commit of galax mathql interpreter

[helm.git] / helm / ocaml / mathql_interpreter_galax / eval.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/.
+ *)
+
+(*
+ *
+ *)
+
+open MathQL;;
+
+(*
+ * conversione di un pattern
+ *)
+let rec patterneval p =
+ match p with
+   [] -> ""
+ | head::tail ->
+    let h = match head with
+               MQBC s -> Str.global_replace (Str.regexp "\.") "\\\\\." s
+            |  MQBD -> "/"
+            |  MQBQ -> "[^/#]?"
+            |  MQBS -> "[^/#]*"
+            |  MQBSS -> "[^#]*"
+    in
+     h ^ (patterneval tail)
+;;
+
+let rec fieval fi =
+ match fi with
+    [] -> ""
+  | MQFC i :: tail -> "/" ^ (string_of_int i) ^ (fieval tail)
+  | MQFS :: tail -> "[^/]*" ^ (fieval tail)
+  | MQFSS :: tail -> ".*"  ^ (fieval tail)
+;;
+
+(*
+ * conversione di un fragment identifier
+ *)
+let fieval fi =
+ if fi = [] then
+  ""
+ else
+  "#xpointer\\\\(1" ^ fieval fi ^ "\\\\)"
+;;
+
+(*
+ * valuta l'estensione
+ *
+ * 20/05/2002: non piu' necessario: l'estensione fa eventualmente
+ * parte del pattern precedente
+ *)
+let exteval ext =
+ match ext with
+    "" -> ""
+ |  _  -> ("\." ^ ext)
+;;
+
+(*
+ * valuta il preambolo
+ *)
+let preeval p =
+ match p with 
+    Some s -> s
+  | None -> "[^/]*"
+;;
+
+(*
+ * trasforma un pattern MathQL in un pattern postgresql
+ *
+ * si utilizzano espressioni regolari POSIX anziche' l'operatore
+ * SQL standard LIKE perche' MathQL prevede esperssioni con "*"
+ * e con "**".
+ *)
+let pattern_match (preamble, pattern, fragid) =
+ " ~ '^" ^ (preeval preamble) ^ ":/" ^ (patterneval pattern) ^ (fieval fragid) ^ "$'"
+;;
+