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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.
#ifndef CSSTokenizerInputStream_h
#define CSSTokenizerInputStream_h
#include "wtf/text/StringView.h"
#include "wtf/text/WTFString.h"
namespace blink {
class CSSTokenizerInputStream {
WTF_MAKE_NONCOPYABLE(CSSTokenizerInputStream);
USING_FAST_MALLOC(CSSTokenizerInputStream);
public:
explicit CSSTokenizerInputStream(const String& input);
// Gets the char in the stream replacing NUL characters with a unicode
// replacement character. Will return (NUL) kEndOfFileMarker when at the
// end of the stream.
UChar nextInputChar() const {
if (m_offset >= m_stringLength)
return '\0';
UChar result = (*m_string)[m_offset];
return result ? result : 0xFFFD;
}
// Gets the char at lookaheadOffset from the current stream position. Will
// return NUL (kEndOfFileMarker) if the stream position is at the end.
// NOTE: This may *also* return NUL if there's one in the input! Never
// compare the return value to '\0'.
UChar peekWithoutReplacement(unsigned lookaheadOffset) const {
if ((m_offset + lookaheadOffset) >= m_stringLength)
return '\0';
return (*m_string)[m_offset + lookaheadOffset];
}
void advance(unsigned offset = 1) { m_offset += offset; }
void pushBack(UChar cc) {
--m_offset;
DCHECK(nextInputChar() == cc);
}
double getDouble(unsigned start, unsigned end) const;
template <bool characterPredicate(UChar)>
unsigned skipWhilePredicate(unsigned offset) {
if (m_string->is8Bit()) {
const LChar* characters8 = m_string->characters8();
while ((m_offset + offset) < m_stringLength &&
characterPredicate(characters8[m_offset + offset]))
++offset;
} else {
const UChar* characters16 = m_string->characters16();
while ((m_offset + offset) < m_stringLength &&
characterPredicate(characters16[m_offset + offset]))
++offset;
}
return offset;
}
void advanceUntilNonWhitespace();
unsigned length() const { return m_stringLength; }
unsigned offset() const { return std::min(m_offset, m_stringLength); }
StringView rangeAt(unsigned start, unsigned length) const {
DCHECK(start + length <= m_stringLength);
return StringView(*m_string, start, length);
}
private:
size_t m_offset;
const size_t m_stringLength;
const RefPtr<StringImpl> m_string;
};
} // namespace blink
#endif // CSSTokenizerInputStream_h
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