feat(ng-repeat): initial implementaion of ng-repeat.

- adds support for content bindings via '[]'.
- directives module

.gitignore

@@ -17,6 +17,7 @@ node_modules
 pubspec.lock
 .c9
 .idea/
+*.swo
 
 
 /docs/bower_components/

karma-dart.conf.js

@@ -46,6 +46,7 @@ module.exports = function(config) {
       '/packages/change_detection': 'http://localhost:9877/base/modules/change_detection/src',
       '/packages/reflection': 'http://localhost:9877/base/modules/reflection/src',
       '/packages/di': 'http://localhost:9877/base/modules/di/src',
+      '/packages/directives': 'http://localhost:9877/base/modules/directives/src',
       '/packages/facade': 'http://localhost:9877/base/modules/facade/src',
       '/packages/test_lib': 'http://localhost:9877/base/modules/test_lib/src',
     },

modules/core/src/compiler/pipeline/element_binder_builder.js

@@ -118,11 +118,16 @@ export class ElementBinderBuilder extends CompileStep {
           throw new BaseException('No element binding found for property '+elProp
             +' which is required by directive '+stringify(typeWithAnnotation.type));
         }
+        var len = dirProp.length;
+        var dirBindingName = dirProp;
+        var isContentWatch = dirProp[len - 2] === '[' && dirProp[len - 1] === ']';
+        if (isContentWatch) dirBindingName = dirProp.substring(0, len - 2);
         protoView.bindDirectiveProperty(
           directiveIndex++,
           expression,
-          dirProp,
-          reflector.setter(dirProp)
+          dirBindingName,
+          reflector.setter(dirBindingName),
+          isContentWatch
         );
       });
     });

modules/core/src/compiler/view.js

@@ -417,7 +417,8 @@ export class ProtoView {
     directiveIndex:number,
     expression:AST,
     setterName:string,
-    setter:SetterFn) {
+    setter:SetterFn,
+    isContentWatch: boolean) {
 
     var expMemento = new DirectivePropertyMemento(
       this.elementBinders.length-1,
@@ -426,7 +427,7 @@ export class ProtoView {
       setter
     );
     var groupMemento = DirectivePropertyGroupMemento.get(expMemento);
-    this.protoRecordRange.addRecordsFromAST(expression, expMemento, groupMemento, false);
+    this.protoRecordRange.addRecordsFromAST(expression, expMemento, groupMemento, isContentWatch);
   }
 
   // Create a rootView as if the compiler encountered <rootcmp></rootcmp>,
@@ -500,7 +501,7 @@ class DirectivePropertyGroupMemento {
     var directiveIndex = memento._directiveIndex;
     var id = elementInjectorIndex * 100 + directiveIndex;
 
-    if (! MapWrapper.contains(_groups, id)) {
+    if (!MapWrapper.contains(_groups, id)) {
       MapWrapper.set(_groups, id, new DirectivePropertyGroupMemento(elementInjectorIndex, directiveIndex));
     }
     return MapWrapper.get(_groups, id);

modules/core/src/compiler/viewport.js

@@ -37,7 +37,11 @@ export class ViewPort {
   dehydrate() {
     this.appInjector = null;
     this.hostElementInjector = null;
-    for (var i = 0; i < this._views.length; i++) {
+    this.clear();
+  }
+
+  clear() {
+    for (var i = this._views.length - 1; i >= 0; i--) {
       this.remove(i);
     }
   }

modules/core/test/compiler/view_spec.js

@@ -382,7 +382,7 @@ export function main() {
           var pv = new ProtoView(createElement('<div class="ng-binding"></div>'),
             new ProtoRecordRange());
           pv.bindElement(new ProtoElementInjector(null, 0, [SomeDirective]));
-          pv.bindDirectiveProperty(0, parser.parseBinding('foo'), 'prop', reflector.setter('prop'));
+          pv.bindDirectiveProperty(0, parser.parseBinding('foo'), 'prop', reflector.setter('prop'), false);
           createViewAndChangeDetector(pv);
 
           ctx.foo = 'buz';
@@ -395,8 +395,8 @@ export function main() {
             new ProtoRecordRange());
 
           pv.bindElement(new ProtoElementInjector(null, 0, [DirectiveImplementingOnChange]));
-          pv.bindDirectiveProperty( 0, parser.parseBinding('a'), 'a', reflector.setter('a'));
-          pv.bindDirectiveProperty( 0, parser.parseBinding('b'), 'b', reflector.setter('b'));
+          pv.bindDirectiveProperty( 0, parser.parseBinding('a'), 'a', reflector.setter('a'), false);
+          pv.bindDirectiveProperty( 0, parser.parseBinding('b'), 'b', reflector.setter('b'), false);
           createViewAndChangeDetector(pv);
 
           ctx.a = 100;
@@ -412,9 +412,10 @@ export function main() {
             new ProtoRecordRange());
 
           pv.bindElement(new ProtoElementInjector(null, 0, [DirectiveImplementingOnChange]));
-          pv.bindDirectiveProperty( 0, parser.parseBinding('a').ast, 'a', reflector.setter('a'));
-          pv.bindDirectiveProperty( 0, parser.parseBinding('b').ast, 'b', reflector.setter('b'));
-          createView(pv);
+          pv.bindDirectiveProperty( 0, parser.parseBinding('a').ast, 'a', reflector.setter('a'), false);
+          pv.bindDirectiveProperty( 0, parser.parseBinding('b').ast, 'b', reflector.setter('b'), false);
+          createViewAndChangeDetector(pv);
+
           ctx.a = 0;
           ctx.b = 0;
           cd.detectChanges();

modules/directives/pubspec.yaml

@@ -0,0 +1,18 @@
+name: directives
+environment:
+  sdk: '>=1.4.0'
+dependencies:
+  core:
+    path: ../core
+  change_detection:
+    path: ../change_detection
+  di:
+    path: ../di
+  facade:
+    path: ../facade
+  reflection:
+    path: ../reflection
+dev_dependencies:
+  test_lib:
+    path: ../test_lib
+  guinness: ">=0.1.16 <0.2.0"

modules/directives/src/ng_repeat.js

@@ -0,0 +1,94 @@
+import {describe, xit, it, expect, beforeEach, ddescribe, iit} from 'test_lib/test_lib';
+
+import {Decorator, Component, Template} from 'core/annotations/annotations';
+import {OnChange} from 'core/compiler/interfaces';
+import {ViewPort} from 'core/compiler/viewport';
+import {View} from 'core/compiler/view';
+import {isPresent, isBlank} from 'facade/lang';
+import {ListWrapper, List} from 'facade/collection';
+
+@Template({
+  selector: '[ng-repeat]',
+  bind: {
+    'in': 'iterable[]'
+  }
+})
+export class NgRepeat extends OnChange {
+  viewPort: ViewPort;
+  iterable;
+  constructor(viewPort: ViewPort) {
+    this.viewPort = viewPort;
+  }
+  onChange(changes) {
+    var iteratorChanges = changes['iterable'];
+    if (isBlank(iteratorChanges) || isBlank(iteratorChanges.currentValue)) {
+      this.viewPort.clear();
+      return;
+    }
+
+    // TODO(rado): check if change detection can produce a change record that is
+    // easier to consume than current.
+    var recordViewTuples = [];
+    iteratorChanges.currentValue.forEachRemovedItem(
+      (removedRecord) => ListWrapper.push(recordViewTuples, new RecordViewTuple(removedRecord, null))
+    );
+
+    iteratorChanges.currentValue.forEachMovedItem(
+      (movedRecord) => ListWrapper.push(recordViewTuples, new RecordViewTuple(movedRecord, null))
+    );
+
+    var insertTuples = NgRepeat.bulkRemove(recordViewTuples, this.viewPort);
+
+    iteratorChanges.currentValue.forEachAddedItem(
+      (addedRecord) => ListWrapper.push(insertTuples, new RecordViewTuple(addedRecord, null))
+    );
+
+    NgRepeat.bulkInsert(insertTuples, this.viewPort);
+
+    for (var i = 0; i < insertTuples.length; i++) {
+      this.perViewChange(insertTuples[i].view, insertTuples[i].record);
+    }
+  }
+
+  perViewChange(view, record) {
+    view.setLocal('ng-repeat', record.item);
+    // Uncomment when binding is ready.
+    // view.setLocal('index', record.item);
+  }
+
+  static bulkRemove(tuples, viewPort) {
+    tuples.sort((a, b) => a.record.previousIndex - b.record.previousIndex);
+    var movedTuples = [];
+    for (var i = tuples.length - 1; i >= 0; i--) {
+      var tuple = tuples[i];
+      var view = viewPort.remove(tuple.record.previousIndex);
+      if (isPresent(tuple.record.currentIndex)) {
+        tuple.view = view;
+        ListWrapper.push(movedTuples, tuple);
+      }
+    }
+    return movedTuples;
+  }
+
+  static bulkInsert(tuples, viewPort) {
+    tuples.sort((a, b) => a.record.currentIndex - b.record.currentIndex);
+    for (var i = 0; i < tuples.length; i++) {
+      var tuple = tuples[i];
+      if (isPresent(tuple.view)) {
+        viewPort.insert(tuple.view, tuple.record.currentIndex);
+      } else {
+        tuple.view = viewPort.create(tuple.record.currentIndex);
+      }
+    }
+    return tuples;
+  }
+}
+
+class RecordViewTuple {
+  view: View;
+  record: any;
+  constructor(record, view) {
+    this.record = record;
+    this.view = view;
+  }
+}

modules/directives/test/ng_repeat_spec.js

@@ -0,0 +1,239 @@
+import {describe, xit, it, expect, beforeEach, ddescribe, iit} from 'test_lib/test_lib';
+
+import {DOM} from 'facade/dom';
+
+import {Injector} from 'di/di';
+import {ChangeDetector} from 'change_detection/change_detector';
+import {Parser} from 'change_detection/parser/parser';
+import {Lexer} from 'change_detection/parser/lexer';
+
+import {Compiler, CompilerCache} from 'core/compiler/compiler';
+import {OnChange} from 'core/compiler/interfaces';
+import {DirectiveMetadataReader} from 'core/compiler/directive_metadata_reader';
+
+import {Decorator, Component, Template} from 'core/annotations/annotations';
+import {TemplateConfig} from 'core/annotations/template_config';
+
+import {ViewPort} from 'core/compiler/viewport';
+import {MapWrapper, ListWrapper} from 'facade/collection';
+import {NgRepeat} from 'directives/ng_repeat';
+
+export function main() {
+  describe('ng-repeat', () => {
+    var view, cd, compiler, component;
+    beforeEach(() => {
+      compiler = new Compiler(null, new DirectiveMetadataReader(), new Parser(new Lexer()), new CompilerCache());
+    });
+
+    function createElement(html) {
+      return DOM.createTemplate(html).content.firstChild;
+    }
+
+    function createView(pv) {
+      component = new TestComponent();
+      view = pv.instantiate(null);
+      view.hydrate(new Injector([]), null, component);
+      cd = new ChangeDetector(view.recordRange);
+    }
+
+    function compileWithTemplate(template) {
+      return compiler.compile(TestComponent, createElement(template));
+    }
+
+    var TEMPLATE = '<div><copy-me template="ng-repeat #item in items">{{item.toString()}};</copy-me></div>';
+
+    it('should reflect initial elements', (done) => {
+      compileWithTemplate(TEMPLATE).then((pv) => {
+        createView(pv);
+        cd.detectChanges();
+
+        expect(DOM.getText(view.nodes[0])).toEqual('1;2;');
+        done();
+      });
+    });
+
+    it('should reflect added elements', (done) => {
+      compileWithTemplate(TEMPLATE).then((pv) => {
+        createView(pv);
+        cd.detectChanges();
+
+        ListWrapper.push(component.items, 3);
+        cd.detectChanges();
+
+        expect(DOM.getText(view.nodes[0])).toEqual('1;2;3;');
+        done();
+      });
+    });
+
+    it('should reflect removed elements', (done) => {
+      compileWithTemplate(TEMPLATE).then((pv) => {
+        createView(pv);
+        cd.detectChanges();
+
+        ListWrapper.removeAt(component.items, 1);
+        cd.detectChanges();
+
+        expect(DOM.getText(view.nodes[0])).toEqual('1;');
+        done();
+      });
+    });
+
+    it('should reflect moved elements', (done) => {
+      compileWithTemplate(TEMPLATE).then((pv) => {
+        createView(pv);
+        cd.detectChanges();
+
+        ListWrapper.removeAt(component.items, 0);
+        ListWrapper.push(component.items, 1);
+        cd.detectChanges();
+
+        expect(DOM.getText(view.nodes[0])).toEqual('2;1;');
+        done();
+      });
+    });
+
+    it('should reflect a mix of all changes (additions/removals/moves)', (done) => {
+      compileWithTemplate(TEMPLATE).then((pv) => {
+        createView(pv);
+        component.items = [0, 1, 2, 3, 4, 5];
+        cd.detectChanges();
+
+        component.items = [6, 2, 7, 0, 4, 8];
+        cd.detectChanges();
+
+        expect(DOM.getText(view.nodes[0])).toEqual('6;2;7;0;4;8;');
+        done();
+      });
+    });
+
+    it('should iterate over an array of objects', () => {
+      compileWithTemplate('<ul><li template="ng-repeat #item in items">{{item["name"]}};</li></ul>').then((pv) => {
+        createView(pv);
+
+        // INIT
+        component.items = [{'name': 'misko'}, {'name':'shyam'}];
+        cd.detectChanges();
+        expect(DOM.getText(view.nodes[0])).toEqual('misko;shyam;');
+
+        // GROW
+        ListWrapper.push(component.items, {'name': 'adam'});
+        cd.detectChanges();
+
+        expect(DOM.getText(view.nodes[0])).toEqual('misko;shyam;adam;');
+
+        // SHRINK
+        ListWrapper.removeAt(component.items, 2);
+        ListWrapper.removeAt(component.items, 0);
+        cd.detectChanges();
+
+        expect(DOM.getText(view.nodes[0])).toEqual('shyam;');
+      });
+    });
+
+    it('should gracefully handle nulls', (done) => {
+      compileWithTemplate('<ul><li template="ng-repeat #item in null">{{item}};</li></ul>').then((pv) => {
+        createView(pv);
+        cd.detectChanges();
+        expect(DOM.getText(view.nodes[0])).toEqual('');
+        done();
+      });
+    });
+
+    it('should gracefully handle ref changing to null and back', (done) => {
+      compileWithTemplate(TEMPLATE).then((pv) => {
+        createView(pv);
+        cd.detectChanges();
+        expect(DOM.getText(view.nodes[0])).toEqual('1;2;');
+
+        component.items = null;
+        cd.detectChanges();
+        expect(DOM.getText(view.nodes[0])).toEqual('');
+
+        component.items = [1, 2, 3];
+        cd.detectChanges();
+        expect(DOM.getText(view.nodes[0])).toEqual('1;2;3;');
+        done();
+      });
+    });
+
+    it('should throw on ref changing to string', (done) => {
+      compileWithTemplate(TEMPLATE).then((pv) => {
+        createView(pv);
+        cd.detectChanges();
+        expect(DOM.getText(view.nodes[0])).toEqual('1;2;');
+
+        component.items = 'whaaa';
+        expect(() => cd.detectChanges()).toThrowError();
+        done();
+      });
+    });
+
+    it('should works with duplicates', (done) => {
+      compileWithTemplate(TEMPLATE).then((pv) => {
+        createView(pv);
+        var a = new Foo();
+        component.items = [a, a];
+        cd.detectChanges();
+        expect(DOM.getText(view.nodes[0])).toEqual('foo;foo;');
+        done();
+      });
+    });
+
+/*
+TODO(rado): enable after compiler is fixed.
+  it('should repeat over nested arrays', (done) => {
+    compileWithTemplate(
+        '<ul><li template="ng-repeat #item in items">{{item.toString()}}' +
+          '<li template="ng-repeat #subitem in item">' +
+          '{{subitem}};' +
+        '</li>X</li></ul>'
+    ).then((pv) => {
+      createView(pv);
+      component.items = [['a', 'b'], ['c','d']];
+      cd.detectChanges();
+      cd.detectChanges();
+      cd.detectChanges();
+      expect(DOM.getText(view.nodes[0])).toEqual('');
+      done();
+    });
+  });
+
+TODO(rado): enable after compiler is fixed.
+  it('should display indices correctly', (done) => {
+    var INDEX_TEMPLATE = '<div><copy-me template="ng-repeat #item in items index #i">{{index.toString()}};</copy-me></div>';
+    compileWithTemplate(INDEX_TEMPLATE).then((pv) => {
+      createView(pv);
+      component.items = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9];
+      cd.detectChanges();
+      expect(DOM.getText(view.nodes[0])).toEqual('0123456789');
+
+      component.items = [1, 2, 6, 7, 4, 3, 5, 8, 9, 0];
+      cd.detectChanges();
+      expect(DOM.getText(view.nodes[0])).toEqual('0123456789');
+      done();
+    });
+  });
+*/
+  });
+}
+
+class Foo {
+  toString() {
+    return 'foo';
+  }
+}
+
+@Component({
+  selector: 'test-cmp',
+  template: new TemplateConfig({
+    inline: '',  // each test swaps with a custom template.
+    directives: [NgRepeat]
+  })
+})
+class TestComponent {
+  items: any;
+  item: any;
+  constructor() {
+    this.items = [1, 2];
+  }
+}

modules/facade/src/dom.dart

@@ -53,6 +53,9 @@ class DOM {
   static insertAfter(el, node) {
     el.parentNode.insertBefore(node, el.nextNode);
   }
+  static getText(Element el) {
+    return el.text;
+  }
   static setText(Text text, String value) {
     text.text = value;
   }

modules/facade/src/dom.es6

@@ -49,6 +49,9 @@ export class DOM {
   static setInnerHTML(el, value) {
     el.innerHTML = value;
   }
+  static getText(el: Element) {
+    return el.textContent;
+  }
   static setText(text:Text, value:string) {
     text.nodeValue = value;
   }

test-main.js

@@ -24,6 +24,9 @@ System.paths = {
   'di/*': './di/src/*.js',
   'di/test/*': './di/test/*.js',
 
+  'directives/*': './directives/src/*.js',
+  'directives/test/*': './directives/test/*.js',
+
   'reflection/*': './reflection/src/*.js',
   'reflection/test/*': './reflection/test/*.js',
 

tools/build/runtime_paths.js

@@ -3,6 +3,7 @@ System.paths = {
   'change_detection/*': '/change_detection/lib/*.js',
   'facade/*': '/facade/lib/*.js',
   'di/*': '/di/lib/*.js',
+  'directives/*': '/directives/lib/*.js',
   'rtts_assert/*': '/rtts_assert/lib/*.js',
   'test_lib/*': '/test_lib/lib/*.js',
   'reflection/*': '/reflection/lib/*.js',