JS templates

sdk/lib/_internal/compiler/implementation/js_backend/native_emitter.dart

Index: sdk/lib/_internal/compiler/implementation/js_backend/native_emitter.dart
diff --git a/sdk/lib/_internal/compiler/implementation/js_backend/native_emitter.dart b/sdk/lib/_internal/compiler/implementation/js_backend/native_emitter.dart
index 6866b254348c46b31d8d3432935bfee756289371..52284600962a8bf3694d1ff7340d890fe107884c 100644
--- a/sdk/lib/_internal/compiler/implementation/js_backend/native_emitter.dart
+++ b/sdk/lib/_internal/compiler/implementation/js_backend/native_emitter.dart
@@ -54,9 +54,9 @@ class NativeEmitter {
     return backend.namer.isolateAccess(element);
   }
 
-  String get defPropName {
+  jsAst.Expression get defPropFunction {
     Element element = compiler.findHelper('defineProperty');
-    return backend.namer.isolateAccess(element);
+    return backend.namer.elementAccess(element);
   }
 
   String get toStringHelperName {
@@ -355,9 +355,7 @@ class NativeEmitter {
     FunctionSignature parameters = member.functionSignature;
     Element converter =
         compiler.findHelper('convertDartClosureToJS');
-    String closureConverter = backend.namer.isolateAccess(converter);
-    Set<String> stubParameterNames = new Set<String>.from(
-        stubParameters.map((param) => param.name));
+    jsAst.Expression closureConverter = backend.namer.elementAccess(converter);
     parameters.forEachParameter((ParameterElement parameter) {
       String name = parameter.name;
       // If [name] is not in [stubParameters], then the parameter is an optional
@@ -371,7 +369,8 @@ class NativeEmitter {
             FunctionType functionType = type;
             int arity = functionType.computeArity();
             statements.add(
-                js('$name = $closureConverter($name, $arity)').toStatement());
+                js.statement('# = #(#, $arity)',
+                    [name, closureConverter, name]));
             break;
           }
         }
@@ -418,7 +417,8 @@ class NativeEmitter {
       arguments = argumentsBuffer.sublist(0,
           indexOfLastOptionalArgumentInParameters + 1);
     }
-    statements.add(new jsAst.Return(receiver[target](arguments)));
+    statements.add(
+        js.statement('return #.#(#)', [receiver, target, arguments]));
 
     return statements;
   }
@@ -477,17 +477,13 @@ class NativeEmitter {
     // If we have any properties to add to Object.prototype, we run
     // through them and add them using defineProperty.
     if (!objectProperties.isEmpty) {
-      jsAst.Expression init =
-          js.fun(['table'],
-              new jsAst.ForIn(
-                  new jsAst.VariableDeclarationList(
-                      [new jsAst.VariableInitialization(
-                          new jsAst.VariableDeclaration('key'),
-                          null)]),
-                  js('table'),
-                  new jsAst.ExpressionStatement(
-                      js('$defPropName(Object.prototype, key, table[key])'))))(
-              new jsAst.ObjectInitializer(objectProperties));
+      jsAst.Expression init = js(r'''
+          (function(table) {
+            for(var key in table)
+              #(Object.prototype, key, table[key]);
+           })(#)''',
+          [ defPropFunction,
+            new jsAst.ObjectInitializer(objectProperties)]);
 
       if (emitter.compiler.enableMinification) targetBuffer.add(';');
       targetBuffer.add(jsAst.prettyPrint(