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/
30 if debug then prerr_endline ("Helm_registry debugging: " ^ (Lazy.force s))
35 let rec aux last_element = function
38 (match last_element with
39 | Some elt when elt = hd -> aux last_element tl
40 | _ -> hd :: aux (Some hd) tl)
44 let starts_with prefix =
46 let rex = Str.regexp (Str.quote prefix) in
47 fun s -> Str.string_match rex s 0
49 let prefix_len = String.length prefix in
52 String.sub s 0 prefix_len = prefix
53 with Invalid_argument _ -> false
55 let hashtbl_keys tbl = Hashtbl.fold (fun k _ acc -> k :: acc) tbl []
56 let hashtbl_pairs tbl = Hashtbl.fold (fun k v acc -> (k,v) :: acc) tbl []
60 exception Malformed_key of string
61 exception Key_not_found of string
62 exception Cyclic_definition of string
63 exception Type_error of string (* expected type, value, msg *)
64 exception Parse_error of string * int * int * string (* file, line, col, msg *)
66 (* root XML tag: used by save_to, ignored by load_from *)
67 let root_tag = "helm_registry"
71 let backup_registry registry = Hashtbl.copy registry
72 let restore_registry backup registry =
73 Hashtbl.clear registry;
74 Hashtbl.iter (fun key value -> Hashtbl.add registry key value) backup
77 * - no sequences of '_' longer than 1 are permitted
79 let valid_step_rex_raw = "[a-zA-Z0-9]+\\(_[a-z0A-Z-9]+\\)*"
80 let valid_key_rex_raw =
81 sprintf "%s\\(\\.%s\\)*" valid_step_rex_raw valid_step_rex_raw
82 let valid_key_rex = Str.regexp ("^" ^ valid_key_rex_raw ^ "$")
83 let interpolated_key_rex = Str.regexp ("\\$(" ^ valid_key_rex_raw ^ ")")
84 let dot_rex = Str.regexp "\\."
85 let spaces_rex = Str.regexp "[ \t\n\r]+"
86 let heading_spaces_rex = Str.regexp "^[ \t\n\r]+"
87 let margin_blanks_rex =
88 Str.regexp "^\\([ \t\n\r]*\\)\\([^ \t\n\r]*\\)\\([ \t\n\r]*\\)$"
90 let strip_blanks s = Str.global_replace margin_blanks_rex "\\2" s
93 (* trailing blanks are removed per default by split *)
94 Str.split spaces_rex (Str.global_replace heading_spaces_rex "" s)
95 let merge l = String.concat " " l
97 let handle_type_error f x =
98 try f x with exn -> raise (Type_error (Printexc.to_string exn))
100 (** marshallers/unmarshallers *)
102 let int = handle_type_error int_of_string
103 let float = handle_type_error float_of_string
104 let bool = handle_type_error bool_of_string
106 let of_int = handle_type_error string_of_int
107 let of_float = handle_type_error string_of_float
108 let of_bool = handle_type_error string_of_bool
110 (* escapes for xml configuration file *)
111 let (escape, unescape) =
112 let (in_enc, out_enc) = (`Enc_utf8, `Enc_utf8) in
113 (Netencoding.Html.encode ~in_enc ~out_enc (),
114 Netencoding.Html.decode ~in_enc ~out_enc ~entity_base:`Xml ())
116 let key_is_valid key =
117 if not (Str.string_match valid_key_rex key 0) then
118 raise (Malformed_key key)
120 let set' ?(replace=true) registry ~key ~value =
121 debug_print (lazy (sprintf "Setting %s = %s" key value));
124 Hashtbl.replace registry key value
126 Hashtbl.add registry key value
128 let unset registry = Hashtbl.remove registry
130 let env_var_of_key = Str.global_replace dot_rex "__"
132 let singleton = function
134 raise (Type_error ("empty list value found where singleton was expected"))
137 let get registry key =
138 let rec aux stack key =
140 if List.mem key stack then begin
141 let msg = (String.concat " -> " (List.rev stack)) ^ " -> " ^ key in
142 raise (Cyclic_definition msg)
145 let registry_values = List.rev (Hashtbl.find_all registry key) in
146 let env_value = (* environment value *)
148 Some (Sys.getenv (env_var_of_key key))
149 with Not_found -> None
151 let values = (* resulting value *)
152 match registry_values, env_value with
153 | _, Some env -> [env]
154 | [], None -> raise (Key_not_found key)
155 | values, None -> values
157 List.map (interpolate (key :: stack)) values
158 and interpolate stack value =
159 Str.global_substitute interpolated_key_rex
161 let matched = Str.matched_string s in
162 (* "$(var)" -> "var" *)
163 let key = String.sub matched 2 (String.length matched - 3) in
164 singleton (aux stack key))
167 List.map strip_blanks (aux [] key)
171 let has registry key = Hashtbl.mem registry key
173 let get_typed registry unmarshaller key =
174 let value = singleton (get registry key) in
177 let set_typed registry marshaller ~key ~value =
178 set registry ~key ~value:(marshaller value)
180 let get_opt registry unmarshaller key =
182 Some (unmarshaller (singleton (get registry key)))
183 with Key_not_found _ -> None
185 let get_opt_default registry unmarshaller ~default key =
186 match get_opt registry unmarshaller key with
190 let set_opt registry marshaller ~key ~value =
192 | None -> unset registry key
193 | Some value -> set registry ~key ~value:(marshaller value)
195 let get_list registry unmarshaller key =
197 List.map unmarshaller (get registry key)
198 with Key_not_found _ -> []
200 let get_pair registry fst_unmarshaller snd_unmarshaller key =
201 let v = singleton (get registry key) in
202 match Str.split spaces_rex v with
203 | [fst; snd] -> fst_unmarshaller fst, snd_unmarshaller snd
204 | _ -> raise (Type_error "not a pair")
206 let set_list registry marshaller ~key ~value =
208 (fun v -> set ~replace:false registry ~key ~value:(marshaller v))
213 | Element of string * (string * string) list * xml_tree list
215 let dot_RE = Str.regexp "\\."
217 let xml_tree_of_registry registry =
218 let has_child name elements =
221 | Element (_, ["name", name'], _) when name = name' -> true
225 let rec get_child name = function
227 | (Element (_, ["name", name'], _) as child) :: tl when name = name' ->
230 let child, rest = get_child name tl in
233 let rec add_key path value tree =
234 match path, tree with
235 | [key], Element (name, attrs, children) ->
236 Element (name, attrs,
237 Element ("key", ["name", key],
238 [Cdata (strip_blanks value)]) :: children)
239 | dir :: path, Element (name, attrs, children) ->
240 if has_child dir children then
241 let child, rest = get_child dir children in
242 Element (name, attrs, add_key path value child :: rest)
244 Element (name, attrs,
245 ((add_key path value (Element ("section", ["name", dir], [])))
250 (fun k v tree -> add_key ((Str.split dot_RE k)) v tree)
252 (Element (root_tag, [], []))
254 let rec stream_of_xml_tree = function
255 | Cdata s -> Xml.xml_cdata s
256 | Element (name, attrs, children) ->
258 (List.map (fun (n, v) -> (None, n, v)) attrs)
259 (stream_of_xml_trees children)
260 and stream_of_xml_trees = function
262 | hd :: tl -> [< stream_of_xml_tree hd; stream_of_xml_trees tl >]
264 let save_to registry fname =
265 let token_stream = stream_of_xml_tree (xml_tree_of_registry registry) in
266 let oc = open_out fname in
267 Xml.pp_to_outchan token_stream oc;
270 let rec load_from_absolute ?path registry fname =
271 let _path = ref (match path with None -> [] | Some p -> p)in
272 (* <section> elements entered so far *)
273 let in_key = ref false in (* have we entered a <key> element? *)
274 let cdata = ref "" in (* collected cdata (inside <key> *)
275 let push_path name = _path := name :: !_path in
276 let pop_path () = _path := List.tl !_path in
277 let start_element tag attrs =
278 match tag, attrs with
279 | "section", ["name", name] -> push_path name
280 | "key", ["name", name] -> in_key := true; push_path name
281 | "helm_registry", _ -> ()
282 | "include", ["href", fname] ->
283 debug_print (lazy ("including file " ^ fname));
284 load_from_absolute ~path:!_path registry fname
286 raise (Parse_error (fname, ~-1, ~-1,
287 (sprintf "unexpected element <%s> or wrong attribute set" tag)))
289 let end_element tag =
291 | "section" -> pop_path ()
293 let key = String.concat "." (List.rev !_path) in
294 set registry ~key ~value:!cdata;
298 | "include" | "helm_registry" -> ()
301 let character_data text =
302 if !in_key then cdata := !cdata ^ text
305 XmlPushParser.default_callbacks with
306 XmlPushParser.start_element = Some start_element;
307 XmlPushParser.end_element = Some end_element;
308 XmlPushParser.character_data = Some character_data;
310 let xml_parser = XmlPushParser.create_parser callbacks in
311 let backup = backup_registry registry in
312 (* if path = None then Hashtbl.clear registry; *)
314 XmlPushParser.parse xml_parser (`File fname)
316 restore_registry backup registry;
319 let load_from registry ?path fname =
320 if Filename.is_relative fname then begin
321 let no_file_found = ref true in
324 | Some path -> path (* path given as argument *)
325 | None -> [ Sys.getcwd () ] (* no path given, try with cwd *)
329 let conffile = dir ^ "/" ^ fname in
330 if Sys.file_exists conffile then begin
331 no_file_found := false;
332 load_from_absolute registry conffile
335 if !no_file_found then
337 "Helm_registry.init: no configuration file named %s in [ %s ]"
338 fname (String.concat "; " path))
340 load_from_absolute registry fname
342 let fold registry ?prefix ?(interpolate = true) f init =
344 if interpolate then singleton (get registry k) else strip_blanks v
347 | None -> Hashtbl.fold (fun k v acc -> f acc k (value_of k v)) registry init
349 let key_matches = starts_with (s ^ ".") in
350 let rec fold_filter acc = function
352 | (k,v) :: tl when key_matches k ->
353 fold_filter (f acc k (value_of k v)) tl
354 | _ :: tl -> fold_filter acc tl
356 fold_filter init (hashtbl_pairs registry)
358 let iter registry ?prefix ?interpolate f =
359 fold registry ?prefix ?interpolate (fun _ k v -> f k v) ()
360 let to_list registry ?prefix ?interpolate () =
361 fold registry ?prefix ?interpolate (fun acc k v -> (k, v) :: acc) []
363 let ls registry prefix =
364 let prefix = prefix ^ "." in
365 let prefix_len = String.length prefix in
366 let key_matches = starts_with prefix in
367 let matching_keys = (* collect matching keys' _postfixes_ *)
370 if key_matches key then
371 String.sub key prefix_len (String.length key - prefix_len) :: acc
376 let (sections, keys) =
378 (fun (sections, keys) postfix ->
379 match Str.split dot_rex postfix with
380 | [key] -> (sections, key :: keys)
381 | hd_key :: _ -> (* length > 1 => nested section found *)
382 (hd_key :: sections, keys)
384 ([], []) matching_keys
386 (list_uniq (List.sort Pervasives.compare sections), keys)
388 (** {2 API implementation}
389 * functional methods above are wrapped so that they work on a default
390 * (imperative) registry*)
392 let default_registry = Hashtbl.create magic_size
394 let get key = singleton (get default_registry key)
395 let set = set default_registry
396 let has = has default_registry
397 let fold ?prefix ?interpolate f init =
398 fold default_registry ?prefix ?interpolate f init
399 let iter = iter default_registry
400 let to_list = to_list default_registry
401 let ls = ls default_registry
402 let get_typed unmarshaller = get_typed default_registry unmarshaller
403 let get_opt unmarshaller = get_opt default_registry unmarshaller
404 let get_opt_default unmarshaller = get_opt_default default_registry unmarshaller
405 let get_list unmarshaller = get_list default_registry unmarshaller
406 let get_pair unmarshaller = get_pair default_registry unmarshaller
407 let set_typed marshaller = set_typed default_registry marshaller
408 let set_opt unmarshaller = set_opt default_registry unmarshaller
409 let set_list marshaller = set_list default_registry marshaller
410 let unset = unset default_registry
411 let save_to = save_to default_registry
412 let load_from = load_from default_registry
413 let clear () = Hashtbl.clear default_registry
415 let get_string = get_typed string
416 let get_int = get_typed int
417 let get_float = get_typed float
418 let get_bool = get_typed bool
419 let set_string = set_typed of_string
420 let set_int = set_typed of_int
421 let set_float = set_typed of_float
422 let set_bool = set_typed of_bool