feat(injector): initial implementaion of dynamic injector

modules/core/src/compiler/compiler.js

@@ -1,4 +1,5 @@
-import {Future, Type} from 'facade/lang';
+import {Type} from 'facade/lang';
+import {Future} from 'facade/async';
 import {Element} from 'facade/dom';
 //import {ProtoView} from './view';
 import {TemplateLoader} from './template_loader';

modules/core/src/compiler/template_loader.js

@@ -1,4 +1,4 @@
-import {Future} from 'facade/lang';
+import {Future} from 'facade/async';
 //import {Document} from 'facade/dom';
 
 export class TemplateLoader {

modules/di/src/annotations.js

@@ -0,0 +1,7 @@
+//TODO: vsavkin: uncomment once const constructor are supported
+//export class Inject {
+//  @CONST
+//  constructor(token){
+//    this.token = token;
+//  }
+//}

modules/di/src/binding.js

@@ -0,0 +1,64 @@
+import {Type} from 'facade/lang';
+import {List, MapWrapper, ListWrapper} from 'facade/collection';
+import {Reflector} from 'facade/di/reflector';
+import {Key} from './key';
+
+export class Binding {
+  constructor(key:Key, factory:Function, dependencies:List, async) {
+    this.key = key;
+    this.factory = factory;
+    this.dependencies = dependencies;
+    this.async = async;
+  }
+}
+
+export function bind(token):BindingBuilder {
+  return new BindingBuilder(token);
+}
+
+export class BindingBuilder {
+  constructor(token) {
+    this.token = token;
+    this.reflector = new Reflector();
+  }
+
+  toClass(type:Type):Binding {
+    return new Binding(
+      Key.get(this.token),
+      this.reflector.factoryFor(type),
+      this._wrapKeys(this.reflector.dependencies(type)),
+      false
+    );
+  }
+
+  toValue(value):Binding {
+    return new Binding(
+      Key.get(this.token),
+      (_) => value,
+      [],
+      false
+    );
+  }
+
+  toFactory(dependencies:List, factoryFunction:Function):Binding {
+    return new Binding(
+      Key.get(this.token),
+      this.reflector.convertToFactory(factoryFunction),
+      this._wrapKeys(dependencies),
+      false
+    );
+  }
+
+  toAsyncFactory(dependencies:List, factoryFunction:Function):Binding {
+    return new Binding(
+      Key.get(this.token),
+      this.reflector.convertToFactory(factoryFunction),
+      this._wrapKeys(dependencies),
+      true
+    );
+  }
+
+  _wrapKeys(deps:List) {
+    return ListWrapper.map(deps, (t) => Key.get(t));
+  }
+}

modules/di/src/di.js

@@ -1 +1,5 @@
+export * from './injector';
+export * from './binding';
+export * from './key';
 export * from './module';
+export {Inject} from 'facade/di/reflector';

modules/di/src/exceptions.js

@@ -0,0 +1,52 @@
+import {ListWrapper, List} from 'facade/collection';
+import {humanize} from 'facade/lang';
+
+function constructResolvingPath(keys: List) {
+  if (keys.length > 1) {
+    var tokenStrs = ListWrapper.map(keys, (k) => humanize(k.token));
+    return " (" + tokenStrs.join(' -> ') + ")";
+  } else {
+    return "";
+  }
+}
+
+export class NoProviderError extends Error {
+  constructor(keys:List){
+    this.message = this._constructResolvingMessage(keys);
+  }
+
+  _constructResolvingMessage(keys:List) {
+    var last = humanize(ListWrapper.last(keys).token);
+    return `No provider for ${last}!${constructResolvingPath(keys)}`;
+  }
+
+  toString() {
+    return this.message;
+  }
+}
+
+export class AsyncProviderError extends Error {
+  constructor(keys:List){
+    this.message = this._constructResolvingMessage(keys);
+  }
+
+  _constructResolvingMessage(keys:List) {
+    var last = humanize(ListWrapper.last(keys).token);
+    return `Cannot instantiate ${last} synchronously. ` +
+      `It is provided as a future!${constructResolvingPath(keys)}`;
+  }
+
+  toString() {
+    return this.message;
+  }
+}
+
+export class InvalidBindingError extends Error {
+  constructor(binding){
+    this.message = `Invalid binding ${binding}`;
+  }
+
+  toString() {
+    return this.message;
+  }
+}

modules/di/src/injector.js

@@ -0,0 +1,133 @@
+import {Map, List, MapWrapper, ListWrapper} from 'facade/collection';
+import {Binding, BindingBuilder, bind} from './binding';
+import {NoProviderError, InvalidBindingError, AsyncProviderError} from './exceptions';
+import {Type, isPresent, isBlank} from 'facade/lang';
+import {Future, FutureWrapper} from 'facade/async';
+import {Key} from './key';
+
+export class Injector {
+  constructor(bindings:List) {
+    var flatten = _flattenBindings(bindings);
+    this._bindings = this._createListOfBindings(flatten);
+    this._instances = this._createInstances();
+    this._parent = null; //TODO: vsavkin make a parameter
+  }
+
+  _createListOfBindings(flattenBindings):List {
+    var bindings = ListWrapper.createFixedSize(Key.numberOfKeys() + 1);
+    MapWrapper.forEach(flattenBindings, (keyId, v) => bindings[keyId] = v);
+    return bindings;
+  }
+
+  _createInstances():List {
+    return ListWrapper.createFixedSize(Key.numberOfKeys() + 1);
+  }
+
+  get(token) {
+    return this.getByKey(Key.get(token));
+  }
+
+  asyncGet(token) {
+    return this.asyncGetByKey(Key.get(token));
+  }
+
+  getByKey(key:Key) {
+    return this._getByKey(key, [], false);
+  }
+
+  asyncGetByKey(key:Key) {
+    return this._getByKey(key, [], true);
+  }
+
+  _getByKey(key:Key, resolving:List, async) {
+    var keyId = key.id;
+    //TODO: vsavkin: use LinkedList to remove clone
+    resolving = ListWrapper.clone(resolving)
+    ListWrapper.push(resolving, key);
+
+    if (key.token === Injector) return this._injector(async);
+
+    var instance = this._get(this._instances, keyId);
+    if (isPresent(instance)) return instance;
+
+    var binding = this._get(this._bindings, keyId);
+
+    if (isPresent(binding)) {
+      return this._instantiate(key, binding, resolving, async);
+    }
+
+    if (isPresent(this._parent)) {
+      return this._parent._getByKey(key, resolving, async);
+    }
+
+    throw new NoProviderError(resolving);
+  }
+
+  createChild(bindings:List):Injector {
+    var inj = new Injector(bindings);
+    inj._parent = this; //TODO: vsavkin: change it when optional parameters are working
+    return inj;
+  }
+
+  _injector(async){
+    return async ? FutureWrapper.value(this) : this;
+  }
+
+  _get(list:List, index){
+    if (list.length <= index) return null;
+    return ListWrapper.get(list, index);
+  }
+
+  _instantiate(key:Key, binding:Binding, resolving:List, async) {
+    if (binding.async && !async) {
+      throw new AsyncProviderError(resolving);
+    }
+
+    if (async) {
+      return this._instantiateAsync(key, binding, resolving, async);
+    } else {
+      return this._instantiateSync(key, binding, resolving, async);
+    }
+  }
+
+  _instantiateSync(key:Key, binding:Binding, resolving:List, async) {
+    var deps = ListWrapper.map(binding.dependencies, d => this._getByKey(d, resolving, false));
+    var instance = binding.factory(deps);
+    ListWrapper.set(this._instances, key.id, instance);
+    if (!binding.async && async) {
+      return FutureWrapper.value(instance);
+    }
+    return instance;
+  }
+
+  _instantiateAsync(key:Key, binding:Binding, resolving:List, async):Future {
+    var instances = this._createInstances();
+    var futures = ListWrapper.map(binding.dependencies, d => this._getByKey(d, resolving, true));
+    return FutureWrapper.wait(futures).
+      then(binding.factory).
+      then(function(instance) {
+        ListWrapper.set(instances, key.id, instance);
+        return instance
+      });
+  }
+}
+
+function _flattenBindings(bindings:List) {
+  var res = {};
+  ListWrapper.forEach(bindings, function (b){
+    if (b instanceof Binding) {
+      MapWrapper.set(res, b.key.id, b);
+
+    } else if (b instanceof Type) {
+      var s = bind(b).toClass(b);
+      MapWrapper.set(res, s.key.id, s);
+
+    } else if (b instanceof BindingBuilder) {
+      throw new InvalidBindingError(b.token);
+
+    } else {
+      throw new InvalidBindingError(b);
+    }
+  });
+  return res;
+}

modules/di/src/key.js

@@ -1,3 +1,25 @@
-export class Key {
+import {MapWrapper} from 'facade/collection';
 
+var _allKeys = {};
+var _id = 0;
+
+export class Key {
+  constructor(token, id) {
+    this.token = token;
+    this.id = id;
+  }
+
+  static get(token) {
+    if (MapWrapper.contains(_allKeys, token)) {
+      return MapWrapper.get(_allKeys, token)
+    }
+
+    var newKey = new Key(token, ++_id);
+    MapWrapper.set(_allKeys, token, newKey);
+    return newKey;
+  }
+
+  static numberOfKeys() {
+    return _id;
+  }
 }

modules/di/src/module.js

@@ -1,26 +1 @@
-import {FIELD} from 'facade/lang';
-import {Type} from 'facade/lang';
-import {Map, MapWrapper} from 'facade/collection';
-import {Key} from './key';
-
-/// becouse we need to know when toValue was not set.
-/// (it could be that toValue is set to null or undefined in js)
-var _UNDEFINED = {}
-
-export class Module {
-
-  @FIELD('final bindings:Map<Key, Binding>')
-  constructor(){
-    this.bindings = new MapWrapper();
-  }
-
-  bind(type:Type,
-      {toValue/*=_UNDEFINED*/, toFactory, toImplementation, inject, toInstanceOf, withAnnotation}/*:
-        {toFactory:Function, toImplementation: Type, inject: Array, toInstanceOf:Type}*/) {}
-
-  bindByKey(key:Key,
-      {toValue/*=_UNDEFINED*/, toFactory, toImplementation, inject, toInstanceOf}/*:
-        {toFactory:Function, toImplementation: Type, inject: Array, toInstanceOf:Type}*/) {}
-
-  install(module:Module) {}
-}
+export class Module {}

modules/di/test/di/async_spec.js

@@ -0,0 +1,76 @@
+import {ddescribe, describe, it, iit, xit, expect, beforeEach} from 'test_lib/test_lib';
+import {Injector, Inject, bind, Key} from 'di/di';
+import {Future, FutureWrapper} from 'facade/async';
+
+class UserList {}
+
+function fetchUsers() {
+  return FutureWrapper.value(new UserList());
+}
+
+class SynchronousUserList {}
+
+
+class UserController {
+  constructor(list:UserList) {
+    this.list = list;
+  }
+}
+
+export function main () {
+  describe("async injection", function () {
+    it('should return a future', function() {
+      var injector = new Injector([
+        bind(UserList).toAsyncFactory([], fetchUsers)
+      ]);
+      var p = injector.asyncGet(UserList);
+      expect(p).toBeFuture();
+    });
+
+    it('should throw when instantiating async provider synchronously', function() {
+      var injector = new Injector([
+        bind(UserList).toAsyncFactory([], fetchUsers)
+      ]);
+
+      expect(() => injector.get(UserList))
+        .toThrowError('Cannot instantiate UserList synchronously. It is provided as a future!');
+    });
+
+    it('should return a future even if the provider is sync', function() {
+      var injector = new Injector([
+        SynchronousUserList
+      ]);
+      var p = injector.asyncGet(SynchronousUserList);
+      expect(p).toBeFuture();
+    });
+
+    it('should provide itself', function() {
+      var injector = new Injector([]);
+      var p = injector.asyncGet(Injector);
+      expect(p).toBeFuture();
+    });
+
+    it('should return a future when a dependency is async', function(done) {
+      var injector = new Injector([
+        bind(UserList).toAsyncFactory([], fetchUsers),
+        UserController
+      ]);
+
+      injector.asyncGet(UserController).then(function(userController) {
+        expect(userController).toBeAnInstanceOf(UserController);
+        expect(userController.list).toBeAnInstanceOf(UserList);
+        done();
+      });
+    });
+
+    it('should throw when a dependency is async', function() {
+      var injector = new Injector([
+        bind(UserList).toAsyncFactory([], fetchUsers),
+        UserController
+      ]);
+
+      expect(() => injector.get(UserController))
+        .toThrowError('Cannot instantiate UserList synchronously. It is provided as a future! (UserController -> UserList)');
+    });
+  });
+}

modules/di/test/di/injector_spec.js

@@ -0,0 +1,144 @@
+import {describe, it, expect, beforeEach} from 'test_lib/test_lib';
+import {Injector, Inject, bind} from 'di/di';
+
+class Engine {}
+class Dashboard {}
+class TurboEngine extends Engine{}
+
+class Car {
+  constructor(engine:Engine) {
+    this.engine = engine;
+  }
+}
+
+class CarWithDashboard {
+  constructor(engine:Engine, dashboard:Dashboard) {
+    this.engine = engine;
+    this.dashboard = dashboard;
+  }
+}
+
+class SportsCar extends Car {
+  constructor(engine:Engine) {
+    super(engine);
+  }
+}
+
+class CarWithInject {
+  constructor(@Inject(TurboEngine) engine:Engine) {
+    this.engine = engine;
+  }
+}
+
+export function main() {
+  describe('injector', function() {
+    it('should instantiate a class without dependencies', function() {
+      var injector = new Injector([Engine]);
+      var engine = injector.get(Engine);
+
+      expect(engine).toBeAnInstanceOf(Engine);
+    });
+
+    it('should resolve dependencies based on type information', function() {
+      var injector = new Injector([Engine, Car]);
+      var car = injector.get(Car);
+
+      expect(car).toBeAnInstanceOf(Car);
+      expect(car.engine).toBeAnInstanceOf(Engine);
+    });
+
+    it('should resolve dependencies based on @Inject annotation', function() {
+      var injector = new Injector([TurboEngine, Engine, CarWithInject]);
+      var car = injector.get(CarWithInject);
+
+      expect(car).toBeAnInstanceOf(CarWithInject);
+      expect(car.engine).toBeAnInstanceOf(TurboEngine);
+    });
+
+    it('should cache instances', function() {
+      var injector = new Injector([Engine]);
+
+      var e1 = injector.get(Engine);
+      var e2 = injector.get(Engine);
+
+      expect(e1).toBe(e2);
+    });
+
+    it('should bind to a value', function() {
+      var injector = new Injector([
+        bind(Engine).toValue("fake engine")
+      ]);
+
+      var engine = injector.get(Engine);
+      expect(engine).toEqual("fake engine");
+    });
+
+    it('should bind to a factory', function() {
+      var injector = new Injector([
+        Engine,
+        bind(Car).toFactory([Engine], (e) => new SportsCar(e))
+      ]);
+
+      var car = injector.get(Car);
+      expect(car).toBeAnInstanceOf(SportsCar);
+      expect(car.engine).toBeAnInstanceOf(Engine);
+    });
+
+    it('should use non-type tokens', function() {
+      var injector = new Injector([
+        bind('token').toValue('value')
+      ]);
+
+      expect(injector.get('token')).toEqual('value');
+    });
+
+    it('should throw when given invalid bindings', function() {
+      expect(() => new Injector(["blah"])).toThrowError('Invalid binding blah');
+      expect(() => new Injector([bind("blah")])).toThrowError('Invalid binding blah');
+    });
+
+    describe("child", function () {
+      it('should load instances from parent injector', function() {
+        var parent = new Injector([Engine]);
+        var child = parent.createChild([]);
+
+        var engineFromParent = parent.get(Engine);
+        var engineFromChild = child.get(Engine);
+
+        expect(engineFromChild).toBe(engineFromParent);
+      });
+
+      it('should create new instance in a child injector', function() {
+        var parent = new Injector([Engine]);
+        var child = parent.createChild([
+          bind(Engine).toClass(TurboEngine)
+        ]);
+
+        var engineFromParent = parent.get(Engine);
+        var engineFromChild = child.get(Engine);
+
+        expect(engineFromParent).not.toBe(engineFromChild);
+        expect(engineFromChild).toBeAnInstanceOf(TurboEngine);
+      });
+    });
+
+    it('should provide itself', function() {
+      var parent = new Injector([]);
+      var child = parent.createChild([]);
+
+      expect(child.get(Injector)).toBe(child);
+    });
+
+    it('should throw when no provider defined', function() {
+      var injector = new Injector([]);
+      expect(() => injector.get('NonExisting')).toThrowError('No provider for NonExisting!');
+    });
+
+    it('should show the full path when no provider', function() {
+      var injector = new Injector([CarWithDashboard, Engine]);
+
+      expect(() => injector.get(CarWithDashboard)).
+        toThrowError('No provider for Dashboard! (CarWithDashboard -> Dashboard)');
+    });
+  });
+}

modules/di/test/di/key_spec.js

@@ -0,0 +1,14 @@
+import {describe, it, expect} from 'test_lib/test_lib';
+import {Key} from 'di/di';
+
+export function main () {
+  describe("key", function () {
+    it('should be equal to another key if type is the same', function () {
+      expect(Key.get('car')).toBe(Key.get('car'));
+    });
+
+    it('should not be equal to another key if types are different', function () {
+      expect(Key.get('car')).not.toBe(Key.get('porsche'));
+    });
+  });
+}

modules/facade/src/async.dart

@@ -0,0 +1,14 @@
+library angular.core.facade.async;
+
+import 'dart:async';
+export 'dart:async' show Future;
+
+class FutureWrapper {
+  static Future value(obj) {
+    return new Future.value(obj);
+  }
+
+  static Future wait(List<Future> futures){
+    return Future.wait(futures);
+  }
+}

modules/facade/src/async.es6

@@ -0,0 +1,12 @@
+export var Future = Promise;
+
+export class FutureWrapper {
+  static value(obj):Future {
+    return Future.resolve(obj);
+  }
+
+  static wait(futures):Future {
+    if (futures.length == 0) return Future.resolve([]);
+    return Future.all(futures);
+  }
+}

modules/facade/src/collection.dart

@@ -8,14 +8,25 @@ class MapWrapper {
   static get(m, k) => m[k];
   static void set(m, k, v){ m[k] = v; }
   static contains(m, k) => m.containsKey(k);
+  static forEach(m, fn) {
+    m.forEach(fn);
+  }
 }
 
 class ListWrapper {
   static List clone(List l) => new List.from(l);
   static List create() => new List();
+  static List createFixedSize(int size) => new List(size);
   static get(m, k) => m[k];
   static void set(m, k, v) { m[k] = v; }
   static contains(m, k) => m.containsKey(k);
+  static map(list, fn) => list.map(fn).toList();
+  static forEach(list, fn) {
+    list.forEach(fn);
+  }
+  static last(list) {
+    return list.last;
+  }
   static void push(List l, e) { l.add(e); }
 }
 

modules/facade/src/collection.es6

@@ -6,18 +6,38 @@ export class MapWrapper {
   static create():HashMap { return new HashMap(); }
   static get(m, k) { return m[k]; }
   static set(m, k, v) { m[k] = v; }
-  static contains(m, k) { return  m.containsKey(k); }
+  static contains(m, k) { return  m[k] != undefined; }
+  static forEach(m, fn) {
+    for(var k in m) {
+      fn(k, m[k]);
+    }
+  }
 }
 
 
 export class ListWrapper {
   static create():List { return new List(); }
+  static createFixedSize(size):List { return new List(); }
   static get(m, k) { return m[k]; }
   static set(m, k, v) { m[k] = v; }
   static clone(array) {
     return Array.prototype.slice.call(array, 0);
   }
-  static push(l, e) { l.push(e); }
+  static map(array, fn) {
+    return array.map(fn);
+  }
+  static forEach(array, fn) {
+    for(var p of array) {
+      fn(p);
+    }
+  }
+  static push(array, el) {
+    array.push(el);
+  }
+  static last(array) {
+    if (!array || array.length == 0) return null;
+    return array[array.length - 1];
+  }
 }
 
 export class SetWrapper {

modules/facade/src/di/reflector.dart

@@ -0,0 +1,57 @@
+library facade.di.reflector;
+
+import 'dart:mirrors';
+
+class Inject {
+  final Object token;
+  const Inject(this.token);
+}
+
+class Reflector {
+  factoryFor(Type type) {
+    return _generateFactory(type);
+  }
+
+  convertToFactory(Function factory) {
+    return (args) => Function.apply(factory, args);
+  }
+
+  Function _generateFactory(Type type) {
+    ClassMirror classMirror = reflectType(type);
+    MethodMirror ctor = classMirror.declarations[classMirror.simpleName];
+    Function create = classMirror.newInstance;
+    Symbol name = ctor.constructorName;
+    return (args) => create(name, args).reflectee;
+  }
+
+  dependencies(Type type) {
+    ClassMirror classMirror = reflectType(type);
+    MethodMirror ctor = classMirror.declarations[classMirror.simpleName];
+
+    return new List.generate(ctor.parameters.length, (int pos) {
+      ParameterMirror p = ctor.parameters[pos];
+
+      if (p.type.qualifiedName == #dynamic) {
+        var name = MirrorSystem.getName(p.simpleName);
+        throw "Error getting params for '$type': "
+          "The '$name' parameter must be typed";
+      }
+
+      if (p.type is TypedefMirror) {
+        throw "Typedef '${p.type}' in constructor "
+        "'${classMirror.simpleName}' is not supported.";
+      }
+
+      ClassMirror pTypeMirror = (p.type as ClassMirror);
+      var pType = pTypeMirror.reflectedType;
+
+      final inject = p.metadata.map((m) => m.reflectee).where((m) => m is Inject);
+
+      if (inject.isNotEmpty) {
+        return inject.first.token;
+      } else {
+        return pType;
+      }
+    }, growable:false);
+  }
+}

modules/facade/src/di/reflector.es6

@@ -0,0 +1,41 @@
+import {Type} from 'facade/lang';
+
+//TODO: vsvakin: remove when const constructors are implemented
+export class Inject {
+  constructor(token){
+    this.token = token;
+  }
+}
+
+export class Reflector {
+  factoryFor(type:Type) {
+    return (args) => new type(...args);
+  }
+
+  convertToFactory(factoryFunction:Function) {
+    return (args) => factoryFunction(...args);
+  }
+
+  dependencies(type:Type) {
+    var p = type.parameters;
+    if (p == undefined) return [];
+    return type.parameters.map((p) => this._extractToken(p));
+  }
+
+  _extractToken(annotations) {
+    var type, inject;
+    for (var paramAnnotation of annotations) {
+      if (isFunction(paramAnnotation)) {
+        type = paramAnnotation;
+
+      } else if (paramAnnotation instanceof Inject) {
+        inject = paramAnnotation.token;
+      }
+    }
+    return inject != undefined ? inject : type;
+  }
+}
+
+function isFunction(value) {
+  return typeof value === 'function';
+}

modules/facade/src/lang.dart

@@ -1,7 +1,6 @@
-library angular.core.facade.async;
+library angular.core.facade.lang;
 
-export 'dart:async' show Future;
-export 'dart:core' show Type, int;
+export 'dart:core' show Type;
 
 class FIELD {
   final String definition;
@@ -19,6 +18,10 @@ class IMPLEMENTS {
   const IMPLEMENTS(this.interfaceClass);
 }
 
+bool isPresent(obj) => obj != null;
+bool isBlank(obj) => obj == null;
+
+String humanize(obj) => obj.toString();
 
 class StringWrapper {
   static String fromCharCode(int code) {

modules/facade/src/lang.es6

@@ -1,4 +1,3 @@
-export var Future = Promise;
 export var Type = Function;
 
 export class FIELD {
@@ -12,6 +11,30 @@ export class ABSTRACT {}
 export class IMPLEMENTS {}
 
 
+export function isPresent(obj){
+  return obj != undefined && obj != null;
+}
+
+export function isBlank(obj){
+  return obj == undefined || obj == null;
+}
+
+export function humanize(token) {
+  if (typeof token === 'string') {
+    return token;
+  }
+
+  if (token === undefined || token === null) {
+    return '' + token;
+  }
+
+  if (token.name) {
+    return token.name;
+  }
+
+  return token.toString();
+}
+
 export class StringWrapper {
   static fromCharCode(code:int) {
     return String.fromCharCode(code);

modules/test_lib/src/test_lib.dart

@@ -1,5 +1,45 @@
 library test_lib.test_lib;
-export 'package:guinness/guinness.dart' show
-    describe, ddescribe, xdescribe,
-    it, xit, iit,
-    beforeEach, afterEach, expect;
+
+import 'package:guinness/guinness_html.dart' as gns;
+export 'package:guinness/guinness_html.dart';
+import 'package:unittest/unittest.dart' hide expect;
+import 'dart:mirrors';
+import 'dart:async';
+
+Expect expect(actual, [matcher]) {
+  final expect = new Expect(actual);
+  if (matcher != null) expect.to(matcher);
+  return expect;
+}
+
+class Expect extends gns.Expect {
+  Expect(actual) : super(actual);
+
+  void toThrowError(message) => this.toThrowWith(message: message);
+  void toBeFuture() => _expect(actual is Future, equals(true));
+  Function get _expect => gns.guinness.matchers.expect;
+}
+
+it(name, fn) {
+  gns.it(name, _handleAsync(fn));
+}
+
+iit(name, fn) {
+  gns.iit(name, _handleAsync(fn));
+}
+
+_handleAsync(fn) {
+  ClosureMirror cm = reflect(fn);
+  MethodMirror mm = cm.function;
+
+  var completer = new Completer();
+
+  if (mm.parameters.length == 1) {
+    return () {
+      cm.apply([completer.complete]);
+      return completer.future;
+    };
+  }
+
+  return fn;
+}

modules/test_lib/src/test_lib.es6

@@ -16,3 +16,35 @@ window.print = function(msg) {
     window.console.log(msg);
   }
 };
+
+window.beforeEach(function() {
+  jasmine.addMatchers({
+    toBeFuture: function() {
+      return {
+        compare: function (actual, expectedClass) {
+          var pass = typeof actual === 'object' && typeof actual.then === 'function';
+          return {
+            pass: pass,
+            get message() {
+              return 'Expected ' + actual + ' to be a future';
+            }
+          };
+        }
+      };
+    },
+
+    toBeAnInstanceOf: function() {
+      return {
+        compare: function(actual, expectedClass) {
+          var pass = typeof actual === 'object' && actual instanceof expectedClass;
+          return {
+            pass: pass,
+            get message() {
+              return 'Expected ' + actual + ' to be an instance of ' + expectedClass;
+            }
+          };
+        }
+      };
+    }
+  });
+});

tools/transpiler/src/codegeneration/ClassTransformer.js

@@ -73,7 +73,8 @@ export class ClassTransformer extends ParseTreeTransformer {
         // Collect all fields, defined in the constructor.
         elementTree.body.statements.forEach(function(statement) {
           var exp = statement.expression;
-          if (exp.type === BINARY_EXPRESSION &&
+          if (exp &&
+              exp.type === BINARY_EXPRESSION &&
               exp.operator.type === EQUAL &&
               exp.left.type === MEMBER_EXPRESSION &&
               exp.left.operand.type === THIS_EXPRESSION) {
@@ -170,7 +171,8 @@ export class ClassTransformer extends ParseTreeTransformer {
     var superCall = null;
 
     body.statements.forEach(function (statement) {
-      if (statement.expression.type === CALL_EXPRESSION &&
+      if (statement.expression &&
+          statement.expression.type === CALL_EXPRESSION &&
           statement.expression.operand.type === SUPER_EXPRESSION) {
         superCall = statement.expression;
       } else {

tools/transpiler/src/outputgeneration/DartParseTreeWriter.js

@@ -11,7 +11,8 @@ import {
   OPEN_CURLY,
   OPEN_PAREN,
   SEMI_COLON,
-  STAR
+  STAR,
+  STATIC
 } from 'traceur/src/syntax/TokenType';
 
 import {ParseTreeWriter as JavaScriptParseTreeWriter, ObjectLiteralExpression} from 'traceur/src/outputgeneration/ParseTreeWriter';