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A standard library for the Gleam programming language

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gleam_stdlib src gleam@queue.erl
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src/gleam@queue.erl 

-module(gleam@queue).

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



-export([new/0, from_list/1, to_list/1, is_empty/1, length/1, push_back/2, push_front/2, pop_back/1, pop_front/1, reverse/1, is_logically_equal/3, is_equal/2]).

-export_type([queue/1]).



-opaque queue(EXL) :: {queue, list(EXL), list(EXL)}.



-file("/Users/louis/src/gleam/stdlib/src/gleam/queue.gleam", 22).

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

new() ->

    {queue, [], []}.



-file("/Users/louis/src/gleam/stdlib/src/gleam/queue.gleam", 38).

-spec from_list(list(EXO)) -> queue(EXO).

from_list(List) ->

    {queue, [], List}.



-file("/Users/louis/src/gleam/stdlib/src/gleam/queue.gleam", 54).

-spec to_list(queue(EXR)) -> list(EXR).

to_list(Queue) ->

    _pipe = erlang:element(3, Queue),

    lists:append(_pipe, lists:reverse(erlang:element(2, Queue))).



-file("/Users/louis/src/gleam/stdlib/src/gleam/queue.gleam", 80).

-spec is_empty(queue(any())) -> boolean().

is_empty(Queue) ->

    (erlang:element(2, Queue) =:= []) andalso (erlang:element(3, Queue) =:= []).



-file("/Users/louis/src/gleam/stdlib/src/gleam/queue.gleam", 106).

-spec length(queue(any())) -> integer().

length(Queue) ->

    erlang:length(erlang:element(2, Queue)) + erlang:length(

        erlang:element(3, Queue)

    ).



-file("/Users/louis/src/gleam/stdlib/src/gleam/queue.gleam", 119).

-spec push_back(queue(EXY), EXY) -> queue(EXY).

push_back(Queue, Item) ->

    {queue, [Item | erlang:element(2, Queue)], erlang:element(3, Queue)}.



-file("/Users/louis/src/gleam/stdlib/src/gleam/queue.gleam", 132).

-spec push_front(queue(EYB), EYB) -> queue(EYB).

push_front(Queue, Item) ->

    {queue, erlang:element(2, Queue), [Item | erlang:element(3, Queue)]}.



-file("/Users/louis/src/gleam/stdlib/src/gleam/queue.gleam", 164).

-spec pop_back(queue(EYE)) -> {ok, {EYE, queue(EYE)}} | {error, nil}.

pop_back(Queue) ->

    case Queue of

        {queue, [], []} ->

            {error, nil};



        {queue, [], Out} ->

            pop_back({queue, lists:reverse(Out), []});



        {queue, [First | Rest], Out@1} ->

            Queue@1 = {queue, Rest, Out@1},

            {ok, {First, Queue@1}}

    end.



-file("/Users/louis/src/gleam/stdlib/src/gleam/queue.gleam", 203).

-spec pop_front(queue(EYJ)) -> {ok, {EYJ, queue(EYJ)}} | {error, nil}.

pop_front(Queue) ->

    case Queue of

        {queue, [], []} ->

            {error, nil};



        {queue, In, []} ->

            pop_front({queue, [], lists:reverse(In)});



        {queue, In@1, [First | Rest]} ->

            Queue@1 = {queue, In@1, Rest},

            {ok, {First, Queue@1}}

    end.



-file("/Users/louis/src/gleam/stdlib/src/gleam/queue.gleam", 236).

-spec reverse(queue(EYO)) -> queue(EYO).

reverse(Queue) ->

    {queue, erlang:element(3, Queue), erlang:element(2, Queue)}.



-file("/Users/louis/src/gleam/stdlib/src/gleam/queue.gleam", 259).

-spec check_equal(

    list(EYU),

    list(EYU),

    list(EYU),

    list(EYU),

    fun((EYU, EYU) -> boolean())

) -> boolean().

check_equal(Xs, X_tail, Ys, Y_tail, Eq) ->

    case {Xs, X_tail, Ys, Y_tail} of

        {[], [], [], []} ->

            true;



        {[X | Xs@1], _, [Y | Ys@1], _} ->

            case Eq(X, Y) of

                false ->

                    false;



                true ->

                    check_equal(Xs@1, X_tail, Ys@1, Y_tail, Eq)

            end;



        {[], [_ | _], _, _} ->

            check_equal(lists:reverse(X_tail), [], Ys, Y_tail, Eq);



        {_, _, [], [_ | _]} ->

            check_equal(Xs, X_tail, lists:reverse(Y_tail), [], Eq);



        {_, _, _, _} ->

            false

    end.



-file("/Users/louis/src/gleam/stdlib/src/gleam/queue.gleam", 251).

-spec is_logically_equal(queue(EYR), queue(EYR), fun((EYR, EYR) -> boolean())) -> boolean().

is_logically_equal(A, B, Element_is_equal) ->

    check_equal(

        erlang:element(3, A),

        erlang:element(2, A),

        erlang:element(3, B),

        erlang:element(2, B),

        Element_is_equal

    ).



-file("/Users/louis/src/gleam/stdlib/src/gleam/queue.gleam", 288).

-spec is_equal(queue(EYZ), queue(EYZ)) -> boolean().

is_equal(A, B) ->

    check_equal(

        erlang:element(3, A),

        erlang:element(2, A),

        erlang:element(3, B),

        erlang:element(2, B),

        fun(A@1, B@1) -> A@1 =:= B@1 end

    ).