/// <summary>
/// 替换指定节点
/// </summary>
/// <param name="oldNode">被替换的节点</param>
/// <param name="fragment">用于替换的碎片</param>
/// <exception cref="System.InvalidOperationException">被替换的节点与用于替换的节点不属于同一个文档</exception>
public static IEnumerable <IHtmlNode> Replace(this IHtmlNode oldNode, HtmlFragment fragment)
{
if (oldNode == null)
{
throw new ArgumentNullException("oldNode");
}
if (fragment == null)
{
throw new ArgumentNullException("fragment");
}
var container = oldNode.Container;
if (container == null)
{
throw new InvalidOperationException();
}
lock (container.SyncRoot)
{
var result = fragment.InsertTo(container, oldNode.NodesIndexOfSelf());
oldNode.Remove();
return(result);
}
}
/// <summary>
/// 将容器所有内容创建为文档碎片
/// </summary>
/// <param name="factory">用于创建节点的创造器</param>
/// <param name="container">包含内容的容器</param>
/// <returns>文档碎片</returns>
public static HtmlFragment MakeFragment(this IHtmlNodeFactory factory, IHtmlContainer container)
{
var fragment = new HtmlFragment(factory);
fragment.AddCopies(container.Nodes());
return(fragment);
}
/*
* /// <summary>
* /// 使用指定文本替换元素内容（警告，此方法会清除元素所有内容）
* /// </summary>
* /// <param name="element">要替换内容的元素</param>
* /// <param name="text">文本内容</param>
* public static void ReplaceChildsWithText( this IHtmlElement element, string text )
* {
* if ( element == null )
* throw new ArgumentNullException( "element" );
*
* var factory = element.Document.GetNodeFactory();
* if ( factory == null )
* throw new NotSupportedException();
*
* lock ( element.SyncRoot )
* {
* ClearNodes( element );
*
* if ( !HtmlSpecification.cdataTags.Contains( element.Name, StringComparer.OrdinalIgnoreCase ) )
* {
* var fragment = HtmlEncode( text, factory );
*
* fragment.InsertTo( element, 0 );
* }
* else
* {
* var textNode = factory.CreateTextNode( text );
* textNode.Into( element, 0 );
* }
* }
*
* }
*
* /// <summary>
* /// 使用指定的HTML文本替换元素内容（警告，此方法会清除元素所有内容）
* /// </summary>
* /// <param name="element">要替换内容的元素</param>
* /// <param name="html">要替换的HTML代码</param>
* public static void ReplaceChildsWithHtml( this IHtmlElement element, string html )
* {
* if ( element == null )
* throw new ArgumentNullException( "element" );
*
* var factory = element.Document.GetNodeFactory();
* if ( factory == null )
* throw new NotSupportedException();
*
* lock ( element.SyncRoot )
* {
* ClearNodes( element );
*
* if ( HtmlSpecification.cdataTags.Contains( element.Name, StringComparer.OrdinalIgnoreCase ) )
* {
* var textNode = factory.CreateTextNode( html );
* textNode.Into( element, 0 );
* }
* else
* {
* var fragment = factory.ParseFragment( html );
* fragment.InsertTo( element, 0 );
* }
* }
* }
*/
private static HtmlFragment HtmlEncode(string text, IHtmlNodeFactory factory)
{
if (text == null)
{
throw new ArgumentNullException("text");
}
if (factory == null)
{
throw new ArgumentNullException("factory");
}
var fragment = new HtmlFragment(factory);
var encoded = HtmlEncoding.HtmlEncode(text);
encoded = encoded.Replace("\r\n", "\n").Replace("\r", "\n");
int index = 0, brIndex = 0;
while (true)
{
brIndex = encoded.IndexOf('\n', index);
if (brIndex == -1)
{
if (index < encoded.Length)
{
fragment.AddNode(factory.CreateTextNode(encoded.Substring(index)));
}
break;
}
if (index != brIndex)
{
fragment.AddNode(factory.CreateTextNode(encoded.Substring(index, brIndex - index)));
}
fragment.AddNode(factory.CreateElement("br"));
index = brIndex + 1;
}
return(fragment);
}
