private unsafe static bool TryWriteEncodedScalarAsNumericEntity(int unicodeScalar, char *buffer, int length, out int numberOfCharactersWritten)
{
Debug.Assert(buffer != null && length >= 0);
if (UnicodeHelpers.IsSupplementaryCodePoint(unicodeScalar))
{
// Convert this back to UTF-16 and write out both characters.
char leadingSurrogate, trailingSurrogate;
UnicodeHelpers.GetUtf16SurrogatePairFromAstralScalarValue(unicodeScalar, out leadingSurrogate, out trailingSurrogate);
int leadingSurrogateCharactersWritten;
if (TryWriteEncodedSingleCharacter(leadingSurrogate, buffer, length, out leadingSurrogateCharactersWritten) &&
TryWriteEncodedSingleCharacter(trailingSurrogate, buffer + leadingSurrogateCharactersWritten, length - leadingSurrogateCharactersWritten, out numberOfCharactersWritten)
)
{
numberOfCharactersWritten += leadingSurrogateCharactersWritten;
return(true);
}
else
{
numberOfCharactersWritten = 0;
return(false);
}
}
else
{
// This is only a single character.
return(TryWriteEncodedSingleCharacter(unicodeScalar, buffer, length, out numberOfCharactersWritten));
}
}
// Writes a scalar value as an JavaScript-escaped character (or sequence of characters).
private static void WriteEncodedScalarAsNumericEntity(ref Writer writer, uint value)
{
if (UnicodeHelpers.IsSupplementaryCodePoint((int)value))
{
// Convert this back to UTF-16 and write out both characters.
char leadingSurrogate, trailingSurrogate;
UnicodeHelpers.GetUtf16SurrogatePairFromAstralScalarValue((int)value, out leadingSurrogate, out trailingSurrogate);
WriteEncodedSingleCharacter(ref writer, leadingSurrogate);
WriteEncodedSingleCharacter(ref writer, trailingSurrogate);
}
else
{
// This is only a single character.
WriteEncodedSingleCharacter(ref writer, value);
}
}