(* $Id$ *)
+let debug = ref false;;
+let indent = ref "";;
+let times = ref [];;
+let pp s =
+ if !debug then
+ prerr_endline (Printf.sprintf "%-20s" !indent ^ " " ^ Lazy.force s)
+;;
+let inside c =
+ if !debug then
+ begin
+ let time1 = Unix.gettimeofday () in
+ indent := !indent ^ String.make 1 c;
+ times := time1 :: !times;
+ prerr_endline ("{{{" ^ !indent ^ " ")
+ end
+;;
+let outside exc_opt =
+ if !debug then
+ begin
+ let time2 = Unix.gettimeofday () in
+ let time1 =
+ match !times with time1::tl -> times := tl; time1 | [] -> assert false in
+ prerr_endline ("}}} " ^ string_of_float (time2 -. time1));
+ (match exc_opt with
+ | Some e -> prerr_endline ("exception raised: " ^ Printexc.to_string e)
+ | None -> ());
+ try
+ indent := String.sub !indent 0 (String.length !indent -1)
+ with
+ Invalid_argument _ -> indent := "??"; ()
+ end
+;;
+
exception MetaSubstFailure of string Lazy.t
exception Uncertain of string Lazy.t
-let newmeta =
+let newmeta,maxmeta =
let maxmeta = ref 0 in
- fun () -> incr maxmeta; !maxmeta
+ (fun () -> incr maxmeta; !maxmeta),
+ (fun () -> !maxmeta)
;;
exception NotInTheList;;
exception Occur;;
+let purge_restricted restrictions more_restrictions l =
+ if more_restrictions = [] then l
+ else
+ begin
+ pp (lazy ("TO BE RESTRICTED: " ^
+ (String.concat "," (List.map string_of_int restrictions))));
+ pp (lazy ("MORE RESTRICTIONS: " ^
+ (String.concat "," (List.map string_of_int more_restrictions))));
+ let shift,lc = l in
+ let lc = NCicUtils.expand_local_context lc in
+ let rec aux n lc =
+ match lc with
+ [] -> []
+ | _ when List.mem n restrictions -> aux (n+1) lc
+ | _::tl when List.mem n more_restrictions -> aux (n+1) tl
+ | he::tl -> he::aux (n+1) tl
+ in
+ pack_lc (shift, NCic.Ctx (aux 1 lc))
+ end
+;;
+
let rec force_does_not_occur metasenv subst restrictions t =
let rec aux k ms = function
| NCic.Rel r when List.mem (r - k) restrictions -> raise Occur
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' =
- 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')
- else
- let metasenv, subst, newmeta =
- restrict metasenv subst n restrictions_for_n
- in
- (metasenv, subst), NCic.Meta (newmeta, l')
+ (try
+ let _,_,bo,_ = NCicUtils.lookup_subst n subst in
+ aux k ms (NCicSubstitution.subst_meta l bo)
+ with
+ NCicUtils.Subst_not_found _ ->
+ (* we ignore the subst since restrict will take care of already
+ * instantiated/restricted metavariabels *)
+ let l = NCicUtils.expand_local_context lc in
+ let sl = List.map (NCicSubstitution.lift shift) l in
+ let (metasenv,subst as ms), _, restrictions_for_n, l' =
+ List.fold_right
+ (fun t (ms, i, restrictions_for_n, l) ->
+ try
+ (*pp (lazy ("L'ORLO DELLA FOSSA: k= " ^ string_of_int k ^ " shift=" ^
+ string_of_int shift ^ " t=" ^ NCicPp.ppterm ~metasenv ~subst ~context:[] t));*)
+ let ms, t = aux k ms t in
+ (*pp (lazy ("LA FOSSA: " ^ NCicPp.ppterm ~metasenv ~subst ~context:[] t));*)
+ ms, i-1, restrictions_for_n, t::l
+ with Occur ->
+ ms, i-1, i::restrictions_for_n, l)
+ sl (ms, List.length l, [], [])
+ in
+ if restrictions_for_n = [] then
+ ms, if sl = l' then orig else (
+ (*pp (lazy ("FINITO: " ^ NCicPp.ppterm ~metasenv:[] ~subst:[]
+ ~context:[] (NCic.Meta (n,pack_lc (0, NCic.Ctx l')))));*)
+ NCic.Meta (n, pack_lc (0, NCic.Ctx l'))
+ )
+ else
+ let l' = pack_lc (0, NCic.Ctx l') in
+ let _ = pp (lazy ("restrictions for n are:" ^ String.concat "," (List.map string_of_int restrictions_for_n))) in
+ let metasenv, subst, newmeta, more_restricted =
+ restrict metasenv subst n restrictions_for_n in
+ let _ = pp (lazy ("more restricted: " ^String.concat "," (List.map string_of_int more_restricted))) in
+ let l' = purge_restricted restrictions more_restricted l' in
+ (metasenv, subst), NCic.Meta (newmeta, l'))
| t -> NCicUntrusted.map_term_fold_a (fun _ k -> k+1) k aux ms t
in
aux 0 (metasenv,subst) t
and force_does_not_occur_in_context metasenv subst restrictions = function
| name, NCic.Decl t as orig ->
+ (* pp (lazy ("CCC: hd is" ^ NCicPp.ppterm ~metasenv:[] ~subst:[] ~context:[] t ^
+ "\nCCC: restrictions are:" ^ String.concat "," (List.map string_of_int restrictions)));*)
let (metasenv, subst), t' =
force_does_not_occur metasenv subst restrictions t in
metasenv, subst, (if t == t' then orig else (name,NCic.Decl t'))
with Occur ->
metasenv, subst, (pos :: restricted), tl'
-and restrict metasenv subst i restrictions =
+and restrict metasenv subst i (restrictions as orig) =
assert (restrictions <> []);
try
let name, ctx, bo, ty = NCicUtils.lookup_subst i subst in
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
+ let diff = List.filter (fun x -> not (List.mem x orig)) restrictions in
+ metasenv, new_subst, j, diff
with Occur -> raise (MetaSubstFailure (lazy (Printf.sprintf
("Cannot restrict the context of the metavariable ?%d over "^^
"the hypotheses %s since ?%d is already instantiated "^^
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
+ (* pp (lazy ("BBB: dopo1 \n" ^ NCicPp.ppsubst ~metasenv [subst_entry]));
+ pp (lazy ("BBB: dopo2 \n" ^ NCicPp.ppsubst ~metasenv (subst_entry::subst)));
+ pp (lazy ("BBB: dopo metasenv\n" ^ NCicPp.ppmetasenv ~subst [metasenv_entry]));*)
+ let diff = List.filter (fun x -> not (List.mem x orig)) restrictions in
List.map
(fun (n,_) as orig -> if i = n then metasenv_entry else orig)
metasenv,
- subst_entry :: subst, j
+ subst_entry :: subst, j, diff
with Occur -> raise (MetaSubstFailure (lazy (Printf.sprintf
("Cannot restrict the context of the metavariable ?%d "^^
"over the hypotheses %s since metavariable's type depends "^^
| NCicUtils.Meta_not_found _ -> assert false
;;
-let rec flexible_arg subst = function
- | NCic.Meta (i,_) | NCic.Appl (NCic.Meta (i,_) :: _)->
+let rec is_flexible context ~subst = function
+ | NCic.Meta (i,_) ->
(try
let _,_,t,_ = List.assoc i subst in
- flexible_arg subst t
+ is_flexible context ~subst t
with Not_found -> true)
+ | NCic.Appl (NCic.Meta (i,_) :: args)->
+ (try
+ let _,_,t,_ = List.assoc i subst in
+ is_flexible context ~subst
+ (NCicReduction.head_beta_reduce ~delta:max_int
+ (NCic.Appl (t :: args)))
+ with Not_found -> true)
+ (* this is a cheap whd, it only performs zeta-reduction.
+ *
+ * it works when the **omissis** disambiguation algorithm
+ * is run on `let x := K a b in t`, K is substituted for a
+ * ? and thus in t metavariables have a flexible Rel
+ *)
+ | NCic.Rel i ->
+ (try
+ match List.nth context (i-1)
+ with
+ | _,NCic.Def (bo,_) ->
+ is_flexible context ~subst
+ (NCicSubstitution.lift i bo)
+ | _ -> false
+ with
+ | Failure _ ->
+ prerr_endline (Printf.sprintf "Rel %d inside context:\n%s" i
+ (NCicPp.ppcontext ~subst ~metasenv:[] context));
+ assert false
+ | Invalid_argument _ -> assert false)
| _ -> false
;;
-let flexible subst l = List.exists (flexible_arg subst) l;;
-
-let in_scope_tag = "tag:in_scope" ;;
-let out_scope_tag_prefix = "tag:out_scope:"
-let out_scope_tag n = out_scope_tag_prefix ^ string_of_int n ;;
-let is_out_scope_tag tag =
- String.length tag > String.length out_scope_tag_prefix &&
- String.sub tag 0 (String.length out_scope_tag_prefix) = out_scope_tag_prefix
-;;
+let is_out_scope = function `OutScope _ -> true | _ -> false;;
+let is_out_scope_tag = List.exists is_out_scope;;
let int_of_out_scope_tag tag =
- int_of_string
- (String.sub tag (String.length out_scope_tag_prefix)
- (String.length tag - (String.length out_scope_tag_prefix)))
+ match List.filter is_out_scope tag with [`OutScope n] -> n | _ -> assert false
;;
+exception Found;;
+
(* INVARIANT: we suppose that t is not another occurrence of Meta(n,_),
otherwise the occur check does not make sense in case of unification
of ?n with ?n *)
let delift ~unify metasenv subst context n l t =
+ (*D*) inside 'D'; try let rc =
+ let is_in_scope_meta subst = function
+ | NCic.Meta (i,_) ->
+ (try
+ let tag, _, _, _ = NCicUtils.lookup_subst i subst in
+ List.mem `InScope tag
+ with NCicUtils.Subst_not_found _ -> false)
+ | _ -> false
+ in
+ let contains_in_scope subst t =
+ let rec aux _ () = function
+ | NCic.Meta _ as t ->
+ if is_in_scope_meta subst t then raise Found
+ else ()
+ | t ->
+ if is_in_scope_meta subst t then raise Found
+ else NCicUtils.fold (fun _ () -> ()) () aux () t
+ in
+ try aux () () t; false with Found -> true
+ in
let unify_list in_scope =
match l with
| _, NCic.Irl _ -> fun _ _ _ _ _ -> None
| shift, NCic.Ctx l -> fun metasenv subst context k t ->
- if flexible_arg subst t then None else
- let lb = List.map (fun t -> t, flexible_arg subst t) l in
+ if is_flexible context ~subst t || contains_in_scope subst t then None else
+ let lb =
+ List.map (fun t ->
+ let t = NCicSubstitution.lift (k+shift) t in
+ t, is_flexible context ~subst t)
+ l
+ in
HExtlib.list_findopt
(fun (li,flexible) i ->
if flexible || i < in_scope then None else
- let li = NCicSubstitution.lift (k+shift) li in
match unify metasenv subst context li t with
| Some (metasenv,subst) ->
Some ((metasenv, subst), NCic.Rel (i+1+k))
| NCic.Rel n as t when n <= k -> ms, t
| NCic.Rel n ->
(try
- match List.nth context (n-k-1) with
+ match List.nth context (n-1) with
| _,NCic.Def (bo,_) ->
(try ms, NCic.Rel ((position in_scope (n-k) l) + k)
with NotInTheList ->
(NCicPp.ppterm ~context ~metasenv ~subst t))))
| NCic.Meta (i,l1) as orig ->
(try
- let tag,_,t,_ = NCicUtils.lookup_subst i subst in
- let in_scope =
- match tag with
- | Some tag when tag = in_scope_tag -> 0
- | Some tag when is_out_scope_tag tag -> int_of_out_scope_tag tag
- | _ -> in_scope
+ let tag,c,t,ty = NCicUtils.lookup_subst i subst in
+ let in_scope, clear =
+ if List.mem `InScope tag then 0, true
+ else if is_out_scope_tag tag then int_of_out_scope_tag tag,true
+ else in_scope, false
+ in
+ let ms =
+ if not clear then ms
+ else
+ metasenv,
+ (i,([],c,t,ty)) :: List.filter (fun j,_ -> i <> j) subst
in
aux (context,k,in_scope) ms (NCicSubstitution.subst_meta l1 t)
with NCicUtils.Subst_not_found _ ->
| NCic.Irl len, NCic.Irl len1
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, (0,NCic.Irl (max 0 (k-shift1))))
+ let metasenv, subst, newmeta, more_restricted =
+ restrict metasenv subst i restrictions in
+ let l' = (0,NCic.Irl (max 0 (k-shift1))) in
+ let l' = purge_restricted restrictions more_restricted l' in
+ (metasenv, subst),NCic.Meta (newmeta,l')
| NCic.Irl len, NCic.Irl len1 ->
let low_restrictions, new_shift =
if k <= shift1 && shift1 < shift then
if shift = k then ms, orig
else ms, NCic.Meta (i, (new_shift, lc1))
else
- 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 metasenv, subst, newmeta, more_restricted =
+ restrict metasenv subst i restrictions in
let newlc_len = len1 - List.length restrictions in
- let meta =
- NCic.Meta(newmeta,(new_shift, NCic.Irl newlc_len))
- in
- assert (
- let _, cctx, _ = NCicUtils.lookup_meta newmeta metasenv in
- List.length cctx = newlc_len);
- (metasenv, subst), meta
+ let l' = new_shift, NCic.Irl newlc_len in
+ let l' = purge_restricted restrictions more_restricted l' in
+ (metasenv, subst),NCic.Meta(newmeta,l')
| _ ->
let lc1 = NCicUtils.expand_local_context lc1 in
| NotInTheList | MetaSubstFailure _ -> ms, j::tbr, tl
in
let (metasenv, subst), to_be_r, lc1' = deliftl [] 1 ms lc1 in
-(*
- prerr_endline ("TO BE RESTRICTED: " ^
- (String.concat "," (List.map string_of_int to_be_r)));
-*)
+ pp (lazy ("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)));
-*)
+ pp (lazy ("newmeta:" ^ NCicPp.ppterm
+ ~metasenv ~subst ~context (NCic.Meta (999,l1))));
+ pp (lazy (NCicPp.ppmetasenv ~subst metasenv));
if to_be_r = [] then
(metasenv, subst),
(if lc1' = lc1 then orig else NCic.Meta (i,l1))
else
- let metasenv, subst, newmeta =
- restrict metasenv subst i to_be_r in
- (metasenv, subst), NCic.Meta(newmeta,l1))
+ let metasenv, subst, newmeta, more_restricted =
+ restrict metasenv subst i to_be_r in
+ let l1 = purge_restricted to_be_r more_restricted l1 in
+ (metasenv, subst), NCic.Meta(newmeta,l1))
| t ->
NCicUntrusted.map_term_fold_a
(fun e (c,k,s) -> (e::c,k+1,s)) (context,k,in_scope) aux ms t
in
+(*
+ prerr_endline (
+ "DELIFTO " ^ NCicPp.ppterm ~metasenv ~subst ~context t ^ " w.r.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))
+ )));
+*)
try aux (context,0,0) (metasenv,subst) t
with NotInTheList ->
(* This is the case where we fail even first order unification. *)
let lc = NCicUtils.expand_local_context lc in
let l = List.map (NCicSubstitution.lift shift) lc in
if
- List.exists
- (fun t ->
- NCicUntrusted.metas_of_term subst context t = [])
- l
+ List.exists (fun t-> NCicUntrusted.metas_of_term subst context t <> [])l
then
raise (Uncertain msg)
else
raise (MetaSubstFailure msg)
+ (*D*) in outside None; rc with exn -> outside (Some exn); raise exn
;;
-let mk_meta ?name metasenv context ty =
- let tyof = function Some s -> Some ("typeof_"^s) | None -> None in
- let rec mk_meta name n metasenv context = function
- | `WithType ty ->
- let len = List.length context in
- let menv_entry = (n, (name, context, ty)) in
- menv_entry :: metasenv, n, NCic.Meta (n, (0,NCic.Irl len)), ty
- | `Sort ->
- let ty = NCic.Implicit (`Typeof n) in
- mk_meta (tyof name) n metasenv [] (`WithType ty)
- | `Type ->
- let metasenv, _, ty, _ =
- mk_meta (tyof name) (newmeta ()) metasenv context `Sort in
- mk_meta name n metasenv context (`WithType ty)
- | `Term ->
- let metasenv, _, ty, _ =
- mk_meta (tyof name) (newmeta ()) metasenv context `Type in
- mk_meta name n metasenv context (`WithType ty)
- in
- mk_meta name (newmeta ()) metasenv context ty
+let mk_meta ?(attrs=[]) metasenv context ?with_type kind =
+ assert(kind <> `IsSort || context = []);
+ let n = newmeta () in
+ let ty= match with_type with None-> NCic.Implicit (`Typeof n)| Some x ->x in
+ let len = List.length context in
+ let attrs = NCicUntrusted.set_kind kind attrs in
+ let menv_entry = (n, (attrs, context, ty)) in
+ menv_entry :: metasenv, n, NCic.Meta (n, (0,NCic.Irl len)), ty
+;;
+
+let extend_meta metasenv n =
+ try
+ let attrs,cc,ty = NCicUtils.lookup_meta n metasenv in
+ (match ty with
+ | NCic.Implicit (`Typeof _) ->
+ let mk_meta context kind =
+ let metasenv, _, ty, _ = mk_meta metasenv context kind in
+ (n, (attrs, cc, ty)) :: List.filter (fun x,_ -> x <> n) metasenv, ty
+ in
+ (match NCicUntrusted.kind_of_meta attrs with
+ | `IsSort
+ | `IsType -> mk_meta [] `IsSort
+ | `IsTerm -> mk_meta cc `IsType)
+ | ty -> metasenv, ty)
+ with NCicUtils.Meta_not_found _ -> assert false
;;
let saturate ?(delta=0) metasenv subst context ty goal_arity =
let rec aux metasenv = function
| NCic.Prod (name,s,t) as ty ->
let metasenv1, _, arg,_ =
- mk_meta ~name:name metasenv context (`WithType s) in
+ mk_meta ~attrs:[`Name name] metasenv context ~with_type:s `IsTerm in
let t, metasenv1, args, pno =
aux metasenv1 (NCicSubstitution.subst arg t)
in
projects / helm.git / blobdiff