* http://cs.unibo.it/helm/.
*)
+
+
+
(*
* implementazione del'interprete MathQL
*)
-open MathQL;;
-open Eval;;
-open Utility;;
+
+
+
+
open Dbconn;;
-open Pattern;;
open Union;;
open Intersect;;
+open Meet;;
+open Sub;;
+open Context;;
open Diff;;
-open Sortedby;;
-open Use;;
-open Select;;
-open Letin;;
-open Mathql_semantics;;
-
-let prop_pool = ref None;;
-
-let fi_to_string fi =
- match fi with
- (None, _) ->
- ""
- | (Some i, y) ->
- "#xpointer(1/" ^
- string_of_int i ^
- (
- match y with
- None ->
- ""
- | Some j ->
- "/" ^ (string_of_int j)
- ) ^
- ")"
-;;
-
-let see_prop_pool () =
- let _ = print_endline "eccomi" in
- List.iter
- (fun elem -> print_endline (fst elem ^ ": " ^ snd elem))
- (match !prop_pool with Some l -> l | _ -> print_endline "ciao"; assert false)
-;;
+open Relation;;
+open Func;;
-(*
- * inizializzazione della connessione al database
- *)
-let init () =
- let _ = Dbconn.init () in
- let c = pgc () in
- let res =
- c#exec "select name,id from property where ns_id in (select id from namespace where url='http://www.cs.unibo.it/helm/schemas/mattone.rdf#')"
- in
- prop_pool := Some
- (
- List.map
- (function
- a::b::_ -> (a, b)
- | _ -> print_endline "no"; assert false
- )
- res#get_list
- )
-;;
-
-let get_prop_id prop =
- if prop="refObj" then "F"
- else if prop="backPointer" then "B"
- else List.assoc prop (match !prop_pool with Some l -> l | _ -> assert false)
-;;
-
-(* execute_ex env q *)
-(* [env] is the attributed uri environment in which the query [q] *)
-(* must be evaluated *)
-(* [q] is the query to evaluate *)
-(* It returns a [Mathql_semantics.result] *)
-let rec execute_ex env =
- function
- MQSelect (apvar, alist, abool) ->
- select_ex env apvar (execute_ex env alist) abool
- | MQUsedBy (alist, asvar) ->
- use_ex (execute_ex env alist) asvar (get_prop_id "refObj") (* "F" (*"refObj"*) *)
- | MQUse (alist, asvar) ->
- use_ex (execute_ex env alist) asvar (get_prop_id "backPointer") (* "B" (*"backPointer"*) *)
- | MQPattern (apreamble, apattern, afragid) ->
- pattern_ex (apreamble, apattern, afragid)
- | MQUnion (l1, l2) ->
- union_ex (execute_ex env l1) (execute_ex env l2)
- | MQDiff (l1, l2) ->
- diff_ex (execute_ex env l1) (execute_ex env l2)
- | MQSortedBy (l, o, f) ->
- sortedby_ex (execute_ex env l) o f
- | MQIntersect (l1, l2) ->
- intersect_ex (execute_ex env l1) (execute_ex env l2)
- | MQListRVar rvar -> [List.assoc rvar env]
- | MQLetIn (lvar, l1, l2) ->
- let t = Unix.time () in
- let res =
- (*CSC: The interesting code *)
- let _ = letin_ex lvar (execute_ex env l1) in
- execute_ex env l2
- (*CSC: end of the interesting code *)
- in
- letdispose ();
- print_string ("LETIN = " ^ string_of_int (List.length res) ^ ": ") ;
- print_endline (string_of_float (Unix.time () -. t) ^ "s") ;
- flush stdout ;
- res
- | MQListLVar lvar ->
- letref_ex lvar
- | MQReference l ->
- let rec build_result = function
- | [] -> []
- | s :: tail ->
- {uri = s ; attributes = [] ; extra = ""} :: build_result tail
- in build_result (List.sort compare l)
-;;
-
-(* Let's initialize the execute in Select, creating a cyclical recursion *)
-Select.execute := execute_ex;;
+let init connection_param = Dbconn.init connection_param
-(*
- * converte il risultato interno di una query (uri + contesto)
- * in un risultato di sole uri
- *
- * parametri:
- * l: string list list;
- *
- * output: mqresult;
- *
- * note:
- * il tipo del risultato mantenuto internamente e' diverso dal tipo di risultato
- * restituito in output poiche', mentre chi effettua le query vuole come risultato
- * solo le eventuali uri che soddisfano le query stesse, internamente ad una uri
- * sono associati anche i valori delle variabili che ancora non sono state valutate
- * perche', ad esempio, si trovano in altri rami dell'albero.
- *
- * Esempio:
- * SELECT x IN USE PATTERN "cic:/**.con" POSITION $a WHERE $a IS MainConclusion
- * L'albero corrispondente a questa query e':
- *
- * SELECT
- * / | \
- * x USE IS
- * / \ /\
- * PATTERN $a $a MainConclusion
- *
- * Nel momento in cui si esegue il ramo USE non sono noti i vincoli sullla variabile $a
- * percui e' necessario considerare, oltre alle uri, i valori della variabile per i quali
- * la uri puo' far parte del risultato.
- *)
-let xres_to_res l =
- MQRefs (List.map (function {Mathql_semantics.uri = uri} -> uri) l)
-(*
- let tmp = List.map (function {Mathql_semantics.uri = uri} -> uri) l in
- MQRefs
- (List.map
- (function l ->
- (*let _ = print_endline ("DEBUG: (mqint.ml: xres_to_res)" ^ l) in*)
- match Str.split (Str.regexp ":\|#\|/\|(\|)") l with
- hd::""::tl -> (
- match List.rev tl with
- n::"1"::"xpointer"::tail ->
- (
- Some hd,
- List.fold_left
- (fun par t ->
- match par with
- [] -> [MQBC t]
- | _ -> (MQBC t) :: MQBD :: par
- )
- []
- tail,
- [MQFC (int_of_string n)]
- )
- | n::m::"1"::"xpointer"::tail ->
- (
- Some hd,
- List.fold_left
- (fun par t ->
- match par with
- [] -> [MQBC t]
- | _ -> (MQBC t) :: MQBD :: par
- )
- []
- tail,
- [MQFC (int_of_string m); MQFC (int_of_string n)]
- )
- | tail ->
- (
- Some hd,
- List.fold_left
- (fun par t ->
- match par with
- [] -> [MQBC t]
- | _ -> (MQBC t) :: MQBD :: par
- )
- []
- tail,
- []
- )
- )
- | _ -> assert false
- )
- tmp
- )
-*)
-;;
+let close () = Dbconn.close ()
+let check () = Dbconn.pgc ()
-(*
- *
- *)
-let execute q =
- match q with
- MQList qq -> xres_to_res (execute_ex [] qq)
-;;
+exception BooleExpTrue
-(*
- * chiusura della connessione al database
- *)
-let close () = Dbconn.close ();;
+let stat = ref false
+
+let set_stat b = stat := b
+
+let get_stat () = ! stat
+
+(* valuta una MathQL.set_exp e ritorna un MathQL.resource_set *)
+
+let rec exec_set_exp c = function
+ MathQL.SVar svar -> List.assoc svar c.svars
+ | MathQL.RVar rvar -> [List.assoc rvar c.rvars]
+ | MathQL.Ref vexp -> List.map (fun s -> (s,[])) (exec_val_exp c vexp)
+ | MathQL.Intersect (sexp1, sexp2) ->
+ let before = Sys.time() in
+ let rs1 = exec_set_exp c sexp1 in
+ let rs2 = exec_set_exp c sexp2 in
+ let res = intersect_ex rs1 rs2 in
+ let after = Sys.time() in
+ let ll1 = string_of_int (List.length rs1) in
+ let ll2 = string_of_int (List.length rs2) in
+ let diff = string_of_float (after -. before) in
+ if !stat then
+ (print_endline("INTERSECT(" ^ ll1 ^ "," ^ ll2 ^ ") = " ^ string_of_int (List.length res) ^
+ ": " ^ diff ^ "s");
+ flush stdout);
+ res
+ | MathQL.Union (sexp1, sexp2) ->
+ let before = Sys.time () in
+ let res = union_ex (exec_set_exp c sexp1) (exec_set_exp c sexp2) in
+ let after = Sys.time() in
+ let diff = string_of_float (after -. before) in
+ if !stat then
+ (print_endline ("UNION: " ^ diff ^ "s");
+ flush stdout);
+ res
+ | MathQL.LetSVar (svar, sexp1, sexp2) ->
+ let before = Sys.time() in
+ let c1 = upd_svars c ((svar, exec_set_exp c sexp1) :: c.svars) in
+ let res = exec_set_exp c1 sexp2 in
+ if !stat then
+ (print_string ("LETIN " ^ svar ^ " = " ^ string_of_int (List.length res) ^ ": ");
+ print_endline (string_of_float (Sys.time() -. before) ^ "s");
+ flush stdout);
+ res
+ | MathQL.LetVVar (vvar, vexp, sexp) ->
+ let before = Sys.time() in
+ let c1 = upd_vvars c ((vvar, exec_val_exp c vexp) :: c.vvars) in
+ let res = exec_set_exp c1 sexp in
+ if !stat then
+ (print_string ("LETIN " ^ vvar ^ " = " ^ string_of_int (List.length res) ^ ": ");
+ print_endline (string_of_float (Sys.time() -. before) ^ "s");
+ flush stdout);
+ res
+ | MathQL.Relation (rop, path, sexp, attl) ->
+ let before = Sys.time() in
+ let res = relation_ex rop path (exec_set_exp c sexp) attl in
+ if !stat then
+ (print_string ("RELATION " ^ (List.hd path) ^ " = " ^ string_of_int(List.length res) ^ ": ");
+ print_endline (string_of_float (Sys.time() -. before) ^ "s");
+ flush stdout);
+ res
+ | MathQL.Select (rvar, sexp, bexp) ->
+ let before = Sys.time() in
+ let rset = (exec_set_exp c sexp) in
+ let rec select_ex rset =
+ match rset with
+ [] -> []
+ | r::tl -> let c1 = upd_rvars c ((rvar,r)::c.rvars) in
+ if (exec_boole_exp c1 bexp) then r::(select_ex tl)
+ else select_ex tl
+ in
+ let res = select_ex rset in
+ if !stat then
+ (print_string ("SELECT " ^ rvar ^ " = " ^ string_of_int (List.length res) ^ ": ");
+ print_endline (string_of_float (Sys.time() -. before) ^ "s");
+ flush stdout);
+ res
+ | MathQL.Diff (sexp1, sexp2) -> diff_ex (exec_set_exp c sexp1) (exec_set_exp c sexp2)
+ | _ -> assert false
+
+(* valuta una MathQL.boole_exp e ritorna un boole *)
+
+and exec_boole_exp c = function
+ MathQL.False -> false
+ | MathQL.True -> true
+ | MathQL.Not x -> not (exec_boole_exp c x)
+ | MathQL.And (x, y) -> (exec_boole_exp c x) && (exec_boole_exp c y)
+ | MathQL.Or (x, y) -> (exec_boole_exp c x) || (exec_boole_exp c y)
+ | MathQL.Sub (vexp1, vexp2) -> sub_ex (exec_val_exp c vexp1) (exec_val_exp c vexp2)
+ | MathQL.Meet (vexp1, vexp2) -> meet_ex (exec_val_exp c vexp1) (exec_val_exp c vexp2)
+ | MathQL.Eq (vexp1, vexp2) -> (exec_val_exp c vexp1) = (exec_val_exp c vexp2)
+ | MathQL.Ex l bexp ->
+ if l = [] then (exec_boole_exp c bexp)
+ else
+ let latt = List.map (fun uri ->
+ let (r,attl) = List.assoc uri c.rvars in (uri,attl)) l (*latt = l + attributi*)
+ in
+ try
+ let rec prod c = function
+ [] -> if (exec_boole_exp c bexp) then raise BooleExpTrue
+ | (uri,attl)::tail1 -> let rec sub_prod attl =
+ match attl with
+(*per ogni el. di attl *) [] -> ()
+(*devo andare in ric. su tail1*) | att::tail2 -> let c1 = upd_groups c ((uri,att)::c.groups) in
+ prod c1 tail1; sub_prod tail2
+ in
+ sub_prod attl
+ in
+ prod c latt; false
+ with BooleExpTrue -> true
+
+(* valuta una MathQL.val_exp e ritorna un MathQL.value *)
+
+and exec_val_exp c = function
+ MathQL.Const x -> let
+ ol = List.sort compare x in
+ let rec edup = function
+
+ [] -> []
+ | s::tl -> if tl <> [] then
+ if s = (List.hd tl) then edup tl
+ else s::(edup tl)
+ else s::[]
+ in
+ edup ol
+ | MathQL.Record (rvar, vvar) -> List.assoc vvar (List.assoc rvar c.groups)
+
+ | MathQL.VVar s -> List.assoc s c.vvars
+ | MathQL.RefOf sexp -> List.map (fun (s,_) -> s) (exec_set_exp c sexp)
+ | MathQL.Fun (s, vexp) -> fun_ex s (exec_val_exp c vexp)
+ | _ -> assert false
+
+(* valuta una MathQL.set_exp nel contesto vuoto e ritorna un MathQL.resource_set *)
+and execute x =
+ exec_set_exp {svars = []; rvars = []; groups = []; vvars = []} x
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