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#ifndef RDFA_H
30#define RDFA_H
31
32#include "nfa_kind.h"
33#include "ue2common.h"
34
35#include "util/flat_containers.h"
36
37#include <array>
38#include <vector>
39
40namespace ue2 {
41
42typedef u16 dstate_id_t;
43typedef u16 symbol_t;
44
45static constexpr symbol_t TOP = 256;
46static constexpr symbol_t ALPHABET_SIZE = 257;
47static constexpr symbol_t N_SPECIAL_SYMBOL = 1;
48static constexpr dstate_id_t DEAD_STATE = 0;
49
50/** Structure representing a dfa state during construction. */
51struct dstate {
52 /** Next state; indexed by remapped sym */
53 std::vector<dstate_id_t> next;
54
55 /** Set by ng_mcclellan, refined by mcclellancompile */
56 dstate_id_t daddy = 0;
57
58 /** Set by mcclellancompile, implementation state id, excludes edge
59 * decorations */
60 dstate_id_t impl_id = 0;
61
62 /** Reports to fire (at any location). */
63 flat_set<ReportID> reports;
64
65 /** Reports to fire (at EOD). */
66 flat_set<ReportID> reports_eod;
67
68 explicit dstate(size_t alphabet_size) : next(alphabet_size, 0) {}
69};
70
71struct raw_dfa {
72 nfa_kind kind;
73 std::vector<dstate> states;
74 dstate_id_t start_anchored = DEAD_STATE;
75 dstate_id_t start_floating = DEAD_STATE;
76 u16 alpha_size = 0; /* including special symbols */
77
78 /* mapping from input symbol --> equiv class id */
79 std::array<u16, ALPHABET_SIZE> alpha_remap;
80
81 explicit raw_dfa(nfa_kind k) : kind(k) {}
82 virtual ~raw_dfa();
83
84 u16 getImplAlphaSize() const { return alpha_size - N_SPECIAL_SYMBOL; }
85 virtual void stripExtraEodReports(void);
86 bool hasEodReports(void) const;
87};
88
89}
90
91#endif
92