[erlang-questions] UBF and JSON Protocols

Joseph Wayne Norton <>
Sun Feb 15 15:30:46 CET 2009


Joe -

Using the decoder/encoder of the erlang-rfc46267  
(http://www.lshift.net/blog/2007/02/17/json-and-json-rpc-for-erlang)  
module, here is an informal description for *one* approach to encode  
"erlang" UBF into JSON (and vice versa).   Comments and feedback are  
welcome.

thanks,

- Joe N.


%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% encode(ubf::value()) -> json::value()
%%

%% ubf::tuple() = {obj, [{"$T", ubf::list()}]}
%%
%% ubf::list() = [value()]
%%
%% ubf::number() = integer() | float()
%%
%% ubf::string() = {obj, [{"$S", binary()}]}
%%
%% ubf::binary() = binary()
%%
%% ubf::true() = true
%% ubf::false() = false
%% ubf::undefined() = null
%%
%% ubf::atom() = {obj, [{"$A", atomname()}
%%      atomname() = binary()  % a.k.a. list_to_binary(atom_to_list()) for  
the actual atom
%%
%% ubf::record() = {obj, [{"$R", recordname()}] ++ [recordpair()]}
%%      recordname = binary()  % a.k.a. list_to_binary(atom_to_list()) for  
the record's name
%%      recordpair() = {recordkey(), value()}
%%      recordkey() = binary()  % a.k.a. list_to_binary(atom_to_list())  
for the record key's name
%%
%% value() = ubf::tuple() | ubf::list() | ubf::number() | ubf::string() |  
ubf::binary() | ubf::true() | ubf::false() | ubf::undefined() |  
ubf::atom() | ubf::record()



%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% ubf
%%

%% ubf::tuple() = tuple()
%%
%% ubf::list() = list()
%%
%% ubf::number = integer() | float()
%%
%% ubf::string() = {'$S', [integer()]}
%%
%% ubf::binary() = binary()
%%
%% ubf::true() = true
%% ubf::false() = false
%% ubf::undefined() = undefined
%%
%% ubf::atom() = atom()
%%
%% ubf::record() = record()



%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% erlang-rfc46267
%%

%% json::object() = {obj, [json::pair()]}
%%
%% json::pair() = {string(), json::value()}
%%      string() = [byte()]
%%      byte() = integer()
%%
%% json::array() = [json::value()]
%%
%% json::value() = json::object() | json::array() | json::number() |  
json::string() | json::true() | json::false() | json::null()
%%
%% json::number() = integer() | float()
%%
%% json::string() = binary()
%%
%% json::true() = true
%% json::false() = false
%% json::null() = null



%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% json
%%

%% object
%%           {}
%%           { members }
%% members
%%           pair
%%           pair, members
%% pair
%%           string : value
%% array
%%          []
%%          [ elements ]
%% elements
%%          value
%%          value, elements
%% value
%%          string
%%          number
%%          object
%%          true (atom)
%%          false (atom)
%%          null (atom)


On Sun, 15 Feb 2009 20:39:10 +0900, Joe Armstrong <> wrote:

> For a long time I have been interested in describing protocols. In
> 2002 I published a contract system called UBF for defining protocols.
> This scheme was never widely adopted - perhaps it was just to
> strange...
>
> I have revised UBF and recast it in a form which I call JSON Protocols
> - since JSON is widely implemented, this method of described protocols
> might be more acceptable...
>
> Read the remainder of this on
>
> http://armstrongonsoftware.blogspot.com/2009/02/json-protocols-part-1.html
>
> /Joe Armstrong
> _______________________________________________
> erlang-questions mailing list
> 
> http://www.erlang.org/mailman/listinfo/erlang-questions



-- 




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