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