+(* Copyright (C) 2006, HELM Team.
+ *
+ * This file is part of HELM, an Hypertextual, Electronic
+ * Library of Mathematics, developed at the Computer Science
+ * Department, University of Bologna, Italy.
+ *
+ * HELM is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * HELM is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with HELM; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+ * MA 02111-1307, USA.
+ *
+ * For details, see the HELM World-Wide-Web page,
+ * http://helm.cs.unibo.it/
+ *)
+
+(* $Id$ *)
+
+type attribute = string * string (* <key, value> pair *)
+
+module type GraphvizFormatter =
+ sig
+ val header: ?name:string -> Format.formatter -> unit
+ val node: string -> ?attrs:(attribute list) -> Format.formatter -> unit
+ val edge:
+ string -> string -> ?attrs:(attribute list) -> Format.formatter ->
+ unit
+ val raw: string -> Format.formatter -> unit
+ val trailer: Format.formatter -> unit
+ end
+
+open Format
+
+module Dot =
+ struct
+ let attribute fmt (k, v) = fprintf fmt "@[<hv2>%s=@,\"%s\",@]" k v
+ let attributes attrs fmt = List.iter (attribute fmt) attrs
+
+ let header ?(name = "g") fmt = fprintf fmt "@[<hv2>digraph %s {@," name
+ let node name ?(attrs = []) fmt =
+ fprintf fmt "@[<hov2>%s@ [" name;
+ attributes attrs fmt;
+ fprintf fmt "];@]@,"
+ let edge name1 name2 ?(attrs = []) fmt =
+ fprintf fmt "@[<hov2>%s ->@ %s@ [" name1 name2;
+ attributes attrs fmt;
+ fprintf fmt "];@]@,"
+ let raw s fmt = pp_print_string fmt s
+ let trailer fmt = fprintf fmt "@,}@]%!"
+ end
+