angular-scroll-animate/bower_components/jasmine/src/core/Queue.js

An Angular.js directive which allows you to perform any javascript actions (in the controller, or on the element) when an element is scrolled into, or out of, the users viewport, without any other dependencies.

jasmine.Queue = function(env) {
  this.env = env;

  // parallel to blocks. each true value in this array means the block will
  // get executed even if we abort
  this.ensured = [];
  this.blocks = [];
  this.running = false;
  this.index = 0;
  this.offset = 0;
  this.abort = false;
};

jasmine.Queue.prototype.addBefore = function(block, ensure) {
  if (ensure === jasmine.undefined) {
    ensure = false;
  }

  this.blocks.unshift(block);
  this.ensured.unshift(ensure);
};

jasmine.Queue.prototype.add = function(block, ensure) {
  if (ensure === jasmine.undefined) {
    ensure = false;
  }

  this.blocks.push(block);
  this.ensured.push(ensure);
};

jasmine.Queue.prototype.insertNext = function(block, ensure) {
  if (ensure === jasmine.undefined) {
    ensure = false;
  }

  this.ensured.splice((this.index + this.offset + 1), 0, ensure);
  this.blocks.splice((this.index + this.offset + 1), 0, block);
  this.offset++;
};

jasmine.Queue.prototype.start = function(onComplete) {
  this.running = true;
  this.onComplete = onComplete;
  this.next_();
};

jasmine.Queue.prototype.isRunning = function() {
  return this.running;
};

jasmine.Queue.LOOP_DONT_RECURSE = true;

jasmine.Queue.prototype.next_ = function() {
  var self = this;
  var goAgain = true;

  while (goAgain) {
    goAgain = false;
    
    if (self.index < self.blocks.length && !(this.abort && !this.ensured[self.index])) {
      var calledSynchronously = true;
      var completedSynchronously = false;

      var onComplete = function () {
        if (jasmine.Queue.LOOP_DONT_RECURSE && calledSynchronously) {
          completedSynchronously = true;
          return;
        }

        if (self.blocks[self.index].abort) {
          self.abort = true;
        }

        self.offset = 0;
        self.index++;

        var now = new Date().getTime();
        if (self.env.updateInterval && now - self.env.lastUpdate > self.env.updateInterval) {
          self.env.lastUpdate = now;
          self.env.setTimeout(function() {
            self.next_();
          }, 0);
        } else {
          if (jasmine.Queue.LOOP_DONT_RECURSE && completedSynchronously) {
            goAgain = true;
          } else {
            self.next_();
          }
        }
      };
      self.blocks[self.index].execute(onComplete);

      calledSynchronously = false;
      if (completedSynchronously) {
        onComplete();
      }
      
    } else {
      self.running = false;
      if (self.onComplete) {
        self.onComplete();
      }
    }
  }
};

jasmine.Queue.prototype.results = function() {
  var results = new jasmine.NestedResults();
  for (var i = 0; i < this.blocks.length; i++) {
    if (this.blocks[i].results) {
      results.addResult(this.blocks[i].results());
    }
  }
  return results;
};