private void Combinator(char combinator)
{
tq.ConsumeWhitespace();
string subQuery = ConsumeSubQuery(); // support multi > childs
Evaluator rootEval; // the new topmost evaluator
Evaluator currentEval; // the evaluator the new eval will be combined to. could be root, or rightmost or.
Evaluator newEval = Parse(subQuery); // the evaluator to add into target evaluator
bool replaceRightMost = false;
if (evals.Count == 1)
{
rootEval = currentEval = evals[0];
// make sure OR (,) has precedence:
if (rootEval is CombiningEvaluator.Or && combinator != ',')
{
currentEval = ((CombiningEvaluator.Or)currentEval).RightMostEvaluator();
replaceRightMost = true;
}
}
else
{
rootEval = currentEval = new CombiningEvaluator.And(evals);
}
evals.Clear();
// for most combinators: change the current eval into an AND of the current eval and the new eval
if (combinator == '>')
{
currentEval = new CombiningEvaluator.And(newEval, new StructuralEvaluator.ImmediateParent(currentEval));
}
else if (combinator == ' ')
{
currentEval = new CombiningEvaluator.And(newEval, new StructuralEvaluator.Parent(currentEval));
}
else if (combinator == '+')
{
currentEval = new CombiningEvaluator.And(newEval, new StructuralEvaluator.ImmediatePreviousSibling(currentEval));
}
else if (combinator == '~')
{
currentEval = new CombiningEvaluator.And(newEval, new StructuralEvaluator.PreviousSibling(currentEval));
}
else if (combinator == ',')
{
// group or.
CombiningEvaluator.Or or;
if (currentEval is CombiningEvaluator.Or)
{
or = (CombiningEvaluator.Or)currentEval;
or.Add(newEval);
}
else
{
or = new CombiningEvaluator.Or();
or.Add(currentEval);
or.Add(newEval);
}
currentEval = or;
}
else
{
throw new Selector.SelectorParseException("Unknown combinator: " + combinator);
}
if (replaceRightMost)
{
((CombiningEvaluator.Or)rootEval).ReplaceRightMostEvaluator(currentEval);
}
else
{
rootEval = currentEval;
}
evals.Add(rootEval);
}
private void Combinator(char combinator)
{
tq.ConsumeWhitespace();
string subQuery = ConsumeSubQuery(); // support multi > childs
Evaluator rootEval; // the new topmost evaluator
Evaluator currentEval; // the evaluator the new eval will be combined to. could be root, or rightmost or.
Evaluator newEval = Parse(subQuery); // the evaluator to add into target evaluator
bool replaceRightMost = false;
if (evals.Count == 1)
{
rootEval = currentEval = evals[0];
// make sure OR (,) has precedence:
if (rootEval is CombiningEvaluator.Or && combinator != ',')
{
currentEval = ((CombiningEvaluator.Or)currentEval).RightMostEvaluator();
replaceRightMost = true;
}
}
else
{
rootEval = currentEval = new CombiningEvaluator.And(evals);
}
evals.Clear();
// for most combinators: change the current eval into an AND of the current eval and the new eval
if (combinator == '>')
{
currentEval = new CombiningEvaluator.And(newEval, new StructuralEvaluator.ImmediateParent(currentEval));
}
else if (combinator == ' ')
{
currentEval = new CombiningEvaluator.And(newEval, new StructuralEvaluator.Parent(currentEval));
}
else if (combinator == '+')
{
currentEval = new CombiningEvaluator.And(newEval, new StructuralEvaluator.ImmediatePreviousSibling(currentEval));
}
else if (combinator == '~')
{
currentEval = new CombiningEvaluator.And(newEval, new StructuralEvaluator.PreviousSibling(currentEval));
}
else if (combinator == ',')
{
// group or.
CombiningEvaluator.Or or;
if (currentEval is CombiningEvaluator.Or)
{
or = (CombiningEvaluator.Or)currentEval;
or.Add(newEval);
}
else
{
or = new CombiningEvaluator.Or();
or.Add(currentEval);
or.Add(newEval);
}
currentEval = or;
}
else
{
throw new Selector.SelectorParseException("Unknown combinator: " + combinator);
}
if (replaceRightMost)
{
((CombiningEvaluator.Or)rootEval).ReplaceRightMostEvaluator(currentEval);
}
else
{
rootEval = currentEval;
}
evals.Add(rootEval);
}