1 files changed, 99 insertions, 0 deletions
diff --git a/intl/unicharutil/util/nsBidiUtils.cpp b/intl/unicharutil/util/nsBidiUtils.cpp
new file mode 100644
index 000000000..8c186ac68
--- /dev/null
+++ b/intl/unicharutil/util/nsBidiUtils.cpp
@@ -0,0 +1,99 @@
+/* -*- 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 "nsBidiUtils.h"
+
+#define ARABIC_TO_HINDI_DIGIT_INCREMENT (START_HINDI_DIGITS - START_ARABIC_DIGITS)
+#define PERSIAN_TO_HINDI_DIGIT_INCREMENT (START_HINDI_DIGITS - START_FARSI_DIGITS)
+#define ARABIC_TO_PERSIAN_DIGIT_INCREMENT (START_FARSI_DIGITS - START_ARABIC_DIGITS)
+#define NUM_TO_ARABIC(c) \
+  ((((c)>=START_HINDI_DIGITS) && ((c)<=END_HINDI_DIGITS)) ? \
+   ((c) - (uint16_t)ARABIC_TO_HINDI_DIGIT_INCREMENT) : \
+   ((((c)>=START_FARSI_DIGITS) && ((c)<=END_FARSI_DIGITS)) ? \
+    ((c) - (uint16_t)ARABIC_TO_PERSIAN_DIGIT_INCREMENT) : \
+     (c)))
+#define NUM_TO_HINDI(c) \
+  ((((c)>=START_ARABIC_DIGITS) && ((c)<=END_ARABIC_DIGITS)) ? \
+   ((c) + (uint16_t)ARABIC_TO_HINDI_DIGIT_INCREMENT): \
+   ((((c)>=START_FARSI_DIGITS) && ((c)<=END_FARSI_DIGITS)) ? \
+    ((c) + (uint16_t)PERSIAN_TO_HINDI_DIGIT_INCREMENT) : \
+     (c)))
+#define NUM_TO_PERSIAN(c) \
+  ((((c)>=START_HINDI_DIGITS) && ((c)<=END_HINDI_DIGITS)) ? \
+   ((c) - (uint16_t)PERSIAN_TO_HINDI_DIGIT_INCREMENT) : \
+   ((((c)>=START_ARABIC_DIGITS) && ((c)<=END_ARABIC_DIGITS)) ? \
+    ((c) + (uint16_t)ARABIC_TO_PERSIAN_DIGIT_INCREMENT) : \
+     (c)))
+
+char16_t HandleNumberInChar(char16_t aChar, bool aPrevCharArabic, uint32_t aNumFlag)
+{
+  // IBMBIDI_NUMERAL_NOMINAL *
+  // IBMBIDI_NUMERAL_REGULAR
+  // IBMBIDI_NUMERAL_HINDICONTEXT
+  // IBMBIDI_NUMERAL_ARABIC
+  // IBMBIDI_NUMERAL_HINDI
+
+  switch (aNumFlag) {
+    case IBMBIDI_NUMERAL_HINDI:
+      return NUM_TO_HINDI(aChar);
+    case IBMBIDI_NUMERAL_ARABIC:
+      return NUM_TO_ARABIC(aChar);
+    case IBMBIDI_NUMERAL_PERSIAN:
+      return NUM_TO_PERSIAN(aChar);
+    case IBMBIDI_NUMERAL_REGULAR:
+    case IBMBIDI_NUMERAL_HINDICONTEXT:
+    case IBMBIDI_NUMERAL_PERSIANCONTEXT:
+      // for clipboard handling
+      //XXX do we really want to convert numerals when copying text?
+      if (aPrevCharArabic) {
+        if (aNumFlag == IBMBIDI_NUMERAL_PERSIANCONTEXT)
+          return NUM_TO_PERSIAN(aChar);
+        else
+          return NUM_TO_HINDI(aChar);
+      }
+      else
+        return NUM_TO_ARABIC(aChar);
+    case IBMBIDI_NUMERAL_NOMINAL:
+    default:
+      return aChar;
+  }
+}
+
+nsresult HandleNumbers(char16_t* aBuffer, uint32_t aSize, uint32_t aNumFlag)
+{
+  uint32_t i;
+
+  switch (aNumFlag) {
+    case IBMBIDI_NUMERAL_HINDI:
+    case IBMBIDI_NUMERAL_ARABIC:
+    case IBMBIDI_NUMERAL_PERSIAN:
+    case IBMBIDI_NUMERAL_REGULAR:
+    case IBMBIDI_NUMERAL_HINDICONTEXT:
+    case IBMBIDI_NUMERAL_PERSIANCONTEXT:
+      for (i=0;i<aSize;i++)
+        aBuffer[i] = HandleNumberInChar(aBuffer[i], !!(i>0 ? aBuffer[i-1] : 0), aNumFlag);
+      break;
+    case IBMBIDI_NUMERAL_NOMINAL:
+    default:
+      break;
+  }
+  return NS_OK;
+}
+
+bool HasRTLChars(const nsAString& aString)
+{
+// This is used to determine whether to enable bidi if a string has 
+// right-to-left characters. To simplify things, anything that could be a
+// surrogate or RTL presentation form is covered just by testing >= 0xD800).
+// It's fine to enable bidi in rare cases where it actually isn't needed.
+  int32_t length = aString.Length();
+  for (int32_t i = 0; i < length; i++) {
+    char16_t ch = aString.CharAt(i);
+    if (ch >= 0xD800 || IS_IN_BMP_RTL_BLOCK(ch)) {
+      return true;
+    }
+  }
+  return false;
+}