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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, 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, BFF} | {error, BFG}, fun((BFF) -> BFJ)) -> {ok, BFJ} |

    {error, BFG}.

map(Result, Fun) ->

    case Result of

        {ok, X} ->

            {ok, Fun(X)};



        {error, E} ->

            {error, E}

    end.



-spec map_error({ok, BFM} | {error, BFN}, fun((BFN) -> BFQ)) -> {ok, BFM} |

    {error, BFQ}.

map_error(Result, Fun) ->

    case Result of

        {ok, X} ->

            {ok, X};



        {error, Error} ->

            {error, Fun(Error)}

    end.



-spec flatten({ok, {ok, BFT} | {error, BFU}} | {error, BFU}) -> {ok, BFT} |

    {error, BFU}.

flatten(Result) ->

    case Result of

        {ok, X} ->

            X;



        {error, Error} ->

            {error, Error}

    end.



-spec 'try'({ok, BGB} | {error, BGC}, fun((BGB) -> {ok, BGF} | {error, BGC})) -> {ok,

        BGF} |

    {error, BGC}.

'try'(Result, Fun) ->

    case Result of

        {ok, X} ->

            Fun(X);



        {error, E} ->

            {error, E}

    end.



-spec then({ok, BGK} | {error, BGL}, fun((BGK) -> {ok, BGO} | {error, BGL})) -> {ok,

        BGO} |

    {error, BGL}.

then(Result, Fun) ->

    'try'(Result, Fun).



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

unwrap(Result, Default) ->

    case Result of

        {ok, V} ->

            V;



        {error, _} ->

            Default

    end.



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

lazy_unwrap(Result, Default) ->

    case Result of

        {ok, V} ->

            V;



        {error, _} ->

            Default()

    end.



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

unwrap_error(Result, Default) ->

    case Result of

        {ok, _} ->

            Default;



        {error, E} ->

            E

    end.



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

unwrap_both(Result) ->

    case Result of

        {ok, A} ->

            A;



        {error, A@1} ->

            A@1

    end.



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

nil_error(Result) ->

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



-spec 'or'({ok, BHO} | {error, BHP}, {ok, BHO} | {error, BHP}) -> {ok, BHO} |

    {error, BHP}.

'or'(First, Second) ->

    case First of

        {ok, _} ->

            First;



        {error, _} ->

            Second

    end.



-spec lazy_or({ok, BHW} | {error, BHX}, fun(() -> {ok, BHW} | {error, BHX})) -> {ok,

        BHW} |

    {error, BHX}.

lazy_or(First, Second) ->

    case First of

        {ok, _} ->

            First;



        {error, _} ->

            Second()

    end.



-spec all(list({ok, BIE} | {error, BIF})) -> {ok, list(BIE)} | {error, BIF}.

all(Results) ->

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



-spec do_partition(list({ok, BIT} | {error, BIU}), list(BIT), list(BIU)) -> {list(BIT),

    list(BIU)}.

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, BIM} | {error, BIN})) -> {list(BIM), list(BIN)}.

partition(Results) ->

    do_partition(Results, [], []).



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

replace(Result, Value) ->

    case Result of

        {ok, _} ->

            {ok, Value};



        {error, Error} ->

            {error, Error}

    end.



-spec replace_error({ok, BJI} | {error, any()}, BJM) -> {ok, BJI} | {error, BJM}.

replace_error(Result, Error) ->

    case Result of

        {ok, X} ->

            {ok, X};



        {error, _} ->

            {error, Error}

    end.



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

values(Results) ->

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



-spec try_recover(

    {ok, BJV} | {error, BJW},

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

) -> {ok, BJV} | {error, BJZ}.

try_recover(Result, Fun) ->

    case Result of

        {ok, Value} ->

            {ok, Value};



        {error, Error} ->

            Fun(Error)

    end.