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/*
* Copyright (C) 2010 Adam Barth. All Rights Reserved.
* Copyright (C) 2015 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 "HTMLSourceTracker.h"
#include "HTMLTokenizer.h"
#include <wtf/text/StringBuilder.h>
namespace WebCore {
HTMLSourceTracker::HTMLSourceTracker()
{
}
void HTMLSourceTracker::startToken(SegmentedString& currentInput, HTMLTokenizer& tokenizer)
{
if (!m_started) {
if (tokenizer.numberOfBufferedCharacters())
m_previousSource = tokenizer.bufferedCharacters();
else
m_previousSource.clear();
m_started = true;
} else
m_previousSource.append(m_currentSource);
m_currentSource = currentInput;
m_tokenStart = m_currentSource.numberOfCharactersConsumed() - m_previousSource.length();
tokenizer.setTokenAttributeBaseOffset(m_tokenStart);
}
void HTMLSourceTracker::endToken(SegmentedString& currentInput, HTMLTokenizer& tokenizer)
{
ASSERT(m_started);
m_started = false;
m_tokenEnd = currentInput.numberOfCharactersConsumed() - tokenizer.numberOfBufferedCharacters();
m_cachedSourceForToken = String();
}
String HTMLSourceTracker::source(const HTMLToken& token)
{
ASSERT(!m_started);
if (token.type() == HTMLToken::EndOfFile)
return String(); // Hides the null character we use to mark the end of file.
if (!m_cachedSourceForToken.isEmpty())
return m_cachedSourceForToken;
unsigned length = m_tokenEnd - m_tokenStart;
StringBuilder source;
source.reserveCapacity(length);
unsigned i = 0;
for ( ; i < length && !m_previousSource.isEmpty(); ++i) {
source.append(m_previousSource.currentChar());
m_previousSource.advance();
}
for ( ; i < length; ++i) {
ASSERT(!m_currentSource.isEmpty());
source.append(m_currentSource.currentChar());
m_currentSource.advance();
}
m_cachedSourceForToken = source.toString();
return m_cachedSourceForToken;
}
String HTMLSourceTracker::source(const HTMLToken& token, unsigned attributeStart, unsigned attributeEnd)
{
return source(token).substring(attributeStart, attributeEnd - attributeStart);
}
}
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