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(*
Copyright © 2011 MLstate

This file is part of OPA.

OPA is free software: you can redistribute it and/or modify it under the
terms of the GNU Affero General Public License, version 3, as published by
the Free Software Foundation.

OPA 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 Affero General Public License for
more details.

You should have received a copy of the GNU Affero General Public License
along with OPA. If not, see <http://www.gnu.org/licenses/>.
*)
(* The lexer definition *)
open RequestParse
open Printf

type lexical_error = Illegal_character

exception Lexical_error of lexical_error * int * int

let parse = lexer
  | [' ' '\t']+ -> SPACE (Ulexing.utf8_lexeme lexbuf)
  | '\r' '\n' -> EOL
  | '\r' -> EOL
  | '\n' -> EOL
  | ([^':' ' ' '\t' '\n' '\r'])+ -> WORD (Ulexing.utf8_lexeme lexbuf)
  | ":" -> COLON
  | eof -> EOF

let parse_request str =
  (* The following line cost 1/4 of the time: *)
  let buffer = Ulexing.from_utf8_string str in
  let res() =
      (* Trick from Alain Frisch to use Ulex with OCamlyacc *)
      (* http://caml.inria.fr/pub/ml-archives/caml-list/2005/01/52cbc2cd2be4fc7ea0f00c39a760bf59.en.html *)
      request (fun _ -> parse buffer) (Lexing.from_string "dummy")
  in
  try ((Ulexing.lexeme_end buffer, res()):int * RequestType.parse_request)
  with _ -> Ulexing.lexeme_end buffer, RequestType.Incomplete
Something went wrong with that request. Please try again.