snapshot Wed, 27 Nov 2002 18:10:57 +0100

[helm.git] / helm / uwobo / src / ocaml / uwobo_styles.ml

diff --git a/helm/uwobo/src/ocaml/uwobo_styles.ml b/helm/uwobo/src/ocaml/uwobo_styles.ml
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+
+(* Copyright (C) 2002, 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://cs.unibo.it/helm/.
+ *)
+
+open Printf;;
+
+exception Stylesheet_not_found of string;;
+exception Stylesheet_already_in of string;;
+
+class styles =
+  object (self)
+    (* INVARIANT: 'stylesheets' and 'uris' are in sync *)
+
+    inherit Uwobo_common.threadSafe
+
+    val mutable stylesheets = []
+    val mutable uris = []
+    val domImpl = Gdome.domImplementation ()
+
+      (** process an XSLT stylesheet *)
+    method private process uri =
+      Gdome_xslt.processStylesheet (domImpl#createDocumentFromURI ~uri ())
+
+    method get keys =
+      self#doReader (lazy (
+        List.fold_left
+          (fun collected_styles key ->
+            (List.find (fun (k, _) -> k = key) stylesheets)::collected_styles)
+          []
+          (List.rev keys)
+      ))
+
+    method add key uri =
+      self#doWriter (lazy (
+        if (List.mem_assoc key uris) then
+          raise (Stylesheet_already_in key)
+        else begin
+          uris <- (key, uri) :: uris;
+          stylesheets <- (key, self#process uri) :: stylesheets
+        end
+      ))
+
+    method remove key =
+      self#doWriter (lazy (
+        if not (List.mem_assoc key uris) then
+          raise (Stylesheet_not_found key)
+        else begin
+          uris <- List.remove_assoc key uris;
+          stylesheets <- List.remove_assoc key stylesheets
+        end
+      ))
+
+    method removeAll =
+      self#doWriter (lazy (
+        uris <- [];
+        stylesheets <- []
+      ))
+
+    method list =
+      let uris = self#doReader (lazy (
+        uris
+      ))
+      in
+      List.map
+        (fun (key, uri) -> sprintf "key = %s, uri = %s" key (List.assoc key uris))
+        uris
+
+    method reload key =
+      self#doWriter (lazy (
+        (try
+          let uri = List.assoc key uris in
+          stylesheets <-
+            (key, self#process uri) :: (List.remove_assoc key stylesheets)
+        with Not_found ->
+          raise (Stylesheet_not_found key))
+      ))
+
+    method reloadAll =
+      self#doWriter (lazy (
+        stylesheets <- List.map (fun (key, uri) -> (key, self#process uri)) uris
+      ))
+
+  end
+