in
res @ locate_in_term what ~where:ty context
-(* saturate_term newmeta metasenv context ty goal_arity *)
-(* Given a type [ty] (a backbone), it returns its suffix of length *)
-(* [goal_arity] head and a new metasenv in which there is new a META for each *)
-(* hypothesis, a list of arguments for the new applications and the index of *)
-(* the last new META introduced. The nth argument in the list of arguments is *)
-(* just the nth new META. *)
-let saturate_term newmeta metasenv context ty goal_arity =
- let module C = Cic in
- let module S = CicSubstitution in
- assert (goal_arity >= 0);
- let rec aux newmeta ty =
- match ty with
- C.Cast (he,_) -> aux newmeta he
-(* CSC: patch to generate ?1 : ?2 : Type in place of ?1 : Type to simulate ?1 :< Type
- (* If the expected type is a Type, then also Set is OK ==>
- * we accept any term of type Type *)
- (*CSC: BUG HERE: in this way it is possible for the term of
- * type Type to be different from a Sort!!! *)
- | C.Prod (name,(C.Sort (C.Type _) as s),t) ->
- (* TASSI: ask CSC if BUG HERE refers to the C.Cast or C.Propd case *)
- let irl =
- CicMkImplicit.identity_relocation_list_for_metavariable context
- in
- let newargument = C.Meta (newmeta+1,irl) in
- let (res,newmetasenv,arguments,lastmeta) =
- aux (newmeta + 2) (S.subst newargument t)
- in
- res,
- (newmeta,[],s)::(newmeta+1,context,C.Meta (newmeta,[]))::newmetasenv,
- newargument::arguments,lastmeta
-*)
- | C.Prod (name,s,t) ->
- let irl =
- CicMkImplicit.identity_relocation_list_for_metavariable context
- in
- let newargument = C.Meta (newmeta,irl) in
- let res,newmetasenv,arguments,lastmeta,prod_no =
- aux (newmeta + 1) (S.subst newargument t)
- in
- if prod_no + 1 = goal_arity then
- let head = CicReduction.normalize ~delta:false context ty in
- head,[],[],lastmeta,goal_arity + 1
- else
- (** NORMALIZE RATIONALE
- * we normalize the target only NOW since we may be in this case:
- * A1 -> A2 -> T where T = (\lambda x.A3 -> P) k
- * and we want a mesasenv with ?1:A1 and ?2:A2 and not
- * ?1, ?2, ?3 (that is the one we whould get if we start from the
- * beta-normalized A1 -> A2 -> A3 -> P **)
- let s' = CicReduction.normalize ~delta:false context s in
- res,(newmeta,context,s')::newmetasenv,newargument::arguments,
- lastmeta,prod_no + 1
- | t ->
- let head = CicReduction.normalize ~delta:false context t in
- match CicReduction.whd context head with
- C.Prod _ as head' -> aux newmeta head'
- | _ -> head,[],[],newmeta,0
- in
- (* WARNING: here we are using the invariant that above the most *)
- (* recente new_meta() there are no used metas. *)
- let res,newmetasenv,arguments,lastmeta,_ = aux newmeta ty in
- res,metasenv @ newmetasenv,arguments,lastmeta
-
let lookup_type metasenv context hyp =
let rec aux p = function
| Some (Cic.Name name, Cic.Decl t) :: _ when name = hyp -> p, t
(* FG: **********************************************************************)
-let list_rev_map_filter f l =
- let rec aux a = function
- | [] -> a
- | hd :: tl ->
- begin match f hd with
- | None -> aux a tl
- | Some b -> aux (b :: a) tl
- end
- in
- aux [] l
-
let get_name context index =
try match List.nth context (pred index) with
| Some (Cic.Name name, _) -> Some name
| _ -> None
with Invalid_argument "List.nth" -> None
+
+let get_rel context name =
+ let rec aux i = function
+ | [] -> None
+ | Some (Cic.Name s, _) :: _ when s = name -> Some (Cic.Rel i)
+ | _ :: tl -> aux (succ i) tl
+ in
+ aux 1 context