text: 'use strict';
  
  /* global -nullFormCtrl */
  var nullFormCtrl = {
    $addControl: noop,
    $removeControl: noop,
    $setValidity: noop,
    $setDirty: noop,
    $setPristine: noop
  };
  
  /**
   * @ngdoc type
   * @name form.FormController
   *
   * @property {boolean} $pristine True if user has not interacted with the form yet.
   * @property {boolean} $dirty True if user has already interacted with the form.
   * @property {boolean} $valid True if all of the containing forms and controls are valid.
   * @property {boolean} $invalid True if at least one containing control or form is invalid.
   *
   * @property {Object} $error Is an object hash, containing references to all invalid controls or
   *  forms, where:
   *
   *  - keys are validation tokens (error names),
   *  - values are arrays of controls or forms that are invalid for given error name.
   *
   *
   *  Built-in validation tokens:
   *
   *  - `email`
   *  - `max`
   *  - `maxlength`
   *  - `min`
   *  - `minlength`
   *  - `number`
   *  - `pattern`
   *  - `required`
   *  - `url`
   * 
   * @description
   * `FormController` keeps track of all its controls and nested forms as well as state of them,
   * such as being valid/invalid or dirty/pristine.
   *
   * Each {@link directive:form form} directive creates an instance
   * of `FormController`.
   *
   */
  //asks for $scope to fool the BC controller module
  FormController.$inject = ['$element', '$attrs', '$scope'];
  function FormController(element, attrs) {
    var form = this,
        parentForm = element.parent().controller('form') || nullFormCtrl,
        invalidCount = 0, // used to easily determine if we are valid
        errors = form.$error = {},
        controls = [];
  
    // init state
    form.$name = attrs.name || attrs.ngForm;
    form.$dirty = false;
    form.$pristine = true;
    form.$valid = true;
    form.$invalid = false;
  
    parentForm.$addControl(form);
  
    // Setup initial state of the control
    element.addClass(PRISTINE_CLASS);
    toggleValidCss(true);
  
    // convenience method for easy toggling of classes
    function toggleValidCss(isValid, validationErrorKey) {
      validationErrorKey = validationErrorKey ? '-' + snake_case(validationErrorKey, '-') : '';
      element.
        removeClass((isValid ? INVALID_CLASS : VALID_CLASS) + validationErrorKey).
        addClass((isValid ? VALID_CLASS : INVALID_CLASS) + validationErrorKey);
    }
  
    /**
     * @ngdoc method
     * @name $addControl
     * @memberof global:form.FormController
     *
     * @description
     * Register a control with the form.
     *
     * Input elements using ngModelController do this automatically when they are linked.
     */
    form.$addControl = function(control) {
      // Breaking change - before, inputs whose name was "hasOwnProperty" were quietly ignored
      // and not added to the scope.  Now we throw an error.
      assertNotHasOwnProperty(control.$name, 'input');
      controls.push(control);
  
      if (control.$name) {
        form[control.$name] = control;
      }
    };
  
    /**
     * @ngdoc method
     * @name $removeControl
     * @memberof global:form.FormController
     *
     * @description
     * Deregister a control from the form.
     *
     * Input elements using ngModelController do this automatically when they are destroyed.
     */
    form.$removeControl = function(control) {
      if (control.$name && form[control.$name] === control) {
        delete form[control.$name];
      }
      forEach(errors, function(queue, validationToken) {
        form.$setValidity(validationToken, true, control);
      });
  
      arrayRemove(controls, control);
    };
  
    /**
     * @ngdoc method
     * @name $setValidity
     * @memberof global:form.FormController
     *
     * @description
     * Sets the validity of a form control.
     *
     * This method will also propagate to parent forms.
     */
    form.$setValidity = function(validationToken, isValid, control) {
      var queue = errors[validationToken];
  
      if (isValid) {
        if (queue) {
          arrayRemove(queue, control);
          if (!queue.length) {
            invalidCount--;
            if (!invalidCount) {
              toggleValidCss(isValid);
              form.$valid = true;
              form.$invalid = false;
            }
            errors[validationToken] = false;
            toggleValidCss(true, validationToken);
            parentForm.$setValidity(validationToken, true, form);
          }
        }
  
      } else {
        if (!invalidCount) {
          toggleValidCss(isValid);
        }
        if (queue) {
          if (includes(queue, control)) return;
        } else {
          errors[validationToken] = queue = [];
          invalidCount++;
          toggleValidCss(false, validationToken);
          parentForm.$setValidity(validationToken, false, form);
        }
        queue.push(control);
  
        form.$valid = false;
        form.$invalid = true;
      }
    };
  
    /**
     * @ngdoc method
     * @name $setDirty
     * @memberof global:form.FormController
     *
     * @description
     * Sets the form to a dirty state.
     *
     * This method can be called to add the 'ng-dirty' class and set the form to a dirty
     * state (ng-dirty class). This method will also propagate to parent forms.
     */
    form.$setDirty = function() {
      element.removeClass(PRISTINE_CLASS).addClass(DIRTY_CLASS);
      form.$dirty = true;
      form.$pristine = false;
      parentForm.$setDirty();
    };
  
    /**
     * @ngdoc method
     * @name $setPristine
     * @memberof global:form.FormController
     *
     * @description
     * Sets the form to its pristine state.
     *
     * This method can be called to remove the 'ng-dirty' class and set the form to its pristine
     * state (ng-pristine class). This method will also propagate to all the controls contained
     * in this form.
     *
     * Setting a form back to a pristine state is often useful when we want to 'reuse' a form after
     * saving or resetting it.
     */
    form.$setPristine = function () {
      element.removeClass(DIRTY_CLASS).addClass(PRISTINE_CLASS);
      form.$dirty = false;
      form.$pristine = true;
      forEach(controls, function(control) {
        control.$setPristine();
      });
    };
  }
  
  
  /**
   * @ngdoc directive
   * @name ngForm
   * @restrict EAC
   *
   * @description
   * Nestable alias of {@link directive:form `form`} directive. HTML
   * does not allow nesting of form elements. It is useful to nest forms, for example if the validity of a
   * sub-group of controls needs to be determined.
   *
   * @param {string=} ngForm|name Name of the form. If specified, the form controller will be published into
   *                       related scope, under this name.
   *
   */
  
   /**
   * @ngdoc directive
   * @name form
   * @restrict E
   *
   * @description
   * Directive that instantiates
   * {@link global:form.FormController FormController}.
   *
   * If the `name` attribute is specified, the form controller is published onto the current scope under
   * this name.
   *
   * # Alias: {@link directive:ngForm `ngForm`}
   *
   * In Angular forms can be nested. This means that the outer form is valid when all of the child
   * forms are valid as well. However, browsers do not allow nesting of `<form>` elements, so
   * Angular provides the {@link directive:ngForm `ngForm`} directive which behaves identically to
   * `<form>` but can be nested.  This allows you to have nested forms, which is very useful when
   * using Angular validation directives in forms that are dynamically generated using the
   * {@link directive:ngRepeat `ngRepeat`} directive. Since you cannot dynamically generate the `name`
   * attribute of input elements using interpolation, you have to wrap each set of repeated inputs in an
   * `ngForm` directive and nest these in an outer `form` element.
   *
   *
   * # CSS classes
   *  - `ng-valid` Is set if the form is valid.
   *  - `ng-invalid` Is set if the form is invalid.
   *  - `ng-pristine` Is set if the form is pristine.
   *  - `ng-dirty` Is set if the form is dirty.
   *
   *
   * # Submitting a form and preventing the default action
   *
   * Since the role of forms in client-side Angular applications is different than in classical
   * roundtrip apps, it is desirable for the browser not to translate the form submission into a full
   * page reload that sends the data to the server. Instead some javascript logic should be triggered
   * to handle the form submission in an application-specific way.
   *
   * For this reason, Angular prevents the default action (form submission to the server) unless the
   * `<form>` element has an `action` attribute specified.
   *
   * You can use one of the following two ways to specify what javascript method should be called when
   * a form is submitted:
   *
   * - {@link directive:ngSubmit ngSubmit} directive on the form element
   * - {@link directive:ngClick ngClick} directive on the first
    *  button or input field of type submit (input[type=submit])
   *
   * To prevent double execution of the handler, use only one of the {@link directive:ngSubmit ngSubmit}
   * or {@link directive:ngClick ngClick} directives.
   * This is because of the following form submission rules in the HTML specification:
   *
   * - If a form has only one input field then hitting enter in this field triggers form submit
   * (`ngSubmit`)
   * - if a form has 2+ input fields and no buttons or input[type=submit] then hitting enter
   * doesn't trigger submit
   * - if a form has one or more input fields and one or more buttons or input[type=submit] then
   * hitting enter in any of the input fields will trigger the click handler on the *first* button or
   * input[type=submit] (`ngClick`) *and* a submit handler on the enclosing form (`ngSubmit`)
   *
   * @param {string=} name Name of the form. If specified, the form controller will be published into
   *                       related scope, under this name.
   *
   * @example
      <doc:example>
        <doc:source>
         <script>
           function Ctrl($scope) {
             $scope.userType = 'guest';
           }
         </script>
         <form name="myForm" ng-controller="Ctrl">
           userType: <input name="input" ng-model="userType" required>
           <span class="error" ng-show="myForm.input.$error.required">Required!</span><br>
           <tt>userType = {{userType}}</tt><br>
           <tt>myForm.input.$valid = {{myForm.input.$valid}}</tt><br>
           <tt>myForm.input.$error = {{myForm.input.$error}}</tt><br>
           <tt>myForm.$valid = {{myForm.$valid}}</tt><br>
           <tt>myForm.$error.required = {{!!myForm.$error.required}}</tt><br>
          </form>
        </doc:source>
        <doc:scenario>
          it('should initialize to model', function() {
           expect(binding('userType')).toEqual('guest');
           expect(binding('myForm.input.$valid')).toEqual('true');
          });
  
          it('should be invalid if empty', function() {
           input('userType').enter('');
           expect(binding('userType')).toEqual('');
           expect(binding('myForm.input.$valid')).toEqual('false');
          });
        </doc:scenario>
      </doc:example>
   */
  var formDirectiveFactory = function(isNgForm) {
    return ['$timeout', function($timeout) {
      var formDirective = {
        name: 'form',
        restrict: isNgForm ? 'EAC' : 'E',
        controller: FormController,
        compile: function() {
          return {
            pre: function(scope, formElement, attr, controller) {
              if (!attr.action) {
                // we can't use jq events because if a form is destroyed during submission the default
                // action is not prevented. see #1238
                //
                // IE 9 is not affected because it doesn't fire a submit event and try to do a full
                // page reload if the form was destroyed by submission of the form via a click handler
                // on a button in the form. Looks like an IE9 specific bug.
                var preventDefaultListener = function(event) {
                  event.preventDefault
                    ? event.preventDefault()
                    : event.returnValue = false; // IE
                };
  
                addEventListenerFn(formElement[0], 'submit', preventDefaultListener);
  
                // unregister the preventDefault listener so that we don't not leak memory but in a
                // way that will achieve the prevention of the default action.
                formElement.on('$destroy', function() {
                  $timeout(function() {
                    removeEventListenerFn(formElement[0], 'submit', preventDefaultListener);
                  }, 0, false);
                });
              }
  
              var parentFormCtrl = formElement.parent().controller('form'),
                  alias = attr.name || attr.ngForm;
  
              if (alias) {
                setter(scope, alias, controller, alias);
              }
              if (parentFormCtrl) {
                formElement.on('$destroy', function() {
                  parentFormCtrl.$removeControl(controller);
                  if (alias) {
                    setter(scope, alias, undefined, alias);
                  }
                  extend(controller, nullFormCtrl); //stop propagating child destruction handlers upwards
                });
              }
            }
          };
        }
      };
  
      return formDirective;
    }];
  };
  
  var formDirective = formDirectiveFactory();
  var ngFormDirective = formDirectiveFactory(true);
  