public void Visit(NthChildSelector selector)
{
this.Specificity += (1 << 8);
}
private bool CountMatches(NthChildSelector selector, int count)
{
var withOffset = count - selector.Offset;
return (selector.Step == 0 ? withOffset == 0 : withOffset % selector.Step == 0);
}
public void Visit(NthChildSelector selector)
{
this.Visit((PseudoSelector)selector);
_writer.Write('(');
if (selector.Step == 2 && selector.Offset == 1)
{
_writer.Write(PseudoSelectorPrefix.NthChildOdd);
}
else if (selector.Step == 2 && selector.Offset == 0)
{
_writer.Write(PseudoSelectorPrefix.NthChildEven);
}
else
{
_writer.Write(selector.Step);
_writer.Write('n');
if (selector.Offset >= 0) _writer.Write('+');
_writer.Write(selector.Offset);
}
_writer.Write(')');
}
public void Visit(NthChildSelector selector)
{
switch (selector.Type)
{
case PseudoTypes.FunctionNthchild:
_matches = _matches.Where(n => _engine.Parents(n).Any()
&& CountMatches(selector, _engine.PrecedingSiblings(n).Count() + 1));
break;
case PseudoTypes.FunctionNthlastchild:
_matches = _matches.Where(n => _engine.Parents(n).Any()
&& CountMatches(selector, _engine.FollowingSiblings(n).Count() + 1));
break;
case PseudoTypes.FunctionNthLastOfType:
_matches = _matches.Where(n => _engine.Parents(n).Any()
&& CountMatches(selector, _engine.FollowingSiblings(n).Count(m => IsMatch(n.Name, m.Name)) + 1));
break;
case PseudoTypes.FunctionNthOfType:
_matches = _matches.Where(n => _engine.Parents(n).Any()
&& CountMatches(selector, _engine.PrecedingSiblings(n).Count(m => IsMatch(n.Name, m.Name)) + 1));
break;
default:
NotSupported();
break;
}
}
private NthChildSelector GetChildSelector(PseudoTypes type)
{
var selector = new NthChildSelector(type);
if (_attributeValue.Equals(PseudoSelectorPrefix.NthChildOdd, StringComparison.OrdinalIgnoreCase))
{
selector.Step = 2;
selector.Offset = 1;
}
else if (_attributeValue.Equals(PseudoSelectorPrefix.NthChildEven, StringComparison.OrdinalIgnoreCase))
{
selector.Step = 2;
selector.Offset = 0;
}
else if (!int.TryParse(_attributeValue, out selector.Offset))
{
var index = _attributeValue.IndexOf(PseudoSelectorPrefix.NthChildN, StringComparison.OrdinalIgnoreCase);
if (_attributeValue.Length <= 0 || index == -1)
{
return selector;
}
var first = _attributeValue.Substring(0, index).Replace(" ", "");
var second = "";
if (_attributeValue.Length > index + 1)
{
second = _attributeValue.Substring(index + 1).Replace(" ", "");
}
if (first == string.Empty || (first.Length == 1 && first[0] == Specification.PlusSign))
{
selector.Step = 1;
}
else if (first.Length == 1 && first[0] == Specification.MinusSign)
{
selector.Step = -1;
}
else
{
int step;
if (int.TryParse(first, out step))
{
selector.Step = step;
}
}
if (second == string.Empty)
{
selector.Offset = 0;
}
else
{
int offset;
if (int.TryParse(second, out offset))
{
selector.Offset = offset;
}
}
}
return selector;
}
