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gleam_stdlib

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A standard library for the Gleam programming language

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

-module(gleam@set).

-compile(no_auto_import).



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

-export_type([set/1]).



-opaque set(CZG) :: {set, gleam@map:map_(CZG, list(nil))}.



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

new() ->

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



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

size(Set) ->

    gleam@map:size(erlang:element(2, Set)).



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

insert(Set, Member) ->

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



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

contains(Set, Member) ->

    gleam@result:is_ok(gleam@map:get(erlang:element(2, Set), Member)).



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

delete(Set, Member) ->

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



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

to_list(Set) ->

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



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

from_list(Members) ->

    Map = gleam@list:fold(

        Members,

        gleam@map:new(),

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

    ),

    {set, Map}.



-spec fold(set(DAF), DAH, fun((DAF, DAH) -> DAH)) -> DAH.

fold(Set, Initial, Reducer) ->

    gleam@map:fold(

        erlang:element(2, Set),

        Initial,

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

    ).



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

filter(Set, Property) ->

    {set,

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



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

take(Set, Desired) ->

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



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

order(First, Second) ->

    case gleam@map:size(erlang:element(2, First))

    > gleam@map:size(erlang:element(2, Second)) of

        true ->

            {First, Second};



        false ->

            {Second, First}

    end.



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

union(First, Second) ->

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

    fold(Smaller, Larger, fun(M, A) -> insert(A, M) end).



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

intersection(First, Second) ->

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

    take(Larger, to_list(Smaller)).