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