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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, AHW} | {error, AHX}, fun((AHW) -> AIA)) -> {ok, AIA} |

    {error, AHX}.

map(Result, Fun) ->

    case Result of

        {ok, X} ->

            {ok, Fun(X)};



        {error, E} ->

            {error, E}

    end.



-spec map_error({ok, AID} | {error, AIE}, fun((AIE) -> AIH)) -> {ok, AID} |

    {error, AIH}.

map_error(Result, Fun) ->

    case Result of

        {ok, X} ->

            {ok, X};



        {error, Error} ->

            {error, Fun(Error)}

    end.



-spec flatten({ok, {ok, AIK} | {error, AIL}} | {error, AIL}) -> {ok, AIK} |

    {error, AIL}.

flatten(Result) ->

    case Result of

        {ok, X} ->

            X;



        {error, Error} ->

            {error, Error}

    end.



-spec then({ok, AIS} | {error, AIT}, fun((AIS) -> {ok, AIW} | {error, AIT})) -> {ok,

                                                                                 AIW} |

    {error, AIT}.

then(Result, Fun) ->

    case Result of

        {ok, X} ->

            Fun(X);



        {error, E} ->

            {error, E}

    end.



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

unwrap(Result, Default) ->

    case Result of

        {ok, V} ->

            V;



        {error, _@1} ->

            Default

    end.



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

lazy_unwrap(Result, Default) ->

    case Result of

        {ok, V} ->

            V;



        {error, _@1} ->

            Default()

    end.



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

nil_error(Result) ->

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



-spec 'or'({ok, AJP} | {error, AJQ}, {ok, AJP} | {error, AJQ}) -> {ok, AJP} |

    {error, AJQ}.

'or'(First, Second) ->

    case First of

        {ok, _@1} ->

            First;



        {error, _@2} ->

            Second

    end.



-spec lazy_or({ok, AJX} | {error, AJY}, fun(() -> {ok, AJX} | {error, AJY})) -> {ok,

                                                                                 AJX} |

    {error, AJY}.

lazy_or(First, Second) ->

    case First of

        {ok, _@1} ->

            First;



        {error, _@2} ->

            Second()

    end.



-spec all(list({ok, AKF} | {error, AKG})) -> {ok, list(AKF)} | {error, AKG}.

all(Results) ->

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



-spec replace_error({ok, AKN} | {error, any()}, AKR) -> {ok, AKN} | {error, AKR}.

replace_error(Result, Error) ->

    _pipe = Result,

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



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

values(Results) ->

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