private void parsePseudoClass()
{
pseudoClassSelector pseudoClass = new pseudoClassSelector();
pseudoClass.wholeText = _selectorText;
if (_buffer.Length > 0)
{
pseudoClass.elementE = AppendCleanBuffer(_buffer);
}
char current = ReadNext();
bool InBracketState = false;
while (!stop)
{
if (InBracketState)
{
_buffer.Append(current);
if (current == ')')
{
InBracketState = false;
break;
}
}
else
{
if (current == ':')
{
if (_buffer.Length > 0)
{
pseudoClass.elementE += AppendCleanBuffer(_buffer);
}
}
else
{
if (current == '(')
{
InBracketState = true;
}
_buffer.Append(current);
}
}
current = ReadNext();
}
pseudoClass.matchText = AppendCleanBuffer(_buffer);
simple = pseudoClass;
}
private static int _getSilbingCount(Element element, pseudoClassSelector pseudoClass, bool last, bool sametype)
{
int counter = 0;
Node siblingNode;
if (last)
{
siblingNode = element.nextSibling();
}
else
{
siblingNode = element.previousSibling();
}
while (siblingNode != null)
{
if (siblingNode.nodeType == enumNodeType.ELEMENT)
{
if (sametype)
{
if (siblingNode.nodeName == pseudoClass.elementE)
{
counter += 1;
}
}
else
{
counter += 1;
}
}
if (last)
{
siblingNode = siblingNode.nextSibling();
}
else
{
siblingNode = siblingNode.previousSibling();
}
}
return(counter);
}
private static bool _pseudoClassNthMatch(Element element, pseudoClassSelector pseudoClass, bool last, bool sametype)
{
int firstindex = pseudoClass.matchText.IndexOf("(");
int lastindex = pseudoClass.matchText.IndexOf(")");
if (firstindex < 0 || lastindex < 0)
{
return(false);
}
string strnumber = pseudoClass.matchText.Substring(firstindex + 1, lastindex - firstindex - 1).Trim();
int counter = _getSilbingCount(element, pseudoClass, last, sametype);
if (CommonIdoms.isAsciiDigit(strnumber))
{
int nth = Convert.ToInt32(strnumber);
return(nth == (counter + 1));
}
else
{
if (strnumber.Contains("n"))
{
int beforen = 0;
int aftern = 0;
string strbefore = strnumber.Substring(0, strnumber.IndexOf("n")).Trim();
if (string.IsNullOrEmpty(strbefore))
{
return(false);
}
if (!int.TryParse(strbefore, out beforen))
{
return(false);
}
if (CommonIdoms.isAsciiDigit(strbefore))
{
beforen = Convert.ToInt32(strbefore);
}
if (strnumber.IndexOf("+") > 0)
{
string strafter = strnumber.Substring(strnumber.IndexOf("+") + 1).Trim();
if (!string.IsNullOrEmpty(strafter))
{
if (!int.TryParse(strafter, out aftern))
{
return(false);
}
}
}
if (beforen == 0)
{
return((counter + 1) == aftern);
}
else
{
return((counter + 1) % beforen == aftern);
}
}
else if (strnumber == "odd")
{
return((counter + 1) % 2 == 1);
}
else if (strnumber == "even")
{
return((counter + 1) % 2 == 0);
}
else
{
return(false);
}
}
}
private static bool matchPseudoClass(Element element, pseudoClassSelector pseudoClass)
{
if (!string.IsNullOrEmpty(pseudoClass.elementE))
{
if (!selectorMatch.Match(element, pseudoClass.ElementSelector))
{
return(false);
}
}
pseudoClass.matchText = pseudoClass.matchText.ToLower().Trim();
// E:root an E element, root of the document Structural pseudo-classes 3
if (pseudoClass.matchText == "root")
{
if (element.tagName == "html" && element.depth == 0)
{
return(true);
}
else
{
return(false);
}
}
//E:nth-child(n) an E element, the n-th child of its parent Structural pseudo-classes 3
else if (pseudoClass.matchText.Contains("nth-child"))
{
return(_pseudoClassNthMatch(element, pseudoClass, false, false));
}
else if (pseudoClass.matchText.Contains("not"))
{
if (pseudoClass.NotSelector == null)
{
return(false);
}
var innermatch = selectorMatch.Match(element, pseudoClass.NotSelector);
return(!innermatch);
}
//E:nth-last-child(n) an E element, the n-th child of its parent, counting from the last one Structural pseudo-classes 3
else if (pseudoClass.matchText.Contains("nth-last-child"))
{
return(_pseudoClassNthMatch(element, pseudoClass, true, false));
}
//E:nth-of-type(n) an E element, the n-th sibling of its type Structural pseudo-classes 3
else if (pseudoClass.matchText.Contains("nth-of-type"))
{
return(_pseudoClassNthMatch(element, pseudoClass, false, true));
}
//E:nth-last-of-type(n) an E element, the n-th sibling of its type, counting from the last one Structural pseudo-classes 3
else if (pseudoClass.matchText.Contains("nth-last-of-type"))
{
return(_pseudoClassNthMatch(element, pseudoClass, true, true));
}
//E:first-child an E element, first child of its parent Structural pseudo-classes 2
else if (pseudoClass.matchText == "first-child")
{
int counter = _getSilbingCount(element, pseudoClass, false, false);
return(counter == 0);
}
//E:last-child an E element, last child of its parent Structural pseudo-classes 3
else if (pseudoClass.matchText == "last-child")
{
int counter = _getSilbingCount(element, pseudoClass, true, false);
return(counter == 0);
}
//E:first-of-type an E element, first sibling of its type Structural pseudo-classes 3
else if (pseudoClass.matchText == "first-of-type")
{
int counter = _getSilbingCount(element, pseudoClass, false, true);
return(counter == 0);
}
//E:last-of-type an E element, last sibling of its type Structural pseudo-classes 3
else if (pseudoClass.matchText == "last-of-type")
{
int counter = _getSilbingCount(element, pseudoClass, true, true);
return(counter == 0);
}
//E:only-child an E element, only child of its parent Structural pseudo-classes 3
else if (pseudoClass.matchText == "only-child")
{
int counterbefore = _getSilbingCount(element, pseudoClass, false, false);
int counterafter = _getSilbingCount(element, pseudoClass, true, false);
return(counterafter == 0 && counterbefore == 0);
}
//E:only-of-type an E element, only sibling of its type Structural pseudo-classes 3
else if (pseudoClass.matchText == "only-of-type")
{
int counterbefore = _getSilbingCount(element, pseudoClass, false, true);
int counterafter = _getSilbingCount(element, pseudoClass, true, true);
return(counterafter == 0 && counterbefore == 0);
}
// E:empty an E element that has no children (including text nodes) Structural pseudo-classes 3
else if (pseudoClass.matchText == "empty")
{
return(element.childNodes.length == 0);
}
//E:link
//E:visited an E element being the source anchor of a hyperlink of which the target is not yet visited (:link) or already visited (:visited) The link pseudo-classes 1
//E:active
//E:hover
//E:focus an E element during certain user actions The user action pseudo-classes 1 and 2
//E:enabled
//E:disabled a user interface element E which is enabled or disabled The UI element states pseudo-classes 3
//E:checked a user interface element E which is checked (for instance a radio-button or checkbox) The UI element states pseudo-classes 3
else if (pseudoClass.matchText.isOneOf("active", "hover", "focus"))
{
return(true);
}
else if (pseudoClass.matchText.isOneOf("link", "visited"))
{
return(element.tagName == "a" || element.tagName == "area");
}
else if (pseudoClass.matchText.isOneOf("enabled", "disabled"))
{
return(true);
}
else if (pseudoClass.matchText == "checked")
{
return(element.tagName == "input");
}
//E:target an E element being the target of the referring URI The target pseudo-class 3
else if (pseudoClass.matchText == "target")
{
// Not supported.
return(true);
}
//E:lang(fr) an element of type E in language "fr" (the document language specifies how language is determined) The :lang() pseudo-class 2
else if (pseudoClass.matchText.StartsWith("lang"))
{
/// not supported, always return true because we do not know when the language will be switched. has to assume it will match.
return(true);
}
else
{
//Unrecognized syntax.
return(false);
}
}