1/* 2 * Copyright (C) 2012, 2013 Apple Inc. All rights reserved. 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 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY 14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR 17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26#ifndef JSStringJoiner_h 27#define JSStringJoiner_h 28 29#include "JSCJSValue.h" 30#include <wtf/Vector.h> 31#include <wtf/text/WTFString.h> 32 33namespace JSC { 34 35class ExecState; 36 37 38class JSStringJoiner { 39public: 40 JSStringJoiner(const String& separator, size_t stringCount); 41 42 void append(const String&); 43 JSValue join(ExecState*); 44 45private: 46 String m_separator; 47 Vector<String> m_strings; 48 49 Checked<unsigned, RecordOverflow> m_accumulatedStringsLength; 50 bool m_isValid; 51 bool m_is8Bits; 52}; 53 54inline JSStringJoiner::JSStringJoiner(const String& separator, size_t stringCount) 55 : m_separator(separator) 56 , m_isValid(true) 57 , m_is8Bits(m_separator.is8Bit()) 58{ 59 ASSERT(!m_separator.isNull()); 60 m_isValid = m_strings.tryReserveCapacity(stringCount); 61} 62 63inline void JSStringJoiner::append(const String& str) 64{ 65 if (!m_isValid) 66 return; 67 68 m_strings.append(str); 69 if (!str.isNull()) { 70 m_accumulatedStringsLength += str.length(); 71 m_is8Bits = m_is8Bits && str.is8Bit(); 72 } 73} 74 75} 76 77#endif 78