private static bool StartsWithRtlCharacter(StringSlice slice)
{
for (int i = slice.Start; i <= slice.End; i++)
{
if (slice[i] < 128)
{
continue;
}
int rune;
if (CharHelper.IsHighSurrogate(slice[i]) && i < slice.End && CharHelper.IsLowSurrogate(slice[i + 1]))
{
Debug.Assert(char.IsSurrogatePair(slice[i], slice[i + 1]));
rune = char.ConvertToUtf32(slice[i], slice[i + 1]);
}
else
{
rune = slice[i];
}
if (CharHelper.IsRightToLeft(rune))
{
return(true);
}
if (CharHelper.IsLeftToRight(rune))
{
return(false);
}
}
return(false);
}
public static bool IsNameStartChar(char c, char d)
{
if (CharHelper.IsHighSurrogate(c) && CharHelper.IsLowSurrogate(d))
{
int codepoint = CharHelper.ConvertToUtf32(c, d);
return(codepoint >= 0x10000 && codepoint <= 0xeffff);
}
else
{
return(false);
}
}