public IEnumerable <AnalyserResultItem> Analyse(CssAnalyseArgs args)
{
var node = args.Node;
var hashSet = new HashSet <ICssNode>();
var rules = node.GetAll <ICssStyleSheet>().SelectMany(styleSheet => styleSheet.Rules);
foreach (var rule in rules)
{
if (rule.Type == CssRuleType.Unknown)
{
continue;
}
if (hashSet.Add(rule))
{
if (!rule.GetAll <ICssProperty>().Any())
{
yield return(CreateEmptyRuleResultItem(args, rule));
}
}
}
var groups = node.GetAll <ICssGroupingRule>();
foreach (var group in groups)
{
if (group.Type == CssRuleType.Unknown)
{
continue;
}
if (hashSet.Add(group))
{
if (!group.Rules.Any())
{
yield return(CreateEmptyRuleResultItem(args, group));
}
}
}
}
private AnalyserResultItem CreateEmptyRuleResultItem(CssAnalyseArgs args, ICssNode node)
{
string excerpt = null;
if (args.Target == CssAnalyserTargets.HtmlStyleAttribute)
{
excerpt = args.Element.OuterHtml;
}
if (excerpt == null)
{
excerpt = node.ToCss();
}
return(new AnalyserResultItem()
{
Category = Categories.Performance,
Type = AnalyserResultType.Warning,
Message = "Rule is empty",
Excerpt = excerpt
});
}