/* * Copyright (C) 2013 Google 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. */ #ifndef WTF_StringView_h #define WTF_StringView_h #include "wtf/text/StringImpl.h" namespace WTF { class WTF_EXPORT StringView { public: StringView() : m_offset(0) , m_length(0) { } explicit StringView(PassRefPtr<StringImpl> impl) : m_impl(impl) , m_offset(0) , m_length(m_impl->length()) { } StringView(PassRefPtr<StringImpl> impl, unsigned offset, unsigned length) : m_impl(impl) , m_offset(offset) , m_length(length) { ASSERT_WITH_SECURITY_IMPLICATION(offset + length <= m_impl->length()); } void narrow(unsigned offset, unsigned length) { ASSERT_WITH_SECURITY_IMPLICATION(offset + length <= m_length); m_offset += offset; m_length = length; } bool isEmpty() const { return !m_length; } unsigned length() const { return m_length; } bool is8Bit() const { return m_impl->is8Bit(); } const LChar* characters8() const { if (!m_impl) return 0; ASSERT(is8Bit()); return m_impl->characters8() + m_offset; } const UChar* characters16() const { if (!m_impl) return 0; ASSERT(!is8Bit()); return m_impl->characters16() + m_offset; } PassRefPtr<StringImpl> toString() const { if (!m_impl) return m_impl; if (m_impl->is8Bit()) return StringImpl::create(characters8(), m_length); return StringImpl::create(characters16(), m_length); } private: RefPtr<StringImpl> m_impl; unsigned m_offset; unsigned m_length; }; } using WTF::StringView; #endif