intl/unicharutil/util/nsBidiUtils.cpp@6474c204b198 (annotated)
intl/unicharutil/util/nsBidiUtils.cpp
Wed, 31 Dec 2014 06:09:35 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Wed, 31 Dec 2014 06:09:35 +0100
- changeset 0
- 6474c204b198
- permissions
- -rw-r--r--
Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.
| michael@0 | 1 | /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- |
| michael@0 | 2 | * |
| michael@0 | 3 | * This Source Code Form is subject to the terms of the Mozilla Public |
| michael@0 | 4 | * License, v. 2.0. If a copy of the MPL was not distributed with this |
| michael@0 | 5 | * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ |
| michael@0 | 6 | #include "nsBidiUtils.h" |
| michael@0 | 7 | |
| michael@0 | 8 | #define ARABIC_TO_HINDI_DIGIT_INCREMENT (START_HINDI_DIGITS - START_ARABIC_DIGITS) |
| michael@0 | 9 | #define PERSIAN_TO_HINDI_DIGIT_INCREMENT (START_HINDI_DIGITS - START_FARSI_DIGITS) |
| michael@0 | 10 | #define ARABIC_TO_PERSIAN_DIGIT_INCREMENT (START_FARSI_DIGITS - START_ARABIC_DIGITS) |
| michael@0 | 11 | #define NUM_TO_ARABIC(c) \ |
| michael@0 | 12 | ((((c)>=START_HINDI_DIGITS) && ((c)<=END_HINDI_DIGITS)) ? \ |
| michael@0 | 13 | ((c) - (uint16_t)ARABIC_TO_HINDI_DIGIT_INCREMENT) : \ |
| michael@0 | 14 | ((((c)>=START_FARSI_DIGITS) && ((c)<=END_FARSI_DIGITS)) ? \ |
| michael@0 | 15 | ((c) - (uint16_t)ARABIC_TO_PERSIAN_DIGIT_INCREMENT) : \ |
| michael@0 | 16 | (c))) |
| michael@0 | 17 | #define NUM_TO_HINDI(c) \ |
| michael@0 | 18 | ((((c)>=START_ARABIC_DIGITS) && ((c)<=END_ARABIC_DIGITS)) ? \ |
| michael@0 | 19 | ((c) + (uint16_t)ARABIC_TO_HINDI_DIGIT_INCREMENT): \ |
| michael@0 | 20 | ((((c)>=START_FARSI_DIGITS) && ((c)<=END_FARSI_DIGITS)) ? \ |
| michael@0 | 21 | ((c) + (uint16_t)PERSIAN_TO_HINDI_DIGIT_INCREMENT) : \ |
| michael@0 | 22 | (c))) |
| michael@0 | 23 | #define NUM_TO_PERSIAN(c) \ |
| michael@0 | 24 | ((((c)>=START_HINDI_DIGITS) && ((c)<=END_HINDI_DIGITS)) ? \ |
| michael@0 | 25 | ((c) - (uint16_t)PERSIAN_TO_HINDI_DIGIT_INCREMENT) : \ |
| michael@0 | 26 | ((((c)>=START_ARABIC_DIGITS) && ((c)<=END_ARABIC_DIGITS)) ? \ |
| michael@0 | 27 | ((c) + (uint16_t)ARABIC_TO_PERSIAN_DIGIT_INCREMENT) : \ |
| michael@0 | 28 | (c))) |
| michael@0 | 29 | |
| michael@0 | 30 | char16_t HandleNumberInChar(char16_t aChar, bool aPrevCharArabic, uint32_t aNumFlag) |
| michael@0 | 31 | { |
| michael@0 | 32 | // IBMBIDI_NUMERAL_NOMINAL * |
| michael@0 | 33 | // IBMBIDI_NUMERAL_REGULAR |
| michael@0 | 34 | // IBMBIDI_NUMERAL_HINDICONTEXT |
| michael@0 | 35 | // IBMBIDI_NUMERAL_ARABIC |
| michael@0 | 36 | // IBMBIDI_NUMERAL_HINDI |
| michael@0 | 37 | |
| michael@0 | 38 | switch (aNumFlag) { |
| michael@0 | 39 | case IBMBIDI_NUMERAL_HINDI: |
| michael@0 | 40 | return NUM_TO_HINDI(aChar); |
| michael@0 | 41 | case IBMBIDI_NUMERAL_ARABIC: |
| michael@0 | 42 | return NUM_TO_ARABIC(aChar); |
| michael@0 | 43 | case IBMBIDI_NUMERAL_PERSIAN: |
| michael@0 | 44 | return NUM_TO_PERSIAN(aChar); |
| michael@0 | 45 | case IBMBIDI_NUMERAL_REGULAR: |
| michael@0 | 46 | case IBMBIDI_NUMERAL_HINDICONTEXT: |
| michael@0 | 47 | case IBMBIDI_NUMERAL_PERSIANCONTEXT: |
| michael@0 | 48 | // for clipboard handling |
| michael@0 | 49 | //XXX do we really want to convert numerals when copying text? |
| michael@0 | 50 | if (aPrevCharArabic) { |
| michael@0 | 51 | if (aNumFlag == IBMBIDI_NUMERAL_PERSIANCONTEXT) |
| michael@0 | 52 | return NUM_TO_PERSIAN(aChar); |
| michael@0 | 53 | else |
| michael@0 | 54 | return NUM_TO_HINDI(aChar); |
| michael@0 | 55 | } |
| michael@0 | 56 | else |
| michael@0 | 57 | return NUM_TO_ARABIC(aChar); |
| michael@0 | 58 | case IBMBIDI_NUMERAL_NOMINAL: |
| michael@0 | 59 | default: |
| michael@0 | 60 | return aChar; |
| michael@0 | 61 | } |
| michael@0 | 62 | } |
| michael@0 | 63 | |
| michael@0 | 64 | nsresult HandleNumbers(char16_t* aBuffer, uint32_t aSize, uint32_t aNumFlag) |
| michael@0 | 65 | { |
| michael@0 | 66 | uint32_t i; |
| michael@0 | 67 | |
| michael@0 | 68 | switch (aNumFlag) { |
| michael@0 | 69 | case IBMBIDI_NUMERAL_HINDI: |
| michael@0 | 70 | case IBMBIDI_NUMERAL_ARABIC: |
| michael@0 | 71 | case IBMBIDI_NUMERAL_PERSIAN: |
| michael@0 | 72 | case IBMBIDI_NUMERAL_REGULAR: |
| michael@0 | 73 | case IBMBIDI_NUMERAL_HINDICONTEXT: |
| michael@0 | 74 | case IBMBIDI_NUMERAL_PERSIANCONTEXT: |
| michael@0 | 75 | for (i=0;i<aSize;i++) |
| michael@0 | 76 | aBuffer[i] = HandleNumberInChar(aBuffer[i], !!(i>0 ? aBuffer[i-1] : 0), aNumFlag); |
| michael@0 | 77 | break; |
| michael@0 | 78 | case IBMBIDI_NUMERAL_NOMINAL: |
| michael@0 | 79 | default: |
| michael@0 | 80 | break; |
| michael@0 | 81 | } |
| michael@0 | 82 | return NS_OK; |
| michael@0 | 83 | } |
| michael@0 | 84 | |
| michael@0 | 85 | bool HasRTLChars(const nsAString& aString) |
| michael@0 | 86 | { |
| michael@0 | 87 | // This is used to determine whether to enable bidi if a string has |
| michael@0 | 88 | // right-to-left characters. To simplify things, anything that could be a |
| michael@0 | 89 | // surrogate or RTL presentation form is covered just by testing >= 0xD800). |
| michael@0 | 90 | // It's fine to enable bidi in rare cases where it actually isn't needed. |
| michael@0 | 91 | int32_t length = aString.Length(); |
| michael@0 | 92 | for (int32_t i = 0; i < length; i++) { |
| michael@0 | 93 | char16_t ch = aString.CharAt(i); |
| michael@0 | 94 | if (ch >= 0xD800 || IS_IN_BMP_RTL_BLOCK(ch)) { |
| michael@0 | 95 | return true; |
| michael@0 | 96 | } |
| michael@0 | 97 | } |
| michael@0 | 98 | return false; |
| michael@0 | 99 | } |
