private double _ReadNumber()
{
var expo = new char[] { 'E', 'e' };
Utl.Assert(_CurrentIsDigit());
var first = Current;
_SaveAndNext();
if (first == '0' && (Current == 'X' || Current == 'x'))
{
expo = new char[] { 'P', 'p' };
_SaveAndNext();
}
for (; ;)
{
if (Current == expo[0] || Current == expo[1])
{
_SaveAndNext();
if (Current == '+' || Current == '-')
{
_SaveAndNext();
}
}
if (_CurrentIsXDigit() || Current == '.')
{
_SaveAndNext();
}
else
{
break;
}
}
double ret;
var str = _GetSavedString();
if (O_Str2Decimal(str, out ret))
{
return(ret);
}
else
{
_Error("malformed number: " + str);
return(0.0);
}
}
public Token GetLookAhead()
{
Utl.Assert(LookAhead == null);
LookAhead = _Lex();
return(LookAhead);
}