working on scale transformation

Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>

src/muz_qe/dl_mk_scale.h

@@ -0,0 +1,47 @@
+/*++
+Copyright (c) 2013 Microsoft Corporation
+
+Module Name:
+
+    dl_mk_scale.h
+
+Abstract:
+
+    Add scale factor to linear (Real) arithemetic Horn clauses.
+    The transformation replaces occurrences of isolated constants by
+    a scale multiplied to each constant. 
+
+Author:
+
+    Nikolaj Bjorner (nbjorner) 2013-08-19
+
+Revision History:
+
+--*/
+#ifndef _DL_MK_SCALE_H_
+#define _DL_MK_SCALE_H_
+
+#include"dl_rule_transformer.h"
+#include"arith_decl_plugin.h"
+
+namespace datalog {
+
+    class mk_scale : public rule_transformer::plugin {
+        ast_manager& m;
+        context&     m_ctx;
+        arith_util   a;
+        expr_ref_vector m_trail;
+        obj_map<expr, expr*> m_cache;
+        expr*       linearize(unsigned num_vars, expr* e);
+        app_ref      mk_pred(unsigned num_vars, app* q);
+        app_ref      mk_constraint(unsigned num_vars, app* q);
+    public:
+        mk_scale(context & ctx, unsigned priority = 33039);
+        ~mk_scale();        
+        rule_set * operator()(rule_set const & source);
+    };
+
+};
+
+#endif /* _DL_MK_SCALE_H_ */
+