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[helm.git] / helm / ocaml / mathql_interpreter / mQIMap.ml

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-(* 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>
- *)
-
-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 default_map = "mathql_db_map.txt" in
-   let map = 
-      try Sys.getenv "MATHQL_DB_MAP"
-      with Not_found -> default_map 
-   in
-   let ich = open_in map in 
-   let pgs = input_line ich in
-   let rec aux r s =
-      let d = input_line ich in 
-      match Str.split (Str.regexp "[ \t]+") d with
-        | []                  -> aux r s
-        | t ::      "<-" :: p -> aux ((p, (false, t, None)) :: r) s 
-        | t :: c :: "<-" :: p -> aux ((p, (false, t, Some c)) :: 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;
-   pgs, 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