Function resolveElementClasses

test/angular/1.3/angular.js:4612–4636

(element, classes)

    }

    function resolveElementClasses(element, classes) {
      var toAdd = [], toRemove = [];

      var hasClasses = createMap();
      forEach((element.attr('class') || '').split(/\s+/), function(className) {
        hasClasses[className] = true;
      });

      forEach(classes, function(status, className) {
        var hasClass = hasClasses[className];

        // If the most recent class manipulation (via $animate) was to remove the class, and the
        // element currently has the class, the class is scheduled for removal. Otherwise, if
        // the most recent class manipulation (via $animate) was to add the class, and the
        // element does not currently have the class, the class is scheduled to be added.
        if (status === false && hasClass) {
          toRemove.push(className);
        } else if (status === true && !hasClass) {
          toAdd.push(className);
        }
      });

      return (toAdd.length + toRemove.length) > 0 &&
        [toAdd.length ? toAdd : null, toRemove.length ? toRemove : null];
    }

    function cachedClassManipulation(cache, classes, op) {
      for (var i=0, ii = classes.length; i < ii; ++i) {