[redis.git] / client-libraries / erlang / src / proto.erl

-module(proto).

-export([parse/2, parse_int/2, parse_types/2,
	 parse_string/2, stateful_parser/2,
	 single_stateful_parser/2, parse_special/2]).


parse(empty, "+OK") ->
    ok;
parse(empty, "+PONG") ->
    pong;
parse(empty, "0") ->
    false;
parse(empty, "1") ->
    true;
parse(empty, "-1") ->
    {error, no_such_key};
parse(empty, "-2") ->
    {error, wrong_type};
parse(empty, "-3") ->
    {error, same_db};
parse(empty, "-4") ->
    {error, argument_out_of_range};
parse(empty, "-" ++ Message) ->
    {error, Message}.

parse_special(empty, "-1") ->
    parse(empty, "-1");
parse_special(empty, "-2") ->
    parse(empty, "-2");
parse_special(empty, N) ->
    list_to_integer(N).

parse_int(empty, "-ERR " ++ Message) ->
    {error, Message};
parse_int(empty, Value) ->
    list_to_integer(Value).

parse_string(empty, Message) ->
    Message.

parse_types(empty, "none") -> none;
parse_types(empty, "string") -> string;
parse_types(empty, "list") -> list;
parse_types(empty, "set") -> set.


% I'm used when redis returns multiple results
stateful_parser(empty, "nil") ->
    nil;
stateful_parser(error, "-ERR " ++ Error) ->
    {error, Error};
stateful_parser(empty, "-" ++ _ErrorLength) ->
    error;
stateful_parser(empty, NumberOfElements) ->
    {hold, list_to_integer(NumberOfElements)};
stateful_parser(read, ElementSize) ->
    {read, list_to_integer(ElementSize)}.

% I'm used when redis returns just one result
single_stateful_parser(empty, "nil") ->
    nil;
single_stateful_parser(error, "-ERR " ++ Error) ->
    {error, Error};
single_stateful_parser(empty, "-" ++ _ErrorLength) ->
    error;
single_stateful_parser(empty, ElementSize) ->
    {read, list_to_integer(ElementSize)}.
Commit	Line	Data
ed9b544e	1	-module(proto).
	2
	3	-export([parse/2, parse_int/2, parse_types/2,
	4	parse_string/2, stateful_parser/2,
	5	single_stateful_parser/2, parse_special/2]).
	6
	7
	8	parse(empty, "+OK") ->
	9	ok;
	10	parse(empty, "+PONG") ->
	11	pong;
	12	parse(empty, "0") ->
	13	false;
	14	parse(empty, "1") ->
	15	true;
	16	parse(empty, "-1") ->
	17	{error, no_such_key};
	18	parse(empty, "-2") ->
	19	{error, wrong_type};
	20	parse(empty, "-3") ->
	21	{error, same_db};
	22	parse(empty, "-4") ->
	23	{error, argument_out_of_range};
	24	parse(empty, "-" ++ Message) ->
	25	{error, Message}.
	26
	27	parse_special(empty, "-1") ->
	28	parse(empty, "-1");
	29	parse_special(empty, "-2") ->
	30	parse(empty, "-2");
	31	parse_special(empty, N) ->
	32	list_to_integer(N).
	33
	34	parse_int(empty, "-ERR " ++ Message) ->
	35	{error, Message};
	36	parse_int(empty, Value) ->
	37	list_to_integer(Value).
	38
	39	parse_string(empty, Message) ->
	40	Message.
	41
	42	parse_types(empty, "none") -> none;
	43	parse_types(empty, "string") -> string;
	44	parse_types(empty, "list") -> list;
	45	parse_types(empty, "set") -> set.
	46
	47
	48	% I'm used when redis returns multiple results
	49	stateful_parser(empty, "nil") ->
	50	nil;
	51	stateful_parser(error, "-ERR " ++ Error) ->
	52	{error, Error};
	53	stateful_parser(empty, "-" ++ _ErrorLength) ->
	54	error;
	55	stateful_parser(empty, NumberOfElements) ->
	56	{hold, list_to_integer(NumberOfElements)};
	57	stateful_parser(read, ElementSize) ->
	58	{read, list_to_integer(ElementSize)}.
	59
	60	% I'm used when redis returns just one result
	61	single_stateful_parser(empty, "nil") ->
	62	nil;
	63	single_stateful_parser(error, "-ERR " ++ Error) ->
	64	{error, Error};
65	single_stateful_parser(empty, "-" ++ _ErrorLength) ->
66	error;
67	single_stateful_parser(empty, ElementSize) ->
68	{read, list_to_integer(ElementSize)}.