Sort the output (for now just the classes and instance members).

lib/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('../tree/tree.dart');
 #import('../scanner/scannerlib.dart');
 #import('../leg.dart');  // TODO(karlklose): we only need type.
 #import('../util/util.dart');
@@ skipping 78 matching lines @@
     const ElementKind('typedef', ElementCategory.ALIAS);
 
   static final ElementKind STATEMENT =
     const ElementKind('statement', ElementCategory.NONE);
   static final ElementKind LABEL =
     const ElementKind('label', ElementCategory.NONE);
 
   toString() => id;
 }
 
-class Element implements Hashable {
+class Element implements Comparable, Hashable {
   final SourceString name;
   final ElementKind kind;
   final Element enclosingElement;
   Modifiers get modifiers() => null;
 
   Node parseNode(DiagnosticListener listener) {
     listener.cancel("Internal Error: $this.parseNode", token: position());
   }
 
   Type computeType(Compiler compiler) {
@@ skipping 39 matching lines @@
 
   Element(this.name, this.kind, this.enclosingElement) {
     assert(getLibrary() !== null);
   }
 
   // TODO(kasperl): This is a very bad hash code for the element and
   // there's no reason why two elements with the same name should have
   // the same hash code. Replace this with a simple id in the element?
   int hashCode() => name.hashCode();
 
+  /** Two elements are compared first according to their library name, then
+    * by their position in the source. */
+  int compareTo(Element other) {
+    SourceString lib1Name = this.getLibrary().name;
+    SourceString lib2Name = other.getLibrary().name;
+    int libComparison = lib1Name.compareTo(lib2Name);
+    if (libComparison != 0) return libComparison;
+    SourceString compilationUnitName1 = this.getCompilationUnit().name;
+    SourceString compilationUnitName2 = other.getCompilationUnit().name;
+    int compilationUnitComparison =
+        compilationUnitName1.compareTo(compilationUnitName2);
+    if (compilationUnitComparison != 0) return compilationUnitComparison;
+    int charOffset1 = this.position().charOffset;
+    int charOffset2 = other.position().charOffset;
+    return charOffset1.compareTo(charOffset2);
+  }
+
   CompilationUnitElement getCompilationUnit() {
     Element element = this;
     while (element !== null && !element.isCompilationUnit()) {
       element = element.enclosingElement;
     }
     return element;
   }
 
   LibraryElement getLibrary() {
     Element element = this;
@@ skipping 861 matching lines @@
   final Node node;
   Type bound;
   Type type;
   TypeVariableElement(name, Element enclosing, this.node, this.type,
                       [this.bound])
     : super(name, ElementKind.TYPE_VARIABLE, enclosing);
   Type computeType(compiler) => type;
   Node parseNode(compiler) => node;
   toString() => "${enclosingElement.toString()}.${name.slowToString()}";
 }