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|
(************************************************************************)
(* v * The Coq Proof Assistant / The Coq Development Team *)
(* <O___,, * CNRS-Ecole Polytechnique-INRIA Futurs-Universite Paris Sud *)
(* \VV/ **************************************************************)
(* // * This file is distributed under the terms of the *)
(* * GNU Lesser General Public License Version 2.1 *)
(************************************************************************)
(* $Id$ *)
open Pp
open Util
open Names
open Libnames
open Himsg
open Proof_type
open Tacinterp
open Vernacexpr
let disable_drop e =
if e <> Drop then e
else UserError("Vernac.disable_drop",(str"Drop is forbidden."))
(* Table of vernac entries *)
let vernac_tab =
(Hashtbl.create 51 :
(string, Tacexpr.raw_generic_argument list -> unit -> unit) Hashtbl.t)
let vinterp_add s f =
try
Hashtbl.add vernac_tab s f
with Failure _ ->
errorlabstrm "vinterp_add"
(str"Cannot add the vernac command " ++ str s ++ str" twice.")
let overwriting_vinterp_add s f =
begin
try
let _ = Hashtbl.find vernac_tab s in Hashtbl.remove vernac_tab s
with Not_found -> ()
end;
Hashtbl.add vernac_tab s f
let vinterp_map s =
try
Hashtbl.find vernac_tab s
with Not_found ->
errorlabstrm "Vernac Interpreter"
(str"Cannot find vernac command " ++ str s ++ str".")
let vinterp_init () = Hashtbl.clear vernac_tab
(* Interpretation of a vernac command *)
let call (opn,converted_args) =
let loc = ref "Looking up command" in
try
let callback = vinterp_map opn in
loc:= "Checking arguments";
let hunk = callback converted_args in
loc:= "Executing command";
hunk()
with
| Drop -> raise Drop
| ProtectedLoop -> raise ProtectedLoop
| e ->
if !Flags.debug then
msgnl (str"Vernac Interpreter " ++ str !loc);
raise e
let bad_vernac_args s =
anomalylabstrm s
(str"Vernac " ++ str s ++ str" called with bad arguments")
|
