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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 Refiner
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 (ist,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 defined hypothesis.") in
if List.length evl < n then
error "Not enough uninstantiated existential variables.";
if n <= 0 then error "Incorrect existential variable index.";
let evk,_ = destEvar (List.nth evl (n-1)) in
let evi = Evd.find sigma evk in
let ltac_vars = Tacinterp.extract_ltac_vars ist sigma (Evd.evar_env evi) in
let sigma' = w_refine (evk,evi) (ltac_vars,rawc) sigma in
tclTHEN
(tclEVARS sigma')
tclNORMEVAR
gl
let let_evar name typ gls =
let sigma',evar = Evarutil.new_evar gls.sigma (pf_env gls) typ in
Refiner.tclTHEN (Refiner.tclEVARS sigma')
(Tactics.letin_tac None name evar None nowhere) gls
|
