1/* 2 * Copyright (C) 2013 Igalia S.L. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY IGALIA AND ITS CONTRIBUTORS "AS IS" AND ANY 15 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 16 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 17 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY 18 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 19 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 20 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 21 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26#ifndef UTF16UChar32Iterator_h 27#define UTF16UChar32Iterator_h 28 29namespace WebCore { 30 31class UTF16UChar32Iterator { 32 WTF_MAKE_NONCOPYABLE(UTF16UChar32Iterator); 33public: 34 UTF16UChar32Iterator(const UChar* buffer, unsigned bufferLength) 35 : m_buffer(buffer) 36 , m_bufferLength(bufferLength) 37 , m_currentOffset(0) 38 { 39 } 40 41 static UChar32 end() 42 { 43 return static_cast<UChar32>(-1); 44 } 45 46 UChar32 next() 47 { 48 if (m_currentOffset >= m_bufferLength) 49 return end(); 50 51 const UChar32 character = m_buffer[m_currentOffset++]; 52 if (U16_IS_SURROGATE_LEAD(character) 53 && m_currentOffset != m_bufferLength 54 && U16_IS_TRAIL(m_buffer[m_currentOffset])) { 55 return U16_GET_SUPPLEMENTARY(character, m_buffer[m_currentOffset++]); 56 } 57 58 return character; 59 } 60 61private: 62 const UChar* m_buffer; 63 unsigned m_bufferLength; 64 unsigned m_currentOffset; 65}; 66 67} // namespace WebCore 68 69 70#endif // UTF16UChar32Iterator_h 71