+++ /dev/null
-(* Copyright (C) 2000, HELM Team.
- *
- * This file is part of HELM, an Hypertextual, Electronic
- * Library of Mathematics, developed at the Computer Science
- * Department, University of Bologna, Italy.
- *
- * HELM is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * HELM is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with HELM; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston,
- * MA 02111-1307, USA.
- *
- * For details, see the HELM World-Wide-Web page,
- * http://cs.unibo.it/helm/.
- *)
-
-(* AUTOR: Ferruccio Guidi <fguidi@cs.unibo.it>
- *)
-
-(* contexts *****************************************************************)
-
-type svar_context = (MathQL.svar * MathQL.resource_set) list
-
-type avar_context = (MathQL.avar * MathQL.resource) list
-
-type group_context = (MathQL.avar * MathQL.attribute_group) list
-
-type vvar_context = (MathQL.vvar * MathQL.value) list
-
-type context = {svars: svar_context;
- avars: avar_context;
- groups: group_context; (* auxiliary context *)
- vvars: vvar_context
- }
-
-(* execute *****************************************************************)
-
-exception Found
-
-module M = MathQL
-module P = MQueryUtil
-module C = MQIConn
-module U = MQIUtil
-
-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) "\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)
- | 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
- | i :: tail ->
- begin
- try
- let (_, a) = List.assoc i c.avars in
- let rec add_group = function
- | [] -> ()
- | g :: t -> ex_aux ((i, g) :: h) tail; add_group t
- in
- add_group a
- 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) "\n" x;
- let s = P.stop_time t in
- if C.set h C.Times 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) "\n" s;
- let r = P.stop_time t in
- if C.set h C.Times then
- C.log h (Printf.sprintf "Log: %s\n" r);
- s
- 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
- 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.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
- | [] -> []
- | h :: t ->
- let d = {c with avars = U.set (i, h) c.avars} in
- f (eval_query d x2) (for_aux t)
- in
- for_aux (eval_query c x1)
- | 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) []
- | M.Property (q0,q1,q2,mc,ct,cfl,el,pat,y) ->
- let subj, mct =
- if q0 then [], (pat, q2 @ mc, eval_val c y)
- else (q2 @ mc), (pat, [], eval_val c y)
- 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 exp = List.map eval_exp el in
- let t = P.start_time () in
- let r = MQIProperty.exec h q1 subj cons_true cons_false exp in
- let s = P.stop_time t in
- if C.set h C.Times 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
- | M.Select (i,x,y) ->
- let rec select_aux = function
- | [] -> []
- | 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
- 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)
- 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_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 t = P.start_time () in
- if C.set h C.Source then P.text_of_query (C.log h) "\n" x;
- let r = eval_query c x in
- if C.set h C.Result then P.text_of_result (C.log h) "\n" r;
- let s = P.stop_time t in
- if C.set h C.Times then
- C.log h (Printf.sprintf "MQIExecute: %s,%s\n" s
- (C.string_of_flags (C.flags h)));
- r
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