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 Alternations (foo|bar|baz).
31 */
32
33#ifndef COMPONENT_ALTERNATION_H
34#define COMPONENT_ALTERNATION_H
35
36#include "Component.h"
37#include "position.h"
38
39#include <memory>
40
41namespace ue2 {
42
43class PositionInfo;
44
45class ComponentAlternation : public Component {
46 friend class DumpVisitor;
47 friend class SimplifyVisitor;
48public:
49 ComponentAlternation();
50 ~ComponentAlternation() override;
51 ComponentAlternation *clone() const override;
52 Component *accept(ComponentVisitor &v) override;
53 void accept(ConstComponentVisitor &v) const override;
54
55 size_t numBranches() const { return children.size(); }
56
57 void append(std::unique_ptr<Component> component);
58
59 std::vector<PositionInfo> first() const override;
60 std::vector<PositionInfo> last() const override;
61 bool empty(void) const override;
62 bool vacuous_everywhere() const override;
63 void notePositions(GlushkovBuildState &bs) override;
64 void buildFollowSet(GlushkovBuildState &bs,
65 const std::vector<PositionInfo> &lastPos) override;
66 bool checkEmbeddedStartAnchor(bool at_start) const override;
67 bool checkEmbeddedEndAnchor(bool at_end) const override;
68
69 void optimise(bool connected_to_sds) override;
70
71private:
72 std::vector<std::unique_ptr<Component>> children;
73
74 ComponentAlternation(const ComponentAlternation &other);
75};
76
77} // namespace ue2
78
79#endif
80