public void Add(HtmlObject content)
{
Requires.NotNull(content, nameof(content));
if (ReferenceEquals(this, content.Parent))
{
throw new InvalidOperationException("Cannot have a duplicate element or attribute");
}
if (content is HtmlNode)
{
if (ReferenceEquals(this, content))
{
throw new InvalidOperationException("Cannot add an object as a child to itself.");
}
ThrowIfVoid();
AddNodeAfter(this, _nodes._last, (HtmlNode)content);
}
else if (content is HtmlAttribute)
{
HtmlAttribute attribute = (HtmlAttribute)content;
if (HasAttribute(attribute.Name))
{
throw new InvalidOperationException("Cannot have a duplicate element or attribute.");
}
AddAttribute(attribute);
}
else
{
throw new ArgumentException("The object to add was not a node or attribute", nameof(content));
}
}
public IEnumerable <HtmlNode> NextNodes()
{
HtmlObject nextNode = _next;
while (nextNode != null)
{
yield return((HtmlNode)nextNode);
nextNode = nextNode._next;
}
}
public IEnumerable <HtmlNode> PreviousNodes()
{
HtmlObject previousNode = _previous;
while (previousNode != null)
{
yield return((HtmlNode)previousNode);
previousNode = previousNode._previous;
}
}
public IEnumerable <HtmlNode> Nodes()
{
HtmlObject node = _nodes._first;
while (node != null)
{
yield return((HtmlNode)node);
node = node._next;
}
}
public IEnumerable <HtmlElement> PreviousElements(string tag)
{
bool isDefaultTag = string.IsNullOrEmpty(tag);
HtmlObject previousNode = _previous;
while (previousNode != null)
{
HtmlElement previousElement = previousNode as HtmlElement;
if (previousElement != null && (isDefaultTag || StringExtensions.EqualsAsciiOrdinalIgnoreCase(previousElement.Tag, tag)))
{
yield return(previousElement);
}
previousNode = previousNode._previous;
}
}
public IEnumerable <HtmlElement> NextElements(string tag)
{
bool isDefaultTag = string.IsNullOrEmpty(tag);
HtmlObject nextNode = _next;
while (nextNode != null)
{
HtmlElement nextElement = nextNode as HtmlElement;
if (nextElement != null && (isDefaultTag || StringExtensions.EqualsAsciiOrdinalIgnoreCase(nextElement.Tag, tag)))
{
yield return(nextElement);
}
nextNode = nextNode._next;
}
}
public IEnumerable <HtmlElement> Descendants(string tag)
{
bool isDefaultTag = string.IsNullOrEmpty(tag);
HtmlObject node = _nodes._first;
while (node != null)
{
HtmlElement element = node as HtmlElement;
if (element != null)
{
if (isDefaultTag || StringExtensions.EqualsAsciiOrdinalIgnoreCase(element.Tag, tag))
{
yield return(element);
}
foreach (HtmlElement child in element.Descendants(tag))
{
yield return(child);
}
}
node = node._next;
}
}
public static T WithChild <T>(this T self, HtmlObject element) where T : HtmlElement
{
self.Add(element);
return(self);
}
