Function orderByFilter

code/songhop/www/lib/angular/angular.js:17530–17610

($parse)

 */
orderByFilter.$inject = ['$parse'];
function orderByFilter($parse) {
  return function(array, sortPredicate, reverseOrder) {
    if (!(isArrayLike(array))) return array;
    sortPredicate = isArray(sortPredicate) ? sortPredicate : [sortPredicate];
    if (sortPredicate.length === 0) { sortPredicate = ['+']; }
    sortPredicate = sortPredicate.map(function(predicate) {
      var descending = false, get = predicate || identity;
      if (isString(predicate)) {
        if ((predicate.charAt(0) == '+' || predicate.charAt(0) == '-')) {
          descending = predicate.charAt(0) == '-';
          predicate = predicate.substring(1);
        }
        if (predicate === '') {
          // Effectively no predicate was passed so we compare identity
          return reverseComparator(function(a, b) {
            return compare(a, b);
          }, descending);
        }
        get = $parse(predicate);
        if (get.constant) {
          var key = get();
          return reverseComparator(function(a, b) {
            return compare(a[key], b[key]);
          }, descending);
        }
      }
      return reverseComparator(function(a, b) {
        return compare(get(a),get(b));
      }, descending);
    });
    return slice.call(array).sort(reverseComparator(comparator, reverseOrder));

    function comparator(o1, o2) {
      for (var i = 0; i < sortPredicate.length; i++) {
        var comp = sortPredicate[i](o1, o2);
        if (comp !== 0) return comp;
      }
      return 0;
    }
    function reverseComparator(comp, descending) {
      return descending
          ? function(a, b) {return comp(b,a);}
          : comp;
    }
    function compare(v1, v2) {
      var t1 = typeof v1;
      var t2 = typeof v2;
      // Prepare values for Abstract Relational Comparison
      // (http://www.ecma-international.org/ecma-262/5.1/#sec-11.8.5):
      // If the resulting values are identical, return 0 to prevent
      // incorrect re-ordering.
      if (t1 === t2 && t1 === "object") {
        // If types are both numbers, emulate abstract ToPrimitive() operation
        // in order to get primitive values suitable for comparison
        t1 = typeof (v1.valueOf ? v1 = v1.valueOf() : v1);
        t2 = typeof (v2.valueOf ? v2 = v2.valueOf() : v2);
        if (t1 === t2 && t1 === "object") {
          // Object.prototype.valueOf will return the original object, by