let position n (shift, lc) =
match lc with
| NCic.Irl len when n <= shift || n > shift + len -> raise NotInTheList
- | NCic.Irl len -> n - shift
+ | NCic.Irl _ -> n - shift
| NCic.Ctx tl ->
let rec aux k = function
| [] -> raise NotInTheList
| _ -> orig
;;
-let mk_restricted_irl shift len restrictions =
+
+
+let mk_perforated_irl shift len restrictions =
let rec aux n =
if n = 0 then [] else
- if List.mem (n+shift) restrictions then aux (n-1)
- else (NCic.Rel n)::aux (n-1)
+ if List.mem (n+shift) restrictions then aux (n-1)
+ else (NCic.Rel n) :: aux (n-1)
in
pack_lc (shift, NCic.Ctx (List.rev (aux len)))
;;
exception Occur;;
let rec force_does_not_occur metasenv subst restrictions t =
- let rec aux k (metasenv, subst as ms) = function
+ let rec aux k ms = function
| NCic.Rel r when List.mem (r - k) restrictions -> raise Occur
- | NCic.Meta (n, l) as orig ->
+ | NCic.Rel r as orig ->
+ let amount =
+ List.length (List.filter (fun x -> x < r - k) restrictions)
+ in
+ if amount > 0 then ms, NCic.Rel (r - amount) else ms, orig
+ | NCic.Meta (n, (shift,lc as l)) as orig ->
(* we ignore the subst since restrict will take care of already
* instantiated/restricted metavariabels *)
let (metasenv,subst as ms), restrictions_for_n, l' =
- match l with
- | shift, NCic.Irl len ->
- let restrictions =
- List.filter
- (fun i -> i > shift && i <= shift + len) restrictions in
- ms, restrictions, mk_restricted_irl shift len restrictions
- | shift, NCic.Ctx l ->
- let ms, _, restrictions_for_n, l =
- List.fold_right
- (fun t (ms, i, restrictions_for_n, l) ->
- try
- let ms, t = aux (k-shift) ms t in
- ms, i-1, restrictions_for_n, t::l
- with Occur ->
- ms, i-1, i::restrictions_for_n, l)
- l (ms, List.length l, [], [])
- in
- ms, restrictions_for_n, pack_lc (shift, NCic.Ctx l)
+ let l = NCicUtils.expand_local_context lc in
+ let ms, _, restrictions_for_n, l =
+ List.fold_right
+ (fun t (ms, i, restrictions_for_n, l) ->
+ try
+ let ms, t = aux (k-shift) ms t in
+ ms, i-1, restrictions_for_n, t::l
+ with Occur ->
+ ms, i-1, i::restrictions_for_n, l)
+ l (ms, List.length l, [], [])
+ in
+ ms, restrictions_for_n, pack_lc (shift, NCic.Ctx l)
in
if restrictions_for_n = [] then
ms, if l = l' then orig else NCic.Meta (n, l')
restrict metasenv subst n restrictions_for_n
in
(metasenv, subst), NCic.Meta (newmeta, l')
- | t -> NCicUtils.map_term_fold_a (fun _ k -> k+1) k aux ms t
+ | t -> NCicUntrusted.map_term_fold_a (fun _ k -> k+1) k aux ms t
in
aux 0 (metasenv,subst) t
let (metasenv, subst), newbo =
force_does_not_occur metasenv subst restrictions bo in
let j = newmeta () in
- let subst_entry_j = j, (name, newctx, newty, newbo) in
- let reloc_irl = mk_restricted_irl 0 (List.length ctx) restrictions in
+ let subst_entry_j = j, (name, newctx, newbo, newty) in
+ let reloc_irl = mk_perforated_irl 0 (List.length ctx) restrictions in
let subst_entry_i = i, (name, ctx, NCic.Meta (j, reloc_irl), ty) in
- metasenv,
- subst_entry_j :: List.map
- (fun (n,x) as orig -> if i = n then subst_entry_i else orig) subst,
- j
+ let new_subst =
+ subst_entry_j :: List.map
+ (fun (n,_) as orig -> if i = n then subst_entry_i else orig) subst
+ in
+(*
+ prerr_endline ("restringo nella subst: " ^string_of_int i ^ " -> " ^
+ string_of_int j ^ "\n" ^
+ NCicPp.ppsubst ~metasenv [subst_entry_j] ^ "\n\n" ^
+ NCicPp.ppsubst ~metasenv [subst_entry_i] ^ "\n" ^
+ NCicPp.ppterm ~metasenv ~subst ~context:ctx bo ^ " ---- " ^
+ NCicPp.ppterm ~metasenv ~subst ~context:newctx newbo
+ );
+*)
+ metasenv, new_subst, j
with Occur -> raise (MetaSubstFailure (lazy (Printf.sprintf
("Cannot restrict the context of the metavariable ?%d over "^^
"the hypotheses %s since ?%d is already instantiated "^^
force_does_not_occur metasenv subst restrictions ty in
let j = newmeta () in
let metasenv_entry = j, (name, newctx, newty) in
- let reloc_irl = mk_restricted_irl 0 (List.length ctx) restrictions in
+ let reloc_irl =
+ mk_perforated_irl 0 (List.length ctx) restrictions in
let subst_entry = i, (name, ctx, NCic.Meta (j, reloc_irl), ty) in
List.map
- (fun (n,x) as orig -> if i = n then metasenv_entry else orig)
+ (fun (n,_) as orig -> if i = n then metasenv_entry else orig)
metasenv,
subst_entry :: subst, j
with Occur -> raise (MetaSubstFailure (lazy (Printf.sprintf
aux k ms (NCicSubstitution.lift n bo))
| _,NCic.Decl _ -> ms, NCic.Rel ((position (n-k) l) + k)
with Failure _ -> assert false) (*Unbound variable found in delift*)
+ | NCic.Meta (_,(_,(NCic.Irl 0| NCic.Ctx []))) as orig -> ms, orig
| NCic.Meta (i,l1) as orig ->
(try
let _,_,t,_ = NCicUtils.lookup_subst i subst in
else
let shift1,lc1 = l1 in
let shift,lc = l in
+ let shift = shift + k in
match lc, lc1 with
| NCic.Irl len, NCic.Irl len1
- when shift1 < shift || len1 + shift1 > len + shift ->
- let restrictions =
- HExtlib.list_seq 1 (shift - shift1) @
- HExtlib.list_seq (shift+len+1) (shift1+len1)
- in
+ when shift1 + len1 < shift || shift1 > shift + len ->
+ let restrictions = HExtlib.list_seq 1 (len1 + 1) in
let metasenv, subst, newmeta =
restrict metasenv subst i restrictions
in
(metasenv, subst),
- NCic.Meta(newmeta, mk_restricted_irl shift1 len1 restrictions)
- | NCic.Irl len, NCic.Irl len1 when shift = 0 -> ms, orig
- | NCic.Irl len, NCic.Irl len1 ->
- ms, NCic.Meta (i, (shift1 - shift, lc1))
- | _ ->
- let to_be_restricted = ref [] in
+ NCic.Meta (newmeta, (0,NCic.Irl (max 0 (k-shift1))))
+ | NCic.Irl len, NCic.Irl len1
+ when shift1 < shift || len1 + shift1 > len + shift ->
+ (* C. Hoare. Premature optimization is the root of all evil*)
+ let stop = shift + len in
+ let stop1 = shift1 + len1 in
+ let low_gap = max 0 (shift - shift1) in
+ let high_gap = max 0 (stop1 - stop) in
+ let restrictions =
+ HExtlib.list_seq (k+1-shift1) (low_gap + 1) @
+ HExtlib.list_seq (len1 - high_gap + 1) (len1 + 1)
+ in
+ let metasenv, subst, newmeta =
+ restrict metasenv subst i restrictions
+ in
+(*
+ prerr_endline ("RESTRICTIONS FOR: " ^
+ NCicPp.ppterm ~metasenv ~subst ~context:[]
+ (NCic.Meta (i,l1))^" that was part of a term unified with "
+ ^ NCicPp.ppterm ~metasenv ~subst ~context:[] (NCic.Meta
+ (n,l)) ^ " ====> " ^ String.concat "," (List.map
+ string_of_int restrictions) ^ "\nMENV:\n" ^
+ NCicPp.ppmetasenv ~subst metasenv ^ "\nSUBST:\n" ^
+ NCicPp.ppsubst subst ~metasenv);
+*)
+ let newlc_len =
+ len1 - low_gap - high_gap + max 0 (k - shift1) in
+ assert (if shift1 > k then
+ shift1 + low_gap - shift = 0 else true);
+ let meta =
+ NCic.Meta(newmeta,(shift1 + low_gap - shift,
+ NCic.Irl newlc_len))
+ in
+ let _, cctx, _ = NCicUtils.lookup_meta newmeta metasenv in
+ assert (List.length cctx = newlc_len);
+ (metasenv, subst), meta
+
+ | NCic.Irl _, NCic.Irl _ when shift = 0 -> ms, orig
+ | NCic.Irl _, NCic.Irl _ ->
+ ms, NCic.Meta (i, (max 0 (shift1 - shift), lc1))
+ | _ ->
let lc1 = NCicUtils.expand_local_context lc1 in
+ let lc1 = List.map (NCicSubstitution.lift shift1) lc1 in
let rec deliftl tbr j ms = function
| [] -> ms, tbr, []
| t::tl ->
let ms, tbr, tl = deliftl tbr (j+1) ms tl in
try
- let ms, t = aux (k-shift1) ms t in
+ let ms, t = aux k ms t in
ms, tbr, t::tl
with
| NotInTheList | MetaSubstFailure _ -> ms, j::tbr, tl
in
let (metasenv, subst), to_be_r, lc1' = deliftl [] 1 ms lc1 in
- let l1 = pack_lc (shift, NCic.Ctx lc1') in
+(*
+ prerr_endline ("TO BE RESTRICTED: " ^
+ (String.concat "," (List.map string_of_int to_be_r)));
+*)
+ let l1 = pack_lc (0, NCic.Ctx lc1') in
+(*
+ prerr_endline ("newmeta:" ^ NCicPp.ppterm
+ ~metasenv ~subst ~context (NCic.Meta (999,l1)));
+*)
if to_be_r = [] then
(metasenv, subst),
(if lc1' = lc1 then orig else NCic.Meta (i,l1))
let metasenv, subst, newmeta =
restrict metasenv subst i to_be_r in
(metasenv, subst), NCic.Meta(newmeta,l1))
- | t -> NCicUtils.map_term_fold_a (fun _ k -> k+1) k aux ms t
- in
- aux 0 (metasenv,subst) t
-;;
-(*
+ | t -> NCicUntrusted.map_term_fold_a (fun _ k -> k+1) k aux ms t
in
- let res =
- try
- deliftaux 0 t
- with
- NotInTheList ->
+ try aux 0 (metasenv,subst) t
+ with NotInTheList ->
(* This is the case where we fail even first order unification. *)
(* The reason is that our delift function is weaker than first *)
(* order (in the sense of alpha-conversion). See comment above *)
(* related to the delift function. *)
-(* debug_print (lazy "First Order UnificationFailure during delift") ;
-debug_print(lazy (sprintf
- "Error trying to abstract %s over [%s]: the algorithm only tried to abstract over bound variables"
- (ppterm subst t)
- (String.concat "; "
- (List.map
- (function Some t -> ppterm subst t | None -> "_") l
- )))); *)
- let msg = (lazy (sprintf
- "Error trying to abstract %s over [%s]: the algorithm only tried to abstract over bound variables"
- (ppterm ~metasenv subst t)
- (String.concat "; "
- (List.map
- (function Some t -> ppterm ~metasenv subst t | None -> "_")
- l))))
+ let msg = (lazy (Printf.sprintf
+ ("Error trying to abstract %s over [%s]: the algorithm only tried to "^^
+ "abstract over bound variables") (NCicPp.ppterm ~metasenv ~subst
+ ~context t) (String.concat "; " (List.map (NCicPp.ppterm ~metasenv
+ ~subst ~context) (let shift, lc = l in List.map (NCicSubstitution.lift
+ shift) (NCicUtils.expand_local_context lc))))))
in
+ let shift, lc = l in
+ let lc = NCicUtils.expand_local_context lc in
+ let l = List.map (NCicSubstitution.lift shift) lc in
if
List.exists
- (function
- Some t -> CicUtil.is_meta_closed (apply_subst subst t)
- | None -> true) l
+ (fun t -> NCicUntrusted.metas_of_term subst context t = [])
+ l
then
raise (Uncertain msg)
else
raise (MetaSubstFailure msg)
- in
- let (metasenv, subst) = restrict subst !to_be_restricted metasenv in
- res, metasenv, subst
;;
-*)
(*
(* delifts a term t of n levels strating from k, that is changes (Rel m)
delift_rels_from subst metasenv 1 n t
*)
+let mk_meta ?name metasenv context ty =
+ match ty with
+ | `Typeless ->
+ let n = newmeta () in
+ let ty = NCic.Implicit (`Typeof n) in
+ let menv_entry = (n, (name, context, ty)) in
+ menv_entry :: metasenv,NCic.Meta (n, (0,NCic.Irl (List.length context))), ty
+ | `Type
+ | `Term ->
+ let context_for_ty = if ty = `Type then [] else context in
+ let n = newmeta () in
+ let ty_menv_entry = (n, (name,context_for_ty, NCic.Implicit (`Typeof n))) in
+ let m = newmeta () in
+ let ty = NCic.Meta (n, (0,NCic.Irl (List.length context_for_ty))) in
+ let menv_entry = (m, (name, context, ty)) in
+ menv_entry :: ty_menv_entry :: metasenv,
+ NCic.Meta (m, (0,NCic.Irl (List.length context))), ty
+ | `WithType ty ->
+ let n = newmeta () in
+ let len = List.length context in
+ let menv_entry = (n, (name, context, ty)) in
+ menv_entry :: metasenv, NCic.Meta (n, (0,NCic.Irl len)), ty
+;;
+
+let saturate ?(delta=0) metasenv context ty goal_arity =
+ assert (goal_arity >= 0);
+ let rec aux metasenv = function
+ | NCic.Prod (name,s,t) ->
+ let metasenv1, arg,_ =
+ mk_meta ~name:name metasenv context (`WithType s) in
+ let t, metasenv1, args, pno =
+ aux metasenv1 (NCicSubstitution.subst arg t)
+ in
+ if pno + 1 = goal_arity then
+ ty, metasenv, [], goal_arity+1
+ else
+ t, metasenv1, arg::args, pno+1
+ | ty ->
+ match NCicReduction.whd context ty ~delta with
+ | NCic.Prod _ as ty -> aux metasenv ty
+ | ty -> ty, metasenv, [], 0
+ in
+ let res, newmetasenv, arguments, _ = aux metasenv ty in
+ res, newmetasenv, arguments
+;;
projects / helm.git / blobdiff