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99 lines
3.7 KiB
C++
99 lines
3.7 KiB
C++
/*
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* Copyright (c) 2015-2017, Intel Corporation
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of Intel Corporation nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/** \file
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* \brief Literal analysis and scoring.
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*/
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#ifndef NG_LITERAL_ANALYSIS_H
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#define NG_LITERAL_ANALYSIS_H
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#include <set>
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#include <vector>
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#include "ng_holder.h"
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#include "util/ue2string.h"
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namespace ue2 {
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#define NO_LITERAL_AT_EDGE_SCORE 10000000ULL
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#define INVALID_EDGE_CAP 100000000ULL /* special-to-special score */
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class NGHolder;
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/**
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* Fetch the literal set for a given vertex, returning it in \p s. Note: does
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* NOT take into account any constraints due to streaming mode requirements.
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*
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* if only_first_encounter is requested, the output set may drop literals
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* generated by revisiting the destination vertex.
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*/
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std::set<ue2_literal> getLiteralSet(const NGHolder &g, const NFAVertex &v,
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bool only_first_encounter = true);
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std::set<ue2_literal> getLiteralSet(const NGHolder &g, const NFAEdge &e);
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/**
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* Returns true if we are unable to use a mixed sensitivity literal in rose (as
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* our literal matchers are generally either case sensitive or not).
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*
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* Shortish mixed sensitivity literals can be handled by confirm checks in rose
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* and are not flagged as bad.
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*/
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bool bad_mixed_sensitivity(const ue2_literal &s);
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/**
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* Score all the edges in the given graph, returning them in \p scores indexed
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* by edge_index. */
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std::vector<u64a> scoreEdges(const NGHolder &h,
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const flat_set<NFAEdge> &known_bad = flat_set<NFAEdge>());
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/** Returns a score for a literal set. Lower scores are better. */
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u64a scoreSet(const std::set<ue2_literal> &s);
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/** Compress a literal set to fewer literals. */
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u64a compressAndScore(std::set<ue2_literal> &s);
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/**
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* Compress a literal set to fewer literals and replace any long mixed
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* sensitivity literals with supported literals.
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*/
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u64a sanitizeAndCompressAndScore(std::set<ue2_literal> &s);
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bool splitOffLeadingLiteral(const NGHolder &g, ue2_literal *lit_out,
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NGHolder *rhs);
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bool getTrailingLiteral(const NGHolder &g, ue2_literal *lit_out);
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/** \brief Returns true if the given literal is the only thing in the graph,
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* from (start or startDs) to accept. */
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bool literalIsWholeGraph(const NGHolder &g, const ue2_literal &lit);
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} // namespace ue2
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#endif
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