100 lines
3.4 KiB
C++
100 lines
3.4 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "nsBidiUtils.h"
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#define ARABIC_TO_HINDI_DIGIT_INCREMENT (START_HINDI_DIGITS - START_ARABIC_DIGITS)
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#define PERSIAN_TO_HINDI_DIGIT_INCREMENT (START_HINDI_DIGITS - START_FARSI_DIGITS)
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#define ARABIC_TO_PERSIAN_DIGIT_INCREMENT (START_FARSI_DIGITS - START_ARABIC_DIGITS)
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#define NUM_TO_ARABIC(c) \
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((((c)>=START_HINDI_DIGITS) && ((c)<=END_HINDI_DIGITS)) ? \
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((c) - (uint16_t)ARABIC_TO_HINDI_DIGIT_INCREMENT) : \
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((((c)>=START_FARSI_DIGITS) && ((c)<=END_FARSI_DIGITS)) ? \
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((c) - (uint16_t)ARABIC_TO_PERSIAN_DIGIT_INCREMENT) : \
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(c)))
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#define NUM_TO_HINDI(c) \
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((((c)>=START_ARABIC_DIGITS) && ((c)<=END_ARABIC_DIGITS)) ? \
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((c) + (uint16_t)ARABIC_TO_HINDI_DIGIT_INCREMENT): \
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((((c)>=START_FARSI_DIGITS) && ((c)<=END_FARSI_DIGITS)) ? \
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((c) + (uint16_t)PERSIAN_TO_HINDI_DIGIT_INCREMENT) : \
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(c)))
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#define NUM_TO_PERSIAN(c) \
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((((c)>=START_HINDI_DIGITS) && ((c)<=END_HINDI_DIGITS)) ? \
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((c) - (uint16_t)PERSIAN_TO_HINDI_DIGIT_INCREMENT) : \
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((((c)>=START_ARABIC_DIGITS) && ((c)<=END_ARABIC_DIGITS)) ? \
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((c) + (uint16_t)ARABIC_TO_PERSIAN_DIGIT_INCREMENT) : \
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(c)))
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char16_t HandleNumberInChar(char16_t aChar, bool aPrevCharArabic, uint32_t aNumFlag)
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{
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// IBMBIDI_NUMERAL_NOMINAL *
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// IBMBIDI_NUMERAL_REGULAR
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// IBMBIDI_NUMERAL_HINDICONTEXT
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// IBMBIDI_NUMERAL_ARABIC
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// IBMBIDI_NUMERAL_HINDI
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switch (aNumFlag) {
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case IBMBIDI_NUMERAL_HINDI:
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return NUM_TO_HINDI(aChar);
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case IBMBIDI_NUMERAL_ARABIC:
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return NUM_TO_ARABIC(aChar);
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case IBMBIDI_NUMERAL_PERSIAN:
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return NUM_TO_PERSIAN(aChar);
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case IBMBIDI_NUMERAL_REGULAR:
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case IBMBIDI_NUMERAL_HINDICONTEXT:
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case IBMBIDI_NUMERAL_PERSIANCONTEXT:
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// for clipboard handling
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//XXX do we really want to convert numerals when copying text?
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if (aPrevCharArabic) {
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if (aNumFlag == IBMBIDI_NUMERAL_PERSIANCONTEXT)
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return NUM_TO_PERSIAN(aChar);
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else
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return NUM_TO_HINDI(aChar);
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}
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else
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return NUM_TO_ARABIC(aChar);
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case IBMBIDI_NUMERAL_NOMINAL:
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default:
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return aChar;
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}
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}
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nsresult HandleNumbers(char16_t* aBuffer, uint32_t aSize, uint32_t aNumFlag)
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{
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uint32_t i;
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switch (aNumFlag) {
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case IBMBIDI_NUMERAL_HINDI:
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case IBMBIDI_NUMERAL_ARABIC:
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case IBMBIDI_NUMERAL_PERSIAN:
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case IBMBIDI_NUMERAL_REGULAR:
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case IBMBIDI_NUMERAL_HINDICONTEXT:
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case IBMBIDI_NUMERAL_PERSIANCONTEXT:
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for (i=0;i<aSize;i++)
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aBuffer[i] = HandleNumberInChar(aBuffer[i], !!(i>0 ? aBuffer[i-1] : 0), aNumFlag);
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break;
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case IBMBIDI_NUMERAL_NOMINAL:
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default:
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break;
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}
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return NS_OK;
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}
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bool HasRTLChars(const nsAString& aString)
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{
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// This is used to determine whether to enable bidi if a string has
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// right-to-left characters. To simplify things, anything that could be a
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// surrogate or RTL presentation form is covered just by testing >= 0xD800).
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// It's fine to enable bidi in rare cases where it actually isn't needed.
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int32_t length = aString.Length();
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for (int32_t i = 0; i < length; i++) {
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char16_t ch = aString.CharAt(i);
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if (ch >= 0xD800 || IS_IN_BMP_RTL_BLOCK(ch)) {
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return true;
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}
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}
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return false;
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}
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