-(* Copyright (C) 2004, HELM Team.
+(* Copyright (C) 2003, HELM Team.
*
* This file is part of HELM, an Hypertextual, Electronic
* Library of Mathematics, developed at the Computer Science
List.assoc n subst
with Not_found -> raise (SubstNotFound n)
+(* clean_up_meta take a metasenv and a term and make every local context
+of each occurrence of a metavariable consistent with its canonical context,
+with respect to the hidden hipothesis *)
+(*
+let clean_up_meta subst metasenv t =
+ let module C = Cic in
+ let rec aux t =
+ match t with
+ C.Rel _
+ | C.Sort _ -> t
+ | C.Implicit _ -> assert false
+ | C.Meta (n,l) as t ->
+ let cc =
+ (try
+ let (cc,_) = lookup_subst n subst in cc
+ with SubstNotFound _ ->
+ try
+ let (_,cc,_) = CicUtil.lookup_meta n metasenv in cc
+ with CicUtil.Meta_not_found _ -> assert false) in
+ let l' =
+ (try
+ List.map2
+ (fun t1 t2 ->
+ match t1,t2 with
+ None , _ -> None
+ | _ , t -> t) cc l
+ with
+ Invalid_argument _ -> assert false) in
+ C.Meta (n, l')
+ | C.Cast (te,ty) -> C.Cast (aux te, aux ty)
+ | C.Prod (name,so,dest) -> C.Prod (name, aux so, aux dest)
+ | C.Lambda (name,so,dest) -> C.Lambda (name, aux so, aux dest)
+ | C.LetIn (name,so,dest) -> C.LetIn (name, aux so, aux dest)
+ | C.Appl l -> C.Appl (List.map aux l)
+ | C.Var (uri,exp_named_subst) ->
+ let exp_named_subst' =
+ List.map (fun (uri,t) -> (uri, aux t)) exp_named_subst
+ in
+ C.Var (uri, exp_named_subst')
+ | C.Const (uri, exp_named_subst) ->
+ let exp_named_subst' =
+ List.map (fun (uri,t) -> (uri, aux t)) exp_named_subst
+ in
+ C.Const (uri, exp_named_subst')
+ | C.MutInd (uri,tyno,exp_named_subst) ->
+ let exp_named_subst' =
+ List.map (fun (uri,t) -> (uri, aux t)) exp_named_subst
+ in
+ C.MutInd (uri, tyno, exp_named_subst')
+ | C.MutConstruct (uri,tyno,consno,exp_named_subst) ->
+ let exp_named_subst' =
+ List.map (fun (uri,t) -> (uri, aux t)) exp_named_subst
+ in
+ C.MutConstruct (uri, tyno, consno, exp_named_subst')
+ | C.MutCase (uri,tyno,out,te,pl) ->
+ C.MutCase (uri, tyno, aux out, aux te, List.map aux pl)
+ | C.Fix (i,fl) ->
+ let fl' =
+ List.map
+ (fun (name,j,ty,bo) -> (name, j, aux ty, aux bo)) fl
+ in
+ C.Fix (i, fl')
+ | C.CoFix (i,fl) ->
+ let fl' =
+ List.map
+ (fun (name,ty,bo) -> (name, aux ty, aux bo)) fl
+ in
+ C.CoFix (i, fl')
+ in
+ aux t *)
+
(*** Functions to apply a substitution ***)
let apply_subst_gen ~appl_fun subst term =
(***** Pretty printing functions ******)
-let ppsubst subst =
- String.concat "\n"
- (List.map
- (fun (idx, (_, term)) ->
- Printf.sprintf "?%d := %s" idx (CicPp.ppterm term))
- subst)
-;;
-
let ppterm subst term = CicPp.ppterm (apply_subst subst term)
let ppterm_in_context subst term name_context =
sprintf "%s_ :? _" (separate i), None::name_context
) context ("",[])
+let ppsubst_unfolded subst =
+ String.concat "\n"
+ (List.map
+ (fun (idx, (c, t)) ->
+ let context,name_context = ppcontext' ~sep:"; " subst c in
+ sprintf "%s |- ?%d:= %s" context idx
+ (ppterm_in_context subst t name_context))
+ subst)
+(*
+ Printf.sprintf "?%d := %s" idx (CicPp.ppterm term))
+ subst) *)
+;;
+
+let ppsubst subst =
+ String.concat "\n"
+ (List.map
+ (fun (idx, (c, t)) ->
+ let context,name_context = ppcontext' ~sep:"; " [] c in
+ sprintf "%s |- ?%d:= %s" context idx
+ (ppterm_in_context [] t name_context))
+ subst)
+;;
+
let ppcontext ?sep subst context = fst (ppcontext' ?sep subst context)
let ppmetasenv ?(sep = "\n") metasenv subst =
(* assumption: metasenv is already instantiated wrt subst *)
let type_of_aux' metasenv subst context term =
let time1 = Unix.gettimeofday () in
+(* let term = clean_up_meta subst metasenv term in *)
let term = apply_subst subst term in
let context = apply_subst_context subst context in
(* let metasenv = apply_subst_metasenv subst metasenv in *)
(List.map
(fun i ->
try
- match List.nth context i with
+ match List.nth context (i-1) with
| None -> assert false
| Some (n, _) -> CicPp.ppname n
with
with Occur ->
raise (MetaSubstFailure (sprintf
"Cannot restrict the context of the metavariable ?%d over the hypotheses %s since metavariable's type depends on at least one of them"
- n (names_of_context_indexes context to_be_restricted))))
+ n (names_of_context_indexes context to_be_restricted))))
metasenv ([], [])
in
let (more_to_be_restricted', subst) = (* restrict subst *)
List.fold_right
- (fun (n, (context, term)) (more, subst) ->
+ (fun (n, (context, term)) (more, subst') ->
let to_be_restricted =
List.map snd (List.filter (fun (m, _) -> m = n) to_be_restricted)
in
let more_to_be_restricted', term' =
force_does_not_occur subst restricted term
in
- let subst' = (n, (context', term')) :: subst in
+ let subst' = (n, (context', term')) :: subst' in
let more = more @ more_to_be_restricted @ more_to_be_restricted' in
(more, subst')
with Occur ->
- raise (MetaSubstFailure (sprintf
+ let error_msg = sprintf
"Cannot restrict the context of the metavariable ?%d over the hypotheses %s since ?%d is already instantiated with %s and at least one of the hypotheses occurs in the substituted term"
n (names_of_context_indexes context to_be_restricted) n
- (ppterm subst term)))))
+ (ppterm subst term)
+ in
+ (* DEBUG
+ prerr_endline error_msg;
+ prerr_endline ("metasenv = \n" ^ (ppmetasenv metasenv subst));
+ prerr_endline ("subst = \n" ^ (ppsubst subst));
+ prerr_endline ("context = \n" ^ (ppcontext subst context)); *)
+ raise (MetaSubstFailure error_msg)))
subst ([], [])
in
match more_to_be_restricted @ more_to_be_restricted' with
| l -> restrict subst l metasenv
;;
-(*CSC: maybe we should rename delift in abstract, as I did in my dissertation *)
+(*CSC: maybe we should rename delift in abstract, as I did in my dissertation *)(*Andrea: maybe not*)
+
let delift n subst context metasenv l t =
+(* INVARIANT: we suppose that t is not another occurrence of Meta(n,_),
+ otherwise the occur check does not make sense *)
+(*
+ prerr_endline ("sto deliftando il termine " ^ (CicPp.ppterm t) ^ " rispetto
+ al contesto locale " ^ (CicPp.ppterm (Cic.Meta(0,l))));
+*)
+
let module S = CicSubstitution in
let l =
let (_, canonical_context, _) = CicUtil.lookup_meta n metasenv in
in
C.Var (uri,exp_named_subst')
| C.Meta (i, l1) as t ->
- if i = n then
+ (* see the top level invariant *)
+ if (i = n) then
raise (MetaSubstFailure (sprintf
"Cannot unify the metavariable ?%d with a term that has as subterm %s in which the same metavariable occurs (occur check)"
- i (ppterm subst t)))
+ i (ppterm subst t)))
else
+ begin
(* I do not consider the term associated to ?i in subst since *)
(* in this way I can restrict if something goes wrong. *)
let rec deliftl j =
with
NotInTheList
| MetaSubstFailure _ ->
- to_be_restricted := (i,j)::!to_be_restricted ; None::l1'
+ to_be_restricted := (i,j)::!to_be_restricted ; None::l1'
in
- let l' = deliftl 1 l1 in
- C.Meta(i,l')
+ let l' = deliftl 1 l1 in
+ C.Meta(i,l')
+ end
| C.Sort _ as t -> t
| C.Implicit _ as t -> t
| C.Cast (te,ty) -> C.Cast (deliftaux k te, deliftaux k ty)
(* 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 "\n!!!!!!!!!!! First Order UnificationFailure, but maybe it could have been successful even in a first order setting (no conversion, only alpha convertibility)! Please, implement a better delift function !!!!!!!!!!!!!!!!" ;
+(* debug_print "First Order UnificationFailure during delift" ;
+prerr_endline(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
+ ))); *)
raise (Uncertain (sprintf
"Error trying to abstract %s over [%s]: the algorithm only tried to abstract over bound variables"
(ppterm subst t)
projects / helm.git / blobdiff