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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 Util
open Errors
open Evar_refiner
open Tacmach
open Tacexpr
open Refiner
open Evd
open Locus
(* The instantiate tactic *)
let instantiate_evar evk (ist,rawc) sigma =
let evi = Evd.find sigma evk in
let filtered = Evd.evar_filtered_env evi in
let constrvars = Tacinterp.extract_ltac_constr_values ist filtered in
let lvar = {
Pretyping.ltac_constrs = constrvars;
ltac_uconstrs = Names.Id.Map.empty;
ltac_idents = Names.Id.Map.empty;
ltac_genargs = ist.Geninterp.lfun;
} in
let sigma' = w_refine (evk,evi) (lvar ,rawc) sigma in
tclEVARS sigma'
let instantiate_tac n c ido =
Proofview.V82.tactic begin fun gl ->
let sigma = gl.sigma in
let evl =
match ido with
ConclLocation () -> evar_list (pf_concl gl)
| HypLocation (id,hloc) ->
let decl = Environ.lookup_named_val id (Goal.V82.hyps sigma (sig_it gl)) in
match hloc with
InHyp ->
(match decl with
(_,None,typ) -> evar_list typ
| _ -> error
"Please be more specific: in type or value?")
| InHypTypeOnly ->
let (_, _, typ) = decl in evar_list typ
| InHypValueOnly ->
(match decl with
(_,Some body,_) -> evar_list 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,_ = List.nth evl (n-1) in
instantiate_evar evk c sigma gl
end
let instantiate_tac_by_name id c =
Proofview.V82.tactic begin fun gl ->
let sigma = gl.sigma in
let evk =
try Evd.evar_key id sigma
with Not_found -> error "Unknown existential variable." in
instantiate_evar evk c sigma gl
end
let let_evar name typ =
let src = (Loc.ghost,Evar_kinds.GoalEvar) in
Proofview.Goal.enter begin fun gl ->
let sigma = Proofview.Goal.sigma gl in
let env = Proofview.Goal.env gl in
let id = match name with
| Names.Anonymous ->
let id = Namegen.id_of_name_using_hdchar env typ name in
Namegen.next_ident_away_in_goal id (Termops.ids_of_named_context (Environ.named_context env))
| Names.Name id -> id in
let sigma',evar = Evarutil.new_evar env sigma ~src ~naming:(Misctypes.IntroFresh id) typ in
Tacticals.New.tclTHEN (Proofview.V82.tactic (Refiner.tclEVARS sigma'))
(Tactics.letin_tac None (Names.Name id) evar None Locusops.nowhere)
end
|
