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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.
*/
#include "platform/text/BidiTextRun.h"
#include "platform/text/BidiResolver.h"
#include "platform/text/TextRunIterator.h"
namespace blink {
TextDirection directionForRun(TextRun& run, bool* hasStrongDirectionality) {
if (!hasStrongDirectionality) {
// 8bit is Latin-1 and therefore is always LTR.
if (run.is8Bit())
return TextDirection::kLtr;
// length == 1 for more than 90% of cases of width() for CJK text.
if (run.length() == 1 && U16_IS_SINGLE(run.characters16()[0]))
return directionForCharacter(run.characters16()[0]);
}
BidiResolver<TextRunIterator, BidiCharacterRun> bidiResolver;
bidiResolver.setStatus(
BidiStatus(run.direction(), run.directionalOverride()));
bidiResolver.setPositionIgnoringNestedIsolates(TextRunIterator(&run, 0));
return bidiResolver.determineDirectionality(hasStrongDirectionality);
}
TextDirection determineDirectionality(const String& value,
bool* hasStrongDirectionality) {
TextRun run(value);
return directionForRun(run, hasStrongDirectionality);
}
TextRun textRunWithDirectionality(const String& value,
bool* hasStrongDirectionality) {
TextRun run(value);
TextDirection direction = directionForRun(run, hasStrongDirectionality);
if (hasStrongDirectionality)
run.setDirection(direction);
return run;
}
} // namespace blink
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