//
// Combinators combine elements together, in a Selector.
//
// Because our parser isn't white-space sensitive, special care
// has to be taken, when parsing the descendant combinator, ` `,
// as it's an empty space. We have to check the previous character
// in the input, to see if it's a ` ` character. More info on how
// we deal with this in *combinator.js*.
//
public Combinator Combinator(Parser parser)
{
var index = parser.Tokenizer.Location.Index;
Node match;
if (match = parser.Tokenizer.Match(@"[+>~]") || parser.Tokenizer.Match(@"&\s?") || parser.Tokenizer.Match(@"::"))
{
return(NodeProvider.Combinator(match.ToString(), index));
}
return(NodeProvider.Combinator(char.IsWhiteSpace(parser.Tokenizer.GetPreviousCharIgnoringComments()) ? " " : null, index));
}
//
// Mixins
//
//
// A Mixin call, with an optional argument list
//
// #mixins > .square(#fff);
// .rounded(4px, black);
// .button;
//
// The `while` loop is there because mixins can be
// namespaced, but we only support the child and descendant
// selector for now.
//
public MixinCall MixinCall(Parser parser)
{
var elements = new NodeList <Element>();
var index = parser.Tokenizer.Location.Index;
RegexMatchResult e;
Combinator c = null;
PushComments();
for (var i = parser.Tokenizer.Location.Index; e = parser.Tokenizer.Match(@"[#.][a-zA-Z0-9_-]+"); i = parser.Tokenizer.Location.Index)
{
elements.Add(NodeProvider.Element(c, e.Value, i));
i = parser.Tokenizer.Location.Index;
var match = parser.Tokenizer.Match('>');
c = match != null?NodeProvider.Combinator(match.Value, i) : null;
}
var args = new List <NamedArgument>();
if (parser.Tokenizer.Match('('))
{
Expression arg;
while (arg = Expression(parser))
{
var value = arg;
string name = null;
if (arg.Value.Count == 1 && arg.Value[0] is Variable)
{
if (parser.Tokenizer.Match(':'))
{
if (value = Expression(parser))
{
name = (arg.Value[0] as Variable).Name;
}
else
{
throw new ParsingException("Expected value", parser.Tokenizer.Location.Index);
}
}
}
args.Add(new NamedArgument {
Name = name, Value = value
});
if (!parser.Tokenizer.Match(','))
{
break;
}
}
if (!parser.Tokenizer.Match(')'))
{
throw new ParsingException("Expected ')'", parser.Tokenizer.Location.Index);
}
}
if (elements.Count > 0)
{
// if elements then we've picked up chars so don't need to worry about remembering
var postComments = GatherAndPullComments(parser);
if (End(parser))
{
var mixinCall = NodeProvider.MixinCall(elements, args, index);
mixinCall.PostComments = postComments;
PopComments();
return(mixinCall);
}
}
PopComments();
return(null);
}