+type ('a, 'b) specs = {
+ pp_term : 'a -> F.formatter -> 'b -> unit;
+ pp_context: F.formatter -> 'a -> unit
+}
+
+let level = ref 0
+
+let loc = ref 0
+
+(* Internal functions *******************************************************)
+
+let std = F.std_formatter
+
+let err = F.err_formatter
+
+let pp_items frm st l items =
+ let pp_item frm = function
+ | Term (c, t) -> F.fprintf frm "@,%a" (st.pp_term c) t
+ | Context c -> F.fprintf frm "%a" st.pp_context c
+ | Warn s -> F.fprintf frm "@,%s" s
+ | String s -> F.fprintf frm "%s " s
+ | Loc -> F.fprintf frm " (line %u)" !loc
+ in
+ let iter map frm l = List.iter (map frm) l in
+ if !level >= l then F.fprintf frm "%a" (iter pp_item) items
+
+(* Interface functions ******************************************************)
+
+let box l =
+ if !level >= l then
+ begin F.fprintf std "@,@[<v 2>%s" " "; F.pp_print_if_newline std () end
+
+let unbox l = if !level >= l then F.fprintf std "@]"
+
+let flush l = if !level >= l then F.fprintf std "@]@."
+
+let box_err () = F.fprintf err "@[<v>"
+
+let flush_err () = F.fprintf err "@]@."
+
+let log st l items = pp_items std st l items
+
+let error st items = pp_items err st 0 items
+
+let items1 s = [Warn s]
+
+let t_items1 st c t =
+ [Warn st; Term (c, t)]
+
+let ct_items1 sc c st t =
+ [Warn sc; Context c; Warn st; Term (c, t)]
+
+let ct_items2 sc c st1 t1 st2 t2 =
+ ct_items1 sc c st1 t1 @ [Warn st2; Term (c, t2)]
+
+let ct_items3 sc c st1 t1 st2 t2 st3 t3 =
+ ct_items2 sc c st1 t1 st2 t2 @ [Warn st3; Term (c, t3)]
+
+let warn msg = F.fprintf std "@,%s" msg