1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
|
/*
* Copyright (c) 2015, 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 Lookahead/lookbehind zero-width assertions.
*/
#ifndef _RE_COMPONENTASSERTION_H_
#define _RE_COMPONENTASSERTION_H_
#include "ComponentSequence.h"
namespace ue2 {
class ComponentAssertion : public ComponentSequence {
friend class DumpVisitor;
friend class PrintVisitor;
public:
enum Direction {
LOOKAHEAD, //!< lookahead (forward) assertion
LOOKBEHIND //!< lookbehind (backward) assertion
};
enum Sense {
POS, //!< positive assertion, (?=...) or (?<=...)
NEG //!< negative assertion, (?!...) or (?<!...)
};
ComponentAssertion(enum Direction dir, enum Sense sense);
~ComponentAssertion() override;
ComponentAssertion *clone() const override;
Component *accept(ComponentVisitor &v) override;
void accept(ConstComponentVisitor &v) const override;
std::vector<PositionInfo> first() const override;
std::vector<PositionInfo> last() const override;
bool empty() const override;
void notePositions(GlushkovBuildState &bs) override;
void buildFollowSet(GlushkovBuildState &bs,
const std::vector<PositionInfo> &lastPos) override;
bool repeatable() const override;
private:
enum Direction m_dir;
enum Sense m_sense;
};
} // namespace ue2
#endif
|
