public RptUnit Parser(bool needParens)
{
int token;
RptUnit rpnUnit = null, cur;
bool meedParens = false;
while ((token = _lexer.GetToken()) != Token.EOF)
{
cur = null;
if (token == Token.INTEGER)
{
int number = (int)_lexer.CurrentValue;
if (_checkIdentifier != null && !_checkIdentifier(number))
{
throw new APRptConditionParseException(APResource.GetString(APResource.APRptFilter_LogicIdentifierInvalidate, number));
}
cur = new OperandRpnUnit(number.ToString());
}
else if (token == Token.IDENTIFIER)
{
string identifier = (string)_lexer.CurrentValue;
if (_checkIdentifier != null && !_checkIdentifier(identifier))
{
throw new APRptConditionParseException(APResource.GetString(APResource.APRptFilter_LogicIdentifierInvalidate, identifier));
}
cur = new OperandRpnUnit(identifier);
}
else if (token == Token.BITWISE_AND || token == Token.BITWISE_OR)
{
if (rpnUnit == null || IsUncompletedRpnUnit(rpnUnit))
{
throw new APRptConditionParseException(APResource.APRptFilter_LogicExpressionInvalidate);
}
cur = new BinaryRpnUnit(rpnUnit, token == Token.BITWISE_AND ? RpnOperator.AND : RpnOperator.OR);
rpnUnit = null;
}
else if (token == Token.LOGIC_NOT)
{
if (rpnUnit != null && !IsUncompletedRpnUnit(rpnUnit))
{
throw new APRptConditionParseException(APResource.APRptFilter_LogicExpressionInvalidate);
}
cur = new UnaryNotRpnUnit();
}
else if (token == Token.OPEN_PARENS)
{
cur = Parser(true);
}
else if (token == Token.CLOSE_PARENS)
{
meedParens = true;
if (!needParens)
{
throw new APRptConditionParseException(APResource.APRptFilter_LogicExpressionInvalidate);
}
break;
}
else
{
throw new APRptConditionParseException(APResource.APRptFilter_LogicExpressionInvalidate);
}
if (cur == null)
{
throw new APRptConditionParseException(APResource.APRptFilter_LogicExpressionInvalidate);
}
if (rpnUnit == null)
{
rpnUnit = cur;
}
else if (IsUncompletedRpnUnit(rpnUnit))
{
(rpnUnit as IRightRpnUnit).SetRight(cur);
}
else
{
throw new APRptConditionParseException(APResource.APRptFilter_LogicExpressionInvalidate);
}
}
if (needParens && !meedParens)
{
throw new APRptConditionParseException(APResource.APRptFilter_LogicExpressionInvalidate);
}
if (IsUncompletedRpnUnit(rpnUnit))
{
throw new APRptConditionParseException(APResource.APRptFilter_LogicExpressionInvalidate);
}
return(rpnUnit);
}
private bool IsUncompletedRpnUnit(RptUnit rpnUnit)
{
return(rpnUnit is IRightRpnUnit && !(rpnUnit as IRightRpnUnit).IsCompleted);
}