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comparison: intl/unicharutil/util/nsBidiUtils.cpp
intl/unicharutil/util/nsBidiUtils.cpp
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| 1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- | |
| 2 * | |
| 3 * This Source Code Form is subject to the terms of the Mozilla Public | |
| 4 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 6 #include "nsBidiUtils.h" | |
| 7 | |
| 8 #define ARABIC_TO_HINDI_DIGIT_INCREMENT (START_HINDI_DIGITS - START_ARABIC_DIGITS) | |
| 9 #define PERSIAN_TO_HINDI_DIGIT_INCREMENT (START_HINDI_DIGITS - START_FARSI_DIGITS) | |
| 10 #define ARABIC_TO_PERSIAN_DIGIT_INCREMENT (START_FARSI_DIGITS - START_ARABIC_DIGITS) | |
| 11 #define NUM_TO_ARABIC(c) \ | |
| 12 ((((c)>=START_HINDI_DIGITS) && ((c)<=END_HINDI_DIGITS)) ? \ | |
| 13 ((c) - (uint16_t)ARABIC_TO_HINDI_DIGIT_INCREMENT) : \ | |
| 14 ((((c)>=START_FARSI_DIGITS) && ((c)<=END_FARSI_DIGITS)) ? \ | |
| 15 ((c) - (uint16_t)ARABIC_TO_PERSIAN_DIGIT_INCREMENT) : \ | |
| 16 (c))) | |
| 17 #define NUM_TO_HINDI(c) \ | |
| 18 ((((c)>=START_ARABIC_DIGITS) && ((c)<=END_ARABIC_DIGITS)) ? \ | |
| 19 ((c) + (uint16_t)ARABIC_TO_HINDI_DIGIT_INCREMENT): \ | |
| 20 ((((c)>=START_FARSI_DIGITS) && ((c)<=END_FARSI_DIGITS)) ? \ | |
| 21 ((c) + (uint16_t)PERSIAN_TO_HINDI_DIGIT_INCREMENT) : \ | |
| 22 (c))) | |
| 23 #define NUM_TO_PERSIAN(c) \ | |
| 24 ((((c)>=START_HINDI_DIGITS) && ((c)<=END_HINDI_DIGITS)) ? \ | |
| 25 ((c) - (uint16_t)PERSIAN_TO_HINDI_DIGIT_INCREMENT) : \ | |
| 26 ((((c)>=START_ARABIC_DIGITS) && ((c)<=END_ARABIC_DIGITS)) ? \ | |
| 27 ((c) + (uint16_t)ARABIC_TO_PERSIAN_DIGIT_INCREMENT) : \ | |
| 28 (c))) | |
| 29 | |
| 30 char16_t HandleNumberInChar(char16_t aChar, bool aPrevCharArabic, uint32_t aNumFlag) | |
| 31 { | |
| 32 // IBMBIDI_NUMERAL_NOMINAL * | |
| 33 // IBMBIDI_NUMERAL_REGULAR | |
| 34 // IBMBIDI_NUMERAL_HINDICONTEXT | |
| 35 // IBMBIDI_NUMERAL_ARABIC | |
| 36 // IBMBIDI_NUMERAL_HINDI | |
| 37 | |
| 38 switch (aNumFlag) { | |
| 39 case IBMBIDI_NUMERAL_HINDI: | |
| 40 return NUM_TO_HINDI(aChar); | |
| 41 case IBMBIDI_NUMERAL_ARABIC: | |
| 42 return NUM_TO_ARABIC(aChar); | |
| 43 case IBMBIDI_NUMERAL_PERSIAN: | |
| 44 return NUM_TO_PERSIAN(aChar); | |
| 45 case IBMBIDI_NUMERAL_REGULAR: | |
| 46 case IBMBIDI_NUMERAL_HINDICONTEXT: | |
| 47 case IBMBIDI_NUMERAL_PERSIANCONTEXT: | |
| 48 // for clipboard handling | |
| 49 //XXX do we really want to convert numerals when copying text? | |
| 50 if (aPrevCharArabic) { | |
| 51 if (aNumFlag == IBMBIDI_NUMERAL_PERSIANCONTEXT) | |
| 52 return NUM_TO_PERSIAN(aChar); | |
| 53 else | |
| 54 return NUM_TO_HINDI(aChar); | |
| 55 } | |
| 56 else | |
| 57 return NUM_TO_ARABIC(aChar); | |
| 58 case IBMBIDI_NUMERAL_NOMINAL: | |
| 59 default: | |
| 60 return aChar; | |
| 61 } | |
| 62 } | |
| 63 | |
| 64 nsresult HandleNumbers(char16_t* aBuffer, uint32_t aSize, uint32_t aNumFlag) | |
| 65 { | |
| 66 uint32_t i; | |
| 67 | |
| 68 switch (aNumFlag) { | |
| 69 case IBMBIDI_NUMERAL_HINDI: | |
| 70 case IBMBIDI_NUMERAL_ARABIC: | |
| 71 case IBMBIDI_NUMERAL_PERSIAN: | |
| 72 case IBMBIDI_NUMERAL_REGULAR: | |
| 73 case IBMBIDI_NUMERAL_HINDICONTEXT: | |
| 74 case IBMBIDI_NUMERAL_PERSIANCONTEXT: | |
| 75 for (i=0;i<aSize;i++) | |
| 76 aBuffer[i] = HandleNumberInChar(aBuffer[i], !!(i>0 ? aBuffer[i-1] : 0), aNumFlag); | |
| 77 break; | |
| 78 case IBMBIDI_NUMERAL_NOMINAL: | |
| 79 default: | |
| 80 break; | |
| 81 } | |
| 82 return NS_OK; | |
| 83 } | |
| 84 | |
| 85 bool HasRTLChars(const nsAString& aString) | |
| 86 { | |
| 87 // This is used to determine whether to enable bidi if a string has | |
| 88 // right-to-left characters. To simplify things, anything that could be a | |
| 89 // surrogate or RTL presentation form is covered just by testing >= 0xD800). | |
| 90 // It's fine to enable bidi in rare cases where it actually isn't needed. | |
| 91 int32_t length = aString.Length(); | |
| 92 for (int32_t i = 0; i < length; i++) { | |
| 93 char16_t ch = aString.CharAt(i); | |
| 94 if (ch >= 0xD800 || IS_IN_BMP_RTL_BLOCK(ch)) { | |
| 95 return true; | |
| 96 } | |
| 97 } | |
| 98 return false; | |
| 99 } |
