// 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; class CSSTokenizerInputStream { WTF_MAKE_NONCOPYABLE(CSSTokenizerInputStream); WTF_MAKE_FAST_ALLOCATED; 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 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()) { 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 { 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