private static void EscapeString(ReadOnlySpan <char> value, Span <char> destination, JavaScriptEncoder encoder, ref int written)
{
Debug.Assert(encoder != null);
OperationStatus result = encoder.Encode(value, destination, out int encoderBytesConsumed, out int encoderCharsWritten);
Debug.Assert(result != OperationStatus.DestinationTooSmall);
Debug.Assert(result != OperationStatus.NeedMoreData);
if (result != OperationStatus.Done)
{
ThrowHelper.ThrowArgumentException_InvalidUTF16(value[encoderCharsWritten]);
}
Debug.Assert(encoderBytesConsumed == value.Length);
written += encoderCharsWritten;
}
private static void EscapeNextChars(ReadOnlySpan <char> value, int firstChar, Span <char> destination, ref int consumed, ref int written)
{
int nextChar = -1;
if (IsInRangeInclusive(firstChar, JsonConstants.HighSurrogateStartValue, JsonConstants.LowSurrogateEndValue))
{
consumed++;
if (value.Length <= consumed || firstChar >= JsonConstants.LowSurrogateStartValue)
{
ThrowHelper.ThrowArgumentException_InvalidUTF16(firstChar);
}
nextChar = value[consumed];
if (!IsInRangeInclusive(nextChar, JsonConstants.LowSurrogateStartValue, JsonConstants.LowSurrogateEndValue))
{
ThrowHelper.ThrowArgumentException_InvalidUTF16(nextChar);
}
}
destination[written++] = '\\';
switch (firstChar)
{
case JsonConstants.LineFeed:
destination[written++] = 'n';
break;
case JsonConstants.CarriageReturn:
destination[written++] = 'r';
break;
case JsonConstants.Tab:
destination[written++] = 't';
break;
case JsonConstants.BackSlash:
destination[written++] = '\\';
break;
case JsonConstants.BackSpace:
destination[written++] = 'b';
break;
case JsonConstants.FormFeed:
destination[written++] = 'f';
break;
default:
destination[written++] = 'u';
#if BUILDING_INBOX_LIBRARY
firstChar.TryFormat(destination.Slice(written), out int charsWritten, HexFormatString);
Debug.Assert(charsWritten == 4);
written += charsWritten;
#else
written = WriteHex(firstChar, destination, written);
#endif
if (nextChar != -1)
{
destination[written++] = '\\';
destination[written++] = 'u';
#if BUILDING_INBOX_LIBRARY
nextChar.TryFormat(destination.Slice(written), out charsWritten, HexFormatString);
Debug.Assert(charsWritten == 4);
written += charsWritten;
#else
written = WriteHex(nextChar, destination, written);
#endif
}
break;
}
}
