commit of galax mathql interpreter

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

diff --git a/helm/ocaml/mathql_interpreter_galax/diff.ml b/helm/ocaml/mathql_interpreter_galax/diff.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/.
+ *)
+
+(*
+ * implementazione del comando DIFF
+ *)
+
+exception NotCompatible;;
+
+(* intersect_attributes is successful iff there is no attribute with *)
+(* two different values in the two lists. The returned list is the   *)
+(* union of the two lists.                                           *)
+let rec intersect_attributes (attr1, attr2) =
+ match attr1, attr2 with
+    [],_ -> attr2
+  | _,[] -> attr1
+  | (key1,value1)::tl1, (key2,_)::_ when key1 < key2 ->
+      (key1,value1)::(intersect_attributes (tl1,attr2))
+  | (key1,_)::_, (key2,value2)::tl2 when key2 < key1 ->
+      (key2,value2)::(intersect_attributes (attr1,tl2))
+  | entry1::tl1, entry2::tl2 when entry1 = entry2 ->
+     entry1::(intersect_attributes (tl1,tl2))
+  | _, _ -> raise NotCompatible  (* same keys, different values *)
+;;
+
+(*
+ * implementazione del comando DIFF
+ *)
+let rec diff_ex l1 l2 =
+ let module S = Mathql_semantics in
+  match (l1, l2) with
+     [],_ -> []
+   | l,[] -> l
+   | {S.uri = uri1}::_, {S.uri = uri2}::tl2 when uri2 < uri1 ->
+      (diff_ex l1 tl2)
+   | {S.uri = uri1 ; S.attributes = attributes1}::tl1,
+     {S.uri = uri2}::_ when uri1 < uri2 ->
+      {S.uri = uri1 ; S.attributes = attributes1 ; S.extra = ""}::(diff_ex tl1 l2)
+   | {S.uri = uri1 ; S.attributes = attributes1}::tl1,
+     {S.uri = uri2 ; S.attributes = attributes2}::tl2 ->
+       try
+        let attributes' = intersect_attributes (attributes1, attributes2) in 
+         diff_ex tl1 tl2
+       with
+        NotCompatible ->
+         {S.uri = uri1 ; S.attributes = attributes1 ; S.extra = ""}::(diff_ex tl1 tl2)
+;;
+
+let diff_ex l1 l2 =
+ let before = Unix.time () in
+ let res = diff_ex l1 l2 in
+ let after = Unix.time () in
+  let ll1 = string_of_int (List.length l1) in
+  let ll2 = string_of_int (List.length l2) in
+  let diff = string_of_float (after -. before) in
+  prerr_endline
+   ("DIFF(" ^ ll1 ^ ", " ^ ll2 ^ ") = " ^ string_of_int (List.length res) ^
+    ": " ^ diff ^ "s") ;
+  flush stderr ;
+  res
+;;
+