public Ruleset Evaluate(NodeList<Expression> args, Env env)
{
if(args)
Guard.ExpectMaxArguments(Params.Count, args.Count, string.Format("'{0}'", Name));
var frame = new Ruleset(null, new List<Node>());
for (var i = 0; i < Params.Count; i++)
{
if (!string.IsNullOrEmpty(Params[i].Name))
{
Node val;
if (args && i < args.Count)
val = args[i];
else
val = Params[i].Value;
if (val)
frame.Rules.Add(new Rule(Params[i].Name, val));
else
throw new ParsingException("wrong number of arguments for " + Name);
}
}
var frames = new[] {this, frame}.Concat(env.Frames).Reverse();
var context = new Env{ Frames = new Stack<Ruleset>(frames) };
var newRules = new List<Node>();
foreach (var rule in Rules)
{
if (rule is Mixin.Definition)
{
var mixin = rule as Mixin.Definition;
var parameters = mixin.Params.Concat(frame.Rules.Cast<Rule>());
newRules.Add(new Mixin.Definition(mixin.Name, new NodeList<Rule>(parameters), mixin.Rules));
}
else if (rule is Ruleset)
{
var ruleset = (rule as Ruleset);
var rules = ruleset.Rules
.Select(r => r.Evaluate(context))
.ToList();
newRules.Add(new Ruleset(ruleset.Selectors, rules));
}
else if (rule is Mixin.Call)
{
newRules.AddRange((NodeList)rule.Evaluate(context));
}
else
{
newRules.Add(rule.Evaluate(context));
}
}
return new Ruleset(null, newRules);
}
public Ruleset Parse(string input)
{
Tokenizer.SetupInput(input);
ParsingException parsingException = null;
Ruleset root = null;
try
{
var parsers = new Parsers(new DefaultNodeProvider());
root = new Ruleset(new NodeList<Selector>(), parsers.Primary(this));
root.Root = true;
}
catch (ParsingException e)
{
parsingException = e;
}
CheckForParsingError(parsingException);
return root;
}
public NodeList Find(Selector selector, Ruleset self)
{
self = self ?? this;
var rules = new NodeList();
var key = selector.ToCSS();
if (_lookups.ContainsKey(key))
return _lookups[key];
foreach (var rule in Rulesets().Where(rule => rule != self))
{
if (rule.Selectors && rule.Selectors.Any(selector.Match))
{
if (selector.Elements.Count > 1)
{
var remainingSelectors = new Selector(new NodeList<Element>(selector.Elements.Skip(1)));
rules.AddRange(rule.Find(remainingSelectors, self));
}
else
rules.Add(rule);
}
}
return _lookups[key] = rules;
}