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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, replace/2, replace_error/2, values/1, try_recover/2, partition/1]).



-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, BEB} | {error, BEC}, fun((BEB) -> BEF)) -> {ok, BEF} |

    {error, BEC}.

map(Result, Fun) ->

    case Result of

        {ok, X} ->

            {ok, Fun(X)};



        {error, E} ->

            {error, E}

    end.



-spec map_error({ok, BEI} | {error, BEJ}, fun((BEJ) -> BEM)) -> {ok, BEI} |

    {error, BEM}.

map_error(Result, Fun) ->

    case Result of

        {ok, X} ->

            {ok, X};



        {error, Error} ->

            {error, Fun(Error)}

    end.



-spec flatten({ok, {ok, BEP} | {error, BEQ}} | {error, BEQ}) -> {ok, BEP} |

    {error, BEQ}.

flatten(Result) ->

    case Result of

        {ok, X} ->

            X;



        {error, Error} ->

            {error, Error}

    end.



-spec 'try'({ok, BEX} | {error, BEY}, fun((BEX) -> {ok, BFB} | {error, BEY})) -> {ok,

        BFB} |

    {error, BEY}.

'try'(Result, Fun) ->

    case Result of

        {ok, X} ->

            Fun(X);



        {error, E} ->

            {error, E}

    end.



-spec then({ok, BFG} | {error, BFH}, fun((BFG) -> {ok, BFK} | {error, BFH})) -> {ok,

        BFK} |

    {error, BFH}.

then(Result, Fun) ->

    'try'(Result, Fun).



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

unwrap(Result, Default) ->

    case Result of

        {ok, V} ->

            V;



        {error, _} ->

            Default

    end.



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

lazy_unwrap(Result, Default) ->

    case Result of

        {ok, V} ->

            V;



        {error, _} ->

            Default()

    end.



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

unwrap_error(Result, Default) ->

    case Result of

        {ok, _} ->

            Default;



        {error, E} ->

            E

    end.



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

unwrap_both(Result) ->

    case Result of

        {ok, A} ->

            A;



        {error, A@1} ->

            A@1

    end.



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

nil_error(Result) ->

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



-spec 'or'({ok, BGK} | {error, BGL}, {ok, BGK} | {error, BGL}) -> {ok, BGK} |

    {error, BGL}.

'or'(First, Second) ->

    case First of

        {ok, _} ->

            First;



        {error, _} ->

            Second

    end.



-spec lazy_or({ok, BGS} | {error, BGT}, fun(() -> {ok, BGS} | {error, BGT})) -> {ok,

        BGS} |

    {error, BGT}.

lazy_or(First, Second) ->

    case First of

        {ok, _} ->

            First;



        {error, _} ->

            Second()

    end.



-spec all(list({ok, BHA} | {error, BHB})) -> {ok, list(BHA)} | {error, BHB}.

all(Results) ->

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



-spec replace({ok, any()} | {error, BHY}, BIB) -> {ok, BIB} | {error, BHY}.

replace(Result, Value) ->

    case Result of

        {ok, _} ->

            {ok, Value};



        {error, Error} ->

            {error, Error}

    end.



-spec replace_error({ok, BIE} | {error, any()}, BII) -> {ok, BIE} | {error, BII}.

replace_error(Result, Error) ->

    case Result of

        {ok, X} ->

            {ok, X};



        {error, _} ->

            {error, Error}

    end.



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

values(Results) ->

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



-spec try_recover(

    {ok, BIR} | {error, BIS},

    fun((BIS) -> {ok, BIR} | {error, BIV})

) -> {ok, BIR} | {error, BIV}.

try_recover(Result, Fun) ->

    case Result of

        {ok, Value} ->

            {ok, Value};



        {error, Error} ->

            Fun(Error)

    end.



-spec do_partition(list({ok, BHP} | {error, BHQ}), list(BHP), list(BHQ)) -> {list(BHP),

    list(BHQ)}.

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, BHI} | {error, BHJ})) -> {list(BHI), list(BHJ)}.

partition(Results) ->

    do_partition(Results, [], []).