move fancy_syntax into Dart SVN

pkg/polymer_expressions/lib/src/mirrors.dart

Index: pkg/polymer_expressions/lib/src/mirrors.dart
diff --git a/pkg/polymer_expressions/lib/src/mirrors.dart b/pkg/polymer_expressions/lib/src/mirrors.dart
new file mode 100644
index 0000000000000000000000000000000000000000..c2a6c471068bc85ad3050cb5869c808d6e9c65b3
--- /dev/null
+++ b/pkg/polymer_expressions/lib/src/mirrors.dart
@@ -0,0 +1,42 @@
+// 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 polymer_expressions.mirrors;
+
+import 'dart:mirrors';
+
+/**
+ * Walks up the class hierarchy to find a method declaration with the given
+ * [name].
+ *
+ * Note that it's not possible to tell if there's an implementation via
+ * noSuchMethod().
+ */
+Mirror getMemberMirror(ClassMirror classMirror, Symbol name) {
+  if (classMirror.members.containsKey(name)) {
+    return classMirror.members[name];
+  }
+  if (hasSuperclass(classMirror)) {
+    var mirror = getMemberMirror(classMirror.superclass, name);
+    if (mirror != null) {
+      return mirror;
+    }
+  }
+  for (ClassMirror supe in classMirror.superinterfaces) {
+    var mirror = getMemberMirror(supe, name);
+    if (mirror != null) {
+      return mirror;
+    }
+  }
+  return null;
+}
+
+/**
+ * Work-around for http://dartbug.com/5794
+ */
+bool hasSuperclass(ClassMirror classMirror) {
+  var superclass = classMirror.superclass;
+  return (superclass != null) &&
+      (superclass.qualifiedName != const Symbol('dart.core.Object'));
+}