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(************************************************************************)
(* * The Coq Proof Assistant / The Coq Development Team *)
(* v * INRIA, CNRS and contributors - Copyright 1999-2018 *)
(* <O___,, * (see CREDITS file for the list of authors) *)
(* \VV/ **************************************************************)
(* // * This file is distributed under the terms of the *)
(* * GNU Lesser General Public License Version 2.1 *)
(* * (see LICENSE file for the text of the license) *)
(************************************************************************)
(* Poor's man DECLARE PLUGIN *)
let __coq_plugin_name = "ascii_syntax_plugin"
let () = Mltop.add_known_module __coq_plugin_name
open Pp
open CErrors
open Util
open Names
open Glob_term
open Globnames
open Coqlib
exception Non_closed_ascii
let make_dir l = DirPath.make (List.rev_map Id.of_string l)
let make_kn dir id = Globnames.encode_mind (make_dir dir) (Id.of_string id)
let make_path dir id = Libnames.make_path (make_dir dir) (Id.of_string id)
let is_gr c gr = match DAst.get c with
| GRef (r, _) -> Globnames.eq_gr r gr
| _ -> false
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 ?loc p =
let rec aux n p =
if Int.equal n 0 then [] else
let mp = p mod 2 in
(DAst.make ?loc @@ GRef ((if Int.equal mp 0 then glob_false else glob_true),None))
:: (aux (n-1) (p/2)) in
DAst.make ?loc @@ GApp (DAst.make ?loc @@ GRef(force glob_Ascii,None), aux 8 p)
let interp_ascii_string ?loc s =
let p =
if Int.equal (String.length s) 1 then int_of_char s.[0]
else
if Int.equal (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 ~hdr:"interp_ascii_string"
(str "Expects a single character or a three-digits ascii code.") in
interp_ascii ?loc p
let uninterp_ascii r =
let rec uninterp_bool_list n = function
| [] when Int.equal n 0 -> 0
| r::l when is_gr r glob_true -> 1+2*(uninterp_bool_list (n-1) l)
| r::l when is_gr r glob_false -> 2*(uninterp_bool_list (n-1) l)
| _ -> raise Non_closed_ascii in
try
let aux c = match DAst.get c with
| GApp (r, l) when is_gr r (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 (AnyGlobConstr r) = Option.map make_ascii_string (uninterp_ascii r)
let _ =
Notation.declare_string_interpreter "char_scope"
(ascii_path,ascii_module)
interp_ascii_string
([DAst.make @@ GRef (static_glob_Ascii,None)], uninterp_ascii_string, true)
|
