15c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)/* 25c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * Copyright (C) 2000 Lars Knoll (knoll@kde.org) 35c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * Copyright (C) 2003, 2004, 2006, 2007, 2009, 2010 Apple Inc. All right reserved. 45c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * 55c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * This library is free software; you can redistribute it and/or 65c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * modify it under the terms of the GNU Library General Public 75c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * License as published by the Free Software Foundation; either 85c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * version 2 of the License, or (at your option) any later version. 95c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * 105c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * This library is distributed in the hope that it will be useful, 115c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * but WITHOUT ANY WARRANTY; without even the implied warranty of 125c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 135c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * Library General Public License for more details. 145c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * 155c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * You should have received a copy of the GNU Library General Public License 165c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * along with this library; see the file COPYING.LIB. If not, write to 175c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, 185c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * Boston, MA 02110-1301, USA. 195c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * 205c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) */ 215c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 225c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)#ifndef BidiContext_h 235c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)#define BidiContext_h 245c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 251e202183a5dc46166763171984b285173f8585e5Torne (Richard Coles)#include "platform/PlatformExport.h" 267757ec2eadfa2dd8ac2aeed0a4399e9b07ec38cbBen Murdoch#include "wtf/Assertions.h" 277757ec2eadfa2dd8ac2aeed0a4399e9b07ec38cbBen Murdoch#include "wtf/PassRefPtr.h" 287757ec2eadfa2dd8ac2aeed0a4399e9b07ec38cbBen Murdoch#include "wtf/RefCounted.h" 297757ec2eadfa2dd8ac2aeed0a4399e9b07ec38cbBen Murdoch#include "wtf/RefPtr.h" 307757ec2eadfa2dd8ac2aeed0a4399e9b07ec38cbBen Murdoch#include "wtf/unicode/Unicode.h" 315c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 325c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)namespace WebCore { 335c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 345c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)enum BidiEmbeddingSource { 355c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) FromStyleOrDOM, 365c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) FromUnicode 375c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)}; 385c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 395c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)// Used to keep track of explicit embeddings. 401e202183a5dc46166763171984b285173f8585e5Torne (Richard Coles)class PLATFORM_EXPORT BidiContext : public RefCounted<BidiContext> { 415c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)public: 425c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) static PassRefPtr<BidiContext> create(unsigned char level, WTF::Unicode::Direction, bool override = false, BidiEmbeddingSource = FromStyleOrDOM, BidiContext* parent = 0); 435c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 445c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) BidiContext* parent() const { return m_parent.get(); } 455c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) unsigned char level() const { return m_level; } 465c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) WTF::Unicode::Direction dir() const { return static_cast<WTF::Unicode::Direction>(m_direction); } 475c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) bool override() const { return m_override; } 485c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) BidiEmbeddingSource source() const { return static_cast<BidiEmbeddingSource>(m_source); } 495c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 505c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) PassRefPtr<BidiContext> copyStackRemovingUnicodeEmbeddingContexts(); 5151b2906e11752df6c18351cf520e30522d3b53a1Torne (Richard Coles) 5251b2906e11752df6c18351cf520e30522d3b53a1Torne (Richard Coles) // http://www.unicode.org/reports/tr9/#Modifications 5351b2906e11752df6c18351cf520e30522d3b53a1Torne (Richard Coles) // 6.3 raised the limit from 61 to 125. 5451b2906e11752df6c18351cf520e30522d3b53a1Torne (Richard Coles) // http://unicode.org/reports/tr9/#BD2 5551b2906e11752df6c18351cf520e30522d3b53a1Torne (Richard Coles) static const unsigned char kMaxLevel = 125; 5651b2906e11752df6c18351cf520e30522d3b53a1Torne (Richard Coles) 575c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)private: 585c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) BidiContext(unsigned char level, WTF::Unicode::Direction direction, bool override, BidiEmbeddingSource source, BidiContext* parent) 595c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) : m_level(level) 605c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) , m_direction(direction) 615c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) , m_override(override) 625c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) , m_source(source) 635c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) , m_parent(parent) 645c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) { 6551b2906e11752df6c18351cf520e30522d3b53a1Torne (Richard Coles) ASSERT(level <= kMaxLevel); 665c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) } 675c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 685c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) static PassRefPtr<BidiContext> createUncached(unsigned char level, WTF::Unicode::Direction, bool override, BidiEmbeddingSource, BidiContext* parent); 695c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 7051b2906e11752df6c18351cf520e30522d3b53a1Torne (Richard Coles) unsigned m_level : 7; // The maximium bidi level is 125: http://unicode.org/reports/tr9/#Explicit_Levels_and_Directions 715c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) unsigned m_direction : 5; // Direction 725c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) unsigned m_override : 1; 735c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) unsigned m_source : 1; // BidiEmbeddingSource 745c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) RefPtr<BidiContext> m_parent; 755c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)}; 765c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 775c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)inline unsigned char nextGreaterOddLevel(unsigned char level) 785c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles){ 795c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) return (level + 1) | 1; 805c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)} 815c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 825c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)inline unsigned char nextGreaterEvenLevel(unsigned char level) 835c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles){ 845c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) return (level + 2) & ~1; 855c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)} 865c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 871e202183a5dc46166763171984b285173f8585e5Torne (Richard Coles)PLATFORM_EXPORT bool operator==(const BidiContext&, const BidiContext&); 885c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 895c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)} // namespace WebCore 905c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 915c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)#endif // BidiContext_h 92