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/*
* 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
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