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|
(***********************************************************************)
(* v * The Coq Proof Assistant / The Coq Development Team *)
(* <O___,, * INRIA-Rocquencourt & LRI-CNRS-Orsay *)
(* \VV/ *************************************************************)
(* // * This file is distributed under the terms of the *)
(* * GNU Lesser General Public License Version 2.1 *)
(***********************************************************************)
(*i $Id: g_ascii_syntax.ml 11309 2008-08-06 10:30:35Z herbelin $ i*)
open Pp
open Util
open Names
open Pcoq
open Rawterm
open Topconstr
open Libnames
open Coqlib
open Bigint
exception Non_closed_ascii
let make_dir l = make_dirpath (List.map id_of_string (List.rev l))
let make_kn dir id = Libnames.encode_kn (make_dir dir) (id_of_string id)
let make_path dir id = Libnames.make_path (make_dir dir) (id_of_string id)
let ascii_module = ["Coq";"Strings";"Ascii"]
let ascii_path = make_path ascii_module "ascii"
let ascii_kn = make_kn ascii_module "ascii"
let path_of_Ascii = ((ascii_kn,0),1)
let static_glob_Ascii = ConstructRef path_of_Ascii
let make_reference id = find_reference "Ascii interpretation" ascii_module id
let glob_Ascii = lazy (make_reference "Ascii")
open Lazy
let interp_ascii dloc p =
let rec aux n p =
if n = 0 then [] else
let mp = p mod 2 in
RRef (dloc,if mp = 0 then glob_false else glob_true)
:: (aux (n-1) (p/2)) in
RApp (dloc,RRef(dloc,force glob_Ascii), aux 8 p)
let interp_ascii_string dloc s =
let p =
if String.length s = 1 then int_of_char s.[0]
else
if String.length s = 3 & is_digit s.[0] & is_digit s.[1] & is_digit s.[2]
then int_of_string s
else
user_err_loc (dloc,"interp_ascii_string",
str "Expects a single character or a three-digits ascii code.") in
interp_ascii dloc p
let uninterp_ascii r =
let rec uninterp_bool_list n = function
| [] when n = 0 -> 0
| RRef (_,k)::l when k = glob_true -> 1+2*(uninterp_bool_list (n-1) l)
| RRef (_,k)::l when k = glob_false -> 2*(uninterp_bool_list (n-1) l)
| _ -> raise Non_closed_ascii in
try
let rec aux = function
| RApp (_,RRef (_,k),l) when k = force glob_Ascii -> uninterp_bool_list 8 l
| _ -> raise Non_closed_ascii in
Some (aux r)
with
Non_closed_ascii -> None
let make_ascii_string n =
if n>=32 && n<=126 then String.make 1 (char_of_int n)
else Printf.sprintf "%03d" n
let uninterp_ascii_string r = Option.map make_ascii_string (uninterp_ascii r)
let _ =
Notation.declare_string_interpreter "char_scope"
(ascii_path,ascii_module)
interp_ascii_string
([RRef (dummy_loc,static_glob_Ascii)], uninterp_ascii_string, true)
|
