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(************************************************************************)
(* * The Coq Proof Assistant / The Coq Development Team *)
(* v * INRIA, CNRS and contributors - Copyright 1999-2018 *)
(* <O___,, * (see CREDITS file for the list of authors) *)
(* \VV/ **************************************************************)
(* // * This file is distributed under the terms of the *)
(* * GNU Lesser General Public License Version 2.1 *)
(* * (see LICENSE file for the text of the license) *)
(************************************************************************)
open Util
open Names
open Constr
open Context
open CErrors
open Evar_refiner
open Tacmach
open Tacexpr
open Refiner
open Evd
open Locus
open Context.Named.Declaration
open Ltac_pretype
module NamedDecl = Context.Named.Declaration
(* 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 = {
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 evar_list sigma c =
let rec evrec acc c =
match EConstr.kind sigma c with
| Evar (evk, _ as ev) -> ev :: acc
| _ -> EConstr.fold sigma evrec acc c in
evrec [] c
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 sigma (pf_concl gl)
| HypLocation (id,hloc) ->
let decl = Environ.lookup_named id (pf_env gl) in
match hloc with
InHyp ->
(match decl with
| LocalAssum (_,typ) -> evar_list sigma (EConstr.of_constr typ)
| _ -> user_err Pp.(str "Please be more specific: in type or value?"))
| InHypTypeOnly ->
evar_list sigma (EConstr.of_constr (NamedDecl.get_type decl))
| InHypValueOnly ->
(match decl with
| LocalDef (_,body,_) -> evar_list sigma (EConstr.of_constr body)
| _ -> user_err Pp.(str "Not a defined hypothesis.")) in
if List.length evl < n then
user_err Pp.(str "Not enough uninstantiated existential variables.");
if n <= 0 then user_err Pp.(str "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 -> user_err Pp.(str "Unknown existential variable.") in
instantiate_evar evk c sigma gl
end
let let_evar name typ =
let src = (Loc.tag Evar_kinds.GoalEvar) in
Proofview.Goal.enter begin fun gl ->
let sigma = Tacmach.New.project gl in
let env = Proofview.Goal.env gl in
let sigma, _ = Typing.sort_of env sigma typ in
let id = match name with
| Name.Anonymous ->
let id = Namegen.id_of_name_using_hdchar env sigma typ name in
Namegen.next_ident_away_in_goal id (Termops.vars_of_env env)
| Name.Name id -> id
in
let (sigma, evar) = Evarutil.new_evar env sigma ~src ~naming:(Namegen.IntroFresh id) typ in
Tacticals.New.tclTHEN (Proofview.Unsafe.tclEVARS sigma)
(Tactics.pose_tac (Name.Name id) evar)
end
let hget_evar n =
let open EConstr in
Proofview.Goal.enter begin fun gl ->
let sigma = Tacmach.New.project gl in
let concl = Proofview.Goal.concl gl in
let evl = evar_list sigma concl in
if List.length evl < n then
user_err Pp.(str "Not enough uninstantiated existential variables.");
if n <= 0 then user_err Pp.(str "Incorrect existential variable index.");
let ev = List.nth evl (n-1) in
let ev_type = EConstr.existential_type sigma ev in
let r = Retyping.relevance_of_type (Proofview.Goal.env gl) sigma ev_type in
Tactics.change_concl (mkLetIn (make_annot Name.Anonymous r,mkEvar ev,ev_type,concl))
end
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