1/*
2 * Copyright (c) 2015-2017, Intel Corporation
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are met:
6 *
7 * * Redistributions of source code must retain the above copyright notice,
8 * this list of conditions and the following disclaimer.
9 * * Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 * * Neither the name of Intel Corporation nor the names of its contributors
13 * may be used to endorse or promote products derived from this software
14 * without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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27 */
28
29/** \file
30 * \brief Functions for splitting NFAGraphs into LHS and RHS.
31 */
32
33#ifndef NG_SPLIT_H
34#define NG_SPLIT_H
35
36#include "ng_holder.h"
37
38#include <unordered_map>
39#include <vector>
40
41namespace ue2 {
42
43class NGHolder;
44
45/** Note: pivot should be a vertex that dominates acceptEod. Treating 'in'
46 * allocated to rhs if they are reachable from the pivot. Conversely, a vertex
47 * is in the lhs if it is reachable from start without going through the
48 * pivot. The pivot ends up in the LHS and any adjacent vertices in the RHS.
49 *
50 * Note: The RHS is setup to be triggered by TOP 0
51 *
52 * When multiple split vertices are provided:
53 * - RHS contains all vertices reachable from every pivot
54 * - LHS contains all vertices which are reachable from start ignoring any
55 * vertices which have an edge to every pivot
56 */
57void splitGraph(const NGHolder &base, NFAVertex pivot, NGHolder *lhs,
58 std::unordered_map<NFAVertex, NFAVertex> *lhs_map,
59 NGHolder *rhs,
60 std::unordered_map<NFAVertex, NFAVertex> *rhs_map);
61
62void splitGraph(const NGHolder &base, const std::vector<NFAVertex> &pivots,
63 NGHolder *lhs,
64 std::unordered_map<NFAVertex, NFAVertex> *lhs_map,
65 NGHolder *rhs,
66 std::unordered_map<NFAVertex, NFAVertex> *rhs_map);
67
68void splitLHS(const NGHolder &base, NFAVertex pivot, NGHolder *lhs,
69 std::unordered_map<NFAVertex, NFAVertex> *lhs_map);
70
71void splitRHS(const NGHolder &base, const std::vector<NFAVertex> &pivots,
72 NGHolder *rhs, std::unordered_map<NFAVertex, NFAVertex> *rhs_map);
73
74} // namespace ue2
75
76#endif // NG_SPLIT_H
77