This commit was manufactured by cvs2svn to create branch 'init'.

[helm.git] / helm / ocaml / mathql_interpreter / select.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://www.cs.unibo.it/helm/.
- *)
-
-(*
- * implementazione del comando SELECT
- *)
-(*
-open MathQL;;
-open Func;;
-open Utility;;
-
-exception ExecuteFunctionNotInitialized;;
-let execute =
- ref
-  (function _ -> raise ExecuteFunctionNotInitialized)
-;;
-
-(*
- * valutazione di una stringa
- *)
-let stringeval env =
- let module S = Mathql_semantics in
-  function
-     MQCons s ->
-      s
-  |  MQFunc (f, rvar) ->
-      let {S.uri = uri} = List.assoc rvar env in
-       apply_func f uri
-  |  MQStringRVar rvar ->
-      let {S.uri = uri} = List.assoc rvar env in
-       uri
-  |  MQStringSVar svar ->
-      let (_,{S.attributes = attributes}) = List.hd env in
-       List.assoc svar attributes
-  |  MQMConclusion ->
-      "MainConclusion"
-  |  MQConclusion ->
-      "InConclusion"
-;;
-
-(*
- *
- *)
-let rec is_good env =
- let module S = Mathql_semantics in
-  function
-     MQAnd (b1, b2) ->
-      (is_good env b1) && (is_good env b2)
-  |  MQOr (b1, b2) ->
-      (is_good env b1) || (is_good env b2)
-  |  MQNot b1 ->
-      not (is_good env b1)
-  |  MQTrue ->
-      true
-  |  MQFalse ->
-      false
-  |  MQIs (s1, s2) ->
-      (stringeval env s1) = (stringeval env s2)
-(*CSC: magari le prossime funzioni dovrebbero  andare in un file a parte, *)
-(*CSC: insieme alla [execute] che utilizzano                              *)
-  |  MQSetEqual (q1,q2) ->
-      (* set_of_result returns an ordered list of uris without duplicates *)
-      let rec set_of_result =
-       function
-          _,[] -> []
-        | (Some olduri as v),{S.uri = uri}::tl when uri = olduri ->
-            set_of_result (v,tl)
-        | _,{S.uri = uri}::tl ->
-            uri::(set_of_result (Some uri, tl))
-      in
-       let ul1 = set_of_result (None,!execute env q1) in
-       let ul2 = set_of_result (None,!execute env q2) in
-       print_endline ("MQSETEQUAL(" ^ 
-           string_of_int (List.length (!execute env q1)) ^ ">" ^
-          string_of_int (List.length ul1) ^ "," ^
-          string_of_int (List.length (!execute env q2)) ^ ">" ^
-          string_of_int (List.length ul2) ^ ")") ;
-       flush stdout ;
-        (try
-          List.fold_left2 (fun b uri1 uri2 -> b && uri1=uri2) true ul1 ul2
-         with
-          _ -> false)
-  |  MQSubset (q1,q2) ->
-(*CSC: codice cut&paste da sopra: ridurlo facendo un'unica funzione h.o. *)
-      (* set_of_result returns an ordered list of uris without duplicates *)
-      let rec set_of_result =
-       function
-          _,[] -> []
-        | (Some olduri as v),{S.uri = uri}::tl when uri = olduri ->
-            set_of_result (v,tl)
-        | _,{S.uri = uri}::tl ->
-            uri::(set_of_result (Some uri, tl))
-      in
-       let ul1 = set_of_result (None,!execute env q1) in
-       let ul2 = set_of_result (None,!execute env q2) in
-        print_endline ("MQSUBSET(" ^ 
-       string_of_int (List.length (!execute env q1)) ^ ">" ^
-       string_of_int (List.length ul1) ^ "," ^
-       string_of_int (List.length (!execute env q2)) ^ ">" ^
-       string_of_int (List.length ul2) ^ ")") ;
-       flush stdout ;
-        let rec is_subset s1 s2 =
-         match s1,s2 with
-            [],_ -> true
-          | _,[] -> false
-          | uri1::tl1,uri2::tl2 when uri1 = uri2 ->
-             is_subset tl1 tl2
-          | uri1::_,uri2::tl2 when uri1 > uri2 ->
-             is_subset s1 tl2
-          | _,_ -> false
-        in
-         is_subset ul1 ul2
-;;
-
-(*
- * implementazione del comando SELECT
- *)
-let select_ex env avar alist abool =
- let _ = print_string ("SELECT = ")
- and t = Sys.time () in
-  let result = 
-   List.filter (function entry -> is_good ((avar,entry)::env) abool) alist
-  in
-   print_string (string_of_int (List.length result) ^ ": ") ;
-   print_endline (string_of_float (Sys.time () -. t) ^ "s") ;
-   flush stdout ;
-   result
-;; *)
-
-let select_ex rvar rset bexp
-