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-module(corerl).
-export([parse/1,
content_format_number/1,
content_format_type/1]).
-include("corerl.hrl").
content_formats() ->
[{"text/plain;charset=utf-8", 0},
% shortcut for the above
{"text/plain", 0},
{"application/link-format", 40},
{"application/xml", 41},
{"application/octext-stream", 42},
{"application/exi", 47},
{"application/json", 50}].
content_format_number(ContentFormat) ->
proplists:get_value(ContentFormat, content_formats()).
content_format_type(Number) ->
list_to_binary(proplists:get_value(Number,
[{N,F} || {F,N} <- content_formats()]
)).
-spec parse(<<>>) -> list(#core_link{}).
% @doc: parse a core message
parse(Data) ->
parse_link_values(binary:split(Data, <<",">>, [global]), []).
parse_link_values([LinkValue|T], Acc) ->
Link = parse_link_value(LinkValue),
parse_link_values(T, [Link|Acc]);
parse_link_values([], Acc) ->
Acc.
parse_link_value(<<$<, Data/binary>>) ->
[Value, Params] = binary:split(Data, <<$>>>),
parse_link_params(binary:split(Params, <<$;>>, [global]), #core_link{uri=Value}).
parse_link_params([LinkParam|T], Rec) ->
NewRec = case binary:split(LinkParam, <<$=>>, [global]) of
[<<"title">>, V] ->
Rec#core_link{title=V};
[<<"ct">>, V] ->
Rec#core_link{ct=content_format_type(binary_to_integer(V))};
[<<"rt">>, V] ->
Rec#core_link{rt=V};
[<<"if">>, V] ->
Rec#core_link{'if'=V};
_ -> Rec
end,
parse_link_params(T, NewRec);
parse_link_params([], Rec) ->
Rec.
-ifdef(TEST).
-include_lib("eunit/include/eunit.hrl").
parse_link_values_test() ->
Data = <<"</>;title=\"General Info\";ct=0,</time>;if=\"clock\";rt=\"Ticks\";title=\"Internal Clock\";ct=0;obs,</async>;ct=50">>,
?assertEqual(parse(Data),
[{core_link,<<"/async">>,undefined,undefined,undefined,<<"application/json">>,undefined},
{core_link,<<"/time">>,<<"\"Internal Clock\"">>,undefined,<<"\"Ticks\"">>, <<"text/plain;charset=utf-8">>,<<"\"clock\"">>},
{core_link,<<"/">>,<<"\"General Info\"">>,undefined,undefined,<<"text/plain;charset=utf-8">>,undefined}
]).
-endif.
|
