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  };
};


/**
 * @ngdoc directive
 * @name ng.directive:ngList
 *
 * @description
 * Text input that converts between a delimited string and an array of strings. The delimiter
 * can be a fixed string (by default a comma) or a regular expression.
 *
 * @element input
 * @param {string=} ngList optional delimiter that should be used to split the value. If
 *   specified in form `/something/` then the value will be converted into a regular expression.
 *
 * @example
    <doc:example>
      <doc:source>
       <script>
         function Ctrl($scope) {
           $scope.names = ['igor', 'misko', 'vojta'];
         }
       </script>
       <form name="myForm" ng-controller="Ctrl">
         List: <input name="namesInput" ng-model="names" ng-list required>
         <span class="error" ng-show="myForm.namesInput.$error.required">
           Required!</span>
         <br>
         <tt>names = {{names}}</tt><br/>
         <tt>myForm.namesInput.$valid = {{myForm.namesInput.$valid}}</tt><br/>
         <tt>myForm.namesInput.$error = {{myForm.namesInput.$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('names')).toEqual('["igor","misko","vojta"]');
          expect(binding('myForm.namesInput.$valid')).toEqual('true');
          expect(element('span.error').css('display')).toBe('none');
        });

        it('should be invalid if empty', function() {
          input('names').enter('');
          expect(binding('names')).toEqual('');
          expect(binding('myForm.namesInput.$valid')).toEqual('false');
          expect(element('span.error').css('display')).not().toBe('none');
        });
      </doc:scenario>
    </doc:example>
 */
var ngListDirective = function() {
  return {
    require: 'ngModel',
    link: function(scope, element, attr, ctrl) {
      var match = /\/(.*)\//.exec(attr.ngList),
          separator = match && new RegExp(match[1]) || attr.ngList || ',';

      var parse = function(viewValue) {
        // If the viewValue is invalid (say required but empty) it will be `undefined`
        if (isUndefined(viewValue)) return;

        var list = [];

        if (viewValue) {
          forEach(viewValue.split(separator), function(value) {
            if (value) list.push(trim(value));
          });
        }

        return list;
      };

      ctrl.$parsers.push(parse);
      ctrl.$formatters.push(function(value) {
        if (isArray(value)) {
          return value.join(', ');
        }

        return undefined;
      });

      // Override the standard $isEmpty because an empty array means the input is empty.
      ctrl.$isEmpty = function(value) {
        return !value || !value.length;
      };
    }
  };
};


var CONSTANT_VALUE_REGEXP = /^(true|false|\d+)$/;
/**
 * @ngdoc directive
 * @name ng.directive:ngValue
 *
 * @description
 * Binds the given expression to the value of `input[select]` or `input[radio]`, so
 * that when the element is selected, the `ngModel` of that element is set to the
 * bound value.
 *
 * `ngValue` is useful when dynamically generating lists of radio buttons using `ng-repeat`, as
 * shown below.
 *
 * @element input
 * @param {string=} ngValue angular expression, whose value will be bound to the `value` attribute
 *   of the `input` element
 *
 * @example
    <doc:example>
      <doc:source>
       <script>
          function Ctrl($scope) {
            $scope.names = ['pizza', 'unicorns', 'robots'];
            $scope.my = { favorite: 'unicorns' };
          }
       </script>
        <form ng-controller="Ctrl">
          <h2>Which is your favorite?</h2>
            <label ng-repeat="name in names" for="{{name}}">