-(* 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>
- *)
-
-(* $Id$ *)
-
-module U = MQueryUtil
-
-type pg_map = (MathQL.path * (bool * string * string option)) list
-
-type pg_tables = (bool * string) list
-
-type pg_alias = (string * string) list
-
-let empty_map () = [], []
-
-let read_map () =
- let map = Helm_registry.get "mathql_interpreter.db_map" in
- let ich = open_in map in
- let rec aux r s =
- let d = input_line ich in
- match Str.split (Str.regexp "[ \t]+") d with
- | [] -> aux r s
- | "#" :: _ -> aux r s
- | t :: "<-" :: p -> aux ((p, (false, t, None)) :: r) s
- | t :: c :: "<-" :: p -> aux ((p, (false, t, Some c)) :: r) s
- | t :: "<+" :: p -> aux ((p, (true, t, None)) :: r) s
- | t :: c :: "<+" :: p -> aux ((p, (true, t, Some c)) :: r) s
- | [a; "->"; t] -> aux r ((a, t) :: s)
- | ["->"] -> r, s
- | _ -> raise (Failure "MQIMap.read_map")
- in
- let pgm, pga = aux [] [] in
- close_in ich;
- pgm, pga
-
-let comp c1 c2 = match c1, c2 with
- | (_, t1), (_, t2) when t1 < t2 -> U.Lt
- | (_, t1), (_, t2) when t1 > t2 -> U.Gt
- | (b1, t), (b2, _) -> U.Eq (b1 || b2, t)
-
-let get_tables pgm p =
- let aux l = function
- | q, (b, t, _) when q = p -> U.list_join comp l [(b, t)]
- | _, _ -> l
- in
- List.fold_left aux [] pgm
-
-let rec refine_tables l1 l2 =
- U.list_meet comp l1 l2
-
-let default_table = function
- | [(_, a)] -> a
- | l ->
- try List.assoc true l
- with Not_found -> raise (Failure "MQIMap.default_table")
-
-let get_field pgm p t =
- let aux = function
- | q, (_, u, _) when q = p && u = t -> true
- | _ -> false
- in
- match List.filter aux pgm with
- | [_, (_, _, None)] -> ""
- | [_, (_, _, Some c)] -> c
- | _ -> raise (Failure "MQIMap.get_field")
-
-let resolve pga a =
- try List.assoc a pga with Not_found -> a