| _ -> NCic.Appl (hd :: tl))
;;
-let flexible l =
- List.exists
- (function
- | NCic.Meta _
- | NCic.Appl (NCic.Meta _::_) -> true
- | _ -> false) l
-;;
-
exception WrongShape;;
-let eta_reduce =
- let delift_if_not_occur body orig =
+let eta_reduce subst t =
+ let delift_if_not_occur body =
try
- NCicSubstitution.psubst ~avoid_beta_redexes:true
- (fun () -> raise WrongShape) [()] body
- with WrongShape -> orig
+ Some (NCicSubstitution.psubst ~avoid_beta_redexes:true
+ (fun () -> raise WrongShape) [()] body)
+ with WrongShape -> None
+ in
+ let rec eat_lambdas ctx = function
+ | NCic.Lambda (name, src, tgt) ->
+ eat_lambdas ((name, src) :: ctx) tgt
+ | NCic.Meta (i,lc) as t->
+ (try
+ let _,_,t,_ = NCicUtils.lookup_subst i subst in
+ let t = NCicSubstitution.subst_meta lc t in
+ eat_lambdas ctx t
+ with Not_found -> ctx, t)
+ | t -> ctx, t
in
- function
- | NCic.Lambda(_, _, NCic.Appl [hd; NCic.Rel 1]) as orig ->
- delift_if_not_occur hd orig
- | NCic.Lambda(_, _, NCic.Appl (hd :: l)) as orig
- when HExtlib.list_last l = NCic.Rel 1 ->
- let body =
- let args, _ = HExtlib.split_nth (List.length l - 1) l in
- NCic.Appl (hd::args)
- in
- delift_if_not_occur body orig
- | t -> t
+ let context_body = eat_lambdas [] t in
+ let rec aux = function
+ | [],body -> body
+ | (name, src)::ctx, (NCic.Appl (hd::[NCic.Rel 1]) as bo) ->
+ (match delift_if_not_occur hd with
+ | None -> aux (ctx,NCic.Lambda(name,src, bo))
+ | Some bo -> aux (ctx,bo))
+ | (name, src)::ctx, (NCic.Appl args as bo)
+ when HExtlib.list_last args = NCic.Rel 1 ->
+ let args, _ = HExtlib.split_nth "NU 1" (List.length args - 1) args in
+ (match delift_if_not_occur (NCic.Appl args) with
+ | None -> aux (ctx,NCic.Lambda(name,src, bo))
+ | Some bo -> aux (ctx,bo))
+ | (name, src) :: ctx, t ->
+ aux (ctx,NCic.Lambda(name,src, t))
+ in
+ aux context_body
;;
-
+
module C = NCic;;
module Ref = NReference;;
aux () t
;;
-let rec beta_expand_many metasenv subst context t args =
+let is_locked n subst =
+ try
+ match NCicUtils.lookup_subst n subst with
+ | Some tag, _,_,_ when NCicMetaSubst.is_out_scope_tag tag -> true
+ | _ -> false
+ with NCicUtils.Subst_not_found _ -> false
+;;
+
+
+let rec lambda_intros metasenv subst context t args =
let tty = NCicTypeChecker.typeof ~metasenv ~subst context t in
let argsty = List.map (NCicTypeChecker.typeof ~metasenv ~subst context) args in
let rec mk_lambda context n = function
| [] ->
let metasenv, _, bo, _ =
- NCicMetaSubst.mk_meta metasenv context (`WithType tty) in
+ NCicMetaSubst.mk_meta metasenv context
+ (`WithType (NCicSubstitution.lift n tty))
+ in
metasenv, bo
| ty::tail ->
let name = "HBeta"^string_of_int n in
pp msg; assert false
in
let lty = NCicSubstitution.subst_meta lc ty in
- pp (lazy ("On the types: " ^
- NCicPp.ppterm ~metasenv ~subst ~context:ctx ty ^ " ~~~ " ^
- NCicPp.ppterm ~metasenv ~subst ~context lty ^ " === "
- ^ NCicPp.ppterm ~metasenv ~subst ~context ty_t));
- let metasenv,subst= unify test_eq_only metasenv subst context lty ty_t in
- metasenv, subst, t
+ match ty_t with
+ | NCic.Implicit _ ->
+ raise (UnificationFailure
+ (lazy "trying to unify a term with a type"))
+ | ty_t ->
+ pp (lazy ("On the types: " ^
+ NCicPp.ppterm ~metasenv ~subst ~context:ctx ty ^ " ~~~ " ^
+ NCicPp.ppterm ~metasenv ~subst ~context lty ^ " === "
+ ^ NCicPp.ppterm ~metasenv ~subst ~context ty_t));
+ let metasenv,subst =
+ unify test_eq_only metasenv subst context lty ty_t in
+ metasenv, subst, t
in
pp (lazy(string_of_int n ^ " := 111 = "^
NCicPp.ppterm ~metasenv ~subst ~context t));
let term2 = NCicSubstitution.subst_meta lc2 term in
unify hdb test_eq_only metasenv subst context term1 term2
with NCicUtils.Subst_not_found _-> raise (UnificationFailure msg))
+
+ | _, NCic.Meta (n, _) when is_locked n subst ->
+ (let (metasenv, subst), i =
+ match NCicReduction.whd ~subst context t1 with
+ | NCic.Appl (NCic.Meta (i,l)::args) when
+ not (NCicMetaSubst.flexible subst args)
+ ->
+ let metasenv, lambda_Mj =
+ lambda_intros metasenv subst context t1 args
+ in
+ unify hdb test_eq_only metasenv subst context
+ (C.Meta (i,l)) lambda_Mj,
+ i
+ | NCic.Meta (i,_) -> (metasenv, subst), i
+ | _ -> assert false
+ in
+ let t1 = NCicReduction.whd ~subst context t1 in
+ let j, lj =
+ match t1 with NCic.Meta (j,l) -> j, l | _ -> assert false
+ in
+ let metasenv, subst =
+ instantiate hdb test_eq_only metasenv subst context j lj t2 true
+ in
+ (try
+ let name, ctx, term, ty = NCicUtils.lookup_subst i subst in
+ let term = eta_reduce subst term in
+ let subst = List.filter (fun (j,_) -> j <> i) subst in
+ metasenv, ((i, (name, ctx, term, ty)) :: subst)
+ with Not_found -> assert false))
| C.Meta (n,lc), t ->
(try
with Invalid_argument _ ->
raise (fail_exc metasenv subst context t1 t2))
- | NCic.Appl (NCic.Meta (i,l)::args), _ when not (flexible args) ->
+ | NCic.Appl (NCic.Meta (i,l)::args), _ when
+ not (NCicMetaSubst.flexible subst args) ->
(* we verify that none of the args is a Meta,
since beta expanding w.r.t a metavariable makes no sense *)
- let metasenv, beta_expanded =
- beta_expand_many metasenv subst context t2 args
+ let metasenv, lambda_Mj =
+ lambda_intros metasenv subst context t1 args
in
let metasenv, subst =
unify hdb test_eq_only metasenv subst context
- (C.Meta (i,l)) beta_expanded
+ (C.Meta (i,l)) lambda_Mj
in
-
- (* .... eta_reduce ?i ... *)
+ let metasenv, subst =
unify hdb test_eq_only metasenv subst context t1 t2
+ in
+ (try
+ let name, ctx, term, ty = NCicUtils.lookup_subst i subst in
+ let term = eta_reduce subst term in
+ let subst = List.filter (fun (j,_) -> j <> i) subst in
+ metasenv, ((i, (name, ctx, term, ty)) :: subst)
+ with Not_found -> assert false)
- | _, NCic.Appl (NCic.Meta (i,l)::args) when not(flexible args) ->
- let metasenv, beta_expanded =
- beta_expand_many metasenv subst context t1 args
+ | _, NCic.Appl (NCic.Meta (i,l)::args) when
+ not(NCicMetaSubst.flexible subst args) ->
+ let metasenv, lambda_Mj =
+ lambda_intros metasenv subst context t2 args
in
let metasenv, subst =
unify hdb test_eq_only metasenv subst context
- beta_expanded (C.Meta (i,l))
+ lambda_Mj (C.Meta (i,l))
in
+ let metasenv, subst =
unify hdb test_eq_only metasenv subst context t1 t2
+ in
+ (try
+ let name, ctx, term, ty = NCicUtils.lookup_subst i subst in
+ let term = eta_reduce subst term in
+ let subst = List.filter (fun (j,_) -> j <> i) subst in
+ metasenv, ((i, (name, ctx, term, ty)) :: subst)
+ with Not_found -> assert false)
(* processing this case here we avoid a useless small delta step *)
| (C.Appl ((C.Const r1) as _hd1::tl1), C.Appl (C.Const r2::tl2))
let relevance = NCicEnvironment.get_relevance r1 in
let relevance = match r1 with
| Ref.Ref (_,Ref.Con (_,_,lno)) ->
- let _,relevance = HExtlib.split_nth lno relevance in
+ let relevance =
+ try snd (HExtlib.split_nth "NU 2" lno relevance)
+ with Failure _ -> []
+ in
HExtlib.mk_list false lno @ relevance
| _ -> relevance
in
(*D*) in outside(); rc with exn -> outside (); raise exn
;;
-let unify hdb =
+let unify hdb ?(test_eq_only=false) =
indent := "";
- unify hdb false;;
-
-
+ unify hdb test_eq_only;;
projects / helm.git / blobdiff