| /* |
| * 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 SKY_ENGINE_WTF_TEXT_STRINGVIEW_H_ |
| #define SKY_ENGINE_WTF_TEXT_STRINGVIEW_H_ |
| |
| #include "sky/engine/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 // SKY_ENGINE_WTF_TEXT_STRINGVIEW_H_ |