Source file sedlex.ml

(*********************************************************************************)
(*                OCaml-RDF                                                      *)
(*                                                                               *)
(*    Copyright (C) 2012-2021 Institut National de Recherche en Informatique     *)
(*    et en Automatique. All rights reserved.                                    *)
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(*    02111-1307  USA                                                            *)
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(*    Contact: Maxence.Guesdon@inria.fr                                          *)
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(*********************************************************************************)

(** *)

(** This code is adapted from CCSS: file ccss.ml *)

exception Parse_error of exn * Lexing.position

let nl_char = Uchar.of_char '\n'

let update_pos pos str =
  let open Lexing in
  let f pos i = function
  | `Malformed msg -> 
      let exn = Failure msg in
      raise (Parse_error (exn, pos))
  | `Uchar c when Uchar.equal c nl_char ->
      let bol = pos.pos_cnum in
      { pos with
        pos_lnum = pos.pos_lnum + 1;
        pos_bol = bol ;
        pos_cnum = pos.pos_cnum + 1 ;
      }
  | _ -> { pos with pos_cnum = pos.pos_cnum + 1}
  in
  Uutf.String.fold_utf_8 f pos str

let upd pos lexbuf = update_pos pos (Sedlexing.Utf8.lexeme lexbuf)


let menhir_with_ulex menhir_parser lexer ?(fname="") lexbuf =
	let position = ref
		{
      Lexing.pos_fname = fname ;
      pos_lnum = 1;
      pos_bol = 0;
      pos_cnum = 0;
    }
  in
  let lexer_maker () =
    let ante_position = !position in
    let (pos, token) = lexer !position lexbuf in
    position := pos ;
    (token, ante_position, !position)
  in
  let revised_parser = MenhirLib.Convert.Simplified.traditional2revised menhir_parser in
  try revised_parser lexer_maker
  with
    Parse_error _ as e -> raise e
  | e -> raise (Parse_error (e, !position))
;;