1 (* Copyright (C) 2000, HELM Team.
3 * This file is part of HELM, an Hypertextual, Electronic
4 * Library of Mathematics, developed at the Computer Science
5 * Department, University of Bologna, Italy.
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8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version 2
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14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
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19 * Foundation, Inc., 59 Temple Place - Suite 330, Boston,
22 * For details, see the HELM World-Wide-Web page,
23 * http://cs.unibo.it/helm/.
27 * implementazione dei comandi USE/USED BY
34 * implementazione dei comandi USE/USED BY
37 * alist: string list list; lista su cui eseguire il comando USE/USED BY
38 * asvar: string; nome della variabile del comando use
39 * usek: string; nome della tabella in cui ricercare le occorrenze;
40 * la distinzione fra l'esecuzione del comando USE e USED BY
41 * sta nell'utilizzo della tabella 'backPointer' per USE
42 * e 'refObj' per USED BY
44 * output: string list list; lista su cui e' stato eseguito il
47 let use_ex alist asvar usek =
51 let r1 = helm_property_id usek
52 and r2 = helm_property_id "position"
53 and r3 = helm_property_id "occurrence"
55 let qq = "select distinct t" ^ r3 ^ ".att1, t" ^ r2 ^ ".att1 " ^
56 "from t" ^ r3 ^ ", t" ^ r2 ^ ", t" ^ r1 ^ " " ^
57 "where " ^ "t" ^ r1 ^ ".att0 = '" ^ (List.hd xres) ^ "' and t" ^ r1 ^
58 ".att1 = t" ^ r2 ^ ".att0 and t" ^ r1 ^ ".att1 = t" ^ r3 ^
61 (*let _ = print_endline ("use: " ^ qq) in*)
62 let res = c#exec qq in
65 if not (List.mem asvar (List.tl (List.hd alist))) then
67 (fun l -> [List.hd l] @ List.tl xres @ List.tl l)
74 hd::tl -> (List.hd l)::tl
82 (List.combine (List.hd alist) t)
94 (List.tl (List.hd alist))
100 xresv = "" or xresv = currv
107 if not (List.mem asvar (List.tl (List.hd alist))) then