Read only a single DirectiveMetadata (will be squashed)

modules/angular2/src/transform/template_compiler/directive_metadata_reader.dart

@@ -6,10 +6,10 @@ import 'package:angular2/src/transform/common/logging.dart';
 import 'package:angular2/src/transform/common/parser.dart';
 
 /// Reads [DirectiveMetadata] from the `attributes` of `t`.
-List<DirectiveMetadata> readDirectiveMetadata(RegisteredType t) {
+DirectiveMetadata readDirectiveMetadata(RegisteredType t) {
   var visitor = new _DirectiveMetadataVisitor();
   t.annotations.accept(visitor);
-  return visitor.directiveMetadata;
+  return visitor.meta;
 }
 
 num _getDirectiveType(String annotationName) {
@@ -30,21 +30,23 @@ num _getDirectiveType(String annotationName) {
 /// [RegisterType] object and pulling out [DirectiveMetadata].
 class _DirectiveMetadataVisitor extends Object
     with RecursiveAstVisitor<Object> {
-  DirectiveMetadata current;
-  final List<DirectiveMetadata> directiveMetadata = [];
+  DirectiveMetadata meta;
 
   @override
   Object visitInstanceCreationExpression(InstanceCreationExpression node) {
     var directiveType = _getDirectiveType('${node.constructorName.type.name}');
     if (directiveType >= 0) {
-      current = new DirectiveMetadata(
+      if (meta != null) {
+        logger.error('Only one Directive is allowed per class. '
+            'Found "$node" but already processed "$meta".');
+      }
+      meta = new DirectiveMetadata(
           type: directiveType,
           compileChildren: false,
           properties: {},
           hostListeners: {},
           setters: [],
           readAttributes: []);
-      directiveMetadata.add(current);
       super.visitInstanceCreationExpression(node);
     }
     // Annotation we do not recognize - no need to visit.
@@ -91,7 +93,7 @@ class _DirectiveMetadataVisitor extends Object
   }
 
   void _populateSelector(Expression selectorValue) {
-    current.selector = _expressionToString(selectorValue, 'Directive#selector');
+    meta.selector = _expressionToString(selectorValue, 'Directive#selector');
   }
 
   void _populateCompileChildren(Expression compileChildrenValue) {
@@ -102,7 +104,7 @@ class _DirectiveMetadataVisitor extends Object
           ' Source: ${compileChildrenValue}');
       return;
     }
-    current.compileChildren = (compileChildrenValue as BooleanLiteral).value;
+    meta.compileChildren = (compileChildrenValue as BooleanLiteral).value;
   }
 
   void _populateProperties(Expression propertiesValue) {
@@ -115,7 +117,7 @@ class _DirectiveMetadataVisitor extends Object
     for (MapLiteralEntry entry in (propertiesValue as MapLiteral).entries) {
       var sKey = _expressionToString(entry.key, 'Directive#properties keys');
       var sVal = _expressionToString(entry.value, 'Direcive#properties values');
-      current.properties[sKey] = sVal;
+      meta.properties[sKey] = sVal;
     }
   }
 
@@ -130,7 +132,7 @@ class _DirectiveMetadataVisitor extends Object
       var sKey = _expressionToString(entry.key, 'Directive#hostListeners keys');
       var sVal =
           _expressionToString(entry.value, 'Directive#hostListeners values');
-      current.hostListeners[sKey] = sVal;
+      meta.hostListeners[sKey] = sVal;
     }
   }
 }

modules/angular2/test/transform/template_compiler/all_tests.dart

@@ -5,6 +5,7 @@ import 'package:barback/barback.dart';
 import 'package:angular2/src/dom/html_adapter.dart';
 import 'package:angular2/src/render/api.dart';
 import 'package:angular2/src/transform/common/asset_reader.dart';
+import 'package:angular2/src/transform/common/logging.dart';
 import 'package:angular2/src/transform/common/parser.dart';
 import 'package:angular2/src/transform/template_compiler/directive_metadata_reader.dart';
 import 'package:angular2/src/transform/template_compiler/generator.dart';
@@ -20,6 +21,8 @@ void allTests() {
   AssetReader reader = new TestAssetReader();
   var parser = new Parser(reader);
 
+  beforeEach(() => setLogger(new PrintLogger()));
+
   it('should parse simple expressions in inline templates.', () async {
     var inputPath =
         'template_compiler/inline_expression_files/hello.ng_deps.dart';
@@ -54,31 +57,29 @@ void allTests() {
   });
 
   describe('DirectiveMetadataReader', () {
-    Future<DirectiveMetadata> readSingleMetadata(inputPath) async {
+    Future<DirectiveMetadata> readMetadata(inputPath) async {
       var ngDeps = await parser.parse(new AssetId('a', inputPath));
-      var metadata = readDirectiveMetadata(ngDeps.registeredTypes.first);
-      expect(metadata.length).toEqual(1);
-      return metadata.first;
+      return readDirectiveMetadata(ngDeps.registeredTypes.first);
     }
 
     it('should parse selectors', () async {
-      var metadata = await readSingleMetadata(
+      var metadata = await readMetadata(
           'template_compiler/directive_metadata_files/selector.ng_deps.dart');
       expect(metadata.selector).toEqual('hello-app');
     });
 
     it('should parse compile children values', () async {
-      var metadata = await readSingleMetadata('template_compiler/'
+      var metadata = await readMetadata('template_compiler/'
           'directive_metadata_files/compile_children.ng_deps.dart');
       expect(metadata.compileChildren).toBeTrue();
 
-      metadata = await readSingleMetadata(
+      metadata = await readMetadata(
           'template_compiler/directive_metadata_files/selector.ng_deps.dart');
       expect(metadata.compileChildren).toBeFalse();
     });
 
     it('should parse properties.', () async {
-      var metadata = await readSingleMetadata('template_compiler/'
+      var metadata = await readMetadata('template_compiler/'
           'directive_metadata_files/properties.ng_deps.dart');
       expect(metadata.properties).toBeNotNull();
       expect(metadata.properties.length).toBe(2);
@@ -89,7 +90,7 @@ void allTests() {
     });
 
     it('should parse host listeners.', () async {
-      var metadata = await readSingleMetadata('template_compiler/'
+      var metadata = await readMetadata('template_compiler/'
           'directive_metadata_files/host_listeners.ng_deps.dart');
       expect(metadata.hostListeners).toBeNotNull();
       expect(metadata.hostListeners.length).toBe(2);
@@ -98,6 +99,14 @@ void allTests() {
       expect(metadata.hostListeners).toContain('keyDown');
       expect(metadata.hostListeners['keyDown']).toEqual('onKeyDown(\$event)');
     });
+
+    it('should fail when a class is annotated with multiple Directives.',
+        () async {
+      var ngDeps = await parser.parse(new AssetId('a', 'template_compiler/'
+          'directive_metadata_files/too_many_directives.ng_deps.dart'));
+      expect(() => readDirectiveMetadata(ngDeps.registeredTypes.first))
+          .toThrowWith(anInstanceOf: PrintLoggerError);
+    });
   });
 }
 

modules/angular2/test/transform/template_compiler/directive_metadata_files/too_many_directives.ng_deps.dart

@@ -0,0 +1,20 @@
+library examples.hello_world.index_common_dart.ng_deps.dart;
+
+import 'hello.dart';
+import 'package:angular2/angular2.dart'
+    show bootstrap, Component, Decorator, View, NgElement;
+
+bool _visited = false;
+void initReflector(reflector) {
+  if (_visited) return;
+  _visited = true;
+  reflector
+    ..registerType(HelloCmp, {
+      'factory': () => new HelloCmp(),
+      'parameters': const [const []],
+      'annotations': const [
+        const Component(selector: 'hello-app'),
+        const Component(selector: 'goodbye-app')
+      ]
+    });
+}