* New operators (Subset, SetEqual and RVarOccurrence) added to MathQL

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

diff --git a/helm/ocaml/mathql_interpreter/mqint.ml b/helm/ocaml/mathql_interpreter/mqint.ml
index c78465aa7c5f315346f9ddfca51a9afde1790f8d..2bf4d144ed18994658ff0ec012d8d7c7e7aa986b 100644 (file)
--- a/helm/ocaml/mathql_interpreter/mqint.ml
+++ b/helm/ocaml/mathql_interpreter/mqint.ml
@@ -60,34 +60,37 @@ let fi_to_string fi =
  *)
 let init () = Dbconn.init ();;
 
-(*
- * esecuzione di una query
- *
- * parametri:
- * q
- *
- * output: string list list; risultato internto formato da uri + contesto.
- *)
-let rec execute_ex q =
- match q with
+(* execute_ex env q                                                   *)
+(*  [env] is the attributed uri environment in which the query [q]    *)
+(*        must be evaluated                                           *)
+(*  [q]   is the query to evaluate                                    *)
+(*  It returns a [Mathql_semantics.result]                            *)
+let rec execute_ex env =
+ function
     MQSelect (apvar, alist, abool) ->
-     select_ex apvar (execute_ex alist) abool
+     select_ex env apvar (execute_ex env alist) abool
  |  MQUsedBy (alist, asvar) ->
-     use_ex (execute_ex alist) asvar "F" (*"refObj"*)
+     use_ex (execute_ex env alist) asvar "F" (*"refObj"*)
  |  MQUse (alist, asvar) ->
-     use_ex (execute_ex alist) asvar "B" (*"backPointer"*)
+     use_ex (execute_ex env alist) asvar "B" (*"backPointer"*)
  |  MQPattern (apreamble, apattern, afragid) ->
      pattern_ex apreamble apattern afragid
  |  MQUnion (l1, l2) ->
-     union_ex (execute_ex l1) (execute_ex l2)
+     union_ex (execute_ex env l1) (execute_ex env l2)
+(*
  |  MQDiff (l1, l2) ->
-     diff_ex (execute_ex l1) (execute_ex l2)
+     diff_ex (execute_ex env l1) (execute_ex env l2)
  |  MQSortedBy (l, o, f) ->
-     sortedby_ex (execute_ex l) o f
+     sortedby_ex (execute_ex env l) o f
+*)
  |  MQIntersect (l1, l2) ->
-     intersect_ex (execute_ex l1) (execute_ex l2)
+     intersect_ex (execute_ex env l1) (execute_ex env l2)
+ |  MQRVarOccur rvar -> [List.assoc rvar env]
 ;;
 
+(* Let's initialize the execute in Select, creating a cyclical recursion *)
+Select.execute := execute_ex;;
+
 (*
  * converte il risultato interno di una query (uri + contesto)
  * in un risultato di sole uri
@@ -119,7 +122,7 @@ let rec execute_ex q =
  * la uri puo' far parte del risultato.
  *)
 let xres_to_res l =
- let tmp = List.map List.hd (List.tl l) in
+ let tmp = List.map (function {Mathql_semantics.uri = uri} -> uri) l in
   MQRefs
    (List.map
     (function l ->
@@ -178,7 +181,7 @@ let xres_to_res l =
  *)
 let execute q =
  match q with
-    MQList qq -> xres_to_res (execute_ex qq)
+    MQList qq -> xres_to_res (execute_ex [] qq)
 ;;
 
 (*