Implement minified MirrorSystem.getName.

dart/sdk/lib/_internal/lib/js_names.dart

+// 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 dart._js_names;
+
+import 'dart:_foreign_helper' show JS;
+
+/// No-op method that is called to inform the compiler that unmangled
+/// named must be preserved.
+preserveNames() {}
+
+final Map<String, String> mangledNames = computeMangledNames();
+
+final Map<String, String> reflectiveNames = computeReflectiveNames();
+
+Map<String, String> computeMangledNames() {
+  preserveNames();
+  var mangledNames = JS('', 'init.mangledNames');
+  var keys = extractKeys(mangledNames);
+  var result = <String, String>{};
+  for (String key in keys) {
+    result[key] = JS('String', '#[#]', mangledNames, key);
+  }
+  return result;
+}
+
+Map<String, String> computeReflectiveNames() {
+  preserveNames();
+  var result = <String, String>{};
+  mangledNames.forEach((String mangledName, String reflectiveName) {
+      result[reflectiveName] = mangledName;

[kasperl, 2013/06/19 09:19:50]

Weird indentation.

[ahe, 2013/06/19 12:20:59]

Done.

+    });
+  return result;
+}
+
+List extractKeys(victim) {
+  return JS('List', '''
+(function(victim, hasOwnProperty) {
+  var result = [];
+  for (var key in victim) {
+    if (hasOwnProperty.call(victim, key)) result.push(key);
+  }
+  return result;
+})(#, Object.prototype.hasOwnProperty)''', victim);
+}