refactor(transformer): updates in properties syntax

Author: vicb

modules/angular2/src/transform/bind_generator/generator.dart

@@ -48,9 +48,16 @@ Map<String, String> _createBindMap(NgDeps ngDeps) {
   var visitor = new ExtractSettersVisitor();
   var bindMap = {};
   ngDeps.registeredTypes.forEach((RegisteredType t) {
-    visitor.bindMappings.clear();
+    visitor.bindConfig.clear();
     t.annotations.accept(visitor);
-    visitor.bindMappings.forEach((String prop, _) {
+    visitor.bindConfig.forEach((String config) {
+      var prop;
+      var idx = config.indexOf(':');
+      if (idx > 0) {
+        prop = config.substring(0, idx).trim();
+      } else {
+        prop = config;
+      }
       if (bindMap.containsKey(prop)) {
         bindMap[prop] = '';
       } else {

modules/angular2/src/transform/bind_generator/visitor.dart

@@ -7,21 +7,17 @@ import 'package:angular2/src/transform/common/logging.dart';
 /// `registerType` call and pulling out the properties of any "bind"
 /// values found.
 class ExtractSettersVisitor extends Object with RecursiveAstVisitor<Object> {
-  final Map<String, String> bindMappings = {};
   final ConstantEvaluator _evaluator = new ConstantEvaluator();
+  final List<String> bindConfig = [];
 
   @override
   Object visitNamedExpression(NamedExpression node) {
     if ('${node.name.label}' == 'properties') {
       var evaluated = node.expression.accept(_evaluator);
-      if (evaluated is Map) {
-        evaluated.forEach((key, value) {
-          if (value != null) {
-            bindMappings[key] = '$value';
-          }
-        });
+      if (evaluated is List) {
+        bindConfig.addAll(evaluated);
       } else {
-        logger.error('`properties` currently only supports Map values');
+        logger.error('`properties` currently only supports List values');
       }
       return null;
     }

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

@@ -179,9 +179,23 @@ class _DirectiveMetadataVisitor extends Object
     });
   }
 
+  /// Evaluates the [List] represented by `expression` and adds all values,
+  /// to `list`. If `expression` does not evaluate to a [List], throws a
+  /// descriptive [FormatException].
+  void _populateList(Expression expression, List list, String propertyName) {
+    var evaluated = expression.accept(_evaluator);
+    if (evaluated is! List) {
+      throw new FormatException(
+          'Angular 2 expects a List but could not understand the value for '
+          '$propertyName.', '$expression' /* source */);
+    }
+    list.addAll(evaluated);
+
+  }
+
   void _populateProperties(Expression propertiesValue) {
     _checkMeta();
-    _populateMap(propertiesValue, meta.properties, 'Directive#properties');
+    _populateList(propertiesValue, meta.properties, 'Directive#properties');
   }
 
   void _populateHostListeners(Expression hostListenersValue) {

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

@@ -63,10 +63,8 @@ void allTests() {
           'directive_metadata_files/properties.ng_deps.dart');
       expect(metadata.properties).toBeNotNull();
       expect(metadata.properties.length).toBe(2);
-      expect(metadata.properties).toContain('key1');
-      expect(metadata.properties['key1']).toEqual('val1');
-      expect(metadata.properties).toContain('key2');
-      expect(metadata.properties['key2']).toEqual('val2');
+      expect(metadata.properties).toContain('key1: val1');
+      expect(metadata.properties).toContain('key2: val2');
     });
 
     it('should parse host listeners.', () async {

modules/angular2/test/transform/integration/simple_annotation_files/expected/bar.ng_meta.json

@@ -7,7 +7,7 @@
     "hostProperties": {},
     "hostAttributes": {},
     "hostActions": null,
-    "properties": {},
+    "properties": [],
     "readAttributes": [],
     "type": 1,
     "version": 1

modules/angular2/test/transform/template_compiler/duplicate_files/hello.ng_meta.json

@@ -6,7 +6,7 @@
     "compileChildren":true,
     "hostListeners":{},
     "hostProperties":{},
-    "properties":{},
+    "properties":[],
     "readAttributes":[],
     "type":1,
     "version":1

modules/angular2/test/transform/template_compiler/inline_expression_files/hello.ng_meta.json

@@ -6,7 +6,7 @@
     "compileChildren":true,
     "hostListeners":{},
     "hostProperties":{},
-    "properties":{},
+    "properties":[],
     "readAttributes":[],
     "type":1,
     "version":1

modules/angular2/test/transform/template_compiler/inline_method_files/hello.ng_meta.json

@@ -6,7 +6,7 @@
     "compileChildren":true,
     "hostListeners":{},
     "hostProperties":{},
-    "properties":{},
+    "properties":[],
     "readAttributes":[],
     "type":1,
     "version":1

modules/angular2/test/transform/template_compiler/one_directive_files/hello.ng_meta.json

@@ -5,8 +5,8 @@
     "selector":"hello-app",
     "compileChildren":true,
     "hostListeners":{},
-    "hostProperties":{},
-    "properties":{},
+    "hostProperties":[],
+    "properties":[],
     "readAttributes":[],
     "type":1,
     "version":1
@@ -17,7 +17,7 @@
     "compileChildren":true,
     "hostListeners":{},
     "hostProperties":{},
-    "properties":{},
+    "properties":[],
     "readAttributes":[],
     "type":1,
     "version":1

modules/angular2/test/transform/template_compiler/url_expression_files/hello.ng_meta.json

@@ -6,7 +6,7 @@
     "compileChildren":true,
     "hostListeners":{},
     "hostProperties":{},
-    "properties":{},
+    "properties":[],
     "readAttributes":[],
     "type":1,
     "version":1