list:fold(Disallowed, Set, fun delete/2).



-spec take(set(FBK), list(FBK)) -> set(FBK).

take(Set, Desired) ->

    {set, gleam@dict:take(erlang:element(2, Set), Desired)}.



-spec order(set(FBO), set(FBO)) -> {set(FBO), set(FBO)}.

order(First, Second) ->

    case maps:size(erlang:element(2, First)) > maps:size(

        erlang:element(2, Second)

    ) of

        true ->

            {First, Second};



        false ->

            {Second, First}

    end.



-spec union(set(FBT), set(FBT)) -> set(FBT).

union(First, Second) ->

    {Larger, Smaller} = order(First, Second),

    fold(Smaller, Larger, fun insert/2).



-spec intersection(set(FBX), set(FBX)) -> set(FBX).

intersection(First, Second) ->

    {Larger, Smaller} = order(First, Second),

    take(Larger, to_list(Smaller)).