1 files changed, 43 insertions, 0 deletions
diff --git a/intl/lwbrk/nsCarbonBreaker.cpp b/intl/lwbrk/nsCarbonBreaker.cpp
new file mode 100644
index 0000000000..d1d81b2578
--- /dev/null
+++ b/intl/lwbrk/nsCarbonBreaker.cpp
@@ -0,0 +1,43 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include <CoreFoundation/CoreFoundation.h>
+#include <stdint.h>
+#include "nsDebug.h"
+#include "nscore.h"
+
+void NS_GetComplexLineBreaks(const char16_t* aText, uint32_t aLength,
+                             uint8_t* aBreakBefore) {
+  NS_ASSERTION(aText, "aText shouldn't be null");
+
+  memset(aBreakBefore, 0, aLength * sizeof(uint8_t));
+
+  CFStringRef str = ::CFStringCreateWithCharactersNoCopy(
+      kCFAllocatorDefault, reinterpret_cast<const UniChar*>(aText), aLength,
+      kCFAllocatorNull);
+  if (!str) {
+    return;
+  }
+
+  CFStringTokenizerRef st = ::CFStringTokenizerCreate(
+      kCFAllocatorDefault, str, ::CFRangeMake(0, aLength),
+      kCFStringTokenizerUnitLineBreak, nullptr);
+  if (!st) {
+    ::CFRelease(str);
+    return;
+  }
+
+  CFStringTokenizerTokenType tt = ::CFStringTokenizerAdvanceToNextToken(st);
+  while (tt != kCFStringTokenizerTokenNone) {
+    CFRange r = ::CFStringTokenizerGetCurrentTokenRange(st);
+    if (r.location != 0) {  // Ignore leading edge
+      aBreakBefore[r.location] = true;
+    }
+    tt = CFStringTokenizerAdvanceToNextToken(st);
+  }
+
+  ::CFRelease(st);
+  ::CFRelease(str);
+}