Testable patch parser.

dart/tests/compiler/dart2js/mock_compiler.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 mock_compiler;
 
 import 'dart:uri';
 
 import '../../../sdk/lib/_internal/compiler/compiler.dart' as api;
 import '../../../sdk/lib/_internal/compiler/implementation/elements/elements.dart';
@@ skipping 153 matching lines @@
    */
   void registerSource(Uri uri, String source) {
     sourceFiles[uri.toString()] = new MockFile(source);
   }
 
   /**
    * Used internally to create a library from a source text. The created library
    * is fixed to export its top-level declarations.
    */
   LibraryElement createLibrary(String name, String source) {
-    Uri uri = new Uri.fromComponents(scheme: "source", path: name);
-    var script = new Script(uri, new MockFile(source));
-    var library = new LibraryElementX(script);
+    var library = createUnparsedLibrary(name, source);
     parseScript(source, library);
     library.setExports(library.localScope.values.toList());
     return library;
   }
 
+  LibraryElement createUnparsedLibrary(String name, String source) {
+    Uri uri = new Uri.fromComponents(scheme: "source", path: name);
+    var script = new Script(uri, new MockFile(source));
+    return new LibraryElementX(script);
+  }
+
   void reportWarning(Node node, var message) {
     warnings.add(new WarningMessage(node, message.message));
   }
 
   void reportError(Node node, var message) {
     if (message is String && message.startsWith("no library name found in")) {
       // TODO(ahe): Fix the MockCompiler to not have this problem.
       return;
     }
     errors.add(new WarningMessage(node, message.message));
@@ skipping 129 matching lines @@
   operator []=(Node node, Element element) {
     map[node] = element;
   }
 
   operator [](Node node) => map[node];
 
   void remove(Node node) {
     map.remove(node);
   }
 }