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/*
* Copyright (C) 2003, 2006 Apple Computer, 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:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``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 APPLE COMPUTER, INC. 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 THIRD_PARTY_BLINK_RENDERER_PLATFORM_TEXT_TEXT_DIRECTION_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_TEXT_TEXT_DIRECTION_H_
#include <cstdint>
#include <iosfwd>
#include "base/i18n/rtl.h"
#include "base/notreached.h"
#include "third_party/blink/renderer/platform/platform_export.h"
namespace blink {
// The direction of text in bidirectional scripts such as Arabic or Hebrew.
//
// Used for explicit directions such as in the HTML dir attribute or the CSS
// 'direction' property.
// https://html.spec.whatwg.org/C/#the-dir-attribute
// https://drafts.csswg.org/css-writing-modes/#direction
//
// Also used for resolved directions by UAX#9 UNICODE BIDIRECTIONAL ALGORITHM.
// http://unicode.org/reports/tr9/
enum class TextDirection : uint8_t { kLtr = 0, kRtl = 1 };
inline bool IsLtr(TextDirection direction) {
return direction == TextDirection::kLtr;
}
inline bool IsRtl(TextDirection direction) {
return direction != TextDirection::kLtr;
}
inline TextDirection DirectionFromLevel(unsigned level) {
return level & 1 ? TextDirection::kRtl : TextDirection::kLtr;
}
PLATFORM_EXPORT std::ostream& operator<<(std::ostream&, TextDirection);
inline base::i18n::TextDirection ToBaseTextDirection(TextDirection direction) {
switch (direction) {
case TextDirection::kLtr:
return base::i18n::TextDirection::LEFT_TO_RIGHT;
case TextDirection::kRtl:
return base::i18n::TextDirection::RIGHT_TO_LEFT;
}
NOTREACHED();
}
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_TEXT_TEXT_DIRECTION_H_
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