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/
38 let debug = 2;; (* 0 -> no debug
39 1 -> waiting for an answer / answer received
40 2 -> XML messages dumping
43 exception Attribute_not_found of string;;
44 exception Empty_node;; (** found a node with no _element_ children *)
45 exception No_element_found of string;;
46 exception Parse_error of string * string;; (* parsing subject, reason *)
47 exception Unexpected_message of message;;
49 let is_xml_element n = match n#node_type with T_element _ -> true | _ -> false
50 let get_attr node name =
52 (match node#attribute name with
54 | _ -> raise Not_found)
55 with Not_found -> raise (Attribute_not_found name)
56 let assert_element n name =
57 match n#node_type with
58 | T_element n when n = name ->
60 | _ -> raise (Parse_error ("", "Expected node: " ^ name))
62 (** given a string representation of a proof asistant state (e.g. the first
63 child of the XML root of a State_change or Start_musing message), build from
64 it an HBugs view of a proof assistant state *)
65 let parse_state (root: ('a node extension as 'a) node) =
66 if (List.filter is_xml_element root#sub_nodes) = [] then
68 let buf = Buffer.create 10240 in
69 let node_to_string (node: ('a node extension as 'a) node) =
71 node#write (`Out_buffer buf) `Enc_utf8;
72 let res = Buffer.contents buf in
76 let (goal_node, type_node, body_node) =
78 (find_element "CurrentGoal" root,
79 find_element "ConstantType" root,
80 find_element "CurrentProof" root)
82 raise (Parse_error ("", "Malformed HBugs status XML document"))
84 assert_element root "gTopLevelStatus";
85 assert_element goal_node "CurrentGoal";
86 assert_element type_node "ConstantType";
87 assert_element body_node "CurrentProof";
88 goal_node#write (`Out_buffer buf) `Enc_utf8;
89 let (type_string, body_string) =
90 (node_to_string type_node, node_to_string body_node)
94 int_of_string (goal_node#data)
95 with Failure "int_of_string" ->
96 raise (Parse_error (goal_node#data, "can't parse goal"))
98 (type_string, body_string, goal)
100 (** parse an hint from an XML node, XML node should have type 'T_element _'
101 (the name is ignored), attributes on it are ignored *)
102 let parse_hint node =
103 let rec parse_hint_node node =
104 match node#node_type with
105 | T_element "ring" -> Use_ring
106 | T_element "fourier" -> Use_fourier
107 | T_element "reflexivity" -> Use_reflexivity
108 | T_element "symmetry" -> Use_symmetry
109 | T_element "assumption" -> Use_assumption
110 | T_element "contradiction" -> Use_contradiction
111 | T_element "exists" -> Use_exists
112 | T_element "split" -> Use_split
113 | T_element "left" -> Use_left
114 | T_element "right" -> Use_right
115 | T_element "apply" -> Use_apply node#data
116 | T_element "hints" ->
118 (List.map parse_hint_node (List.filter is_xml_element node#sub_nodes))
119 | _ -> assert false (* CSC: should this assert false be a raise something? *)
121 match List.filter is_xml_element node#sub_nodes with
122 [node] -> parse_hint_node node
123 | _ -> assert false (* CSC: should this assert false be a raise something? *)
125 let parse_hint_type n = n#data (* TODO parsare il possibile tipo di suggerimento *)
126 let parse_tutor_dscs n =
128 (fun n -> (get_attr n "id", n#data))
129 (List.filter is_xml_element n#sub_nodes)
130 let parse_tutor_ids node =
132 (fun n -> get_attr n "id") (List.filter is_xml_element node#sub_nodes)
134 let tutors_sep = Pcre.regexp ",\\s*"
136 let pxp_config = PxpHelmConf.pxp_config
137 let msg_of_string' s =
138 let root = (* xml tree's root *)
139 parse_wfcontent_entity pxp_config (from_string s) PxpHelmConf.pxp_spec
141 match root#node_type with
143 (* general purpose *)
144 | T_element "help" -> Help
145 | T_element "usage" -> Usage root#data
146 | T_element "exception" -> Exception (get_attr root "name", root#data)
148 (* client -> broker *)
149 | T_element "register_client" ->
150 Register_client (get_attr root "id", get_attr root "url")
151 | T_element "unregister_client" -> Unregister_client (get_attr root "id")
152 | T_element "list_tutors" -> List_tutors (get_attr root "id")
153 | T_element "subscribe" ->
154 Subscribe (get_attr root "id", parse_tutor_ids root)
155 | T_element "state_change" ->
158 Some (find_element ~deeply:false "gTopLevelStatus" root)
159 with Not_found -> None
163 match state_node with
164 | Some n -> (try Some (parse_state n) with Empty_node -> None)
166 | T_element "wow" -> Wow (get_attr root "id")
168 (* tutor -> broker *)
169 | T_element "register_tutor" ->
170 let hint_node = find_element "hint_type" root in
171 let dsc_node = find_element "description" root in
173 (get_attr root "id", get_attr root "url",
174 parse_hint_type hint_node, dsc_node#data)
175 | T_element "unregister_tutor" -> Unregister_tutor (get_attr root "id")
176 | T_element "musing_started" ->
177 Musing_started (get_attr root "id", get_attr root "musing_id")
178 | T_element "musing_aborted" ->
179 Musing_started (get_attr root "id", get_attr root "musing_id")
180 | T_element "musing_completed" ->
183 find_element "eureka" root
184 with Not_found -> find_element "sorry" root
187 (get_attr root "id", get_attr root "musing_id",
188 (match main_node#node_type with
189 | T_element "eureka" ->
190 Eureka (parse_hint main_node)
191 | T_element "sorry" -> Sorry
192 | _ -> assert false)) (* can't be there, see 'find_element' above *)
194 (* broker -> client *)
195 | T_element "client_registered" -> Client_registered (get_attr root "id")
196 | T_element "client_unregistered" -> Client_unregistered (get_attr root "id")
197 | T_element "tutor_list" ->
198 Tutor_list (get_attr root "id", parse_tutor_dscs root)
199 | T_element "subscribed" ->
200 Subscribed (get_attr root "id", parse_tutor_ids root)
201 | T_element "state_accepted" ->
205 (fun n -> get_attr n "id")
206 (List.filter is_xml_element (find_element "stopped" root)#sub_nodes),
208 (fun n -> get_attr n "id")
209 (List.filter is_xml_element (find_element "started" root)#sub_nodes))
210 | T_element "hint" -> Hint (get_attr root "id", parse_hint root)
212 (* broker -> tutor *)
213 | T_element "tutor_registered" -> Tutor_registered (get_attr root "id")
214 | T_element "tutor_unregistered" -> Tutor_unregistered (get_attr root "id")
215 | T_element "start_musing" ->
218 find_element ~deeply:false "gTopLevelStatus" root
219 with Not_found -> raise (No_element_found "gTopLevelStatus")
221 Start_musing (get_attr root "id", parse_state state_node)
222 | T_element "abort_musing" ->
223 Abort_musing (get_attr root "id", get_attr root "musing_id")
224 | T_element "thanks" -> Thanks (get_attr root "id", get_attr root "musing_id")
225 | T_element "too_late" ->
226 Too_late (get_attr root "id", get_attr root "musing_id")
228 | _ -> raise (No_element_found s)
230 let msg_of_string s =
233 with e -> raise (Parse_error (s, Printexc.to_string e))
235 let pp_state = function
236 | Some (type_string, body_string, goal) ->
237 (* ASSUMPTION: type_string and body_string are well formed XML document
238 contents (i.e. they don't contain heading <?xml ... ?> declaration nor
240 "<gTopLevelStatus>\n" ^
241 (sprintf "<CurrentGoal>%d</CurrentGoal>\n" goal) ^
244 "</gTopLevelStatus>\n"
245 | None -> "<gTopLevelStatus />\n"
247 let rec pp_hint = function
248 | Use_ring -> sprintf "<ring />"
249 | Use_fourier -> sprintf "<fourier />"
250 | Use_reflexivity -> sprintf "<reflexivity />"
251 | Use_symmetry -> sprintf "<symmetry />"
252 | Use_assumption -> sprintf "<assumption />"
253 | Use_contradiction -> sprintf "<contradiction />"
254 | Use_exists -> sprintf "<exists />"
255 | Use_split -> sprintf "<split />"
256 | Use_left -> sprintf "<left />"
257 | Use_right -> sprintf "<right />"
258 | Use_apply term -> sprintf "<apply>%s</apply>" term
260 sprintf "<hints>\n%s\n</hints>"
261 (String.concat "\n" (List.map pp_hint hints))
263 let pp_hint_type s = s (* TODO pretty print hint_type *)
267 sprintf "%s<tutor_dsc id=\"%s\">%s</tutor_dsc>" s id dsc)
270 List.fold_left (fun s id -> sprintf "%s<tutor id=\"%s\" />" s id) ""
272 let string_of_msg = function
274 | Usage usage_string -> sprintf "<usage>%s</usage>" usage_string
275 | Exception (name, value) ->
276 sprintf "<exception name=\"%s\">%s</exception>" name value
277 | Register_client (id, url) ->
278 sprintf "<register_client id=\"%s\" url=\"%s\" />" id url
279 | Unregister_client id -> sprintf "<unregister_client id=\"%s\" />" id
280 | List_tutors id -> sprintf "<list_tutors id=\"%s\" />" id
281 | Subscribe (id, tutor_ids) ->
282 sprintf "<subscribe id=\"%s\">%s</subscribe>"
283 id (pp_tutor_ids tutor_ids)
284 | State_change (id, state) ->
285 sprintf "<state_change id=\"%s\">%s</state_change>"
287 | Wow id -> sprintf "<wow id=\"%s\" />" id
288 | Register_tutor (id, url, hint_type, dsc) ->
290 "<register_tutor id=\"%s\" url=\"%s\">
291 <hint_type>%s</hint_type>
292 <description>%s</description>
294 id url (pp_hint_type hint_type) dsc
295 | Unregister_tutor id -> sprintf "<unregister_tutor id=\"%s\" />" id
296 | Musing_started (id, musing_id) ->
297 sprintf "<musing_started id=\"%s\" musing_id=\"%s\" />" id musing_id
298 | Musing_aborted (id, musing_id) ->
299 sprintf "<musing_aborted id=\"%s\" musing_id=\"%s\" />" id musing_id
300 | Musing_completed (id, musing_id, result) ->
302 "<musing_completed id=\"%s\" musing_id=\"%s\">%s</musing_completed>"
305 | Sorry -> "<sorry />"
306 | Eureka hint -> sprintf "<eureka>%s</eureka>" (pp_hint hint))
307 | Client_registered id -> sprintf "<client_registered id=\"%s\" />" id
308 | Client_unregistered id -> sprintf "<client_unregistered id=\"%s\" />" id
309 | Tutor_list (id, tutor_dscs) ->
310 sprintf "<tutor_list id=\"%s\">%s</tutor_list>"
311 id (pp_tutor_dscs tutor_dscs)
312 | Subscribed (id, tutor_ids) ->
313 sprintf "<subscribed id=\"%s\">%s</subscribed>"
314 id (pp_tutor_ids tutor_ids)
315 | State_accepted (id, stop_ids, start_ids) ->
317 "<state_accepted id=\"%s\">
318 <stopped>%s</stopped>
319 <started>%s</started>
323 (List.map (fun id -> sprintf "<musing id=\"%s\" />" id) stop_ids))
325 (List.map (fun id -> sprintf "<musing id=\"%s\" />" id) start_ids))
326 | Hint (id, hint) -> sprintf "<hint id=\"%s\">%s</hint>" id (pp_hint hint)
327 | Tutor_registered id -> sprintf "<tutor_registered id=\"%s\" />" id
328 | Tutor_unregistered id -> sprintf "<tutor_unregistered id=\"%s\" />" id
329 | Start_musing (id, state) ->
330 sprintf "<start_musing id=\"%s\">%s</start_musing>"
331 id (pp_state (Some state))
332 | Abort_musing (id, musing_id) ->
333 sprintf "<abort_musing id=\"%s\" musing_id=\"%s\" />" id musing_id
334 | Thanks (id, musing_id) ->
335 sprintf "<thanks id=\"%s\" musing_id=\"%s\" />" id musing_id
336 | Too_late (id, musing_id) ->
337 sprintf "<too_late id=\"%s\" musing_id=\"%s\" />" id musing_id
340 (* debugging function that dump on stderr the sent messages *)
344 (sprintf "<SENDING_MESSAGE>\n%s\n</SENDING_MESSAGE>"
346 | State_change _ -> "<state_change>omissis ...</state_change>"
347 | msg -> string_of_msg msg))
350 let submit_req ~url msg =
352 if debug >= 1 then (prerr_string "Waiting for an answer ... "; flush stderr);
354 msg_of_string (Hbugs_misc.http_post ~body:(string_of_msg msg) url)
356 if debug >= 1 then (prerr_string "answer received!\n"; flush stderr);
359 let return_xml_msg body outchan =
360 Http_daemon.respond ~headers:["Content-Type", "text/xml"] ~body outchan
362 let respond_msg msg outchan =
364 return_xml_msg (string_of_msg msg) outchan
365 (* close_out outchan *)
367 let respond_exc name value = respond_msg (Exception (name, value));;