/// <summary>
/// Evaluate Rules. Must only be run on a copy of the ruleset otherwise it will
/// overwrite defintions that might be required later..
/// </summary>
protected void EvaluateRules(Env env)
{
env.Frames.Push(this);
for (var i = 0; i < Selectors.Count; i++)
{
var evaluatedSelector = Selectors[i].Evaluate(env);
var expandedSelectors = evaluatedSelector as IEnumerable <Selector>;
if (expandedSelectors != null)
{
Selectors.RemoveAt(i);
Selectors.InsertRange(i, expandedSelectors);
}
else
{
Selectors[i] = evaluatedSelector as Selector;
}
}
int mediaBlocks = env.MediaBlocks.Count;
NodeHelper.ExpandNodes <Import>(env, Rules);
NodeHelper.ExpandNodes <MixinCall>(env, Rules);
foreach (var r in Rules.OfType <Extend>().ToArray())
{
foreach (var s in this.Selectors)
{
//If we're in a media block, then extenders can only apply to that media block
if (env.MediaPath.Any())
{
env.MediaPath.Peek().AddExtension(s, (Extend)r.Evaluate(env), env);
}
else //Global extend
{
env.AddExtension(s, (Extend)r.Evaluate(env), env);
}
}
}
for (var i = 0; i < Rules.Count; i++)
{
Rules[i] = Rules[i].Evaluate(env);
}
// if media blocks are inside this ruleset we have to "catch" the bubbling and
// make sure they get this rulesets selectors
for (var j = mediaBlocks; j < env.MediaBlocks.Count; j++)
{
env.MediaBlocks[j].BubbleSelectors(Selectors);
}
env.Frames.Pop();
}
