Changes in smoke in preparation of polymer's codegen:

pkg/smoke/lib/src/common.dart

 // Copyright (c) 2014, 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.
 
 /// Some common utilities used by other libraries in this package.
 library smoke.src.common;
 
 import 'package:smoke/smoke.dart' as smoke show isSubclassOf;
 
 /// Returns [input] adjusted to be within [min] and [max] length. Truncating it
@@ skipping 59 matching lines @@
 /// mandatory arguments, this function returns `-1`, but if the funtion takes
 /// `2` mandatory arguments and 10 optional arguments, this function returns
 /// `3`.
 int maxArgs(Function f) {
   if (f is _Func3) return 3;
   if (f is _Func2) return 2;
   if (f is _Func1) return 1;
   if (f is _Func0) return 0;
   return -1;
 }
+
+/// Shallow comparison of two lists.
+bool compareLists(List a, List b, {bool unordered: false}) {
+  if (a == null && b != null) return false;
+  if (a != null && b == null) return false;
+  if (a.length != b.length) return false;
+  if (unordered) {
+    var bSet = new Set()..addAll(b);
+    for (int i = 0; i < a.length; i++) {
+      if (!bSet.contains(a[i])) return false;
+    }
+  } else {
+    for (int i = 0; i < a.length; i++) {
+      if (a[i] != b[i]) return false;
+    }
+  }
+  return true;
+}
+
+/// Shallow comparison of two maps.
+bool compareMaps(Map a, Map b) {
+  if (a == null && b != null) return false;
+  if (a != null && b == null) return false;
+  if (a.length != b.length) return false;
+  for (var k in a.keys) {
+    if (!b.containsKey(k) || a[k] != b[k]) return false;
+  }
+  return true;
+}