private static bool StartsWithRtlCharacter(StringSlice slice)
{
for (int i = slice.Start; i <= slice.End; i++)
{
char c = slice[i];
if (c < 128)
{
if (CharHelper.IsAlpha(c))
{
return(false);
}
continue;
}
int rune = c;
if (CharHelper.IsHighSurrogate(c) && i < slice.End && CharHelper.IsLowSurrogate(slice[i + 1]))
{
Debug.Assert(char.IsSurrogatePair(c, slice[i + 1]));
rune = char.ConvertToUtf32(c, slice[i + 1]);
i++;
}
if (CharHelper.IsRightToLeft(rune))
{
return(true);
}
if (CharHelper.IsLeftToRight(rune))
{
return(false);
}
}
return(false);
}