feat(dart/transform): Reuse readDirectiveMetadata in plugin

Share code for parsing `DirectiveMetadata` values between the
transformer and the analyzer plugin.

modules/angular2/src/reflection/reflection_capabilities.dart

@@ -5,8 +5,7 @@ import 'types.dart';
 import 'dart:mirrors';
 
 class ReflectionCapabilities {
-  ReflectionCapabilities([metadataReader]) {
-  }
+  ReflectionCapabilities([metadataReader]) {}
 
   Function factory(Type type) {
     ClassMirror classMirror = reflectType(type);

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

@@ -1,30 +1,47 @@
 library angular2.transform.common.directive_metadata_reader;
 
 import 'package:analyzer/analyzer.dart';
+import 'package:analyzer/src/generated/element.dart';
 import 'package:angular2/src/render/api.dart';
-import 'logging.dart';
-import 'parser.dart';
 
-/// Reads [DirectiveMetadata] from the `attributes` of `t`.
-DirectiveMetadata readDirectiveMetadata(RegisteredType t) {
+/// Reads [DirectiveMetadata] from the `node`. `node` is expected to be an
+/// instance of [Annotation], [NodeList<Annotation>], ListLiteral, or
+/// [InstanceCreationExpression].
+DirectiveMetadata readDirectiveMetadata(dynamic node) {
+  assert(node is Annotation ||
+      node is NodeList ||
+      node is InstanceCreationExpression ||
+      node is ListLiteral);
   var visitor = new _DirectiveMetadataVisitor();
-  t.annotations.accept(visitor);
-  if (visitor.meta != null) {
-    visitor.meta.id = '${t.typeName}';
-  }
+  node.accept(visitor);
   return visitor.meta;
 }
 
-num _getDirectiveType(String annotationName) {
+num _getDirectiveType(String annotationName, Element element) {
+  var byNameMatch = -1;
   // TODO(kegluneq): Detect subtypes & implementations of `Directive`s.
   switch (annotationName) {
     case 'Directive':
-      return DirectiveMetadata.DIRECTIVE_TYPE;
+      byNameMatch = DirectiveMetadata.DIRECTIVE_TYPE;
+      break;
     case 'Component':
-      return DirectiveMetadata.COMPONENT_TYPE;
+      byNameMatch = DirectiveMetadata.COMPONENT_TYPE;
+      break;
     default:
       return -1;
   }
+  if (element != null) {
+    var byResolvedAst = -1;
+    var libName = element.library.name;
+    // If we have resolved, ensure the library is correct.
+    if (libName == 'angular2.src.core.annotations.annotations' ||
+        libName == 'angular2.src.core.annotations_impl.annotations') {
+      byResolvedAst = byNameMatch;
+    }
+    // TODO(kegluneq): @keertip, can we expose this as a warning?
+    assert(byNameMatch == byResolvedAst);
+  }
+  return byNameMatch;
 }
 
 /// Visitor responsible for processing the `annotations` property of a
@@ -33,22 +50,45 @@ class _DirectiveMetadataVisitor extends Object
     with RecursiveAstVisitor<Object> {
   DirectiveMetadata meta;
 
+  void _createEmptyMetadata(num type) {
+    assert(type >= 0);
+    meta = new DirectiveMetadata(
+        type: type,
+        compileChildren: true,
+        properties: {},
+        hostListeners: {},
+        hostProperties: {},
+        hostAttributes: {},
+        readAttributes: []);
+  }
+
   @override
-  Object visitInstanceCreationExpression(InstanceCreationExpression node) {
-    var directiveType = _getDirectiveType('${node.constructorName.type.name}');
+  Object visitAnnotation(Annotation node) {
+    var directiveType = _getDirectiveType('${node.name}', node.element);
     if (directiveType >= 0) {
       if (meta != null) {
-        logger.error('Only one Directive is allowed per class. '
-            'Found "$node" but already processed "$meta".');
+        throw new FormatException('Only one Directive is allowed per class. '
+            'Found "$node" but already processed "$meta".',
+            '$node' /* source */);
       }
-      meta = new DirectiveMetadata(
-          type: directiveType,
-          compileChildren: true,
-          properties: {},
-          hostListeners: {},
-          hostProperties: {},
-          hostAttributes: {},
-          readAttributes: []);
+      _createEmptyMetadata(directiveType);
+      super.visitAnnotation(node);
+    }
+    // Annotation we do not recognize - no need to visit.
+    return null;
+  }
+
+  @override
+  Object visitInstanceCreationExpression(InstanceCreationExpression node) {
+    var directiveType = _getDirectiveType(
+        '${node.constructorName.type.name}', node.staticElement);
+    if (directiveType >= 0) {
+      if (meta != null) {
+        throw new FormatException('Only one Directive is allowed per class. '
+            'Found "$node" but already processed "$meta".',
+            '$node' /* source */);
+      }
+      _createEmptyMetadata(directiveType);
       super.visitInstanceCreationExpression(node);
     }
     // Annotation we do not recognize - no need to visit.
@@ -59,10 +99,9 @@ class _DirectiveMetadataVisitor extends Object
   Object visitNamedExpression(NamedExpression node) {
     // TODO(kegluneq): Remove this limitation.
     if (node.name is! Label || node.name.label is! SimpleIdentifier) {
-      logger.error(
-          'Angular 2 currently only supports simple identifiers in directives.'
-          ' Source: ${node}');
-      return null;
+      throw new FormatException(
+          'Angular 2 currently only supports simple identifiers in directives.',
+          '$node' /* source */);
     }
     var keyString = '${node.name.label}';
     // TODO(kegluneq): Populate the other values in [DirectiveMetadata] once
@@ -93,9 +132,9 @@ class _DirectiveMetadataVisitor extends Object
   String _expressionToString(Expression node, String nodeDescription) {
     // TODO(kegluneq): Accept more options.
     if (node is! SimpleStringLiteral) {
-      logger.error('Angular 2 currently only supports string literals '
-          'in $nodeDescription. Source: ${node}');
-      return null;
+      throw new FormatException(
+          'Angular 2 currently only supports string literals '
+          'in $nodeDescription.', '$node' /* source */);
     }
     return stringLiteralToString(node);
   }
@@ -104,23 +143,30 @@ class _DirectiveMetadataVisitor extends Object
     meta.selector = _expressionToString(selectorValue, 'Directive#selector');
   }
 
+  void _checkMeta() {
+    if (meta == null) {
+      throw new ArgumentError(
+          'Incorrect value passed to readDirectiveMetadata. '
+          'Expected types are Annotation and InstanceCreationExpression');
+    }
+  }
+
   void _populateCompileChildren(Expression compileChildrenValue) {
+    _checkMeta();
     if (compileChildrenValue is! BooleanLiteral) {
-      logger.error(
+      throw new FormatException(
           'Angular 2 currently only supports boolean literal values for '
-          'Directive#compileChildren.'
-          ' Source: ${compileChildrenValue}');
-      return;
+          'Directive#compileChildren.', '$compileChildrenValue' /* source */);
     }
     meta.compileChildren = (compileChildrenValue as BooleanLiteral).value;
   }
 
   void _populateProperties(Expression propertiesValue) {
+    _checkMeta();
     if (propertiesValue is! MapLiteral) {
-      logger.error('Angular 2 currently only supports map literal values for '
-          'Directive#properties.'
-          ' Source: ${propertiesValue}');
-      return;
+      throw new FormatException(
+          'Angular 2 currently only supports map literal values for '
+          'Directive#properties.', '$propertiesValue' /* source */);
     }
     for (MapLiteralEntry entry in (propertiesValue as MapLiteral).entries) {
       var sKey = _expressionToString(entry.key, 'Directive#properties keys');
@@ -130,11 +176,11 @@ class _DirectiveMetadataVisitor extends Object
   }
 
   void _populateHostListeners(Expression hostListenersValue) {
+    _checkMeta();
     if (hostListenersValue is! MapLiteral) {
-      logger.error('Angular 2 currently only supports map literal values for '
-          'Directive#hostListeners.'
-          ' Source: ${hostListenersValue}');
-      return;
+      throw new FormatException(
+          'Angular 2 currently only supports map literal values for '
+          'Directive#hostListeners.', '$hostListenersValue' /* source */);
     }
     for (MapLiteralEntry entry in (hostListenersValue as MapLiteral).entries) {
       var sKey = _expressionToString(entry.key, 'Directive#hostListeners keys');
@@ -145,11 +191,11 @@ class _DirectiveMetadataVisitor extends Object
   }
 
   void _populateHostProperties(Expression hostPropertyValue) {
+    _checkMeta();
     if (hostPropertyValue is! MapLiteral) {
-      logger.error('Angular 2 currently only supports map literal values for '
-          'Directive#hostProperties.'
-          ' Source: ${hostPropertyValue}');
-      return;
+      throw new FormatException(
+          'Angular 2 currently only supports map literal values for '
+          'Directive#hostProperties.', '$hostPropertyValue' /* source */);
     }
     for (MapLiteralEntry entry in (hostPropertyValue as MapLiteral).entries) {
       var sKey =
@@ -161,11 +207,11 @@ class _DirectiveMetadataVisitor extends Object
   }
 
   void _populateHostAttributes(Expression hostAttributeValue) {
+    _checkMeta();
     if (hostAttributeValue is! MapLiteral) {
-      logger.error('Angular 2 currently only supports map literal values for '
-          'Directive#hostAttributes.'
-          ' Source: ${hostAttributeValue}');
-      return;
+      throw new FormatException(
+          'Angular 2 currently only supports map literal values for '
+          'Directive#hostAttributes.', '$hostAttributeValue' /* source */);
     }
     for (MapLiteralEntry entry in (hostAttributeValue as MapLiteral).entries) {
       var sKey =

modules/angular2/src/transform/common/registered_type.dart

@@ -1,6 +1,9 @@
 library angular2.transform.common.registered_type;
 
 import 'package:analyzer/analyzer.dart';
+import 'package:angular2/src/render/api.dart';
+import 'package:angular2/src/transform/common/directive_metadata_reader.dart';
+import 'package:angular2/src/transform/common/logging.dart';
 import 'package:angular2/src/transform/common/names.dart';
 
 /// A call to `Reflector#registerType` generated by `DirectiveProcessor`.
@@ -16,6 +19,8 @@ class RegisteredType {
   /// The annotations registered.
   final Expression annotations;
 
+  DirectiveMetadata _directiveMetadata = null;
+
   RegisteredType._(this.typeName, this.registerMethod, this.factoryFn,
       this.parameters, this.annotations);
 
@@ -27,6 +32,20 @@ class RegisteredType {
     return new RegisteredType._(visitor.typeName, registerMethod,
         visitor.factoryFn, visitor.parameters, visitor.annotations);
   }
+
+  DirectiveMetadata get directiveMetadata {
+    if (_directiveMetadata == null) {
+      try {
+        _directiveMetadata = readDirectiveMetadata(annotations);
+        if (_directiveMetadata != null) {
+          _directiveMetadata.id = '$typeName';
+        }
+      } on FormatException catch (ex) {
+        logger.error(ex.message);
+      }
+    }
+    return _directiveMetadata;
+  }
 }
 
 class _ParseRegisterTypeVisitor extends Object

modules/angular2/src/transform/directive_metadata_extractor/extractor.dart

@@ -5,7 +5,6 @@ import 'dart:async';
 import 'package:analyzer/analyzer.dart';
 import 'package:angular2/src/render/api.dart';
 import 'package:angular2/src/transform/common/asset_reader.dart';
-import 'package:angular2/src/transform/common/directive_metadata_reader.dart';
 import 'package:angular2/src/transform/common/logging.dart';
 import 'package:angular2/src/transform/common/names.dart';
 import 'package:angular2/src/transform/common/parser.dart';
@@ -58,9 +57,8 @@ Map<String, DirectiveMetadata> _metadataMapFromNgDeps(NgDeps ngDeps) {
   if (ngDeps == null || ngDeps.registeredTypes.isEmpty) return null;
   var retVal = <String, DirectiveMetadata>{};
   ngDeps.registeredTypes.forEach((rType) {
-    var meta = readDirectiveMetadata(rType);
-    if (meta != null) {
-      retVal['${rType.typeName}'] = meta;
+    if (rType.directiveMetadata != null) {
+      retVal['${rType.typeName}'] = rType.directiveMetadata;
     }
   });
   return retVal;

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

@@ -24,7 +24,7 @@ void allTests() {
 
   Future<DirectiveMetadata> readMetadata(inputPath) async {
     var ngDeps = await parser.parse(new AssetId('a', inputPath));
-    return readDirectiveMetadata(ngDeps.registeredTypes.first);
+    return ngDeps.registeredTypes.first.directiveMetadata;
   }
 
   describe('readMetadata', () {
@@ -44,17 +44,17 @@ void allTests() {
       // Unset value defaults to `true`.
       it.moveNext();
       expect('${it.current.typeName}').toEqual('UnsetComp');
-      var unsetComp = readDirectiveMetadata(it.current);
+      var unsetComp = it.current.directiveMetadata;
       expect(unsetComp.compileChildren).toBeTrue();
 
       it.moveNext();
       expect('${it.current.typeName}').toEqual('FalseComp');
-      var falseComp = readDirectiveMetadata(it.current);
+      var falseComp = it.current.directiveMetadata;
       expect(falseComp.compileChildren).toBeFalse();
 
       it.moveNext();
       expect('${it.current.typeName}').toEqual('TrueComp');
-      var trueComp = readDirectiveMetadata(it.current);
+      var trueComp = it.current.directiveMetadata;
       expect(trueComp.compileChildren).toBeTrue();
     });
 
@@ -85,8 +85,8 @@ void allTests() {
       var ngDeps = await parser.parse(new AssetId('a',
           'directive_metadata_extractor/'
           'directive_metadata_files/too_many_directives.ng_deps.dart'));
-      expect(() => readDirectiveMetadata(ngDeps.registeredTypes.first))
-          .toThrowWith(anInstanceOf: PrintLoggerError);
+      expect(() => ngDeps.registeredTypes.first.directiveMetadata).toThrowWith(
+          anInstanceOf: PrintLoggerError);
     });
   });
 

modules_dart/analyzer_plugin/lib/src/tasks.dart

@@ -1,13 +1,12 @@
 library angular2.src.analysis.analyzer_plugin.src.tasks;
 
 import 'package:analyzer/src/generated/ast.dart' hide Directive;
-import 'package:analyzer/src/generated/element.dart';
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/task/general.dart';
 import 'package:analyzer/task/dart.dart';
 import 'package:analyzer/task/model.dart';
-import 'package:angular2/src/core/annotations/annotations.dart';
 import 'package:angular2/src/render/api.dart';
+import 'package:angular2/src/transform/common/directive_metadata_reader.dart';
 
 /// The [DirectiveMetadata]s of a [LibrarySpecificUnit].
 final ListResultDescriptor<DirectiveMetadata> DIRECTIVES =
@@ -33,74 +32,15 @@ class BuildUnitDirectivesTask extends SourceBasedAnalysisTask {
     List<DirectiveMetadata> metaList = <DirectiveMetadata>[];
     for (CompilationUnitMember unitMember in unit.declarations) {
       if (unitMember is ClassDeclaration) {
-        for (Annotation annotationNode in unitMember.metadata) {
-          Directive directive = _createDirective(annotationNode);
-          if (directive != null) {
-            DirectiveMetadata meta = new DirectiveMetadata(
-                type: _getDirectiveType(directive),
-                selector: directive.selector);
-            metaList.add(meta);
-          }
+        DirectiveMetadata meta = readDirectiveMetadata(unitMember.metadata);
+        if (meta != null) {
+          metaList.add(meta);
         }
       }
     }
     outputs[DIRECTIVES] = metaList;
   }
 
-  /// Returns an Angular [Directive] that corresponds to the given [node].
-  /// Returns `null` if not an Angular annotation.
-  Directive _createDirective(Annotation node) {
-    // TODO(scheglov) add support for all arguments
-    if (_isAngularAnnotation(node, 'Component')) {
-      String selector = _getNamedArgument(node, 'selector');
-      return new Component(selector: selector);
-    }
-    if (_isAngularAnnotation(node, 'Directive')) {
-      String selector = _getNamedArgument(node, 'selector');
-      return new Directive(selector: selector);
-    }
-    return null;
-  }
-
-  int _getDirectiveType(Directive directive) {
-    if (directive is Component) {
-      return DirectiveMetadata.COMPONENT_TYPE;
-    }
-    return DirectiveMetadata.DIRECTIVE_TYPE;
-  }
-
-  /// Returns the value of an argument with the given [name].
-  /// Returns `null` if not found or cannot be evaluated statically.
-  Object _getNamedArgument(Annotation node, String name) {
-    if (node.arguments != null) {
-      List<Expression> arguments = node.arguments.arguments;
-      for (Expression argument in arguments) {
-        if (argument is NamedExpression &&
-            argument.name != null &&
-            argument.name.label != null &&
-            argument.name.label.name == name) {
-          Expression expression = argument.expression;
-          if (expression is SimpleStringLiteral) {
-            return expression.value;
-          }
-        }
-      }
-    }
-    return null;
-  }
-
-  /// Returns `true` is the given [node] is resolved to a creation of an Angular
-  /// annotation class with the given [name].
-  bool _isAngularAnnotation(Annotation node, String name) {
-    if (node.element is ConstructorElement) {
-      ClassElement clazz = node.element.enclosingElement;
-      return clazz.library.name ==
-              'angular2.src.core.annotations.annotations' &&
-          clazz.name == name;
-    }
-    return null;
-  }
-
   static Map<String, TaskInput> buildInputs(LibrarySpecificUnit target) {
     return <String, TaskInput>{UNIT_INPUT: RESOLVED_UNIT.of(target)};
   }