- the mathql interpreter is not helm-dependent any more

[helm.git] / helm / hbugs / common / hbugs_messages.ml

diff --git a/helm/hbugs/common/hbugs_messages.ml b/helm/hbugs/common/hbugs_messages.ml
index 0cc0f1b1fe599d079c21f79248a7253ebe361e10..b7e6f5ddc59a5cd7bdbed32c0d91df5fbe668b17 100644 (file)
--- a/helm/hbugs/common/hbugs_messages.ml
+++ b/helm/hbugs/common/hbugs_messages.ml
@@ -36,6 +36,7 @@ open Pxp_yacc;;
 let debug = true;;
 
 exception Attribute_not_found of string;;
+exception Empty_node;;  (** found a node with no _element_ children *)
 exception No_element_found of string;;
 exception Parse_error of string * string;;  (* parsing subject, reason *)
 exception Unexpected_message of message;;
@@ -47,17 +48,18 @@ let get_attr node name =
     | Value s -> s
     | _ -> raise Not_found)
   with Not_found -> raise (Attribute_not_found name)
+let assert_element n name =
+  match n#node_type with
+  | T_element n when n = name ->
+      ()
+  | _ -> raise (Parse_error ("", "Expected node: " ^ name))
 
   (** given a string representation of a proof asistant state (e.g. the first
   child of the XML root of a State_change or Start_musing message), build from
   it an HBugs view of a proof assistant state *)
 let parse_state (root: ('a node extension as 'a) node) =
-  let assert_element n name =
-    match n#node_type with
-    | T_element n when n = name ->
-        ()
-    | _ -> raise (Parse_error ("", "Expected node: " ^ name))
-  in
+  if (List.filter is_xml_element root#sub_nodes) = [] then
+    raise Empty_node;
   let buf = Buffer.create 10240 in
   let node_to_string (node: ('a node extension as 'a) node) =
     Buffer.clear buf;
@@ -69,15 +71,14 @@ let parse_state (root: ('a node extension as 'a) node) =
   let (goal_node, type_node, body_node) =
     try
       (find_element "CurrentGoal" root,
-       find_element "ConstantType" root,  (* TODO e' sempre ConstantType? *)
+       find_element "ConstantType" root,
        find_element "CurrentProof" root)
     with Not_found ->
       raise (Parse_error ("", "Malformed HBugs status XML document"))
   in
   assert_element root "gTopLevelStatus";
   assert_element goal_node "CurrentGoal";
-  assert_element type_node "ConstantType";  (* TODO: tutti gli xml 'type' hanno
-                                            come root element "ConstantType"? *)
+  assert_element type_node "ConstantType";
   assert_element body_node "CurrentProof";
   goal_node#write (`Out_buffer buf) `Enc_utf8;
   let (type_string, body_string) =
@@ -148,10 +149,14 @@ let msg_of_string' s =
   | T_element "state_change" ->
       let state_node =
         try
-          find_element ~deeply:false "gTopLevelStatus" root
-        with Not_found -> raise (No_element_found "gTopLevelStatus")
+          Some (find_element ~deeply:false "gTopLevelStatus" root)
+        with Not_found -> None
       in
-      State_change (get_attr root "id", parse_state state_node)
+      State_change
+        (get_attr root "id",
+        match state_node with
+        | Some n -> (try Some (parse_state n) with Empty_node -> None)
+        | None -> None)
   | T_element "wow" -> Wow (get_attr root "id")
 
     (* tutor -> broker *)
@@ -211,6 +216,8 @@ let msg_of_string' s =
   | T_element "abort_musing" ->
       Abort_musing (get_attr root "id", get_attr root "musing_id")
   | T_element "thanks" -> Thanks (get_attr root "id", get_attr root "musing_id")
+  | T_element "too_late" ->
+      Too_late (get_attr root "id", get_attr root "musing_id")
 
   | _ -> raise (No_element_found s)
 
@@ -219,18 +226,17 @@ let msg_of_string s =
     msg_of_string' s
   with e -> raise (Parse_error (s, Printexc.to_string e))
 
-let pp_state (type_string, body_string, goal) =
-  (* ASSUMPTION: type_string and body_string are well formed XML document
-  contents (i.e. they don't contain heading <?xml ... ?> declaration nor DOCTYPE
-  one *)
-  let res =
+let pp_state = function
+  | Some (type_string, body_string, goal) ->
+    (* ASSUMPTION: type_string and body_string are well formed XML document
+    contents (i.e. they don't contain heading <?xml ... ?> declaration nor
+    DOCTYPE one *)
     "<gTopLevelStatus>\n" ^
     (sprintf "<CurrentGoal>%d</CurrentGoal>\n" goal) ^
     type_string ^ "\n" ^
     body_string ^ "\n" ^
     "</gTopLevelStatus>\n"
-  in
-  res
+  | None -> "<gTopLevelStatus />\n"
 
 let rec pp_hint = function
   | Use_ring_Luke -> sprintf "<ring />"
@@ -315,7 +321,8 @@ let string_of_msg = function
   | Tutor_registered id -> sprintf "<tutor_registered id=\"%s\" />" id
   | Tutor_unregistered id -> sprintf "<tutor_unregistered id=\"%s\" />" id
   | Start_musing (id, state) ->
-      sprintf "<start_musing id=\"%s\">%s</start_musing>" id (pp_state state)
+      sprintf "<start_musing id=\"%s\">%s</start_musing>"
+        id (pp_state (Some state))
   | Abort_musing (id, musing_id) ->
       sprintf "<abort_musing id=\"%s\" musing_id=\"%s\" />" id musing_id
   | Thanks (id, musing_id) ->