combine script extractor and import inliner

pkg/polymer/lib/src/build/common.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.
 
 /// Common methods used by transfomers.
 library polymer.src.build.common;
 
 import 'dart:async';
 import 'dart:math' show min, max;
 
+import 'package:analyzer/src/generated/ast.dart';
+import 'package:analyzer/src/generated/error.dart';
+import 'package:analyzer/src/generated/parser.dart';
+import 'package:analyzer/src/generated/scanner.dart';
 import 'package:barback/barback.dart';
 import 'package:html5lib/dom.dart' show Document;
 import 'package:html5lib/parser.dart' show HtmlParser;
 import 'package:path/path.dart' as path;
 import 'package:observe/transformer.dart' show ObservableTransformer;
 import 'package:source_maps/span.dart' show Span;
 
 /// Parses an HTML file [contents] and returns a DOM-like tree. Adds emitted
 /// error/warning to [logger].
 Document _parseHtml(String contents, String sourcePath, TransformLogger logger,
@@ skipping 73 matching lines @@
   Future<Document> readAsHtml(AssetId id, Transform transform) {
     var primaryId = transform.primaryInput.id;
     bool samePackage = id.package == primaryId.package;
     var url = spanUrlFor(id, transform);
     return transform.readInputAsString(id).then((content) {
       return _parseHtml(content, url, transform.logger,
         checkDocType: samePackage && options.isHtmlEntryPoint(id));
     });
   }
 
-  /// Gets the appropriate URL to use in a [Span] to produce messages
-  /// (e.g. warnings) for users. This will attempt to format the URL in the most
-  /// useful way:
-  ///
-  /// - If the asset is within the primary package, then use the [id.path],
-  ///   the user will know it is a file from their own code.
-  /// - If the asset is from another package, then use [assetUrlFor], this will
-  ///   likely be a "package:" url to the file in the other package, which is
-  ///   enough for users to identify where the error is.
-  String spanUrlFor(AssetId id, Transform transform) {
-    var primaryId = transform.primaryInput.id;
-    bool samePackage = id.package == primaryId.package;
-    return samePackage ? id.path
-        : assetUrlFor(id, primaryId, transform.logger, allowAssetUrl: true);
-  }
-
   Future<bool> assetExists(AssetId id, Transform transform) =>
       transform.getInput(id).then((_) => true).catchError((_) => false);
 
   String toString() => 'polymer ($runtimeType)';
 }
 
+/// Gets the appropriate URL to use in a [Span] to produce messages
+/// (e.g. warnings) for users. This will attempt to format the URL in the most
+/// useful way:
+///
+/// - If the asset is within the primary package, then use the [id.path],
+///   the user will know it is a file from their own code.
+/// - If the asset is from another package, then use [assetUrlFor], this will
+///   likely be a "package:" url to the file in the other package, which is
+///   enough for users to identify where the error is.
+String spanUrlFor(AssetId id, Transform transform) {
+  var primaryId = transform.primaryInput.id;
+  bool samePackage = id.package == primaryId.package;
+  return samePackage ? id.path
+      : assetUrlFor(id, primaryId, transform.logger, allowAssetUrl: true);
+}
+
 /// Transformer phases which should be applied to the Polymer package.
 List<List<Transformer>> get phasesForPolymer =>
     [[new ObservableTransformer(['lib/src/instance.dart'])]];
 
 /// Create an [AssetId] for a [url] seen in the [source] asset. By default this
 /// is used to resolve relative urls that occur in HTML assets, including
 /// cross-package urls of the form "packages/foo/bar.html". Dart "package:"
 /// urls are not resolved unless [source] is Dart file (has a .dart extension).
 // TODO(sigmund): delete once this is part of barback (dartbug.com/12610)
 AssetId resolve(AssetId source, String url, TransformLogger logger, Span span,
@@ skipping 107 matching lines @@
   return builder.relative(builder.join('/', id.path),
       from: builder.join('/', builder.dirname(sourceId.path)));
 }
 
 
 /// Convert system paths to asset paths (asset paths are posix style).
 String _systemToAssetPath(String assetPath) {
   if (path.Style.platform != path.Style.windows) return assetPath;
   return path.posix.joinAll(path.split(assetPath));
 }
+
+
+/// Parse [code] using analyzer.
+CompilationUnit parseCompilationUnit(String code) {
+  var errorListener = new _ErrorCollector();
+  var reader = new CharSequenceReader(code);
+  var scanner = new Scanner(null, reader, errorListener);
+  var token = scanner.tokenize();
+  var parser = new Parser(null, errorListener);
+  return parser.parseCompilationUnit(token);
+}
+
+class _ErrorCollector extends AnalysisErrorListener {
+  final errors = <AnalysisError>[];
+  onError(error) => errors.add(error);
+}