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-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_fetch/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_tuple/1, decode_list/1, decode_field/2, parse_int/1, parse_float/1]).
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_fetch(Map, Key) ->
case maps:find(Key, Map) of
error -> {error, not_found};
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_tuple(Data = {_, _}) -> {ok, Data};
decode_tuple(Data) -> decode_error_msg("a 2 element tuple", 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, parse_error}
end.
parse_float(String) ->
case string:to_float(binary:bin_to_list(String)) of
{Float, []} ->
{ok, Float};
_ ->
{error, parse_error}
end.
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