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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]).



-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, BIJ} | {error, BIK}, fun((BIJ) -> BIN)) -> {ok, BIN} |

    {error, BIK}.

map(Result, Fun) ->

    case Result of

        {ok, X} ->

            {ok, Fun(X)};



        {error, E} ->

            {error, E}

    end.



-spec map_error({ok, BIQ} | {error, BIR}, fun((BIR) -> BIU)) -> {ok, BIQ} |

    {error, BIU}.

map_error(Result, Fun) ->

    case Result of

        {ok, X} ->

            {ok, X};



        {error, Error} ->

            {error, Fun(Error)}

    end.



-spec flatten({ok, {ok, BIX} | {error, BIY}} | {error, BIY}) -> {ok, BIX} |

    {error, BIY}.

flatten(Result) ->

    case Result of

        {ok, X} ->

            X;



        {error, Error} ->

            {error, Error}

    end.



-spec 'try'({ok, BJF} | {error, BJG}, fun((BJF) -> {ok, BJJ} | {error, BJG})) -> {ok,

        BJJ} |

    {error, BJG}.

'try'(Result, Fun) ->

    case Result of

        {ok, X} ->

            Fun(X);



        {error, E} ->

            {error, E}

    end.



-spec then({ok, BJO} | {error, BJP}, fun((BJO) -> {ok, BJS} | {error, BJP})) -> {ok,

        BJS} |

    {error, BJP}.

then(Result, Fun) ->

    'try'(Result, Fun).



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

unwrap(Result, Default) ->

    case Result of

        {ok, V} ->

            V;



        {error, _} ->

            Default

    end.



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

lazy_unwrap(Result, Default) ->

    case Result of

        {ok, V} ->

            V;



        {error, _} ->

            Default()

    end.



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

unwrap_error(Result, Default) ->

    case Result of

        {ok, _} ->

            Default;



        {error, E} ->

            E

    end.



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

unwrap_both(Result) ->

    case Result of

        {ok, A} ->

            A;



        {error, A@1} ->

            A@1

    end.



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

nil_error(Result) ->

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



-spec 'or'({ok, BKS} | {error, BKT}, {ok, BKS} | {error, BKT}) -> {ok, BKS} |

    {error, BKT}.

'or'(First, Second) ->

    case First of

        {ok, _} ->

            First;



        {error, _} ->

            Second

    end.



-spec lazy_or({ok, BLA} | {error, BLB}, fun(() -> {ok, BLA} | {error, BLB})) -> {ok,

        BLA} |

    {error, BLB}.

lazy_or(First, Second) ->

    case First of

        {ok, _} ->

            First;



        {error, _} ->

            Second()

    end.



-spec all(list({ok, BLI} | {error, BLJ})) -> {ok, list(BLI)} | {error, BLJ}.

all(Results) ->

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



-spec do_partition(list({ok, BLX} | {error, BLY}), list(BLX), list(BLY)) -> {list(BLX),

    list(BLY)}.

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, BLQ} | {error, BLR})) -> {list(BLQ), list(BLR)}.

partition(Results) ->

    do_partition(Results, [], []).



-spec replace({ok, any()} | {error, BMG}, BMJ) -> {ok, BMJ} | {error, BMG}.

replace(Result, Value) ->

    case Result of

        {ok, _} ->

            {ok, Value};



        {error, Error} ->

            {error, Error}

    end.



-spec replace_error({ok, BMM} | {error, any()}, BMQ) -> {ok, BMM} | {error, BMQ}.

replace_error(Result, Error) ->

    case Result of

        {ok, X} ->

            {ok, X};



        {error, _} ->

            {error, Error}

    end.



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

values(Results) ->

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



-spec try_recover(

    {ok, BMZ} | {error, BNA},

    fun((BNA) -> {ok, BMZ} | {error, BND})

) -> {ok, BMZ} | {error, BND}.

try_recover(Result, Fun) ->

    case Result of

        {ok, Value} ->

            {ok, Value};



        {error, Error} ->

            Fun(Error)

    end.