HTMLSourceTracker.cpp [plain text]
#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();
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);
}
}