X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=helm%2FsearchEngine%2FsearchEngine.ml;h=1f45fe67c8424f6b075f24676d17b404e16792e3;hb=741b3e9014f940fbbd34bee7b606ff7e72170452;hp=622f10bd5a618979fcf19551b1c32a659536cd99;hpb=506b4b7597021c98e34fb65cf9d0bb7879f06e92;p=helm.git

diff --git a/helm/searchEngine/searchEngine.ml b/helm/searchEngine/searchEngine.ml
index 622f10bd5..1f45fe67c 100644
--- a/helm/searchEngine/searchEngine.ml
+++ b/helm/searchEngine/searchEngine.ml
@@ -1,4 +1,4 @@
-(* Copyright (C) 2002, HELM Team.
+(* Copyright (C) 2002-2004, HELM Team.
  * 
  * This file is part of HELM, an Hypertextual, Electronic
  * Library of Mathematics, developed at the Computer Science
@@ -28,44 +28,59 @@ module U = MQGUtil
 module G = MQueryGenerator
 module C = MQIConn
 
-open Http_types ;;
+open Http_types
 
-let debug = true;;
-let debug_print s = if debug then prerr_endline s;;
-Http_common.debug := true;;
-(* Http_common.debug := true;; *)
+let debug = true
+let debug_print s = if debug then prerr_endline s
+let _ = Http_common.debug := true
+(* let _ = Http_common.debug := false *)
 
-  (** accepted HTTP servers for ask_uwobo method forwarding *)
-let valid_servers =
- [ "mowgli.cs.unibo.it:58080" ; "mowgli.cs.unibo.it" ; "localhost:58080" ];;
+open Printf
 
-let mqi_flags = [] (* default MathQL interpreter options *)
+let daemon_name = "Search Engine"
 
-open Printf;;
+let string_tail s =
+  let len = String.length s in
+  String.sub s 1 (len-1)
 
-let daemon_name = "Search Engine";;
-let default_port = 58085;;
-let port_env_var = "SEARCH_ENGINE_PORT";;
+  (* First of all we load the configuration *)
+let _ =
+ let configuration_file = "/projects/helm/etc/searchEngine.conf.xml" in
+  Helm_registry.load_from configuration_file
 
-let pages_dir =
-  try
-    Sys.getenv "SEARCH_ENGINE_HTML_DIR"
-  with Not_found -> "html"  (* relative to searchEngine's document root *)
-;;
-let interactive_user_uri_choice_TPL = pages_dir ^ "/templateambigpdq1.html";;
-let interactive_interpretation_choice_TPL =
-  pages_dir ^ "/templateambigpdq2.html";;
-let constraints_choice_TPL = pages_dir ^ "/constraints_choice_template.html";;
-let final_results_TPL = pages_dir ^ "/templateambigpdq3.html";;
+let port = Helm_registry.get_int "search_engine.port"
+
+let pages_dir = Helm_registry.get "search_engine.html_dir"
+
+  (** accepted HTTP servers for ask_uwobo method forwarding *)
+let valid_servers= Helm_registry.get_string_list "search_engine.valid_servers"
+
+let interactive_user_uri_choice_TPL = pages_dir ^ "/moogle_chat1.html"
+let interactive_interpretation_choice_TPL = pages_dir ^ "/moogle_chat2.html"
+let constraints_choice_TPL = pages_dir ^ "/moogle_constraints_choice.html"
+let moogle_TPL = pages_dir ^ "/moogle.html"
+
+let my_own_url =
+ let ic = Unix.open_process_in "hostname -f" in
+ let hostname = input_line ic in
+ ignore (Unix.close_process_in ic);
+ sprintf "http://%s:%d" hostname port
 
 exception Chat_unfinished
+exception Invalid_action of string  (* invalid action for "/search" method *)
+exception Unbound_identifier of string
+
+let javascript_quote s =
+ let rex = Pcre.regexp "'" in
+ let rex' = Pcre.regexp "\"" in
+  Pcre.replace ~rex ~templ:"\\'"
+   (Pcre.replace ~rex:rex' ~templ:"\\\"" s)
 
   (* build a bool from a 1-character-string *)
 let bool_of_string' = function
   | "0" -> false
   | "1" -> true
   | s -> failwith ("Can't parse a boolean from string: " ^ s)
-;;
 
   (* build an int option from a string *)
 let int_of_string' = function
@@ -75,7 +90,6 @@ let int_of_string' = function
         Some (int_of_string s)
       with Failure "int_of_string" ->
         failwith ("Can't parse an int option from string: " ^ s)
-;;
 
   (* HTML pretty printers for mquery_generator types *)
 
@@ -88,41 +102,71 @@ let html_of_r_obj (pos, uri) =
         (U.text_of_depth pos "")
     else
       "<input type=\"hidden\" name=\"obj_depth\" />")
-;;
 
 let html_of_r_rel pos =
   sprintf
     "<tr><td><input type='checkbox' name='constr_rel' checked='on'/></td><td>%s</td><td><input name='rel_depth' size='2' type='text' value='%s' /></td></tr>"
     (U.text_of_position (pos:>T.full_position)) (U.text_of_depth (pos:>T.full_position) "")
-;;
 
 let html_of_r_sort (pos, sort) =
   sprintf
     "<tr><td><input type='checkbox' name='constr_sort' checked='on'/></td><td>%s</td><td>%s</td><td><input name='sort_depth' size='2' type='text' value='%s'/></td></tr>"
     (U.text_of_sort sort) (U.text_of_position (pos:>T.full_position)) (U.text_of_depth (pos:>T.full_position) "")
-;;
+
+let query_of_req (req: Http_types.request) =
+  match req#path with
+  | "/elim" -> "Elim"
+  | "/match" -> "Match"
+  | "/hint" -> "Hint"
+  | "/locate" -> "Locate"
+  | _ -> assert false
 
   (** pretty print a MathQL query result to an HELM theory file *)
-let theory_of_result result =
+let theory_of_result req result =
  let results_no = List.length result in
   if results_no > 0 then
    let mode = if results_no > 10 then "linkonly" else "typeonly" in
    let results =
     let idx = ref (results_no + 1) in
      List.fold_right
-      (fun (uri,attrs) i ->
+      (fun uri i ->
         decr idx ;
-        "<tr><td valign=\"top\">" ^ string_of_int !idx ^ ".</td><td><ht:OBJECT uri=\"" ^ uri ^ "\" mode=\"" ^ mode ^ "\"/></td></tr>" ^  i
-      ) result ""
+        sprintf
+          "<tr>
+           <td valign=\"top\">%d.</td>
+           <td><ht:OBJECT uri=\"%s\" mode=\"%s\"/></td>
+           </tr>%s"
+          !idx uri mode i)
+      result ""
    in
-    "<h1>Query Results:</h1><table xmlns:ht=\"http://www.cs.unibo.it/helm/namespaces/helm-theory\">" ^ results ^ "</table>"
+   sprintf
+    "<div class='resultsbar'>
+      <table width='100%%'>
+       <tr>
+        <td class='left'><b class='query_kind'>%s</b></td>
+        <td class='right'><b>%d</b> result%s found</td>
+       </tr>
+      </table>
+     </div>
+     <br />
+     <div>
+      <table xmlns:ht=\"http://www.cs.unibo.it/helm/namespaces/helm-theory\">%s</table>
+     </div>"
+    (query_of_req req)
+    results_no (if results_no > 1 then "s" else "") results
   else
-    "<h1>Query Results:</h1><p>No results found!</p>"
-;;
-
-let pp_result result =
- "<html xmlns:ht=\"http://www.cs.unibo.it/helm/namespaces/helm-theory\">\n<head><title>Query Results</title><style> A { text-decoration: none } </style></head>\n<body>" ^ theory_of_result result ^ "</body></html>"
-;;
+    "<div class='resultsbar'>no results found</div>"
+
+let pp_result req result =
+ sprintf
+   "<html xmlns:ht=\"http://www.cs.unibo.it/helm/namespaces/helm-theory\">
+     <head>
+      <title>Query results</title>
+      <style> A { text-decoration: none } </style>
+     </head>
+     <body>%s</body>
+    </html>"
+   (theory_of_result req result)
 
   (** chain application of Pcre substitutions *)
 let rec apply_substs substs line =
@@ -144,57 +188,55 @@ let fold_file f init fname =
   (** iter like function on files *)
 let iter_file f = fold_file (fun _ line -> f line) ()
 
-let (title_tag_RE, choices_tag_RE, msg_tag_RE, id_to_uris_RE, id_RE,
-    interpretations_RE, interpretations_labels_RE, results_RE, new_aliases_RE,
-    form_RE, variables_initialization_RE)
+let (expression_tag_RE, action_tag_RE, advanced_tag_RE,
+     advanced_checked_RE, simple_checked_RE,
+     title_tag_RE, no_choices_tag_RE, current_choices_tag_RE,  
+     choices_tag_RE, msg_tag_RE, id_to_uris_RE, id_RE, iden_tag_RE,
+     interpretations_RE, interpretations_labels_RE, results_RE, new_aliases_RE,
+     form_RE, variables_initialization_RE, search_engine_url_RE)
   =
-  (Pcre.regexp "@TITLE@", Pcre.regexp "@CHOICES@", Pcre.regexp "@MSG@",
-  Pcre.regexp "@ID_TO_URIS@", Pcre.regexp "@ID@",
-  Pcre.regexp "@INTERPRETATIONS@", Pcre.regexp "@INTERPRETATIONS_LABELS@",
-  Pcre.regexp "@RESULTS@", Pcre.regexp "@NEW_ALIASES@", Pcre.regexp "@FORM@",
-  Pcre.regexp "@VARIABLES_INITIALIZATION@")
+  (Pcre.regexp "@EXPRESSION@", Pcre.regexp "@ACTION@", Pcre.regexp "@ADVANCED@",
+   Pcre.regexp "@ADVANCED_CHECKED@", Pcre.regexp "@SIMPLE_CHECKED@",
+   Pcre.regexp "@TITLE@", Pcre.regexp "@NO_CHOICES@",  
+   Pcre.regexp "@CURRENT_CHOICES@",
+   Pcre.regexp "@CHOICES@", Pcre.regexp "@MSG@",
+   Pcre.regexp "@ID_TO_URIS@", Pcre.regexp "@ID@", Pcre.regexp "@IDEN@",
+   Pcre.regexp "@INTERPRETATIONS@", Pcre.regexp "@INTERPRETATIONS_LABELS@",
+   Pcre.regexp "@RESULTS@", Pcre.regexp "@NEW_ALIASES@", Pcre.regexp "@FORM@",
+   Pcre.regexp "@VARIABLES_INITIALIZATION@", Pcre.regexp "@SEARCH_ENGINE_URL@")
 let server_and_port_url_RE = Pcre.regexp "^http://([^/]+)/.*$"
 
-let port =
-  try
-    int_of_string (Sys.getenv port_env_var)
-  with
-  | Not_found -> default_port
-  | Failure "int_of_string" ->
-      prerr_endline "Warning: invalid port, reverting to default";
-      default_port
-;;
-
-let pp_error = sprintf "<html><body><h1>Error: %s</h1></body></html>";;
+(* let pp_error = sprintf "<html><body><h1>Error: %s</h1></body></html>" *)
+let pp_error title msg =
+  sprintf "<hr size='1' /><div><b class='error'>%s:</b> %s</div>" title msg
 
 let bad_request body outchan =
-  Http_daemon.respond_error ~status:(`Client_error `Bad_request) ~body outchan
-;;
+  Http_daemon.respond_error ~code:(`Status (`Client_error `Bad_request)) ~body
+    outchan
 
-let contype = "Content-Type", "text/html";;
+let contype = "Content-Type", "text/html"
 
 (* SEARCH ENGINE functions *)
 
 let get_constraints term =
  function
-    | "/locateInductivePrinciple" ->
-      CGLocateInductive.universe,
+    | "/elim" ->
+      None,
       (CGLocateInductive.get_constraints term),
       (None,None,None)
-    | "/searchPattern" ->
+    | "/match" ->
      let constr_obj, constr_rel, constr_sort =
        CGSearchPattern.get_constraints term in
-      CGSearchPattern.universe,
-       (constr_obj, constr_rel, constr_sort),
-       (Some constr_obj, Some constr_rel, Some constr_sort)
-    | "/matchConclusion" ->
+     (Some CGSearchPattern.universe),
+     (constr_obj, constr_rel, constr_sort),
+     (Some constr_obj, Some constr_rel, Some constr_sort)
+    | "/hint" ->
      let list_of_must, only = CGMatchConclusion.get_constraints [] [] term in
 (* FG: there is no way to choose the block number ***************************)
      let block = pred (List.length list_of_must) in 
-      CGMatchConclusion.universe, 
+      (Some CGMatchConclusion.universe), 
       (List.nth list_of_must block, [], []), (Some only, None, None)
     | _ -> assert false
-;;
 
 (*
   format:
@@ -267,40 +309,384 @@ let add_user_constraints ~constraints
       in
       (must', only')
   | _ -> failwith ("Can't parse constraint string: " ^ constraints)
-in
+
+let send_results results
+  ?(id_to_uris = DisambiguatingParser.EnvironmentP3.of_string "") 
+   (req: Http_types.request) outchan
+  =
+  Http_daemon.send_basic_headers ~code:(`Code 200) outchan ;
+  Http_daemon.send_header "Content-Type" "text/xml" outchan;
+  Http_daemon.send_CRLF outchan ;
+  let results_string =
+    match results with
+    | `Results r -> theory_of_result req r
+    | `Error msg -> msg
+  in
+  let subst =
+    (search_engine_url_RE, my_own_url) ::
+    (results_RE, results_string)::
+    (advanced_tag_RE, req#param "advanced")::
+    (expression_tag_RE, req#param "expression")::
+    (List.map
+      (function (key,value) ->
+        let key' = (Pcre.extract ~pat:"param\\.(.*)" key).(1) in
+        Pcre.regexp ("@" ^ key' ^ "@"), value)
+      (List.filter
+        (fun (key,_) as p-> Pcre.pmatch ~pat:"^param\\." key)
+        req#params)) @
+    (if req#param "advanced" = "no" then
+      [ simple_checked_RE, "checked='true'";
+        advanced_checked_RE, "" ]
+    else
+      [ simple_checked_RE, "";
+        advanced_checked_RE, "checked='true'" ])
+  in
+  iter_file
+    (fun line ->
+      let new_aliases =
+        DisambiguatingParser.EnvironmentP3.to_string id_to_uris
+      in
+      let processed_line =
+        apply_substs
+          (* CSC: Bug here: this is a string, not an array! *)
+          ((new_aliases_RE, "'" ^ javascript_quote new_aliases ^ "'")::subst) 
+          line
+      in
+      output_string outchan (processed_line ^ "\n"))
+    moogle_TPL
+
+let exec_action mqi_handle (req: Http_types.request) outchan =
+  let term_string = req#param "expression" in
+  let (context, metasenv) = ([], []) in
+  let id_to_uris_raw = 
+    try req#param "aliases" 
+    with Http_types.Param_not_found _ -> ""
+  in
+  let parse_interpretation_choices choices =
+    List.map int_of_string (Pcre.split ~pat:" " choices) in
+  let parse_choices choices_raw =
+    let choices = Pcre.split ~pat:";" choices_raw in
+      List.fold_left
+        (fun f x ->
+           match Pcre.split ~pat:"\\s" x with
+             | ""::id::tail
+             | id::tail when id<>"" ->
+                 (fun id' ->
+                    if id = id' then
+                      Some (List.map (fun u -> Netencoding.Url.decode u) tail)
+                    else
+                      f id')
+             | _ -> failwith "Can't parse choices")
+        (fun _ -> None)
+        choices
+  in
+  let id_to_uris =
+    DisambiguatingParser.EnvironmentP3.of_string id_to_uris_raw in
+  let id_to_choices =
+    try
+      let choices_raw = req#param "choices" in
+        parse_choices choices_raw
+    with Http_types.Param_not_found _ -> (fun _ -> None)
+  in
+  let interpretation_choices =
+    try
+      let choices_raw = req#param "interpretation_choices" in
+      if choices_raw = "" then None 
+      else Some (parse_interpretation_choices choices_raw)
+    with Http_types.Param_not_found _ -> None
+  in 
+  let module Chat: DisambiguateTypes.Callbacks =
+    struct
+
+      let interactive_user_uri_choice
+        ~selection_mode ?ok
+        ?enable_button_for_non_vars ~(title: string) ~(msg: string)
+        ~(id: string) (choices: string list)
+        =
+        (match id_to_choices id with
+           | Some choices -> choices
+           | None ->
+              if req#param "advanced" = "no" then
+                let isvar s =
+		  let len = String.length s in
+		  let suffix = String.sub s (len-4) 4 in
+		    not (suffix  = ".var") in
+		List.filter isvar choices
+	      else 
+               let msg = Pcre.replace ~pat:"\'" ~templ:"\\\'" msg in
+               (match selection_mode with
+                  | `SINGLE -> assert false
+                  | `MULTIPLE ->
+                      Http_daemon.send_basic_headers ~code:(`Code 200) outchan;
+                      Http_daemon.send_CRLF outchan ;
+                      let check_box uri =
+			"<input type=\"checkbox\" name=\"param.choices\" 
+                        value=\"" ^
+			uri ^ "\" />" ^ "<b>" ^ uri ^ "</b>" in
+(* aggiungere gli hyperlinks? *)
+                      let check_boxes = 
+			String.concat "<br />" 
+			  (List.map check_box choices) in
+		      iter_file
+                        (fun line ->
+                           let processed_line =
+			     apply_substs
+ 			       [advanced_tag_RE, req#param "advanced";
+                                choices_tag_RE, check_boxes;
+                                no_choices_tag_RE, 
+				   string_of_int (List.length choices);
+                                iden_tag_RE, id;
+                                current_choices_tag_RE, req#param "choices";  
+                                expression_tag_RE, req#param "expression";
+                                action_tag_RE, string_tail req#path ]
+			       line
+			   in
+                             output_string outchan (processed_line ^ "\n"))
+                        interactive_user_uri_choice_TPL;
+			raise Chat_unfinished))
+
+      let interactive_interpretation_choice interpretations =
+        match interpretation_choices with
+            Some l -> prerr_endline "CARRAMBA" ; l
+          | None ->
+              let html_interpretations =
+		let radio_button n = 
+		  "<input type=\"radio\" name=\"param.interp\" value=\"" ^
+		  (string_of_int n) ^ "\" />" in
+                let text interp =
+		  String.concat "<br />" 
+		    (List.map
+                       (fun (id, value) -> 
+			  sprintf "<span>%s = %s</span>" id value) 
+		       interp) in
+		let rec aux n = 
+		  function
+		      [] -> []
+                    | interp::tl ->
+			((radio_button n)^(text interp))::(aux (n+1) tl) in
+                String.concat "<br />" (aux 0 interpretations)
+              in
+              Http_daemon.send_basic_headers ~code:(`Code 200) outchan ;
+              Http_daemon.send_CRLF outchan ;
+              iter_file
+                (fun line ->
+                   let processed_line =
+                     apply_substs
+                       [advanced_tag_RE, req#param "advanced";
+                        interpretations_RE, html_interpretations;
+                        current_choices_tag_RE, req#param "choices";
+			expression_tag_RE, req#param "expression";
+                        action_tag_RE, string_tail req#path ]
+                        line
+                   in
+                   output_string outchan (processed_line ^ "\n"))
+                interactive_interpretation_choice_TPL;
+              raise Chat_unfinished
+
+      let input_or_locate_uri ~title ?id () =
+        match id with
+        | Some id -> raise (Unbound_identifier id)
+        | None -> assert false
+
+    end
+  in
+  let module Disambiguate' = DisambiguatingParser.Make(Chat) in
+  let (id_to_uris', metasenv', term') =
+    match
+      Disambiguate'.disambiguate_term mqi_handle
+        context metasenv term_string id_to_uris
+    with
+        [id_to_uris',metasenv',term'] -> id_to_uris',metasenv',term'
+      | _ -> assert false
+        in
+  let universe,
+  ((must_obj, must_rel, must_sort) as must'),
+  ((only_obj, only_rel, only_sort) as only) =
+    get_constraints term' req#path
+  in
+  if
+    (try ignore (req#param "constraints"); false
+    with Http_types.Param_not_found _ -> true) &&
+    (req#param "advanced" = "no") && (req#path = "/hint")
+  then
+    let dbd =
+      match mqi_handle.MQIConn.pgc with
+      |   MQIConn.MySQL_C conn -> conn
+      | _ -> assert false
+    in
+    let results = List.map snd (Match_concl.cmatch dbd term') in
+    send_results (`Results results) ~id_to_uris:id_to_uris' req outchan
+  else
+  let must'', only' =
+    (try
+       add_user_constraints
+         ~constraints:(req#param "constraints")
+         (must', only)
+     with Http_types.Param_not_found _ ->
+       if req#param "advanced" = "no" then
+	 (must',only)
+       else
+       let variables =
+         "var aliases = '" ^ id_to_uris_raw ^ "';\n" ^
+         "var constr_obj_len = " ^
+         string_of_int (List.length must_obj) ^ ";\n" ^
+         "var constr_rel_len = " ^
+         string_of_int (List.length must_rel) ^ ";\n" ^
+         "var constr_sort_len = " ^
+         string_of_int (List.length must_sort) ^ ";\n" in
+       let form =
+         (if must_obj = [] then "" else
+            "<h4>Obj constraints</h4>" ^
+            "<table>" ^
+            (String.concat "\n" (List.map html_of_r_obj must_obj)) ^
+            "</table>" ^
+            (* The following three lines to make Javascript create *)
+            (* the constr_obj[] and obj_depth[] arrays even if we  *)
+            (* have only one real entry.                           *)
+            "<input type=\"hidden\" name=\"constr_obj\" />" ^
+            "<input type=\"hidden\" name=\"obj_depth\" />") ^
+         (if must_rel = [] then "" else
+            "<h4>Rel constraints</h4>" ^
+            "<table>" ^
+            (String.concat "\n" (List.map html_of_r_rel must_rel)) ^
+            "</table>" ^
+            (* The following two lines to make Javascript create *)
+            (* the constr_rel[] and rel_depth[] arrays even if   *)
+            (* we have only one real entry.                      *)
+            "<input type=\"hidden\" name=\"constr_rel\" />" ^
+            "<input type=\"hidden\" name=\"rel_depth\" />") ^
+         (if must_sort = [] then "" else
+            "<h4>Sort constraints</h4>" ^
+            "<table>" ^
+            (String.concat "\n" (List.map html_of_r_sort must_sort)) ^
+            "</table>" ^
+            (* The following two lines to make Javascript create *)
+            (* the constr_sort[] and sort_depth[] arrays even if *)
+            (* we have only one real entry.                      *)
+            "<input type=\"hidden\" name=\"constr_sort\" />" ^
+            "<input type=\"hidden\" name=\"sort_depth\" />") ^
+         "<h4>Only constraints</h4>" ^
+         "Enforce Only constraints for objects: " ^
+         "<input type='checkbox' name='only_obj'" ^
+         (if only_obj = None then "" else " checked='yes'") ^
+         " /><br />" ^
+         "Enforce Rel constraints for objects: " ^
+         "<input type='checkbox' name='only_rel'" ^
+         (if only_rel = None then "" else " checked='yes'") ^
+         " /><br />" ^
+         "Enforce Sort constraints for objects: " ^
+         "<input type='checkbox' name='only_sort'" ^
+         (if only_sort = None then "" else " checked='yes'") ^
+         " /><br />"
+       in
+       Http_daemon.send_basic_headers ~code:(`Code 200) outchan ;
+       Http_daemon.send_CRLF outchan ;
+       iter_file
+         (fun line ->
+            let processed_line =
+              apply_substs
+                [form_RE, form ;
+                 variables_initialization_RE, variables;
+                 advanced_tag_RE, req#param "advanced";
+                 current_choices_tag_RE, req#param "choices";
+                 interpretations_RE, req#param "interpretation_choices"; 
+                 expression_tag_RE, req#param "expression";
+                 action_tag_RE, string_tail req#path]  line
+            in
+              output_string outchan (processed_line ^ "\n"))
+         constraints_choice_TPL; 
+       raise Chat_unfinished)
+  in
+  let query =
+    G.query_of_constraints universe must'' only'
+  in
+  let results = MQueryInterpreter.execute mqi_handle query in 
+  send_results (`Results (List.map fst results))
+    ~id_to_uris:id_to_uris' req outchan
 
 (* HTTP DAEMON CALLBACK *)
 
-let callback (req: Http_types.request) outchan =
+let build_dynamic_uri url params =
+  let p = 
+    String.concat "&" (List.map  (fun (key,value) -> (key ^ "=" ^ (Netencoding.Url.encode value))) params) in
+  url ^ "?" ^ p
+
+let build_uwobo_request (req: Http_types.request) outchan =
+  prerr_endline ("ECCOLO: " ^ req#param "param.SEARCH_ENGINE_URL");
+  let xmluri = build_dynamic_uri ((req#param "param.SEARCH_ENGINE_URL") ^ "/search") req#params in
+  prerr_endline ("xmluri: " ^ xmluri);
+  (*let xmluri = Netencoding.Url.encode xmluri in*)
+  let server_and_port = req#param "param.processorURL" in
+  let newreq = 
+    build_dynamic_uri 
+      (server_and_port ^ "apply") 
+      (("xmluri",xmluri)::("keys",(req#param "param.thkeys"))::req#params) in
+  (* if List.mem server_and_port valid_servers then *)
+  prerr_endline newreq;
+  if true then 
+    Http_daemon.respond
+      ~headers:["Content-Type", "text/html"]
+      ~body:(Http_client.http_get newreq)
+      outchan
+  else
+    Http_daemon.respond
+      ~body:(pp_error "Untrusted UWOBO server" server_and_port)
+      outchan
+
+let proxy url outchan =
+  let server_and_port =
+    (Pcre.extract ~rex:server_and_port_url_RE url).(1)
+  in
+  if List.mem server_and_port valid_servers then
+    Http_daemon.respond
+      ~headers:["Content-Type", "text/html"]
+      ~body:(Http_client.http_get url)
+      outchan
+  else
+    Http_daemon.respond
+      ~body:(pp_error "Untrusted UWOBO server" server_and_port)
+      outchan
+
+let callback mqi_handle (req: Http_types.request) outchan =
   try
     debug_print (sprintf "Received request: %s" req#path);
     (match req#path with
+    | "/help" -> Http_daemon.respond ~body:"HELM Search Engine" outchan
+    | "/locate" ->
+        let initial_expression =
+          try req#param "expression" with Http_types.Param_not_found _ -> ""
+        in
+        let expression =
+          Pcre.replace ~pat:"\\s*$"
+            (Pcre.replace ~pat:"^\\s*" initial_expression)
+        in
+        if expression = "" then
+          send_results (`Results []) req outchan
+        else
+          let results =
+            let query = G.locate expression in
+             MQueryInterpreter.execute mqi_handle query
+          in
+          send_results (`Results (List.map fst results)) req outchan
     | "/execute" ->
-        let mqi_handle = C.init mqi_flags debug_print in 
         let query_string = req#param "query" in
         let lexbuf = Lexing.from_string query_string in
         let query = MQueryUtil.query_of_text lexbuf in
         let result = MQueryInterpreter.execute mqi_handle query in
-        let result_string = pp_result result in
-	      C.close mqi_handle;
+        let result_string = pp_result req (List.map fst result) in
         Http_daemon.respond ~body:result_string ~headers:[contype] outchan
-    | "/locate" ->
-        let mqi_handle = C.init mqi_flags debug_print in
-        let id = req#param "id" in
-        let query = G.locate id in
-	let result = MQueryInterpreter.execute mqi_handle query in
-	      C.close mqi_handle;
-        Http_daemon.respond ~headers:[contype] ~body:(pp_result result) outchan
+(*  Http_daemon.respond ~headers:[contype] ~body:(pp_result req result) outchan *)
     | "/unreferred" ->
-        let mqi_handle = C.init mqi_flags debug_print in
         let target = req#param "target" in
         let source = req#param "source" in
-	let query = G.unreferred target source in
-	let result = MQueryInterpreter.execute mqi_handle query in
-	      C.close mqi_handle;
-        Http_daemon.respond ~headers:[contype] ~body:(pp_result result) outchan
+        let query = G.unreferred target source in
+        let result = MQueryInterpreter.execute mqi_handle query in
+        Http_daemon.respond ~headers:[contype]
+          ~body:(pp_result req (List.map fst result)) outchan
     | "/getpage" ->
         (* TODO implement "is_permitted" *)
+        let _ = prerr_endline 
+	  (Netencoding.Url.encode "http://mowgli.cs.unibo.it:38080/") in 
         (let is_permitted _ = true in
         let remove_fragment uri = Pcre.replace ~pat:"#.*" uri in
         let page = remove_fragment (req#param "url") in
@@ -312,7 +698,7 @@ let callback (req: Http_types.request) outchan =
         (match page with
         | page when is_permitted page ->
             (let fname = sprintf "%s/%s" pages_dir (remove_fragment page) in
-            Http_daemon.send_basic_headers ~code:200 outchan;
+            Http_daemon.send_basic_headers ~code:(`Code 200) outchan;
             Http_daemon.send_header "Content-Type" "text/html" outchan;
             Http_daemon.send_CRLF outchan;
             if preprocess then begin
@@ -320,6 +706,9 @@ let callback (req: Http_types.request) outchan =
                 (fun line ->
                   output_string outchan
                     ((apply_substs
+                       ((search_engine_url_RE, my_own_url) ::
+                        (advanced_tag_RE, "no") ::
+                        (results_RE, "") ::
                        (List.map
                          (function (key,value) ->
                            let key' =
@@ -330,311 +719,42 @@ let callback (req: Http_types.request) outchan =
                          (List.filter
                            (fun (key,_) as p-> Pcre.pmatch ~pat:"^param\\." key)
                            req#params)
-                       )
+                       ))
                        line) ^
                     "\n"))
                 fname
             end else
               Http_daemon.send_file ~src:(FileSrc fname) outchan)
         | page -> Http_daemon.respond_forbidden ~url:page outchan))
-    | "/ask_uwobo" ->
-      let url = req#param "url" in
-      let server_and_port =
-        (Pcre.extract ~rex:server_and_port_url_RE url).(1)
-      in
-      if List.mem server_and_port valid_servers then
-        Http_daemon.respond
-          ~headers:["Content-Type", "text/html"]
-          ~body:(Http_client.Convenience.http_get url)
-          outchan
-      else
-        Http_daemon.respond
-          ~body:(pp_error ("Untrusted UWOBO server: " ^ server_and_port))
-          outchan
-    | "/searchPattern"
-    | "/matchConclusion"
-    | "/locateInductivePrinciple" ->
-        let mqi_handle = C.init mqi_flags debug_print in
-        let term_string = req#param "term" in
-        let lexbuf = Lexing.from_string term_string in
-        let (context, metasenv) = ([], []) in
-        let (dom, mk_metasenv_and_expr) =
-          CicTextualParserContext.main
-            ~context ~metasenv CicTextualLexer.token lexbuf
-        in
-        let id_to_uris_raw = req#param "aliases" in
-        let tokens = Pcre.split ~pat:"\\s" id_to_uris_raw in
-        let rec parse_tokens keys lookup = function (* TODO spostarla fuori *)
-          | [] -> keys, lookup
-          | "alias" :: key :: value :: rest ->
-              let key' = CicTextualParser0.Id key in
-               parse_tokens
-                 (key'::keys)
-                 (fun id ->
-                   if id = key' then
-                     Some
-                      (CicTextualParser0.Uri (MQueryMisc.cic_textual_parser_uri_of_string value))
-                   else lookup id)
-                 rest
-          | _ -> failwith "Can't parse aliases"
-        in
-        let parse_choices choices_raw =
-          let choices = Pcre.split ~pat:";" choices_raw in
-          List.fold_left
-            (fun f x ->
-              match Pcre.split ~pat:"\\s" x with
-              | ""::id::tail
-              | id::tail when id<>"" ->
-                  (fun id' ->
-prerr_endline ("#### " ^ id ^ " :=");
-List.iter (fun u -> prerr_endline ("<" ^ Netencoding.Url.decode u ^ ">")) tail;
-                    if id = id' then
-                      Some (List.map (fun u -> Netencoding.Url.decode u) tail)
-                    else
-                      f id')
-              | _ -> failwith "Can't parse choices")
-            (fun _ -> None)
-            choices
-        in
-        let (id_to_uris : Disambiguate.domain_and_interpretation) =
-         parse_tokens [] (fun _ -> None) tokens in
-        let id_to_choices =
-          try
-            let choices_raw = req#param "choices" in
-            parse_choices choices_raw
-          with Http_types.Param_not_found _ -> (fun _ -> None)
-        in
-        let module Chat: Disambiguate.Callbacks =
-          struct
-
-            let get_metasenv () =
-             !CicTextualParser0.metasenv
-
-            let set_metasenv metasenv =
-              CicTextualParser0.metasenv := metasenv
-
-            let output_html = prerr_endline
-
-            let interactive_user_uri_choice
-              ~selection_mode ?ok
-              ?enable_button_for_non_vars ~(title: string) ~(msg: string)
-              ~(id: string) (choices: string list)
-              =
-                (match id_to_choices id with
-                | Some choices -> choices
-                | None ->
-                  let msg = Pcre.replace ~pat:"\'" ~templ:"\\\'" msg in
-                  (match selection_mode with
-                  | `SINGLE -> assert false
-                  | `EXTENDED ->
-                      Http_daemon.send_basic_headers ~code:200 outchan ;
-                      Http_daemon.send_CRLF outchan ;
-                      iter_file
-                        (fun line ->
-                          let formatted_choices =
-                            String.concat ","
-                              (List.map (fun uri -> sprintf "\'%s\'" uri) choices)
-                          in
-                          let processed_line =
-                            apply_substs
-                              [title_tag_RE, title;
-                               choices_tag_RE, formatted_choices;
-                               msg_tag_RE, msg;
-                               id_to_uris_RE, id_to_uris_raw;
-                               id_RE, id]
-                              line
-                          in
-                          output_string outchan (processed_line ^ "\n"))
-                        interactive_user_uri_choice_TPL;
-                      raise Chat_unfinished))
-
-            let interactive_interpretation_choice interpretations =
-              let html_interpretations_labels =
-                String.concat ", "
-                  (List.map
-                    (fun l ->
-                      "\'" ^
-                      (String.concat "<br />"
-                        (List.map
-                          (fun (id, value) ->
-                            (sprintf "alias %s %s" id value))
-                          l)) ^
-                      "\'")
-                  interpretations)
-              in
-              let html_interpretations =
-                String.concat ", "
-                  (List.map
-                    (fun l ->
-                      "\'" ^
-                      (String.concat " "
-                        (List.map
-                          (fun (id, value) ->
-                            (sprintf "alias %s %s"
-                              id
-                              (MQueryMisc.wrong_xpointer_format_from_wrong_xpointer_format'
-                                value)))
-                          l)) ^
-                      "\'")
-                    interpretations)
-              in
-              Http_daemon.send_basic_headers ~code:200 outchan ;
-              Http_daemon.send_CRLF outchan ;
-              iter_file
-                (fun line ->
-                  let processed_line =
-                    apply_substs
-                      [interpretations_RE, html_interpretations;
-                       interpretations_labels_RE, html_interpretations_labels]
-                      line
-                  in
-                  output_string outchan (processed_line ^ "\n"))
-                interactive_interpretation_choice_TPL;
-              raise Chat_unfinished
-
-            let input_or_locate_uri ~title =
-              UriManager.uri_of_string "cic:/Coq/Init/DataTypes/nat_ind.con"
-
-          end
-        in
-        let module Disambiguate' = Disambiguate.Make (Chat) in
-        let (id_to_uris', metasenv', term') =
-          Disambiguate'.disambiguate_input mqi_handle
-            context metasenv dom mk_metasenv_and_expr id_to_uris
-        in
-        (match metasenv' with
-        | [] ->
-            let universe,
-                ((must_obj, must_rel, must_sort) as must'),
-                ((only_obj, only_rel, only_sort) as only) =
-              get_constraints term' req#path
-            in
-            let must'', only' =
-              (try
-                add_user_constraints
-                  ~constraints:(req#param "constraints")
-                  (must', only)
-              with Http_types.Param_not_found _ ->
-                let variables =
-                 "var aliases = '" ^ id_to_uris_raw ^ "';\n" ^
-                 "var constr_obj_len = " ^
-                  string_of_int (List.length must_obj) ^ ";\n" ^
-                 "var constr_rel_len = " ^
-                  string_of_int (List.length must_rel) ^ ";\n" ^
-                 "var constr_sort_len = " ^
-                  string_of_int (List.length must_sort) ^ ";\n" in
-                let form =
-                  (if must_obj = [] then "" else
-                    "<h4>Obj constraints</h4>" ^
-                    "<table>" ^
-                    (String.concat "\n" (List.map html_of_r_obj must_obj)) ^
-                    "</table>" ^
-                    (* The following three lines to make Javascript create *)
-                    (* the constr_obj[] and obj_depth[] arrays even if we  *)
-                    (* have only one real entry.                           *)
-                    "<input type=\"hidden\" name=\"constr_obj\" />" ^
-                    "<input type=\"hidden\" name=\"obj_depth\" />") ^
-                  (if must_rel = [] then "" else
-                   "<h4>Rel constraints</h4>" ^
-                   "<table>" ^
-                   (String.concat "\n" (List.map html_of_r_rel must_rel)) ^
-                   "</table>" ^
-                    (* The following two lines to make Javascript create *)
-                    (* the constr_rel[] and rel_depth[] arrays even if   *)
-                    (* we have only one real entry.                      *)
-                    "<input type=\"hidden\" name=\"constr_rel\" />" ^
-                    "<input type=\"hidden\" name=\"rel_depth\" />") ^
-                  (if must_sort = [] then "" else
-                    "<h4>Sort constraints</h4>" ^
-                    "<table>" ^
-                    (String.concat "\n" (List.map html_of_r_sort must_sort)) ^
-                    "</table>" ^
-                    (* The following two lines to make Javascript create *)
-                    (* the constr_sort[] and sort_depth[] arrays even if *)
-                    (* we have only one real entry.                      *)
-                    "<input type=\"hidden\" name=\"constr_sort\" />" ^
-                    "<input type=\"hidden\" name=\"sort_depth\" />") ^
-                    "<h4>Only constraints</h4>" ^
-                    "Enforce Only constraints for objects: " ^
-                      "<input type='checkbox' name='only_obj'" ^
-                      (if only_obj = None then "" else " checked='yes'") ^ " /><br />" ^
-                    "Enforce Rel constraints for objects: " ^
-                      "<input type='checkbox' name='only_rel'" ^
-                      (if only_rel = None then "" else " checked='yes'") ^ " /><br />" ^
-                    "Enforce Sort constraints for objects: " ^
-                      "<input type='checkbox' name='only_sort'" ^
-                      (if only_sort = None then "" else " checked='yes'") ^ " /><br />"
-                in
-                Http_daemon.send_basic_headers ~code:200 outchan ;
-                Http_daemon.send_CRLF outchan ;
-                iter_file
-                  (fun line ->
-                    let processed_line =
-                      apply_substs
-                       [form_RE, form ;
-                        variables_initialization_RE, variables] line
-                    in
-                    output_string outchan (processed_line ^ "\n"))
-                  constraints_choice_TPL;
-                  raise Chat_unfinished)
-            in
-            let query =
-             G.query_of_constraints (Some universe) must'' only'
-            in
-	          let results = MQueryInterpreter.execute mqi_handle query in 
-             Http_daemon.send_basic_headers ~code:200 outchan ;
-             Http_daemon.send_CRLF outchan ;
-             iter_file
-               (fun line ->
-                 let new_aliases =
-                   match id_to_uris' with
-                   | (domain, f) ->
-                       String.concat ", "
-                         (List.map
-                           (fun name ->
-                             sprintf "\'alias %s cic:%s\'"
-                               (match name with
-                                   CicTextualParser0.Id name -> name
-                                 | _ -> assert false (*CSC: completare *))
-                               (match f name with
-                               | None -> assert false
-                               | Some (CicTextualParser0.Uri t) ->
-                                   MQueryMisc.string_of_cic_textual_parser_uri
-                                     t
-                               | _ -> assert false (*CSC: completare *)))
-                           domain)
-                 in
-                 let processed_line =
-                   apply_substs
-                     [results_RE, theory_of_result results ;
-                      new_aliases_RE, new_aliases]
-                     line
-                 in
-                 output_string outchan (processed_line ^ "\n"))
-               final_results_TPL
-        | _ -> (* unable to instantiate some implicit variable *)
-            Http_daemon.respond
-              ~headers:[contype]
-              ~body:"some implicit variables are still unistantiated :-("
-              outchan);
-            C.close mqi_handle
+    (* OLD | "/ask_uwobo" -> proxy (req#param "url") outchan *)
+    | "/ask_uwobo" -> build_uwobo_request req outchan
+    | "/hint" | "/match" | "/elim" -> exec_action mqi_handle req outchan
     | invalid_request ->
-        Http_daemon.respond_error ~status:(`Client_error `Bad_request) outchan);
+        Http_daemon.respond_error ~code:(`Status (`Client_error `Bad_request))
+          outchan);
     debug_print (sprintf "%s done!" req#path)
   with
   | Chat_unfinished -> prerr_endline "Chat unfinished, Try again!"
   | Http_types.Param_not_found attr_name ->
       bad_request (sprintf "Parameter '%s' is missing" attr_name) outchan
-  | exc ->
-      Http_daemon.respond
-        ~body:(pp_error ("Uncaught exception: " ^ (Printexc.to_string exc)))
-        outchan
-in
-printf "%s started and listening on port %d\n" daemon_name port;
-printf "Current directory is %s\n" (Sys.getcwd ());
-printf "HTML directory is %s\n" pages_dir;
-flush stdout;
-Unix.putenv "http_proxy" "";
-Http_daemon.start' ~port callback;
-printf "%s is terminating, bye!\n" daemon_name
+  | CicTextualParser2.Parse_error msg ->
+      send_results (`Error (pp_error "Parse_error" msg)) req outchan
+  | Unbound_identifier id ->
+      send_results (`Error (pp_error "Unbound identifier" id)) req outchan
+  | exn ->
+      let exn_string = Printexc.to_string exn in
+      debug_print exn_string;
+      let msg = pp_error "Uncaught exception" exn_string in
+      send_results (`Error msg) req outchan
+
+let _ =
+  printf "%s started and listening on port %d\n" daemon_name port;
+  printf "Current directory is %s\n" (Sys.getcwd ());
+  printf "HTML directory is %s\n" pages_dir;
+  flush stdout;
+  Unix.putenv "http_proxy" "";
+  let mqi_handle = C.init ~log:debug_print () in
+  Http_daemon.start' ~port (callback mqi_handle);
+  C.close mqi_handle;
+  printf "%s is terminating, bye!\n" daemon_name