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/*
* Copyright (C) 2011, 2013 Google Inc. All rights reserved.
* Copyright (C) 2013 Cable Television Labs, Inc.
* Copyright (C) 2014 Apple 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 WebVTTParser_h
#define WebVTTParser_h
#if ENABLE(VIDEO_TRACK)
#include "BufferedLineReader.h"
#include "DocumentFragment.h"
#include "HTMLNames.h"
#include "TextResourceDecoder.h"
#include "VTTRegion.h"
#include "WebVTTTokenizer.h"
#include <memory>
#include <wtf/MediaTime.h>
#include <wtf/text/StringBuilder.h>
namespace WebCore {
using namespace HTMLNames;
class Document;
class ISOWebVTTCue;
class VTTScanner;
class WebVTTParserClient {
public:
virtual ~WebVTTParserClient() { }
virtual void newCuesParsed() = 0;
virtual void newRegionsParsed() = 0;
virtual void fileFailedToParse() = 0;
};
class WebVTTCueData final : public RefCounted<WebVTTCueData> {
public:
static Ref<WebVTTCueData> create() { return adoptRef(*new WebVTTCueData()); }
~WebVTTCueData() { }
MediaTime startTime() const { return m_startTime; }
void setStartTime(const MediaTime& startTime) { m_startTime = startTime; }
MediaTime endTime() const { return m_endTime; }
void setEndTime(const MediaTime& endTime) { m_endTime = endTime; }
String id() const { return m_id; }
void setId(String id) { m_id = id; }
String content() const { return m_content; }
void setContent(String content) { m_content = content; }
String settings() const { return m_settings; }
void setSettings(String settings) { m_settings = settings; }
MediaTime originalStartTime() const { return m_originalStartTime; }
void setOriginalStartTime(const MediaTime& time) { m_originalStartTime = time; }
private:
WebVTTCueData() { }
MediaTime m_startTime;
MediaTime m_endTime;
MediaTime m_originalStartTime;
String m_id;
String m_content;
String m_settings;
};
class WebVTTParser final {
public:
enum ParseState {
Initial,
Header,
Id,
TimingsAndSettings,
CueText,
BadCue,
Finished
};
WebVTTParser(WebVTTParserClient*, ScriptExecutionContext*);
static inline bool isRecognizedTag(const AtomicString& tagName)
{
return tagName == iTag
|| tagName == bTag
|| tagName == uTag
|| tagName == rubyTag
|| tagName == rtTag;
}
static inline bool isValidSettingDelimiter(UChar c)
{
// ... a WebVTT cue consists of zero or more of the following components, in any order, separated from each other by one or more
// U+0020 SPACE characters or U+0009 CHARACTER TABULATION (tab) characters.
return c == ' ' || c == '\t';
}
static bool collectTimeStamp(const String&, MediaTime&);
// Useful functions for parsing percentage settings.
static bool parseFloatPercentageValue(VTTScanner& valueScanner, float&);
static bool parseFloatPercentageValuePair(VTTScanner& valueScanner, char, FloatPoint&);
// Input data to the parser to parse.
void parseBytes(const char*, unsigned);
void parseFileHeader(const String&);
void parseCueData(const ISOWebVTTCue&);
void flush();
void fileFinished();
// Transfers ownership of last parsed cues to caller.
void getNewCues(Vector<RefPtr<WebVTTCueData>>&);
void getNewRegions(Vector<RefPtr<VTTRegion>>&);
// Create the DocumentFragment representation of the WebVTT cue text.
static PassRefPtr<DocumentFragment> createDocumentFragmentFromCueText(Document&, const String&);
protected:
ScriptExecutionContext* m_scriptExecutionContext;
ParseState m_state;
private:
void parse();
void flushPendingCue();
bool hasRequiredFileIdentifier(const String&);
ParseState collectCueId(const String&);
ParseState collectTimingsAndSettings(const String&);
ParseState collectCueText(const String&);
ParseState recoverCue(const String&);
ParseState ignoreBadCue(const String&);
void createNewCue();
void resetCueValues();
void collectMetadataHeader(const String&);
void createNewRegion(const String& headerValue);
static bool collectTimeStamp(VTTScanner& input, MediaTime& timeStamp);
BufferedLineReader m_lineReader;
RefPtr<TextResourceDecoder> m_decoder;
String m_currentId;
MediaTime m_currentStartTime;
MediaTime m_currentEndTime;
StringBuilder m_currentContent;
String m_currentSettings;
WebVTTParserClient* m_client;
Vector<RefPtr<WebVTTCueData>> m_cuelist;
Vector<RefPtr<VTTRegion>> m_regionList;
};
} // namespace WebCore
#endif
#endif
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