private static List <MatchedRule> MatchingRules(Dom.ElementData elem, Css.Stylesheet stylesheet)
{
return(stylesheet.Rules
.Select(rule => MatchRule(elem, rule))
.Where(rule => rule != null)
.ToList());
}
private static MatchedRule MatchRule(Dom.ElementData elem, Css.Rule rule)
{
var selector = rule.Selectors.FirstOrDefault(s => Matches(elem, s));
if (selector == null)
{
return(null);
}
return(new MatchedRule(selector.GetSpecificity(), rule));
}
private static bool Matches(Dom.ElementData elem, Css.Selector selector)
{
switch (selector)
{
case Css.SimpleSelector simpleSelector:
return(MatchesSimpleSelector(elem, simpleSelector));
default:
return(false);
}
}
private static Dictionary <string, Css.Value> GetSpecifiedValues(Dom.ElementData elem, Css.Stylesheet stylesheet)
{
var values = new Dictionary <string, Css.Value>();
var rules = MatchingRules(elem, stylesheet)
.OrderBy(rule => rule.Specificity.Calc())
.Select(r => r.Rule);
foreach (var rule in rules)
{
foreach (var declaration in rule.Declarations)
{
values[declaration.Name] = declaration.Value;
}
}
return(values);
}
private static bool MatchesSimpleSelector(Dom.ElementData elem, Css.SimpleSelector selector)
{
if (selector.TagName != "*" && selector.TagName != elem.TagName)
{
return(false);
}
if (selector.Id != "*" && selector.Id != elem.Id)
{
return(false);
}
var elemClasses = elem.Classes;
if (selector.Classes.All(c => c != "*") && selector.Classes.Any(c => !elemClasses.Contains(c)))
{
return(false);
}
return(true);
}
