/*
* /// <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);
}
/// <summary>
/// 创建文本节点的副本
/// </summary>
/// <param name="factory">用于创建文本节点的构建器</param>
/// <param name="textNode">需要被创建副本的文本节点</param>
/// <returns>文本节点的未分配副本</returns>
public static IFreeTextNode MakeCopy(this IHtmlNodeFactory factory, IHtmlTextNode textNode)
{
return(factory.CreateTextNode(textNode.HtmlText));
}
