more ML API

Signed-off-by: Christoph M. Wintersteiger <cwinter@microsoft.com>

src/api/ml/z3.ml

@@ -23,48 +23,42 @@ end
 class context settings  =
 object (self)
   inherit idisposable
-  val mutable m_n_ctx : Z3native.z3_context option = None
+
+  val mutable m_n_ctx : Z3native.z3_context = 
+    let cfg = mk_config() in
+    let f e = (set_param_value cfg (fst e) (snd e)) in
+    (List.iter f settings) ;
+    let v = mk_context_rc cfg in
+    del_config(cfg) ;
+    v
+
   val mutable m_refCount : int = 0
     
-  initializer 
+  initializer Gc.finalise (fun self -> self#dispose) self
-  let cfg = mk_config() in
-  (match settings with
-    | Some(x) -> 
-      let f e = (set_param_value cfg (fst e) (snd e)) in
-      (List.iter f x)
-    | _ -> ()	    
-  ) ;
-  m_n_ctx <- Some (mk_context_rc cfg) ;
-  del_config(cfg) ;
-  Gc.finalise (fun self -> self#dispose) self
     
   method dispose : unit = 
     if m_refCount == 0 then (
       Printf.printf "Disposing %d \n" (Oo.id self) ;
-      match m_n_ctx with
+      (del_context m_n_ctx)
-	| Some(x) -> (del_context x)
-	| None -> ()
     ) else (
        (* re-queue for finalization? *)
     )
 
   method sub_one_ctx_obj = m_refCount <- m_refCount - 1
   method add_one_ctx_obj = m_refCount <- m_refCount + 1
+  method get_native = m_n_ctx
 end
 
 class virtual z3object ctx_init obj_init =
 object (self)
   inherit idisposable
-  val mutable m_ctx : context option = ctx_init
+  val mutable m_ctx : context = ctx_init
   val mutable m_n_obj : Z3native.ptr option = obj_init
     
   initializer 
     (match m_n_obj with 
       | Some (x) -> self#incref x;
-	(match m_ctx with
+	m_ctx#add_one_ctx_obj
-	  | Some(x) -> x#add_one_ctx_obj
-	  | None -> ()
-	)
       | None -> ()
     );
     Gc.finalise (fun self -> self#dispose) self
@@ -78,15 +72,9 @@ object (self)
   method dispose =
     Printf.printf "Disposing z3object %d \n" (Oo.id self) ;
     (match m_n_obj with
-      | Some (x) -> self#decref x; m_n_obj <- None
+      | Some (x) -> self#decref x; m_n_obj <- None; m_ctx#sub_one_ctx_obj
       | None -> ()
     ); 
-    (match m_ctx with
-      | Some (x) -> x#sub_one_ctx_obj
-      | None -> ()
-    );
-    m_ctx <- None
-
 
   method get_native_object = m_n_obj
 
@@ -102,6 +90,7 @@ object (self)
     m_n_obj <- x
 
   method get_context = m_ctx
+  method get_native_context = m_ctx#get_native
 
   (*
     method array_to_native a =
@@ -113,6 +102,57 @@ object (self)
     | Some(x) -> (Array.length x)
     | None -> 0
   *)
+end
+
+class symbol ctx_init obj_init = 
+object (self)
+  inherit z3object ctx_init obj_init
+
+  method incref o = ()
+  method decref o = ()
+
+  method kind = match m_n_obj with
+    | Some(x) -> (int2symbol_kind (get_symbol_kind self#get_native_context x))
+    | _ -> raise (Exception "Underlying object lost")
+
+  method is_int_symbol = match m_n_obj with
+    | Some(x) -> self#kind == INT_SYMBOL
+    | _ -> false
+
+  method is_string_symbol = match m_n_obj with
+    | Some(x) -> self#kind == STRING_SYMBOL
+    | _ -> false
+
+  method to_string = match m_n_obj with
+    | Some(x) -> 
+      (
+	match self#kind with
+	  | INT_SYMBOL -> (string_of_int (get_symbol_int self#get_native_context x))
+	  | STRING_SYMBOL -> (get_symbol_string self#get_native_context x)
+      )
+    | None -> ""
+
+  method create ctx obj =
+    match obj with 
+      | Some(x) -> (
+	match (int2symbol_kind (get_symbol_kind ctx#get_native x)) with
+	  | INT_SYMBOL -> (new intsymbol ctx obj :> symbol)
+          | STRING_SYMBOL -> (new stringsymbol ctx obj :> symbol)
+      )
+      | None -> raise (Exception "Can't create null objects")
 
 end
 
+and intsymbol ctx_init obj_init  = 
+object(self)
+  inherit symbol ctx_init obj_init
+
+  method get_int = match m_n_obj with
+    | Some(x) -> (get_symbol_int m_ctx#get_native x)
+    | None -> 0
+end
+
+and stringsymbol ctx_init obj_init = 
+object(self)
+  inherit symbol ctx_init obj_init
+end