adapting SML_Quickcheck to new quickcheck infrastructure

--- a/src/HOL/Library/SML_Quickcheck.thy	Mon Jul 18 10:34:21 2011 +0200
+++ b/src/HOL/Library/SML_Quickcheck.thy	Mon Jul 18 10:34:21 2011 +0200
@@ -5,29 +5,43 @@
 imports Main
 begin
 
-setup {*
+ML {*
+signature SML_QUICKCHECK =
+sig
+  val active : bool Config.T
+  val setup : theory -> theory  
+end;
+
+structure SML_Quickcheck : SML_QUICKCHECK =
+struct
+
+val active = Attrib.setup_config_bool @{binding quickcheck_SML_active} (K true);
+
+fun compile_generator_expr ctxt [(t, eval_terms)] [_, size] =
   let
-    fun compile_generator_expr ctxt [(t, eval_terms)] =
-      let
-        val prop = list_abs_free (Term.add_frees t [], t)
-        val test_fun = Codegen.test_term ctxt prop
-        val iterations = Config.get ctxt Quickcheck.iterations
-        fun iterate size 0 = NONE
-          | iterate size j =
-              let
-                val result = test_fun size handle Match =>
-                  (if Config.get ctxt Quickcheck.quiet then ()
-                   else warning "Exception Match raised during quickcheck"; NONE)
-              in
-                case result of NONE => iterate size (j - 1) | SOME q => SOME q
-              end
-      in fn [_, size] => (iterate size iterations, NONE) end))
-    val test_goals = Quickcheck.generator_test_goal_terms compile_generator_expr
-  in
-    Inductive_Codegen.quickcheck_setup
-    #> Context.theory_map (Quickcheck.add_generator ("SML", compile_generator_expr))
-    #> Context.theory_map (Quickcheck.add_tester ("SML", test_goals))
-  end
+    val prop = list_abs_free (Term.add_frees t [], t)
+    val test_fun = Codegen.test_term ctxt prop
+    val iterations = Config.get ctxt Quickcheck.iterations
+    fun iterate size 0 = NONE
+      | iterate size j =
+          let
+            val result = test_fun size handle Match =>
+              (if Config.get ctxt Quickcheck.quiet then ()
+               else warning "Exception Match raised during quickcheck"; NONE)
+          in
+            case result of NONE => iterate size (j - 1) | SOME q => SOME q
+          end
+  in (iterate size iterations, NONE) end
+
+val test_goals = Quickcheck.generator_test_goal_terms compile_generator_expr
+
+val setup =
+  Inductive_Codegen.quickcheck_setup
+  #> Context.theory_map (Quickcheck.add_tester ("SML", (active, test_goals)))
+
+end;
 *}
 
+setup {* SML_Quickcheck.setup *}
+
 end