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nsBidiUtils.cpp (3278B)

      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 \
      9  (START_HINDI_DIGITS - START_ARABIC_DIGITS)
     10 #define PERSIAN_TO_HINDI_DIGIT_INCREMENT \
     11  (START_HINDI_DIGITS - START_FARSI_DIGITS)
     12 #define ARABIC_TO_PERSIAN_DIGIT_INCREMENT \
     13  (START_FARSI_DIGITS - START_ARABIC_DIGITS)
     14 #define NUM_TO_ARABIC(c)                                             \
     15  ((((c) >= START_HINDI_DIGITS) && ((c) <= END_HINDI_DIGITS))        \
     16       ? ((c) - (uint16_t)ARABIC_TO_HINDI_DIGIT_INCREMENT)           \
     17       : ((((c) >= START_FARSI_DIGITS) && ((c) <= END_FARSI_DIGITS)) \
     18              ? ((c) - (uint16_t)ARABIC_TO_PERSIAN_DIGIT_INCREMENT)  \
     19              : (c)))
     20 #define NUM_TO_HINDI(c)                                              \
     21  ((((c) >= START_ARABIC_DIGITS) && ((c) <= END_ARABIC_DIGITS))      \
     22       ? ((c) + (uint16_t)ARABIC_TO_HINDI_DIGIT_INCREMENT)           \
     23       : ((((c) >= START_FARSI_DIGITS) && ((c) <= END_FARSI_DIGITS)) \
     24              ? ((c) + (uint16_t)PERSIAN_TO_HINDI_DIGIT_INCREMENT)   \
     25              : (c)))
     26 #define NUM_TO_PERSIAN(c)                                              \
     27  ((((c) >= START_HINDI_DIGITS) && ((c) <= END_HINDI_DIGITS))          \
     28       ? ((c) - (uint16_t)PERSIAN_TO_HINDI_DIGIT_INCREMENT)            \
     29       : ((((c) >= START_ARABIC_DIGITS) && ((c) <= END_ARABIC_DIGITS)) \
     30              ? ((c) + (uint16_t)ARABIC_TO_PERSIAN_DIGIT_INCREMENT)    \
     31              : (c)))
     32 
     33 char16_t HandleNumberInChar(char16_t aChar, bool aPrevCharArabic,
     34                            uint32_t aNumFlag) {
     35  // IBMBIDI_NUMERAL_NOMINAL *
     36  // IBMBIDI_NUMERAL_REGULAR
     37  // IBMBIDI_NUMERAL_HINDICONTEXT
     38  // IBMBIDI_NUMERAL_ARABIC
     39  // IBMBIDI_NUMERAL_HINDI
     40 
     41  switch (aNumFlag) {
     42    case IBMBIDI_NUMERAL_HINDI:
     43      return NUM_TO_HINDI(aChar);
     44    case IBMBIDI_NUMERAL_ARABIC:
     45      return NUM_TO_ARABIC(aChar);
     46    case IBMBIDI_NUMERAL_PERSIAN:
     47      return NUM_TO_PERSIAN(aChar);
     48    case IBMBIDI_NUMERAL_REGULAR:
     49    case IBMBIDI_NUMERAL_HINDICONTEXT:
     50    case IBMBIDI_NUMERAL_PERSIANCONTEXT:
     51      // for clipboard handling
     52      // XXX do we really want to convert numerals when copying text?
     53      if (aPrevCharArabic) {
     54        return aNumFlag == IBMBIDI_NUMERAL_PERSIANCONTEXT
     55                   ? NUM_TO_PERSIAN(aChar)
     56                   : NUM_TO_HINDI(aChar);
     57      }
     58      return NUM_TO_ARABIC(aChar);
     59    case IBMBIDI_NUMERAL_NOMINAL:
     60    default:
     61      return aChar;
     62  }
     63 }
     64 
     65 nsresult HandleNumbers(char16_t* aBuffer, uint32_t aSize, uint32_t aNumFlag) {
     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(
     77            aBuffer[i], !!(i > 0 ? aBuffer[i - 1] : 0), aNumFlag);
     78      break;
     79    case IBMBIDI_NUMERAL_NOMINAL:
     80    default:
     81      break;
     82  }
     83  return NS_OK;
     84 }