1 files changed, 53 insertions, 0 deletions
diff --git a/printing/genprint.ml b/printing/genprint.ml
new file mode 100644
index 0000000000..5a1da2fd7d
--- /dev/null
+++ b/printing/genprint.ml
@@ -0,0 +1,53 @@
+(************************************************************************)
+(*  v      *   The Coq Proof Assistant  /  The Coq Development Team     *)
+(* <O___,, *   INRIA - CNRS - LIX - LRI - PPS - Copyright 1999-2012     *)
+(*   \VV/  **************************************************************)
+(*    //   *      This file is distributed under the terms of the       *)
+(*         *       GNU Lesser General Public License Version 2.1        *)
+(************************************************************************)
+
+open Pp
+open Util
+open Genarg
+
+type printer = {
+  raw : Obj.t -> std_ppcmds;
+  glb : Obj.t -> std_ppcmds;
+  top : Obj.t -> std_ppcmds;
+}
+
+let default_printer name = (); fun _ -> str "<genarg:" ++ str name ++ str ">"
+
+let default_printer name =
+  let pr = default_printer name in
+  { raw = pr; glb = pr; top = pr; }
+
+let (arg0_printer_map : printer String.Map.t ref) = ref String.Map.empty
+
+let get_printer0 name =
+  try String.Map.find name !arg0_printer_map
+  with Not_found -> default_printer name
+
+let obj_printer t = match t with
+| ExtraArgType s -> get_printer0 s
+| _ -> assert false
+
+let raw_print arg = Obj.magic (obj_printer (unquote (rawwit arg))).raw
+let glb_print arg = Obj.magic (obj_printer (unquote (rawwit arg))).glb
+let top_print arg = Obj.magic (obj_printer (unquote (rawwit arg))).top
+
+let generic_raw_print v =
+  (obj_printer (genarg_tag v)).raw (Unsafe.prj v)
+let generic_glb_print v =
+  (obj_printer (genarg_tag v)).glb (Unsafe.prj v)
+let generic_top_print v =
+  (obj_printer (genarg_tag v)).top (Unsafe.prj v)
+
+let register_print0 arg rpr gpr tpr = match unquote (rawwit arg) with
+| ExtraArgType s ->
+  if String.Map.mem s !arg0_printer_map then
+    Errors.anomaly (str "interp0 function already registered: " ++ str s)
+  else
+    let pr = { raw = Obj.magic rpr; glb = Obj.magic gpr; top = Obj.magic tpr; } in
+    arg0_printer_map := String.Map.add s pr !arg0_printer_map
+| _ -> assert false