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
24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 */
28
29/**
30 * \file
31 * \brief NFA graph vertex depth calculations.
32 */
33
34#ifndef NG_DEPTH_H
35#define NG_DEPTH_H
36
37#include "ue2common.h"
38#include "nfagraph/ng_holder.h"
39#include "util/depth.h"
40
41#include <vector>
42
43namespace ue2 {
44
45/**
46 * \brief Encapsulates min/max depths relative to the start and startDs
47 * vertices.
48 */
49struct NFAVertexDepth {
50 DepthMinMax fromStart;
51 DepthMinMax fromStartDotStar;
52};
53
54/**
55 * \brief Encapsulates min/max depths relative to the accept and acceptEod
56 * vertices.
57 */
58struct NFAVertexRevDepth {
59 DepthMinMax toAccept;
60 DepthMinMax toAcceptEod;
61};
62
63/**
64 * \brief Encapsulates min/max depths relative to all of our special vertices.
65 */
66struct NFAVertexBidiDepth {
67 DepthMinMax fromStart;
68 DepthMinMax fromStartDotStar;
69 DepthMinMax toAccept;
70 DepthMinMax toAcceptEod;
71};
72
73/**
74 * \brief Calculate depths from start and startDs. Returns them in a vector,
75 * indexed by vertex index.
76 */
77std::vector<NFAVertexDepth> calcDepths(const NGHolder &g);
78
79/**
80 * \brief Calculate depths to accept and acceptEod. Returns them in a vector,
81 * indexed by vertex index.
82 */
83std::vector<NFAVertexRevDepth> calcRevDepths(const NGHolder &g);
84
85/**
86 * \brief Calculate depths to/from all special vertices. Returns them in a
87 * vector, indexed by vertex index.
88 */
89std::vector<NFAVertexBidiDepth> calcBidiDepths(const NGHolder &g);
90
91/**
92 * \brief Calculate the (min, max) depths from the given \p src to every vertex
93 * in the graph and return them in a vector, indexed by \p vertex_index.
94 */
95std::vector<DepthMinMax> calcDepthsFrom(const NGHolder &g, const NFAVertex src);
96
97} // namespace ue2
98
99#endif // NG_DEPTH_H
100