Internal libraries supported.

sdk/lib/_internal/compiler/implementation/elements/elements.dart

 // Copyright (c) 2012, 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 elements;
 
 import 'dart:uri';
 
 import 'modelx.dart';
 import '../tree/tree.dart';
@@ skipping 452 matching lines @@
 abstract class CompilationUnitElement extends Element {
   Script get script;
   PartOf get partTag;
 
   void addMember(Element element, DiagnosticListener listener);
   void setPartOf(PartOf tag, DiagnosticListener listener);
   bool get hasMembers;
 }
 
 abstract class LibraryElement extends Element implements ScopeContainerElement {
-  Uri get uri;
+  /**
+   * The canonical uri for this library.
+   *
+   * For user libraries the canonical uri is the script uri. For platform
+   * libraries the canonical uri is of the form [:dart:x:].
+   */
+  Uri get canonicalUri;
   CompilationUnitElement get entryCompilationUnit;
   Link<CompilationUnitElement> get compilationUnits;
   Link<LibraryTag> get tags;
   LibraryName get libraryTag;
   Link<Element> get exports;
 
+  /**
+   * [:true:] if this library is part of the platform, that is its canonical
+   * uri has the scheme 'dart'.
+   */
   bool get isPlatformLibrary;
+
+  /**
+   * [:true:] if this library is a platform library whose path starts with
+   * an underscore.
+   */
+  bool get isInternalLibrary;
   bool get canUseNative;
   bool get exportsHandled;
 
   // TODO(kasperl): We should try to get rid of these.
   void set canUseNative(bool value);
   void set libraryTag(LibraryName value);
 
   LibraryElement get implementation;
 
   void addCompilationUnit(CompilationUnitElement element);
@@ skipping 271 matching lines @@
   Element get annotatedElement;
   int get resolutionState;
   Token get beginToken;
 
   // TODO(kasperl): Try to get rid of these.
   void set annotatedElement(Element value);
   void set resolutionState(int value);
 
   MetadataAnnotation ensureResolved(Compiler compiler);
 }