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type t = {
localpart : string option;
domainpart : string;
resourcepart : string option;
}
exception InvalidUTF8
let of_string (jid : string) : t =
let open Uchar in
let len = String.length jid in
let rec to_localpart i =
if i <= 0 then
None
else
let c = String.get_utf_8_uchar jid i in
if not (utf_decode_is_valid c)
then raise InvalidUTF8
else
let k = utf_decode_length c in
match utf_decode_uchar c |> to_char with
| '@' -> Some (i + 1)
| _ -> to_localpart (i - k)
and to_resourcepart i =
if i >= len then
None
else
let c = String.get_utf_8_uchar jid i in
if not (utf_decode_is_valid c)
then raise InvalidUTF8
else
let k = utf_decode_length c in
match utf_decode_uchar c |> to_char with
| '/' -> Some i
| _ -> to_resourcepart (i + k)
in let r = to_resourcepart 0 in
let rv = Option.value ~default:len r in
let l = to_localpart (rv-1) in
let lv = Option.value ~default:0 l in
{
localpart = Option.map (fun i -> String.sub jid 0 (i-1)) l;
resourcepart = Option.map (fun i -> String.sub jid (i+1) (len-i-1)) r;
domainpart = String.sub jid lv (rv-lv);
}
|
