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|
(************************************************************************)
(* v * The Coq Proof Assistant / The Coq Development Team *)
(* <O___,, * INRIA - CNRS - LIX - LRI - PPS - Copyright 1999-2015 *)
(* \VV/ **************************************************************)
(* // * This file is distributed under the terms of the *)
(* * GNU Lesser General Public License Version 2.1 *)
(************************************************************************)
open Errors
open Util
type 'a t = string * string
type repr =
| Static of string * string
| Dynamic of string
type universe = string
(* The univ_tab is not part of the state. It contains all the grammars that
exist or have existed before in the session. *)
let univ_tab = (Hashtbl.create 7 : (string, unit) Hashtbl.t)
let create_univ s =
Hashtbl.add univ_tab s (); s
let univ_name s = s
let uprim = create_univ "prim"
let uconstr = create_univ "constr"
let utactic = create_univ "tactic"
let uvernac = create_univ "vernac"
let get_univ s =
try
Hashtbl.find univ_tab s; s
with Not_found ->
anomaly (Pp.str ("Unknown grammar universe: "^s))
(** Entries are registered with a unique name *)
let entries = ref String.Set.empty
let create u name =
let uname = u ^ ":" ^ name in
let () =
if String.Set.mem uname !entries then
anomaly (Pp.str ("Entry " ^ uname ^ " already defined"))
in
let () = entries := String.Set.add uname !entries in
(u, name)
let dynamic name = ("", name)
let unsafe_of_name (u, s) =
let uname = u ^ ":" ^ s in
assert (String.Set.mem uname !entries);
(u, s)
let repr = function
| ("", u) -> Dynamic u
| (u, s) -> Static (u, s)
|
