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/*
* Copyright (C) 2010 Adam Barth. 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 "core/html/parser/HTMLSourceTracker.h"
#include "core/html/parser/HTMLTokenizer.h"
#include "wtf/text/StringBuilder.h"
namespace blink {
HTMLSourceTracker::HTMLSourceTracker()
: m_isStarted(false)
{
}
void HTMLSourceTracker::start(SegmentedString& currentInput, HTMLTokenizer* tokenizer, HTMLToken& token)
{
if (token.type() == HTMLToken::Uninitialized && !m_isStarted) {
m_previousSource.clear();
if (tokenizer->numberOfBufferedCharacters())
m_previousSource = tokenizer->bufferedCharacters();
} else
m_previousSource.append(m_currentSource);
m_isStarted = true;
m_currentSource = currentInput;
token.setBaseOffset(m_currentSource.numberOfCharactersConsumed() - m_previousSource.length());
}
void HTMLSourceTracker::end(SegmentedString& currentInput, HTMLTokenizer* tokenizer, HTMLToken& token)
{
m_isStarted = false;
m_cachedSourceForToken = String();
// FIXME: This work should really be done by the HTMLTokenizer.
token.end(currentInput.numberOfCharactersConsumed() - tokenizer->numberOfBufferedCharacters());
}
String HTMLSourceTracker::sourceForToken(const HTMLToken& token)
{
if (!m_cachedSourceForToken.isEmpty())
return m_cachedSourceForToken;
size_t length;
if (token.type() == HTMLToken::EndOfFile) {
// Consume the remainder of the input, omitting the null character we use to mark the end of the file.
length = m_previousSource.length() + m_currentSource.length() - 1;
} else {
ASSERT(!token.startIndex());
length = static_cast<size_t>(token.endIndex() - token.startIndex());
}
StringBuilder source;
source.reserveCapacity(length);
size_t 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;
}
}
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