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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 Term
open Util
open Evar_refiner
open Tacmach
open Tacexpr
open Proof_type
open Evd
open Sign
open Termops
(* The instantiate tactic *)
let evar_list evc c =
let rec evrec acc c =
match kind_of_term c with
| Evar (n, _) when Evd.mem evc n -> c :: acc
| _ -> fold_constr evrec acc c
in
evrec [] c
let instantiate n rawc ido gl =
let sigma = gl.sigma in
let evl =
match ido with
ConclLocation () -> evar_list sigma gl.it.evar_concl
| HypLocation (id,hloc) ->
let decl = Environ.lookup_named_val id gl.it.evar_hyps in
match hloc with
InHyp ->
(match decl with
(_,None,typ) -> evar_list sigma typ
| _ -> error
"please be more specific : in type or value ?")
| InHypTypeOnly ->
let (_, _, typ) = decl in evar_list sigma typ
| InHypValueOnly ->
(match decl with
(_,Some body,_) -> evar_list sigma body
| _ -> error "not a let .. in hypothesis") in
if List.length evl < n then
error "not enough uninstantiated existential variables";
if n <= 0 then error "incorrect existential variable index";
let ev,_ = destEvar (List.nth evl (n-1)) in
let evd' = w_refine ev rawc (create_goal_evar_defs sigma) in
Refiner.tclEVARS (evars_of evd') gl
(*
let pfic gls c =
let evc = gls.sigma in
Constrintern.interp_constr evc (Global.env_of_context gls.it.evar_hyps) c
let instantiate_tac = function
| [Integer n; Command com] ->
(fun gl -> instantiate n (pfic gl com) gl)
| [Integer n; Constr c] ->
(fun gl -> instantiate n c gl)
| _ -> invalid_arg "Instantiate called with bad arguments"
*)
let let_evar name typ gls =
let evd = Evd.create_goal_evar_defs gls.sigma in
let evd',evar = Evarutil.new_evar evd (pf_env gls) typ in
Refiner.tclTHEN (Refiner.tclEVARS (evars_of evd'))
(Tactics.letin_tac true name evar nowhere) gls
|
