intl/lwbrk/nsCarbonBreaker.cpp

   1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* This Source Code Form is subject to the terms of the Mozilla Public
   3  * License, v. 2.0. If a copy of the MPL was not distributed with this
   4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   5
   6 #include <CoreFoundation/CoreFoundation.h>
   7 #include <stdint.h>
   8 #include "nsDebug.h"
   9 #include "nscore.h"
  10
  11 void NS_GetComplexLineBreaks(const char16_t* aText, uint32_t aLength,
  12                              uint8_t* aBreakBefore) {
  13   NS_ASSERTION(aText, "aText shouldn't be null");
  14
  15   memset(aBreakBefore, 0, aLength * sizeof(uint8_t));
  16
  17   CFStringRef str = ::CFStringCreateWithCharactersNoCopy(
  18       kCFAllocatorDefault, reinterpret_cast<const UniChar*>(aText), aLength,
  19       kCFAllocatorNull);
  20   if (!str) {
  21     return;
  22   }
  23
  24   CFStringTokenizerRef st = ::CFStringTokenizerCreate(
  25       kCFAllocatorDefault, str, ::CFRangeMake(0, aLength),
  26       kCFStringTokenizerUnitLineBreak, nullptr);
  27   if (!st) {
  28     ::CFRelease(str);
  29     return;
  30   }
  31
  32   CFStringTokenizerTokenType tt = ::CFStringTokenizerAdvanceToNextToken(st);
  33   while (tt != kCFStringTokenizerTokenNone) {
  34     CFRange r = ::CFStringTokenizerGetCurrentTokenRange(st);
  35     if (r.location != 0) {  // Ignore leading edge
  36       aBreakBefore[r.location] = true;
  37     }
  38     tt = CFStringTokenizerAdvanceToNextToken(st);
  39   }
  40
  41   ::CFRelease(st);
  42   ::CFRelease(str);
  43 }