jasmine/src/core/QueueRunner.js

getJasmineRequireObj().QueueRunner = function() {

  function QueueRunner(attrs) {
    this.fns = attrs.fns || [];
    this.onComplete = attrs.onComplete || function() {};
    this.clearStack = attrs.clearStack || function(fn) {fn();};
    this.onException = attrs.onException || function() {};
    this.catchException = attrs.catchException || function() { return true; };
    this.userContext = {};
  }

  QueueRunner.prototype.execute = function() {
    this.run(this.fns, 0);
  };

  QueueRunner.prototype.run = function(fns, recursiveIndex) {
    var length = fns.length,
        self = this,
        iterativeIndex;

    for(iterativeIndex = recursiveIndex; iterativeIndex < length; iterativeIndex++) {
      var fn = fns[iterativeIndex];
      if (fn.length > 0) {
        return attemptAsync(fn);
      } else {
        attemptSync(fn);
      }
    }

    var runnerDone = iterativeIndex >= length;

    if (runnerDone) {
      this.clearStack(this.onComplete);
    }

    function attemptSync(fn) {
      try {
        fn.call(self.userContext);
      } catch (e) {
        handleException(e);
      }
    }

    function attemptAsync(fn) {
      var next = function () { self.run(fns, iterativeIndex + 1); };

      try {
        fn.call(self.userContext, next);
      } catch (e) {
        handleException(e);
        next();
      }
    }

    function handleException(e) {
      self.onException(e);
      if (!self.catchException(e)) {
        //TODO: set a var when we catch an exception and
        //use a finally block to close the loop in a nice way..
        throw e;
      }
    }
  };

  return QueueRunner;
};