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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 = "int31_syntax_plugin"
let () = Mltop.add_known_module __coq_plugin_name
(* digit-based syntax for int31 *)
open Bigint
open Names
open Globnames
open Glob_term
(*** Constants for locating int31 constructors ***)
let make_dir l = DirPath.make (List.rev_map Id.of_string l)
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 make_mind mp id = Names.MutInd.make2 mp (Label.make id)
let make_mind_mpfile dir id = make_mind (ModPath.MPfile (make_dir dir)) id
let make_mind_mpdot dir modname id =
let mp = ModPath.MPdot (ModPath.MPfile (make_dir dir), Label.make modname)
in make_mind mp id
(* int31 stuff *)
let int31_module = ["Coq"; "Numbers"; "Cyclic"; "Int31"; "Int31"]
let int31_path = make_path int31_module "int31"
let int31_id = make_mind_mpfile int31_module
let int31_scope = "int31_scope"
let int31_construct = ConstructRef ((int31_id "int31",0),1)
let int31_0 = ConstructRef ((int31_id "digits",0),1)
let int31_1 = ConstructRef ((int31_id "digits",0),2)
(*** Definition of the Non_closed exception, used in the pretty printing ***)
exception Non_closed
(*** Parsing for int31 in digital notation ***)
(* parses a *non-negative* integer (from bigint.ml) into an int31
wraps modulo 2^31 *)
let int31_of_pos_bigint ?loc n =
let ref_construct = DAst.make ?loc (GRef (int31_construct, None)) in
let ref_0 = DAst.make ?loc (GRef (int31_0, None)) in
let ref_1 = DAst.make ?loc (GRef (int31_1, None)) in
let rec args counter n =
if counter <= 0 then
[]
else
let (q,r) = div2_with_rest n in
(if r then ref_1 else ref_0)::(args (counter-1) q)
in
DAst.make ?loc (GApp (ref_construct, List.rev (args 31 n)))
let error_negative ?loc =
CErrors.user_err ?loc ~hdr:"interp_int31" (Pp.str "int31 are only non-negative numbers.")
let interp_int31 ?loc n =
if is_pos_or_zero n then
int31_of_pos_bigint ?loc n
else
error_negative ?loc
(* Pretty prints an int31 *)
let bigint_of_int31 =
let rec args_parsing args cur =
match args with
| [] -> cur
| r::l when is_gr r int31_0 -> args_parsing l (mult_2 cur)
| r::l when is_gr r int31_1 -> args_parsing l (add_1 (mult_2 cur))
| _ -> raise Non_closed
in
fun c -> match DAst.get c with
| GApp (r, args) when is_gr r int31_construct -> args_parsing args zero
| _ -> raise Non_closed
let uninterp_int31 (AnyGlobConstr i) =
try
Some (bigint_of_int31 i)
with Non_closed ->
None
(* Actually declares the interpreter for int31 *)
let _ = Notation.declare_numeral_interpreter int31_scope
(int31_path, int31_module)
interp_int31
([DAst.make (GRef (int31_construct, None))],
uninterp_int31,
true)
|
