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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@bit_string.erl
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src/gleam@bit_string.erl 

-module(gleam@bit_string).

-compile(no_auto_import).



-export([from_string/1, byte_size/1, append/2, slice/3, is_utf8/1, to_string/1, concat/1]).



-spec from_string(binary()) -> bitstring().

from_string(X) ->

    gleam_stdlib:identity(X).



-spec byte_size(bitstring()) -> integer().

byte_size(X) ->

    erlang:byte_size(X).



-spec append(bitstring(), bitstring()) -> bitstring().

append(First, Second) ->

    concat([First, Second]).



-spec slice(bitstring(), integer(), integer()) -> {ok, bitstring()} |

    {error, nil}.

slice(String, Position, Length) ->

    gleam_stdlib:bit_string_slice(String, Position, Length).



-spec is_utf8(bitstring()) -> boolean().

is_utf8(Bits) ->

    do_is_utf8(Bits).



-spec do_is_utf8(bitstring()) -> boolean().

do_is_utf8(Bits) ->

    case Bits of

        <<>> ->

            true;



        <<_@1/utf8, Rest/binary>> ->

            is_utf8(Rest);



        _@2 ->

            false

    end.



-spec to_string(bitstring()) -> {ok, binary()} | {error, nil}.

to_string(Bits) ->

    do_to_string(Bits).



-spec do_to_string(bitstring()) -> {ok, binary()} | {error, nil}.

do_to_string(Bits) ->

    case is_utf8(Bits) of

        true ->

            {ok, gleam_stdlib:identity(Bits)};



        false ->

            {error, nil}

    end.



-spec concat(list(bitstring())) -> bitstring().

concat(Bit_strings) ->

    gleam_stdlib:bit_string_concat(Bit_strings).