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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@result.erl
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src/gleam@result.erl 

-module(gleam@result).

-compile([no_auto_import, nowarn_unused_vars]).



-export([is_ok/1, is_error/1, map/2, map_error/2, flatten/1, 'try'/2, then/2, unwrap/2, lazy_unwrap/2, unwrap_error/2, unwrap_both/1, nil_error/1, 'or'/2, lazy_or/2, all/1, replace/2, replace_error/2, values/1, partition/1]).



-spec is_ok({ok, any()} | {error, any()}) -> boolean().

is_ok(Result) ->

    case Result of

        {error, _} ->

            false;



        {ok, _} ->

            true

    end.



-spec is_error({ok, any()} | {error, any()}) -> boolean().

is_error(Result) ->

    case Result of

        {ok, _} ->

            false;



        {error, _} ->

            true

    end.



-spec map({ok, BCT} | {error, BCU}, fun((BCT) -> BCX)) -> {ok, BCX} |

    {error, BCU}.

map(Result, Fun) ->

    case Result of

        {ok, X} ->

            {ok, Fun(X)};



        {error, E} ->

            {error, E}

    end.



-spec map_error({ok, BDA} | {error, BDB}, fun((BDB) -> BDE)) -> {ok, BDA} |

    {error, BDE}.

map_error(Result, Fun) ->

    case Result of

        {ok, X} ->

            {ok, X};



        {error, Error} ->

            {error, Fun(Error)}

    end.



-spec flatten({ok, {ok, BDH} | {error, BDI}} | {error, BDI}) -> {ok, BDH} |

    {error, BDI}.

flatten(Result) ->

    case Result of

        {ok, X} ->

            X;



        {error, Error} ->

            {error, Error}

    end.



-spec 'try'({ok, BDP} | {error, BDQ}, fun((BDP) -> {ok, BDT} | {error, BDQ})) -> {ok,

        BDT} |

    {error, BDQ}.

'try'(Result, Fun) ->

    case Result of

        {ok, X} ->

            Fun(X);



        {error, E} ->

            {error, E}

    end.



-spec then({ok, BDY} | {error, BDZ}, fun((BDY) -> {ok, BEC} | {error, BDZ})) -> {ok,

        BEC} |

    {error, BDZ}.

then(Result, Fun) ->

    'try'(Result, Fun).



-spec unwrap({ok, BEH} | {error, any()}, BEH) -> BEH.

unwrap(Result, Default) ->

    case Result of

        {ok, V} ->

            V;



        {error, _} ->

            Default

    end.



-spec lazy_unwrap({ok, BEL} | {error, any()}, fun(() -> BEL)) -> BEL.

lazy_unwrap(Result, Default) ->

    case Result of

        {ok, V} ->

            V;



        {error, _} ->

            Default()

    end.



-spec unwrap_error({ok, any()} | {error, BEQ}, BEQ) -> BEQ.

unwrap_error(Result, Default) ->

    case Result of

        {ok, _} ->

            Default;



        {error, E} ->

            E

    end.



-spec unwrap_both({ok, BET} | {error, BET}) -> BET.

unwrap_both(Result) ->

    case Result of

        {ok, A} ->

            A;



        {error, A@1} ->

            A@1

    end.



-spec nil_error({ok, BEW} | {error, any()}) -> {ok, BEW} | {error, nil}.

nil_error(Result) ->

    map_error(Result, fun(_) -> nil end).



-spec 'or'({ok, BFC} | {error, BFD}, {ok, BFC} | {error, BFD}) -> {ok, BFC} |

    {error, BFD}.

'or'(First, Second) ->

    case First of

        {ok, _} ->

            First;



        {error, _} ->

            Second

    end.



-spec lazy_or({ok, BFK} | {error, BFL}, fun(() -> {ok, BFK} | {error, BFL})) -> {ok,

        BFK} |

    {error, BFL}.

lazy_or(First, Second) ->

    case First of

        {ok, _} ->

            First;



        {error, _} ->

            Second()

    end.



-spec all(list({ok, BFS} | {error, BFT})) -> {ok, list(BFS)} | {error, BFT}.

all(Results) ->

    gleam@list:try_map(Results, fun(X) -> X end).



-spec replace({ok, any()} | {error, BGQ}, BGT) -> {ok, BGT} | {error, BGQ}.

replace(Result, Value) ->

    case Result of

        {ok, _} ->

            {ok, Value};



        {error, Error} ->

            {error, Error}

    end.



-spec replace_error({ok, BGW} | {error, any()}, BHA) -> {ok, BGW} | {error, BHA}.

replace_error(Result, Error) ->

    case Result of

        {ok, X} ->

            {ok, X};



        {error, _} ->

            {error, Error}

    end.



-spec values(list({ok, BHD} | {error, any()})) -> list(BHD).

values(Results) ->

    gleam@list:filter_map(Results, fun(R) -> R end).



-spec do_partition(list({ok, BGH} | {error, BGI}), list(BGH), list(BGI)) -> {list(BGH),

    list(BGI)}.

do_partition(Results, Oks, Errors) ->

    case Results of

        [] ->

            {Oks, Errors};



        [{ok, A} | Rest] ->

            do_partition(Rest, [A | Oks], Errors);



        [{error, E} | Rest@1] ->

            do_partition(Rest@1, Oks, [E | Errors])

    end.



-spec partition(list({ok, BGA} | {error, BGB})) -> {list(BGA), list(BGB)}.

partition(Results) ->

    do_partition(Results, [], []).