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

pkg/polymer/lib/src/transform/import_inliner.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 inlines polymer-element definitions from html imports. */
-library polymer.src.transform.import_inliner;
-
-import 'dart:async';
-
-import 'package:barback/barback.dart';
-import 'package:path/path.dart' as path;
-import 'package:html5lib/dom.dart' show Document, Node, DocumentFragment;
-import 'package:html5lib/dom_parsing.dart' show TreeVisitor;
-import 'common.dart';
-
-/** Recursively inlines polymer-element definitions from html imports. */
-// TODO(sigmund): make sure we match semantics of html-imports for tags other
-// than polymer-element (see dartbug.com/12613).
-class ImportedElementInliner extends Transformer with PolymerTransformer {
-  final TransformOptions options;
-
-  ImportedElementInliner(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 seen = new Set<AssetId>();
-    var elements = [];
-    var id = transform.primaryInput.id;
-    seen.add(id);
-    return readPrimaryAsHtml(transform).then((document) {
-      var future = _visitImports(document, id, transform, seen, elements);
-      return future.then((importsFound) {
-        if (!importsFound) {
-          transform.addOutput(transform.primaryInput);
-          return;
-        }
-
-        for (var tag in document.queryAll('link')) {
-          if (tag.attributes['rel'] == 'import') {
-            tag.remove();
-          }
-        }
-        var fragment = new DocumentFragment()..nodes.addAll(elements);
-        document.body.insertBefore(fragment,
-            //TODO(jmesserly): add Node.firstChild to html5lib
-            document.body.nodes.length == 0 ? null : document.body.nodes[0]);
-        transform.addOutput(new Asset.fromString(id, document.outerHtml));
-      });
-    });
-  }
-
-  /**
-   * Visits imports in [document] and add their polymer-element definitions to
-   * [elements], unless they have already been [seen]. Elements are added in the
-   * order they appear, transitive imports are added first.
-   */
-  Future<bool> _visitImports(Document document, AssetId sourceId,
-      Transform transform, Set<AssetId> seen, List<Node> elements) {
-    var importIds = [];
-    bool hasImports = false;
-    for (var tag in document.queryAll('link')) {
-      if (tag.attributes['rel'] != 'import') continue;
-      var href = tag.attributes['href'];
-      var id = resolve(sourceId, href, transform.logger, tag.sourceSpan);
-      hasImports = true;
-      if (id == null || seen.contains(id)) continue;
-      importIds.add(id);
-    }
-
-    if (importIds.isEmpty) return new Future.value(hasImports);
-
-    // Note: we need to preserve the import order in the generated output.
-    return Future.forEach(importIds, (id) {
-      if (seen.contains(id)) return new Future.value(null);
-      seen.add(id);
-      return _collectPolymerElements(id, transform, seen, elements);
-    }).then((_) => true);
-  }
-
-  /**
-   * Loads an asset identified by [id], visits its imports and collects it's
-   * polymer-element definitions.
-   */
-  Future _collectPolymerElements(AssetId id, Transform transform,
-      Set<AssetId> seen, List elements) {
-    return readAsHtml(id, transform).then((document) {
-      return _visitImports(document, id, transform, seen, elements).then((_) {
-        var normalizer = new _UrlNormalizer(transform, id);
-        for (var element in document.queryAll('polymer-element')) {
-          normalizer.visit(document);
-          elements.add(element);
-        }
-      });
-    });
-  }
-}
-
-/** Internally adjusts urls in the html that we are about to inline. */
-class _UrlNormalizer extends TreeVisitor {
-  final Transform transform;
-
-  /** Asset where the original content (and original url) was found. */
-  final AssetId sourceId;
-
-  _UrlNormalizer(this.transform, this.sourceId);
-
-  visitElement(Element node) {
-    for (var key in node.attributes.keys) {
-      if (_urlAttributes.contains(key)) {
-        var url = node.attributes[key];
-        if (url != null && url != '') {
-          node.attributes[key] = _newUrl(url, node.sourceSpan);
-        }
-      }
-    }
-    super.visitElement(node);
-  }
-
-  _newUrl(String href, Span span) {
-    var uri = Uri.parse(href);
-    if (uri.isAbsolute) return href;
-    if (!uri.scheme.isEmpty) return href;
-    if (!uri.host.isEmpty) return href;
-    if (uri.path.isEmpty) return href;  // Implies standalone ? or # in URI.
-    if (path.isAbsolute(href)) return href;
-
-    var id = resolve(sourceId, href, transform.logger, span);
-    var primaryId = transform.primaryInput.id;
-
-    if (id.path.startsWith('lib/')) {
-      return 'packages/${id.package}/${id.path.substring(4)}';
-    }
-
-    if (id.path.startsWith('asset/')) {
-      return 'assets/${id.package}/${id.path.substring(6)}';
-    }
-
-    if (primaryId.package != id.package) {
-      // Techincally we shouldn't get there
-      logger.error("don't know how to include $id from $primaryId", span);
-      return null;
-    }
-    
-    var builder = path.url;
-    return builder.relative(builder.join('/', id.path),
-        from: builder.join('/', builder.dirname(primaryId.path)));
-  }
-}
-
-/**
- * HTML attributes that expect a URL value.
- * <http://dev.w3.org/html5/spec/section-index.html#attributes-1>
- *
- * Every one of these attributes is a URL in every context where it is used in
- * the DOM. The comments show every DOM element where an attribute can be used.
- */
-const _urlAttributes = const [
-  'action',     // in form
-  'background', // in body
-  'cite',       // in blockquote, del, ins, q
-  'data',       // in object
-  'formaction', // in button, input
-  'href',       // in a, area, link, base, command
-  'icon',       // in command
-  'manifest',   // in html
-  'poster',     // in video
-  'src',        // in audio, embed, iframe, img, input, script, source, track,
-                //    video
-];