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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_stdlib.erl
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src/gleam_stdlib.erl 

-module(gleam_stdlib).

-include_lib("eunit/include/eunit.hrl").



-export([expect_equal/2, expect_not_equal/2, expect_true/1, expect_false/1,

         expect_is_ok/1, expect_is_error/1, atom_from_string/1,

         atom_create_from_string/1, atom_to_string/1, map_get/2,

         iodata_append/2, iodata_prepend/2, identity/1, decode_int/1,

         decode_string/1, decode_bool/1, decode_float/1, decode_thunk/1, decode_atom/1,

         decode_list/1, decode_field/2, parse_int/1, parse_float/1, compare_strings/2]).



expect_equal(Actual, Expected) -> ?assertEqual(Expected, Actual).

expect_not_equal(Actual, Expected) -> ?assertNotEqual(Expected, Actual).

expect_true(A) -> ?assert(A).

expect_false(A) -> ?assertNot(A).

expect_is_ok(A) -> ?assertMatch({ok, _}, A).

expect_is_error(A) -> ?assertMatch({error, _}, A).



map_get(Map, Key) ->

  case maps:find(Key, Map) of

    error -> {error, nil};

    OkFound -> OkFound

  end.



atom_create_from_string(S) ->

  binary_to_atom(S, utf8).



atom_to_string(S) ->

  atom_to_binary(S, utf8).



atom_from_string(S) ->

  try {ok, binary_to_existing_atom(S, utf8)} catch

    error:badarg -> {error, atom_not_loaded}

  end.



iodata_append(Iodata, String) -> [Iodata, String].

iodata_prepend(Iodata, String) -> [String, Iodata].



identity(X) -> X.



decode_error_msg(Type, Data) ->

  {error, iolist_to_binary(io_lib:format("Expected ~s, got `~p`", [Type, Data]))}.



decode_atom(Data) when is_atom(Data) -> {ok, Data};

decode_atom(Data) -> decode_error_msg("an Atom", Data).



decode_string(Data) when is_binary(Data) -> {ok, Data};

decode_string(Data) -> decode_error_msg("a String", Data).



decode_int(Data) when is_integer(Data) -> {ok, Data};

decode_int(Data) -> decode_error_msg("an Int", Data).



decode_float(Data) when is_float(Data) -> {ok, Data};

decode_float(Data) -> decode_error_msg("a Float", Data).



decode_bool(Data) when is_boolean(Data) -> {ok, Data};

decode_bool(Data) -> decode_error_msg("a Bool", Data).



decode_thunk(Data) when is_function(Data, 0) -> {ok, Data};

decode_thunk(Data) -> decode_error_msg("a zero arity function", Data).



decode_list(Data) when is_list(Data) -> {ok, Data};

decode_list(Data) -> decode_error_msg("a List", Data).



decode_field(Data, Key) ->

  case Data of

    #{Key := Value} ->

      {ok, Value};



    _ ->

      decode_error_msg(io_lib:format("a map with key `~p`", [Key]), Data)

  end.



parse_int(String) ->

  case string:to_integer(binary:bin_to_list(String)) of

    {Integer, []} ->

      {ok, Integer};



    _ ->

      {error, nil}

  end.



parse_float(String) ->

  case string:to_float(binary:bin_to_list(String)) of

    {Float, []} ->

      {ok, Float};



    _ ->

      {error, nil}

  end.



compare_strings(Lhs, Rhs) ->

  if

    Lhs == Rhs ->

      eq;

    Lhs < Rhs ->

      lt;

    true ->

     gt

  end.