Revert revision 33053

third_party/pkg/angular/lib/directive/ng_model_validators.dart

 part of angular.directive;
 
-abstract class NgValidatable {
-  String get name;
-  bool isValid(value); 
+/**
+ * _NgModelValidator refers to the required super-class which is used when creating
+ * validation services that are used with [ngModel]. It is expected that any child-classes
+ * that inherit from this perform the necessary logic to return a simple true/false response
+ * when validating the contents of the model data.
+ */
+abstract class _NgModelValidator {
+  final dom.Element inputElement;
+  final NgModel ngModel;
+  final Scope scope;
+  bool _listening = false;
+
+  _NgModelValidator(dom.Element this.inputElement, NgModel this.ngModel, Scope this.scope);
+
+  /**
+   * Registers the validator with to attached model.
+   */
+  bool listen() {
+    if(!_listening) {
+      _listening = true;
+      this.ngModel.addValidator(this);
+    }
+  }
+
+  get value => ngModel.viewValue;
+
+  /**
+   * De-registers the validator with to attached model.
+   */
+  bool unlisten() {
+    if(_listening) {
+      _listening = false;
+      this.ngModel.removeValidator(this);
+    }
+  }
+
+  /**
+   * Returns true/false depending on the status of the validator's validation mechanism
+   */
+  bool isValid();
 }
 
 /**
  * Validates the model depending if required or ng-required is present on the element.
  */
-@NgDirective(
-    selector: '[ng-model][required]')
-@NgDirective(
-    selector: '[ng-model][ng-required]',
-    map: const {'ng-required': '=>required'})
-class NgModelRequiredValidator implements NgValidatable {
-  bool _required = true;
+@NgDirective(selector: '[ng-model][required]')
+@NgDirective(selector: '[ng-model][ng-required]', map: const {'ng-required': '=>required'})
+class NgModelRequiredValidator extends _NgModelValidator {
+  bool _required;
+  get name => 'required';
 
-  String get name => 'required';
+  NgModelRequiredValidator(dom.Element inputElement, NgModel ngModel, Scope scope, NodeAttrs attrs):
+    super(inputElement, ngModel, scope) {
+      if(attrs['required'] != null) {
+        required = true;
+      }
+    }
 
-  NgModelRequiredValidator(NgModel ngModel) {
-    ngModel.addValidator(this);
+  bool isValid() {
+    return !required || (value != null && value.length > 0);
   }
 
-  bool isValid(value) {
-    // Any element which isn't required is always valid.
-    if (!_required) return true;
-    // Null is not a value, therefore not valid.
-    if (value == null) return false;
-    // Empty lists and/or strings are not valid.
-    // NOTE: This is an excellent use case for structural typing.
-    //   We really want anything object that has a 'isEmpty' property.
-    return !((value is List || value is String) && value.isEmpty);
-  }
-
+  @NgAttr('required')
+  get required => _required;
   set required(value) {
-    _required = value == null ? false : value;
+    if(value is String) return;
+    (_required = value) == true ? listen() : unlisten();
   }
 }
 
 /**
  * Validates the model to see if its contents match a valid URL pattern.
  */
 @NgDirective(selector: 'input[type=url][ng-model]')
-class NgModelUrlValidator implements NgValidatable {
+class NgModelUrlValidator extends _NgModelValidator {
   static final URL_REGEXP = new RegExp(
       r'^(ftp|http|https):\/\/(\w+:{0,1}\w*@)?(\S+)(:[0-9]+)?' +
       r'(\/|\/([\w#!:.?+=&%@!\-\/]))?$');
 
-  String get name => 'url';
+  get name => 'url';
 
-  NgModelUrlValidator(NgModel ngModel) {
-    ngModel.addValidator(this);
+  NgModelUrlValidator(dom.Element inputElement, NgModel ngModel, Scope scope):
+    super(inputElement, ngModel, scope) {
+      listen();
+    }
+
+  bool isValid() {
+    return value == null || value.length == 0 || URL_REGEXP.hasMatch(value);
   }
-
-  bool isValid(value) =>
-      value == null || value.isEmpty || URL_REGEXP.hasMatch(value);
 }
 
 /**
  * Validates the model to see if its contents match a valid email pattern.
  */
 @NgDirective(selector: 'input[type=email][ng-model]')
-class NgModelEmailValidator implements NgValidatable {
+class NgModelEmailValidator extends _NgModelValidator {
   static final EMAIL_REGEXP = new RegExp(
       r'^[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,6}$');
 
-  String get name => 'email';
+  get name => 'email';
 
-  NgModelEmailValidator(NgModel ngModel) {
-    ngModel.addValidator(this);
+  NgModelEmailValidator(dom.Element inputElement, NgModel ngModel, Scope scope):
+    super(inputElement, ngModel, scope) {
+      listen();
+    }
+
+  bool isValid() {
+    return value == null || value.length == 0 || EMAIL_REGEXP.hasMatch(value);
   }
-
-  bool isValid(value) =>
-      value == null || value.isEmpty || EMAIL_REGEXP.hasMatch(value);
 }
 
 /**
  * Validates the model to see if its contents match a valid number.
  */
 @NgDirective(selector: 'input[type=number][ng-model]')
-class NgModelNumberValidator implements NgValidatable {
-  String get name => 'number';
+class NgModelNumberValidator extends _NgModelValidator {
+  get name => 'number';
 
-  NgModelNumberValidator(NgModel ngModel) {
-    ngModel.addValidator(this);
-  }
+  NgModelNumberValidator(dom.Element inputElement, NgModel ngModel, Scope scope):
+    super(inputElement, ngModel, scope) {
+      listen();
+    }
 
-  bool isValid(value) {
-    if (value != null) {
+  bool isValid() {
+    if(value != null) {
       try {
         num val = double.parse(value.toString());
       } catch(exception, stackTrace) {
         return false;
       }
     }
     return true;
   }
 }
 
 /**
  * Validates the model to see if its contents match the given pattern present on either the
  * HTML pattern or ng-pattern attributes present on the input element.
  */
 @NgDirective(selector: '[ng-model][pattern]')
-@NgDirective(
-    selector: '[ng-model][ng-pattern]',
-    map: const {'ng-pattern': '=>pattern'})
-class NgModelPatternValidator implements NgValidatable {
+@NgDirective(selector: '[ng-model][ng-pattern]', map: const {'ng-pattern': '=>pattern'})
+class NgModelPatternValidator extends _NgModelValidator {
   RegExp _pattern;
 
-  String get name => 'pattern';
+  get name => 'pattern';
 
-  NgModelPatternValidator(NgModel ngModel) {
-    ngModel.addValidator(this);
-  }
+  NgModelPatternValidator(dom.Element inputElement, NgModel ngModel, Scope scope):
+    super(inputElement, ngModel, scope) {
+      listen();
+    }
 
-  bool isValid(value) {
+  bool isValid() {
+    if(_pattern != null && value != null && value.length > 0) {
+      return _pattern.hasMatch(ngModel.viewValue);
+    }
+
     //remember, only required validates for the input being empty
-    return _pattern == null || value == null || value.length == 0 ||
-           _pattern.hasMatch(value);
+    return true;
   }
 
   @NgAttr('pattern')
-  set pattern(val) =>
-      _pattern = val != null && val.length > 0 ? new RegExp(val) : null;
+  get pattern => _pattern;
+  set pattern(val) {
+    if(val != null && val.length > 0) {
+      _pattern = new RegExp(val);
+      listen();
+    } else {
+      _pattern = null;
+      unlisten();
+    }
+  }
 }
 
 /**
- * Validates the model to see if the length of its contents are greater than or
- * equal to the minimum length set in place by the HTML minlength or
- * ng-minlength attributes present on the input element.
+ * Validates the model to see if the length of its contents are greater than or equal to the minimum length
+ * set in place by the HTML minlength or ng-minlength attributes present on the input element.
  */
 @NgDirective(selector: '[ng-model][minlength]')
-@NgDirective(
-    selector: '[ng-model][ng-minlength]',
-    map: const {'ng-minlength': '=>minlength'})
-class NgModelMinLengthValidator implements NgValidatable {
+@NgDirective(selector: '[ng-model][ng-minlength]', map: const {'ng-minlength': '=>minlength'})
+class NgModelMinLengthValidator extends _NgModelValidator {
   int _minlength;
 
-  String get name => 'minlength';
+  get name => 'minlength';
 
-  NgModelMinLengthValidator(NgModel ngModel) {
-    ngModel.addValidator(this);
-  }
+  NgModelMinLengthValidator(dom.Element inputElement, NgModel ngModel, Scope scope):
+    super(inputElement, ngModel, scope) {
+      listen();
+    }
 
-  bool isValid(value) {
+  bool isValid() {
     //remember, only required validates for the input being empty
-    return _minlength == 0 || value == null || value.length == 0 ||
-           value.length >= _minlength;
+    if(_minlength == 0 || value == null || value.length == 0) {
+      return true;
+    }
+    return value.length >= _minlength;
   }
 
   @NgAttr('minlength')
-  set minlength(value) =>
-      _minlength = value == null ? 0 : int.parse(value.toString());
+  get minlength => _minlength;
+  set minlength(value) {
+    _minlength = value == null ? 0 : int.parse(value.toString());
+  }
 }
 
 /**
- * Validates the model to see if the length of its contents are less than or
- * equal to the maximum length set in place by the HTML maxlength or
- * ng-maxlength attributes present on the input element.
+ * Validates the model to see if the length of its contents are less than or equal to the maximum length
+ * set in place by the HTML maxlength or ng-maxlength attributes present on the input element.
  */
 @NgDirective(selector: '[ng-model][maxlength]')
-@NgDirective(
-    selector: '[ng-model][ng-maxlength]',
-    map: const {'ng-maxlength': '=>maxlength'})
-class NgModelMaxLengthValidator implements NgValidatable {
+@NgDirective(selector: '[ng-model][ng-maxlength]', map: const {'ng-maxlength': '=>maxlength'})
+class NgModelMaxLengthValidator extends _NgModelValidator {
   int _maxlength = 0;
 
-  String get name => 'maxlength';
+  get name => 'maxlength';
 
-  NgModelMaxLengthValidator(NgModel ngModel) {
-    ngModel.addValidator(this);
+  NgModelMaxLengthValidator(dom.Element inputElement, NgModel ngModel, Scope scope):
+    super(inputElement, ngModel, scope) {
+      listen();
+    }
+
+  bool isValid() {
+    return _maxlength == 0 || (value == null ? 0 : value.length) <= _maxlength;
   }
 
-  bool isValid(value) =>
-      _maxlength == 0 || (value == null ? 0 : value.length) <= _maxlength;
-
   @NgAttr('maxlength')
-  set maxlength(value) =>
-      _maxlength = value == null ? 0 : int.parse(value.toString());
+  get maxlength => _maxlength;
+  set maxlength(value) {
+    int length = value == null ? 0 : int.parse(value.toString());
+    if(length != maxlength) {
+      _maxlength = length;
+    }
+  }
 }