Rearranges the polymer package now that the old compiler is gone.

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';
-import 'package:html5lib/parser.dart' show parseFragment;
-import 'package:path/path.dart' as path;
-
-import 'code_extractor.dart'; // import just for documentation.
-import 'common.dart';
-
-/**
- * Combines Dart script tags into a single script tag, and creates a new Dart
- * file that calls the main function of each of the original script tags.
- *
- * This transformer assumes that all script tags point to external files. To
- * support script tags with inlined code, use this transformer after running
- * [InlineCodeExtractor] on an earlier phase.
- *
- * Internally, this transformer will convert each script tag into an import
- * statement to a library, and then uses `initPolymer` (see polymer.dart)  to
- * invoke the main method on each of these libraries and register any polymer
- * elements annotated with `@CustomTag`.
- */
-class ScriptCompactor extends Transformer with PolymerTransformer {
-  final TransformOptions options;
-
-  ScriptCompactor(this.options);
-
-  /** Only run on entry point .html files. */
-  Future<bool> isPrimary(Asset input) =>
-      new Future.value(options.isHtmlEntryPoint(input.id));
-
-  Future apply(Transform transform) {
-    var id = transform.primaryInput.id;
-    var logger = transform.logger;
-    return readPrimaryAsHtml(transform).then((document) {
-      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') {
-            dartLoaderTag = tag;
-          }
-        }
-        if (tag.attributes['type'] != 'application/dart') continue;
-        tag.remove();
-        changed = true;
-        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(transform.primaryInput);
-        return;
-      }
-
-      var bootstrapId = id.addExtension('_bootstrap.dart');
-      var filename = path.url.basename(bootstrapId.path);
-
-      var bootstrapScript = parseFragment(
-            '<script type="application/dart" src="$filename"></script>');
-      if (dartLoaderTag == null) {
-        document.body.nodes.add(bootstrapScript);
-        document.body.nodes.add(parseFragment(
-            '<script src="packages/browser/dart.js"></script>'));
-      } else if (dartLoaderTag.parent != document.body) {
-        document.body.nodes.add(bootstrapScript);
-      } else {
-        document.body.insertBefore(bootstrapScript, dartLoaderTag);
-      }
-
-      var urls = libraries.map((id) => assetUrlFor(id, bootstrapId, logger))
-          .where((url) => url != null).toList();
-      var buffer = new StringBuffer()..write(_header);
-      for (int i = 0; i < urls.length; i++) {
-        buffer.writeln("import '${urls[i]}' as i$i;");
-      }
-      buffer..write(_mainPrefix)
-          ..writeAll(urls.map((url) => "      '$url',\n"))
-          ..write(_mainSuffix);
-
-      transform.addOutput(new Asset.fromString(bootstrapId, buffer.toString()));
-      transform.addOutput(new Asset.fromString(id, document.outerHtml));
-    });
-  }
-}
-
-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());
-}
-""";