/// <summary>
/// Convert idents to functions and remove comments
/// </summary>
private static IEnumerable <CssToken> Normalize1(this IEnumerable <CssToken> reader)
{
using (var e = reader.GetEnumerator())
{
while (e.MoveNext())
{
var idx = (e.Current.ToValue() ?? "").IndexOf('(');
if (e.Current.Type == CssTokenType.Ident && idx > 0)
{
using (var sw = new StringWriter())
using (var writer = new CssWriter(sw))
{
writer.Write(e.Current);
while (!e.Current.ToValue().EndsWith(")") && e.MoveNext())
{
writer.Write(e.Current);
}
sw.Flush();
var tokens = new CssTokenizer(sw.ToString());
foreach (var token in tokens)
{
yield return(token);
}
}
}
else if (e.Current.Type != CssTokenType.Comment &&
e.Current.Type != CssTokenType.Cdc &&
e.Current.Type != CssTokenType.Cdo)
{
yield return(e.Current);
}
}
}
}
private static string SanitizeCss(string css, HtmlSanitizeSettings settings, bool styleTag)
{
using (var sw = new StringWriter())
using (var writer = new CssWriter(sw))
{
foreach (var token in new CssTokenizer(css).Normalize())
{
var prop = token as CssPropertyToken;
var group = token as CssAtGroupToken;
if (prop != null)
{
if (settings.AllowedCssProps.Contains(prop.Data))
{
var removeProp = false;
foreach (var arg in prop)
{
if (arg.Type == CssTokenType.Function && !settings.AllowedCssFunctions.Contains(arg.Data))
{
removeProp = true;
}
else if (arg.Type == CssTokenType.Url)
{
var url = SanitizeUrl(arg.Data, settings);
if (url == null)
{
removeProp = true;
}
}
else if (arg.Data.IndexOf('<') >= 0 || arg.Data.IndexOf('>') >= 0)
{
removeProp = true;
}
}
if (!removeProp)
{
writer.Write(token);
}
}
}
else if (group != null)
{
if (settings.AllowedCssAtRules.Contains(group.Data))
{
writer.Write(group);
}
}
else if (styleTag && (token.Type != CssTokenType.Function || settings.AllowedCssFunctions.Contains(token.Data)))
{
writer.Write(token);
}
}
sw.Flush();
return(sw.ToString());
}
}
public static string ToValue(this CssToken token)
{
var sb = Pool.NewStringBuilder();
using (var sw = new StringWriter(sb))
using (var w = new CssWriter(sw))
{
w.Write(token);
sw.Flush();
return(sb.ToPool());
}
}