fix(bootstrap): fix expressions containing bootstrap (fixes #3309)

Author: yjbanov

modules/angular2/src/core/application_static.dart

@@ -7,6 +7,9 @@ import 'application_common.dart';
 ///
 /// See [commonBootstrap] for detailed documentation.
 Future<ApplicationRef> bootstrapStatic(Type appComponentType,
-    [List componentInjectableBindings]) {
+    [List componentInjectableBindings, void initReflector()]) {
+  if (initReflector != null) {
+    initReflector();
+  }
   return commonBootstrap(appComponentType, componentInjectableBindings);
 }

modules/angular2/src/transform/reflection_remover/rewriter.dart

@@ -124,21 +124,38 @@ class _RewriterVisitor extends Object with RecursiveAstVisitor<Object> {
   _rewriteBootstrapCallToStatic(MethodInvocation node) {
     if (_rewriter._writeStaticInit) {
       buf.write(_rewriter._code.substring(_currentIndex, node.offset));
-      _writeStaticReflectorInitOnce();
+
+      var args = node.argumentList.arguments;
+      int numArgs = node.argumentList.arguments.length;
+      if (numArgs < 1 || numArgs > 2) {
+        logger.warning('`bootstrap` does not support $numArgs arguments. Found bootstrap${node.argumentList}. Transform may not succeed.');
+      }
+
+      var reflectorInit = _setupAdded
+          ? ''
+          : ', () { ${_getStaticReflectorInitBlock()} }';
+
       // rewrite `bootstrap(...)` to `bootstrapStatic(...)`
-      buf.write('bootstrapStatic${node.argumentList}');
+      buf.write('bootstrapStatic(');
+      buf.write(args[0]);
+      if (numArgs == 1) {
+        if (reflectorInit.isNotEmpty) {
+          buf.write(', null');
+        }
+      } else {
+        buf.write(', ${args[1]}');
+      }
+      buf.write(reflectorInit);
+      buf.write(')');
     } else {
       // leave it as is
       buf.write(_rewriter._code.substring(_currentIndex, node.end));
     }
     _currentIndex = node.end;
   }
 
-  _writeStaticReflectorInitOnce() {
-    if (!_setupAdded) {
-      buf.write(_rewriter._codegen.codegenSetupReflectionCall());
-      _setupAdded = true;
-    }
+  String _getStaticReflectorInitBlock() {
+    return _rewriter._codegen.codegenSetupReflectionCall();
   }
 
   _rewriteReflectionCapabilitiesImport(ImportDirective node) {
@@ -162,8 +179,9 @@ class _RewriterVisitor extends Object with RecursiveAstVisitor<Object> {
       node = node.parent;
     }
     buf.write(_rewriter._code.substring(_currentIndex, node.offset));
-    if (_rewriter._writeStaticInit) {
-      _writeStaticReflectorInitOnce();
+    if (_rewriter._writeStaticInit && !_setupAdded) {
+      buf.write(_getStaticReflectorInitBlock());
+      _setupAdded = true;
     }
     switch (_rewriter._mirrorMode) {
       case MirrorMode.debug:

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

@@ -10,13 +10,15 @@ import 'reflection_remover_files/expected/index.dart' as expected;
 import 'debug_mirrors_files/expected/index.dart' as debug_mirrors;
 import 'log_mirrors_files/expected/index.dart' as log_mirrors;
 import 'verbose_files/expected/index.dart' as verbose_mirrors;
+import 'bootstrap_files/expected/index.dart' as bootstrap_expected;
 import '../common/read_file.dart';
 
 main() => allTests();
 
 void allTests() {
   var codegen = new Codegen('web/index.dart', ['web/index.ng_deps.dart']);
   var code = readFile('reflection_remover/index.dart').replaceAll('\r\n', '\n');
+  var bootstrapCode = readFile('reflection_remover/bootstrap_files/index.dart').replaceAll('\r\n', '\n');
 
   it('should remove uses of mirrors & '
       'insert calls to generated code by default.', () {
@@ -45,4 +47,10 @@ void allTests() {
         .rewrite(parseCompilationUnit(code));
     expect(output).toEqual(log_mirrors.code);
   });
+
+  it('should rewrite bootstrap.', () {
+    var output = new Rewriter(bootstrapCode, codegen, writeStaticInit: true)
+        .rewrite(parseCompilationUnit(bootstrapCode));
+    expect(output).toEqual(bootstrap_expected.code);
+  });
 }

modules/angular2/test/transform/reflection_remover/bootstrap_files/README.md

@@ -0,0 +1,5 @@
+Tests that the reflection removal step:
+ 1. Comments out reflective `bootstrap.dart` import
+ 1. Adds `bootstrap_static.dart` import
+ 1. Adds the call to `initReflector`
+ 1. Handles bootstrap return values properly

modules/angular2/test/transform/reflection_remover/bootstrap_files/expected/index.dart

@@ -0,0 +1,19 @@
+library angular2.test.transform.reflection_remover.reflection_remover_files;
+
+// This file is intentionally formatted as a string to avoid having the
+// automatic transformer prettify it.
+//
+// This file represents transformed user code. Because this code will be
+// linked to output by a source map, we cannot change line numbers from the
+// original code and we therefore add our generated code on the same line as
+// those we are removing.
+
+var code = """
+library web_foo;
+
+import 'package:angular2/bootstrap_static.dart';import 'index.ng_deps.dart' as ngStaticInit0;
+
+void main() async {
+  var appRef = await bootstrapStatic(MyComponent, null, () { ngStaticInit0.initReflector(); });
+}
+""";

modules/angular2/test/transform/reflection_remover/bootstrap_files/index.dart

@@ -0,0 +1,7 @@
+library web_foo;
+
+import 'package:angular2/bootstrap.dart';
+
+void main() async {
+  var appRef = await bootstrap(MyComponent);
+}