* http://helm.cs.unibo.it/
*)
+open CicNotationPt
+
(* TODO ensure that names generated by fresh_var do not clash with user's *)
let fresh_name =
let index = ref ~-1 in
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
+
+ | Appl terms -> Appl (List.map k terms)
+ | Binder (kind, var, body) ->
+ Binder (kind, aux_capture_variable var, k body)
+ | Case (term, indtype, typ, patterns) ->
+ Case (k term, indtype, aux_opt typ, aux_patterns patterns)
+ | LetIn (var, t1, t2) -> LetIn (aux_capture_variable var, k t1, k t2)
+ | LetRec (kind, definitions, term) ->
+ let definitions =
+ List.map
+ (fun (var, ty, n) -> aux_capture_variable var, k ty, n)
+ definitions
+ in
+ LetRec (kind, definitions, k term)
+ | Ident (name, Some substs) -> Ident (name, Some (aux_substs substs))
+ | Uri (name, Some substs) -> Uri (name, Some (aux_substs substs))
+ | Meta (index, substs) -> Meta (index, List.map aux_opt substs)
+
+ | (AttributedTerm _
+ | Layout _
+ | Literal _
+ | Magic _
+ | Variable _) as t -> special_k t
+
+ | (Ident _
+ | Implicit
+ | Num _
+ | Sort _
+ | Symbol _
+ | Uri _
+ | UserInput) as t -> t
+
+ and aux_opt = function
+ | None -> None
+ | Some term -> Some (k term)
+
+ and aux_capture_variable (term, typ_opt) = k term, aux_opt typ_opt
+
+ and aux_patterns patterns = List.map aux_pattern patterns
+
+ and aux_pattern ((head, vars), term) =
+ ((head, List.map aux_capture_variable vars), k term)
+
+ and aux_subst (name, term) = (name, k term)
+
+ and aux_substs substs = List.map aux_subst substs
+
+ in
+
+ aux
+
+let visit_layout k = function
+ | Sub (t1, t2) -> Sub (k t1, k t2)
+ | Sup (t1, t2) -> Sup (k t1, k t2)
+ | Below (t1, t2) -> Below (k t1, k t2)
+ | Above (t1, t2) -> Above (k t1, k t2)
+ | Over (t1, t2) -> Over (k t1, k t2)
+ | Atop (t1, t2) -> Atop (k t1, k t2)
+ | Frac (t1, t2) -> Frac (k t1, k t2)
+ | Sqrt t -> Sqrt (k t)
+ | Root (arg, index) -> Root (k arg, k index)
+ | Break -> Break
+ | Box (kind, terms) -> Box (kind, List.map k terms)
+
+let visit_magic k = function
+ | List0 (t, l) -> List0 (k t, l)
+ | List1 (t, l) -> List1 (k t, l )
+ | Opt t -> Opt (k t)
+ | 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 =
+ let special_k = function
+ | AttributedTerm (_, term) -> strip_attributes term
+ | Magic m -> Magic (visit_magic strip_attributes m)
+ | Variable _ as t -> t
+ | t -> assert false
+ in
+ visit_ast ~special_k strip_attributes t
+