| /* |
| * Copyright (C) 2008, 2010 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: |
| * |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. 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. |
| * 3. Neither the name of Apple Inc. ("Apple") 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 APPLE AND ITS 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 APPLE OR ITS 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. |
| */ |
| |
| #ifndef StringBuffer_h |
| #define StringBuffer_h |
| |
| #include "wtf/Assertions.h" |
| #include "wtf/text/StringImpl.h" |
| #include "wtf/unicode/Unicode.h" |
| |
| namespace WTF { |
| |
| template <typename CharType> |
| class StringBuffer { |
| WTF_MAKE_NONCOPYABLE(StringBuffer); |
| public: |
| StringBuffer() { } |
| |
| explicit StringBuffer(unsigned length) |
| { |
| CharType* characters; |
| m_data = StringImpl::createUninitialized(length, characters); |
| } |
| |
| ~StringBuffer() |
| { |
| } |
| |
| void shrink(unsigned newLength) |
| { |
| if (m_data->length() == newLength) |
| return; |
| m_data->truncateAssumingIsolated(newLength); |
| } |
| |
| void resize(unsigned newLength) |
| { |
| if (!m_data) { |
| CharType* characters; |
| m_data = StringImpl::createUninitialized(newLength, characters); |
| return; |
| } |
| if (newLength > m_data->length()) { |
| CharType* characters; |
| m_data = StringImpl::reallocate(m_data.release(), newLength, characters); |
| return; |
| } |
| shrink(newLength); |
| } |
| |
| unsigned length() const { return m_data ? m_data->length() : 0; } |
| CharType* characters() { return length() ? const_cast<CharType*>(m_data->getCharacters<CharType>()) : 0; } |
| |
| CharType& operator[](unsigned i) { ASSERT_WITH_SECURITY_IMPLICATION(i < length()); return characters()[i]; } |
| |
| PassRefPtr<StringImpl> release() { return m_data.release(); } |
| |
| private: |
| RefPtr<StringImpl> m_data; |
| }; |
| |
| } // namespace WTF |
| |
| using WTF::StringBuffer; |
| |
| #endif // StringBuffer_h |