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// Copyright 2014 The Chromium Authors. All rights reserved.
// Copyright (C) 2016 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:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * 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.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "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 THE COPYRIGHT
// OWNER 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.
#pragma once
#include <wtf/text/StringView.h>
namespace WebCore {
constexpr LChar kEndOfFileMarker = 0;
DECLARE_ALLOCATOR_WITH_HEAP_IDENTIFIER(CSSTokenizerInputStream);
class CSSTokenizerInputStream {
WTF_MAKE_NONCOPYABLE(CSSTokenizerInputStream);
WTF_MAKE_FAST_ALLOCATED_WITH_HEAP_IDENTIFIER(CSSTokenizerInputStream);
public:
explicit CSSTokenizerInputStream(const String& input);
// Gets the char in the stream. Will return (NUL) kEndOfFileMarker when at the
// end of the stream.
UChar nextInputChar() const
{
if (m_offset >= m_stringLength)
return kEndOfFileMarker;
return (*m_string)[m_offset];
}
// Gets the char at lookaheadOffset from the current stream position. Will
// return NUL (kEndOfFileMarker) if the stream position is at the end.
UChar peek(unsigned lookaheadOffset) const
{
if ((m_offset + lookaheadOffset) >= m_stringLength)
return kEndOfFileMarker;
return (*m_string)[m_offset + lookaheadOffset];
}
void advance(unsigned offset = 1) { m_offset += offset; }
void pushBack(UChar cc)
{
--m_offset;
ASSERT_UNUSED(cc, nextInputChar() == cc);
}
double getDouble(unsigned start, unsigned end) const;
template<bool characterPredicate(UChar)>
unsigned skipWhilePredicate(unsigned offset)
{
if (m_string->is8Bit()) {
auto characters8 = m_string->span8();
while ((m_offset + offset) < m_stringLength && characterPredicate(characters8[m_offset + offset]))
++offset;
} else {
auto characters16 = m_string->span16();
while ((m_offset + offset) < m_stringLength && characterPredicate(characters16[m_offset + offset]))
++offset;
}
return offset;
}
void advanceUntilNonWhitespace();
void advanceUntilNewlineOrNonWhitespace();
unsigned length() const { return m_stringLength; }
unsigned offset() const { return std::min(m_offset, m_stringLength); }
StringView rangeAt(unsigned start, unsigned length) const
{
ASSERT(start + length <= m_stringLength);
return StringView(m_string.get()).substring(start, length); // FIXME: Should make a constructor on StringView for this.
}
private:
size_t m_offset;
const size_t m_stringLength;
RefPtr<StringImpl> m_string;
};
} // namespace WebCore
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