Z3 sources

Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>

lib/dl_mk_similarity_compressor.h

@@ -0,0 +1,78 @@
+/*++
+Copyright (c) 2006 Microsoft Corporation
+
+Module Name:
+
+    dl_mk_similarity_compressor.h
+
+Abstract:
+
+    <abstract>
+
+Author:
+
+    Krystof Hoder (t-khoder) 2010-10-22.
+
+Revision History:
+
+--*/
+#ifndef _DL_MK_SIMILARITY_COMPRESSOR_H_
+#define _DL_MK_SIMILARITY_COMPRESSOR_H_
+
+#include<utility>
+
+#include"map.h"
+#include"obj_pair_hashtable.h"
+
+#include"dl_context.h"
+#include"dl_rule_set.h"
+#include"dl_rule_transformer.h"
+
+namespace datalog {
+
+    /**
+       \brief Functor for merging groups of similar rules.
+
+       A rule sequence
+       
+       P("1",x):-Q(x).
+       ...
+       P("N",x):-Q(x).
+
+       will be replaced by
+       
+       P(y,x):-Q(x), Aux(y).
+       
+       and a set of facts
+
+       Aux("1").
+       ...
+       Aux("N").
+
+       Similar transformation is performed when the varying constant appears in the positive tail.
+    */
+    class mk_similarity_compressor : public rule_transformer::plugin {
+
+        context &			m_context;
+        ast_manager &       m_manager;
+        /** number of similar rules necessary for a group to be introduced */
+        unsigned            m_threshold_count;
+        rule_vector         m_rules;
+        rule_ref_vector     m_result_rules;
+        bool                m_modified;
+        ast_ref_vector      m_pinned;
+        
+        void merge_class(rule_vector::iterator first, rule_vector::iterator after_last);
+        void process_class(rule_vector::iterator first, rule_vector::iterator after_last);
+
+        void reset();
+    public:
+        mk_similarity_compressor(context & ctx, unsigned threshold_count);
+        
+        rule_set * operator()(rule_set const & source, model_converter_ref& mc, proof_converter_ref& pc);
+    };
+
+};
+
+#endif /* _DL_MK_SIMILARITY_COMPRESSOR_H_ */
+