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packages/template_binding/test/binding_syntax.dart

Index: packages/template_binding/test/binding_syntax.dart
diff --git a/packages/template_binding/test/binding_syntax.dart b/packages/template_binding/test/binding_syntax.dart
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+// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+library template_binding.test.binding_syntax;
+
+import 'dart:async';
+import 'dart:collection';
+import 'dart:html';
+import 'package:template_binding/template_binding.dart';
+import 'package:observe/observe.dart';
+import 'package:unittest/unittest.dart';
+import 'utils.dart';
+
+// Note: this test is executed by template_element_test.dart
+
+syntaxTests(FooBarModel fooModel([foo, bar])) {
+  test('prepareBinding', () {
+    var model = fooModel('bar');
+    var testSyntax = new TestBindingSyntax();
+    var div = createTestHtml(
+        '<template bind>{{ foo }}'
+          '<template bind>{{ foo }}</template>'
+        '</template>');
+    var template = templateBind(div.firstChild);
+    template
+      ..model = model
+      ..bindingDelegate = testSyntax;
+    return new Future(() {
+      expect(div.nodes.length, 4);
+      expect(div.nodes.last.text, 'bar');
+      expect(div.nodes[2].tagName, 'TEMPLATE');
+      expect(testSyntax.log, [
+        ['prepare', '', 'bind', 'TEMPLATE'],
+        ['bindFn', model, 'TEMPLATE', 0],
+        ['prepare', 'foo', 'text', 'TEXT'],
+        ['prepare', '', 'bind', 'TEMPLATE'],
+        ['bindFn', model, 'TEXT', 2],
+        ['bindFn', model, 'TEMPLATE', 3],
+        ['prepare', 'foo', 'text', 'TEXT'],
+        ['bindFn', model, 'TEXT', 6],
+      ]);
+    });
+  });
+
+  test('prepareInstanceModel', () {
+    var model = toObservable([fooModel(1), fooModel(2), fooModel(3)]);
+
+    var testSyntax = new TestModelSyntax();
+    testSyntax.altModels.addAll([fooModel('a'), fooModel('b'), fooModel('c')]);
+
+    var div = createTestHtml('<template repeat>{{ foo }}</template>');
+
+    var template = div.nodes[0];
+    templateBind(template)
+      ..model = model
+      ..bindingDelegate = testSyntax;
+    return new Future(() {
+
+      expect(div.nodes.length, 4);
+      expect(div.nodes[0].tagName, 'TEMPLATE');
+      expect(div.nodes[1].text, 'a');
+      expect(div.nodes[2].text, 'b');
+      expect(div.nodes[3].text, 'c');
+
+      expect(testSyntax.log, [
+        ['prepare', template],
+        ['bindFn', model[0]],
+        ['bindFn', model[1]],
+        ['bindFn', model[2]],
+      ]);
+    });
+  });
+
+  test('prepareInstanceModel - reorder instances', () {
+    var model = toObservable([0, 1, 2]);
+
+    var div = createTestHtml('<template repeat>{{}}</template>');
+    var template = div.firstChild;
+    var delegate = new TestInstanceModelSyntax();
+
+    templateBind(template)
+      ..model = model
+      ..bindingDelegate = delegate;
+    return new Future(() {
+      expect(delegate.prepareCount, 1);
+      expect(delegate.callCount, 3);
+
+      // Note: intentionally mutate in place.
+      model.replaceRange(0, model.length, model.reversed.toList());
+    }).then(endOfMicrotask).then((_) {
+      expect(delegate.prepareCount, 1);
+      expect(delegate.callCount, 3);
+    });
+  });
+
+  test('prepareInstancePositionChanged', () {
+    var model = toObservable(['a', 'b', 'c']);
+
+    var div = createTestHtml('<template repeat>{{}}</template>');
+    var delegate = new TestPositionChangedSyntax();
+
+    var template = div.nodes[0];
+    templateBind(template)
+      ..model = model
+      ..bindingDelegate = delegate;
+    return new Future(() {
+
+      expect(div.nodes.length, 4);
+      expect(div.nodes[0].tagName, 'TEMPLATE');
+      expect(div.nodes[1].text, 'a');
+      expect(div.nodes[2].text, 'b');
+      expect(div.nodes[3].text, 'c');
+
+      expect(delegate.log, [
+        ['prepare', template],
+        ['bindFn', model[0], 0],
+        ['bindFn', model[1], 1],
+        ['bindFn', model[2], 2],
+      ]);
+
+      delegate.log.clear();
+
+      model.removeAt(1);
+    }).then(endOfMicrotask).then((_) {
+
+      expect(delegate.log, [['bindFn', 'c', 1]], reason: 'removed item');
+
+      expect(div.nodes.skip(1).map((n) => n.text), ['a', 'c']);
+    });
+  });
+
+
+  test('Update bindingDelegate with active template', () {
+    var model = toObservable([1, 2]);
+
+    var div = createTestHtml(
+        '<template repeat>{{ \$index }} - {{ \$ident }}</template>');
+    var template = templateBind(div.firstChild)
+      ..bindingDelegate = new UpdateBindingDelegateA()
+      ..model = model;
+
+    return new Future(() {
+      expect(div.nodes.length, 3);
+      expect(div.nodes[1].text, 'i:0 - a:1');
+      expect(div.nodes[2].text, 'i:1 - a:2');
+
+      expect(() {
+        template.bindingDelegate = new UpdateBindingDelegateB();
+      }, throws);
+
+      template.clear();
+      expect(div.nodes.length, 1);
+
+      template
+        ..bindingDelegate = new UpdateBindingDelegateB()
+        ..model = model;
+
+      model.add(3);
+    }).then(nextMicrotask).then((_) {
+      // All instances should reflect delegateB
+      expect(4, div.nodes.length);
+      expect(div.nodes[1].text, 'I:0 - A:1-narg');
+      expect(div.nodes[2].text, 'I:2 - A:2-narg');
+      expect(div.nodes[3].text, 'I:4 - A:3-narg');
+    });
+  });
+
+  test('Basic', () {
+    var model = fooModel(2, 4);
+    var div = createTestHtml(
+        '<template bind>'
+        '{{ foo }} + {{ 2x: bar }} + {{ 4x: bar }}</template>');
+    var template = templateBind(div.firstChild);
+    template
+      ..model = model
+      ..bindingDelegate = new TimesTwoSyntax();
+    return new Future(() {
+      expect(div.nodes.length, 2);
+      expect(div.nodes.last.text, '2 + 8 + ');
+
+      model.foo = 4;
+      model.bar = 8;
+    }).then(endOfMicrotask).then((_) {
+      expect(div.nodes.last.text, '4 + 16 + ');
+    });
+  });
+
+  test('CreateInstance', () {
+    var delegateFoo = new SimpleTextDelegate('foo');
+    var delegateBar = new SimpleTextDelegate('bar');
+
+    var div = createTestHtml('<template bind>[[ 2x: bar ]]</template>');
+    var template = templateBind(div.firstChild);
+    template..bindingDelegate = delegateFoo..model = {};
+
+    return new Future(() {
+      expect(div.nodes.length, 2);
+      expect(div.lastChild.text, 'foo');
+
+      var fragment = template.createInstance({});
+      expect(fragment.nodes.length, 1);
+      expect(fragment.lastChild.text, 'foo');
+
+      fragment = template.createInstance({}, delegateBar);
+      expect(fragment.nodes.length, 1);
+      expect(fragment.lastChild.text, 'bar');
+    });
+  });
+
+  // Note: issue-141 test not included here as it's not related to the
+  // BindingDelegate
+}
+
+// TODO(jmesserly): mocks would be cleaner here.
+
+class TestBindingSyntax extends BindingDelegate {
+  var log = [];
+
+  prepareBinding(String path, String name, Node node) {
+    var tagName = node is Element ? node.tagName : 'TEXT';
+    int id = log.length;
+    log.add(['prepare', path, name, tagName]);
+    final outerNode = node;
+    return (model, node, oneTime) {
+      var tagName = node is Element ? node.tagName : 'TEXT';
+      log.add(['bindFn', model, tagName, id]);
+      return oneTime ? new PropertyPath(path).getValueFrom(model) :
+          new PathObserver(model, path);
+    };
+  }
+}
+
+class SimpleTextDelegate extends BindingDelegate {
+  final String text;
+  SimpleTextDelegate(this.text);
+
+  prepareBinding(path, name, node) =>
+      name != 'text' ? null : (_, __, ___) => text;
+}
+
+class TestModelSyntax extends BindingDelegate {
+  var log = [];
+  var altModels = new ListQueue();
+
+  prepareInstanceModel(template) {
+    log.add(['prepare', template]);
+    return (model) {
+      log.add(['bindFn', model]);
+      return altModels.removeFirst();
+    };
+  }
+}
+
+class TestInstanceModelSyntax extends BindingDelegate {
+  int prepareCount = 0;
+  int callCount = 0;
+  prepareInstanceModel(template) {
+    prepareCount++;
+    return (model) {
+      callCount++;
+      return model;
+    };
+  }
+}
+
+
+class TestPositionChangedSyntax extends BindingDelegate {
+  var log = [];
+
+  prepareInstancePositionChanged(template) {
+    int id = log.length;
+    log.add(['prepare', template]);
+    return (templateInstance, index) {
+      log.add(['bindFn', templateInstance.model, index]);
+    };
+  }
+}
+
+
+class TimesTwoSyntax extends BindingDelegate {
+  prepareBinding(path, name, node) {
+    path = path.trim();
+    if (!path.startsWith('2x:')) return null;
+
+    path = path.substring(3);
+    return (model, _, oneTime) {
+      return new ObserverTransform(new PathObserver(model, path), (x) => 2 * x);
+    };
+  }
+}
+
+class UpdateBindingDelegateBase extends BindingDelegate {
+  bindingHandler(prefix, path) => (model, _, oneTime) =>
+      new ObserverTransform(new PathObserver(model, path), (x) => '$prefix:$x');
+}
+
+class UpdateBindingDelegateA extends UpdateBindingDelegateBase {
+  prepareBinding(path, name, node) {
+    if (path == '\$ident') return bindingHandler('a', 'id');
+    if (path == '\$index') return bindingHandler('i', 'index');
+  }
+
+  prepareInstanceModel(template) => (model) => toObservable({ 'id': model });
+
+  prepareInstancePositionChanged(template) => (templateInstance, index) {
+    templateInstance.model['index'] = index;
+  };
+}
+
+class UpdateBindingDelegateB extends UpdateBindingDelegateBase {
+  prepareBinding(path, name, node) {
+    if (path == '\$ident') return bindingHandler('A', 'id');
+    if (path == '\$index') return bindingHandler('I', 'index');
+  }
+
+  prepareInstanceModel(template) =>
+      (model) => toObservable({ 'id': '${model}-narg' });
+
+
+  prepareInstancePositionChanged(template) => (templateInstance, index) {
+    templateInstance.model['index'] = 2 * index;
+  };
+}
+