1/*
2
3Copyright (C) 2014 Apple Inc. All rights reserved.
4
5Redistribution and use in source and binary forms, with or without
6modification, are permitted provided that the following conditions
7are met:
81. Redistributions of source code must retain the above copyright
9 notice, this list of conditions and the following disclaimer.
102. Redistributions in binary form must reproduce the above copyright
11 notice, this list of conditions and the following disclaimer in the
12 documentation and/or other materials provided with the distribution.
13
14THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
15EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
16WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
17DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
18DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
19(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
20LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
21ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
23SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24
25*/
26
27#include "config.h"
28#include "InlineIterator.h"
29
30namespace WebCore {
31
32UCharDirection InlineIterator::surrogateTextDirection(UChar currentCodeUnit) const
33{
34 RenderText& text = downcast<RenderText>(*m_renderer);
35 UChar lead;
36 UChar trail;
37 if (U16_IS_LEAD(currentCodeUnit)) {
38 lead = currentCodeUnit;
39 trail = text.characterAt(m_pos + 1);
40 if (!U16_IS_TRAIL(trail))
41 return U_OTHER_NEUTRAL;
42 } else {
43 ASSERT(U16_IS_TRAIL(currentCodeUnit));
44 lead = text.characterAt(m_pos - 1);
45 if (!U16_IS_LEAD(lead))
46 return U_OTHER_NEUTRAL;
47 trail = currentCodeUnit;
48 }
49 return u_charDirection(U16_GET_SUPPLEMENTARY(lead, trail));
50}
51
52}
53