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