Function condense

2.0.3/Sizzle.js:1580–1599

(unmatched, map, filter, context, xml)

        }

        function condense(unmatched, map, filter, context, xml) {
            var elem,
                newUnmatched = [],
                i = 0,
                len = unmatched.length,
                mapped = map != null;

            for (; i < len; i++) {
                if ((elem = unmatched[i])) {
                    if (!filter || filter(elem, context, xml)) {
                        newUnmatched.push(elem);
                        if (mapped) {
                            map.push(i);
                        }
                    }
                }
            }

            return newUnmatched;
        }

        function setMatcher(preFilter, selector, matcher, postFilter, postFinder, postSelector) {
            if (postFilter && !postFilter[expando]) {