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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, BHF} | {error, BHG}, fun((BHF) -> BHJ)) -> {ok, BHJ} |

    {error, BHG}.

map(Result, Fun) ->

    case Result of

        {ok, X} ->

            {ok, Fun(X)};



        {error, E} ->

            {error, E}

    end.



-spec map_error({ok, BHM} | {error, BHN}, fun((BHN) -> BHQ)) -> {ok, BHM} |

    {error, BHQ}.

map_error(Result, Fun) ->

    case Result of

        {ok, X} ->

            {ok, X};



        {error, Error} ->

            {error, Fun(Error)}

    end.



-spec flatten({ok, {ok, BHT} | {error, BHU}} | {error, BHU}) -> {ok, BHT} |

    {error, BHU}.

flatten(Result) ->

    case Result of

        {ok, X} ->

            X;



        {error, Error} ->

            {error, Error}

    end.



-spec 'try'({ok, BIB} | {error, BIC}, fun((BIB) -> {ok, BIF} | {error, BIC})) -> {ok,

        BIF} |

    {error, BIC}.

'try'(Result, Fun) ->

    case Result of

        {ok, X} ->

            Fun(X);



        {error, E} ->

            {error, E}

    end.



-spec then({ok, BIK} | {error, BIL}, fun((BIK) -> {ok, BIO} | {error, BIL})) -> {ok,

        BIO} |

    {error, BIL}.

then(Result, Fun) ->

    'try'(Result, Fun).



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

unwrap(Result, Default) ->

    case Result of

        {ok, V} ->

            V;



        {error, _} ->

            Default

    end.



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

lazy_unwrap(Result, Default) ->

    case Result of

        {ok, V} ->

            V;



        {error, _} ->

            Default()

    end.



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

unwrap_error(Result, Default) ->

    case Result of

        {ok, _} ->

            Default;



        {error, E} ->

            E

    end.



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

unwrap_both(Result) ->

    case Result of

        {ok, A} ->

            A;



        {error, A@1} ->

            A@1

    end.



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

nil_error(Result) ->

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



-spec 'or'({ok, BJO} | {error, BJP}, {ok, BJO} | {error, BJP}) -> {ok, BJO} |

    {error, BJP}.

'or'(First, Second) ->

    case First of

        {ok, _} ->

            First;



        {error, _} ->

            Second

    end.



-spec lazy_or({ok, BJW} | {error, BJX}, fun(() -> {ok, BJW} | {error, BJX})) -> {ok,

        BJW} |

    {error, BJX}.

lazy_or(First, Second) ->

    case First of

        {ok, _} ->

            First;



        {error, _} ->

            Second()

    end.



-spec all(list({ok, BKE} | {error, BKF})) -> {ok, list(BKE)} | {error, BKF}.

all(Results) ->

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



-spec replace({ok, any()} | {error, BLC}, BLF) -> {ok, BLF} | {error, BLC}.

replace(Result, Value) ->

    case Result of

        {ok, _} ->

            {ok, Value};



        {error, Error} ->

            {error, Error}

    end.



-spec replace_error({ok, BLI} | {error, any()}, BLM) -> {ok, BLI} | {error, BLM}.

replace_error(Result, Error) ->

    case Result of

        {ok, X} ->

            {ok, X};



        {error, _} ->

            {error, Error}

    end.



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

values(Results) ->

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



-spec do_partition(list({ok, BKT} | {error, BKU}), list(BKT), list(BKU)) -> {list(BKT),

    list(BKU)}.

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, BKM} | {error, BKN})) -> {list(BKM), list(BKN)}.

partition(Results) ->

    do_partition(Results, [], []).