fix bug in scriptcompactors bootstrap and added transform function which can be used by other trans…

lib/build/script_compactor.dart

 // Copyright (c) 2015, 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 web_components.build.script_compactor;
 
 import 'dart:async';
 import 'package:analyzer/analyzer.dart';
 import 'package:barback/barback.dart';
 import 'package:code_transformers/assets.dart';
 import 'package:code_transformers/messages/build_logger.dart';
@@ skipping 101 matching lines @@
     buffer.writeln();
     var i = 0;
     for (var script in importScripts) {
       var path = _importPath(script, primaryInput);
       buffer.writeln("import '$path' as i$i;");
       i++;
     }
     var mainScriptPath = _importPath(mainScript, primaryInput);
     buffer.writeln("import '$mainScriptPath' as i$i;");
     buffer.writeln();
-    buffer.writeln('void main() => i$i.main();');
+    buffer.writeln('void main() { i$i.main(); }');

[Siggi Cherem (dart-lang), 2015/02/23 18:15:16]

since this is not formatted automatically, maybe add the new-lines? not sure
this matters much though. I'm ok keeping it as it is.

Another option would be to remove the `void` return type :)

[jakemac, 2015/02/23 18:19:16]

I am inclined to just leave it, this fits on one line and I like supplying the
void :)

 
     var bootstrap = new Asset.fromString(bootstrapId, '$buffer');
     transform.addOutput(bootstrap);
     return bootstrap;
   }
 
   /// Split inline scripts into their own files. We need to do this for dart2js
   /// to be able to compile them.
   ///
   /// This also validates that there weren't any duplicate scripts.
@@ skipping 119 matching lines @@
   if (parts[0] == 'lib') {
     parts[0] = id.package;
     return 'package:${path.url.joinAll(parts)}';
   }
   return path.url.relative(id.path, from: path.url.dirname(primaryInput.path));
 }
 
 // Constant and final variables
 final _invalidLibCharsRegex = new RegExp('[^a-z0-9_]');
 final _numRegex = new RegExp('[0-9]');