seppo/lib/plain2handle.mll

(*
 *    _  _   ____                         _  
 *  _| || |_/ ___|  ___ _ __  _ __   ___ | | 
 * |_  ..  _\___ \ / _ \ '_ \| '_ \ / _ \| | 
 * |_      _|___) |  __/ |_) | |_) | (_) |_| 
 *   |_||_| |____/ \___| .__/| .__/ \___/(_) 
 *                     |_|   |_|             
 *
 * Personal Social Web.
 *
 * Copyright (C) The #Seppo contributors. All rights reserved.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *)

(* https://ohama.github.io/ocaml/ocamllex-tutorial/simpleexample/ *)
{ }


let alpha      = [ 'a'-'z' 'A'-'Z' ]                 (* https://datatracker.ietf.org/doc/html/rfc2234#section-6.1 *)
let digit      = [ '0'-'9' ]                         (* https://datatracker.ietf.org/doc/html/rfc2234#section-6.1 *)
let unreserved = alpha | digit | [ '-' '.' '_' '~' ] (* https://datatracker.ietf.org/doc/html/rfc3986#section-2.3 *)

rule handle lst = parse
| '@' (unreserved+ '@' unreserved* alpha as h) { handle (h :: lst) lexbuf }
| _                                            { handle lst lexbuf }
| eof                                          { lst }