feat($compile): simplify isolate scope bindings

Changed the isolate scope binding options to:
  - @attr - attribute binding (including interpolation)
  - =model - by-directional model binding
  - &expr - expression execution binding

This change simplifies the terminology as well as
number of choices available to the developer. It
also supports local name aliasing from the parent.

BREAKING CHANGE: isolate scope bindings definition has changed and
the inject option for the directive controller injection was removed.

To migrate the code follow the example below:

Before:

scope: {
  myAttr: 'attribute',
  myBind: 'bind',
  myExpression: 'expression',
  myEval: 'evaluate',
  myAccessor: 'accessor'
}

After:

scope: {
  myAttr: '@',
  myBind: '@',
  myExpression: '&',
  // myEval - usually not useful, but in cases where the expression is assignable, you can use '='
  myAccessor: '=' // in directive's template change myAccessor() to myAccessor
}

The removed `inject` wasn't generaly useful for directives so there should be no code using it.

1 files changed, 22 insertions, 7 deletions

diff --git a/test/ng/directive/inputSpec.js b/test/ng/directive/inputSpec.js
index d7ca7aea..3b511011 100644
--- a/test/ng/directive/inputSpec.js
+++ b/test/ng/directive/inputSpec.js
@@ -4,7 +4,7 @@ describe('NgModelController', function() {
   var ctrl, scope, ngModelAccessor, element, parentFormCtrl;
 
   beforeEach(inject(function($rootScope, $controller) {
-    var attrs = {name: 'testAlias'};
+    var attrs = {name: 'testAlias', ngModel: 'value'};
 
     parentFormCtrl = {
       $setValidity: jasmine.createSpy('$setValidity'),
@@ -17,12 +17,7 @@ describe('NgModelController', function() {
     scope = $rootScope;
     ngModelAccessor = jasmine.createSpy('ngModel accessor');
     ctrl = $controller(NgModelController, {
-      $scope: scope, $element: element.find('input'), ngModel: ngModelAccessor, $attrs: attrs
-    });
-    // mock accessor (locals)
-    ngModelAccessor.andCallFake(function(val) {
-      if (isDefined(val)) scope.value = val;
-      return scope.value;
+      $scope: scope, $element: element.find('input'), $attrs: attrs
     });
   }));
 
@@ -32,6 +27,26 @@ describe('NgModelController', function() {
   });
 
 
+  it('should fail on non-assignable model binding', inject(function($controller) {
+    var exception;
+
+    try {
+      $controller(NgModelController, {
+        $scope: null,
+        $element: jqLite('<input ng-model="1+2">'),
+        $attrs: {
+          ngModel: '1+2'
+        }
+      });
+    } catch (e) {
+      exception = e;
+    }
+
+    expect(exception.message).
+        toMatch(/Non-assignable model expression: 1\+2 \(<input( value="")? ng-model="1\+2">\)/);
+  }));
+
+
   it('should init the properties', function() {
     expect(ctrl.$dirty).toBe(false);
     expect(ctrl.$pristine).toBe(true);