public List <Closure> Find(Env env, Selector selector, Ruleset self)
{
self = self ?? this;
var rules = new List <Closure>();
var key = selector.ToCSS(env);
if (_lookups.ContainsKey(key))
{
return(_lookups[key]);
}
var validRulesets = Rulesets().Where(rule =>
{
if (rule != self)
{
return(true);
}
MixinDefinition mixinRule = rule as MixinDefinition;
if (mixinRule != null)
{
return(mixinRule.Condition != null);
}
return(false);
});
foreach (var rule in validRulesets)
{
if (rule.Selectors && rule.Selectors.Any(selector.Match))
{
if (selector.Elements.Count > 1)
{
var remainingSelectors = new Selector(new NodeList <Element>(selector.Elements.Skip(1)));
var closures = rule.Find(env, remainingSelectors, self);
foreach (var closure in closures)
{
closure.Context.Insert(0, rule);
}
rules.AddRange(closures);
}
else
{
rules.Add(new Closure {
Ruleset = rule, Context = new List <Ruleset> {
rule
}
});
}
}
}
return(_lookups[key] = rules);
}
public List <Closure> Find <TRuleset>(Env env, Selector selector, Ruleset self) where TRuleset : Ruleset
{
self = self ?? this;
var rules = new List <Closure>();
var key = typeof(TRuleset).ToString() + ":" + selector.ToCSS(env);
if (_lookups.ContainsKey(key))
{
return(_lookups[key]);
}
var validRulesets = Rulesets().Where(rule =>
{
if (!typeof(TRuleset).IsAssignableFrom(rule.GetType()))
{
return(false);
}
if (rule != self)
{
return(true);
}
MixinDefinition mixinRule = rule as MixinDefinition;
if (mixinRule != null)
{
return(mixinRule.Condition != null);
}
return(false);
});
foreach (var rule in validRulesets)
{
if (rule.Selectors && rule.Selectors.Any(selector.Match))
{
if ((selector.Elements.Count == 1) || rule.Selectors.Any(s => s.ToCSS(new Env()) == selector.ToCSS(new Env())))
{
rules.Add(new Closure {
Ruleset = rule, Context = new List <Ruleset> {
rule
}
});
}
else if (selector.Elements.Count > 1)
{
var remainingSelectors = new Selector(new NodeList <Element>(selector.Elements.Skip(1)));
var closures = rule.Find <Ruleset>(env, remainingSelectors, self);
foreach (var closure in closures)
{
closure.Context.Insert(0, rule);
}
rules.AddRange(closures);
}
}
}
return(_lookups[key] = rules);
}
private IEnumerable <Closure> FindInternal(Env env, Selector selector, Ruleset self, Context context)
{
if (!selector.Elements.Any())
{
return(Enumerable.Empty <Closure>());
}
string selectorCss = selector.ToCSS(env);
var key = selectorCss;
if (_lookups.ContainsKey(key))
{
return(_lookups[key]);
}
self = self ?? this;
var rules = new List <Closure>();
var bestMatch = context.Select(selectors => new Selector(selectors.SelectMany(s => s.Elements)))
.Where(m => m.Elements.IsSubsequenceOf(selector.Elements, ElementValuesEqual))
.OrderByDescending(m => m.Elements.Count)
.FirstOrDefault();
if (bestMatch != null && bestMatch.Elements.Count == selector.Elements.Count)
{
// exact match, good to go
rules.Add(new Closure {
Context = new List <Ruleset> {
this
}, Ruleset = this
});
}
var validRulesets = Rulesets().Where(rule =>
{
if (rule != self)
{
return(true);
}
MixinDefinition mixinRule = rule as MixinDefinition;
if (mixinRule != null)
{
return(mixinRule.Condition != null);
}
return(false);
});
foreach (var rule in validRulesets)
{
if (rule.Selectors == null)
{
continue;
}
var childContext = new Context();
childContext.AppendSelectors(context, rule.Selectors);
var closures = rule.FindInternal(env, selector, self, childContext);
foreach (var closure in closures)
{
closure.Context.Insert(0, this);
rules.Add(closure);
}
}
return(_lookups[key] = rules);
}