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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 Functions for splitting NFAGraphs into LHS and RHS.
*/
#ifndef NG_SPLIT_H
#define NG_SPLIT_H
#include "ng_holder.h"
#include <unordered_map>
#include <vector>
namespace ue2 {
class NGHolder;
/** Note: pivot should be a vertex that dominates acceptEod. Treating 'in'
* allocated to rhs if they are reachable from the pivot. Conversely, a vertex
* is in the lhs if it is reachable from start without going through the
* pivot. The pivot ends up in the LHS and any adjacent vertices in the RHS.
*
* Note: The RHS is setup to be triggered by TOP 0
*
* When multiple split vertices are provided:
* - RHS contains all vertices reachable from every pivot
* - LHS contains all vertices which are reachable from start ignoring any
* vertices which have an edge to every pivot
*/
void splitGraph(const NGHolder &base, NFAVertex pivot, NGHolder *lhs,
std::unordered_map<NFAVertex, NFAVertex> *lhs_map,
NGHolder *rhs,
std::unordered_map<NFAVertex, NFAVertex> *rhs_map);
void splitGraph(const NGHolder &base, const std::vector<NFAVertex> &pivots,
NGHolder *lhs,
std::unordered_map<NFAVertex, NFAVertex> *lhs_map,
NGHolder *rhs,
std::unordered_map<NFAVertex, NFAVertex> *rhs_map);
void splitLHS(const NGHolder &base, NFAVertex pivot, NGHolder *lhs,
std::unordered_map<NFAVertex, NFAVertex> *lhs_map);
void splitRHS(const NGHolder &base, const std::vector<NFAVertex> &pivots,
NGHolder *rhs, std::unordered_map<NFAVertex, NFAVertex> *rhs_map);
} // namespace ue2
#endif // NG_SPLIT_H
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