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)
+ with NCicUtils.Subst_not_found _ -> ctx, t)
| t -> ctx, t
in
let context_body = eat_lambdas [] t in
let ppcontext ~metasenv:_metasenv ~subst:_subst _context = "";;
let ppmetasenv ~subst:_subst _metasenv = "";;
-
-let fix_sorts swap exc t =
- let rec aux () = function
- | NCic.Sort (NCic.Type u) as orig ->
- if swap then
- match NCicEnvironment.sup u with
- | None ->
- prerr_endline ("no sup for " ^ NCicPp.ppterm ~metasenv:[] ~subst:[] ~context:[] orig) ;
- raise exc
- | Some u1 -> if u = u1 then orig else NCic.Sort (NCic.Type u1)
- else
- NCic.Sort (NCic.Type (
- match NCicEnvironment.sup NCicEnvironment.type0 with
- | Some x -> x
- | _ -> assert false))
- | NCic.Meta _ as orig -> orig
- | t -> NCicUtils.map (fun _ _ -> ()) () aux t
- in
- aux () t
-;;
+let ppterm ~metasenv ~subst ~context = NCicPp.ppterm ~metasenv ~subst ~context;;
+(* let ppterm ~metasenv:_ ~subst:_ ~context:_ _ = "";; *)
let is_locked n subst =
try
;;
let rec lambda_intros rdb metasenv subst context argsno ty =
- pp (lazy ("LAMBDA INTROS: " ^ NCicPp.ppterm ~metasenv ~subst ~context ty));
+ pp (lazy ("LAMBDA INTROS: " ^ ppterm ~metasenv ~subst ~context ty));
match argsno with
0 ->
let metasenv, _, bo, _ =
- NCicMetaSubst.mk_meta metasenv context (`WithType ty)
+ NCicMetaSubst.mk_meta metasenv context ~with_type:ty `IsTerm
in
metasenv, bo
| _ ->
metasenv,C.Lambda (n,so,bo)
| _ -> assert false)
;;
+
+let unopt exc = function None -> raise exc | Some x -> x ;;
+
+let fix metasenv subst is_sup test_eq_only exc t =
+ (*D*) inside 'f'; try let rc =
+ pp (lazy (NCicPp.ppterm ~metasenv ~subst ~context:[] t));
+ let rec aux test_eq_only metasenv = function
+ | NCic.Prod (n,so,ta) ->
+ let metasenv,so = aux true metasenv so in
+ let metasenv,ta = aux test_eq_only metasenv ta in
+ metasenv,NCic.Prod (n,so,ta)
+ | NCic.Sort (NCic.Type [(`CProp|`Type),_]) as orig when test_eq_only ->
+ metasenv,orig
+ | NCic.Sort (NCic.Type _) when test_eq_only -> raise exc
+ | NCic.Sort (NCic.Type u) when is_sup ->
+ metasenv, NCic.Sort (NCic.Type (unopt exc (NCicEnvironment.sup u)))
+ | NCic.Sort (NCic.Type u) ->
+ metasenv, NCic.Sort (NCic.Type
+ (unopt exc (NCicEnvironment.inf ~strict:false u)))
+ | NCic.Meta (n,_) as orig ->
+ (try
+ let _,_,_,_ = NCicUtils.lookup_subst n subst in metasenv,orig
+ with NCicUtils.Subst_not_found _ ->
+ let metasenv, _ = NCicMetaSubst.extend_meta metasenv n in
+ metasenv, orig)
+ | t ->
+ NCicUntrusted.map_term_fold_a (fun _ x -> x) test_eq_only aux metasenv t
+ in
+ aux test_eq_only metasenv t
+ (*D*) in outside None; rc with exn -> outside (Some exn); raise exn
+;;
+
+let metasenv_to_subst n (kind,context,ty) metasenv subst =
+ let infos,metasenv = List.partition (fun (n',_) -> n = n') metasenv in
+ let attrs,octx,oty = match infos with [_,infos] -> infos | _ -> assert false in
+ if octx=context && oty=ty then
+ (n,(NCicUntrusted.set_kind kind attrs, octx, oty))::metasenv,subst
+ else
+ let metasenv, _, bo, _ =
+ NCicMetaSubst.mk_meta metasenv context ~attrs ~with_type:ty kind in
+ let subst = (n,(NCicUntrusted.set_kind kind attrs,octx,bo,oty))::subst in
+ metasenv,subst
+;;
+
+let rec sortfy exc metasenv subst context t =
+ let t = NCicReduction.whd ~subst context t in
+ let metasenv,subst =
+ match t with
+ | NCic.Sort _ -> metasenv, subst
+ | NCic.Meta (n,_) ->
+ let attrs, context, ty = NCicUtils.lookup_meta n metasenv in
+ let kind = NCicUntrusted.kind_of_meta attrs in
+ if kind = `IsSort then
+ metasenv,subst
+ else
+ (match ty with
+ | NCic.Implicit (`Typeof _) ->
+ metasenv_to_subst n (`IsSort,[],ty) metasenv subst
+ | ty ->
+ let metasenv,subst,ty = sortfy exc metasenv subst context ty in
+ metasenv_to_subst n (`IsSort,[],ty) metasenv subst)
+ | NCic.Implicit _ -> assert false
+ | _ -> raise exc
+ in
+ metasenv,subst,t
+
+let tipify exc metasenv subst context t ty =
+ let is_type attrs =
+ match NCicUntrusted.kind_of_meta attrs with
+ `IsType | `IsSort -> true
+ | `IsTerm -> false
+ in
+ let rec optimize_meta metasenv subst =
+ function
+ NCic.Meta (n,lc) ->
+ (try
+ let attrs,_,_ = NCicUtils.lookup_meta n metasenv in
+ if is_type attrs then
+ metasenv,subst,true
+ else
+ let _,cc,ty = NCicUtils.lookup_meta n metasenv in
+ let metasenv,subst,ty = sortfy exc metasenv subst cc ty in
+ let metasenv =
+ NCicUntrusted.replace_in_metasenv n
+ (fun attrs,cc,_ -> NCicUntrusted.set_kind `IsType attrs, cc, ty)
+ metasenv
+ in
+ metasenv,subst,false
+ with
+ NCicUtils.Meta_not_found _ ->
+ let attrs, _,bo,_ = NCicUtils.lookup_subst n subst in
+ if is_type attrs then
+ metasenv,subst,true
+ else
+ let _,cc,_,ty = NCicUtils.lookup_subst n subst in
+ let metasenv,subst,ty = sortfy exc metasenv subst cc ty in
+ let subst =
+ NCicUntrusted.replace_in_subst n
+ (fun attrs,cc,bo,_->NCicUntrusted.set_kind `IsType attrs,cc,bo,ty)
+ subst
+ in
+ optimize_meta metasenv subst (NCicSubstitution.subst_meta lc bo))
+ | _ -> metasenv,subst,false
+ in
+ let metasenv,subst,b = optimize_meta metasenv subst t in
+ if b then
+ metasenv,subst,t
+ else
+ let metasenv,subst,_ = sortfy exc metasenv subst context ty in
+ metasenv,subst,t
+;;
let rec instantiate rdb test_eq_only metasenv subst context n lc t swap =
(*D*) inside 'I'; try let rc =
- pp (lazy(string_of_int n ^ " :=?= "^
- NCicPp.ppterm ~metasenv ~subst ~context t));
- let unify test_eq_only m s c t1 t2 =
- if swap then unify rdb test_eq_only m s c t2 t1
- else unify rdb test_eq_only m s c t1 t2
+ pp (lazy(string_of_int n^" :=?= "^ppterm ~metasenv ~subst ~context t));
+ let exc =
+ UnificationFailure (mk_msg metasenv subst context (NCic.Meta (n,lc)) t) in
+ let move_to_subst i ((_,cc,t,_) as infos) metasenv subst =
+ let metasenv = List.remove_assoc i metasenv in
+ pp(lazy(string_of_int n ^ " :==> "^ ppterm ~metasenv ~subst ~context:cc t));
+ metasenv, (i,infos) :: subst
in
- let has_tag = List.exists in
- let tags, _, ty = NCicUtils.lookup_meta n metasenv in
- (* on the types *)
- let metasenv, subst, t =
- match ty with
- | NCic.Implicit (`Typeof _) ->
- pp(lazy("meta with no type"));
- assert(has_tag ((=)`IsSort) tags);
- metasenv, subst, t
- | _ ->
- let exc_to_be =
- UnificationFailure (mk_msg metasenv subst context (NCic.Meta (n,lc)) t)
- in
- let t, ty_t =
- try t, NCicTypeChecker.typeof ~subst ~metasenv context t
- with
- | NCicTypeChecker.AssertFailure msg as exn ->
- pp(lazy("we try to fix the sort\n"^
- Lazy.force msg^"\n"^NCicPp.ppmetasenv ~subst metasenv));
- let ft = fix_sorts swap exc_to_be t in
- pp(lazy("unable to fix the sort"));
- if ft == t then raise exn;
- (try ft, NCicTypeChecker.typeof ~subst ~metasenv context ft
- with NCicTypeChecker.AssertFailure _ -> raise exn)
- | NCicTypeChecker.TypeCheckerFailure msg ->
- prerr_endline (Lazy.force msg);
- prerr_endline (NCicPp.ppterm ~metasenv ~subst ~context t);
- prerr_endline (ppcontext ~metasenv ~subst context);
- prerr_endline (ppmetasenv ~subst metasenv);
- assert false
- in
- match ty_t with
- | NCic.Implicit (`Typeof _) ->
- raise (UnificationFailure(lazy "trying to unify a term with a type"))
- | _ ->
- let lty = NCicSubstitution.subst_meta lc ty in
- pp (lazy ("On the types: " ^
- NCicPp.ppterm ~metasenv ~subst ~context lty ^ " === " ^
- NCicPp.ppterm ~metasenv ~subst ~context ty_t));
- let metasenv,subst =
- try unify test_eq_only metasenv subst context lty ty_t
- with NCicEnvironment.BadConstraint _ as exc ->
- let ty_t = fix_sorts swap exc_to_be ty_t in
- try unify test_eq_only metasenv subst context lty ty_t
- with
- | NCicEnvironment.BadConstraint _
- | UnificationFailure _ -> raise exc
- in
- metasenv, subst, t
- in
- (* viral sortification *)
- let is_sort metasenv subst context t =
- match NCicReduction.whd ~subst context t with
- | NCic.Meta (i,_) ->
- let tags, _, _ = NCicUtils.lookup_meta i metasenv in
- has_tag ((=) `IsSort) tags
- | NCic.Sort _ -> true
- | _ -> false
- in
- let rec sortify metasenv subst = function
- | NCic.Implicit (`Typeof _) -> assert false
- | NCic.Sort _ as t -> metasenv, subst, t, 0
- | NCic.Meta (i,_) as t ->
- let tags, context, ty = NCicUtils.lookup_meta i metasenv in
- if has_tag ((=) `IsSort) tags then metasenv, subst, t, i
- else
- let ty = NCicReduction.whd ~subst context ty in
- let metasenv, subst, ty, _ = sortify metasenv subst ty in
- let metasenv, j, m, _ =
- NCicMetaSubst.mk_meta metasenv ~attrs:[`IsSort] [] (`WithType ty)
- in
- pp(lazy("rimpiazzo " ^ string_of_int i^" con "^string_of_int j));
- let subst_entry = i, (tags, context, m, ty) in
- let subst = subst_entry :: subst in
- let metasenv = List.filter (fun x,_ -> i <> x) metasenv in
- metasenv, subst, m, j
- | NCic.Appl (NCic.Meta _ as hd :: args) as t ->
- let metasenv, lambda_Mj =
- lambda_intros rdb metasenv subst context (List.length args)
- (NCicTypeChecker.typeof ~metasenv ~subst context hd)
+ let delift_to_subst test_eq_only n lc (attrs,cc,ty) t context metasenv subst =
+ pp (lazy(string_of_int n ^ " := 111 = "^
+ ppterm ~metasenv ~subst ~context t));
+ let (metasenv, subst), t =
+ try
+ NCicMetaSubst.delift
+ ~unify:(fun m s c t1 t2 ->
+ let ind = !indent in
+ let res =
+ try Some (unify rdb test_eq_only m s c t1 t2 false)
+ with UnificationFailure _ | Uncertain _ -> None
in
- let metasenv,subst= unify true metasenv subst context hd lambda_Mj in
- let t = NCicReduction.whd ~subst context t in
- let _result = sortify metasenv subst t in
- (* untested, maybe dead, code *) assert false;
- | t ->
- if could_reduce t then raise (Uncertain(lazy "not a sort"))
- else raise (UnificationFailure(lazy "not a sort"))
- in
- let metasenv, subst, _, n =
- if has_tag ((=) `IsSort) tags then
- let m,s,x,_ = sortify metasenv subst (NCicReduction.whd ~subst context t)
- in m,s,x,n
- else if is_sort metasenv subst context t then
- sortify metasenv subst (NCic.Meta (n,lc))
- else
- metasenv, subst, NCic.Rel ~-1,n
- in
- let tags, ctx, ty = NCicUtils.lookup_meta n metasenv in
- (* instantiation *)
- pp (lazy(string_of_int n ^ " := 111 = "^
- NCicPp.ppterm ~metasenv ~subst ~context t));
- let (metasenv, subst), t =
- try
- NCicMetaSubst.delift
- ~unify:(fun m s c t1 t2 ->
- let ind = !indent in
- let res =
- try Some (unify test_eq_only m s c t1 t2 )
- with UnificationFailure _ | Uncertain _ -> None
- in
- indent := ind; res)
- metasenv subst context n lc t
- with NCicMetaSubst.Uncertain msg ->
- pp (lazy ("delift fails: " ^ Lazy.force msg));
- raise (Uncertain msg)
- | NCicMetaSubst.MetaSubstFailure msg ->
- pp (lazy ("delift fails: " ^ Lazy.force msg));
- raise (UnificationFailure msg)
- in
- pp (lazy(string_of_int n ^ " := 222 = "^
- NCicPp.ppterm ~metasenv ~subst ~context:ctx t
- ^ ppmetasenv ~subst metasenv));
- (* Unifying the types may have already instantiated n. *)
- try
- let _, _,oldt,_ = NCicUtils.lookup_subst n subst in
- let oldt = NCicSubstitution.subst_meta lc oldt in
- let t = NCicSubstitution.subst_meta lc t in
- (* conjecture: always fail --> occur check *)
- unify test_eq_only metasenv subst context oldt t
- with NCicUtils.Subst_not_found _ ->
- let metasenv, tags =
- let rec aux = function
- | NCic.Meta (j,lc) ->
- (try
- let _, _, t, _ = NCicUtils.lookup_subst j subst in
- aux (NCicSubstitution.subst_meta lc t)
- with NCicUtils.Subst_not_found _ ->
- let tags', ctx, ty = NCicUtils.lookup_meta j metasenv in
- let metasenv = List.remove_assoc j metasenv in
- let tags = tags @ tags' in
- (j, (tags, ctx, ty)) :: metasenv, tags)
- | _ -> metasenv, tags
- in
- aux t
+ indent := ind; res)
+ metasenv subst context n lc t
+ with NCicMetaSubst.Uncertain msg ->
+ pp (lazy ("delift is uncertain: " ^ Lazy.force msg));
+ raise (Uncertain msg)
+ | NCicMetaSubst.MetaSubstFailure msg ->
+ pp (lazy ("delift fails: " ^ Lazy.force msg));
+ raise (UnificationFailure msg)
in
- (* by cumulativity when unify(?,Type_i)
- * we could ? := Type_j with j <= i... *)
- let subst = (n, (tags, ctx, t, ty)) :: subst in
- pp (lazy ("?"^string_of_int n^" := "^NCicPp.ppterm
- ~metasenv ~subst ~context (NCicSubstitution.subst_meta lc t)));
- let metasenv =
- List.filter (fun (m,_) -> not (n = m)) metasenv
- in
- metasenv, subst
+ pp (lazy(string_of_int n ^ " := 222 = "^
+ ppterm ~metasenv ~subst ~context:cc t^ppmetasenv ~subst metasenv));
+ (* Unifying the types may have already instantiated n. *)
+ try
+ let _, _,oldt,_ = NCicUtils.lookup_subst n subst in
+ let oldt = NCicSubstitution.subst_meta lc oldt in
+ let t = NCicSubstitution.subst_meta lc t in
+ (* conjecture: always fail --> occur check *)
+ unify rdb test_eq_only metasenv subst context t oldt false
+ with NCicUtils.Subst_not_found _ ->
+ move_to_subst n (attrs,cc,t,ty) metasenv subst
+ in
+ let attrs,cc,ty = NCicUtils.lookup_meta n metasenv in
+ let kind = NCicUntrusted.kind_of_meta attrs in
+ let metasenv,t = fix metasenv subst swap test_eq_only exc t in
+ let ty_t = NCicTypeChecker.typeof ~metasenv ~subst context t in
+ let metasenv,subst,t =
+ match kind with
+ `IsSort -> sortfy exc metasenv subst context t
+ | `IsType -> tipify exc metasenv subst context t ty_t
+ | `IsTerm -> metasenv,subst,t in
+ match kind with
+ | `IsSort ->
+ (match ty,t with
+ NCic.Implicit (`Typeof _), NCic.Sort _ ->
+ move_to_subst n (attrs,cc,t,ty_t) metasenv subst
+ | NCic.Sort (NCic.Type u1), NCic.Sort s ->
+ let s =
+ match s,swap with
+ NCic.Type u2, false ->
+ NCic.Sort (NCic.Type
+ (unopt exc (NCicEnvironment.inf ~strict:false
+ (unopt exc (NCicEnvironment.inf ~strict:true u1) @ u2))))
+ | NCic.Type u2, true ->
+ if NCicEnvironment.universe_lt u2 u1 then
+ NCic.Sort (NCic.Type u2)
+ else (raise exc)
+ | NCic.Prop,_ -> NCic.Sort NCic.Prop
+ in
+ move_to_subst n (attrs,cc,s,ty) metasenv subst
+ | NCic.Implicit (`Typeof _), NCic.Meta _ ->
+ move_to_subst n (attrs,cc,t,ty_t) metasenv subst
+ | _, NCic.Meta _
+ | NCic.Meta _, NCic.Sort _ ->
+ pp (lazy ("On the types: " ^
+ ppterm ~metasenv ~subst ~context ty ^ "=<=" ^
+ ppterm ~metasenv ~subst ~context ty_t));
+ let metasenv, subst =
+ unify rdb false metasenv subst context ty_t ty false in
+ delift_to_subst test_eq_only n lc (attrs,cc,ty) t
+ context metasenv subst
+ | _ -> assert false)
+ | `IsType
+ | `IsTerm ->
+ (match ty with
+ NCic.Implicit (`Typeof _) ->
+ let (metasenv, subst), ty_t =
+ try
+ NCicMetaSubst.delift
+ ~unify:(fun m s c t1 t2 ->
+ let ind = !indent in
+ let res = try Some (unify rdb test_eq_only m s c t1 t2 false )
+ with UnificationFailure _ | Uncertain _ -> None
+ in
+ indent := ind; res)
+ metasenv subst context n lc ty_t
+ with NCicMetaSubst.Uncertain msg ->
+ pp (lazy ("delift is uncertain: " ^ Lazy.force msg));
+ raise (Uncertain msg)
+ | NCicMetaSubst.MetaSubstFailure msg ->
+ pp (lazy ("delift fails: " ^ Lazy.force msg));
+ raise (UnificationFailure msg)
+ in
+ delift_to_subst test_eq_only n lc (attrs,cc,ty_t) t context metasenv
+ subst
+ | _ ->
+ let lty = NCicSubstitution.subst_meta lc ty in
+ pp (lazy ("On the types: " ^
+ ppterm ~metasenv ~subst ~context lty ^ "=<=" ^
+ ppterm ~metasenv ~subst ~context ty_t));
+ let metasenv, subst =
+ unify rdb false metasenv subst context ty_t lty false
+ in
+ delift_to_subst test_eq_only n lc (attrs,cc,ty) t context metasenv
+ subst)
(*D*) in outside None; rc with exn -> outside (Some exn); raise exn
-and unify rdb test_eq_only metasenv subst context t1 t2 =
+and unify rdb test_eq_only metasenv subst context t1 t2 swap =
(*D*) inside 'U'; try let rc =
let fo_unif test_eq_only metasenv subst (norm1,t1) (norm2,t2) =
(*D*) inside 'F'; try let rc =
- pp (lazy(" " ^ NCicPp.ppterm ~metasenv ~subst ~context t1 ^ " ==?== " ^
- NCicPp.ppterm ~metasenv ~subst ~context t2 ^ ppmetasenv
+ pp (lazy(" " ^ ppterm ~metasenv ~subst ~context t1 ^
+ (if swap then " ==>?== "
+ else " ==<?==" ) ^
+ ppterm ~metasenv ~subst ~context t2 ^ ppmetasenv
~subst metasenv));
- pp (lazy(" " ^ NCicPp.ppterm ~metasenv ~subst:[] ~context t1 ^ " ==??== " ^
- NCicPp.ppterm ~metasenv ~subst:[] ~context t2 ^ ppmetasenv
+ pp (lazy(" " ^ ppterm ~metasenv ~subst:[] ~context t1 ^
+ (if swap then " ==>??== "
+ else " ==<??==" ) ^
+ ppterm ~metasenv ~subst:[] ~context t2 ^ ppmetasenv
~subst metasenv));
if t1 === t2 then
metasenv, subst
+(* CSC: To speed up Oliboni's stuff. Why is it necessary, anyway?
+ else if
+ NCicUntrusted.metas_of_term subst context t1 = [] &&
+ NCicUntrusted.metas_of_term subst context t2 = []
+ then
+ if NCicReduction.are_convertible ~metasenv ~subst context t1 t2 then
+ metasenv,subst
+ else
+ raise (UnificationFailure (lazy "Closed terms not convertible"))
+*)
else
match (t1,t2) with
| C.Appl [_], _ | _, C.Appl [_] | C.Appl [], _ | _, C.Appl []
| C.Appl (C.Appl _::_), _ | _, C.Appl (C.Appl _::_) ->
prerr_endline "Appl [Appl _;_] or Appl [] or Appl [_] invariant";
assert false
- | (C.Sort (C.Type a), C.Sort (C.Type b)) when not test_eq_only ->
+ | (C.Sort (C.Type a), C.Sort (C.Type b)) when not test_eq_only ->
+ let a, b = if swap then b,a else a,b in
if NCicEnvironment.universe_leq a b then metasenv, subst
else raise (UnificationFailure (mk_msg metasenv subst context t1 t2))
| (C.Sort (C.Type a), C.Sort (C.Type b)) ->
if NCicEnvironment.universe_eq a b then metasenv, subst
else raise (UnificationFailure (mk_msg metasenv subst context t1 t2))
- | (C.Sort C.Prop,C.Sort (C.Type _)) ->
+ | (C.Sort C.Prop,C.Sort (C.Type _)) when not swap ->
+ if (not test_eq_only) then metasenv, subst
+ else raise (UnificationFailure (mk_msg metasenv subst context t1 t2))
+ | (C.Sort (C.Type _), C.Sort C.Prop) when swap ->
if (not test_eq_only) then metasenv, subst
else raise (UnificationFailure (mk_msg metasenv subst context t1 t2))
| (C.Lambda (name1,s1,t1), C.Lambda(_,s2,t2))
| (C.Prod (name1,s1,t1), C.Prod(_,s2,t2)) ->
- let metasenv, subst = unify rdb true metasenv subst context s1 s2 in
- unify rdb test_eq_only metasenv subst ((name1, C.Decl s1)::context) t1 t2
+ let metasenv, subst = unify rdb true metasenv subst context s1 s2 swap in
+ unify rdb test_eq_only metasenv subst ((name1, C.Decl s1)::context) t1 t2 swap
| (C.LetIn (name1,ty1,s1,t1), C.LetIn(_,ty2,s2,t2)) ->
- let metasenv,subst=unify rdb test_eq_only metasenv subst context ty1 ty2 in
- let metasenv,subst=unify rdb test_eq_only metasenv subst context s1 s2 in
+ let metasenv,subst=unify rdb test_eq_only metasenv subst context ty1 ty2 swap in
+ let metasenv,subst=unify rdb test_eq_only metasenv subst context s1 s2 swap in
let context = (name1, C.Def (s1,ty1))::context in
- unify rdb test_eq_only metasenv subst context t1 t2
+ unify rdb test_eq_only metasenv subst context t1 t2 swap
| (C.Meta (n1,(s1,l1 as lc1)),C.Meta (n2,(s2,l2 as lc2))) when n1 = n2 ->
(try
(fun t1 t2 (metasenv, subst, to_restrict, i) ->
try
let metasenv, subst =
- unify rdb test_eq_only metasenv subst context
+ unify rdb (*test_eq_only*) true metasenv subst context
(NCicSubstitution.lift s1 t1) (NCicSubstitution.lift s2 t2)
+ swap
in
metasenv, subst, to_restrict, i-1
with UnificationFailure _ | Uncertain _ ->
l1 l2 (metasenv, subst, [], List.length l1)
in
if to_restrict <> [] then
- let metasenv, subst, _ =
+ let metasenv, subst, _, _ =
NCicMetaSubst.restrict metasenv subst n1 to_restrict
in
metasenv, subst
let _,_,term,_ = NCicUtils.lookup_subst n1 subst in
let term1 = NCicSubstitution.subst_meta lc1 term in
let term2 = NCicSubstitution.subst_meta lc2 term in
- unify rdb test_eq_only metasenv subst context term1 term2
+ unify rdb test_eq_only metasenv subst context term1 term2 swap
with NCicUtils.Subst_not_found _-> raise (UnificationFailure msg))
| NCic.Appl (NCic.Meta (i,_)::_ as l1),
(try
List.fold_left2
(fun (metasenv, subst) t1 t2 ->
- unify rdb test_eq_only metasenv subst context t1 t2)
+ unify rdb (*test_eq_only*) true metasenv subst context t1
+ t2 swap)
(metasenv,subst) l1 l2
with Invalid_argument _ ->
raise (UnificationFailure (mk_msg metasenv subst context t1 t2)))
- | _, NCic.Meta (n, _) when is_locked n subst ->
+ | _, NCic.Meta (n, _) when is_locked n subst && not swap->
(let (metasenv, subst), i =
match NCicReduction.whd ~subst context t1 with
| NCic.Appl (NCic.Meta (i,l) as meta :: args) ->
(NCicTypeChecker.typeof ~metasenv ~subst context meta)
in
unify rdb test_eq_only metasenv subst context
- (C.Meta (i,l)) lambda_Mj,
+ (C.Meta (i,l)) lambda_Mj false,
i
| NCic.Meta (i,_) -> (metasenv, subst), i
| _ ->
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 when List.mem_assoc n subst ->
- let _,_,term,_ = NCicUtils.lookup_subst n subst in
- let term = NCicSubstitution.subst_meta lc term in
- unify rdb test_eq_only metasenv subst context term t
+ | NCic.Meta (n, _), _ when is_locked n subst && swap ->
+ unify rdb test_eq_only metasenv subst context t2 t1 false
| t, C.Meta (n,lc) when List.mem_assoc n subst ->
let _,_,term,_ = NCicUtils.lookup_subst n subst in
let term = NCicSubstitution.subst_meta lc term in
- unify rdb test_eq_only metasenv subst context t term
-
- | NCic.Appl (NCic.Meta (i,l)::args), _ when List.mem_assoc i subst ->
- let _,_,term,_ = NCicUtils.lookup_subst i subst in
- let term = NCicSubstitution.subst_meta l term in
- unify rdb test_eq_only metasenv subst context
- (mk_appl ~upto:(List.length args) term args) t2
+ unify rdb test_eq_only metasenv subst context t term swap
+ | C.Meta (n,_), _ when List.mem_assoc n subst ->
+ unify rdb test_eq_only metasenv subst context t2 t1 (not swap)
| _, NCic.Appl (NCic.Meta (i,l)::args) when List.mem_assoc i subst ->
let _,_,term,_ = NCicUtils.lookup_subst i subst in
let term = NCicSubstitution.subst_meta l term in
unify rdb test_eq_only metasenv subst context t1
- (mk_appl ~upto:(List.length args) term args)
-
+ (mk_appl ~upto:(List.length args) term args) swap
+ | NCic.Appl (NCic.Meta (i,_)::_), _ when List.mem_assoc i subst ->
+ unify rdb test_eq_only metasenv subst context t2 t1 (not swap)
+
+ | C.Meta (n,_), C.Meta (m,lc') when
+ let _,cc1,_ = NCicUtils.lookup_meta n metasenv in
+ let _,cc2,_ = NCicUtils.lookup_meta m metasenv in
+ (n < m && cc1 = cc2) ||
+ let len1 = List.length cc1 in
+ let len2 = List.length cc2 in
+ len2 < len1 && cc2 = fst (HExtlib.split_nth len2 cc1) ->
+ instantiate rdb test_eq_only metasenv subst context m lc'
+ (NCicReduction.head_beta_reduce ~subst t1) (not swap)
| C.Meta (n,lc), t ->
instantiate rdb test_eq_only metasenv subst context n lc
- (NCicReduction.head_beta_reduce ~subst t) false
-
+ (NCicReduction.head_beta_reduce ~subst t) swap
| t, C.Meta (n,lc) ->
instantiate rdb test_eq_only metasenv subst context n lc
- (NCicReduction.head_beta_reduce ~subst t) true
+ (NCicReduction.head_beta_reduce ~subst t) (not swap)
| NCic.Appl (NCic.Meta (i,l) as meta :: args), _ ->
let metasenv, lambda_Mj =
(NCicTypeChecker.typeof ~metasenv ~subst context meta)
in
let metasenv, subst =
- try
- unify rdb test_eq_only metasenv subst context
- (C.Meta (i,l)) lambda_Mj
- with UnificationFailure msg | Uncertain msg when not norm2->
- (* failure: let's try again argument vs argument *)
- raise (KeepReducing msg)
+ unify rdb test_eq_only metasenv subst context
+ (C.Meta (i,l)) lambda_Mj swap
in
let metasenv, subst =
- unify rdb test_eq_only metasenv subst context t1 t2
+ unify rdb test_eq_only metasenv subst context t1 t2 swap
in
(try
let name, ctx, term, ty = NCicUtils.lookup_subst i subst 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) as meta :: args) ->
- let metasenv, lambda_Mj =
- lambda_intros rdb metasenv subst context (List.length args)
- (NCicTypeChecker.typeof ~metasenv ~subst context meta)
- in
- let metasenv, subst =
- try
- unify rdb test_eq_only metasenv subst context
- lambda_Mj (C.Meta (i,l))
- with UnificationFailure msg | Uncertain msg when not norm1 ->
- (* failure: let's try again argument vs argument *)
- raise (KeepReducing msg)
- in
- let metasenv, subst =
- unify rdb 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 (_,_) :: _) ->
+ unify rdb test_eq_only metasenv subst context t2 t1 (not swap)
(* 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))
match relevance with b::tl -> b,tl | _ -> true, [] in
let metasenv, subst =
try unify rdb test_eq_only metasenv subst context t1 t2
+ swap
with UnificationFailure _ | Uncertain _ when not b ->
metasenv, subst
in
with
Invalid_argument _ ->
raise (Uncertain (mk_msg metasenv subst context t1 t2))
- | UnificationFailure _ | Uncertain _ when not (norm1 && norm2) ->
- raise (KeepReducing (mk_msg metasenv subst context t1 t2))
| KeepReducing _ | KeepReducingThis _ -> assert false
in
metasenv, subst
| (C.Match (Ref.Ref (_,Ref.Ind (_,tyno,_)) as ref1,outtype1,term1,pl1),
- C.Match (ref2,outtype2,term2,pl2)) ->
+ C.Match (ref2,outtype2,term2,pl2)) when Ref.eq ref1 ref2 ->
let _,_,itl,_,_ = NCicEnvironment.get_checked_indtys ref1 in
let _,_,ty,_ = List.nth itl tyno in
let rec remove_prods ~subst context ty =
| C.Sort C.Prop -> true
| _ -> false
in
- if not (Ref.eq ref1 ref2) then
+ (* if not (Ref.eq ref1 ref2) then
raise (Uncertain (mk_msg metasenv subst context t1 t2))
- else
+ else*)
let metasenv, subst =
- unify rdb test_eq_only metasenv subst context outtype1 outtype2 in
+ unify rdb test_eq_only metasenv subst context outtype1 outtype2 swap in
let metasenv, subst =
- try unify rdb test_eq_only metasenv subst context term1 term2
+ try unify rdb test_eq_only metasenv subst context term1 term2 swap
with UnificationFailure _ | Uncertain _ when is_prop ->
metasenv, subst
in
(try
List.fold_left2
- (fun (metasenv,subst) ->
- unify rdb test_eq_only metasenv subst context)
+ (fun (metasenv,subst) t1 t2 ->
+ unify rdb test_eq_only metasenv subst context t1 t2 swap)
(metasenv, subst) pl1 pl2
with Invalid_argument _ -> assert false)
| (C.Implicit _, _) | (_, C.Implicit _) -> assert false
| _ -> raise (KeepReducing (mk_msg metasenv subst context t1 t2))
(*D*) in outside None; rc with exn -> outside (Some exn); raise exn
in
+ let fo_unif test_eq_only metasenv subst (norm1,t1 as nt1) (norm2,t2 as nt2)=
+ try fo_unif test_eq_only metasenv subst nt1 nt2
+ with
+ UnificationFailure _ | Uncertain _ when not norm1 || not norm2 ->
+ raise (KeepReducing (mk_msg metasenv subst context t1 t2))
+ in
let try_hints metasenv subst (_,t1 as mt1) (_,t2 as mt2) (* exc*) =
(*D*) inside 'H'; try let rc =
pp(lazy ("\nProblema:\n" ^
- NCicPp.ppterm ~metasenv ~subst ~context t1 ^ " =?= " ^
- NCicPp.ppterm ~metasenv ~subst ~context t2));
+ ppterm ~metasenv ~subst ~context t1 ^ " =?= " ^
+ ppterm ~metasenv ~subst ~context t2));
let candidates =
NCicUnifHint.look_for_hint rdb metasenv subst context t1 t2
in
String.concat "\n"
(List.map
(fun (a,b) ->
- NCicPp.ppterm ~metasenv ~subst ~context a ^ " =?= " ^
- NCicPp.ppterm ~metasenv ~subst ~context b) premises) ^
+ ppterm ~metasenv ~subst ~context a ^ " =?= " ^
+ ppterm ~metasenv ~subst ~context b) premises) ^
"\n-------------------------------------------\n"^
- NCicPp.ppterm ~metasenv ~subst ~context c1 ^ " = " ^
- NCicPp.ppterm ~metasenv ~subst ~context c2));
+ ppterm ~metasenv ~subst ~context c1 ^ " = " ^
+ ppterm ~metasenv ~subst ~context c2));
try
(*D*) inside 'K'; try let rc =
let metasenv,subst =
let metasenv,subst =
List.fold_left
(fun (metasenv, subst) (x,y) ->
- unify rdb test_eq_only metasenv subst context x y)
+ unify rdb test_eq_only metasenv subst context x y false)
(metasenv, subst) premises
in
pp(lazy("FUNZIONA!"));
NCicReduction.reduce_machine ~delta:max_int ~subst context m1,
NCicReduction.reduce_machine ~delta:max_int ~subst context m2
in
- let fo_unif_w_hints test_eq_only metasenv subst (xx1,t1 as m1) (xx2,t2 as m2) =
+ let fo_unif_w_hints test_eq_only metasenv subst (_,t1 as m1) (_,t2 as m2) =
try fo_unif test_eq_only metasenv subst m1 m2
with
| UnificationFailure _ as exn -> raise exn
| ((k1,e1,t1,s1),norm1 as m1),((k2,e2,t2,s2),norm2 as m2) ->
(*D*) inside 'M'; try let rc =
pp (lazy("UM: " ^
- NCicPp.ppterm ~metasenv ~subst ~context
+ ppterm ~metasenv ~subst ~context
(NCicReduction.unwind (k1,e1,t1,s1)) ^
" === " ^
- NCicPp.ppterm ~metasenv ~subst ~context
+ ppterm ~metasenv ~subst ~context
(NCicReduction.unwind (k2,e2,t2,s2))));
pp (lazy (string_of_bool norm1 ^ " ?? " ^ string_of_bool norm2));
let relevance = [] (* TO BE UNDERSTOOD
~unify:(fun m s c t1 t2 ->
let ind = !indent in
let res =
- try Some (unify rdb false m s c t1 t2 )
+ try Some (unify rdb false m s c t1 t2 false)
with UnificationFailure _ | Uncertain _ -> None
in
indent := ind; res)
;;
-let unify rdb ?(test_eq_only=false) =
+let unify rdb ?(test_eq_only=false) ?(swap=false) metasenv subst context t1 t2=
indent := "";
- unify rdb test_eq_only;;
+ unify rdb test_eq_only metasenv subst context t1 t2 swap;;
-let fix_sorts = fix_sorts true (UnificationFailure (lazy "no sup"));;
+let fix_sorts m s =
+ fix m s true false (UnificationFailure (lazy "no sup"))
+;;
projects / helm.git / blobdiff