code: function(content, pos, sanitize) {
  			if (sanitize) {
  				content = this.sanitize(content);
  			}
  
  			var stream = stringStream(content);
  			stream.start = stream.pos = pos;
  			var stack = [], ranges = [];
  			var ch;
  			while (ch = stream.next()) {
  				if (ch == '{') {
  					stack.push(stream.pos - 1);
  				} else if (ch == '}') {
  					if (!stack.length) {
  						throw 'Invalid source structure (check for curly braces)';
  					}
  					ranges.push(range.create2(stack.pop(), stream.pos));
  					if (!stack.length) {
  						return ranges;
  					}
  				} else {
  					stream.skipQuoted();
  				}
  			}
  
  			return ranges;
  		}
docs: Matches curly braces content right after given position
  @param  {String} content CSS content. Must not contain comments!
  @param  {Number} pos     Search start position
  @return {Range}