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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,
map_get/2, iodata_append/2, identity/1, decode_int/1, decode_bool/1,
decode_float/1, decode_thunk/1, decode_list/1, decode_optional/2,
decode_field/2, decode_element/2, parse_int/1, parse_float/1,
less_than/2, string_pop_grapheme/1, string_starts_with/2, wrap_list/1,
string_ends_with/2, string_pad/4, decode_tuple2/1, decode_tuple3/1,
decode_tuple4/1, decode_tuple5/1, decode_tuple6/1, decode_map/1,
bit_string_int_to_u32/1, bit_string_int_from_u32/1, decode_result/1,
bit_string_slice/3, decode_bit_string/1, compile_regex/2,
regex_check/2, regex_split/2, regex_scan/2, base_decode64/1,
parse_query/1, bit_string_concat/1]).
should_equal(Actual, Expected) ->
?assertEqual(Expected, Actual),
nil.
should_not_equal(Actual, Expected) ->
?assertNotEqual(Expected, Actual),
nil.
should_be_ok(A) ->
?assertMatch({ok, _}, A),
nil.
should_be_error(A) ->
?assertMatch({error, _}, A),
nil.
map_get(Map, Key) ->
case maps:find(Key, Map) of
error -> {error, nil};
OkFound -> OkFound
end.
iodata_append(Iodata, String) -> [Iodata, String].
identity(X) -> X.
decode_error_msg(Expected, Data) ->
{error, {decode_error, Expected, classify(Data)}}.
classify(X) when is_atom(X) -> <<"Atom">>;
classify(X) when is_binary(X) -> <<"String">>;
classify(X) when is_bitstring(X) -> <<"BitString">>;
classify(X) when is_integer(X) -> <<"Int">>;
classify(X) when is_float(X) -> <<"Float">>;
classify(X) when is_list(X) -> <<"List">>;
classify(X) when is_boolean(X) -> <<"Bool">>;
classify(X) when is_function(X, 0) -> <<"zero arity function">>;
classify(X) when is_tuple(X) -> iolist_to_binary([integer_to_list(tuple_size(X)), " element tuple"]);
classify(_) -> "some other type".
decode_tuple2({_, _} = T) -> {ok, T};
decode_tuple2(Data) -> decode_error_msg(<<"2 element tuple">>, Data).
decode_tuple3({_, _, _} = T) -> {ok, T};
decode_tuple3(Data) -> decode_error_msg(<<"3 element tuple">>, Data).
decode_tuple4({_, _, _, _} = T) -> {ok, T};
decode_tuple4(Data) -> decode_error_msg(<<"4 element tuple">>, Data).
decode_tuple5({_, _, _, _, _} = T) -> {ok, T};
decode_tuple5(Data) -> decode_error_msg(<<"5 element tuple">>, Data).
decode_tuple6({_, _, _, _, _, _} = T) -> {ok, T};
decode_tuple6(Data) -> decode_error_msg(<<"6 element tuple">>, Data).
decode_map(Data) when is_map(Data) -> {ok, Data};
decode_map(Data) -> decode_error_msg(<<"Map">>, Data).
decode_bit_string(Data) when is_bitstring(Data) -> {ok, Data};
decode_bit_string(Data) -> decode_error_msg(<<"BitString">>, Data).
decode_int(Data) when is_integer(Data) -> {ok, Data};
decode_int(Data) -> decode_error_msg(<<"Int">>, Data).
decode_float(Data) when is_float(Data) -> {ok, Data};
decode_float(Data) -> decode_error_msg(<<"Float">>, Data).
decode_bool(Data) when is_boolean(Data) -> {ok, Data};
decode_bool(Data) -> decode_error_msg(<<"Bool">>, Data).
decode_thunk(Data) when is_function(Data, 0) -> {ok, Data};
decode_thunk(Data) -> decode_error_msg("zero arity function", Data).
decode_list(Data) when is_list(Data) -> {ok, Data};
decode_list(Data) -> decode_error_msg(<<"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(<<"Tuple">>, Data).
decode_optional(Term, F) ->
Decode = fun(Inner) ->
case F(Inner) of
{ok, Decoded} -> {ok, {some, Decoded}};
Error -> Error
end
end,
case Term of
undefined -> {ok, none};
error -> {ok, none};
null -> {ok, none};
none -> {ok, none};
nil -> {ok, none};
{some, Inner} -> Decode(Inner);
_ -> Decode(Term)
end.
decode_result(Term) ->
case Term of
{ok, Inner} -> {ok, {ok, Inner}};
ok -> {ok, {ok, nil}};
{error, Inner} -> {ok, {error, Inner}};
error -> {ok, {error, nil}};
_ -> decode_error_msg(<<"result tuple">>, Term)
end.
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.
less_than(Lhs, Rhs) ->
Lhs < Rhs.
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) ->
Chars = string:pad(String, Length, Dir, binary_to_list(PadString)),
case unicode:characters_to_binary(Chars) of
Bin when is_binary(Bin) -> Bin;
Error -> erlang:error({gleam_error, {string_invalid_utf8, Error}})
end.
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_concat(BitStrings) ->
iolist_to_binary(BitStrings).
bit_string_slice(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}.
compile_regex(String, Options) ->
{options, Caseless, Multiline} = Options,
OptionsList = [
unicode,
Caseless andalso caseless,
Multiline andalso multiline
],
FilteredOptions = [Option || Option <- OptionsList, Option /= false],
case re:compile(String, FilteredOptions) of
{ok, MP} -> {ok, MP};
{error, {Str, Pos}} ->
{error, {compile_error, unicode:characters_to_binary(Str), Pos}}
end.
regex_check(Regex, String) ->
re:run(String, Regex) /= nomatch.
regex_split(Regex, String) ->
re:split(String, Regex).
regex_submatches(String, {S, L}) ->
SubMatch = string:slice(String, S, L),
case string:is_empty(SubMatch) of
true -> none;
false -> {some, SubMatch}
end.
regex_matches(String, [{S, L} | Submatches]) ->
Submatches1 = lists:map(fun(X) -> regex_submatches(String, X) end, Submatches),
{match, binary:part(String, S, L), Submatches1}.
regex_scan(Regex, String) ->
case re:run(String, Regex, [global]) of
{match, Captured} -> lists:map(fun(X) -> regex_matches(String, X) end, Captured);
nomatch -> []
end.
base_decode64(S) ->
try {ok, base64:decode(S)}
catch error:badarith -> {error, nil}
end.
wrap_list(X) when is_list(X) -> X;
wrap_list(X) -> [X].
parse_query(Query) ->
case uri_string:dissect_query(Query) of
{error, _, _} -> {error, nil};
Pairs ->
Pairs1 = lists:map(fun
({K, true}) -> {K, <<"">>};
(Pair) -> Pair
end, Pairs),
{ok, Pairs1}
end.
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