internal static bool IsPseudoMatch(this HtmlAgilityPack.HtmlNode node, SimpleSelector selector, Stack<SimpleSelector> remainingStack)
{
//by default we fail out any rule using a pseudo selector
return false;
}
private void Add(SimpleSelector addSel)
{
if (addSel.Child != null)
Add(addSel.Child);
if (!string.IsNullOrEmpty(addSel.Class))
Class++;
if (addSel.Attribute != null)
Attribute++;
if (addSel.Pseudo != null)
Attribute++;
if (!string.IsNullOrEmpty(addSel.ElementName))
Element++;
if (!string.IsNullOrEmpty(addSel.ID))
Id++;
}
internal static bool IsMatch(this HtmlAgilityPack.HtmlNode node, SimpleSelector selector, Stack<SimpleSelector> remainingStack)
{
if (!string.IsNullOrEmpty(selector.ElementName) && node.Name != selector.ElementName)
return false;
if (!string.IsNullOrEmpty(selector.ID) && node.Id != selector.ID)
return false;
if (!string.IsNullOrEmpty(selector.Class))
{
var classString = node.Attributes.Contains("class") ? node.Attributes["class"].Value : "";
if (!classString.Split(' ').Contains(selector.Class))
return false;
}
if (!string.IsNullOrEmpty(selector.Pseudo)) {
if (!node.IsPseudoMatch(selector, remainingStack))
return false;
}
if (selector.Combinator != null && remainingStack.Any())
{
var nextSel = remainingStack.Pop();
switch (selector.Combinator.Value)
{
case Combinator.ChildOf:
if (node.ParentNode == null)//has to be a child of something
return false;
if(!node.ParentNode.IsMatch(nextSel, remainingStack))
return false;
break;
case Combinator.Namespace:
//we are not going to support this until I see a valid use case
return false;
case Combinator.PrecededBy:
if(!node.PreviousSiblingsNotText().Any(x=>x.IsMatch(nextSel, remainingStack)))
return false;
break;
case Combinator.PrecededImmediatelyBy:
var sib = node.PreviousSiblingNotText();
if (sib == null)//has to be a child of something
return false;
if (!sib.IsMatch(nextSel, remainingStack))
return false;
break;
default:
break;
}
}
if (selector.Attribute != null)
{
if (!node.IsMatch(selector.Attribute))
return false;
}
if (selector.Child != null)
{
return node.IsMatch(selector.Child, remainingStack);
}
return true;
}