refact(input): split input.js into smaller files

The input.js file is unnecessarily large, containing many directives including the
vast `ngModel`. This change moves ngModel and a few other directives into their
own files, which will make maintenance easier.

Author: petebacondarwin

angularFiles.js

@@ -53,6 +53,7 @@ var angularFiles = {
     'src/ng/directive/form.js',
     'src/ng/directive/input.js',
     'src/ng/directive/ngBind.js',
+    'src/ng/directive/ngChange.js',
     'src/ng/directive/ngClass.js',
     'src/ng/directive/ngCloak.js',
     'src/ng/directive/ngController.js',
@@ -61,6 +62,8 @@ var angularFiles = {
     'src/ng/directive/ngIf.js',
     'src/ng/directive/ngInclude.js',
     'src/ng/directive/ngInit.js',
+    'src/ng/directive/ngList.js',
+    'src/ng/directive/ngModel.js',
     'src/ng/directive/ngNonBindable.js',
     'src/ng/directive/ngPluralize.js',
     'src/ng/directive/ngRepeat.js',
@@ -70,7 +73,8 @@ var angularFiles = {
     'src/ng/directive/ngTransclude.js',
     'src/ng/directive/script.js',
     'src/ng/directive/select.js',
-    'src/ng/directive/style.js'
+    'src/ng/directive/style.js',
+    'src/ng/directive/validators.js'
   ],
 
   'angularLoader': [

src/ng/directive/input.js

@@ -0,0 +1,78 @@
+'use strict';
+
+/**
+ * @ngdoc directive
+ * @name ngChange
+ *
+ * @description
+ * Evaluate the given expression when the user changes the input.
+ * The expression is evaluated immediately, unlike the JavaScript onchange event
+ * which only triggers at the end of a change (usually, when the user leaves the
+ * form element or presses the return key).
+ *
+ * The `ngChange` expression is only evaluated when a change in the input value causes
+ * a new value to be committed to the model.
+ *
+ * It will not be evaluated:
+ * * if the value returned from the `$parsers` transformation pipeline has not changed
+ * * if the input has continued to be invalid since the model will stay `null`
+ * * if the model is changed programmatically and not by a change to the input value
+ *
+ *
+ * Note, this directive requires `ngModel` to be present.
+ *
+ * @element input
+ * @param {expression} ngChange {@link guide/expression Expression} to evaluate upon change
+ * in input value.
+ *
+ * @example
+ * <example name="ngChange-directive" module="changeExample">
+ *   <file name="index.html">
+ *     <script>
+ *       angular.module('changeExample', [])
+ *         .controller('ExampleController', ['$scope', function($scope) {
+ *           $scope.counter = 0;
+ *           $scope.change = function() {
+ *             $scope.counter++;
+ *           };
+ *         }]);
+ *     </script>
+ *     <div ng-controller="ExampleController">
+ *       <input type="checkbox" ng-model="confirmed" ng-change="change()" id="ng-change-example1" />
+ *       <input type="checkbox" ng-model="confirmed" id="ng-change-example2" />
+ *       <label for="ng-change-example2">Confirmed</label><br />
+ *       <tt>debug = {{confirmed}}</tt><br/>
+ *       <tt>counter = {{counter}}</tt><br/>
+ *     </div>
+ *   </file>
+ *   <file name="protractor.js" type="protractor">
+ *     var counter = element(by.binding('counter'));
+ *     var debug = element(by.binding('confirmed'));
+ *
+ *     it('should evaluate the expression if changing from view', function() {
+ *       expect(counter.getText()).toContain('0');
+ *
+ *       element(by.id('ng-change-example1')).click();
+ *
+ *       expect(counter.getText()).toContain('1');
+ *       expect(debug.getText()).toContain('true');
+ *     });
+ *
+ *     it('should not evaluate the expression if changing from model', function() {
+ *       element(by.id('ng-change-example2')).click();
+
+ *       expect(counter.getText()).toContain('0');
+ *       expect(debug.getText()).toContain('true');
+ *     });
+ *   </file>
+ * </example>
+ */
+var ngChangeDirective = valueFn({
+  restrict: 'A',
+  require: 'ngModel',
+  link: function(scope, element, attr, ctrl) {
+    ctrl.$viewChangeListeners.push(function() {
+      scope.$eval(attr.ngChange);
+    });
+  }
+});

src/ng/directive/ngChange.js

@@ -0,0 +1,128 @@
+'use strict';
+
+
+/**
+ * @ngdoc directive
+ * @name ngList
+ *
+ * @description
+ * Text input that converts between a delimited string and an array of strings. The default
+ * delimiter is a comma followed by a space - equivalent to `ng-list=", "`. You can specify a custom
+ * delimiter as the value of the `ngList` attribute - for example, `ng-list=" | "`.
+ *
+ * The behaviour of the directive is affected by the use of the `ngTrim` attribute.
+ * * If `ngTrim` is set to `"false"` then whitespace around both the separator and each
+ *   list item is respected. This implies that the user of the directive is responsible for
+ *   dealing with whitespace but also allows you to use whitespace as a delimiter, such as a
+ *   tab or newline character.
+ * * Otherwise whitespace around the delimiter is ignored when splitting (although it is respected
+ *   when joining the list items back together) and whitespace around each list item is stripped
+ *   before it is added to the model.
+ *
+ * ### Example with Validation
+ *
+ * <example name="ngList-directive" module="listExample">
+ *   <file name="app.js">
+ *      angular.module('listExample', [])
+ *        .controller('ExampleController', ['$scope', function($scope) {
+ *          $scope.names = ['morpheus', 'neo', 'trinity'];
+ *        }]);
+ *   </file>
+ *   <file name="index.html">
+ *    <form name="myForm" ng-controller="ExampleController">
+ *      List: <input name="namesInput" ng-model="names" ng-list required>
+ *      <span class="error" ng-show="myForm.namesInput.$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>
+ *   </file>
+ *   <file name="protractor.js" type="protractor">
+ *     var listInput = element(by.model('names'));
+ *     var names = element(by.exactBinding('names'));
+ *     var valid = element(by.binding('myForm.namesInput.$valid'));
+ *     var error = element(by.css('span.error'));
+ *
+ *     it('should initialize to model', function() {
+ *       expect(names.getText()).toContain('["morpheus","neo","trinity"]');
+ *       expect(valid.getText()).toContain('true');
+ *       expect(error.getCssValue('display')).toBe('none');
+ *     });
+ *
+ *     it('should be invalid if empty', function() {
+ *       listInput.clear();
+ *       listInput.sendKeys('');
+ *
+ *       expect(names.getText()).toContain('');
+ *       expect(valid.getText()).toContain('false');
+ *       expect(error.getCssValue('display')).not.toBe('none');
+ *     });
+ *   </file>
+ * </example>
+ *
+ * ### Example - splitting on whitespace
+ * <example name="ngList-directive-newlines">
+ *   <file name="index.html">
+ *    <textarea ng-model="list" ng-list="&#10;" ng-trim="false"></textarea>
+ *    <pre>{{ list | json }}</pre>
+ *   </file>
+ *   <file name="protractor.js" type="protractor">
+ *     it("should split the text by newlines", function() {
+ *       var listInput = element(by.model('list'));
+ *       var output = element(by.binding('list | json'));
+ *       listInput.sendKeys('abc\ndef\nghi');
+ *       expect(output.getText()).toContain('[\n  "abc",\n  "def",\n  "ghi"\n]');
+ *     });
+ *   </file>
+ * </example>
+ *
+ * @element input
+ * @param {string=} ngList optional delimiter that should be used to split the value.
+ */
+var ngListDirective = function() {
+  return {
+    restrict: 'A',
+    priority: 100,
+    require: 'ngModel',
+    link: function(scope, element, attr, ctrl) {
+      // We want to control whitespace trimming so we use this convoluted approach
+      // to access the ngList attribute, which doesn't pre-trim the attribute
+      var ngList = element.attr(attr.$attr.ngList) || ', ';
+      var trimValues = attr.ngTrim !== 'false';
+      var separator = trimValues ? trim(ngList) : 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(trimValues ? trim(value) : value);
+          });
+        }
+
+        return list;
+      };
+
+      ctrl.$parsers.push(parse);
+      ctrl.$formatters.push(function(value) {
+        if (isArray(value)) {
+          return value.join(ngList);
+        }
+
+        return undefined;
+      });
+
+      // Override the standard $isEmpty because an empty array means the input is empty.
+      ctrl.$isEmpty = function(value) {
+        return !value || !value.length;
+      };
+    }
+  };
+};