HtmlFormatter
HTML5 markup formatter. Identical to HtmlMarkupFormatter except for < and > which are
encoded in attribute values.
using AngleSharp.Dom;
using AngleSharp.Html;
using System.Runtime.CompilerServices;
using System.Text;
namespace Ganss.Xss
{
[System.Runtime.CompilerServices.NullableContext(1)]
[System.Runtime.CompilerServices.Nullable(0)]
public class HtmlFormatter
{
public static readonly HtmlFormatter Instance = new HtmlFormatter();
protected override string Attribute(IAttr attr)
{
string namespaceUri = attr.get_NamespaceUri();
string localName = attr.get_LocalName();
string value = attr.get_Value();
StringBuilder stringBuilder = new StringBuilder();
if (string.IsNullOrEmpty(namespaceUri))
stringBuilder.Append(localName);
else if (namespaceUri == NamespaceNames.XmlUri) {
stringBuilder.Append(NamespaceNames.XmlPrefix).Append(':').Append(localName);
} else if (namespaceUri == NamespaceNames.XLinkUri) {
stringBuilder.Append(NamespaceNames.XLinkPrefix).Append(':').Append(localName);
} else if (namespaceUri == NamespaceNames.XmlNsUri) {
stringBuilder.Append(HtmlMarkupFormatter.XmlNamespaceLocalName(localName));
} else {
stringBuilder.Append(attr.get_Name());
}
stringBuilder.Append('=').Append('"');
for (int i = 0; i < value.Length; i++) {
switch (value[i]) {
case '&':
stringBuilder.Append("&");
break;
case ' ':
stringBuilder.Append(" ");
break;
case '"':
stringBuilder.Append(""");
break;
case '<':
stringBuilder.Append("<");
break;
case '>':
stringBuilder.Append(">");
break;
default:
stringBuilder.Append(value[i]);
break;
}
}
return stringBuilder.Append('"').ToString();
}
public HtmlFormatter()
: this()
{
}
}
}