Roll Observatory packages and add a roll script

polymer/lib/src/build/polymer_smoke_generator.dart

Index: polymer/lib/src/build/polymer_smoke_generator.dart
diff --git a/polymer/lib/src/build/polymer_smoke_generator.dart b/polymer/lib/src/build/polymer_smoke_generator.dart
deleted file mode 100644
index 11664f62f651370552e4d6bffbbf4f1fdd37ffb3..0000000000000000000000000000000000000000
--- a/polymer/lib/src/build/polymer_smoke_generator.dart
+++ /dev/null
@@ -1,736 +0,0 @@
-// 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.build.polymer_smoke_generator;
-
-import 'dart:async';
-
-import 'package:html/dom.dart' show Document, Element, Text;
-import 'package:html/dom_parsing.dart';
-import 'package:html/parser.dart' show parseFragment;
-import 'package:analyzer/src/generated/ast.dart';
-import 'package:analyzer/src/generated/element.dart' hide Element;
-import 'package:analyzer/src/generated/element.dart' as analyzer show Element;
-import 'package:barback/barback.dart';
-import 'package:code_transformers/messages/build_logger.dart';
-import 'package:code_transformers/assets.dart';
-import 'package:code_transformers/src/dart_sdk.dart' as dart_sdk;
-import 'package:path/path.dart' as path;
-import 'package:source_span/source_span.dart';
-import 'package:smoke/codegen/generator.dart';
-import 'package:smoke/codegen/recorder.dart';
-import 'package:code_transformers/resolver.dart';
-import 'package:template_binding/src/mustache_tokens.dart' show MustacheTokens;
-
-import 'package:polymer_expressions/expression.dart' as pe;
-import 'package:polymer_expressions/parser.dart' as pe;
-import 'package:polymer_expressions/visitor.dart' as pe;
-
-import 'package:web_components/build/import_crawler.dart';
-
-import 'common.dart';
-import 'messages.dart';
-
-/// Method to generate a bootstrap file for Polymer given a [Transform] and a
-/// [Resolver]. This can be used inside any transformer to share the [Resolver]
-/// with other steps.
-Future<Asset> generatePolymerBootstrap(Transform transform, Resolver resolver,
-    AssetId entryPointId, AssetId bootstrapId, Document document,
-    TransformOptions options, {AssetId resolveFromId}) {
-  return new PolymerSmokeGenerator(
-      transform, resolver, entryPointId, bootstrapId, document, options,
-      resolveFromId: resolveFromId).apply();
-}
-
-class PolymerSmokeGeneratorTransformer extends Transformer
-    with PolymerTransformer {
-  final Resolvers resolvers;
-  final TransformOptions options;
-
-  PolymerSmokeGeneratorTransformer(this.options, {String sdkDir})
-      // TODO(sigmund): consider restoring here a resolver that uses the real
-      // SDK once the analyzer is lazy and only an resolves what it needs:
-      //: resolvers = new Resolvers(sdkDir != null ? sdkDir : dartSdkDirectory);
-      : resolvers = new Resolvers.fromMock(dart_sdk.mockSdkSources);
-
-  /// Only run on entry point .html files.
-  bool isPrimary(AssetId id) => options.isHtmlEntryPoint(id);
-
-  Future apply(Transform transform) {
-    var logger = new BuildLogger(transform,
-        convertErrorsToWarnings: !options.releaseMode,
-        detailsUri: 'http://goo.gl/5HPeuP');
-    var primaryId = transform.primaryInput.id;
-    return readPrimaryAsHtml(transform, logger).then((document) {
-      var script = document.querySelector('script[type="application/dart"]');
-      if (script == null) return null;
-      var entryScriptId = uriToAssetId(
-          primaryId, script.attributes['src'], logger, script.sourceSpan);
-      var bootstrapId = primaryId.addExtension('_bootstrap.dart');
-      script.attributes['src'] = path.basename(bootstrapId.path);
-
-      return resolvers.get(transform, [entryScriptId]).then((resolver) {
-        return generatePolymerBootstrap(transform, resolver, entryScriptId,
-            bootstrapId, document, options).then((bootstrapAsset) {
-          transform.addOutput(bootstrapAsset);
-          transform
-              .addOutput(new Asset.fromString(primaryId, document.outerHtml));
-          resolver.release();
-        });
-      });
-    });
-  }
-}
-
-/// Class which generates the static smoke configuration for polymer.
-// TODO(jakemac): Investigate further turning this into an [InitializerPlugin].
-// The main difficulty is this actually recognizes any class which extends the
-// [PolymerElement] class, not just things annotated with [CustomTag].
-class PolymerSmokeGenerator {
-  final TransformOptions options;
-  final Transform transform;
-  final BuildLogger logger;
-  final AssetId docId;
-  final AssetId bootstrapId;
-
-  /// Id of the Dart script found in the document (can only be one).
-  AssetId entryScriptId;
-
-  /// Id of the Dart script to start resolution from.
-  AssetId resolveFromId;
-
-  /// HTML document parsed from [docId].
-  Document document;
-
-  /// Attributes published on a custom-tag. We make these available via
-  /// reflection even if @published was not used.
-  final Map<String, List<String>> publishedAttributes = {};
-
-  /// Resolved types used for analyzing the user's sources and generating code.
-  _ResolvedTypes types;
-
-  /// The resolver instance associated with a single run of this transformer.
-  Resolver resolver;
-
-  /// Code generator used to create the static initialization for smoke.
-  final generator = new SmokeCodeGenerator();
-
-  _SubExpressionVisitor expressionVisitor;
-
-  PolymerSmokeGenerator(Transform transform, Resolver resolver,
-      this.entryScriptId, this.bootstrapId, this.document, options,
-      {this.resolveFromId})
-      : transform = transform,
-        options = options,
-        logger = new BuildLogger(transform,
-            convertErrorsToWarnings: !options.releaseMode,
-            detailsUri: 'http://goo.gl/5HPeuP'),
-        docId = transform.primaryInput.id,
-        resolver = resolver {
-    _ResolvedTypes.logger = logger;
-    types = new _ResolvedTypes(resolver);
-    if (resolveFromId == null) resolveFromId = entryScriptId;
-  }
-
-  Future<Asset> apply() {
-    return _extractUsesOfMirrors().then((_) {
-      var bootstrapAsset = _buildBootstrap();
-      _modifyDocument();
-
-      // Write out the logs collected by our [BuildLogger].
-      if (options.injectBuildLogsInOutput) {
-        return logger.writeOutput().then((_) => bootstrapAsset);
-      }
-      return bootstrapAsset;
-    });
-  }
-
-  /// Inspects the entire program to find out anything that polymer accesses
-  /// using mirrors and produces static information that can be used to replace
-  /// the mirror-based loader and the uses of mirrors through the `smoke`
-  /// package. This includes:
-  ///
-  ///   * visiting polymer-expressions to extract getters and setters,
-  ///   * looking for published fields of custom elements, and
-  ///   * looking for event handlers and callbacks of change notifications.
-  ///
-  Future _extractUsesOfMirrors() {
-    // Generate getters and setters needed to evaluate polymer expressions, and
-    // extract information about published attributes.
-    expressionVisitor = new _SubExpressionVisitor(generator, logger);
-
-    return new ImportCrawler(transform, transform.primaryInput.id, logger,
-        primaryDocument: document).crawlImports().then((documentData) {
-      for (var data in documentData.values) {
-        new _HtmlExtractor(
-                logger, generator, publishedAttributes, expressionVisitor)
-            .visit(data.document);
-      }
-
-      // Create a recorder that uses analyzer data to feed data to [generator].
-      var recorder = new Recorder(generator,
-          (lib) => resolver.getImportUri(lib, from: bootstrapId).toString());
-
-      // Process all classes to include special fields and methods in custom
-      // element classes.
-      _visitLibraries(resolver.getLibrary(resolveFromId), recorder);
-    });
-  }
-
-  _visitLibraries(LibraryElement library, Recorder recorder,
-      [Set<LibraryElement> librariesSeen, Set<ClassElement> classesSeen]) {
-    if (librariesSeen == null) librariesSeen = new Set<LibraryElement>();
-    librariesSeen.add(library);
-
-    // Visit all our dependencies.
-    for (var importedLibrary in _libraryDependencies(library)) {
-      // Don't include anything from the sdk.
-      if (importedLibrary.isInSdk) continue;
-      if (librariesSeen.contains(importedLibrary)) continue;
-      _visitLibraries(importedLibrary, recorder, librariesSeen, classesSeen);
-    }
-
-    // After visiting dependencies, then visit classes in this library.
-    if (classesSeen == null) classesSeen = new Set<ClassElement>();
-    var classes = _visibleClassesOf(library);
-    for (var clazz in classes) {
-      _processClass(clazz, recorder);
-    }
-  }
-
-  Iterable<LibraryElement> _libraryDependencies(LibraryElement library) {
-    getLibrary(UriReferencedElement element) {
-      if (element is ImportElement) return element.importedLibrary;
-      if (element is ExportElement) return element.exportedLibrary;
-    }
-
-    return (new List.from(library.imports)..addAll(library.exports))
-        .map(getLibrary);
-  }
-
-  /// Process a class ([cls]). If it contains an appropriate [CustomTag]
-  /// annotation, we make sure to include everything that might be accessed or
-  /// queried from them using the smoke package. In particular, polymer uses
-  /// smoke for the following:
-  ///    * invoke #registerCallback on custom elements classes, if present.
-  ///    * query for methods ending in `*Changed`.
-  ///    * query for methods with the `@ObserveProperty` annotation.
-  ///    * query for non-final properties labeled with `@published`.
-  ///    * read declarations of properties named in the `attributes` attribute.
-  ///    * read/write the value of published properties .
-  ///    * invoke methods in event handlers.
-  _processClass(ClassElement cls, Recorder recorder) {
-    if (!_hasPolymerMixin(cls)) return;
-    if (cls.node is! ClassDeclaration) return;
-    var node = cls.node as ClassDeclaration;
-
-    // Check whether the class has a @CustomTag annotation. Typically we expect
-    // a single @CustomTag, but it's possible to have several.
-    var tagNames = [];
-    for (var meta in node.metadata) {
-      var tagName = _extractTagName(meta, cls);
-      if (tagName != null) tagNames.add(tagName);
-    }
-
-    if (cls.isPrivate && tagNames.isNotEmpty) {
-      var name = tagNames.first;
-      logger.error(PRIVATE_CUSTOM_TAG.create({'name': name, 'class': cls.name}),
-          span: _spanForNode(cls, node.name));
-      return;
-    }
-
-    // Include #registerCallback if it exists. Note that by default lookupMember
-    // and query will also add the corresponding getters and setters.
-    recorder.lookupMember(cls, 'registerCallback');
-
-    // Include methods that end with *Changed.
-    recorder.runQuery(cls, new QueryOptions(
-        includeFields: false,
-        includeProperties: false,
-        includeInherited: true,
-        includeMethods: true,
-        includeUpTo: types.htmlElementElement,
-        matches: (n) => n.endsWith('Changed') && n != 'attributeChanged'));
-
-    // Include methods marked with @ObserveProperty.
-    recorder.runQuery(cls, new QueryOptions(
-        includeFields: false,
-        includeProperties: false,
-        includeInherited: true,
-        includeMethods: true,
-        includeUpTo: types.htmlElementElement,
-        withAnnotations: [types.observePropertyElement]));
-
-    // Include @published and @observable properties.
-    // Symbols in @published are used when resolving bindings on published
-    // attributes, symbols for @observable are used via path observers when
-    // implementing *Changed an @ObserveProperty.
-    // TODO(sigmund): consider including only those symbols mentioned in
-    // *Changed and @ObserveProperty instead.
-    recorder.runQuery(cls, new QueryOptions(
-        includeUpTo: types.htmlElementElement,
-        withAnnotations: [
-      types.publishedElement,
-      types.observableElement,
-      types.computedPropertyElement
-    ]));
-
-    // Include @ComputedProperty and process their expressions
-    var computed = [];
-    recorder.runQuery(cls, new QueryOptions(
-        includeUpTo: types.htmlElementElement,
-        withAnnotations: [types.computedPropertyElement]), results: computed);
-    _processComputedExpressions(computed);
-
-    for (var tagName in tagNames) {
-      // Include also properties published via the `attributes` attribute.
-      var attrs = publishedAttributes[tagName];
-      if (attrs == null) continue;
-      for (var attr in attrs) {
-        recorder.lookupMember(cls, attr,
-            recursive: true, includeUpTo: types.htmlElementElement);
-      }
-    }
-  }
-
-  /// Determines if [cls] or a supertype has a mixin of the Polymer class.
-  bool _hasPolymerMixin(ClassElement cls) {
-    while (cls != types.htmlElementElement) {
-      for (var m in cls.mixins) {
-        if (m.element == types.polymerClassElement) return true;
-      }
-      if (cls.supertype == null) return false;
-      cls = cls.supertype.element;
-    }
-    return false;
-  }
-
-  /// If [meta] is [CustomTag], extract the name associated with the tag.
-  String _extractTagName(Annotation meta, ClassElement cls) {
-    if (meta.element != types.customTagConstructor) return null;
-    return _extractFirstAnnotationArgument(meta, 'CustomTag', cls);
-  }
-
-  /// Extract the first argument of an annotation and validate that it's type is
-  /// String. For instance, return "bar" from `@Foo("bar")`.
-  String _extractFirstAnnotationArgument(
-      Annotation meta, String name, analyzer.Element context) {
-
-    // Read argument from the AST
-    var args = meta.arguments.arguments;
-    if (args == null || args.length == 0) {
-      logger.warning(MISSING_ANNOTATION_ARGUMENT.create({'name': name}),
-          span: _spanForNode(context, meta));
-      return null;
-    }
-
-    var lib = context;
-    while (lib is! LibraryElement) lib = lib.enclosingElement;
-    var res = resolver.evaluateConstant(lib, args[0]);
-    if (!res.isValid || res.value.type != types.stringType) {
-      logger.warning(INVALID_ANNOTATION_ARGUMENT.create({'name': name}),
-          span: _spanForNode(context, args[0]));
-      return null;
-    }
-    return res.value.stringValue;
-  }
-
-  /// Process members that are annotated with `@ComputedProperty` and records
-  /// the accessors of their expressions.
-  _processComputedExpressions(List<analyzer.Element> computed) {
-    var constructor = types.computedPropertyElement.constructors.first;
-    for (var member in computed) {
-      for (var meta in member.node.metadata) {
-        if (meta.element != constructor) continue;
-        var expr =
-            _extractFirstAnnotationArgument(meta, 'ComputedProperty', member);
-        if (expr == null) continue;
-        expressionVisitor.run(pe.parse(expr), true,
-            _spanForNode(member.enclosingElement, meta.arguments.arguments[0]));
-      }
-    }
-  }
-
-  // Builds the bootstrap Dart file asset.
-  Asset _buildBootstrap() {
-    StringBuffer code = new StringBuffer()..writeln(MAIN_HEADER);
-
-    // TODO(jakemac): Inject this at some other stage.
-    // https://github.com/dart-lang/polymer-dart/issues/22
-    if (options.injectBuildLogsInOutput) {
-      code.writeln("import 'package:polymer/src/build/log_injector.dart';");
-    }
-
-    var entryScriptUrl = assetUrlFor(entryScriptId, bootstrapId, logger);
-    code.writeln("import '$entryScriptUrl' as i0;");
-
-    // Include smoke initialization.
-    generator.writeImports(code);
-    generator.writeTopLevelDeclarations(code);
-    code.writeln('\nmain() {');
-    code.write('  useGeneratedCode(');
-    generator.writeStaticConfiguration(code);
-    code.writeln(');');
-
-    // TODO(jakemac): Inject this at some other stage.
-    // https://github.com/dart-lang/polymer-dart/issues/22
-    if (options.injectBuildLogsInOutput) {
-      var buildUrl = "${path.basename(docId.path)}$LOG_EXTENSION";
-      code.writeln("  new LogInjector().injectLogsFromUrl('$buildUrl');");
-    }
-
-    code.writeln('  configureForDeployment();');
-    code.writeln('  return i0.main();');
-
-    // End of main().
-    code.writeln('}');
-    return new Asset.fromString(bootstrapId, code.toString());
-  }
-
-  // Add the styles for the logger widget.
-  // TODO(jakemac): Inject this at some other stage.
-  // https://github.com/dart-lang/polymer-dart/issues/22
-  void _modifyDocument() {
-    if (options.injectBuildLogsInOutput) {
-      document.head.append(parseFragment(
-          '<link rel="stylesheet" type="text/css"'
-          ' href="packages/polymer/src/build/log_injector.css">'));
-    }
-  }
-
-  _spanForNode(analyzer.Element context, AstNode node) {
-    var file = resolver.getSourceFile(context);
-    return file.span(node.offset, node.end);
-  }
-}
-
-const MAIN_HEADER = """
-library app_bootstrap;
-
-import 'package:polymer/polymer.dart';
-""";
-
-/// An html visitor that:
-///   * finds all polymer expressions and records the getters and setters that
-///     will be needed to evaluate them at runtime.
-///   * extracts all attributes declared in the `attribute` attributes of
-///     polymer elements.
-class _HtmlExtractor extends TreeVisitor {
-  final Map<String, List<String>> publishedAttributes;
-  final SmokeCodeGenerator generator;
-  final _SubExpressionVisitor expressionVisitor;
-  final BuildLogger logger;
-  bool _inTemplate = false;
-  bool _inPolymerJs = false;
-
-  _HtmlExtractor(this.logger, this.generator, this.publishedAttributes,
-      this.expressionVisitor);
-
-  void visitElement(Element node) {
-    if (_inTemplate) _processNormalElement(node);
-    var lastInPolymerJs = _inPolymerJs;
-    if (node.localName == 'polymer-element') {
-      // Detect Polymer JS elements, the current logic is any element with only
-      // non-Dart script tags.
-      var scripts = node.querySelectorAll('script');
-      _inPolymerJs = scripts.isNotEmpty &&
-          scripts.every((s) => s.attributes['type'] != 'application/dart');
-      _processPolymerElement(node);
-      _processNormalElement(node);
-    }
-
-    if (node.localName == 'template') {
-      var last = _inTemplate;
-      _inTemplate = true;
-      super.visitElement(node);
-      _inTemplate = last;
-    } else {
-      super.visitElement(node);
-    }
-    _inPolymerJs = lastInPolymerJs;
-  }
-
-  void visitText(Text node) {
-    // Nothing here applies if inside a polymer js element
-    if (!_inTemplate || _inPolymerJs) return;
-    var bindings = _Mustaches.parse(node.data);
-    if (bindings == null) return;
-    for (var e in bindings.expressions) {
-      _addExpression(e, false, false, node.sourceSpan);
-    }
-  }
-
-  /// Registers getters and setters for all published attributes.
-  void _processPolymerElement(Element node) {
-    // Nothing here applies if inside a polymer js element
-    if (_inPolymerJs) return;
-
-    var tagName = node.attributes['name'];
-    var value = node.attributes['attributes'];
-    if (value != null) {
-      publishedAttributes[tagName] =
-          value.split(ATTRIBUTES_REGEX).map((a) => a.trim()).toList();
-    }
-  }
-
-  /// Produces warnings for misuses of on-foo event handlers, and for instanting
-  /// custom tags incorrectly.
-  void _processNormalElement(Element node) {
-    // Nothing here applies if inside a polymer js element
-    if (_inPolymerJs) return;
-
-    var tag = node.localName;
-    var isCustomTag = isCustomTagName(tag) || node.attributes['is'] != null;
-
-    // Event handlers only allowed inside polymer-elements
-    node.attributes.forEach((name, value) {
-      var bindings = _Mustaches.parse(value);
-      if (bindings == null) return;
-      var isEvent = false;
-      var isTwoWay = false;
-      if (name is String) {
-        name = name.toLowerCase();
-        isEvent = name.startsWith('on-');
-        isTwoWay = !isEvent &&
-            bindings.isWhole &&
-            (isCustomTag ||
-                tag == 'input' && (name == 'value' || name == 'checked') ||
-                tag == 'select' &&
-                    (name == 'selectedindex' || name == 'value') ||
-                tag == 'textarea' && name == 'value');
-      }
-      for (var exp in bindings.expressions) {
-        _addExpression(exp, isEvent, isTwoWay, node.sourceSpan);
-      }
-    });
-  }
-
-  void _addExpression(
-      String stringExpression, bool inEvent, bool isTwoWay, SourceSpan span) {
-    if (inEvent) {
-      if (stringExpression.startsWith('@')) {
-        logger.warning(AT_EXPRESSION_REMOVED, span: span);
-        return;
-      }
-
-      if (stringExpression == '') return;
-      if (stringExpression.startsWith('_')) {
-        logger.warning(NO_PRIVATE_EVENT_HANDLERS, span: span);
-        return;
-      }
-      generator.addGetter(stringExpression);
-      generator.addSymbol(stringExpression);
-    }
-    expressionVisitor.run(pe.parse(stringExpression), isTwoWay, span);
-  }
-}
-
-/// A polymer-expression visitor that records every getter and setter that will
-/// be needed to evaluate a single expression at runtime.
-class _SubExpressionVisitor extends pe.RecursiveVisitor {
-  final SmokeCodeGenerator generator;
-  final BuildLogger logger;
-  bool _includeSetter;
-  SourceSpan _currentSpan;
-
-  _SubExpressionVisitor(this.generator, this.logger);
-
-  /// Visit [exp], and record getters and setters that are needed in order to
-  /// evaluate it at runtime. [includeSetter] is only true if this expression
-  /// occured in a context where it could be updated, for example in two-way
-  /// bindings such as `<input value={{exp}}>`.
-  void run(pe.Expression exp, bool includeSetter, span) {
-    _currentSpan = span;
-    _includeSetter = includeSetter;
-    visit(exp);
-  }
-
-  /// Adds a getter and symbol for [name], and optionally a setter.
-  _add(String name) {
-    if (name.startsWith('_')) {
-      logger.warning(NO_PRIVATE_SYMBOLS_IN_BINDINGS, span: _currentSpan);
-      return;
-    }
-    generator.addGetter(name);
-    generator.addSymbol(name);
-    if (_includeSetter) generator.addSetter(name);
-  }
-
-  void preVisitExpression(e) {
-    // For two-way bindings the outermost expression may be updated, so we need
-    // both the getter and the setter, but we only need the getter for
-    // subexpressions. We exclude setters as soon as we go deeper in the tree,
-    // except when we see a filter (that can potentially be a two-way
-    // transformer).
-    if (e is pe.BinaryOperator && e.operator == '|') return;
-    _includeSetter = false;
-  }
-
-  visitIdentifier(pe.Identifier e) {
-    if (e.value != 'this') _add(e.value);
-    super.visitIdentifier(e);
-  }
-
-  visitGetter(pe.Getter e) {
-    _add(e.name);
-    super.visitGetter(e);
-  }
-
-  visitInvoke(pe.Invoke e) {
-    _includeSetter = false; // Invoke is only valid as an r-value.
-    if (e.method != null) _add(e.method);
-    super.visitInvoke(e);
-  }
-}
-
-/// Parses and collects information about bindings found in polymer templates.
-class _Mustaches {
-  /// Each expression that appears within `{{...}}` and `[[...]]`.
-  final List<String> expressions;
-
-  /// Whether the whole text returned by [parse] was a single expression.
-  final bool isWhole;
-
-  _Mustaches(this.isWhole, this.expressions);
-
-  static _Mustaches parse(String text) {
-    if (text == null || text.isEmpty) return null;
-    // Use template-binding's parser, but provide a delegate function factory to
-    // save the expressions without parsing them as [PropertyPath]s.
-    var tokens = MustacheTokens.parse(text, (s) => () => s);
-    if (tokens == null) return null;
-    var length = tokens.length;
-    bool isWhole =
-        length == 1 && tokens.getText(length) == '' && tokens.getText(0) == '';
-    var expressions = new List(length);
-    for (int i = 0; i < length; i++) {
-      expressions[i] = tokens.getPrepareBinding(i)();
-    }
-    return new _Mustaches(isWhole, expressions);
-  }
-}
-
-/// Holds types that are used in queries
-class _ResolvedTypes {
-  /// Element representing `HtmlElement`.
-  final ClassElement htmlElementElement;
-
-  /// Element representing `String`.
-  final InterfaceType stringType;
-
-  /// Element representing `Polymer`.
-  final ClassElement polymerClassElement;
-
-  /// Element representing the constructor of `@CustomTag`.
-  final ConstructorElement customTagConstructor;
-
-  /// Element representing the type of `@published`.
-  final ClassElement publishedElement;
-
-  /// Element representing the type of `@observable`.
-  final ClassElement observableElement;
-
-  /// Element representing the type of `@ObserveProperty`.
-  final ClassElement observePropertyElement;
-
-  /// Element representing the type of `@ComputedProperty`.
-  final ClassElement computedPropertyElement;
-
-  /// Logger for reporting errors.
-  static BuildLogger logger;
-
-  factory _ResolvedTypes(Resolver resolver) {
-    var coreLib = resolver.getLibraryByUri(Uri.parse('dart:core'));
-    // coreLib should never be null, its ok to throw if this fails.
-    var stringType = _lookupType(coreLib, 'String').type;
-
-    // Load class elements that are used in queries for codegen.
-    var polymerLib =
-        resolver.getLibrary(new AssetId('polymer', 'lib/polymer.dart'));
-    if (polymerLib == null) {
-      _definitionError('polymer');
-      return new _ResolvedTypes.internal(
-          null, stringType, null, null, null, null, null, null);
-    }
-
-    var htmlLib = resolver.getLibraryByUri(Uri.parse('dart:html'));
-    var observeLib =
-        resolver.getLibrary(new AssetId('observe', 'lib/src/metadata.dart'));
-
-    var customTagConstructor =
-        _lookupType(polymerLib, 'CustomTag').constructors.first;
-    var publishedElement = _lookupType(polymerLib, 'PublishedProperty');
-    var observePropertyElement = _lookupType(polymerLib, 'ObserveProperty');
-    var computedPropertyElement = _lookupType(polymerLib, 'ComputedProperty');
-    var polymerClassElement = _lookupType(polymerLib, 'Polymer');
-    var observableElement = _lookupType(observeLib, 'ObservableProperty');
-    var htmlElementElement = _lookupType(htmlLib, 'HtmlElement');
-
-    return new _ResolvedTypes.internal(htmlElementElement, stringType,
-        polymerClassElement, customTagConstructor, publishedElement,
-        observableElement, observePropertyElement, computedPropertyElement);
-  }
-
-  _ResolvedTypes.internal(this.htmlElementElement, this.stringType,
-      this.polymerClassElement, this.customTagConstructor,
-      this.publishedElement, this.observableElement,
-      this.observePropertyElement, this.computedPropertyElement);
-
-  static _lookupType(LibraryElement lib, String typeName) {
-    var result = lib.getType(typeName);
-    if (result == null) _definitionError(typeName);
-    return result;
-  }
-
-  static _definitionError(name) {
-    var message = MISSING_POLYMER_DART;
-    if (logger != null) {
-      logger.warning(message);
-    } else {
-      throw new StateError(message.snippet);
-    }
-  }
-}
-
-/// Retrieves all classes that are visible if you were to import [lib]. This
-/// includes exported classes from other libraries.
-List<ClassElement> _visibleClassesOf(LibraryElement lib) {
-  var result = [];
-  result.addAll(lib.units.expand((u) => u.types));
-  for (var e in lib.exports) {
-    var exported = e.exportedLibrary.units.expand((u) => u.types).toList();
-    _filter(exported, e.combinators);
-    result.addAll(exported);
-  }
-  return result;
-}
-
-/// Retrieves all top-level methods that are visible if you were to import
-/// [lib]. This includes exported methods from other libraries too.
-List<FunctionElement> _visibleTopLevelMethodsOf(LibraryElement lib) {
-  var result = [];
-  result.addAll(lib.units.expand((u) => u.functions));
-  for (var e in lib.exports) {
-    var exported = e.exportedLibrary.units.expand((u) => u.functions).toList();
-    _filter(exported, e.combinators);
-    result.addAll(exported);
-  }
-  return result;
-}
-
-/// Filters [elements] that come from an export, according to its show/hide
-/// combinators. This modifies [elements] in place.
-void _filter(
-    List<analyzer.Element> elements, List<NamespaceCombinator> combinators) {
-  for (var c in combinators) {
-    if (c is ShowElementCombinator) {
-      var show = c.shownNames.toSet();
-      elements.retainWhere((e) => show.contains(e.displayName));
-    } else if (c is HideElementCombinator) {
-      var hide = c.hiddenNames.toSet();
-      elements.removeWhere((e) => hide.contains(e.displayName));
-    }
-  }
-}