1/*
2 * Copyright (C) 2013, Opera Software ASA. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are
6 * met:
7 *
8 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * * Redistributions in binary form must reproduce the above
11 * copyright notice, this list of conditions and the following disclaimer
12 * in the documentation and/or other materials provided with the
13 * distribution.
14 * * Neither the name of Google Inc. nor the names of its
15 * contributors may be used to endorse or promote products derived from
16 * this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31#pragma once
32
33#include "SegmentedString.h"
34#include <wtf/text/StringBuilder.h>
35
36namespace WebCore {
37
38// Line collection helper for the WebVTT Parser.
39//
40// Converts a stream of data (== a sequence of Strings) into a set of
41// lines. CR, LR or CRLF are considered line breaks. Normalizes NULs (U+0000)
42// to 'REPLACEMENT CHARACTER' (U+FFFD) and does not return the line breaks as
43// part of the result.
44class BufferedLineReader {
45 WTF_MAKE_NONCOPYABLE(BufferedLineReader);
46public:
47 BufferedLineReader() = default;
48 void reset();
49
50 void append(String&& data)
51 {
52 ASSERT(!m_endOfStream);
53 m_buffer.append(WTFMove(data));
54 }
55
56 void appendEndOfStream() { m_endOfStream = true; }
57 bool isAtEndOfStream() const { return m_endOfStream && m_buffer.isEmpty(); }
58
59 Optional<String> nextLine();
60
61private:
62 SegmentedString m_buffer;
63 StringBuilder m_lineBuffer;
64 bool m_endOfStream { false };
65 bool m_maybeSkipLF { false };
66};
67
68inline void BufferedLineReader::reset()
69{
70 m_buffer.clear();
71 m_lineBuffer.clear();
72 m_endOfStream = false;
73 m_maybeSkipLF = false;
74}
75
76} // namespace WebCore
77