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/*
* Copyright (C) 2011-2017 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:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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 APPLE INC. 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.
*/
#include "config.h"
#include "TrackBase.h"
#include "Language.h"
#include <wtf/text/StringBuilder.h>
#if ENABLE(VIDEO_TRACK)
#include "HTMLMediaElement.h"
namespace WebCore {
static int s_uniqueId = 0;
TrackBase::TrackBase(Type type, const AtomicString& id, const AtomicString& label, const AtomicString& language)
: m_uniqueId(++s_uniqueId)
, m_id(id)
, m_label(label)
, m_language(language)
, m_validBCP47Language(language)
{
ASSERT(type != BaseTrack);
m_type = type;
}
TrackBase::~TrackBase()
{
}
Element* TrackBase::element()
{
return m_mediaElement;
}
// See: https://tools.ietf.org/html/bcp47#section-2.1
static bool isValidBCP47LanguageTag(const String& languageTag)
{
auto const length = languageTag.length();
// Max length picked as double the longest example tag in spec which is 49 characters:
// https://tools.ietf.org/html/bcp47#section-4.4.2
if (length < 2 || length > 100)
return false;
UChar firstChar = languageTag[0];
if (!isASCIIAlpha(firstChar))
return false;
UChar secondChar = languageTag[1];
if (length == 2)
return isASCIIAlpha(secondChar);
bool grandFatheredIrregularOrPrivateUse = (firstChar == 'i' || firstChar == 'x') && secondChar == '-';
unsigned nextCharIndexToCheck;
if (!grandFatheredIrregularOrPrivateUse) {
if (!isASCIIAlpha(secondChar))
return false;
if (length == 3)
return isASCIIAlpha(languageTag[2]);
if (isASCIIAlpha(languageTag[2])) {
if (languageTag[3] == '-')
nextCharIndexToCheck = 4;
else
return false;
} else if (languageTag[2] == '-')
nextCharIndexToCheck = 3;
else
return false;
} else
nextCharIndexToCheck = 2;
for (; nextCharIndexToCheck < length; ++nextCharIndexToCheck) {
UChar c = languageTag[nextCharIndexToCheck];
if (isASCIIAlphanumeric(c) || c == '-')
continue;
return false;
}
return true;
}
void TrackBase::setLanguage(const AtomicString& language)
{
if (!language.isEmpty() && !isValidBCP47LanguageTag(language)) {
String message;
if (language.contains((UChar)'\0'))
message = WTF::ASCIILiteral("The language contains a null character and is not a valid BCP 47 language tag.");
else {
StringBuilder stringBuilder;
stringBuilder.appendLiteral("The language '");
stringBuilder.append(language);
stringBuilder.appendLiteral("' is not a valid BCP 47 language tag.");
message = stringBuilder.toString();
}
if (auto element = this->element())
element->document().addConsoleMessage(MessageSource::Rendering, MessageLevel::Warning, message);
} else
m_validBCP47Language = language;
m_language = language;
}
AtomicString TrackBase::validBCP47Language() const
{
return m_validBCP47Language;
}
MediaTrackBase::MediaTrackBase(Type type, const AtomicString& id, const AtomicString& label, const AtomicString& language)
: TrackBase(type, id, label, language)
{
}
void MediaTrackBase::setKind(const AtomicString& kind)
{
setKindInternal(kind);
}
void MediaTrackBase::setKindInternal(const AtomicString& kind)
{
if (isValidKind(kind))
m_kind = kind;
else
m_kind = emptyAtom();
}
} // namespace WebCore
#endif
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