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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, nowarn_unused_function, nowarn_nomatch]).



-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, partition/1, replace/2, replace_error/2, values/1, try_recover/2]).



-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, BIZ} | {error, BJA}, fun((BIZ) -> BJD)) -> {ok, BJD} |

    {error, BJA}.

map(Result, Fun) ->

    case Result of

        {ok, X} ->

            {ok, Fun(X)};



        {error, E} ->

            {error, E}

    end.



-spec map_error({ok, BJG} | {error, BJH}, fun((BJH) -> BJK)) -> {ok, BJG} |

    {error, BJK}.

map_error(Result, Fun) ->

    case Result of

        {ok, X} ->

            {ok, X};



        {error, Error} ->

            {error, Fun(Error)}

    end.



-spec flatten({ok, {ok, BJN} | {error, BJO}} | {error, BJO}) -> {ok, BJN} |

    {error, BJO}.

flatten(Result) ->

    case Result of

        {ok, X} ->

            X;



        {error, Error} ->

            {error, Error}

    end.



-spec 'try'({ok, BJV} | {error, BJW}, fun((BJV) -> {ok, BJZ} | {error, BJW})) -> {ok,

        BJZ} |

    {error, BJW}.

'try'(Result, Fun) ->

    case Result of

        {ok, X} ->

            Fun(X);



        {error, E} ->

            {error, E}

    end.



-spec then({ok, BKE} | {error, BKF}, fun((BKE) -> {ok, BKI} | {error, BKF})) -> {ok,

        BKI} |

    {error, BKF}.

then(Result, Fun) ->

    'try'(Result, Fun).



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

unwrap(Result, Default) ->

    case Result of

        {ok, V} ->

            V;



        {error, _} ->

            Default

    end.



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

lazy_unwrap(Result, Default) ->

    case Result of

        {ok, V} ->

            V;



        {error, _} ->

            Default()

    end.



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

unwrap_error(Result, Default) ->

    case Result of

        {ok, _} ->

            Default;



        {error, E} ->

            E

    end.



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

unwrap_both(Result) ->

    case Result of

        {ok, A} ->

            A;



        {error, A@1} ->

            A@1

    end.



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

nil_error(Result) ->

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



-spec 'or'({ok, BLI} | {error, BLJ}, {ok, BLI} | {error, BLJ}) -> {ok, BLI} |

    {error, BLJ}.

'or'(First, Second) ->

    case First of

        {ok, _} ->

            First;



        {error, _} ->

            Second

    end.



-spec lazy_or({ok, BLQ} | {error, BLR}, fun(() -> {ok, BLQ} | {error, BLR})) -> {ok,

        BLQ} |

    {error, BLR}.

lazy_or(First, Second) ->

    case First of

        {ok, _} ->

            First;



        {error, _} ->

            Second()

    end.



-spec all(list({ok, BLY} | {error, BLZ})) -> {ok, list(BLY)} | {error, BLZ}.

all(Results) ->

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



-spec do_partition(list({ok, BMN} | {error, BMO}), list(BMN), list(BMO)) -> {list(BMN),

    list(BMO)}.

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, BMG} | {error, BMH})) -> {list(BMG), list(BMH)}.

partition(Results) ->

    do_partition(Results, [], []).



-spec replace({ok, any()} | {error, BMW}, BMZ) -> {ok, BMZ} | {error, BMW}.

replace(Result, Value) ->

    case Result of

        {ok, _} ->

            {ok, Value};



        {error, Error} ->

            {error, Error}

    end.



-spec replace_error({ok, BNC} | {error, any()}, BNG) -> {ok, BNC} | {error, BNG}.

replace_error(Result, Error) ->

    case Result of

        {ok, X} ->

            {ok, X};



        {error, _} ->

            {error, Error}

    end.



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

values(Results) ->

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



-spec try_recover(

    {ok, BNP} | {error, BNQ},

    fun((BNQ) -> {ok, BNP} | {error, BNT})

) -> {ok, BNP} | {error, BNT}.

try_recover(Result, Fun) ->

    case Result of

        {ok, Value} ->

            {ok, Value};



        {error, Error} ->

            Fun(Error)

    end.