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94 lines
3.1 KiB
C++
94 lines
3.1 KiB
C++
/*
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* Copyright (C) 2013 Google Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following disclaimer
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* in the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Google Inc. nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef SKY_ENGINE_WTF_TEXT_STRINGVIEW_H_
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#define SKY_ENGINE_WTF_TEXT_STRINGVIEW_H_
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#include "flutter/sky/engine/wtf/text/StringImpl.h"
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namespace WTF {
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class WTF_EXPORT StringView {
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public:
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StringView() : m_offset(0), m_length(0) {}
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explicit StringView(PassRefPtr<StringImpl> impl)
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: m_impl(impl), m_offset(0), m_length(m_impl->length()) {}
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StringView(PassRefPtr<StringImpl> impl, unsigned offset, unsigned length)
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: m_impl(impl), m_offset(offset), m_length(length) {
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ASSERT_WITH_SECURITY_IMPLICATION(offset + length <= m_impl->length());
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}
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void narrow(unsigned offset, unsigned length) {
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ASSERT_WITH_SECURITY_IMPLICATION(offset + length <= m_length);
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m_offset += offset;
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m_length = length;
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}
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bool isEmpty() const { return !m_length; }
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unsigned length() const { return m_length; }
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bool is8Bit() const { return m_impl->is8Bit(); }
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const LChar* characters8() const {
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if (!m_impl)
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return 0;
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ASSERT(is8Bit());
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return m_impl->characters8() + m_offset;
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}
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const UChar* characters16() const {
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if (!m_impl)
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return 0;
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ASSERT(!is8Bit());
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return m_impl->characters16() + m_offset;
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}
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PassRefPtr<StringImpl> toString() const {
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if (!m_impl)
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return m_impl;
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if (m_impl->is8Bit())
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return StringImpl::create(characters8(), m_length);
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return StringImpl::create(characters16(), m_length);
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}
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private:
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RefPtr<StringImpl> m_impl;
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unsigned m_offset;
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unsigned m_length;
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};
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} // namespace WTF
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using WTF::StringView;
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#endif // SKY_ENGINE_WTF_TEXT_STRINGVIEW_H_
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