/// <summary>
/// Lex an optional integer suffix (U and/or L).
/// </summary>
private IntLitKind LexIntSuffix()
{
IntLitKind ilk = IntLitKind.None;
for (; ;)
{
if (ChCur == 'U' || ChCur == 'u')
{
if ((ilk & IntLitKind.Uns) != 0)
{
break;
}
ilk |= IntLitKind.Uns;
}
else if (ChCur == 'L' || ChCur == 'l')
{
if ((ilk & IntLitKind.Lng) != 0)
{
break;
}
ilk |= IntLitKind.Lng;
}
else
{
break;
}
ChNext();
}
return(ilk);
}
/// <summary>
/// Lex a decimal integer literal. The digits must be in _sb.
/// </summary>
private Token LexDecInt(IntLitKind ilk)
{
// Digits are in _sb.
Contracts.Assert(_sb.Length > 0);
ulong u = 0;
try
{
for (int ich = 0; ich < _sb.Length; ich++)
{
u = checked (u * 10 + (ulong)LexCharUtils.GetDecVal(_sb[ich]));
}
}
catch (System.OverflowException)
{
ReportError(ErrId.IntOverflow);
u = ulong.MaxValue;
}
return(new IntLitToken(GetSpan(), u, ilk));
}
public readonly IntLitKind IntKind; // The kind specified by suffixes.
public IntLitToken(TextSpan span, ulong val, IntLitKind ilk)
: base(span, TokKind.IntLit)
{
Value = val;
IntKind = ilk;
}