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-module(gleam_stdlib).
-include_lib("eunit/include/eunit.hrl").
-export([should_equal/2, should_not_equal/2, should_be_ok/1, should_be_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,
decode_element/2, parse_int/1, parse_float/1, compare_strings/2,
string_pop_grapheme/1, string_starts_with/2, string_ends_with/2,
string_pad/4, decode_tuple2/1, decode_map/1, bit_string_int_to_u32/1,
bit_string_int_from_u32/1, bit_string_append/2, bit_string_part_/3]).
should_equal(Actual, Expected) -> ?assertEqual(Expected, Actual).
should_not_equal(Actual, Expected) -> ?assertNotEqual(Expected, Actual).
should_be_ok(A) -> ?assertMatch({ok, _}, A).
should_be_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 ~s", [Type, classify(Data)]))}.
classify(X) when is_atom(X) -> "an atom";
classify(X) when is_binary(X) -> "a binary";
classify(X) when is_integer(X) -> "an int";
classify(X) when is_float(X) -> "a float";
classify(X) when is_list(X) -> "a list";
classify(X) when is_boolean(X) -> "a bool";
classify(X) when is_function(X, 0) -> "a zero arity function";
classify(X) when is_tuple(X) -> ["a ", integer_to_list(tuple_size(X)), " element tuple"];
classify(_) -> "some other type".
decode_tuple2({_, _} = T) -> {ok, T};
decode_tuple2(Data) -> decode_error_msg("a 2 element tuple", Data).
decode_map(Data) when is_map(Data) -> {ok, Data};
decode_map(Data) -> decode_error_msg("a map", 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.
decode_element(Data, Position) when is_tuple(Data) ->
case catch element(Position + 1, Data) of
{'EXIT', _Reason} ->
decode_error_msg(["a tuple of at least ", integer_to_list(Position + 1), " size"], Data);
Value ->
{ok, Value}
end;
decode_element(Data, _Position) -> decode_error_msg("a tuple", Data).
parse_int(String) ->
case catch binary_to_integer(String) of
Int when is_integer(Int) -> {ok, Int};
_ -> {error, nil}
end.
parse_float(String) ->
case catch binary_to_float(String) of
Float when is_float(Float) -> {ok, Float};
_ -> {error, nil}
end.
compare_strings(Lhs, Rhs) ->
if
Lhs == Rhs ->
eq;
Lhs < Rhs ->
lt;
true ->
gt
end.
string_starts_with(_, <<>>) -> true;
string_starts_with(String, Prefix) when byte_size(Prefix) > byte_size(String) -> false;
string_starts_with(String, Prefix) ->
PrefixSize = byte_size(Prefix),
Prefix == binary_part(String, 0, PrefixSize).
string_ends_with(_, <<>>) -> true;
string_ends_with(String, Suffix) when byte_size(Suffix) > byte_size(String) -> false;
string_ends_with(String, Suffix) ->
SuffixSize = byte_size(Suffix),
Suffix == binary_part(String, byte_size(String) - SuffixSize, SuffixSize).
string_pad(String, Length, Dir, PadString) ->
unicode:characters_to_binary(string:pad(String, Length, Dir, PadString)).
string_pop_grapheme(String) ->
case string:next_grapheme(String) of
[ Next | Rest ] ->
{ok, {unicode:characters_to_binary([Next]), unicode:characters_to_binary(Rest)}};
_ -> {error, nil}
end.
bit_string_append(First, Second) ->
<<First/bitstring, Second/bitstring>>.
bit_string_part_(Bin, Pos, Len) ->
try {ok, binary:part(Bin, Pos, Len)} catch
error:badarg -> {error, nil}
end.
bit_string_int_to_u32(I) when 0 =< I, I < 4294967296 ->
{ok, <<I:32>>};
bit_string_int_to_u32(_) ->
{error, nil}.
bit_string_int_from_u32(<<I:32>>) ->
{ok, I};
bit_string_int_from_u32(_) ->
{error, nil}.
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