1/*
2 * Copyright (c) 2015-2016, 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
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20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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27 */
28
29/** \file
30 * \brief NFA graph merging ("uncalc")
31 */
32
33#ifndef NG_UNCALC_COMPONENTS_H
34#define NG_UNCALC_COMPONENTS_H
35
36#include <map>
37#include <vector>
38
39namespace ue2 {
40
41struct CompileContext;
42struct Grey;
43class NGHolder;
44class ReportManager;
45
46/**
47 * \brief Returns the common prefix length for a pair of graphs.
48 *
49 * The CPL is calculated based the topological ordering given by the state
50 * indices for each graph.
51 */
52u32 commonPrefixLength(const NGHolder &ga, const NGHolder &gb);
53
54/**
55 * \brief Merge the group of graphs in \p cluster where possible.
56 *
57 * The (from, to) mapping of merged graphs is returned.
58 */
59std::map<NGHolder *, NGHolder *>
60mergeNfaCluster(const std::vector<NGHolder *> &cluster, const ReportManager *rm,
61 const CompileContext &cc);
62
63/**
64 * \brief Merge graph \p ga into graph \p gb.
65 *
66 * Returns false on failure. On success, \p gb is reduced via \ref
67 * reduceImplementableGraph and renumbered.
68 */
69bool mergeNfaPair(const NGHolder &ga, NGHolder &gb, const ReportManager *rm,
70 const CompileContext &cc);
71
72} // namespace ue2
73
74#endif
75