Hides libraries that should not be documented.

pkg/docgen/lib/docgen.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.
 
 /**
  * **docgen** is a tool for creating machine readable representations of Dart
  * code metadata, including: classes, members, comments and annotations.
  *
  * docgen is run on a `.dart` file or a directory containing `.dart` files.
  *
@@ skipping 259 matching lines @@
 
 /**
  * Returns true if a library name starts with an underscore, and false
  * otherwise.
  *
  * An example that starts with _ is _js_helper.
  * An example that contains ._ is dart._collection.dev
  */
 // This is because LibraryMirror.isPrivate returns `false` all the time.
 bool _isLibraryPrivate(LibraryMirror mirror) {
-  if (mirror.simpleName.startsWith('_') || mirror.simpleName.contains('._')) {
+  var sdkLibrary = LIBRARIES[mirror.simpleName];
+  if (sdkLibrary != null) {
+    return !sdkLibrary.documented;
+  } else if (mirror.simpleName.startsWith('_') || 
+      mirror.simpleName.contains('._')) {
     return true;
   }
   return false;
 }
 
 /**
  * A declaration is private if itself is private, or the owner is private.
  */
 // Issue(12202) - A declaration is public even if it's owner is private.
 bool _isHidden(DeclarationMirror mirror) {
@@ skipping 785 matching lines @@
   String qualifiedName;
   List<String> parameters;
 
   Annotation(this.qualifiedName, this.parameters);
 
   Map toMap() => {
     'name': qualifiedName,
     'parameters': parameters
   };
 }