(* AUTOR: Ferruccio Guidi <fguidi@cs.unibo.it>
*)
-(* contexts *****************************************************************)
+exception Found
-type svar_context = (MathQL.svar * MathQL.resource_set) list
+module M = MathQL
+module P = MQueryUtil
+module C = MQIConn
+module U = MQIUtil
+module L = MQILib
+module F = MQueryIO
+
+(* contexts *****************************************************************)
-type avar_context = (MathQL.avar * MathQL.resource) list
+type svar_context = (M.svar * M.resource_set) list
-type group_context = (MathQL.avar * MathQL.attribute_group) list
+type avar_context = (M.avar * M.resource) list
-type vvar_context = (MathQL.vvar * MathQL.value) list
+type group_context = (M.avar * M.attribute_group) list
type context = {svars: svar_context;
avars: avar_context;
- groups: group_context; (* auxiliary context *)
- vvars: vvar_context
+ groups: group_context (* auxiliary context *)
}
-
-(* execute *****************************************************************)
-
-exception Found
-
-module M = MathQL
-module P = MQueryUtil
-module C = MQIConn
-module U = MQIUtil
+
+(* execute ******************************************************************)
let execute h x =
let warn q =
if C.set h C.Warn then
begin
C.log h "MQIExecute: waring: reference to undefined variables: ";
- P.text_of_query (C.log h) q "\n"
+ F.text_of_query (C.log h) "\n" q
end
in
- let rec eval_val c = function
- | M.False -> U.mql_false
- | M.True -> U.mql_true
- | M.Const s -> [s]
- | M.Set l -> U.iter (eval_val c) l
- | M.Test k y1 y2 ->
- let cand y1 y2 =
- if eval_val c y1 = U.mql_false then U.mql_false else eval_val c y2
- in
- let cor y1 y2 =
- let v1 = eval_val c y1 in
- if v1 = U.mql_false then eval_val c y2 else v1
- in
- let h f y1 y2 = f (eval_val c y1) (eval_val c y2) in
- let f = match k with
- | M.And -> cand
- | M.Or -> cor
- | M.Xor -> h U.xor
- | M.Sub -> h U.set_sub
- | M.Meet -> h U.set_meet
- | M.Eq -> h U.set_eq
- | M.Le -> h U.le
- | M.Lt -> h U.lt
- in
- f y1 y2
- | M.Not y ->
- if eval_val c y = U.mql_false then U.mql_true else U.mql_false
- | M.VVar i -> begin
- try List.assoc i c.vvars
- with Not_found -> warn (M.Subj (M.VVar i)); [] end
- | M.Dot i p -> begin
- try List.assoc p (List.assoc i c.groups)
- with Not_found -> warn (M.Subj (M.Dot i p)); [] end
- | M.Proj None x -> List.map (fun (r, _) -> r) (eval_query c x)
- | M.Proj (Some p) x ->
- let proj_group_aux (q, v) = if q = p then v else [] in
- let proj_group a = U.iter proj_group_aux a in
- let proj_set (_, g) = U.iter proj_group g in
- U.iter proj_set (eval_query c x)
+ let proj v = List.map fst v in
+ let rec eval_query c = function
+ | M.Const r -> c, r
+ | M.Dot i p ->
+ begin
+ try c, U.mql_subj (List.assoc p (List.assoc i c.groups))
+ with Not_found -> warn (M.Dot i p); c, []
+ end
| M.Ex l y ->
let rec ex_aux h = function
| [] ->
let d = {c with groups = h} in
- if eval_val d y = U.mql_false then () else raise Found
+ if snd (eval_query d y) = U.mql_false then () else raise Found
| i :: tail ->
begin
try
with Not_found -> ()
end
in
- (try ex_aux [] l; U.mql_false with Found -> U.mql_true)
- | M.StatVal y ->
- let t = P.start_time () in
- let r = (eval_val c y) in
- let s = P.stop_time t in
- C.log h (Printf.sprintf "Stat: %s,%i\n" s (List.length r));
- r
- | M.Count y -> [string_of_int (List.length (eval_val c y))]
- | M.Align s y -> U.iter (U.align s) (eval_val c y)
- and eval_query c = function
- | M.Empty -> []
- | M.Subj x ->
- List.map (fun s -> (s, [])) (eval_val c x)
- | M.Log _ b x ->
- if b then begin
- let t = P.start_time () in
- P.text_of_query (C.log h) x "\n";
- let s = P.stop_time t in
- if C.set h C.Stat then
- C.log h (Printf.sprintf "Log source: %s\n" s);
- eval_query c x
- end else begin
- let s = (eval_query c x) in
- let t = P.start_time () in
- P.text_of_result (C.log h) s "\n";
- let r = P.stop_time t in
- if C.set h C.Stat then
- C.log h (Printf.sprintf "Log: %s\n" r);
- s
+ begin try ex_aux [] l; c, U.mql_false with Found -> c, U.mql_true end
+ | M.SVar i ->
+ begin
+ try c, List.assoc i c.svars
+ with Not_found -> warn (M.SVar i); c, []
+ end
+ | M.AVar i ->
+ begin
+ try c, [List.assoc i c.avars]
+ with Not_found -> warn (M.AVar i); c, []
end
- | M.If y x1 x2 ->
- if (eval_val c y) = U.mql_false
- then (eval_query c x2) else (eval_query c x1)
- | M.Bin k x1 x2 ->
- let f = match k with
- | M.BinFJoin -> U.mql_union
- | M.BinFMeet -> U.mql_intersect
- | M.BinFDiff -> U.mql_diff
- in
- f (eval_query c x1) (eval_query c x2)
- | M.SVar i -> begin
- try List.assoc i c.svars
- with Not_found -> warn (M.SVar i); [] end
- | M.AVar i -> begin
- try [List.assoc i c.avars]
- with Not_found -> warn (M.AVar i); [] end
- | M.LetSVar i x1 x2 ->
- let d = {c with svars = U.set (i, eval_query c x1) c.svars} in
+ | M.Let (Some i) x1 x2 ->
+ let d, r = eval_query c x1 in
+ let d = {d with svars = P.add_assoc (i, r) d.svars} in
eval_query d x2
- | M.LetVVar i y x ->
- let d = {c with vvars = U.set (i, eval_val c y) c.vvars} in
- eval_query d x
+ | M.Let None x1 x2 ->
+ let d, r = eval_query c x1 in eval_query d x2
| M.For k i x1 x2 ->
let f = match k with
| M.GenFJoin -> U.mql_union
| M.GenFMeet -> U.mql_intersect
in
- let rec for_aux = function
- | [] -> []
+ let rec for_aux (d, r) = match r with
+ | [] -> d, []
| h :: t ->
- let d = {c with avars = U.set (i, h) c.avars} in
- f (eval_query d x2) (for_aux t)
+ let d = {d with avars = P.add_assoc (i, h) d.avars} in
+ let d, r = eval_query d x2 in
+ let d, s = for_aux (d, t) in
+ d, f r s
in
for_aux (eval_query c x1)
+ | M.While k x1 x2 ->
+ let f = match k with
+ | M.GenFJoin -> U.mql_union
+ | M.GenFMeet -> U.mql_intersect
+ in
+ let rec while_aux (d, r) =
+ let d, b = eval_query d x1 in
+ if b = U.mql_false then d, r else
+ let d, s = eval_query d x2 in
+ while_aux (d, f r s)
+ in
+ while_aux (c, U.mql_false)
| M.Add b z x ->
let f = if b then U.mql_prod else U.set_union in
let g a s = (fst a, f (snd a) (eval_grp c z)) :: s in
- List.fold_right g (eval_query c x) []
+ let _, r = eval_query c x in
+ c, List.fold_right g r []
| M.Property q0 q1 q2 mc ct cfl el pat y ->
+ let _, r = eval_query c y in
let subj, mct =
- if q0 then [], (pat, q2 @ mc, eval_val c y)
- else (q2 @ mc), (pat, [], eval_val c y)
+ if q0 then [], (pat, q2 @ mc, r) else (q2 @ mc), (pat, [], r)
+ in
+ let eval_cons (pat, p, y) =
+ let _, r = eval_query c y in (pat, q2 @ p, r)
in
- let eval_cons (pat, p, y) = (pat, q2 @ p, eval_val c y) in
let cons_true = mct :: List.map eval_cons ct in
let cons_false = List.map (List.map eval_cons) cfl in
let eval_exp (p, po) = (q2 @ p, po) in
let s = P.stop_time t in
if C.set h C.Stat then
C.log h (Printf.sprintf "Property: %s,%i\n" s (List.length r));
- r
- | M.StatQuery x ->
- let t = P.start_time () in
- let r = (eval_query c x) in
- let s = P.stop_time t in
- C.log h (Printf.sprintf "Stat: %s,%i\n" s (List.length r));
- r
+ c, r
| M.Select i x y ->
- let rec select_aux = function
- | [] -> []
+ let rec select_aux (d, r) = match r with
+ | [] -> d, []
| h :: t ->
- let d = {c with avars = U.set (i, h) c.avars} in
- if eval_val d y = U.mql_false
- then select_aux t else h :: select_aux t
+ let d = {d with avars = P.add_assoc (i, h) d.avars} in
+ let d, r = eval_query d y in
+ let d, s = select_aux (d, t) in
+ if r = U.mql_false then d, s else d, (h :: s)
in
select_aux (eval_query c x)
- | M.Keep b l x ->
- let keep_path (p, v) t =
- if List.mem p l = b then t else (p, v) :: t in
- let keep_grp a = List.fold_right keep_path a [] in
- let keep_set a g =
- let kg = keep_grp a in
- if kg = [] then g else kg :: g
- in
- let keep_av (s, g) = (s, List.fold_right keep_set g []) in
- List.map keep_av (eval_query c x)
+ | M.Fun p pl xl ->
+ let e = {L.eval = (fun x -> snd (eval_query c x)); L.conn = h} in
+ c, L.fun_eval e (F.text_out_spec (C.log h) "\n") F.text_in_spec
+ p pl xl
+ | M.Gen p xl ->
+ let e = {L.eval = (fun x -> snd (eval_query c x)); L.conn = h} in
+ eval_query c (L.gen_eval e p xl)
and eval_grp c = function
| M.Attr gs ->
- let attr_aux g (p, y) = U.mql_union g [(p, eval_val c y)] in
+ let attr_aux g (p, y) =
+ let _, r = eval_query c y in
+ U.mql_union g [p, proj r]
+ in
let attr_auxs s l = U.set_union s [List.fold_left attr_aux [] l] in
List.fold_left attr_auxs [] gs
| M.From i ->
try snd (List.assoc i c.avars)
with Not_found -> warn (M.AVar i); []
in
- let c = {svars = []; avars = []; groups = []; vvars = []} in
+ let c = {svars = []; avars = []; groups = []} in
let t = P.start_time () in
- let r = eval_query c x in
+ let _, r = eval_query c x in
let s = P.stop_time t in
if C.set h C.Stat then
C.log h (Printf.sprintf "MQIExecute: %s,%s\n" s
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