1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/intl/unicharutil/util/nsBidiUtils.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,99 @@
1.4 +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
1.5 + *
1.6 + * This Source Code Form is subject to the terms of the Mozilla Public
1.7 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.8 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.9 +#include "nsBidiUtils.h"
1.10 +
1.11 +#define ARABIC_TO_HINDI_DIGIT_INCREMENT (START_HINDI_DIGITS - START_ARABIC_DIGITS)
1.12 +#define PERSIAN_TO_HINDI_DIGIT_INCREMENT (START_HINDI_DIGITS - START_FARSI_DIGITS)
1.13 +#define ARABIC_TO_PERSIAN_DIGIT_INCREMENT (START_FARSI_DIGITS - START_ARABIC_DIGITS)
1.14 +#define NUM_TO_ARABIC(c) \
1.15 + ((((c)>=START_HINDI_DIGITS) && ((c)<=END_HINDI_DIGITS)) ? \
1.16 + ((c) - (uint16_t)ARABIC_TO_HINDI_DIGIT_INCREMENT) : \
1.17 + ((((c)>=START_FARSI_DIGITS) && ((c)<=END_FARSI_DIGITS)) ? \
1.18 + ((c) - (uint16_t)ARABIC_TO_PERSIAN_DIGIT_INCREMENT) : \
1.19 + (c)))
1.20 +#define NUM_TO_HINDI(c) \
1.21 + ((((c)>=START_ARABIC_DIGITS) && ((c)<=END_ARABIC_DIGITS)) ? \
1.22 + ((c) + (uint16_t)ARABIC_TO_HINDI_DIGIT_INCREMENT): \
1.23 + ((((c)>=START_FARSI_DIGITS) && ((c)<=END_FARSI_DIGITS)) ? \
1.24 + ((c) + (uint16_t)PERSIAN_TO_HINDI_DIGIT_INCREMENT) : \
1.25 + (c)))
1.26 +#define NUM_TO_PERSIAN(c) \
1.27 + ((((c)>=START_HINDI_DIGITS) && ((c)<=END_HINDI_DIGITS)) ? \
1.28 + ((c) - (uint16_t)PERSIAN_TO_HINDI_DIGIT_INCREMENT) : \
1.29 + ((((c)>=START_ARABIC_DIGITS) && ((c)<=END_ARABIC_DIGITS)) ? \
1.30 + ((c) + (uint16_t)ARABIC_TO_PERSIAN_DIGIT_INCREMENT) : \
1.31 + (c)))
1.32 +
1.33 +char16_t HandleNumberInChar(char16_t aChar, bool aPrevCharArabic, uint32_t aNumFlag)
1.34 +{
1.35 + // IBMBIDI_NUMERAL_NOMINAL *
1.36 + // IBMBIDI_NUMERAL_REGULAR
1.37 + // IBMBIDI_NUMERAL_HINDICONTEXT
1.38 + // IBMBIDI_NUMERAL_ARABIC
1.39 + // IBMBIDI_NUMERAL_HINDI
1.40 +
1.41 + switch (aNumFlag) {
1.42 + case IBMBIDI_NUMERAL_HINDI:
1.43 + return NUM_TO_HINDI(aChar);
1.44 + case IBMBIDI_NUMERAL_ARABIC:
1.45 + return NUM_TO_ARABIC(aChar);
1.46 + case IBMBIDI_NUMERAL_PERSIAN:
1.47 + return NUM_TO_PERSIAN(aChar);
1.48 + case IBMBIDI_NUMERAL_REGULAR:
1.49 + case IBMBIDI_NUMERAL_HINDICONTEXT:
1.50 + case IBMBIDI_NUMERAL_PERSIANCONTEXT:
1.51 + // for clipboard handling
1.52 + //XXX do we really want to convert numerals when copying text?
1.53 + if (aPrevCharArabic) {
1.54 + if (aNumFlag == IBMBIDI_NUMERAL_PERSIANCONTEXT)
1.55 + return NUM_TO_PERSIAN(aChar);
1.56 + else
1.57 + return NUM_TO_HINDI(aChar);
1.58 + }
1.59 + else
1.60 + return NUM_TO_ARABIC(aChar);
1.61 + case IBMBIDI_NUMERAL_NOMINAL:
1.62 + default:
1.63 + return aChar;
1.64 + }
1.65 +}
1.66 +
1.67 +nsresult HandleNumbers(char16_t* aBuffer, uint32_t aSize, uint32_t aNumFlag)
1.68 +{
1.69 + uint32_t i;
1.70 +
1.71 + switch (aNumFlag) {
1.72 + case IBMBIDI_NUMERAL_HINDI:
1.73 + case IBMBIDI_NUMERAL_ARABIC:
1.74 + case IBMBIDI_NUMERAL_PERSIAN:
1.75 + case IBMBIDI_NUMERAL_REGULAR:
1.76 + case IBMBIDI_NUMERAL_HINDICONTEXT:
1.77 + case IBMBIDI_NUMERAL_PERSIANCONTEXT:
1.78 + for (i=0;i<aSize;i++)
1.79 + aBuffer[i] = HandleNumberInChar(aBuffer[i], !!(i>0 ? aBuffer[i-1] : 0), aNumFlag);
1.80 + break;
1.81 + case IBMBIDI_NUMERAL_NOMINAL:
1.82 + default:
1.83 + break;
1.84 + }
1.85 + return NS_OK;
1.86 +}
1.87 +
1.88 +bool HasRTLChars(const nsAString& aString)
1.89 +{
1.90 +// This is used to determine whether to enable bidi if a string has
1.91 +// right-to-left characters. To simplify things, anything that could be a
1.92 +// surrogate or RTL presentation form is covered just by testing >= 0xD800).
1.93 +// It's fine to enable bidi in rare cases where it actually isn't needed.
1.94 + int32_t length = aString.Length();
1.95 + for (int32_t i = 0; i < length; i++) {
1.96 + char16_t ch = aString.CharAt(i);
1.97 + if (ch >= 0xD800 || IS_IN_BMP_RTL_BLOCK(ch)) {
1.98 + return true;
1.99 + }
1.100 + }
1.101 + return false;
1.102 +}
