gfxScriptItemizer.h (3771B)
1 /* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ 2 /* This Source Code Form is subject to the terms of the Mozilla Public 3 * License, v. 2.0. If a copy of the MPL was not distributed with this 4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ 5 6 /* 7 * This file is based on usc_impl.c from ICU 4.2.0.1, slightly adapted 8 * for use within Mozilla Gecko, separate from a standard ICU build. 9 * 10 * The original ICU license of the code follows: 11 * 12 * ICU License - ICU 1.8.1 and later 13 * 14 * COPYRIGHT AND PERMISSION NOTICE 15 * 16 * Copyright (c) 1995-2009 International Business Machines Corporation and 17 * others 18 * 19 * All rights reserved. 20 * 21 * Permission is hereby granted, free of charge, to any person obtaining a 22 * copy of this software and associated documentation files (the "Software"), 23 * to deal in the Software without restriction, including without limitation 24 * the rights to use, copy, modify, merge, publish, distribute, and/or sell 25 * copies of the Software, and to permit persons to whom the Software is 26 * furnished to do so, provided that the above copyright notice(s) and this 27 * permission notice appear in all copies of the Software and that both the 28 * above copyright notice(s) and this permission notice appear in supporting 29 * documentation. 30 * 31 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 32 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 33 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. 34 * IN NO EVENT SHALL THE COPYRIGHT HOLDER OR HOLDERS INCLUDED IN THIS NOTICE 35 * BE LIABLE FOR ANY CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, 36 * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, 37 * WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, 38 * ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS 39 * SOFTWARE. 40 * 41 * Except as contained in this notice, the name of a copyright holder shall 42 * not be used in advertising or otherwise to promote the sale, use or other 43 * dealings in this Software without prior written authorization of the 44 * copyright holder. 45 * 46 * All trademarks and registered trademarks mentioned herein are the property 47 * of their respective owners. 48 */ 49 50 #ifndef GFX_SCRIPTITEMIZER_H 51 #define GFX_SCRIPTITEMIZER_H 52 53 #include <stdint.h> 54 #include "mozilla/Attributes.h" 55 #include "mozilla/intl/UnicodeScriptCodes.h" 56 57 #define PAREN_STACK_DEPTH 32 58 59 class gfxScriptItemizer { 60 public: 61 using Script = mozilla::intl::Script; 62 63 gfxScriptItemizer() = default; 64 gfxScriptItemizer(const gfxScriptItemizer& aOther) = delete; 65 gfxScriptItemizer(gfxScriptItemizer&& aOther) = delete; 66 67 void SetText(const char16_t* aText, uint32_t aLength) { 68 textPtr._2b = aText; 69 textLength = aLength; 70 textIs8bit = false; 71 } 72 73 void SetText(const unsigned char* aText, uint32_t aLength) { 74 textPtr._1b = aText; 75 textLength = aLength; 76 textIs8bit = true; 77 } 78 79 struct Run { 80 uint32_t mOffset = 0; 81 uint32_t mLength = 0; 82 Script mScript = Script::COMMON; 83 84 MOZ_IMPLICIT operator bool() const { return mLength > 0; } 85 }; 86 87 Run Next(); 88 89 protected: 90 void push(uint32_t endPairChar, Script newScriptCode); 91 void pop(); 92 void fixup(Script newScriptCode); 93 94 struct ParenStackEntry { 95 uint32_t endPairChar; 96 Script scriptCode; 97 }; 98 99 union { 100 const char16_t* _2b; 101 const unsigned char* _1b; 102 } textPtr; 103 uint32_t textLength; 104 bool textIs8bit; 105 106 uint32_t scriptStart = 0; 107 uint32_t scriptLimit = 0; 108 Script scriptCode = Script::INVALID; 109 110 struct ParenStackEntry parenStack[PAREN_STACK_DEPTH]; 111 uint32_t parenSP = -1; 112 uint32_t pushCount = 0; 113 uint32_t fixupCount = 0; 114 }; 115 116 #endif /* GFX_SCRIPTITEMIZER_H */