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|
(* -*- compile-command: "make -C .. bin/coqtop.byte" -*- *)
(************************************************************************)
(* 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 *)
(************************************************************************)
(*i $Id$ i*)
(*i*)
open Names
open Decl_kinds
open Term
open Termops
open Sign
open Entries
open Evd
open Environ
open Nametab
open Mod_subst
open Util
open Typeclasses_errors
open Typeclasses
open Libnames
open Constrintern
open Rawterm
open Topconstr
(*i*)
open Decl_kinds
open Entries
let typeclasses_db = "typeclass_instances"
let set_typeclass_transparency c b =
Auto.add_hints false [typeclasses_db]
(Auto.HintsTransparencyEntry ([c], b))
let _ =
Typeclasses.register_add_instance_hint
(fun inst pri ->
Flags.silently (fun () ->
Auto.add_hints false [typeclasses_db]
(Auto.HintsResolveEntry
[pri, false, constr_of_global inst])) ());
Typeclasses.register_set_typeclass_transparency set_typeclass_transparency
let declare_class glob idl =
match global (Ident idl) with
| ConstRef x -> Typeclasses.add_constant_class x
| IndRef x -> Typeclasses.add_inductive_class x
| _ -> user_err_loc (fst idl, "declare_class",
Pp.str"Unsupported class type, only constants and inductives are allowed")
let declare_instance_cst glob c =
let instance = Typing.type_of (Global.env ()) Evd.empty (constr_of_global c) in
let _, r = decompose_prod_assum instance in
match class_of_constr r with
| Some tc -> add_instance (new_instance tc None glob c)
| None -> errorlabstrm "" (Pp.strbrk "Constant does not build instances of a declared type class.")
let declare_instance glob idl =
let con =
try global (Ident idl)
with _ -> error "Instance definition not found."
in declare_instance_cst glob con
let mismatched_params env n m = mismatched_ctx_inst env Parameters n m
let mismatched_props env n m = mismatched_ctx_inst env Properties n m
type binder_list = (identifier located * bool * constr_expr) list
(* Calls to interpretation functions. *)
let interp_type_evars evdref env ?(impls=([],[])) typ =
let typ' = intern_gen true ~impls !evdref env typ in
let imps = Implicit_quantifiers.implicits_of_rawterm typ' in
imps, Pretyping.Default.understand_tcc_evars evdref env Pretyping.IsType typ'
(* Declare everything in the parameters as implicit, and the class instance as well *)
open Topconstr
let type_ctx_instance evars env ctx inst subst =
let (s, _) =
List.fold_left2
(fun (subst, instctx) (na, b, t) ce ->
let t' = substl subst t in
let c' =
match b with
| None -> interp_casted_constr_evars evars env ce t'
| Some b -> substl subst b
in
let d = na, Some c', t' in
c' :: subst, d :: instctx)
(subst, []) (List.rev ctx) inst
in s
let refine_ref = ref (fun _ -> assert(false))
let id_of_class cl =
match cl.cl_impl with
| ConstRef kn -> let _,_,l = repr_con kn in id_of_label l
| IndRef (kn,i) ->
let mip = (Environ.lookup_mind kn (Global.env ())).Declarations.mind_packets in
mip.(0).Declarations.mind_typename
| _ -> assert false
open Pp
let ($$) g f = fun x -> g (f x)
let instance_hook k pri global imps ?hook cst =
let inst = Typeclasses.new_instance k pri global cst in
Impargs.maybe_declare_manual_implicits false cst ~enriching:false imps;
Typeclasses.add_instance inst;
(match hook with Some h -> h cst | None -> ())
let declare_instance_constant k pri global imps ?hook id term termtype =
let cdecl =
let kind = IsDefinition Instance in
let entry =
{ const_entry_body = term;
const_entry_type = Some termtype;
const_entry_opaque = false;
const_entry_boxed = false }
in DefinitionEntry entry, kind
in
let kn = Declare.declare_constant id cdecl in
Flags.if_verbose Command.definition_message id;
instance_hook k pri global imps ?hook (ConstRef kn);
id
let new_instance ?(global=false) ctx (instid, bk, cl) props ?(generalize=true)
?(tac:Proof_type.tactic option) ?(hook:(global_reference -> unit) option) pri =
let env = Global.env() in
let evars = ref Evd.empty in
let tclass, ids =
match bk with
| Implicit ->
Implicit_quantifiers.implicit_application Idset.empty ~allow_partial:false
(fun avoid (clname, (id, _, t)) ->
match clname with
| Some (cl, b) ->
let t = 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, 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
cl, ctx', len, imps, List.rev 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 (id_of_class k) "_instance_0" in
Termops.next_global_ident_away false i (Termops.ids_of_context env)
in
let env' = push_rel_context ctx' env in
evars := Evarutil.nf_evar_defs !evars;
evars := resolve_typeclasses env !evars;
let sigma = !evars in
let subst = List.map (Evarutil.nf_evar sigma) subst in
if Lib.is_modtype () then
begin
let _, ty_constr = instance_constructor k (List.rev subst) in
let termtype =
let t = it_mkProd_or_LetIn ty_constr ctx' in
Evarutil.nf_isevar !evars t
in
Evarutil.check_evars env Evd.empty !evars termtype;
let cst = Declare.declare_internal_constant id
(Entries.ParameterEntry (termtype,false), Decl_kinds.IsAssumption Decl_kinds.Logical)
in instance_hook k None false imps ?hook (ConstRef cst); id
end
else
begin
let props =
match props with
| CRecord (loc, _, fs) ->
if List.length fs > List.length k.cl_props then
mismatched_props env' (List.map snd fs) k.cl_props;
fs
| _ ->
if List.length k.cl_props <> 1 then
errorlabstrm "new_instance" (Pp.str "Expected a definition for the instance body")
else [(dummy_loc, Nameops.out_name (pi1 (List.hd k.cl_props))), props]
in
let subst =
match k.cl_props with
| [(na,b,ty)] ->
let term = match props with [] -> CHole (Util.dummy_loc, None)
| [(_,f)] -> f | _ -> assert false in
let ty' = substl subst ty in
let c = interp_casted_constr_evars evars env' term ty' in
c :: subst
| _ ->
let props, rest =
List.fold_left
(fun (props, rest) (id,b,_) ->
try
let ((loc, mid), c) = List.find (fun ((_,id'), c) -> Name id' = id) rest in
let rest' = List.filter (fun ((_,id'), c) -> Name id' <> id) rest 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)
([], props) k.cl_props
in
if rest <> [] then
unbound_method env' k.cl_impl (fst (List.hd rest))
else
type_ctx_instance evars env' k.cl_props props subst
in
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 =
let t = it_mkProd_or_LetIn ty_constr ctx' in
Evarutil.nf_isevar !evars t
in
let term = Termops.it_mkLambda_or_LetIn app ctx' in
evars := Evarutil.nf_evar_defs !evars;
let term = Evarutil.nf_isevar !evars term in
let evm = undefined_evars !evars in
Evarutil.check_evars env Evd.empty !evars termtype;
if Evd.is_empty evm then
declare_instance_constant k pri global imps ?hook id term termtype
else begin
evars := Typeclasses.resolve_typeclasses ~onlyargs:true ~fail:true env !evars;
let kind = Decl_kinds.Global, Decl_kinds.DefinitionBody Decl_kinds.Instance in
Flags.silently (fun () ->
Command.start_proof id kind termtype (fun _ -> instance_hook k pri global imps ?hook);
if props <> [] then
Pfedit.by (* (Refiner.tclTHEN (Refiner.tclEVARS ( !isevars)) *)
(!refine_ref (evm, term))
else if Flags.is_auto_intros () then
Pfedit.by (Refiner.tclDO len Tactics.intro);
(match tac with Some tac -> Pfedit.by tac | None -> ())) ();
Flags.if_verbose (msg $$ Printer.pr_open_subgoals) ();
id
end
end
let named_of_rel_context l =
let acc, ctx =
List.fold_right
(fun (na, b, t) (subst, ctx) ->
let id = match na with Anonymous -> raise (Invalid_argument "named_of_rel_context") | Name id -> id in
let d = (id, Option.map (substl subst) b, substl subst t) in
(mkVar id :: subst, d :: ctx))
l ([], [])
in ctx
let push_named_context = List.fold_right push_named
let rec list_filter_map f = function
| [] -> []
| hd :: tl -> match f hd with
| None -> list_filter_map f tl
| Some x -> x :: list_filter_map f tl
let context ?(hook=fun _ -> ()) l =
let env = Global.env() in
let evars = ref Evd.empty in
let (env', fullctx), impls = interp_context_evars evars env l in
let fullctx = Evarutil.nf_rel_context_evar !evars fullctx in
let ce t = Evarutil.check_evars env Evd.empty !evars t in
List.iter (fun (n, b, t) -> Option.iter ce b; ce t) fullctx;
let ctx = try named_of_rel_context fullctx with _ ->
error "Anonymous variables not allowed in contexts."
in
List.iter (function (id,_,t) ->
if Lib.is_modtype () then
let cst = Declare.declare_internal_constant id
(ParameterEntry (t,false), IsAssumption Logical)
in
match class_of_constr t with
| Some tc ->
add_instance (Typeclasses.new_instance tc None false (ConstRef cst));
hook (ConstRef cst)
| None -> ()
else (
let impl = List.exists (fun (x,_) ->
match x with ExplByPos (_, Some id') -> id = id' | _ -> false) impls
in
Command.declare_one_assumption false (Local (* global *), Definitional) t
[] impl (* implicit *) false (* inline *) (dummy_loc, id);
match class_of_constr t with
| None -> ()
| Some tc -> hook (VarRef id)))
(List.rev ctx)
|