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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 *)
(***********************************************************************)
(* $Id$ *)
open Util
open Names
open Term
open Sign
(* The type of mappings for existential variables *)
type evar = int
type evar_body =
| Evar_empty
| Evar_defined of constr
type evar_info = {
evar_concl : constr;
evar_hyps : named_context;
evar_body : evar_body}
type evar_map = evar_info Intmap.t
let empty = Intmap.empty
let to_list evc = Intmap.fold (fun ev x acc -> (ev,x)::acc) evc []
let dom evc = Intmap.fold (fun ev _ acc -> ev::acc) evc []
let map evc k = Intmap.find k evc
let rmv evc k = Intmap.remove k evc
let remap evc k i = Intmap.add k i evc
let in_dom evc k = Intmap.mem k evc
let add evd ev newinfo = Intmap.add ev newinfo evd
let define evd ev body =
let oldinfo = map evd ev in
let newinfo =
{ evar_concl = oldinfo.evar_concl;
evar_hyps = oldinfo.evar_hyps;
evar_body = Evar_defined body}
in
match oldinfo.evar_body with
| Evar_empty -> Intmap.add ev newinfo evd
| _ -> anomaly "cannot define an isevar twice"
(* The list of non-instantiated existential declarations *)
let non_instantiated sigma =
let listev = to_list sigma in
List.fold_left
(fun l ((ev,evd) as d) ->
if evd.evar_body = Evar_empty then (d::l) else l)
[] listev
let is_evar sigma ev = in_dom sigma ev
let is_defined sigma ev =
let info = map sigma ev in
not (info.evar_body = Evar_empty)
let evar_body ev = ev.evar_body
let id_of_existential ev =
id_of_string ("?" ^ string_of_int ev)
|
