public Expression typeof_expression()
{
Expression expression = null;
try
{
bool flag = false;
if ((this.LA(1) == 0x2c) && tokenSet_16_.member(this.LA(2)))
{
int num = this.mark();
flag = true;
base.inputState.guessing++;
try
{
this.match(0x2c);
this.match(0x3f);
this.expression();
this.match(0x40);
}
catch (RecognitionException)
{
flag = false;
}
this.rewind(num);
base.inputState.guessing--;
}
if (flag)
{
return this.typeof_with_expression();
}
if ((this.LA(1) != 0x2c) || !tokenSet_16_.member(this.LA(2)))
{
throw new NoViableAltException(this.LT(1), this.getFilename());
}
return this.typeof_expression_alt();
}
catch (RecognitionException exception2)
{
if (base.inputState.guessing != 0)
{
throw;
}
this.reportError(exception2);
this.recover(exception2, tokenSet_20_);
return expression;
}
return expression;
}