bool ICssPseudoClassSelector.IsEligible(IHtmlElement element)
{
if (element == null)
{
throw new ArgumentNullException("element");
}
List <IHtmlElement> siblings;
if (ofType)
{
siblings = element.Siblings(element.Name).ToList();
}
else
{
siblings = element.Siblings().ToList();
}
if (last)
{
siblings.Reverse();
}
return(Check(siblings.IndexOf(element)));
}
private static string CreateIdentity(IHtmlElement element, bool ancestorsCreate)
{
string parentId;
var parentElement = element.Parent();
if (parentElement != null)
{
parentId = Identity(parentElement);
if (parentId == null)
{
if (ancestorsCreate)
{
parentId = Identity(parentElement, true, true);
}
else
{
parentId = CreateIdentity(parentElement, false);
}
}
}
else
{
if (element.Container is IHtmlDocument)
{
parentId = null;
}
else
{
throw new InvalidOperationException();
}
}
var name = GetElementName(element);
var builder = new StringBuilder();
if (!string.IsNullOrEmpty(parentId))
{
builder.AppendFormat("{0}_", parentId);
}
builder.Append(name);
if (element.Siblings().Where(e => GetElementName(e).EqualsIgnoreCase(GetElementName(element))).IsSingle())
{
return(builder.ToString());
}
var index = element.SiblingsBeforeSelf().Count(e => GetElementName(e).EqualsIgnoreCase(GetElementName(element)));
builder.Append(index + 1);
var identity = builder.ToString();
return(EnsureUniqueness(identity, element.Document));
}
bool ICssPseudoClassSelector.IsEligible(IHtmlElement element)
{
if (element == null)
{
throw new ArgumentNullException("element");
}
switch (_name)
{
case "only-child":
return(element.Siblings().Count() == 1);
case "only-of-type":
return(element.Siblings(element.Name).Count() == 1);
case "empty":
return(element.Elements().Count() == 0);
default:
throw new InvalidOperationException();
}
}
bool ICssPseudoClassSelector.IsEligible(IHtmlElement element)
{
if (element == null)
{
throw new ArgumentNullException("element");
}
switch (_name)
{
case "only-child":
return(element.Siblings().Count() == 1);
case "only-of-type":
return(element.Siblings(element.Name).Count() == 1);
case "empty":
return(element.Nodes().Count(n => n is IHtmlElement || n is IHtmlTextNode) == 0);//只有元素和文本节点视为有内容 http://www.w3.org/TR/2011/REC-css3-selectors-20110929/#empty-pseudo
default:
throw new InvalidOperationException();
}
}
/// <summary>
/// 获取在兄弟元素中，自己的顺序位置
/// </summary>
/// <param name="element">要获取序号的元素</param>
/// <returns>顺序位置</returns>
public static int ElementsIndexOfSelf(this IHtmlElement element)
{
var siblings = element.Siblings();
return(siblings.ToList().IndexOf(element));
}
private static string CreateIdentity( IHtmlElement element, bool ancestorsCreate )
{
string parentId;
var parentElement = element.Parent();
if ( parentElement != null )
{
parentId = Identity( parentElement );
if ( parentId == null )
{
if ( ancestorsCreate )
parentId = Identity( parentElement, true, true );
else
parentId = CreateIdentity( parentElement, false );
}
}
else
{
if ( element.Container is IHtmlDocument )
parentId = null;
else
throw new InvalidOperationException();
}
var name = GetElementName( element );
var builder = new StringBuilder();
if ( !string.IsNullOrEmpty( parentId ) )
builder.AppendFormat( "{0}_", parentId );
builder.Append( name );
string identity;
if ( element.Siblings().Where( e => GetElementName( e ).EqualsIgnoreCase( GetElementName( element ) ) ).IsSingle() )
identity = builder.ToString();
var index = element.SiblingsBeforeSelf().Count( e => GetElementName( e ).EqualsIgnoreCase( GetElementName( element ) ) );
builder.Append( index + 1 );
identity = builder.ToString();
return EnsureUniqueness( identity, element.Document );
}
bool ICssPseudoClassSelector.IsEligible( IHtmlElement element )
{
if ( element == null )
throw new ArgumentNullException( "element" );
switch ( _name )
{
case "only-child":
return element.Siblings().Count() == 1;
case "only-of-type":
return element.Siblings( element.Name ).Count() == 1;
case "empty":
return element.Nodes().Count( n => n is IHtmlElement || n is IHtmlTextNode ) == 0;//只有元素和文本节点视为有内容 http://www.w3.org/TR/2011/REC-css3-selectors-20110929/#empty-pseudo
default:
throw new InvalidOperationException();
}
}
bool ICssPseudoClassSelector.IsEligible( IHtmlElement element )
{
if ( element == null )
throw new ArgumentNullException( "element" );
List<IHtmlElement> siblings;
if ( ofType )
siblings = element.Siblings( element.Name ).ToList();
else
siblings = element.Siblings().ToList();
if ( last )
siblings.Reverse();
return Check( siblings.IndexOf( element ) );
}
