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
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
|
/*
* Copyright (C) 2011 Google Inc. All rights reserved.
*
* 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 Google Inc. 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.
*/
#ifndef WebVTTTokenizer_h
#define WebVTTTokenizer_h
#if ENABLE(VIDEO_TRACK)
#include "InputStreamPreprocessor.h"
#include "WebVTTToken.h"
#include <wtf/PassOwnPtr.h>
namespace WebCore {
class WebVTTTokenizerState {
public:
enum State {
DataState,
EscapeState,
TagState,
StartTagState,
StartTagClassState,
StartTagAnnotationState,
EndTagState,
EndTagOpenState,
TimestampTagState,
};
};
class WebVTTTokenizer {
WTF_MAKE_NONCOPYABLE(WebVTTTokenizer);
WTF_MAKE_FAST_ALLOCATED;
public:
static PassOwnPtr<WebVTTTokenizer> create() { return adoptPtr(new WebVTTTokenizer); }
typedef WebVTTTokenizerState State;
void reset();
bool nextToken(SegmentedString&, WebVTTToken&);
inline bool haveBufferedCharacterToken()
{
return m_token->type() == WebVTTToken::Type::Character;
}
inline void bufferCharacter(UChar character)
{
ASSERT(character != kEndOfFileMarker);
m_token->ensureIsCharacterToken();
m_token->appendToCharacter(character);
}
inline bool emitAndResumeIn(SegmentedString& source, State::State state)
{
m_state = state;
source.advanceAndUpdateLineNumber();
return true;
}
inline bool emitEndOfFile(SegmentedString& source)
{
if (haveBufferedCharacterToken())
return true;
m_state = State::DataState;
source.advanceAndUpdateLineNumber();
m_token->clear();
m_token->makeEndOfFile();
return true;
}
bool shouldSkipNullCharacters() const { return true; }
private:
WebVTTTokenizer();
// m_token is owned by the caller. If nextToken is not on the stack,
// this member might be pointing to unallocated memory.
WebVTTToken* m_token;
WebVTTTokenizerState::State m_state;
Vector<LChar, 32> m_buffer;
// ://www.whatwg.org/specs/web-apps/current-work/#preprocessing-the-input-stream
InputStreamPreprocessor<WebVTTTokenizer> m_inputStreamPreprocessor;
};
}
#endif
#endif
|
