3 * Stefano Zacchiroli <zack@cs.unibo.it>
4 * for the HELM Team http://helm.cs.unibo.it/
6 * This file is part of HELM, an Hypertextual, Electronic
7 * Library of Mathematics, developed at the Computer Science
8 * Department, University of Bologna, Italy.
10 * HELM is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version 2
13 * of the License, or (at your option) any later version.
15 * HELM is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with HELM; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston,
25 * For details, see the HELM World-Wide-Web page,
26 * http://helm.cs.unibo.it/
31 exception Stylesheet_not_found of string ;;
32 exception Stylesheet_already_in of string ;;
35 | LibXsltErrorMsg of string
36 | LibXsltDebugMsg of string
38 type log = xslt_msg list ;;
42 (* INVARIANT: 'stylesheets' and 'uris' are in sync *)
45 Gdome_xslt.setErrorCallback
46 (Some (fun msg -> self#appendMsg (LibXsltErrorMsg msg)));
47 Gdome_xslt.setDebugCallback
48 (Some (fun msg -> self#appendMsg (LibXsltDebugMsg msg)))
51 val mutable stylesheets = [] (** association list: key -> Gdome.document *)
52 val mutable uris = [] (** association list: key -> uri *)
53 val mutable libXsltMsgs = [] (** libxslt's error and debugging messages *)
55 val domImpl = Gdome.domImplementation ()
57 (** process an XSLT stylesheet *)
58 method private process uri =
59 let dom = domImpl#createDocumentFromURI ~uri () in
60 ignore (Gdome_xslt.processStylesheet dom); (* fills libXsltMsgs in case
64 (* libxslt's error and debugging messages handling *)
66 method private appendMsg msg = libXsltMsgs <- msg :: libXsltMsgs
67 method private clearMsgs = libXsltMsgs <- []
69 (* stylesheets management *)
72 if (List.mem_assoc key uris) then
73 raise (Stylesheet_already_in key)
76 uris <- (key, uri) :: uris;
77 stylesheets <- (key, self#process uri) :: stylesheets;
81 method remove key : log =
82 if not (List.mem_assoc key uris) then
83 raise (Stylesheet_not_found key)
85 uris <- List.remove_assoc key uris;
86 stylesheets <- List.remove_assoc key stylesheets;
87 [] (* no XSLT action -> no logs *)
90 method removeAll : log =
93 [] (* no XSLT action -> no logs *)
98 let uri = List.assoc key uris in
100 (key, self#process uri) :: (List.remove_assoc key stylesheets);
103 raise (Stylesheet_not_found key))
107 stylesheets <- List.map (fun (key, uri) -> (key, self#process uri)) uris;
110 (* stylesheets usage *)
115 sprintf "key = %s, uri = %s" key (List.assoc key uris))
119 let rev_keys = List.rev keys in
120 let last_key = List.hd rev_keys in
123 (fun collected_styles key ->
124 let (key, stylesheet) =
126 List.find (fun (k, _) -> k = key) stylesheets
127 with Not_found -> raise (Stylesheet_not_found key)
129 (key, Gdome_xslt.processStylesheet stylesheet)::collected_styles)
133 let last_stylesheet =
134 snd (List.find (fun (k, _) -> k = last_key) stylesheets)
136 (p_stylesheets, last_stylesheet)