PRBool HasRTLChars(nsAString& aString)
{
PRInt32 length = aString.Length();
for (PRInt32 i = 0; i < length; i++) {
if ((UCS2_CHAR_IS_BIDI(aString.CharAt(i)) ) ||
((NS_IS_HIGH_SURROGATE(aString.CharAt(i))) &&
(++i < length) &&
(NS_IS_LOW_SURROGATE(aString.CharAt(i))) &&
(UTF32_CHAR_IS_BIDI(SURROGATE_TO_UCS4(aString.CharAt(i-1),
aString.CharAt(i)))))) {
return PR_TRUE;
}
}
return PR_FALSE;
}
// To save time we only do this when we really want to know, not during
// every allocation
void
nsTextFragment::UpdateBidiFlag(const PRUnichar* aBuffer, PRUint32 aLength)
{
if (mState.mIs2b && !mState.mIsBidi) {
const PRUnichar* cp = aBuffer;
const PRUnichar* end = cp + aLength;
while (cp < end) {
PRUnichar ch1 = *cp++;
PRUint32 utf32Char = ch1;
if (NS_IS_HIGH_SURROGATE(ch1) &&
cp < end &&
NS_IS_LOW_SURROGATE(*cp)) {
PRUnichar ch2 = *cp++;
utf32Char = SURROGATE_TO_UCS4(ch1, ch2);
}
if (UTF32_CHAR_IS_BIDI(utf32Char) || IS_BIDI_CONTROL_CHAR(utf32Char)) {
mState.mIsBidi = PR_TRUE;
break;
}
}
}
}
// To save time we only do this when we really want to know, not during
// every allocation
void
nsTextFragment::UpdateBidiFlag(const char16_t* aBuffer, uint32_t aLength)
{
if (mState.mIs2b && !mState.mIsBidi) {
const char16_t* cp = aBuffer;
const char16_t* end = cp + aLength;
while (cp < end) {
char16_t ch1 = *cp++;
uint32_t utf32Char = ch1;
if (NS_IS_HIGH_SURROGATE(ch1) &&
cp < end &&
NS_IS_LOW_SURROGATE(*cp)) {
char16_t ch2 = *cp++;
utf32Char = SURROGATE_TO_UCS4(ch1, ch2);
}
if (UTF32_CHAR_IS_BIDI(utf32Char) || IsBidiControl(utf32Char)) {
mState.mIsBidi = true;
break;
}
}
}
}
