/// <summary>
/// Skip over an error character. Always returns null.
/// REVIEW: Should we skip over multiple?
/// </summary>
private Token LexError()
{
_sb.Length = 0;
do
{
_sb.AppendFormat("{0}({1})", ChCur, LexCharUtils.GetUniEscape(ChCur));
} while (LexCharUtils.StartKind(ChNext()) == LexStartKind.None && !Eof);
return(new ErrorToken(GetSpan(), ErrId.BadChar, _sb.ToString()));
}
private NormStr LexIdentCore(ref bool fVerbatim)
{
Contracts.Assert(LexCharUtils.IsIdentStart(ChCur));
_sb.Length = 0;
for (; ;)
{
char ch;
if (ChCur == '\\')
{
uint u;
int ichErr = _cursor.IchCur;
if (!FLexEscChar(true, out u))
{
break;
}
if (u > 0xFFFF || !LexCharUtils.IsIdent(ch = (char)u))
{
ReportError(ichErr, _cursor.IchCur, ErrId.BadChar, LexCharUtils.GetUniEscape(u));
break;
}
fVerbatim = true;
}
else
{
if (!LexCharUtils.IsIdent(ChCur))
{
break;
}
ch = ChCur;
ChNext();
}
Contracts.Assert(LexCharUtils.IsIdent(ch));
if (!LexCharUtils.IsFormat(ch))
{
_sb.Append(ch);
}
}
if (_sb.Length == 0)
{
return(null);
}
return(_lex._pool.Add(_sb));
}