1 (* Copyright (C) 2004-2005, HELM Team.
3 * This file is part of HELM, an Hypertextual, Electronic
4 * Library of Mathematics, developed at the Computer Science
5 * Department, University of Bologna, Italy.
7 * HELM is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version 2
10 * of the License, or (at your option) any later version.
12 * HELM is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with HELM; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place - Suite 330, Boston,
22 * For details, see the HELM World-Wide-Web page,
23 * http://helm.cs.unibo.it/
28 (** Functions "imported" from Http_getter_misc *)
30 let normalize_dir = Http_getter_misc.normalize_dir
31 let strip_suffix = Http_getter_misc.strip_suffix
33 let absolute_path file =
34 if file.[0] = '/' then file else Unix.getcwd () ^ "/" ^ file
36 let is_proof_script fname = true (** TODO Zack *)
37 let is_proof_object fname = true (** TODO Zack *)
39 let append_phrase_sep s =
40 if not (Pcre.pmatch ~pat:(sprintf "%s$" BuildTimeConf.phrase_sep) s) then
41 s ^ BuildTimeConf.phrase_sep
45 exception History_failure
47 type 'a memento = 'a array * int * int * int (* data, hd, tl, cur *)
49 class type ['a] history =
51 method add : 'a -> unit
54 method load: 'a memento -> unit
55 method save: 'a memento
60 class basic_history (head, tail, cur) =
62 val mutable hd = head (* insertion point *)
63 val mutable tl = tail (* oldest inserted item *)
64 val mutable cur = cur (* current item for the history *)
66 method is_begin = cur <= tl
67 method is_end = cur >= hd
71 class shell_history size =
72 let size = size + 1 in
73 let decr x = let x' = x - 1 in if x' < 0 then size + x' else x' in
74 let incr x = (x + 1) mod size in
76 val data = Array.create size ""
78 inherit basic_history (0, -1 , -1)
82 if tl = -1 then tl <- hd;
84 if hd = tl then tl <- incr tl;
87 if cur = tl then raise History_failure;
91 if cur = hd then raise History_failure;
93 if cur = hd then "" else data.(cur)
94 method load (data', hd', tl', cur') =
95 assert (Array.length data = Array.length data');
96 hd <- hd'; tl <- tl'; cur <- cur';
97 Array.blit data' 0 data 0 (Array.length data')
98 method save = (Array.copy data, hd, tl, cur)
101 class ['a] browser_history ?memento size init =
103 initializer match memento with Some m -> self#load m | _ -> ()
104 val data = Array.create size init
106 inherit basic_history (0, 0, 0)
109 if cur = tl then raise History_failure;
111 if cur = ~-1 then cur <- size - 1;
114 if cur = hd then raise History_failure;
116 if cur = size then cur <- 0;
119 if e <> data.(cur) then
122 if cur = size then cur <- 0;
123 if cur = tl then tl <- tl + 1;
124 if tl = size then tl <- 0;
128 method load (data', hd', tl', cur') =
129 assert (Array.length data = Array.length data');
130 hd <- hd'; tl <- tl'; cur <- cur';
131 Array.blit data' 0 data 0 (Array.length data')
132 method save = (Array.copy data, hd, tl, cur)
136 let instance = lazy (f ()) in
137 fun () -> Lazy.force instance
139 let image_path n = sprintf "%s/%s" BuildTimeConf.images_dir n
141 let end_ma_RE = Pcre.regexp "\\.ma$"
143 let list_tl_at ?(equality=(==)) e l =
146 | [] -> raise Not_found
147 | hd :: tl as l when equality hd e -> l