private NPathExpression ParseOperator(IValue leftOperand)
{
NPathExpression current = null;
if (tokenizer.GetCurrentToken().IsType("boolop"))
{
current = ParseBooleanOperator(leftOperand);
}
if (tokenizer.GetCurrentToken().IsType("compare"))
{
current = ParseCompareOperator(leftOperand);
}
if (tokenizer.GetCurrentToken().IsType("math"))
{
current = ParseMathOperator(leftOperand);
}
current = SwapNodes(current);
return(current);
}
private NPathExpression SwapNodes(NPathExpression current)
{
if (current.RightOperand is NPathExpression)
{
NPathExpression next = current.RightOperand as NPathExpression;
int prio1 = current.GetOperatorPriority();
int prio2 = next.GetOperatorPriority();
if (prio2 < prio1)
{
NPathExpression tmp = current;
current = next;
next = tmp;
IValue nextLeft = next.LeftOperand;
IValue currentLeft = next.LeftOperand;
IValue nextRight = next.RightOperand;
IValue currentRight = next.RightOperand;
// (c = (b and (d = (f and (4 div (5 add (2 = (7 or (
//"c = " "b and" "d =" // do not localize
//"c = b" " and " "d =" // do not localize
next.RightOperand = current.LeftOperand;
next = SwapNodes(next);
current.LeftOperand = next;
}
}
return(current);
}
protected virtual void EmitSelect(NPathSelectQuery query)
{
NPathSelectClause select = query.Select;
Write("select "); // do not localize
if (query.Select.HasTop)
{
Write("top {0}", query.Select.Top); // do not localize
if (query.Select.Percent)
{
Write("% ");
}
}
int i = 0;
foreach (NPathSelectField field in select.SelectFields)
{
if (field.Expression is NPathIdentifier)
{
NPathIdentifier path = field.Expression as NPathIdentifier;
Write(path.Path);
}
if (field.Expression is NPathFunction)
{
NPathFunction function = field.Expression as NPathFunction;
EmitFunction(function);
}
if (field.Expression is NPathExpression)
{
NPathExpression expression = field.Expression as NPathExpression;
EmitExpression(expression);
}
if (field.Alias != null && field.Alias != "")
{
WriteLine(" as [{0}]", field.Alias); // do not localize
}
if (i < select.SelectFields.Count - 1)
{
Write(",");
}
i++;
}
WriteLine();
}
