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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, BFB} | {error, BFC}, fun((BFB) -> BFF)) -> {ok, BFF} |

    {error, BFC}.

map(Result, Fun) ->

    case Result of

        {ok, X} ->

            {ok, Fun(X)};



        {error, E} ->

            {error, E}

    end.



-spec map_error({ok, BFI} | {error, BFJ}, fun((BFJ) -> BFM)) -> {ok, BFI} |

    {error, BFM}.

map_error(Result, Fun) ->

    case Result of

        {ok, X} ->

            {ok, X};



        {error, Error} ->

            {error, Fun(Error)}

    end.



-spec flatten({ok, {ok, BFP} | {error, BFQ}} | {error, BFQ}) -> {ok, BFP} |

    {error, BFQ}.

flatten(Result) ->

    case Result of

        {ok, X} ->

            X;



        {error, Error} ->

            {error, Error}

    end.



-spec 'try'({ok, BFX} | {error, BFY}, fun((BFX) -> {ok, BGB} | {error, BFY})) -> {ok,

        BGB} |

    {error, BFY}.

'try'(Result, Fun) ->

    case Result of

        {ok, X} ->

            Fun(X);



        {error, E} ->

            {error, E}

    end.



-spec then({ok, BGG} | {error, BGH}, fun((BGG) -> {ok, BGK} | {error, BGH})) -> {ok,

        BGK} |

    {error, BGH}.

then(Result, Fun) ->

    'try'(Result, Fun).



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

unwrap(Result, Default) ->

    case Result of

        {ok, V} ->

            V;



        {error, _} ->

            Default

    end.



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

lazy_unwrap(Result, Default) ->

    case Result of

        {ok, V} ->

            V;



        {error, _} ->

            Default()

    end.



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

unwrap_error(Result, Default) ->

    case Result of

        {ok, _} ->

            Default;



        {error, E} ->

            E

    end.



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

unwrap_both(Result) ->

    case Result of

        {ok, A} ->

            A;



        {error, A@1} ->

            A@1

    end.



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

nil_error(Result) ->

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



-spec 'or'({ok, BHK} | {error, BHL}, {ok, BHK} | {error, BHL}) -> {ok, BHK} |

    {error, BHL}.

'or'(First, Second) ->

    case First of

        {ok, _} ->

            First;



        {error, _} ->

            Second

    end.



-spec lazy_or({ok, BHS} | {error, BHT}, fun(() -> {ok, BHS} | {error, BHT})) -> {ok,

        BHS} |

    {error, BHT}.

lazy_or(First, Second) ->

    case First of

        {ok, _} ->

            First;



        {error, _} ->

            Second()

    end.



-spec all(list({ok, BIA} | {error, BIB})) -> {ok, list(BIA)} | {error, BIB}.

all(Results) ->

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



-spec do_partition(list({ok, BIP} | {error, BIQ}), list(BIP), list(BIQ)) -> {list(BIP),

    list(BIQ)}.

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, BII} | {error, BIJ})) -> {list(BII), list(BIJ)}.

partition(Results) ->

    do_partition(Results, [], []).



-spec replace({ok, any()} | {error, BIY}, BJB) -> {ok, BJB} | {error, BIY}.

replace(Result, Value) ->

    case Result of

        {ok, _} ->

            {ok, Value};



        {error, Error} ->

            {error, Error}

    end.



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

replace_error(Result, Error) ->

    case Result of

        {ok, X} ->

            {ok, X};



        {error, _} ->

            {error, Error}

    end.



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

values(Results) ->

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



-spec try_recover(

    {ok, BJR} | {error, BJS},

    fun((BJS) -> {ok, BJR} | {error, BJV})

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

try_recover(Result, Fun) ->

    case Result of

        {ok, Value} ->

            {ok, Value};



        {error, Error} ->

            Fun(Error)

    end.