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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.
*/
#pragma once
#if ENABLE(VIDEO)
#include "BufferedLineReader.h"
#include "DocumentFragment.h"
#include "HTMLNames.h"
#include "TextResourceDecoder.h"
#include "VTTRegion.h"
#include <memory>
#include <wtf/MediaTime.h>
#include <wtf/TZoneMalloc.h>
#include <wtf/text/StringBuilder.h>
namespace WebCore {
using namespace HTMLNames;
class Document;
class ISOWebVTTCue;
class VTTScanner;
class WebVTTParserClient {
public:
virtual ~WebVTTParserClient() = default;
virtual void newCuesParsed() = 0;
virtual void newRegionsParsed() = 0;
virtual void newStyleSheetsParsed() = 0;
virtual void fileFailedToParse() = 0;
};
class WebVTTCueData final : public RefCounted<WebVTTCueData> {
WTF_MAKE_TZONE_ALLOCATED_EXPORT(WebVTTCueData, WEBCORE_EXPORT);
public:
static Ref<WebVTTCueData> create() { return adoptRef(*new WebVTTCueData()); }
~WebVTTCueData() = default;
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; }
AtomString id() const { return m_id; }
void setId(const AtomString& id) { m_id = id; }
String content() const { return m_content; }
void setContent(const String& content) { m_content = content; }
String settings() const { return m_settings; }
void setSettings(const String& settings) { m_settings = settings; }
MediaTime originalStartTime() const { return m_originalStartTime; }
void setOriginalStartTime(const MediaTime& time) { m_originalStartTime = time; }
private:
WebVTTCueData() = default;
MediaTime m_startTime;
MediaTime m_endTime;
MediaTime m_originalStartTime;
AtomString m_id;
String m_content;
String m_settings;
};
class WEBCORE_EXPORT WebVTTParser final {
WTF_MAKE_TZONE_ALLOCATED_EXPORT(WebVTTParser, WEBCORE_EXPORT);
public:
enum ParseState {
Initial,
Header,
Id,
TimingsAndSettings,
CueText,
Region,
Style,
BadCue,
Finished
};
WebVTTParser() = delete;
WebVTTParser(WebVTTParserClient&, Document&);
static inline bool isRecognizedTag(const AtomString& tagName)
{
return tagName == iTag
|| tagName == bTag
|| tagName == uTag
|| tagName == rubyTag
|| tagName == rtTag;
}
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(std::span<const uint8_t>);
void parseFileHeader(String&&);
void parseCueData(const ISOWebVTTCue&);
void flush();
void fileFinished();
// Transfers ownership of last parsed cues to caller.
Vector<Ref<WebVTTCueData>> takeCues();
Vector<Ref<VTTRegion>> takeRegions();
Vector<String> takeStyleSheets();
// Create the DocumentFragment representation of the WebVTT cue text.
static Ref<DocumentFragment> createDocumentFragmentFromCueText(Document&, const String&);
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&);
ParseState collectRegionSettings(const String&);
ParseState collectWebVTTBlock(const String&);
ParseState checkAndRecoverCue(const String& line);
ParseState collectStyleSheet(const String&);
bool checkAndCreateRegion(StringView line);
bool checkAndStoreRegion(StringView line);
bool checkStyleSheet(StringView line);
bool checkAndStoreStyleSheet(StringView line);
void createNewCue();
void resetCueValues();
static bool collectTimeStamp(VTTScanner& input, MediaTime& timeStamp);
Document& m_document;
ParseState m_state { Initial };
BufferedLineReader m_lineReader;
RefPtr<TextResourceDecoder> m_decoder;
AtomString m_currentId;
MediaTime m_currentStartTime;
MediaTime m_currentEndTime;
StringBuilder m_currentContent;
String m_previousLine;
String m_currentSettings;
RefPtr<VTTRegion> m_currentRegion;
StringBuilder m_currentSourceStyleSheet;
WebVTTParserClient& m_client;
Vector<Ref<WebVTTCueData>> m_cuelist;
Vector<Ref<VTTRegion>> m_regionList;
Vector<String> m_styleSheets;
};
} // namespace WebCore
#endif // ENABLE(VIDEO)
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