private TokenType ReadNumber()
{
// TODO returning bool instead of token type
bool hasDigitsBeforePoint = false;
// bool hasDecimalPoint = false;
bool hasDigitsAfterPoint = false;
// bool hasExponentialNotation = false;
hasDigitsBeforePoint = ReadDigits();
if (CharPredicates.IsDecimalPoint(_scanner.Peek()))
{
// hasDecimalPoint = true;
next.Value += _scanner.Advance();
hasDigitsAfterPoint = ReadDigits();
}
if (!hasDigitsBeforePoint && !hasDigitsAfterPoint)
{
return(TokenType.ILLEGAL);
}
if (CharPredicates.IsExponentialNotation(_scanner.Peek()))
{
// hasExponentialNotation = true;
next.Value += _scanner.Advance();
if (CharPredicates.IsSignOperator(_scanner.Peek()))
{
next.Value += _scanner.Advance();
}
if (!CharPredicates.IsDigit(_scanner.Peek()))
{
return(TokenType.ILLEGAL);
}
ReadDigits();
}
return(TokenType.NUMBER);
}
