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/*
* 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 WebVTTParser_h
#define WebVTTParser_h
#if ENABLE(VIDEO_TRACK)
#include "DocumentFragment.h"
#include "HTMLNames.h"
#include "TextTrackRegion.h"
#include "WebVTTTokenizer.h"
#include <wtf/PassOwnPtr.h>
#include <wtf/text/StringBuilder.h>
namespace WebCore {
using namespace HTMLNames;
class Document;
class WebVTTParserClient {
public:
virtual ~WebVTTParserClient() { }
virtual void newCuesParsed() = 0;
#if ENABLE(WEBVTT_REGIONS)
virtual void newRegionsParsed() = 0;
#endif
virtual void fileFailedToParse() = 0;
};
class WebVTTCueData : public RefCounted<WebVTTCueData> {
public:
static PassRefPtr<WebVTTCueData> create() { return adoptRef(new WebVTTCueData()); }
virtual ~WebVTTCueData() { }
double startTime() const { return m_startTime; }
void setStartTime(double startTime) { m_startTime = startTime; }
double endTime() const { return m_endTime; }
void setEndTime(double 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; }
private:
WebVTTCueData()
: m_startTime(0)
, m_endTime(0)
{
}
double m_startTime;
double m_endTime;
String m_id;
String m_content;
String m_settings;
};
class WebVTTParser {
public:
virtual ~WebVTTParser() { }
enum ParseState {
Initial,
Header,
#if ENABLE(WEBVTT_REGIONS)
Metadata,
#endif
Id,
TimingsAndSettings,
CueText,
BadCue
};
static PassOwnPtr<WebVTTParser> create(WebVTTParserClient* client, ScriptExecutionContext* context)
{
return adoptPtr(new WebVTTParser(client, context));
}
static inline bool isRecognizedTag(const AtomicString& tagName)
{
return tagName == iTag
|| tagName == bTag
|| tagName == uTag
|| tagName == rubyTag
|| tagName == rtTag;
}
static inline bool isASpace(char c)
{
// WebVTT space characters are U+0020 SPACE, U+0009 CHARACTER TABULATION (tab), U+000A LINE FEED (LF), U+000C FORM FEED (FF), and U+000D CARRIAGE RETURN (CR).
return c == ' ' || c == '\t' || c == '\n' || c == '\f' || c == '\r';
}
static inline bool isValidSettingDelimiter(char 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 String collectDigits(const String&, unsigned*);
static String collectWord(const String&, unsigned*);
#if ENABLE(WEBVTT_REGIONS)
// Useful functions for parsing percentage settings.
static float parseFloatPercentageValue(const String&, bool&);
static FloatPoint parseFloatPercentageValuePair(const String&, char, bool&);
#endif
// Input data to the parser to parse.
void parseBytes(const char* data, unsigned length);
// Transfers ownership of last parsed cues to caller.
void getNewCues(Vector<RefPtr<WebVTTCueData> >&);
#if ENABLE(WEBVTT_REGIONS)
void getNewRegions(Vector<RefPtr<TextTrackRegion> >&);
#endif
PassRefPtr<DocumentFragment> createDocumentFragmentFromCueText(const String&);
double collectTimeStamp(const String&, unsigned*);
protected:
WebVTTParser(WebVTTParserClient*, ScriptExecutionContext*);
ScriptExecutionContext* m_scriptExecutionContext;
ParseState m_state;
private:
bool hasRequiredFileIdentifier();
ParseState collectCueId(const String&);
ParseState collectTimingsAndSettings(const String&);
ParseState collectCueText(const String&, unsigned length, unsigned);
ParseState ignoreBadCue(const String&);
void createNewCue();
void resetCueValues();
#if ENABLE(WEBVTT_REGIONS)
void collectHeader(const String&);
void createNewRegion();
#endif
void skipWhiteSpace(const String&, unsigned*);
static void skipLineTerminator(const char* data, unsigned length, unsigned*);
static String collectNextLine(const char* data, unsigned length, unsigned*);
void constructTreeFromToken(Document*);
String m_currentHeaderName;
String m_currentHeaderValue;
Vector<char> m_identifierData;
String m_currentId;
double m_currentStartTime;
double m_currentEndTime;
StringBuilder m_currentContent;
String m_currentSettings;
WebVTTToken m_token;
OwnPtr<WebVTTTokenizer> m_tokenizer;
RefPtr<ContainerNode> m_currentNode;
WebVTTParserClient* m_client;
Vector<AtomicString> m_languageStack;
Vector<RefPtr<WebVTTCueData> > m_cuelist;
#if ENABLE(WEBVTT_REGIONS)
Vector<RefPtr<TextTrackRegion> > m_regionList;
#endif
};
} // namespace WebCore
#endif
#endif
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