commit of galax mathql interpreter

[helm.git] / helm / ocaml / mathql_interpreter_galax / select.ml

diff --git a/helm/ocaml/mathql_interpreter_galax/select.ml b/helm/ocaml/mathql_interpreter_galax/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;;
+
+
+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
+prerr_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 stderr ;
+        (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
+prerr_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 stderr ;
+        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 = Unix.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 (Unix.time () -. t) ^ "s") ;
+   flush stdout ;
+   result
+;;
+
+