Support self-referential package: imports with Pub.

utils/pub/package.dart

 // Copyright (c) 2012, 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('package');
 
 #import('io.dart');
 #import('pubspec.dart');
 #import('source.dart');
 #import('source_registry.dart');
@@ skipping 25 matching lines @@
   }
 
   /**
    * The path to the directory containing the package.
    */
   final String dir;
 
   /**
    * The name of the package.
    */
-  final String name;
+  String get name() {
+    if (pubspec.name != null) return pubspec.name;
+    if (dir != null) return basename(dir);
+    return null;
+  }
 
   /**
    * The package's version.
    */
   Version get version => pubspec.version;
 
   /**
    * The parsed pubspec associated with this package.
    */
   final Pubspec pubspec;
 
   /**
    * The ids of the packages that this package depends on. This is what is
    * specified in the pubspec when this package depends on another.
    */
   Collection<PackageRef> get dependencies => pubspec.dependencies;
 
   /**
-   * Constructs a package with the given name and pubspec. The package will
-   * no directory associated with it.
+   * Constructs a package with the given pubspec. The package will have no
+   * directory associated with it.
    */
-  Package.inMemory(this.name, this.pubspec)
+  Package.inMemory(this.pubspec)
     : dir = null;
 
   /**
    * Constructs a package. This should not be called directly. Instead, acquire
    * packages from [load()].
    */
-  Package._(String dir, this.pubspec)
-    : dir = dir,
-      name = basename(dir);
+  Package._(this.dir, this.pubspec);
 
   /**
    * Returns a debug string for the package.
    */
   String toString() => '$name $version ($dir)';
 }
 
 /**
  * An unambiguous resolved reference to a package. A package ID contains enough
  * information to correctly install the package.
@@ skipping 100 matching lines @@
 
   String toString() => "$name $constraint from $source ($description)";
 
   /**
    * Returns a [PackageId] generated from this [PackageRef] with the given
    * concrete version.
    */
   PackageId atVersion(Version version) =>
     new PackageId(source, version, description);
 }