Declare the sequence of phases for the full polymer transform and add tests for

pkg/polymer/lib/src/transform/script_compactor.dart

 // 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.
 
 /** Transfomer that combines multiple dart script tags into a single one. */
 library polymer.src.transform.script_compactor;
 
 import 'dart:async';
 
 import 'package:barback/barback.dart';
@@ skipping 20 matching lines @@
   Future<bool> isPrimary(Asset input) =>
       new Future.value(input.id.extension == ".html");
 
   Future apply(Transform transform) {
     var id = transform.primaryId;
     var logger = transform.logger;
     return getPrimaryContent(transform).then((content) {
       var document = parseHtml(content, id.path, logger);
       var libraries = [];
       bool changed = false;
+      var dartLoaderTag = null;
       for (var tag in document.queryAll('script')) {
+        var src = tag.attributes['src'];
+        if (src != null) {
+          if (src == 'packages/polymer/boot.js') {
+            tag.remove();
+            continue;
+          }
+          var last = src.split('/').last;
+          if (last == 'dart.js' || last == 'testing.js') {
+            dartLoaderTag = tag;
+          }
+        }
         if (tag.attributes['type'] != 'application/dart') continue;
         tag.remove();
         changed = true;
-        var src = tag.attributes['src'];
         if (src == null) {
           logger.warning('unexpected script without a src url. The '
             'ScriptCompactor transformer should run after running the '
             'InlineCodeExtractor', tag.sourceSpan);
           continue;
         }
         var libraryId = resolve(id, src, logger, tag.sourceSpan);
 
         // TODO(sigmund): should we detect/remove duplicates?
         if (libraryId == null) continue;
         libraries.add(libraryId);
       }
 
       if (!changed) {
         transform.addOutput(new Asset.fromString(id, content));
         return;
       }
 
       var bootstrapId = id.addExtension('_bootstrap.dart');
       var filename = path.url.basename(bootstrapId.path);
-      document.body.nodes.add(parseFragment(
-            '<script type="application/dart" src="$filename"></script>'));
+
+      var bootstrapScript = parseFragment(
+            '<script type="application/dart" src="$filename"></script>');
+      if (dartLoaderTag == null) {
+        document.body.nodes.add(bootstrapScript);
+        document.body.nodes.add(parseFragment('<script type="text/javascript" '
+            'src="packages/browser/dart.js"></script>'));
+      } else if (dartLoaderTag.parent != document.body) {
+        document.body.nodes.add(bootstrapScript);
+      } else {
+        document.body.insertBefore(bootstrapScript, dartLoaderTag);
+      }
 
       var urls = libraries.map((id) => importUrlFor(id, bootstrapId, logger))
           .where((url) => url != null).toList();
       var buffer = new StringBuffer()..write(_header);
       for (int i = 0; i < urls.length; i++) {
         buffer.writeln("import '${urls[i]}' as i$i;");
       }
       buffer..write(_mainPrefix)
           ..writeAll(urls.map((url) => "      '$url',\n"))
           ..write(_mainSuffix);
@@ skipping 12 matching lines @@
     if (id.path.startsWith('lib/')) {
       return 'package:${id.package}/${id.path.substring(4)}';
     }
     
     // Use relative urls only if it's possible.
     if (id.package != sourceId.package) {
       logger.error("don't know how to import $id from $sourceId");
       return null;
     }
 
-    var urlBuilder = path.url;
-    var upPath = urlBuilder.joinAll(
-        urlBuilder.split(sourceId.path).map((_) => '..'));
-    return urlBuilder.normalize(
-        urlBuilder.join(sourceId.path, upPath, id.path));
+    var builder = path.url;
+    return builder.relative(builder.join('/', id.path),
+        from: builder.join('/', builder.dirname(sourceId.path)));
   }
 }
 
 const _header = """
 library app_bootstrap;
 
 import 'package:polymer/polymer.dart';
 import 'dart:mirrors' show currentMirrorSystem;
 
 """;
 
 const _mainPrefix = """
 
 void main() {
   initPolymer([
 """;
 
 // TODO(sigmund): investigate alternative to get the baseUri (dartbug.com/12612)
 const _mainSuffix = """
     ], currentMirrorSystem().isolate.rootLibrary.uri.toString());
 }
 """;