public NumberLiteral ReadNumberLiteral()
{
var location0 = Tokenizer.GetCurrentLocation();
if (CurToken.Type != TokenType.Number)
{
ThrowExpect("number", CurToken);
}
if (CurToken.Value.StartsWith("0x", StringComparison.InvariantCulture))
{
var literal = new NumberLiteral(location0)
{
HexFormat = true
};
if (CurToken.Value.Contains(".") ||
CurToken.Value.Contains("p") ||
CurToken.Value.Contains("P")
)
{
literal.Value = LexerUtils.ParseHexFloat(CurToken);
}
else
{
literal.Value = LexerUtils.ParseHexInteger(CurToken);
}
//if (!int.TryParse(CurToken.Value.Substring(2),
// System.Globalization.NumberStyles.AllowHexSpecifier,
// null,
// out int hexvalue))
//{
//}
Move();
return(literal);
}
if (!double.TryParse(CurToken.Value, out double value))
{
ThrowExpect("number", CurToken);
}
Move();
return(new NumberLiteral(location0)
{
Value = value
});
}
public static double ParseHexFloat(string s)
{
try
{
if ((s.Length < 2) || (s[0] != '0' && (char.ToUpper(s[1]) != 'X')))
{
throw new InternalErrorException("hex float must start with '0x' near '{0}'", s);
}
s = s.Substring(2);
double value = 0.0;
int dummy, exp = 0;
s = LexerUtils.ReadHexProgressive(s, ref value, out dummy);
if (s.Length > 0 && s[0] == '.')
{
s = s.Substring(1);
s = LexerUtils.ReadHexProgressive(s, ref value, out exp);
}
exp *= -4;
if (s.Length > 0 && char.ToUpper(s[0]) == 'P')
{
if (s.Length == 1)
{
throw new InternalErrorException("invalid hex float format near '{0}'", s);
}
s = s.Substring(s[1] == '+' ? 2 : 1);
int exp1 = int.Parse(s, CultureInfo.InvariantCulture);
exp += exp1;
}
double result = value * Math.Pow(2, exp);
return(result);
}
catch (FormatException)
{
throw new InternalErrorException("malformed number near '{0}'", s);
}
}
