public static string ReadHexProgressive(string s, ref double d, out int digits)
{
digits = 0;
for (int i = 0; i < s.Length; i++)
{
char c = s[i];
if (LexerUtils.CharIsHexDigit(c))
{
int v = LexerUtils.HexDigit2Value(c);
d *= 16.0;
d += v;
++digits;
}
else
{
return(s.Substring(i));
}
}
return(string.Empty);
}
private Token ReadNumberToken(int fromLine, int fromCol, bool leadingDot)
{
StringBuilder text = new StringBuilder(32);
//INT : Digit+
//HEX : '0' [xX] HexDigit+
//BIN : '0' [bB] BinDigit+
//FLOAT : Digit+ '.' Digit* ExponentPart?
// | '.' Digit+ ExponentPart?
// | Digit+ ExponentPart
//HEX_FLOAT : '0' [xX] HexDigit+ '.' HexDigit* HexExponentPart?
// | '0' [xX] '.' HexDigit+ HexExponentPart?
// | '0' [xX] HexDigit+ HexExponentPart
//
// ExponentPart : [eE] [+-]? Digit+
// HexExponentPart : [pP] [+-]? Digit+
bool isHex = false;
bool isBin = false;
bool dotAdded = false;
bool exponentPart = false;
bool exponentSignAllowed = false;
if (leadingDot)
{
text.Append("0.");
}
else if (CursorChar() == '0')
{
text.Append(CursorChar());
char secondChar = CursorCharNext();
if (secondChar == 'x' || secondChar == 'X')
{
isHex = true;
text.Append(CursorChar());
CursorCharNext();
}
else if (secondChar == 'b' || secondChar == 'B')
{
isBin = true;
text.Append(CursorChar());
CursorCharNext();
}
}
for (char c = CursorChar(); CursorNotEof(); c = CursorCharNext())
{
if (exponentSignAllowed && (c == '+' || c == '-'))
{
exponentSignAllowed = false;
text.Append(c);
}
else if (LexerUtils.CharIsDigit(c))
{
text.Append(c);
}
else if (c == '.' && !dotAdded)
{
dotAdded = true;
text.Append(c);
}
else if (LexerUtils.CharIsHexDigit(c) && isHex && !exponentPart)
{
text.Append(c);
}
else if (LexerUtils.CharIsBinDigit(c) && isBin && !exponentPart)
{
text.Append(c);
}
else if (c == 'e' || c == 'E' || (isHex && (c == 'p' || c == 'P')))
{
text.Append(c);
exponentPart = true;
exponentSignAllowed = true;
dotAdded = true;
}
else
{
break;
}
}
TokenType numberType = TokenType.Number;
if (isHex && (dotAdded || exponentPart))
{
numberType = TokenType.Number_HexFloat;
}
else if (isHex)
{
numberType = TokenType.Number_Hex;
}
else if (isBin && (dotAdded || exponentPart))
{
numberType = TokenType.Number_BinFloat;
}
else if (isBin)
{
numberType = TokenType.Number_Bin;
}
string tokenStr = text.ToString();
return(CreateToken(numberType, fromLine, fromCol, tokenStr));
}