fix($compile): allow directives to have decorators

Allow directives to have decorators that modify the directive `scope` property

Close: #10149

Author: lgalfaso

src/ng/compile.js

@@ -851,13 +851,18 @@ function $CompileProvider($provide, $$sanitizeUriProvider) {
   // The assumption is that future DOM event attribute names will begin with
   // 'on' and be composed of only English letters.
   var EVENT_HANDLER_ATTR_REGEXP = /^(on[a-z]+|formaction)$/;
+  var bindingCache = createMap();
 
   function parseIsolateBindings(scope, directiveName, isController) {
     var LOCAL_REGEXP = /^\s*([@&<]|=(\*?))(\??)\s*(\w*)\s*$/;
 
     var bindings = {};
 
     forEach(scope, function(definition, scopeName) {
+      if (definition in bindingCache) {
+        bindings[scopeName] = bindingCache[definition];
+        return;
+      }
       var match = definition.match(LOCAL_REGEXP);
 
       if (!match) {
@@ -875,6 +880,9 @@ function $CompileProvider($provide, $$sanitizeUriProvider) {
         optional: match[3] === '?',
         attrName: match[4] || scopeName
       };
+      if (match[4]) {
+        bindingCache[definition] = bindings[scopeName];
+      }
     });
 
     return bindings;
@@ -967,11 +975,6 @@ function $CompileProvider($provide, $$sanitizeUriProvider) {
                 directive.name = directive.name || name;
                 directive.require = directive.require || (directive.controller && directive.name);
                 directive.restrict = directive.restrict || 'EA';
-                var bindings = directive.$$bindings =
-                    parseDirectiveBindings(directive, directive.name);
-                if (isObject(bindings.isolateScope)) {
-                  directive.$$isolateBindings = bindings.isolateScope;
-                }
                 directive.$$moduleName = directiveFactory.$$moduleName;
                 directives.push(directive);
               } catch (e) {
@@ -2532,6 +2535,13 @@ function $CompileProvider($provide, $$sanitizeUriProvider) {
               if (startAttrName) {
                 directive = inherit(directive, {$$start: startAttrName, $$end: endAttrName});
               }
+              if (!directive.$$bindings) {
+                var bindings = directive.$$bindings =
+                    parseDirectiveBindings(directive, directive.name);
+                if (isObject(bindings.isolateScope)) {
+                  directive.$$isolateBindings = bindings.isolateScope;
+                }
+              }
               tDirectives.push(directive);
               match = directive;
             }

test/ng/compileSpec.js

@@ -8144,6 +8144,51 @@ describe('$compile', function() {
       });
     });
 
+
+    it('should be possible to change the scope of a directive using $provide', function() {
+      module(function($provide) {
+        directive('foo', function() {
+          return {
+            scope: {},
+            template: '<div></div>'
+          };
+        });
+        $provide.decorator('fooDirective', function($delegate) {
+          var directive = $delegate[0];
+          directive.scope.something = '=';
+          directive.template = '<span>{{something}}</span>';
+          return $delegate;
+        });
+      });
+      inject(function($compile, $rootScope) {
+        element = $compile('<div><div foo something="bar"></div></div>')($rootScope);
+        $rootScope.bar = 'bar';
+        $rootScope.$digest();
+        expect(element.text()).toBe('bar');
+      });
+    });
+
+
+    it('should distinguish different bindings with the same binding name', function() {
+      module(function() {
+        directive('foo', function() {
+          return {
+            scope: {
+              foo: '=',
+              bar: '='
+            },
+            template: '<div><div>{{foo}}</div><div>{{bar}}</div></div>'
+          };
+        });
+      });
+      inject(function($compile, $rootScope) {
+        element = $compile('<div><div foo="\'foo\'" bar="\'bar\'"></div></div>')($rootScope);
+        $rootScope.$digest();
+        expect(element.text()).toBe('foobar');
+      });
+    });
+
+
     it('should safely create transclude comment node and not break with "-->"',
         inject(function($rootScope) {
       // see: https://github.com/angular/angular.js/issues/1740