private static char ParseUnicode(JsonStream stream)
{
char unicodeCharacter;
try
{
unicodeCharacter = Convert.ToChar(int.Parse(new string(stream.Read(4)), NumberStyles.HexNumber));
}
catch
{
throw new UnexpectedJsonException();
}
return(unicodeCharacter);
}
/// <summary>
/// Attempts to read any string character from the <see cref="JsonStream"/> in sequence, until the
/// first end of string character is reached, or the stream is exhausted.
/// </summary>
/// <param name="stream">The <see cref="JsonStream"/> to read from.</param>
/// <returns>
/// The contents of the internal buffer as a string, as defined by the JSON
/// <a href="https://tools.ietf.org/html/rfc7159#section-8">RFC7591</a> specification.
/// </returns>
/// <exception cref="UnexpectedJsonException">
/// The <see cref="JsonStream"/> contains an unexpected unicode escape character and can't
/// be read any further.
/// </exception>
public string Read(JsonStream stream)
{
_readPosition = 0;
while (NotAtEndOfString(stream.Peek()))
{
if (EndOfBufferReached())
{
ExpandBufferAndPreserveContent();
}
if (StartOfEscapeSequence(stream.Peek()))
{
_buffer[_readPosition++] = ReadEscapeCharacter(stream);
}
else
{
_buffer[_readPosition++] = stream.Read();
}
}
return(new string(_buffer, 0, _readPosition));
}
private static char ReadEscapeCharacter(JsonStream stream)
{
stream.Expect(EscapeCharacter);
switch (stream.Read())
{
case '"':
return('\u0022');
case '\\':
return('\u005c');
case '/':
return('\u002f');
case 'b':
return('\u0008');
case 'f':
return('\u000c');
case 'n':
return('\u000a');
case 'r':
return('\u000d');
case 't':
return('\u0009');
case 'u':
return(ParseUnicode(stream));
default:
throw new UnexpectedJsonException();
}
}