snapshot

[helm.git] / helm / ocaml / cic_notation / cicNotationUtil.ml

diff --git a/helm/ocaml/cic_notation/cicNotationUtil.ml b/helm/ocaml/cic_notation/cicNotationUtil.ml
index 271b0df2155dee1cab6b98b0d79178b06752b9b1..18e04640a48658bc0ab970dedebe94ec7e0f54b3 100644 (file)
--- a/helm/ocaml/cic_notation/cicNotationUtil.ml
+++ b/helm/ocaml/cic_notation/cicNotationUtil.ml
@@ -32,6 +32,72 @@ let fresh_name =
     incr index;
     "fresh" ^ string_of_int !index
 
+(* let meta_names_of term = *)
+(*   let rec names = ref [] in *)
+(*   let add_name n = *)
+(*     if List.mem n !names then () *)
+(*     else names := n :: !names *)
+(*   in *)
+(*   let rec aux = function *)
+(*     | AttributedTerm (_, term) -> aux term *)
+(*     | Appl terms -> List.iter aux terms *)
+(*     | Binder (_, _, body) -> aux body *)
+(*     | Case (term, indty, outty_opt, patterns) -> *)
+(*         aux term ; *)
+(*         aux_opt outty_opt ; *)
+(*         List.iter aux_branch patterns *)
+(*     | LetIn (_, t1, t2) -> *)
+(*         aux t1 ; *)
+(*         aux t2 *)
+(*     | LetRec (_, definitions, body) -> *)
+(*         List.iter aux_definition definitions ; *)
+(*         aux body *)
+(*     | Uri (_, Some substs) -> aux_substs substs *)
+(*     | Ident (_, Some substs) -> aux_substs substs *)
+(*     | Meta (_, substs) -> aux_meta_substs substs *)
+
+(*     | Implicit *)
+(*     | Ident _ *)
+(*     | Num _ *)
+(*     | Sort _ *)
+(*     | Symbol _ *)
+(*     | Uri _ *)
+(*     | UserInput -> () *)
+
+(*     | Magic magic -> aux_magic magic *)
+(*     | Variable var -> aux_variable var *)
+
+(*     | _ -> assert false *)
+(*   and aux_opt = function *)
+(*     | Some term -> aux term *)
+(*     | None -> () *)
+(*   and aux_capture_var (_, ty_opt) = aux_opt ty_opt *)
+(*   and aux_branch (pattern, term) = *)
+(*     aux_pattern pattern ; *)
+(*     aux term *)
+(*   and aux_pattern (head, vars) =  *)
+(*     List.iter aux_capture_var vars *)
+(*   and aux_definition (var, term, i) = *)
+(*     aux_capture_var var ; *)
+(*     aux term *)
+(*   and aux_substs substs = List.iter (fun (_, term) -> aux term) substs *)
+(*   and aux_meta_substs meta_substs = List.iter aux_opt meta_substs *)
+(*   and aux_variable = function *)
+(*     | NumVar name -> add_name name *)
+(*     | IdentVar name -> add_name name *)
+(*     | TermVar name -> add_name name *)
+(*     | FreshVar _ -> () *)
+(*     | Ascription _ -> assert false *)
+(*   and aux_magic = function *)
+(*     | Default (t1, t2) *)
+(*     | Fold (_, t1, _, t2) -> *)
+(*         aux t1 ; *)
+(*         aux t2 *)
+(*     | _ -> assert false *)
+(*   in *)
+(*   aux term ; *)
+(*   !names *)
+
 let visit_ast ?(special_k = fun _ -> assert false) k =
   let rec aux = function
 
@@ -105,8 +171,41 @@ let visit_magic k = function
   | Fold (kind, t1, names, t2) -> Fold (kind, k t1, names, k t2)
   | Default (t1, t2) -> Default (k t1, k t2)
 
+let variables_of_term t =
+  let rec vars = ref [] in
+  let add_variable v =
+    if List.mem v !vars then ()
+    else vars := v :: !vars
+  in
+  let rec aux = function
+    | Magic m -> Magic (visit_magic aux m)
+    | Layout l -> Layout (visit_layout aux l)
+    | Variable v -> Variable (aux_variable v)
+    | Literal _ as t -> t
+    | AttributedTerm (_, t) -> aux t
+    | t -> visit_ast aux t
+  and aux_variable = function
+    | (NumVar _
+      | IdentVar _
+      | TermVar _) as t ->
+       add_variable t ;
+       t
+    | FreshVar _ as t -> t
+    | Ascription _ -> assert false
+  in
+    ignore (aux t) ;
+    !vars
+
+let names_of_term t =
+  let aux = function
+    | NumVar s
+    | IdentVar s
+    | TermVar s -> s
+    | _ -> assert false
+  in
+    List.map aux (variables_of_term t)
+
 let rec strip_attributes t =
-  prerr_endline "strip_attributes";
   let special_k = function
     | AttributedTerm (_, term) -> strip_attributes term
     | Magic m -> Magic (visit_magic strip_attributes m)