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|
(* -*- compile-command: "make -C ../.. plugins/subtac/subtac_plugin.cma" -*- *)
(************************************************************************)
(* v * The Coq Proof Assistant / The Coq Development Team *)
(* <O___,, * INRIA - CNRS - LIX - LRI - PPS - Copyright 1999-2010 *)
(* \VV/ **************************************************************)
(* // * This file is distributed under the terms of the *)
(* * GNU Lesser General Public License Version 2.1 *)
(************************************************************************)
(*i $Id: subtac_classes.ml 13328 2010-07-26 11:05:30Z herbelin $ i*)
open Pretyping
open Evd
open Environ
open Term
open Rawterm
open Topconstr
open Names
open Libnames
open Pp
open Vernacexpr
open Constrintern
open Subtac_command
open Typeclasses
open Typeclasses_errors
open Termops
open Decl_kinds
open Entries
open Util
module SPretyping = Subtac_pretyping.Pretyping
let interp_constr_evars_gen evdref env ?(impls=[]) kind c =
SPretyping.understand_tcc_evars evdref env kind
(intern_gen (kind=IsType) ~impls ( !evdref) env c)
let interp_casted_constr_evars evdref env ?(impls=[]) c typ =
interp_constr_evars_gen evdref env ~impls (OfType (Some typ)) c
let interp_context_evars evdref env params =
Constrintern.interp_context_gen
(fun env t -> SPretyping.understand_tcc_evars evdref env IsType t)
(SPretyping.understand_judgment_tcc evdref) !evdref env params
let type_ctx_instance evars env ctx inst subst =
let rec aux (subst, instctx) l = function
(na, b, t) :: ctx ->
let t' = substl subst t in
let c', l =
match b with
| None -> interp_casted_constr_evars evars env (List.hd l) t', List.tl l
| Some b -> substl subst b, l
in
evars := resolve_typeclasses ~onlyargs:true ~fail:true env !evars;
let d = na, Some c', t' in
aux (c' :: subst, d :: instctx) l ctx
| [] -> subst
in aux (subst, []) inst (List.rev ctx)
let new_instance ?(global=false) ctx (instid, bk, cl) props ?(generalize=true) pri =
let env = Global.env() in
let evars = ref Evd.empty in
let tclass, _ =
match bk with
| Implicit ->
Implicit_quantifiers.implicit_application Idset.empty (* need no avoid *)
~allow_partial:false (fun avoid (clname, (id, _, t)) ->
match clname with
| Some (cl, b) ->
let t =
if b then
let _k = class_info cl in
CHole (Util.dummy_loc, Some Evd.InternalHole)
else CHole (Util.dummy_loc, None)
in t, avoid
| None -> failwith ("new instance: under-applied typeclass"))
cl
| Explicit -> cl, Idset.empty
in
let tclass = if generalize then CGeneralization (dummy_loc, Implicit, Some AbsPi, tclass) else tclass in
let k, cty, ctx', ctx, len, imps, subst =
let (env', ctx), imps = interp_context_evars evars env ctx in
let c', imps' = interp_type_evars_impls ~evdref:evars env' tclass in
let len = List.length ctx in
let imps = imps @ Impargs.lift_implicits len imps' in
let ctx', c = decompose_prod_assum c' in
let ctx'' = ctx' @ ctx in
let cl, args = Typeclasses.dest_class_app (push_rel_context ctx'' env) c in
let _, args =
List.fold_right (fun (na, b, t) (args, args') ->
match b with
| None -> (List.tl args, List.hd args :: args')
| Some b -> (args, substl args' b :: args'))
(snd cl.cl_context) (args, [])
in
cl, c', ctx', ctx, len, imps, args
in
let id =
match snd instid with
| Name id ->
let sp = Lib.make_path id in
if Nametab.exists_cci sp then
errorlabstrm "new_instance" (Nameops.pr_id id ++ Pp.str " already exists");
id
| Anonymous ->
let i = Nameops.add_suffix (Classes.id_of_class k) "_instance_0" in
Namegen.next_global_ident_away i (Termops.ids_of_context env)
in
let env' = push_rel_context ctx env in
evars := Evarutil.nf_evar_map !evars;
evars := resolve_typeclasses ~onlyargs:false ~fail:true env !evars;
let sigma = !evars in
let subst = List.map (Evarutil.nf_evar sigma) subst in
let props =
match props with
| CRecord (loc, _, fs) ->
if List.length fs > List.length k.cl_props then
Classes.mismatched_props env' (List.map snd fs) k.cl_props;
Inl fs
| _ -> Inr props
in
let subst =
match props with
| Inr term ->
let c = interp_casted_constr_evars evars env' term cty in
Inr (c, subst)
| Inl props ->
let get_id =
function
| Ident id' -> id'
| _ -> errorlabstrm "new_instance" (Pp.str "Only local structures are handled")
in
let props, rest =
List.fold_left
(fun (props, rest) (id,b,_) ->
if b = None then
try
let (loc_mid, c) = List.find (fun (id', _) -> Name (snd (get_id id')) = id) rest in
let rest' = List.filter (fun (id', _) -> Name (snd (get_id id')) <> id) rest in
let (loc, mid) = get_id loc_mid in
Option.iter (fun x -> Dumpglob.add_glob loc (ConstRef x)) (List.assoc mid k.cl_projs);
c :: props, rest'
with Not_found ->
(CHole (Util.dummy_loc, None) :: props), rest
else props, rest)
([], props) k.cl_props
in
if rest <> [] then
unbound_method env' k.cl_impl (get_id (fst (List.hd rest)))
else
Inl (type_ctx_instance evars (push_rel_context ctx' env') k.cl_props props subst)
in
evars := Evarutil.nf_evar_map !evars;
let term, termtype =
match subst with
| Inl subst ->
let subst = List.fold_left2
(fun subst' s (_, b, _) -> if b = None then s :: subst' else subst')
[] subst (k.cl_props @ snd k.cl_context)
in
let app, ty_constr = instance_constructor k subst in
let termtype = it_mkProd_or_LetIn ty_constr (ctx' @ ctx) in
let term = Termops.it_mkLambda_or_LetIn app (ctx' @ ctx) in
term, termtype
| Inr (def, subst) ->
let termtype = it_mkProd_or_LetIn cty ctx in
let term = Termops.it_mkLambda_or_LetIn def ctx in
term, termtype
in
let termtype = Evarutil.nf_evar !evars termtype in
let term = Evarutil.nf_evar !evars term in
evars := undefined_evars !evars;
Evarutil.check_evars env Evd.empty !evars termtype;
let hook vis gr =
let cst = match gr with ConstRef kn -> kn | _ -> assert false in
let inst = Typeclasses.new_instance k pri global (ConstRef cst) in
Impargs.declare_manual_implicits false gr ~enriching:false imps;
Typeclasses.add_instance inst
in
let evm = Subtac_utils.evars_of_term !evars Evd.empty term in
let obls, _, constr, typ = Eterm.eterm_obligations env id !evars evm 0 term termtype in
id, Subtac_obligations.add_definition id ~term:constr typ ~kind:(Global,false,Instance) ~hook obls
|
