/// <summary>
/// Constructs a new JsonParseException
/// </summary>
/// <param name="inner">The inner exception</param>
/// <param name="context">A string describing the context of the serialization (parent key path)</param>
/// <param name="position">The position in the JSON stream where the error occured</param>
public JsonParseException(Exception inner, string context, LineOffset position) :
base(string.Format("JSON parse error at {0}{1} - {2}", position, string.IsNullOrEmpty(context) ? "" : string.Format(", context {0}", context), inner.Message), inner)
{
Position = position;
Context = context;
}
// Read the next token from the input stream
// (Mostly inline for performance)
public void NextToken()
{
while (true)
{
// Skip whitespace and handle line numbers
while (true)
{
if (_currentChar == '\r')
{
if (NextChar() == '\n')
{
NextChar();
}
_currentCharPos.Line++;
_currentCharPos.Offset = 0;
}
else if (_currentChar == '\n')
{
if (NextChar() == '\r')
{
NextChar();
}
_currentCharPos.Line++;
_currentCharPos.Offset = 0;
}
else if (_currentChar == ' ')
{
NextChar();
}
else if (_currentChar == '\t')
{
NextChar();
}
else
{
break;
}
}
// Remember position of token
CurrentTokenPosition = _currentCharPos;
// Handle common characters first
switch (_currentChar)
{
case '/':
// Comments not support in strict mode
if ((_options & JsonOptions.StrictParser) != 0)
{
throw new InvalidDataException(string.Format("syntax error, unexpected character '{0}'", _currentChar));
}
// Process comment
NextChar();
switch (_currentChar)
{
case '/':
NextChar();
while (_currentChar != '\0' && _currentChar != '\r' && _currentChar != '\n')
{
NextChar();
}
break;
case '*':
bool endFound = false;
while (!endFound && _currentChar != '\0')
{
if (_currentChar == '*')
{
NextChar();
if (_currentChar == '/')
{
endFound = true;
}
}
NextChar();
}
break;
default:
throw new InvalidDataException("syntax error, unexpected character after slash");
}
continue;
case '\"':
case '\'':
{
_sb.Length = 0;
var quoteKind = _currentChar;
NextChar();
while (_currentChar != '\0')
{
if (_currentChar == '\\')
{
NextChar();
var escape = _currentChar;
switch (escape)
{
case '\"': _sb.Append('\"'); break;
case '\\': _sb.Append('\\'); break;
case '/': _sb.Append('/'); break;
case 'b': _sb.Append('\b'); break;
case 'f': _sb.Append('\f'); break;
case 'n': _sb.Append('\n'); break;
case 'r': _sb.Append('\r'); break;
case 't': _sb.Append('\t'); break;
case 'u':
var sbHex = new StringBuilder();
for (int i = 0; i < 4; i++)
{
NextChar();
sbHex.Append(_currentChar);
}
_sb.Append((char)Convert.ToUInt16(sbHex.ToString(), 16));
break;
default:
throw new InvalidDataException(string.Format("Invalid escape sequence in string literal: '\\{0}'", _currentChar));
}
}
else if (_currentChar == quoteKind)
{
String = _sb.ToString();
CurrentToken = Token.Literal;
LiteralKind = LiteralKind.String;
NextChar();
return;
}
else
{
_sb.Append(_currentChar);
}
NextChar();
}
throw new InvalidDataException("syntax error, unterminated string literal");
}
case '{': CurrentToken = Token.OpenBrace; NextChar(); return;
case '}': CurrentToken = Token.CloseBrace; NextChar(); return;
case '[': CurrentToken = Token.OpenSquare; NextChar(); return;
case ']': CurrentToken = Token.CloseSquare; NextChar(); return;
case '=': CurrentToken = Token.Equal; NextChar(); return;
case ':': CurrentToken = Token.Colon; NextChar(); return;
case ';': CurrentToken = Token.SemiColon; NextChar(); return;
case ',': CurrentToken = Token.Comma; NextChar(); return;
case '\0': CurrentToken = Token.EOF; return;
}
// Number?
if (char.IsDigit(_currentChar) || _currentChar == '-')
{
TokenizeNumber();
return;
}
// Identifier? (checked for after everything else as identifiers are actually quite rare in valid json)
if (Char.IsLetter(_currentChar) || _currentChar == '_' || _currentChar == '$')
{
// Find end of identifier
_sb.Length = 0;
while (Char.IsLetterOrDigit(_currentChar) || _currentChar == '_' || _currentChar == '$')
{
_sb.Append(_currentChar);
NextChar();
}
String = _sb.ToString();
// Handle special identifiers
switch (String)
{
case "true":
LiteralKind = LiteralKind.True;
CurrentToken = Token.Literal;
return;
case "false":
LiteralKind = LiteralKind.False;
CurrentToken = Token.Literal;
return;
case "null":
LiteralKind = LiteralKind.Null;
CurrentToken = Token.Literal;
return;
}
CurrentToken = Token.Identifier;
return;
}
// What the?
throw new InvalidDataException(string.Format("syntax error, unexpected character '{0}'", _currentChar));
}
}
