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
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25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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27 */
28
29/** \file
30 * \brief Boundary assertions (^, $, \\A, \\Z, \\z)
31 */
32
33#ifndef _RE_COMPONENTBOUNDARY_H_
34#define _RE_COMPONENTBOUNDARY_H_
35
36#include "Component.h"
37#include "position.h"
38
39namespace ue2 {
40
41/** \brief Encapsulates a line/string boundary assertion. */
42class ComponentBoundary : public Component {
43 friend class DumpVisitor;
44 friend class PrintVisitor;
45 friend class UnsafeBoundsVisitor;
46 friend class MultilineVisitor;
47public:
48 enum Boundary {
49 BEGIN_STRING, //!< beginning of data stream
50 END_STRING, //!< end of data stream
51 END_STRING_OPTIONAL_LF, //!< end of data stream with an optional
52 // linefeed
53 BEGIN_LINE, //!< '(^|\\n)'
54 END_LINE //!< '($|\\n)'
55 };
56
57 explicit ComponentBoundary(enum Boundary bound);
58 ~ComponentBoundary() override;
59 ComponentBoundary *clone() const override;
60
61 Component *accept(ComponentVisitor &v) override {
62 Component *c = v.visit(this);
63 v.post(this);
64 return c;
65 }
66
67 void accept(ConstComponentVisitor &v) const override {
68 v.pre(*this);
69 v.during(*this);
70 v.post(*this);
71 }
72
73 std::vector<PositionInfo> first() const override;
74 std::vector<PositionInfo> last() const override;
75 bool empty() const override;
76 bool repeatable() const override;
77 void notePositions(GlushkovBuildState &bs) override;
78 void buildFollowSet(GlushkovBuildState &bs,
79 const std::vector<PositionInfo> &lastPos) override;
80 bool checkEmbeddedStartAnchor(bool at_start) const override;
81 bool checkEmbeddedEndAnchor(bool at_end) const override;
82
83private:
84 enum Boundary m_bound; //!< \brief which assertion is that?
85 Position m_newline; //!< \brief special newline state
86 std::vector<PositionInfo> m_first; //!< \brief positions returned for first()
87 std::vector<PositionInfo> m_last; //!< \brief positions returned for last()
88
89 ComponentBoundary(const ComponentBoundary &other);
90};
91
92} // namespace ue2
93
94#endif
95