1 | /* |
2 | * Copyright (c) 2015, 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 | /** \file |
30 | * \brief Lookahead/lookbehind zero-width assertions. |
31 | */ |
32 | |
33 | #ifndef _RE_COMPONENTASSERTION_H_ |
34 | #define _RE_COMPONENTASSERTION_H_ |
35 | |
36 | #include "ComponentSequence.h" |
37 | |
38 | namespace ue2 { |
39 | |
40 | class ComponentAssertion : public ComponentSequence { |
41 | friend class DumpVisitor; |
42 | friend class PrintVisitor; |
43 | public: |
44 | enum Direction { |
45 | LOOKAHEAD, //!< lookahead (forward) assertion |
46 | LOOKBEHIND //!< lookbehind (backward) assertion |
47 | }; |
48 | |
49 | enum Sense { |
50 | POS, //!< positive assertion, (?=...) or (?<=...) |
51 | NEG //!< negative assertion, (?!...) or (?<!...) |
52 | }; |
53 | |
54 | ComponentAssertion(enum Direction dir, enum Sense sense); |
55 | ~ComponentAssertion() override; |
56 | ComponentAssertion *clone() const override; |
57 | Component *accept(ComponentVisitor &v) override; |
58 | void accept(ConstComponentVisitor &v) const override; |
59 | |
60 | std::vector<PositionInfo> first() const override; |
61 | std::vector<PositionInfo> last() const override; |
62 | |
63 | bool empty() const override; |
64 | void notePositions(GlushkovBuildState &bs) override; |
65 | void buildFollowSet(GlushkovBuildState &bs, |
66 | const std::vector<PositionInfo> &lastPos) override; |
67 | bool repeatable() const override; |
68 | |
69 | private: |
70 | enum Direction m_dir; |
71 | enum Sense m_sense; |
72 | }; |
73 | |
74 | } // namespace ue2 |
75 | |
76 | #endif |
77 | |