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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).



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



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

is_ok(Result) ->

    case Result of

        {error, _@1} ->

            false;



        {ok, _@2} ->

            true

    end.



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

is_error(Result) ->

    case Result of

        {ok, _@1} ->

            false;



        {error, _@2} ->

            true

    end.



-spec map({ok, AMG} | {error, AMH}, fun((AMG) -> AMK)) -> {ok, AMK} |

    {error, AMH}.

map(Result, Fun) ->

    case Result of

        {ok, X} ->

            {ok, Fun(X)};



        {error, E} ->

            {error, E}

    end.



-spec map_error({ok, AMN} | {error, AMO}, fun((AMO) -> AMR)) -> {ok, AMN} |

    {error, AMR}.

map_error(Result, Fun) ->

    case Result of

        {ok, X} ->

            {ok, X};



        {error, Error} ->

            {error, Fun(Error)}

    end.



-spec flatten({ok, {ok, AMU} | {error, AMV}} | {error, AMV}) -> {ok, AMU} |

    {error, AMV}.

flatten(Result) ->

    case Result of

        {ok, X} ->

            X;



        {error, Error} ->

            {error, Error}

    end.



-spec then({ok, ANC} | {error, AND}, fun((ANC) -> {ok, ANG} | {error, AND})) -> {ok,

                                                                                 ANG} |

    {error, AND}.

then(Result, Fun) ->

    case Result of

        {ok, X} ->

            Fun(X);



        {error, E} ->

            {error, E}

    end.



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

unwrap(Result, Default) ->

    case Result of

        {ok, V} ->

            V;



        {error, _@1} ->

            Default

    end.



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

lazy_unwrap(Result, Default) ->

    case Result of

        {ok, V} ->

            V;



        {error, _@1} ->

            Default()

    end.



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

nil_error(Result) ->

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



-spec 'or'({ok, ANZ} | {error, AOA}, {ok, ANZ} | {error, AOA}) -> {ok, ANZ} |

    {error, AOA}.

'or'(First, Second) ->

    case First of

        {ok, _@1} ->

            First;



        {error, _@2} ->

            Second

    end.



-spec lazy_or({ok, AOH} | {error, AOI}, fun(() -> {ok, AOH} | {error, AOI})) -> {ok,

                                                                                 AOH} |

    {error, AOI}.

lazy_or(First, Second) ->

    case First of

        {ok, _@1} ->

            First;



        {error, _@2} ->

            Second()

    end.



-spec all(list({ok, AOP} | {error, AOQ})) -> {ok, list(AOP)} | {error, AOQ}.

all(Results) ->

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



-spec replace_error({ok, AOX} | {error, any()}, APB) -> {ok, AOX} | {error, APB}.

replace_error(Result, Error) ->

    _pipe = Result,

    map_error(_pipe, fun(_) -> Error end).



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

values(Results) ->

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