protected override IEnumerable <LessNode> EvaluateCore(EvaluationContext context)
{
IEnumerable <MediaQuery> CombineQueries(IEnumerable <MediaQuery> outer, IEnumerable <MediaQuery> inner)
{
foreach (var innerQuery in inner)
{
foreach (var outerQuery in outer)
{
yield return(new MediaQuery(outerQuery.FeatureQueries.Concat(innerQuery.FeatureQueries)));
}
}
}
var evaluatedQueries = mediaQueries.Select(q => q.EvaluateSingle <MediaQuery>(context)).ToArray();
using (context.BeginExtenderScope())
{
(var mediaBlocks, var statements) = Block.Evaluate(context).Split <MediaBlock, Statement>();
yield return(new MediaBlock(evaluatedQueries, new RuleBlock(statements), context.Extensions));
foreach (var mediaBlock in mediaBlocks)
{
yield return(new MediaBlock(CombineQueries(evaluatedQueries, mediaBlock.mediaQueries),
mediaBlock.Block, context.Extensions));
}
}
}
