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|
(************************************************************************)
(* v * The Coq Proof Assistant / The Coq Development Team *)
(* <O___,, * INRIA - CNRS - LIX - LRI - PPS - Copyright 1999-2016 *)
(* \VV/ **************************************************************)
(* // * This file is distributed under the terms of the *)
(* * GNU Lesser General Public License Version 2.1 *)
(************************************************************************)
open Util
open Sigma.Notations
open Proofview.Notations
open Context.Named.Declaration
let extract_prefix env info =
let ctx1 = List.rev (Environ.named_context env) in
let ctx2 = List.rev (Evd.evar_context info) in
let rec share l1 l2 accu = match l1, l2 with
| d1 :: l1, d2 :: l2 ->
if d1 == d2 then share l1 l2 (d1 :: accu)
else (accu, d2 :: l2)
| _ -> (accu, l2)
in
share ctx1 ctx2 []
let typecheck_evar ev env sigma =
let info = Evd.find sigma ev in
(** Typecheck the hypotheses. *)
let type_hyp (sigma, env) decl =
let t = get_type decl in
let evdref = ref sigma in
let _ = Typing.e_sort_of env evdref t in
let () = match decl with
| LocalAssum _ -> ()
| LocalDef (_,body,_) -> Typing.e_check env evdref body t
in
(!evdref, Environ.push_named decl env)
in
let (common, changed) = extract_prefix env info in
let env = Environ.reset_with_named_context (Environ.val_of_named_context common) env in
let (sigma, env) = List.fold_left type_hyp (sigma, env) changed in
(** Typecheck the conclusion *)
let evdref = ref sigma in
let _ = Typing.e_sort_of env evdref (Evd.evar_concl info) in
!evdref
let typecheck_proof c concl env sigma =
let evdref = ref sigma in
let () = Typing.e_check env evdref c concl in
!evdref
let (pr_constrv,pr_constr) =
Hook.make ~default:(fun _env _sigma _c -> Pp.str"<constr>") ()
let refine ?(unsafe = true) f = Proofview.Goal.enter { enter = begin fun gl ->
let gl = Proofview.Goal.assume gl in
let sigma = Proofview.Goal.sigma gl in
let sigma = Sigma.to_evar_map sigma in
let env = Proofview.Goal.env gl in
let concl = Proofview.Goal.concl gl in
(** Save the [future_goals] state to restore them after the
refinement. *)
let prev_future_goals = Evd.future_goals sigma in
let prev_principal_goal = Evd.principal_future_goal sigma in
(** Create the refinement term *)
let (c, sigma) = Sigma.run (Evd.reset_future_goals sigma) f in
let evs = Evd.future_goals sigma in
let evkmain = Evd.principal_future_goal sigma in
(** Check that the introduced evars are well-typed *)
let fold accu ev = typecheck_evar ev env accu in
let sigma = if unsafe then sigma else CList.fold_left fold sigma evs in
(** Check that the refined term is typesafe *)
let sigma = if unsafe then sigma else typecheck_proof c concl env sigma in
(** Check that the goal itself does not appear in the refined term *)
let self = Proofview.Goal.goal gl in
let _ =
if not (Evarutil.occur_evar_upto sigma self c) then ()
else Pretype_errors.error_occur_check env sigma self c
in
(** Proceed to the refinement *)
let sigma = match evkmain with
| None -> Evd.define self c sigma
| Some evk ->
let id = Evd.evar_ident self sigma in
let sigma = Evd.define self c sigma in
match id with
| None -> sigma
| Some id -> Evd.rename evk id sigma
in
(** Restore the [future goals] state. *)
let sigma = Evd.restore_future_goals sigma prev_future_goals prev_principal_goal in
(** Select the goals *)
let comb = CList.map_filter (Proofview.Unsafe.advance sigma) (CList.rev evs) in
let sigma = CList.fold_left Proofview.Unsafe.mark_as_goal sigma comb in
let trace () = Pp.(hov 2 (str"refine"++spc()++ Hook.get pr_constrv env sigma c)) in
Proofview.Trace.name_tactic trace (Proofview.tclUNIT ()) >>= fun () ->
Proofview.Unsafe.tclEVARS sigma >>= fun () ->
Proofview.Unsafe.tclSETGOALS comb
end }
(** Useful definitions *)
let with_type env evd c t =
let my_type = Retyping.get_type_of env evd c in
let j = Environ.make_judge c my_type in
let (evd,j') =
Coercion.inh_conv_coerce_to true (Loc.ghost) env evd j t
in
evd , j'.Environ.uj_val
let refine_casted ?unsafe f = Proofview.Goal.enter { enter = begin fun gl ->
let gl = Proofview.Goal.assume gl in
let concl = Proofview.Goal.concl gl in
let env = Proofview.Goal.env gl in
let f = { run = fun h ->
let Sigma (c, h, p) = f.run h in
let sigma, c = with_type env (Sigma.to_evar_map h) c concl in
Sigma (c, Sigma.Unsafe.of_evar_map sigma, p)
} in
refine ?unsafe f
end }
|
