| /* |
| * 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 TextDirection_h |
| #define TextDirection_h |
| |
| #include <cstdint> |
| #include <iosfwd> |
| #include "platform/PlatformExport.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/multipage/dom.html#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); |
| |
| } // namespace blink |
| |
| #endif |
