protected override string BuildCondition(QConditionNode node)
{
string lvalue = BuildValue(node.LValue);
string rvalue = BuildValue(node.RValue);
Conditions condition = (node.Condition | Conditions.Not) ^ Conditions.Not;
string res = null;
for (int i = 0; i < enumConditions.Length; i++)
{
if (enumConditions[i] == condition)
{
res = stringConditions[i];
break; // first match
}
}
if (res == null)
{
throw new ArgumentException("Invalid conditions set", condition.ToString());
}
if ((node.Condition & Conditions.Not) == Conditions.Not)
{
res = "!" + res;
}
if ((node.Condition & Conditions.Null) == Conditions.Null)
{
rvalue = "null";
}
string result = String.Format("{0}{1}{2}", lvalue, res, rvalue);
if (!String.IsNullOrEmpty(node.Name))
{
result = String.Format("(<{0}> {1})", node.Name, result);
}
return(result);
}
protected QNode ParseCondition(string input, int startIdx, out int endIdx)
{
IQueryValue leftValue = ParseInternal(input, startIdx, out endIdx);
int nextEndIdx;
Conditions conditions = Conditions.Equal;
LexemType nextLexemType = GetLexemType(input, endIdx, out nextEndIdx);
if (!GetCondition(nextLexemType, input, endIdx, ref nextEndIdx, ref conditions))
{
throw new RelexParseException(
String.Format("Invalid syntax (position: {0}, expression: {1})", startIdx, input));
}
IQueryValue rightValue = ParseInternal(input, nextEndIdx, out endIdx);
QNode node;
if (IsNullValue(rightValue))
{
if ((conditions & Conditions.Equal) != 0)
{
node = new QConditionNode(leftValue, Conditions.Null | (conditions & ~Conditions.Equal), null);
}
else
{
throw new RelexParseException(
String.Format("Invalid syntax - such condition cannot be used with 'null' (position: {0}, expression: {1})", startIdx, input));
}
}
else
{
node = new QConditionNode(leftValue, conditions, rightValue);
}
return(node);
}