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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, unwrap_error/2, unwrap_both/1, nil_error/1, 'or'/2, lazy_or/2, all/1, replace/2, 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, CDS} | {error, CDT}, fun((CDS) -> CDW)) -> {ok, CDW} |

    {error, CDT}.

map(Result, Fun) ->

    case Result of

        {ok, X} ->

            {ok, Fun(X)};



        {error, E} ->

            {error, E}

    end.



-spec map_error({ok, CDZ} | {error, CEA}, fun((CEA) -> CED)) -> {ok, CDZ} |

    {error, CED}.

map_error(Result, Fun) ->

    case Result of

        {ok, X} ->

            {ok, X};



        {error, Error} ->

            {error, Fun(Error)}

    end.



-spec flatten({ok, {ok, CEG} | {error, CEH}} | {error, CEH}) -> {ok, CEG} |

    {error, CEH}.

flatten(Result) ->

    case Result of

        {ok, X} ->

            X;



        {error, Error} ->

            {error, Error}

    end.



-spec then({ok, CEO} | {error, CEP}, fun((CEO) -> {ok, CES} | {error, CEP})) -> {ok,

        CES} |

    {error, CEP}.

then(Result, Fun) ->

    case Result of

        {ok, X} ->

            Fun(X);



        {error, E} ->

            {error, E}

    end.



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

unwrap(Result, Default) ->

    case Result of

        {ok, V} ->

            V;



        {error, _@1} ->

            Default

    end.



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

lazy_unwrap(Result, Default) ->

    case Result of

        {ok, V} ->

            V;



        {error, _@1} ->

            Default()

    end.



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

unwrap_error(Result, Default) ->

    case Result of

        {ok, _@1} ->

            Default;



        {error, E} ->

            E

    end.



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

unwrap_both(Result) ->

    case Result of

        {ok, A} ->

            A;



        {error, A@1} ->

            A@1

    end.



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

nil_error(Result) ->

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



-spec 'or'({ok, CFS} | {error, CFT}, {ok, CFS} | {error, CFT}) -> {ok, CFS} |

    {error, CFT}.

'or'(First, Second) ->

    case First of

        {ok, _@1} ->

            First;



        {error, _@2} ->

            Second

    end.



-spec lazy_or({ok, CGA} | {error, CGB}, fun(() -> {ok, CGA} | {error, CGB})) -> {ok,

        CGA} |

    {error, CGB}.

lazy_or(First, Second) ->

    case First of

        {ok, _@1} ->

            First;



        {error, _@2} ->

            Second()

    end.



-spec all(list({ok, CGI} | {error, CGJ})) -> {ok, list(CGI)} | {error, CGJ}.

all(Results) ->

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



-spec replace({ok, any()} | {error, CGR}, CGU) -> {ok, CGU} | {error, CGR}.

replace(Result, Value) ->

    case Result of

        {ok, _@1} ->

            {ok, Value};



        {error, Error} ->

            {error, Error}

    end.



-spec replace_error({ok, CGX} | {error, any()}, CHB) -> {ok, CGX} | {error, CHB}.

replace_error(Result, Error) ->

    case Result of

        {ok, X} ->

            {ok, X};



        {error, _@1} ->

            {error, Error}

    end.



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

values(Results) ->

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