// Does not include sign, Infinity, NaN, which are concepted in parser
// 1E1000 => -Infinity (netcore vs net framework)
// TODO parse 1_000
// TODO parse 0xffff
private Token NumberToken()
{
Next();
while (Chars.IsDigit(c))
{
Next();
}
if (c == '.')
{
var c1 = Peek(1);
if (Chars.IsDigit(c1))
{
Next(2);
while (Chars.IsDigit(c))
{
Next();
}
}
}
if (c == 'e' || c == 'E')
{
var n = 1;
var cn = Peek(n);
if (cn == '+' || cn == '-')
{
n++;
}
cn = Peek(n);
if (Chars.IsDigit(cn))
{
n++;
}
Next(n);
while (Chars.IsDigit(c))
{
Next();
}
}
var value = SigoConverter.ToDouble(src.Substring(start, end - start));
return(CreateToken(Kind.Number, value));
}
private void ScanStringEscape()
{
Next();
switch (c)
{
case Eof:
throw new Exception("UnterminatedStringLiteral");
case '\r':
Next();
if (c == '\n')
{
Next();
}
break;
case '\n':
Next();
break;
case '\\':
case '"':
case '\'':
sb.Append(c);
Next();
break;
case 'b':
sb.Append('\b');
Next();
break;
case 'f':
sb.Append('\f');
Next();
break;
case 'r':
sb.Append('\r');
Next();
break;
case 'n':
sb.Append('\n');
Next();
break;
case 't':
sb.Append('\t');
Next();
break;
case 'u':
Next();
var u = 0;
var i = 0;
for (; i < 4; i++)
{
var h = SigoConverter.TryConvertHexChar2Int(c);
if (h >= 0)
{
Next();
u = u * 16 + h;
}
else
{
break;
}
}
if (i == 4)
{
sb.Append((char)u);
}
else
{
throw new Exception("HexadecimalDigitExpected");
}
break;
default: // /c
sb.Append(c); // warning unknown escape
Next();
break;
} // switch (the letter after \)
}