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gleam_stdlib

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A standard library for the Gleam programming language

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gleam_stdlib gen src gleam@result.erl
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gen/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, nil_error/1, 'or'/2, lazy_or/2, all/1, replace_error/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, BUC} | {error, BUD}, fun((BUC) -> BUG)) -> {ok, BUG} |

    {error, BUD}.

map(Result, Fun) ->

    case Result of

        {ok, X} ->

            {ok, Fun(X)};



        {error, E} ->

            {error, E}

    end.



-spec map_error({ok, BUJ} | {error, BUK}, fun((BUK) -> BUN)) -> {ok, BUJ} |

    {error, BUN}.

map_error(Result, Fun) ->

    case Result of

        {ok, X} ->

            {ok, X};



        {error, Error} ->

            {error, Fun(Error)}

    end.



-spec flatten({ok, {ok, BUQ} | {error, BUR}} | {error, BUR}) -> {ok, BUQ} |

    {error, BUR}.

flatten(Result) ->

    case Result of

        {ok, X} ->

            X;



        {error, Error} ->

            {error, Error}

    end.



-spec then({ok, BUY} | {error, BUZ}, fun((BUY) -> {ok, BVC} | {error, BUZ})) -> {ok,

                                                                                 BVC} |

    {error, BUZ}.

then(Result, Fun) ->

    case Result of

        {ok, X} ->

            Fun(X);



        {error, E} ->

            {error, E}

    end.



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

unwrap(Result, Default) ->

    case Result of

        {ok, V} ->

            V;



        {error, _} ->

            Default

    end.



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

lazy_unwrap(Result, Default) ->

    case Result of

        {ok, V} ->

            V;



        {error, _} ->

            Default()

    end.



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

nil_error(Result) ->

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



-spec 'or'({ok, BVV} | {error, BVW}, {ok, BVV} | {error, BVW}) -> {ok, BVV} |

    {error, BVW}.

'or'(First, Second) ->

    case First of

        {ok, _} ->

            First;



        {error, _} ->

            Second

    end.



-spec lazy_or({ok, BWD} | {error, BWE}, fun(() -> {ok, BWD} | {error, BWE})) -> {ok,

                                                                                 BWD} |

    {error, BWE}.

lazy_or(First, Second) ->

    case First of

        {ok, _} ->

            First;



        {error, _} ->

            Second()

    end.



-spec all(list({ok, BWL} | {error, BWM})) -> {ok, list(BWL)} | {error, BWM}.

all(Results) ->

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



-spec replace_error({ok, BWT} | {error, any()}, BWX) -> {ok, BWT} | {error, BWX}.

replace_error(Result, Error) ->

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