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|
(***********************************************************************)
(* *)
(* Active-DVI *)
(* *)
(* Projet Cristal, INRIA Rocquencourt *)
(* *)
(* Copyright 2002 Institut National de Recherche en Informatique et *)
(* en Automatique. All rights reserved. This file is distributed *)
(* under the terms of the GNU Lesser General Public License. *)
(* *)
(* Jun Furuse, Didier Rmy and Pierre Weis. *)
(* Contributions by Roberto Di Cosmo, Didier Le Botlan, *)
(* Xavier Leroy, and Alan Schmitt. *)
(* *)
(* Based on Mldvi by Alexandre Miquel. *)
(***********************************************************************)
(* $Id: table.ml,v 1.5 2003/10/23 13:17:21 weis Exp $ *)
type 'a status =
| Unknown
| Known of 'a
| Error of exn;;
type 'a t = {
table : 'a status array;
build : int -> 'a;
(* extension for japanese characters (id > 255) *)
hash : (int, 'a) Hashtbl.t;
};;
let make f = {
table = Array.make 256 Unknown;
build = f;
hash = Hashtbl.create 1031;
};;
let get tbl n =
if n < 0 || n > 0xFF then begin
try Hashtbl.find tbl.hash n with Not_found ->
let v = tbl.build n in
Hashtbl.add tbl.hash n v;
v
end else
let table = tbl.table in
match table.(n) with
| Known v -> v
| Error e -> raise e
| Unknown ->
try
let v = tbl.build n in
table.(n) <- Known v; v
with e ->
table.(n) <- Error e;
raise e;;
|
