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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "config.h"
#include "core/css/parser/MediaQueryInputStream.h"
#include "core/html/parser/InputStreamPreprocessor.h"
namespace WebCore {
MediaQueryInputStream::MediaQueryInputStream(String input)
: m_offset(0)
, m_string(input)
{
}
UChar MediaQueryInputStream::peek(unsigned lookaheadOffset)
{
ASSERT((m_offset + lookaheadOffset) <= maxLength());
if ((m_offset + lookaheadOffset) >= m_string.length())
return kEndOfFileMarker;
return m_string[m_offset + lookaheadOffset];
}
void MediaQueryInputStream::advance(unsigned offset)
{
ASSERT(m_offset + offset <= maxLength());
m_offset += offset;
}
void MediaQueryInputStream::pushBack(UChar cc)
{
--m_offset;
ASSERT(nextInputChar() == cc);
}
unsigned long long MediaQueryInputStream::getUInt(unsigned start, unsigned end)
{
ASSERT(start <= end && ((m_offset + end) <= m_string.length()));
bool isResultOK = false;
unsigned long long result = 0;
if (start < end) {
if (m_string.is8Bit())
result = charactersToUInt64Strict(m_string.characters8() + m_offset + start, end - start, &isResultOK);
else
result = charactersToUInt64Strict(m_string.characters16() + m_offset + start, end - start, &isResultOK);
}
return isResultOK ? result : 0;
}
double MediaQueryInputStream::getDouble(unsigned start, unsigned end)
{
ASSERT(start <= end && ((m_offset + end) <= m_string.length()));
bool isResultOK = false;
double result = 0.0;
if (start < end) {
if (m_string.is8Bit())
result = charactersToDouble(m_string.characters8() + m_offset + start, end - start, &isResultOK);
else
result = charactersToDouble(m_string.characters16() + m_offset + start, end - start, &isResultOK);
}
return isResultOK ? result : 0.0;
}
} // namespace WebCore
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