Use YAML as the format for the pubspec file.

utils/pub/package.dart

Index: utils/pub/package.dart
diff --git a/utils/pub/package.dart b/utils/pub/package.dart
index 0b1bcfa2d36dc32c3e19cc34e396f4a8df3ffec1..79ddd52001590e620e27dd7a4bf2d40307b3a0e6 100644
--- a/utils/pub/package.dart
+++ b/utils/pub/package.dart
@@ -113,13 +113,13 @@ class Package implements Hashable {
     });
 
     readFuture.then((pubspec) {
-      // TODO(rnystrom): Use YAML parser when ready. For now, it's just a flat
-      // list of newline-separated strings.
-      final dependencyNames = pubspec.split('\n').
-          map((name) => name.trim()).
-          filter((name) => (name != null) && (name != ''));
+      var parsedPubspec = loadYaml(pubspec);
+      if (parsedPubspec is! List || parsedPubspec.some((e) => e is! String)) {
+        completer.completeException(
+            'pubspec must be a YAML list of package names.');

[Bob Nystrom, 2012/04/25 22:59:01]

'The pubspec...

just so it can be sentence cased.

[nweiz, 2012/04/25 23:05:14]

Done.

+      }
 
-      completer.complete(dependencyNames);
+      completer.complete(parsedPubspec);
     });
 
     return completer.future;