Support self-referential package: imports with Pub.

utils/pub/pubspec.dart

Index: utils/pub/pubspec.dart
diff --git a/utils/pub/pubspec.dart b/utils/pub/pubspec.dart
index e18b89b1439e994a3d23c839c1e803c6053cd292..2b82a71acb76f4da67a83adda9a3d9865fbb724c 100644
--- a/utils/pub/pubspec.dart
+++ b/utils/pub/pubspec.dart
@@ -16,6 +16,11 @@
  */
 class Pubspec {
   /**
+   * This package's name.
+   */
+  final String name;
+
+  /**
    * This package's version.
    */
   final Version version;
@@ -25,17 +30,23 @@ class Pubspec {
    */
   List<PackageRef> dependencies;
 
-  Pubspec(this.version, this.dependencies);
+  Pubspec(this.name, this.version, this.dependencies);
 
   Pubspec.empty()
-    : version = Version.none,
+    : name = null,
+      version = Version.none,
       dependencies = <PackageRef>[];
 
+  /** Whether or not the pubspec has no contents. */
+  bool get isEmpty() =>
+    name == null && version == Version.none && dependencies.isEmpty();
+
   /**
    * Parses the pubspec whose text is [contents]. If the pubspec doesn't define
    * version for itself, it defaults to [Version.none].
    */
   factory Pubspec.parse(String contents, SourceRegistry sources) {
+    var name = null;
     var version = Version.none;
     var dependencies = <PackageRef>[];
 
@@ -48,6 +59,8 @@ class Pubspec {
       throw new FormatException('The pubspec must be a YAML mapping.');
     }
 
+    if (parsedPubspec.containsKey('name')) name = parsedPubspec['name'];
+
     if (parsedPubspec.containsKey('version')) {
       version = new Version.parse(parsedPubspec['version']);
     }
@@ -102,6 +115,6 @@ class Pubspec {
       });
     }
 
-    return new Pubspec(version, dependencies);
+    return new Pubspec(name, version, dependencies);
   }
 }