private bool ParseNumber()
{
while (true)
{
if (_pos >= _bufSize)
{
return(false);
}
_charPos++;
var b = _inputBuffer[_pos++];
switch (b)
{
case (byte)'.':
if (_isDouble)
{
throw CreateException("Already got '.' in this number value");
}
_zeroPrefix = false; // 0.5, frex
_isDouble = true;
break;
case (byte)'+':
break; // just record, appears in 1.4e+3
case (byte)'e':
case (byte)'E':
if (_isExponent)
{
throw CreateException("Already got 'e' in this number value");
}
_isExponent = true;
_isDouble = true;
break;
case (byte)'-':
if (_isNegative)
{
throw CreateException("Already got '-' in this number value");
}
_isNegative = true;
break;
case (byte)'0':
case (byte)'1':
case (byte)'2':
case (byte)'3':
case (byte)'4':
case (byte)'5':
case (byte)'6':
case (byte)'7':
case (byte)'8':
case (byte)'9':
_state.Long *= 10;
_state.Long += b - (byte)'0';
break;
default:
switch (b)
{
case (byte)'\r':
case (byte)'\n':
_line++;
_charPos = 1;
goto case (byte)' ';
case (byte)' ':
case (byte)'\t':
case (byte)'\v':
case (byte)'\f':
case (byte)',':
case (byte)']':
case (byte)'}':
if (_zeroPrefix && _stringBuffer.SizeInBytes != 1)
{
throw CreateException("Invalid number with zero prefix");
}
if (_isNegative)
{
_state.Long *= -1;
}
_state.CurrentTokenType = _isDouble ? JsonParserToken.Float : JsonParserToken.Integer;
_pos--; _charPos--; // need to re-read this char
return(true);
default:
throw CreateException("Number cannot end with char with: '" + (char)b + "' (" + b + ")");
}
}
_stringBuffer.WriteByte(b);
}
}
private bool ContinueParsingValue()
{
switch (_state.Continuation)
{
case JsonParserTokenContinuation.PartialNegativeInfinity:
// here we need to check if we have a negative number or negative
// infinity
if (_expectedTokenBufferPosition == 1 &&
_inputBuffer[_pos] != (byte)'I')
{
_zeroPrefix = false;
_isNegative = true;
_isFractionedDouble = false;
_isOverflow = false;
_isExponent = false;
_state.Long = 0;
_state.EscapePositions.Clear();
_unmanagedWriteBuffer.Clear();
_unmanagedWriteBuffer.WriteByte((byte)'-');
_state.Continuation = JsonParserTokenContinuation.PartialNumber;
goto case JsonParserTokenContinuation.PartialNumber;
}
goto case JsonParserTokenContinuation.PartialPositiveInfinity;
case JsonParserTokenContinuation.PartialNaN:
case JsonParserTokenContinuation.PartialPositiveInfinity:
{
if (EnsureRestOfToken(ref _pos) == false)
{
return(false);
}
_state.Continuation = JsonParserTokenContinuation.None;
_state.CurrentTokenType = JsonParserToken.Float;
_unmanagedWriteBuffer.Write(_expectedTokenBuffer, 0, _expectedTokenBuffer.Length);
_unmanagedWriteBuffer.EnsureSingleChunk(_state);
return(true);
}
case JsonParserTokenContinuation.PartialNumber:
{
if (ParseNumber(ref _state.Long, ref _pos) == false)
{
return(false);
}
if (_state.CurrentTokenType == JsonParserToken.Float)
{
_unmanagedWriteBuffer.EnsureSingleChunk(_state);
}
_state.Continuation = JsonParserTokenContinuation.None;
return(true);
}
case JsonParserTokenContinuation.PartialPreamble:
{
if (EnsureRestOfToken(ref _pos) == false)
{
return(false);
}
_state.Continuation = JsonParserTokenContinuation.None;
return(false);
}
case JsonParserTokenContinuation.PartialString:
{
if (ParseString(ref _pos) == false)
{
return(false);
}
_unmanagedWriteBuffer.EnsureSingleChunk(_state);
_state.CurrentTokenType = JsonParserToken.String;
_state.Continuation = JsonParserTokenContinuation.None;
return(true);
}
case JsonParserTokenContinuation.PartialFalse:
{
if (EnsureRestOfToken(ref _pos) == false)
{
return(false);
}
_state.CurrentTokenType = JsonParserToken.False;
_state.Continuation = JsonParserTokenContinuation.None;
return(true);
}
case JsonParserTokenContinuation.PartialTrue:
{
if (EnsureRestOfToken(ref _pos) == false)
{
return(false);
}
_state.CurrentTokenType = JsonParserToken.True;
_state.Continuation = JsonParserTokenContinuation.None;
return(true);
}
case JsonParserTokenContinuation.PartialNull:
{
if (EnsureRestOfToken(ref _pos) == false)
{
return(false);
}
_state.CurrentTokenType = JsonParserToken.Null;
_state.Continuation = JsonParserTokenContinuation.None;
return(true);
}
default:
ThrowException("Somehow got continuation for single byte token " + _state.Continuation);
return(false); // never hit
}
}
